WO2019189299A1 - Method for preventing scrap rising of scraps - Google Patents

Abstract

[PROBLEM] To provide a simple method for preventing the scrap rising of scraps which makes it possible to prevent the scrap rising of scraps 120 formed around a product, said scraps including outer peripheral sections of a steel sheet.　[SOLUTION] This method for preventing the scrap rising of scraps prevents the scrap rising of the scraps 120 which result when a product 110 is blanked from a steel sheet 10 using a die 20 and a punch 10. The die 20 comprises recesses 21 which form, on the outer peripheral edge part 121 of the scraps 120, projections 122 which project toward the product. The punch 10 comprises protrusions 11 which, together with the recesses, form the projections 122 on the scraps 120. The projections 122 of the scraps 120, formed on the outer peripheral edge part 121 of the scraps toward the product by the protrusions 11 and the recesses 21, are fit within the recesses 21 in the die 20 by the protrusions 11 of the punch.

Description

How to prevent scrap scrap from rising

The present invention relates to a scrap prevention method for scraps.

A punching process in which a product is punched from a steel plate using a die and a punch is known. In this punching process, a product is punched from a steel sheet by a die having a cutting blade on the upper surface and a punch corresponding to the shape of the die cutting blade. By the punching process, a scrap portion that is a remaining portion of the product punched from the steel plate is generated. *

The scrap portion generated by the punching process may move together with the punch when the steel plate is punched by the punch. In other words, so-called scraping may occur during the punching process. *

As a configuration of a die and a punch for preventing the residue from rising, for example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2012-110962) discloses a residue raising prevention die. This dregs rise prevention die has a die edge on the upper surface of the die. By forming a die cutting edge side surface having an inclination angle in the direction toward the punch from the die cutting edge toward the bottom surface of the die, the scrap rising prevention die prevents the scrap from rising.

JP 2012-110962 A

However, when the scrap part is generated around the product part and includes the outer peripheral part of the steel plate, the cutting edge of the die is not formed over the entire periphery of the clap part, so the scrap part is constrained to the side surface of the die edge. Can not do it. *

An object of the present invention is to provide a scrap-up preventing method for scrap parts that can prevent the scrap parts from rising up around the product part and including the outer peripheral part of the steel plate with a simple configuration.

A scrap portion prevention method according to a first aspect of the present invention is a scrap portion that is generated around a product portion when the product portion is punched from a steel plate using a die and a punch and includes an outer peripheral portion of the steel plate. In the method for preventing the residue from rising, the die has a recess that forms a protruding portion projecting toward the product portion when viewed from the punching direction at a peripheral portion on the product portion side of the scrap portion, and the punch Has a convex part that forms the projecting part in the scrap part together with the concave part of the die, and the product part side of the scrap part is formed by the convex part of the punch and the concave part of the die. A stamping step of forming the protruding portion on the peripheral edge, and scrap for fitting the protruding portion of the scrap portion into the recessed portion of the die by the protruding portion of the punch It has a fitting step.

With the above configuration, it is possible to prevent the scrap portion from being raised around the product portion and including the outer peripheral portion of the steel plate with a simple configuration.

FIG. 1 is a cross-sectional view schematically showing a schematic configuration of a press working apparatus provided with a die and a punch used in the method of preventing dregs of the present invention. FIG. 2 is a plan view showing a schematic configuration of a motor core member as an example of a product portion. FIG. 3 is a diagram schematically showing a manufacturing process of a motor core member manufactured from a strip steel plate by punching. FIG. 4 is a diagram schematically showing the shape of the scrap portion removed from the strip steel plate by punching. FIG. 5 is a partially enlarged perspective view schematically showing a configuration of a die for manufacturing a motor core member. FIG. 6 is a partially enlarged plan view schematically showing a configuration of a die and a punch for manufacturing a motor core member. FIG. 7 is a processing flow of punching performed by the press working apparatus of FIG. FIG. 8A is a diagram schematically showing a state of a punch and a die at the time of steel plate alignment in punching performed by the press working apparatus of FIG. FIG. 8B is a diagram schematically showing the state of the punch and the die in the scrap part fitting step in the punching process performed by the press working apparatus of FIG. 1. FIG. 8C is a diagram schematically showing the state of the punch and die at the end of the punching process in the punching process performed by the press working apparatus of FIG. 1. FIG. 9 is a diagram schematically showing a state in which the scrap portion in which the protruding portion is fitted in the concave portion of the die is inclined.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected about the same or an equivalent part in a figure, and the description is not repeated. Moreover, the dimension of the structural member in each figure does not faithfully represent the actual dimension of the structural member, the dimensional ratio of each structural member, or the like. *

