JPH0463602A - Cutting device for ring body - Google Patents

Abstract

PURPOSE:To high-precisely cut an annular work, having low rigidity, without deformation by reducing the resultant force of cutting torque through rotation of tools, attached to inner and outer ring bodies, in a reverse direction to each other. CONSTITUTION:Cutting devices 1 and 1' are arranged facing the front and rear surfaces of first and second catching mechanism parts 3 and 4 selectively supporting the front and the rear of the outer peripheral surface of a ring body 2 with the progress of a cutting process. A plurality of sets of tools 5A, 5'A; 5B, 5'B to cut the inner peripheral surface of a work, a tool 6 to cut the outer peripheral surface of the work, and tools 7 and 7' to cut the front and rear sides of the work are provided. Inner and outer ring bodies 8 and 9 rotatable in an opposite direction to that of the ring body 2 and longitudinally movable are provided. The inner ring body 8 is rotated in, for example, a semiclockwise, and the outer and inner ring bodies 9 and 8 are rotated clockwise in a reverse direction to each other. The tool exerts rotation torque in a reverse direction to each other on the ring body 2 and the resultant force of cutting torque is offset and sharply reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to automobile tire rims, outer rings of rolling bearings, high-pressure tower tanks, gears, flanges, etc., which have a thin wall thickness compared to the diameter or a cross section. The present invention relates to a ring-shaped cutting device suitable for cutting a workpiece formed with a small area.

[Conventional technology]

Conventionally, in the production of ring bodies such as automobile tire rims, outer rings of rolling bearings, high pressure tower tanks, internal or external gears, flanges, etc., a base material (work) made of annular steel is processed using cutting methods such as lace processing. There was something to be produced.

In this case, the ring is supported and fixed using a chuck, and then the tool is rotated relative to the workpiece to cut the ring to reduce its thickness or to form steps or curved surfaces. He was cutting his body.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional cutting devices, when the steel material used as the workpiece has a thin wall thickness compared to the diameter size or a small cross-sectional area, the rigidity of the workpiece may be reduced. Since the workpiece is deformed during machining due to the holding force of the chuck, highly accurate machining may not be possible.

For this reason, conventionally, there has been a demand from a manufacturing perspective that the amount of cut into the work by the tool and the amount of feed of the tool must be kept as modest as possible, resulting in inefficient cutting operations.

[Means to solve the problem]

The present invention has been made in view of the above points, and includes first and second chucking mechanisms that selectively support the front and rear sides of the outer circumferential surface of a ring-shaped workpiece, and a The tool comprises an inner ring body and an outer ring body which are provided to be freely rotatable in the direction, and a tool which is provided to the inner ring body and the outer ring body so as to be freely movable in the radial direction and cuts the inner and outer circumferential surfaces and side surfaces of the workpiece. By applying rotational torques in opposite directions to the workpiece, they cancel each other out and reduce the resultant force of the cutting torques.

[For production]

The workpiece is supported and fixed at the front and rear sides of the outer peripheral surface by the first chucking mechanism section, thereby positioning the workpiece at approximately the center position.

The inner peripheral surface of the workpiece is cut by rotating the inner ring body and the outer ring body having radially movable tools in opposite directions relative to the workpiece.

Thereafter, the outer periphery of the workpiece is supported and fixed by the second chunking mechanism, and the tool is sequentially cut from the opposite side of the outer periphery.

At this time, since the inner ring body and the outer ring body rotate in opposite directions, rotational torque in the opposite direction is applied, so the tools used to cut the outer and inner circumferential sides of the workpiece cancel each other out. The resultant torque is reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1.1' is a cutting device section for cutting a ring-shaped ring body 2 made of steel as a workpiece, and this cutting device section 1.1' is used for cutting the front and rear of the outer peripheral surface of the ring body 2. The first and second chucking mechanisms 3.4 are disposed opposite to each other on the front and rear surfaces of the chucking mechanisms 3 and 4, which selectively support the movement of the chucking mechanism.

