KR20100114678A

KR20100114678A - Manufacturing system for inner race of a constant velocity joint for a vehicle

Info

Publication number: KR20100114678A
Application number: KR1020090033180A
Authority: KR
Inventors: 심인섭; 아키라 야마모토
Original assignee: 주식회사 나래코퍼레이션
Priority date: 2009-04-16
Filing date: 2009-04-16
Publication date: 2010-10-26

Abstract

PURPOSE: An apparatus and a method for manufacturing an inner race of a constant velocity joint for a vehicle are provided to prevent burr being formed on a recessed surface of a forged material caused by a gap between upper and lower molds. CONSTITUTION: An apparatus for manufacturing an inner race of a constant velocity joint for a vehicle comprises a support assembly(100), a press assembly(200), and a plurality of segment assemblies(300). The support assembly supports the lower part of a material(M). The press assembly applies pressure to the material from above. The segment assemblies are installed on the top of the support assembly to surround a side of the support assembly.

Description

Inner race manufacturing device and manufacturing method of constant velocity joint for vehicle {Manufacturing System for Inner Race of a Constant Velocity Joint for a Vehicle}

The present invention relates to the manufacture of the inner race of a constant velocity joint for a vehicle, and more particularly, to the inner race of the constant velocity joint for a vehicle in which a plurality of segment assemblies are provided to close all sides of the material so that forging is performed by one closed forging method. It relates to a lace manufacturing apparatus and a manufacturing method.

In general, the power of a vehicle engine is transmitted to a drive wheel by a drive shaft via a transmission. The drive shafts used here are usually prone to torsional vibrations because they rotate at high speed under the constant torque of the engine.

The drive shaft is equipped with a shaft joint member called a universal joint at both ends to smoothly transfer the power transmitted from the engine to the drive wheel.

The constant velocity joint is a kind of such a shaft joint member, and is composed of an inner shaft, an outer housing, an inner race, an outer race, a steel ball, and the like.

1 is a plan view of the inner race 10 constituting such a constant velocity joint.

As shown in the figure, the inner race 10, a plurality of inner ring processing portion 20 is formed in a hemispherical shape. That is, a plurality of inner ring processing portions 20 recessed inwardly are formed at the edges of the inner race 10 at equal intervals.

Steel ball (not shown) is in contact with the inner ring processing portion 20 to make a rolling motion. That is, when the constant velocity joint rotates, the steel ball (not shown) rotates while making a rolling contact between the inner race 10 and the outer race (not shown).

In addition, the inner race 10 is generally formed by cutting, but when all processes are performed by cutting, the work efficiency is reduced and the waste of materials is excessive, so that forging and cutting are combined. Used.

First, a rough shape is formed by forging, and then cutting is generally performed, and the inner ring processing part 20 is formed during forging.

However, in the conventional forging process, because the forging process is performed by the upper and lower molds in close contact with each other, a band made of a burr is formed on the outer surface of the inner ring processing portion 20 central portion. That is, a band-shaped burr is formed due to the gap between the upper mold and the lower mold, and the cutting process has to be performed again to remove the burr.

In addition, since the inner ring processing portion 20 has a hemispherical shape recessed inward as shown, there are many difficulties in cutting using a lathe or the like. Therefore, not only the machining is difficult but also the required time is excessive, there is a problem that the work efficiency is lowered.

An object of the present invention is to solve the problems of the prior art as described above, for the vehicle to be closed forging process by the press assembly and support assembly for pressing the material up and down, and the segment assembly for pressing the material from the side It is to provide an inner race manufacturing apparatus of a constant velocity joint.

Another object of the present invention is to provide an inner race manufacturing method of a constant velocity joint for a vehicle, characterized in that forging is performed by one closed forging method in which the outside of the raw material is closed.

An inner race manufacturing apparatus for a constant velocity joint for a vehicle according to the present invention for achieving the above object includes a support assembly for supporting a lower portion of a material; A press assembly for applying pressure to the work from the top of the work; It is installed on the upper side of the support assembly, consisting of a configuration including a plurality of segment assemblies surrounding the side of the material; The forging operation is performed in a state where the upper and lower sides of the material are sealed.

Inner race manufacturing apparatus and manufacturing method of a constant velocity joint for a vehicle according to the present invention, in the inner race material processing of the constant velocity joint for a vehicle, the inner race material is forged by one closed forging method to close the outside of the raw material in close contact Characterized in that the processing is made.

According to the inner race manufacturing apparatus and manufacturing method of the constant velocity joint for a vehicle of the present invention as described above, the inner race material is forged by a single closed forging method in which the outside of the material is closed and in close contact.

Therefore, the outer surface of the material formed after the forging process, in particular, the recessed surface which is recessed relatively inward and in contact with the steel ball is smoothly formed. That is, as in the prior art, the burr due to the gap between the upper and lower molds is not formed on the indented surface of the forging.