In this specification, the “product part” means a product obtained by punching a steel plate with a press working apparatus or the like. The “scrap part” means a part other than the product part removed by punching the product part. *

The product of the present invention is suitably used for a stator of a motor. In the following embodiment, an example in which a strip-shaped steel plate is punched out by a press working apparatus and processed into a product portion as a motor core member will be described, but the same can be used for products used for other purposes. . *

In the following description, the expressions “fixed”, “connected”, “attached”, etc. (hereinafter “fixed”, etc.) are not only used when the members are directly fixed, but also via other members. This includes cases where they are fixed. That is, in the following description, expressions such as fixation include the meanings of direct and indirect fixation between members. *

In the following description, the moving direction of the punch of the press machine is referred to as “vertical direction”, the direction perpendicular to the vertical direction, and the direction along the surface of the steel sheet is referred to as “lateral direction”. *

(Whole structure) FIG. 1: is a perspective view which shows schematic structure of the press work apparatus 1 which concerns on embodiment of this invention. The press processing apparatus 1 forms the core member 110 for motors which is a product part by stamping the strip-shaped steel plate 100. FIG. Specifically, the press working apparatus 1 includes a punch 10 and a die 20 that open and close relatively in the vertical direction. The press working apparatus 1 punches the steel plate 100 positioned on the upper surface of the die 20 with a punch 10. In the present embodiment, the press working apparatus 1 aligns and punches the strip-shaped steel sheet while feeding it in the length direction of the steel sheet, but may punch the steel sheet for each sheet. *

The press working apparatus 1 includes a fixed platen 2 and a movable platen 3. The movable platen 3 is positioned above the fixed platen 2 at a predetermined interval in the vertical direction. The movable platen 3 is movable in the vertical direction, and can be separated from the fixed platen 2. *

A die plate 4 is fixed to the upper surface of the fixed platen 2. The die plate 4 fixes the die 20. *

A punch plate 5 is fixed to the lower surface of the movable platen 3. The punch plate 5 fixes the punch 10. A stripper plate 7 is attached to the lower side of the punch plate 5 via a shoulder bolt 6. The stripper plate 7 can be separated from the punch plate 5. The stripper plate 7 comes into contact with the upper surface of the die plate 4 when the movable platen 3 moves downward during press working. *

The movable platen 3 has guide pins 8 that extend downward through the stripper plate. The die plate 4 has a guide bush 9 into which a guide pin 8 is inserted. The guide pin 8 and the guide bush 9 guide the vertical movement of the movable platen 2. *

The punch 10 has a punch blade edge 10a. The die 20 has a die cutting edge 20a. The punch blade edge 10 a for punching the steel plate 100 by the punch blade edge 10 a and the die blade edge 20 a is located at the lower end of the punch 10. The die cutting edge 20 a is located on the upper surface of the die 20. The punch blade edge 10a and the die blade edge 20a have shapes suitable for punching such as drilling or outline punching when viewed from the vertical direction. *

FIG. 1 shows the configuration of a punch 10 and a die 20 for performing an outline punching process. In the outer shape punching process, a product portion 110 having an outer shape corresponding to the shapes of the punch blade edge 10a of the punch 10 and the die blade edge 20a of the die 20 is formed. In the external punching process, as shown in FIG. 3, when the product portion 110 is punched from the steel plate 100, a scrap portion 120 including the outer peripheral portion 101 of the steel plate 100 is generated outside the product portion 100. *

In the present embodiment, the product section 110 is a motor core member. Hereinafter, the same reference numeral 110 as that of the product portion is also given to the motor core member. *

The motor core member 110 is a member for constituting a stator core of a motor (not shown). That is, the stator core includes a motor core member 110 that is stacked in the thickness direction. Since the configuration of the stator core of the motor is the same as that of the conventional stator core, detailed description thereof is omitted. *

As shown in FIG. 2, the motor core member 110 has an annular shape having a central hole 110a at the center. The motor core member 110 includes an annular yoke portion 41 and a plurality of teeth 42 extending from the radially inner side of the yoke portion 41 toward the radially inner side. The yoke portion 41 has a plurality of through holes 43. The through holes 43 are used for positioning the motor core members 110 in the stacking process of the motor core members 110 when the stator core is manufactured. *