The cutting device parts 1 and 1' include tools 5 that are movable and are substantially opposed to each other in the radial direction and are used to cut the inner circumferential surface of the workpiece.
Several sets of A, 5'A; 5B, 5'B, a tool 6 for cutting the outer circumferential surface of the workpiece, and tools 7, 7' for cutting the front and rear sides of the workpiece are provided; an inner ring body 8 that is rotatable in opposite directions (clockwise and counterclockwise) with respect to the ring body 2, and further movable forward and backward in the longitudinal direction (axial direction) with respect to the ring body 2 in FIG.
It is formed of an outer ring body 9, and the chucking mechanism section 3.4 for supporting and fixing the ring body 2 as a workpiece.

The means for making the inner ring body 8 rotatable is a motor as a drive source provided on a movable base 11 that is movable back and forth on a guide rail 10°10 installed with respect to a horizontal floor surface. M, a drive gear 12 mounted on the motor shaft m1 of the motor M1, and the drive gear 12
a passive gear 13 rotatably supported on the moving base 11; a cylindrical portion 15a attached to the center hole of the passive gear 13 with a key 14; External gear body 1 that can freely rotate clockwise
5b.

Reference numeral 16 designates a planetary gear as a power transmission component for receiving the rotation of the inner ring body 8 from the outer gear body 15b and transmitting the rotation to the outer ring body 9. This planet gear 16 stands on the movable base 11. Several bearing support parts 18 are installed on the support plate 17 provided at appropriate angles so as to be able to mesh with the external gear body 15b of the inner ring body 8. It can freely rotate around the body 15b while engaging with it.

Reference numeral 19 denotes a mounting support plate that is attached to the front surface of the bearing support component 18 using bolts 20 in order to rotatably attach the planetary gear 16 to the bearing support component 1.

21.21' is the inner ring body 8, 8 of the cutting device section 1, 1'.
A plurality of the tools 5A are provided at appropriate equal angles so as to cut the inner peripheral surface of the workpiece from the front and the rear respectively during the cutting process.

The tool units 21 and 21' have cylinders 22 and 23 as driving sources, and cylinder rods 22a and 23a of the cylinders 22 and 23. Central apex portion 24a
, 25a are pivotally connected by a shaft 26, and a front arm portion 24b of the swinging arms 24.25.
, 25b! The push rollers 27 and 27 attached thereto are biased via tension springs 28, and the tips of the tools 5A and 5 are
It is formed from tool mounting rods 29 and 30 to which 'A' is attached. The rear ends of the tool mounting rods 29 and 30 are pivotally connected to mounting portions 31 protruding from the front surfaces of the inner rings 8 and 8, respectively, using shafts 32.

Reference numeral 33 designates a tool unit that allows the tools 5B and 5'B to move freely in the radial direction in order to cut the inner peripheral surface of the workpiece, and this tool unit 33 includes a motor M2 as a drive source and a Motor shaft m2 of motor M2
The cylindrical portion 15a is connected to the cylindrical portion 15a by a coupling 34.
A connecting shaft 36 is rotatably inserted into the interior via several bearings 35, 35, and has a bevel gear portion 36a at its tip.
A bevel gear part 37a is provided at the tip (upper end) of the bevel gear part 37a, which is disposed substantially intersectingly so as to mesh with the bevel gear part 36a. a substantially cylindrical relay gear 37 which is rotatably housed via a hair ring 39 and has a threaded portion 37b on its inner periphery;
The tool 5B is attached to the tip.

5B' is attached, and a lifting rod 40 is formed in the lower half thereof with a threaded portion 40a that is screwed into the threaded portion 37b of the relay gear 37.

Reference numeral 41 denotes a support plate for supporting the lifting rod 40 on the front surface of the inner ring body 6 so as to be able to move up and down.

Reference numeral 42 designates a tool unit provided on the front surface of the outer ring body 9 in order to allow the tool 6 to move freely in a radial direction that substantially coincides with and opposes the tool 5'A.
Similar to the tool unit 21', reference numeral 2 includes a hydraulic cylinder 43 as a driving source, and a swinging member having a substantially central apex 44a pivotally attached to a cylinder rod 43a of the cylinder 43 by a shaft 44b. moving arm 44 and swinging arm 44
A tool mounting rod 46 is formed on the front arm portion 44c side of the tool mounting rod 46, which is biased by a tension spring 45 and to which the tool 6 is detachably mounted. The rear end of the tool mounting rod 46 is attached to a mounting portion 48 protruding from the front surface of the outer wheel body 9 using a shaft 47 so that the tool mounting rod 46 can be raised and lowered freely against the urging force of the tension spring 45. It is pivoted.

