KR20170103287A - Manufacturing method of solenoid valve seat housing - Google Patents

Abstract

The present invention relates to an ABS solenoid valve seat housing having a size of approximately 2 to 8 mm which can be manufactured through a cold multi-step process, thereby maximizing productivity and particularly improving the illuminance of a ball seat portion during a cold multi- The present invention also relates to a method of manufacturing a solenoid valve seat housing which can satisfy the function of a solenoid valve by allowing the opening / closing ball to contact the ball seat portion of the valve seat housing accurately.
A method for manufacturing a solenoid valve seat housing of the present invention comprises the steps of forming a solenoid valve seat housing having a valve seat formed on one side thereof and an inner diameter hole formed on the other side thereof and having a minute hole passing through the valve seat and the inner diameter hole, Wherein a valve seat formed on one side of a molding material for manufacturing the solenoid valve seat housing is positioned so as to face an end of a piercing molding die pin fixed to the piercing die and the other side of the molding material is pierced by a piercing punch And a piercing step of causing the piercing-forming die pin to penetrate from one side of the molding material toward the other side to form the micro-fine holes.

Description

TECHNICAL FIELD [0001] The present invention relates to a solenoid valve seat housing,

The present invention relates to a method of manufacturing a solenoid valve seat housing, and more particularly, to a method of manufacturing a solenoid valve seat housing for an anti-lock brake system.

The vehicle is essentially equipped with a hydraulic brake system for braking. Recently, various types of systems have been proposed for obtaining a more powerful and stable braking force.

Examples of the hydraulic brake system include an anti-lock brake system (ABS) that prevents slippage of the wheel during braking, a brake traction control system (BTCS: Brake) that prevents slippage of the drive wheels Traction Control System), and an Electronic Stability System (ESC) that stably maintains the driving condition of the vehicle by controlling the brake fluid pressure by combining an anti-lock brake system and traction control.

1, the hydraulic brake system includes a master cylinder 10 that generates a pressure required for braking, and a wheel cylinder 20 that is provided on each wheel FL, FR, RL, RR of the vehicle A low pressure accumulator 70 for temporarily storing the oil, a pump 80 for forcibly pumping the oil temporarily stored in the low pressure accumulator 70, a plurality of solenoid valves 30, 40, 50 and 60 for controlling the braking oil pressure, An orifice 90 for reducing the pressure pulsation of the oil pumped by the pump 80, a solenoid valve 30, 40, 50, 60, and a pump 80 are electrically controlled The solenoid valves 30, 40, 50 and 60, the low-pressure accumulator 70 and the pump 80 are constructed of an aluminum modulator block (not shown) 100), and the electronic device The apparatus includes a coil assembly (not shown) and the circuit board with built-in ECU housing (not shown) of the respective solenoid valves (30, 40, 50, 60) is coupled with the modulator block 100.

The hydraulic brake system as described above is selected in the ABS, TCS, or ESC mode to perform a proper braking operation according to the driving situation of the vehicle.

[0003] On the other hand, since the above-mentioned hydraulic brake system requires safety to be a top priority, each component must be operated accurately according to a predetermined function. Particularly, a valve seat housing of a solenoid valve, So that the function of the valve seat housing can be satisfied.

As a conventional method for manufacturing the valve seat housing, a metal round rod of a material for manufacturing a valve seat housing is turned, then electrolytically processed to improve the roughness, and then subjected to ultrasonic cleaning again. So that the opening and closing ball can be accurately contacted with the ball seat portion.

However, since the conventional method is manufactured through turning, it takes a lot of cost and time to manufacture, and there is a problem that the defects often occur.

Considering the prior art relating to the manufacture of the solenoid valve seat housing provided as means for solving such a problem, Patent Document No. 10-2006-0018068 discloses a method for manufacturing a seat housing of an ibis solenoid valve (Patent Document 1) , Patent No. 10-0780090 entitled " Valve seat processing method of solenoid valve for brake system and its jig system "(Patent document 2) and patent No. 10-0796150" Manufacturing of solenoid valve seat housing for automobile brake with high aspect ratio Method "(Patent Document 3) has been provided.