FIG. 3 is a diagram schematically showing how the motor core member 110 is formed from the steel plate 100 by punching. When forming the core member 110 for motors from the steel plate 100, each process of a drilling process, an external punching process, and a cutting process is performed with respect to the steel plate 100 as an example. In addition, FIG. 3 has shown the mode of the process of the steel plate in the case of performing an external punching process with respect to the steel plate 100 in which the drilling process was performed. However, the drilling process may be performed after the outer shape punching process. *

As shown in FIG. 3, in the drilling process, the center hole 110 a is punched out of the steel plate 100, the slots of the teeth 42 are punched out, and the plurality of through holes 43 in the yoke portion 41 are punched out. The drilling process may be performed by a plurality of steps. *

In the outer shape punching step, the outer shape of the motor core member 110 is formed. In the present embodiment, the motor core member 110 obtained by the outer shape punching process has a substantially regular dodecagon. *

In the outer shape punching step, the core member 110 for a motor is formed by punching the strip-shaped steel plate 100. In other words, the steel plate 100 is separated into the motor core member 110 and the scrap portion 120 that is located around the motor core member 110 and includes the outer peripheral portion 101 of the steel plate 100 by the outer shape punching step. *

As shown in FIG. 3, in the present embodiment, in the outer shape punching process, a plurality of notches 112 are formed in the outer peripheral edge 111 of the motor core member 110. In the present embodiment, in the outer shape punching step, the notch 112 is formed at one place on one side of the outer peripheral edge 111 of the motor core member 110. However, the number of notches 112 formed on one side of the outer peripheral edge 111 of the motor core member 110 is not limited to one, and may be plural. *

In the stamping process, the press working apparatus 1 punches the motor core member 110 from the steel plate 100 with the punch 10 and the die 20. Therefore, the notch 112 is formed over the entire thickness direction of the motor core member 110. *

As described above, the scrap portion 120 is formed on the outer peripheral side of the steel plate 100 when the motor core member 110 is punched from the steel plate 100. Therefore, the scrap part 120 has a peripheral part 121 having a shape along the outer periphery of the motor core member 110. As shown in FIG. 4, the peripheral portion 121 of the scrap portion 120 has a plurality of protruding portions 122 that protrude toward the motor core member 110. The plurality of protruding portions 122 are formed on the peripheral edge portion 12 of the scrap portion 12 when the plurality of notches 112 of the motor core member 110 are punched from the steel plate 100. *

As shown in FIG. 4, the protruding portion 122 formed in the scrap portion 120 has an arc shape having a diameter A equal to or larger than the thickness dimension B of the steel plate 100 shown in FIG. 8A. However, the shape and size of the protruding portion 122 are not limited to this.

As described above, the protruding portion 122 is formed on the peripheral edge portion 12 of the scrap portion 120, so that the scrap portion 120 can be prevented from rising in the outer shape punching process. Details of the mechanism by which the scrap rise is prevented by the protruding portion 122 of the scrap portion 120 will be described later. *

As shown in FIG. 3, the plurality of motor core members 110 punched from the steel plate 100 by the external punching process are connected in the longitudinal direction of the steel plate 100. Therefore, the plurality of motor core members 110 connected in the longitudinal direction of the steel plate 100 are cut for each motor core member 110 by the cutting process. Since the cutting process is the same as the cutting process in the conventional press working, detailed description is omitted. *

FIG. 5 is a partially enlarged perspective view schematically showing the configuration of the die 20. FIG. 6 is a partially enlarged plan view schematically showing the configuration of the punch cutting edge 10a of the punch 10 and the die cutting edge 20a of the die 20. *

The outer shape of the motor core member 110 is the shape of the punch 10 for punching and the cutting edges 10a and 20a of the die 20. That is, the punch cutting edge 10 a of the punch 10 and the die cutting edge 20 a of the die 20 are a notch 112 positioned at the outer peripheral edge portion 111 of the motor core member 110 and a protruding portion 122 positioned at the outer peripheral edge 121 of the scrap portion 120. The shape can be formed. *

Specifically, as shown in FIGS. 5 and 6, the die 20 has a recess 21 in a part of the die cutting edge 20a. Moreover, the punch 10 has the convex part 11 which forms the protrusion part 122 of the scrap part 120 with the concave part 21 of the die | dye 20 in a part of punch blade edge | tip 10a. *

The concave portion 21 of the die 20 has a groove shape extending in the vertical direction on the side surface 23. *

In addition, when forming the some protrusion part 122 in the scrap part 120, the die | dye 20 has the some recessed part 21, and the punch 10 has several pieces in the scrap part 120 with the some recessed part 21 of the die | dye 20. A plurality of convex portions 11 forming the projecting portions 122 are provided. *