A plurality of tools 50 are movably provided on the front surface of the inner ring bodies 8, 8 in order to make the tools 7, 7' movable in the radial direction so as to cut the front and rear side surfaces of the ring body 2 as a workpiece. This is a tool unit for side cutting, and this tool unit) 50.50 has a cylinder 51 as a drive source, for example.
and a rail material 52 provided on the front surface of the inner ring body 8 so as to have rail grooves 52a on the left and right sides, and the rail material 5.
The holding vanes 53a, 53a are slidably fitted into the rail grooves 52a, 52a of the rail grooves 52a, 52a, and are driven by the cylinder 51, and the tools 7, 7' are attached to the tips thereof. It is formed from a carrier 53.

Further, as a means for making the movable base 11 freely movable back and forth, a motor M3 as a drive source and a motor shaft m3 of the eight motor M3 are rotatably connected to the motor shaft m3 through a coupling C, and the outer circumferential a connecting shaft 54 having a threaded portion 54a; and the threaded portion 54a of the connecting shaft 54.
A threaded portion 55a that is screwed into the movable base 11 is provided on the inner periphery thereof, and the nut material 55 is fixed to the movable base 11.

The chucking mechanisms 3 and 4 also move the front outer circumferential surface or the rear outer circumferential surface of the ring body 2 as a workpiece on the front outer circumferences of the inner ring body 8 and the outer ring body 9 as the cutting process by the tool 6 progresses. A motor M4 as a drive source is mounted in a centripetal direction by a frame (not shown) so as to selectively support it at several locations by changing its support position.
A threaded portion 56 formed on the outer periphery of the motor shaft m4 of the motor M4 and a female threaded portion 57a to be screwed into the threaded portion 56 are provided on the inner periphery, and a workpiece to be machined is provided on the left and right outer sides. The chuck claw 5 has several steps 57b to support the ring body 2 according to its diameter.
7.

An embodiment of the present invention has the above-described configuration, and the case where the ring body 2 as a workpiece is cut and processed will be described below.

First, as shown in FIG.
When the motor M4 of the chucking mechanism section 3 is driven,
The chuck claw 57, which has a female threaded portion 57a screwed into a threaded portion 56 provided on the outer periphery of the motor shaft m4, moves radially toward the center and moves several times in front of the outer peripheral surface of the ring body 2 as a workpiece. Support in certain areas.

In this way, the ring body 2 as a workpiece is supported at several points in front of its outer peripheral surface by the first chucking mechanism part 3, and is centered with respect to the left and right cutting device parts l and 1', and during machining. positioning is performed.

When the motor M+ rotates and drives, its rotational force is transmitted to the passive gear 13 via the drive gear 12, and the inner ring body 8 of the cutting device parts 1, 1' rotates, for example, in a counterclockwise direction. Furthermore, the outer ring body 9 rotates clockwise in opposition to the inner ring body 8 via several planetary gears 16 meshing with the outer gear body 15b of the inner ring body 8.

After that, one method is to rotate the connecting shaft 36 by rotating the motor M2 of either the cutting device section 1 or 1', so that the connecting shaft 36 is engaged with the bevel gear section 36a provided at the tip of the connecting shaft 36. As the relay gear 37 having the bevel gear portion 37a rotates, the relay gear 37
The lifting rod 40 has a threaded part 40a on its outer periphery that engages with a threaded part 37b provided on the inner periphery of the ring body 2, which is supported on the outer periphery and the front by the first chucking mechanism part 3. is moved in the radial direction according to the

Moreover, as the movable base 11 screwed into the threaded portion 54a moves forward due to the rotation of the connecting shaft 54 of the motor M, the inner periphery of the ring body 2 is moved from the front to the rear using the tool 5B or the tool 5'B. Or cut from the back to the front.