Examination of the technical contents of Patent Document 1 shows that the seat housing, which is a precision component constituting the ABS solenoid valve, is manufactured through powder injection molding.

That is, various sinterable fine powders such as metals, carbides, and ceramics are mixed with a binder, molded into a certain shape through a conventional injection molding method, and then the binder is removed. Finally, the resultant is sintered at a high temperature, Can be economically produced without post-processing.

Considering the technical contents of Patent Document 2, when a plurality of valve sheets are mounted on the jig system and the ultra-fine particles are repeatedly passed through the ultra-fine particles, the ultra-fine particles pass through the orifices of the valve seat to polish the chamfered surfaces around rough edges. Accordingly, the upper edge and chamfered surface of the valve seat contacting the opening / closing ball are precisely processed, so that the oil passing through the orifice can be surely interrupted.

The alloy powder having an average particle size of about 10 占 퐉 is kneaded with a thermoplastic organic binder and injection-molded, followed by a degreasing step and a sintering step to obtain a product having a high aspect ratio having a relative density of 95% By using a mixed gas containing pure nitrogen or hydrogen gas as a carrier gas at a temperature of 700 to 900 ° C. and performing a subsequent sintering process at 1350 ° C. for a maximum of 120 minutes to obtain a densified Effectively controlling the decarburization phenomenon occurring in the manufacturing process of the final alloy steel sintered product.

In order to improve the roughness of the ball seat portion, the above-described Patent Documents 1 to 3 are subjected to a process of powder injection molding or polishing of the seat portion of the manufactured valve seat housing. The size of the valve seat housing is approximately 2 to 8 Mm, it is difficult to obtain a desired roughness when manufacturing the valve seat housing by the above-described conventional methods.

In addition, various steps are required to manufacture the valve seat housing, which requires excessive manufacturing time, as well as heat energy and time required for heating and firing.

Published Patent No. 10-2006-0018068

Patent No. 10-0780090

Patent No. 10-0796150

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems in the prior art, and it is an object of the present invention to provide an ABS solenoid valve seat housing having a size of approximately 2 to 8 mm through a cold multistage process to maximize productivity, The solenoid valve seat housing can be made to satisfy the function of the solenoid valve so that the opening / closing ball can be brought into contact with the ball seat portion of the valve seat housing precisely by including the step of improving the illuminance of the ball seat portion, Method.

According to an aspect of the present invention, there is provided a method of manufacturing a solenoid valve seat housing, including a valve seat formed on one side of the valve seat, an inner diameter hole formed on the other side of the valve seat, A method of manufacturing a valve seat housing, wherein a valve seat formed on one side of a molding material for manufacturing the solenoid valve seat housing is positioned to face an end of a piercing molding die pin fixed to the piercing die, And the piercing die pin is pierced from one side to the other side of the molding material so that the micro-fine holes are formed by piercing the other side of the molding material with the piercing punch.

Preferably, a piercing guide groove is formed at a center of a valve seat formed on one side of the molding material before the piercing process, and a composite molding process for forming a micro hole forming groove in an inner bottom surface of an inner diameter hole formed on the other side of the molding material And in the piercing step, the end portion of the piercing-forming die pin may pass through the micro-hole forming groove in a state of being seated in the piercing guide groove.

Preferably, before the piercing step, a preforming upsetting step of pressing the workpiece into a preformed upsetting mold to form the preformed workpiece; A preforming forward extrusion process for forming a valve seat forming portion and a valve seat forming portion and a valve seat center groove and an inner diameter hole center groove at the center of the main body portion by pressing the preforming material with a preforming forward extrusion die, ; A composite molding process in which the preformed material is pressed with a complex molding die to form a valve seat and an inner diameter hole; And an outer diameter surface forming step of forming the chamfered portion by pressing the preformed material with an outer diameter chamfering forming die to form the molding material.