The punch cutting edge 10a of the punch 10 and the die cutting edge 20a of the die 20 are located on both sides in the thickness direction of the steel plate 100 during punching. As the punch 10 approaches the die 20, the steel plate 100 is punched by the punch blade edge 10a and the die blade edge 20a. At this time, the convex portion 11 of the punch 10 enters the concave portion 21 of the die 20 from above. *

FIG. 7 is a processing flow of punching performed by the press working apparatus 1 according to the present embodiment. 8A to 8C are diagrams schematically showing a punching process performed by the press working apparatus 1. *

First, as shown in FIG. 8A, the belt-shaped steel plate 100 is positioned between the punch 10 of the press working apparatus 1 and the die 20 and at a predetermined position on the upper surface of the die 20 (step S1). Since the alignment of the steel plate 100 with respect to the die 20 is the same as the alignment of the steel plate in the conventional press working apparatus, detailed description is omitted. *

Next, the punch 10 is lowered for punching (step S2). Thereby, the core member 110 for motors is punched from the steel plate 100 by the punch blade edge 10a and the die blade edge 20a (step S3). This process is a punching process. *

As described above, when punching the steel plate 100, the punch blade edge 10 a and the die blade edge 20 a cut the scrap portion 120 when the motor core member 110 is punched from the steel plate 100. At this time, the convex portion 11 of the punch 10 and the concave portion 21 of the die 20 form a protruding portion 122 on the outer peripheral edge 121 of the scrap portion 120. *

Further, when punching the steel plate 100, the punch 10 pushes down the scrap portion 120 cut with respect to the steel plate 100 downward. Therefore, as shown in FIG. 8B, the convex portion 11 of the punch 10 fits the protruding portion 122 of the scrap portion 120 into the concave portion 21 of the die 20 (step S4). This process is a scrap part fitting process. *

The scrap portion 120 in which the protruding portion 122 fits into the concave portion 21 of the die 20 includes the outer peripheral portion 101 of the steel plate 100. Therefore, the scrap part 120 is inclined downward by its own weight in a state where the protruding part 122 is fitted in the concave part 21. That is, the scrap portion 120 is inclined downward with respect to the die 20 with the protruding portion 122 as a fulcrum. When the scrap portion 120 is inclined downward in this manner, the frictional force between the inner surface 22 of the recess 21 and the protruding portion 122 increases due to the thickness of the scrap portion 120. Therefore, the protrusion 122 is held on the inner surface 22 by friction with the inner surface 22 of the recess 21 of the die 20. *

Therefore, as shown in FIG. 8C, when the punch 10 is separated from the die 20 after the punching process of the product part 110 (step S5), the scrap part 120 can be prevented from rising together with the punch 10. That is, the scrap portion 120 is prevented from rising. *

In the punching process of the steel plate when forming the motor core member next time, the scrap portion held by the die 20 in the previous step is pushed by the scrap portion 120 in the next step and moves downward. That is, each time stamping is performed, the scrap portion 120 is held by the die 20, and thus a plurality of scrap portions 120 are held by the die 20. Further, when the number of scrap portions 120 locked to the die 20 reaches a certain number, the scrap portion 120 located on the lower side falls off from the die 20. In order to remove the scrap portion 120 remaining on the die 20, for example, the dimension between the inner surfaces 22 of the recesses 21 of the die 20 may be increased toward the lower side. *

Further, the position and number of the protrusions 122 may be determined in consideration of the inclination of the scrap part 120 as described above. For example, in the plan view of the scrap portion 120, the weight of the region located on both sides of the scrap portion 120 with the projecting portion 122 as the center by the projecting portion 122 being located at the end of the outer peripheral edge portion 121 of the scrap portion 120. Can be unbalanced. Thereby, the inclination angle and direction of the scrap part 120 with respect to the die 20 can be adjusted. Therefore, the force with which the die 20 holds the scrap portion 120 and the number of scrap portions 120 that can be held by the die 20 can be adjusted. *

A plurality of protruding portions 122 may be formed on the peripheral edge 121 of the scrap portion 120. Thereby, since the scrap part 120 can be more reliably fitted with respect to the die | dye 20, the scrap raising of the scrap part 120 can be prevented more reliably. *