Another method for cutting the inner circumferential surface of the workpiece is to use either tool unit 21.2 of the cutting device section l or 1'.
When the cylinder rods 22a, 23a are extended by driving the cylinders 22, 23 of 1', the respective cylinder rods 22a.

Front arm portions 24b, 25b of a swinging arm 24.25, to which apex portions 24a, 25a are pivotally mounted via a shaft 26;
The side of the tool mounting rod 29, 3 resists the tensile force of the tension spring 28.
The movable base 11 having the nut material 55 screwed into the threaded portion 54a is moved by pressing the tip side of the 0 in the radial direction by the pressing roller 27 and rotating the connecting shaft 54 by the rotation of the motor M3. After the ring body 2 is moved forward, the inner circumferential surface of the ring body 2 is cut by either the tool 5A or 5'A.

Furthermore, when cutting the outer peripheral surface of the workpiece, the tip side of the swinging arm 44 whose apex portion 44a is pivotally connected to the cylinder rod 43a of the cylinder 43 of the tool unit 42 of the cutting device section 1 by a shaft 44b is pulled. The tip side of the tool mounting rod 46 is pressed against the tensile force of the spring 45, and is moved counterclockwise (radially) toward the center by a roller, and the movable base 11 is moved forward by the drive of the motor M3. Therefore, the outer circumferential surface of the ring body 2 whose outer circumference and front surface are supported by the first chucking mechanism section 3 as described above is cut from the rear toward the front as shown in FIG.

In addition, since the cylinder rod is moved forward by driving the cylinder 51 as a driving source, the tool 7' attached to the tip of the cylinder rod is used to move the first chunking mechanism 3 to the front outer circumferential surface as shown in FIG. The rear outer surface of the ring body 2 on which it is supported is cut and chamfered.

At this time, tools 5A and 5 for different purposes for cutting the inner and outer circumferential surfaces are attached to the inner ring body 8 and the outer ring body 9, which rotate in opposite directions, clockwise and half-hourly, so as to be substantially opposite to each other, respectively.
'A; 5B, 5'B; 6 or side cutting tool 7
' apply rotational torques in opposite directions to the ring body 2 as a workpiece, so the resultant force of the cutting torques cancels out and is significantly reduced.

Therefore, as described above, even if the holding force of the chuck claws 57 of the chucking mechanism section 3 on the ring body 2 is weak, the tools 5A, 5'A; 5B, 5'B;
; By increasing the feed rate of 7' and increasing the depth of cut, efficient cutting can be performed.

Also tools 5A, 5'A; 5B, 5'B;6;7'
If they are provided substantially facing each other as in this embodiment, even if centrifugal force acts, the ring body 2 as a workpiece can be cut and processed in a well-balanced manner from the inner circumference and the outer circumference (the first (see Figures and Figure 2).

In this case, the tools 5A are located on the inner and outer peripheries.

By increasing the number of sets of 5'A, 5B, 5'B;6;7' installed, it is possible to cut the ring body 2 as a workpiece in response to differences in material characteristics, shape, thickness, etc. It can be done even more efficiently.

After cutting and processing the inner and outer peripheries and outer surfaces of the ring body 2 while leaving the supported portion of the outer circumferential surface by the first chucking mechanism 3, the rotation of the motor M1 is stopped and the inner ring body 8 and The rotation of the outer ring body 9 is stopped. Thereafter, the motor M2 is rotated in the opposite direction, and the cylinders 22, 23i43 of the respective tool units 1-21, 21' and 42 are rotated.
is driven in the opposite direction, and the tools 5A, 5'A; 5B, 5' B
, 6°; 7' in the direction away from the workpiece.

After that, the motor M4 is reversed, and this motor shaft m
4 is reversed, and the first chuck claw 57 having a female threaded portion 57a that is screwed into a threaded portion 56 formed on the outer periphery is moved in the radial direction to release the support of the chuck claw 57 from the workpiece.