As described above, according to the present invention, since the recessed surface does not need to be cut separately after the inner race is processed by the closed forging, the work efficiency is improved.

Hereinafter, an inner race manufacturing apparatus and a manufacturing method of a constant velocity joint for a vehicle according to the present invention will be described with reference to FIG.

Figure 2 is a cross-sectional view showing a state in which the material is seated on the inner race manufacturing apparatus of the constant velocity joint for a vehicle according to a preferred embodiment of the present invention.

As shown in this, the manufacturing apparatus according to the present invention, the support assembly 100 for supporting the lower portion of the material (M), the press assembly 200 for applying pressure to the material from the upper side of the material (M), and Is installed on the upper side of the support assembly 100 consists of a plurality of segment assembly 300, etc. surrounding the side of the material (M).

The support assembly 100 is provided on the lower side to support the lower portion of the material M. The support assembly 100 is composed of a plurality of parts.

The press assembly 200 is installed at a position spaced apart from the support assembly 100 by a predetermined distance upward, and selectively moves to the support assembly 100 while moving upward and downward.

The segment assembly 300 is installed on the upper side of the support assembly 100, and is installed to evenly cover the front, rear, left, and right sides of the material M.

Therefore, the forging operation is performed in the state in which the material M is completely closed by the support assembly 100, the press assembly 200, and the segment assembly 300 as described above. That is, the forging operation is performed in a state where the upper and lower sides of the material M are sealed.

The support assembly 100 includes a support die 110 for supporting a plurality of parts, a knockout 120 provided below the material M to support the material M, and the knockout 120. The knockout guide 122 for guiding the up and down movement of the knockout 120, the knockout space 124 provided at the lower side of the knockout 120 to support the knockout 120, and the forging process is completed, and then the material M is upward. And an ejector 130 to escape.

The knockout 120 is provided on the upper side of the support die 110 to support the lower portion of the material M, and after the forging of the material M is completed, the material M may be hit by the material M from below. M) to escape to the top.

Accordingly, the knockout 120 is formed to be vertically long as shown, and the knockout guide 122 is provided on the outside of the knockout 120.

The knockout guide 122 is configured to surround the side of the knockout 120 to guide the vertical movement of the knockout 120. Therefore, the inner surface of the knockout guide 122 is configured to correspond to the outer surface of the knockout 120, so that the knockout 120 slides inside the knockout guide 122.

The knockout space 124 is provided at the lower side of the knockout 120 to support the knockout 120 and is provided with two up and down as shown.

On the other hand, as shown, the socket screw 140 is fastened from the bottom toward the top of the lower center portion of the knockout 120.

The ejector 130 is provided above and below the knockout space 124 to selectively price the lower end of the knockout space 124. In addition, when the strike of the ejector 130 is transmitted to the knockout 120, the material M on the upper side of the knockout 120 escapes upward.

And, as shown, the die plate 150 is provided on the upper surface of the support die 110. The central portion of the die plate 150 penetrates up and down, and the knockout space 124 and the knockout 120 are accommodated in the central penetration portion.

A die space 152 is provided on an upper surface of the die plate 150, and upper ends of the knockout guide 122 and the knockout 120 are positioned inside the die space 152.

The press assembly 200, the punch 210 for pressing the upper surface of the material (M), the punch plate 220 and punches configured to surround the outer side of the punch 210 to support the punch 210 A case 222, a punch ejector 230 for hitting the punch 210 to selectively protrude downward, an insert punch 240 provided inside the punch 210, and the like. It consists of.

The punch 210 is formed vertically long in the center portion of the press assembly 200 to press the upper surface of the material (M). The upper end of the punch 210 has a larger diameter than the lower portion.

The punch plate 220 is formed to surround the upper half of the punch 210. That is, the upper half of the punch 210 having a relatively large diameter is fixed to the punch plate 220.

The punch case 222 is provided on the lower side of the punch plate 220 to surround the outer side of the lower half of the punch 210.

The inner side of the punch 210 is a circular passage formed up and down long, the insert punch 240 is inserted into this passage. The insert punch 240 has an overall long rod shape up and down, and the upper end portion is formed to have a relatively larger diameter.

In addition, an insert end portion 242 inserted into the center portion of the raw material M protrudes downward from the lower end portion of the insert punch 240. That is, as shown, the lower end of the insert punch 240 is formed with an insert end portion 242 having a rounded curvature, the insert end portion 242 protrudes downward from the lower end of the punch 210 It is formed to be.

Therefore, the insert end portion 242 descends from the upper side during the forging operation and presses the central portion of the raw material M so that the central portion of the raw material M is recessed.

An insert punch space 250 is provided on an upper side of the insert punch 240, and two insert punch spaces 250 are provided to layer up and down.