Preferably, when the preformed material formed in the complex forming process is transferred to the outer diameter chamfering forming process, one side and the other side of the preformed material are reversed to place the inner diameter holes on the entire surface of the die of the outer diameter chamfering forming die, When the molding material molded in the outer diameter face fitting molding process is transferred to the piercing process, the one side and the other side of the molding material are reversed, and a valve seat formed on one side of the molding material is inserted into the piercing die So as to face the end.

Preferably, before the preforming upsetting process, a material cutting process is performed to cut the wire coil to obtain a material; And a calibration upsetting step of pressing and calibrating the cut surface with the calibration upsetting mold.

As described above, the ABS solenoid valve seat housing for braking the vehicle is manufactured by the cold forging method, thereby providing the effect of satisfying the function of the valve seat housing by satisfying the roughness of the ball seat.

Particularly, in the state that the valve seat formed on one side of the molding material is positioned to face the end of the piercing die pin fixed to the piercing die, the other side of the molding material is pressed with a piercing punch to form a micro hole, It is possible to prevent the generation and breakage of burrs on the seat side and enable the opening and closing balls to be brought into contact with the valve seat accurately.

Further, since the piercing die pin fixed to the piercing die forms a minute hole, the piercing die pin can be prevented from being shaken during molding of the ultra-fine hole, thereby preventing defective molding of the minute hole or breakage of the die pin for piercing Provides a possible effect.

1 is a hydraulic circuit diagram showing a general hydraulic brake system.
FIGS. 2A and 2B are views showing a process of performing a calibration up-setting process through a calibration upsetting mold.
FIGS. 3A and 3B are diagrams illustrating a process of performing a pre-forming up-setting process through a pre-forming upsetting mold.
4A and 4B are diagrams showing a process of preforming a forward extrusion process through a preforming front extrusion die.
5A and 5B are views showing a process of performing a complex molding process through a complex molding die.
6A and 6B are diagrams showing a process of forming an outer diameter surface attachment molding process through an outer diameter surface attachment molding die.
7A and 7B are diagrams illustrating a process of piercing through a piercing mold.

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

A method of manufacturing a solenoid valve seat housing according to an embodiment of the present invention includes periodically interrupting braking hydraulic pressure transmitted from an anti-lock brake system (ABS) for braking a vehicle to a wheel side, The present invention relates to a method of manufacturing a solenoid valve seat housing, which is one of the components of a solenoid valve that can prevent the solenoid valve seat housing.

7B, the valve seat 130 formed on one side of the solenoid valve seat housing 160 is assembled so that the opening and closing ball 170 is seated on the valve seat 130, and the opening and closing ball 170 is mounted on the valve seat 130 The solenoid valve seat housing 160 has a function of periodically opening or closing the flow passage through the fine holes 150 as the seat 160 is seated or spaced from the seat 160. The solenoid valve seat housing 160 has a small size .

The method for manufacturing the solenoid valve seat housing 160 according to an embodiment of the present invention is to form the micro valve apparatus 160 of a small size as described above by a cold forging method using a micro- So that the valve seat 130 of the solenoid valve seat housing 160 on which the opening and closing balls 170 are seated can be satisfactorily molded.

The method for manufacturing the solenoid valve seat housing 160 according to an embodiment of the present invention includes the steps of cutting a material S1, a calibration upsetting process S2, a preforming upsetting process S3, a preforming front extrusion process The valve seat 130 of the solenoid valve seat housing 160 may be formed through such a multi-stage molding process as described above. So that the portion can be well formed.

First, the material cutting step (S1) will be described.

In the material cutting step S1, the material 110 is prepared by cutting a cold heading quality wire (CHQ wire) to a predetermined length.

Specifically, in the material cutting step (S1), when a cold-rolled wire rod wound in a roll state from a material supply unit formed on one side of the former is supplied to the cut-off unit, the cold- Is cut to a predetermined length to prepare the work 110.