Then, by rotating and driving the motor shaft m4 of the motor M4 again, the first chunking mechanism section 3 having the female screw section 57a to which the screw section 56 is screwed is opened.
By moving the chuck claws 57 of the second chucking mechanism section 4 in the radial direction toward the center, the outer circumference of the ring body 2 as a workpiece is Support the rear part in several places. Similarly, by driving the cylinder rod 43a of the cylinder 43 and rotating the tip side of the swinging arm 44 in the direction of the half-hour hand in FIG. The remaining portion of the outer periphery and tip side of the workpiece (a portion having a width corresponding to the portion supported by the chuck claws 57 of the first chucking mechanism portion 3) is cut by elastically coming into contact with the workpiece.

By simultaneously driving the cylinder 51, the cylinder
By driving the tool 7 attached to the tip of the rod in the radial direction, the front side surface of the ring body 21 as a workpiece is cut and chamfered.

Thereafter, the motor M3 of the cutting device parts 1, 1' is reversely rotated to rotate the connecting shaft 54 in the opposite direction, and the screw portion 55a screwed into the screw portion 54a of the connecting shaft 54 is rotated in the opposite direction.
After moving the movable base 11 backward through the nut material 55 having The ring body 2 is lifted and transported to a predetermined location to obtain a desired product.

In the above embodiment, tools 5A, 5'A; 5By
5'B; The inner ring body 8 to which 7 and 7' are attached and the outer ring body 9 to which the tool 6 is attached are provided with gear parts, and several planetary gears 16 meshing with these gear parts are used to connect the inner ring body. Although the inner ring body 8 and the outer ring body 9 are rotated in opposite directions, it is not necessary to use the planetary gear 16 as a means for rotating the inner ring body 8 and the outer ring body 9 in opposite directions. It is also possible to use other power transmission parts, such as, for example, to rotate and drive the motors in opposite directions by respective dedicated motors. Also tools 5A, 5'A; 5B, 5'B
;7;The mounting position and the number of mounting parts of 7' are not limited to those in the above embodiment.

〔Effect of the invention〕

As described above, the present invention rotates the tools attached to the inner ring body and the outer ring body in opposite directions.
Apply rotational torque in opposite directions to the tool to cancel each other out,
Since the resultant force of cutting torque can be reduced, it is possible to perform high-precision workpieces with low rigidity, such as those with thin wall thickness or small cross-sectional area, without deforming them by increasing the holding force of the chuck. Can be cut and processed.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a cutting device of the present invention, and FIG. 2 is a front view of a cutting device section constituting this embodiment. 1.1'... Cutting device section, 2... Ring body, 3...
・First chucking mechanism section, 4...Second chucking mechanism section, 5A, 5'A; 5B, 5'B,;6
;7゜7′...Tool, butt...Inner ring body, 9...Outer ring body.

Claims (3)

[Claims] (1) First and second chucking mechanisms that selectively support the front and rear sides of the outer peripheral surface of a ring-shaped workpiece; an inner ring body that is rotatably provided in opposite directions with respect to the workpiece; It consists of an outer ring body and a plurality of tools that are provided on the inner ring body and the outer ring body so as to be movable in the radial direction and cut the inner and outer peripheral surfaces and side surfaces of the workpiece, respectively, and the tools are moved in the opposite direction with respect to the workpiece. A cutting device for a ring body, characterized in that the resultant force of the cutting torques is reduced by applying rotational torques that cancel each other out. (2) The inner ring body and the outer ring body are arranged opposite to each other so as to be rotatable before and after the first and second chucking mechanism parts, and the inner and outer circumferential surfaces and side surfaces of the workpiece are arranged between the inner ring body and the outer ring body. 2. The ring body cutting device according to claim 1, wherein the plurality of tools for cutting each are provided so as to be movable in a radial direction. (3) The tool for cutting the inner and outer circumferences of a workpiece includes a cylinder as a driving source, a swinging arm whose approximately central apex portion is swingably attached to the cylinder rod of the cylinder, and The ring body according to claim 1, wherein the ring body is detachably attached to the tool attachment rod of a tool unit comprising a tool attachment rod biased by a tension spring on the front arm side of the swinging arm. cutting equipment.