As described above, according to the method for preventing the scrap of the scrap portion 120 from rising according to the present embodiment, the peripheral portion 121 on the product portion 110 side of the scrap portion 120 has the protruding portion 122 protruding toward the product portion side. Therefore, when the product part 122 is punched out, the protruding part 122 of the scrap part 120 can be fitted into the concave part 21 of the die 20 by the punch 10. Since the scrap part 120 generated around the product part 110 includes the outer peripheral part 101 of the steel plate 100, the scrap part 120 is inclined with respect to the die 20. For this reason, the protruding portion 122 of the scrap portion 12 is held by friction with the inner surface 22 of the concave portion 21 of the die 20. Therefore, when the punch 10 is separated from the die 20 after the punching process of the product part 110, the scrap part 120 can be prevented from rising together with the punch 10. That is, the scrap part 120 can be prevented from rising. *

In general, when the scrap portion 120 rises, a scrap portion removing mechanism is provided on the punch side for scrap removal. On the other hand, since the scrap part removal mechanism as described above is not required by preventing the scrap part from rising due to the above-described configuration, the number of parts of the punching device can be reduced. *

In addition, this invention is not limited to the said embodiment, It can implement in another various aspect. *

In the embodiment, the motor core member 110 is described as the product portion. However, the product portion is not limited to the motor core member, and can be widely applied to members having a shape in which a scrap portion including an outer peripheral portion of a steel plate is generated in press working. *

Moreover, in the said embodiment, although the scrap part 120 inclines below by using the protruding part 122 as a fulcrum, the inclination direction and inclination angle of the scrap part 120 are not limited to this. As long as the protruding portion of the scrap portion is held in the concave portion of the die, the inclination direction of the scrap portion may be any direction, and the inclination angle of the scrap portion may be any angle. *

As described above, the scrap prevention of the scrap portion 120 is realized by the frictional force between the protruding portion 122 and the inner surface 22 of the concave portion 21 of the die 20. Therefore, the frictional force can be adjusted by the shape of the protrusion 122. As an example, in the present embodiment, the protruding portion is configured in an arc shape having a diameter A larger than the thickness dimension B of the steel plate 100, but is not limited thereto. For example, the shape of the protruding portion may be a quadrangle when viewed from above. *

Furthermore, in the said embodiment, only one protrusion part 122 is formed in the center part of an outer periphery. However, the position and number of the protruding portions 122 can be changed according to the inclination direction and the inclination angle of the scrap portion 120. For example, as shown in FIG. 9, the scrap portion 120 can be inclined in the direction along the side surface 23 of the die 20 by positioning the protruding portion 122 on the end side of the outer peripheral edge 121 of the scrap portion 120.

INDUSTRIAL APPLICABILITY The present invention can be applied to prevent scrap scraps from being scraped in a steel sheet punching process using a die and a punch.

DESCRIPTION OF SYMBOLS 1 Press processing apparatus 2 Fixed platen 3 Movable platen 4 Die plate 5 Punch plate 6 Shoulder bolt 7 Ripper plate 8 Guide pin 9 Guide bush 10 Punch 10a Punch cutting edge 11 Convex part 20 Die cutting edge 21 Concave part 22 Inner surface 23 Side face 41 Yoke part 42 Teeth 43 Reversing gripping part 100 Strip steel plate 101 Outer peripheral part 110 Motor core member (product part) 110a Central hole 111 Outer peripheral edge 112 Notch 120 Scrap part 121 Peripheral part 122 Projecting part

Claims (4)

In a method for preventing the scrap part from rising around the product part when the product part is punched from the steel sheet using a die and a punch, and including the outer peripheral part of the steel sheet, the die is provided in the scrap part. The peripheral part on the product part side has a concave part that forms a projecting part projecting toward the product part side when viewed from the punching direction, and the punch is formed in the scrap part with the concave part of the die. A punching step of forming the projecting portion on a peripheral portion of the scrap portion on the product portion side by the convex portion of the punch and the concave portion of the die; and A scrap part fitting step of fitting the projecting part of the scrap part into the concave part of the die by the convex part. 2. The scrap part scraping prevention method according to claim 1, wherein the die has a plurality of the recesses that form the protrusions on a peripheral part on the product part side of the scrap part, and the punch includes the punch Along with the concave portion of the die, it has a plurality of the convex portions that form the protruding portion in the scrap portion, and in the punching step, a plurality of the protruding portions are provided on a peripheral portion on the product portion side of the scrap portion, A method for preventing scraps from rising in a scrap portion to be formed. The scrap part rise prevention method of Claim 1 or 2 WHEREIN: The said projecting part is the circular arc shape which has a diameter more than the thickness dimension of the said steel plate, The scrap rise prevention method of a scrap part. 4. The scrap part scrap prevention method according to claim 1, wherein the product part is a disk-shaped motor core member having a plurality of teeth arranged in a circumferential direction. How to prevent residue from rising.

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