The material 110 obtained by cutting in the material cutting step S1 is cut to a length considering the volume of the solenoid valve seat housing 160 to be formed and is used in the material cutting step S1 of the present embodiment The diameter of the wire for cold-pressing is 3.5 mm, and the wire is cut to an appropriate length according to the volume of the solenoid valve seat housing 160 finally formed in consideration of the diameter of the wire for cold-pressing.

On the other hand, as shown in FIG. 2A, the material 110 cut in the material cutting step S1 is irregularly cut without cutting the cutting surface 111 in the cutting process.

Next, the calibration up-setting process S2 will be described.

The calibration upsetting step S2 is a step of aligning the cut surface 111 of the work 110. [

As described above, since the material 110 cut in the material cutting step S1 is irregularly cut without cutting the cut surface 111 in the cutting process, the cut surface 111 is pressed and aligned There is a need to do.

For this purpose, for example, after the material 110 cut by the cutter in the material cutting process S1 is transferred and supplied to the calibration upsetting molds M11 and M12 through the transfer device, As shown in the drawing, after the cut material 110 is placed on the die M11, the cut surface 111 is pressed by the punch M12 so that the calibration surface 112 is formed on both sides of the material 110. [

Next, the preforming upsetting step (S3) will be described.

The preform upsetting step S3 is a step of molding the material 110 so that the diameter of the material 110 becomes close to the diameter of the solenoid valve seat housing 160. [

In detail, in the calibration upsetting step S2, the cut surface 111 of the workpiece 110 is pressed to form the workpiece 110 on which the calibration surface 112 is formed, through the transfer device to the preform upsetting molds M21 and M22 After the material 110 is placed on the die M21 as shown in FIGS. 3A and 3B, the upper portion of the material 110 is pressed by a punch M22 to be preformed The material 120 is formed.

Meanwhile, in the preliminary forming upsetting step S3, the chamfered portions 121 are formed on the upper and lower edges pressed by the preforming upsetting dies M21 and M22 to perform the preforming forward extrusion process. The preformed material 120 can smoothly enter the dies M31 of the molding forward extrusion dies M31 and M32 and the homogeneity of the material can be improved.

Next, the preforming forward extrusion step (S4) will be described.

The preforming forward extrusion step S4 is a step of forming the preformed material 120 so as to have a multi-end shape in the valve seat forming part 122 and the main body part 124. [

Specifically, the preformed workpiece 120 formed through the preforming upsetting step S3 is transferred and supplied to the preforming forward extrusion dies M31 and M32 through the transfer device, The preformed workpiece 120 is placed on the die M31 and then the upper portion of the preformed workpiece 120 is pressed by the punch M32 so that the preformed workpiece 120 is pressed against the valve sheet forming portion 122 and a main body part 124. As shown in FIG.

On the other hand, in the preforming front extrusion step S4, the valve seat center groove 123 for forming the valve seat 130 at the correct position is formed at the center of the valve seat forming portion 122, 124 are formed at the center thereof by punching.

Next, the complex molding step (S5) will be described.

In the composite molding step S5, a valve seat 130, which is in contact with the opening and closing ball 170, is concavely formed at the center of the valve seat forming part 122, and at the center of the body part 124, Holes 140 are formed.

5A and 5B, after the preformed material 120 formed through the preforming forward extrusion step S4 is transferred and fed to the composite forming dies M41 and M42 through a transfer device, The preformed workpiece 120 is placed on the die M41 and then the upper portion of the preformed workpiece 120 is pressed by the punch M42 to form the valve sheet forming portion 122 by the die M41, A valve seat 130 is formed in the center lower portion of the body portion 124 to contact the opening and closing ball 170 and the inner diameter hole 140 is formed in the center of the body portion 124 by the punch M42.

In the composite molding step S5, a piercing guide groove 131 is formed at the center of the recessed valve seat 130 for smoothly forming the micro-fine holes 150, The inclined guide portion 141 and the ultra fine hole forming groove 142 are formed on the bottom surface so that the partition wall 127 having a small thickness is formed.

In the composite molding step S5, a curved surface 126 is formed on the outer surfaces of the valve sheet forming portion 122 and the main body portion 124. [

The valve seat 130 and the piercing guide groove 131 are formed in the lower part of the preformed material 120 through the composite molding step S5 as described above, 140, an inclined guide portion 141, and a fine hole forming groove 142 are formed.

Particularly, since the valve seat 130 is formed through the cold forging process in which the preformed material 120 is placed on the dies M41 and then pressed and molded by the punch M42, The roughness is approximately Ry (maximum roughness roughness, difference between peak and lowest point) is 2.0.

Specifically, since the roughness of the molded article formed through the cold forging process is determined in accordance with the surface roughness of the inside of the mold for molding the molded article, if the inner surface roughness of the composite formed mold is made less than approximately Ry2.0, The surface roughness of the preformed material 120 after the step S5 can also be a level lower than Ry 2.0.

Therefore, it is preferable that the inner surface roughness of the complex molding die, especially the die M41, proceeding in the composite molding step (S5) has a surface roughness of less than about Ry2.0.

Next, the outer diameter face fitting forming step (S6) will be described.

The outer diameter face fitting forming step is a step of forming a chamfered portion 143 at an edge of the body portion 124.

Specifically, the preformed material 120 obtained in the complex molding step S5 is transferred and supplied to the outer diameter surface forming molds M51 and M52 through a transfer device. As shown in FIGS. 6A and 6B, The upper and lower portions of the preformed material 120 are reversed so that the inner diameter hole 140 of the body portion 124 is seated on the die M51 and the end portion of the valve seat forming portion 122 is punched M52 so that the chamfered portion 143 is formed on the side portion of the body portion 124 where the inner diameter hole 140 is located.

Assembly characteristics of the solenoid valve seat housing 160 that has been manufactured by the above-described chamfered portion 143 are improved.

Next, the piercing step (S7) will be described.

The piercing process S7 is a process for forming a micro-fine hole 150 passing through the valve seat 130 and the inner diameter hole 140.

Specifically, the preforming material 120 obtained in the outer diameter face fitting forming step S6 is transferred and supplied to the piercing dies M61 and M62 through a transfer device. As shown in FIGS. 7A and 7B, The valve sheet 130 formed on the preforming material 120 is pierced by the piercing dies M61 and the valve seat forming part 122 is rotated so that the upper and lower sides of the molding material 120 are reversed again, Is positioned so as to face the end of the piercing-forming die pin (M61-P) provided in the die (M61).

In this state, as the end of the body portion 124 is pressed by the punch M62, the preforming material 120 is pushed downward by the punch M62 and moves while the piercing die pin M61- So that the ultra fine holes 150 are formed through the molding material 110 from the bottom to the top.

More specifically, the end of the piercing molding die pin M61-P passes through the fine hole forming groove 142 while being seated in the piercing guide groove 131, Holes 130 are formed through the micro holes 150 and burrs or breakage phenomena generated in the piercing process are generated only on the inner side of the micro holes 150. The valve seats 130 and the micro- The warp guide portion 141 is hardly affected by the occurrence or burr of the burr.

At this time, the diameter of the ultra-fine hole 150 penetrated by the piercing molding die pin M61-P is formed to be a very small diameter of about 0.1 mm to 1 mm, and a piercing The extremely fine hole forming groove 142 formed in the guide groove 131 and the inner diameter hole 140 guides the piercing die pin M61-P so that the molding operation of the extremely small hole 150 having a very small diameter can be performed without fail .

As described above, the end of the piercing-forming die pin M61-P is seated in the piercing guide groove 131 and passes through the micro-hole forming groove 142, 150 can be formed on the side of the valve seat 130 to prevent the occurrence of burrs or breakage due to the hole forming of the piercing molding die pin M61-P.

That is, even if burrs are partially generated or broken due to the hole forming of the piercing molding die pin M61-P, the generated position is not the valve seat 130 side but the inner diameter hole 140 side Therefore, the deformation and the surface roughness of the valve seat 130 can be maintained unchanged.

In the case where the pin for molding the ultra-fine hole 150 is provided on the punch side, the pin may be shaken due to movement of the punch during the movement and pressing, However, if the preformed workpiece 120 is punched to form the micro-fine holes 150 in such a state that the fin forming the microfine hole 150 is fixed to the die side, if the pin is wobbled or damaged It is possible to form the fine holes 150 at the correct positions.

Therefore, it is possible to maintain a good shape of the valve seat 130 even after the piercing step S7, and to ensure that the opening and closing ball 170 can accurately contact with the valve seat 130, So that the housing 160 can be manufactured.

Although the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings, it will be apparent to those skilled in the art that many other obvious modifications can be made therein without departing from the scope of the invention. Accordingly, the scope of the present invention should be interpreted by the appended claims to cover many such variations.

110: Material 111:
112: calibration surface 120: preformed material
121: face fitting part 122: valve seat forming part
123: valve seat center groove 124:
125: inner diameter hole center groove 126: curved surface
127: partition 130: valve seat
131: Pierce guide groove 140: Inner diameter hole
141: inclined guide portion 142: micro hole forming groove
143: Face mounting part 150: Ultra fine hole
160: Housing of valve seat

Claims (5)

A method of manufacturing a solenoid valve seat housing in which a valve seat is formed on one side and an inner diameter hole is formed on the other side, and a fine hole passing through the valve seat and the inner diameter hole is formed,
A valve seat formed on one side of a molding material for manufacturing the solenoid valve seat housing is positioned so as to face an end of a piercing molding die pin fixed to the piercing die and the other side of the molding material is pressed by a piercing punch And a piercing step of causing the piercing-forming die pin to penetrate from one side of the molding material toward the other side to form the micro-fine holes. The method according to claim 1,
Prior to the piercing process,
Further comprising a compound forming step of forming a piercing guide groove in the center of a valve seat formed on one side of the molding material and forming a micro hole forming groove in an inner bottom surface of an inner diameter hole formed on the other side of the molding material,
In the piercing process,
And the end portion of the piercing molding die pin passes through the fine hole forming groove in a state where the end portion of the piercing forming die pin is seated in the piercing guide groove. The method according to claim 1,
Prior to the piercing process,
A preform upsetting step of forming a preformed material by pressurizing the material with a preform upsetting mold;
A preforming forward extrusion process for forming a valve seat forming portion and a valve seat forming portion and a valve seat center groove and an inner diameter hole center groove at the center of the main body portion by pressing the preforming material with a preforming forward extrusion die, ;
A composite molding process in which the preformed material is pressed with a complex molding die to form a valve seat and an inner diameter hole; And
And forming a chamfered portion by pressing the preformed material with an outer diameter chamfered forming die to mold the molded workpiece. The method of manufacturing a solenoid valve seat housing according to claim 1, further comprising: The method of claim 3,
When the preformed material formed in the complex forming process is transferred to the outer diameter chamfering forming process, one side and the other side of the preformed material are reversed so that the inner diameter holes are positioned on the front face of the die of the outer diameter chamfering forming die,
Wherein when the molding material molded in the outer diameter face fitting molding step is transferred to the piercing step, the one side and the other side of the molding material are reversed again so that a valve seat formed on one side of the molding material is inserted into the piercing die pin Wherein the valve seat is positioned so as to face an end of the solenoid valve seat housing. The method of claim 3,
Prior to the preform upsetting process,
A material cutting process for cutting a wire coil to obtain a material; And
Further comprising: a calibration upsetting step of pressing and calibrating the cut surface of the workpiece with a calibration upsetting mold.

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