A punch space 260 is provided above the insert punch space 250 and the punch 210, and the punch ejector 230 is formed long on the upper side of the punch space 260.

The punch ejector 230 is formed in a round bar shape, the upper half selectively protrudes above the press die 270. That is, the punch ejector 230 hits the punch 210 so that the punch 210 selectively protrudes downward.

The segment assembly 300 is composed of six segments 310 surrounding the side surface of the material M to be closed, six segment holders 320 supporting the segment 310, and the like.

Six segment assemblies 300 are radially disposed about the knockout 120 at equal intervals. The six segment holders 320 are installed to be connected to each other. That is, the segment holder 320 is preferably formed integrally with six, or at least six are connected and fixed to each other.

In addition, as shown, the inner surface of the segment holder 320 and the outer surface of the segment 310 is formed to have a slope corresponding to each other. That is, referring to Figure 2, the outer surface of each segment 310 of the left and right facing each other is formed to be gradually closer to the lower side, forming an inclined surface.

In addition, the inner side surfaces of the left and right segment holders 320 facing each other are formed to be closer to each other as they go downward, and have the same slope as the outer surface of the segment 310.

Therefore, the outer surface of the segment 310 and the inner surface of the segment holder 320 are in contact with each other, so that the segment 310 is slidable along the inner surface of the segment holder 320.

On the other hand, the inner surface of the segment 310 is provided with a concave portion 312 so that the outer surface of the material (M) is molded into a rounded shape protruding convex. That is, as shown, the lower portion of the plurality of segments 310 is formed with a concave portion 312 having a '()' cross section. Therefore, when the insert end portion 242 presses the center upper surface of the raw material M, the side surface of the raw material M is pushed laterally to form a convex portion corresponding to the concave portion 312.

Of course, when the concave portion 312 is viewed from above, the concave portion 312 is made of rounded irregularities. That is, it has a shape corresponding to the outer surface shape of the inner race 10 shown in FIG.

The segment holder 320 is fixed to the support assembly 100 by a screw.

According to such an inner race manufacturing apparatus, the inner race material M is forged by a single closed forging method that closes and closes the outside of the material M. Therefore, no burr remains on the concave outer surface of the material M having the curvature.

Hereinafter, a method of manufacturing an inner race manufacturing apparatus for a constant velocity joint for a vehicle as described above will be described with reference to FIGS. 2 to 5.

The manufacturing method according to the present invention relates to a method for processing inner race materials of a constant velocity joint for a vehicle, wherein the inner race material (M) is forged by a single closed forging method that closes and closes the outside of the material (M). Characterized in that made.

In the closed forging method, the loading step (S400) of loading the material (M) to the support assembly 100 and the loading step (S400) using the plurality of segment assemblies 300. Fixing step (S410) surrounding the side of the loaded material (M) loaded by (S410), and press the press assembly 200 from above to fix the material (M) fixed by the fixing step (S410) in a closed space Forming step (S420) to change the shape of the, and forging by the forming step (S420) is composed of a take-out step (S430) for discharging the finished material to the outside.

The loading step (S400) is a process of placing a cylindrical material (M) on the upper end of the center of the support assembly 100.

In addition, the fixing step (S410) is a process of tightening the plurality of the segment assembly 300 provided in a radially inward, tightly fixing the side of the material (M) placed on the support assembly 100.

When the fixing step (S410) as described above is completed, the state as shown in FIG.

Next, the forming step (S420) is a process of pressing the material (M) by lowering the press assembly 200 spaced apart a predetermined distance above the support assembly 100 to the lower side.

In the forming step (S420), first, the press assembly 200 is lowered in the state as shown in FIG. 2, and at this time, the upper portion of the punch ejector 230 accommodated in the press die 270 is a press die ( 270 protrudes to the top. That is, when the press assembly 200 gradually descends and the insert end portion 242 touches the upper surface of the material M, the punch ejector 230 is pushed upwards to the upper side of the press die 270. It is protruding.

When the press assembly 200 gradually descends to press the upper surface of the material M, the molding of the material M is performed, and a state in which the forming step S420 is completed is illustrated in FIG. 4.

After the forming step (S420) as described above is completed, the take-out step (S430) for taking out the forging is completed material (M) to the upper side of the segment 310 is performed.

The take-out step (S430), the return process (S432) to move the press assembly 200 to the original position to the top, and hitting the material (M) wrapped by the plurality of segments (310) by applying a segment ( 310) a discharge process (S434) to be discharged to the upper side.

The return process (S432) is a process in which the press assembly 200, which descends to the lower side and presses the upper surface of the material M, moves upward and returns to its original position. At this time, the punch ejector 230 is lowered again, the upper end is inserted into the press die 270.

The discharging process S434 is a process of discharging the processed material M wrapped inside the plurality of segments 310 to the upper side of the segment 310. Therefore, in this case, the ejector 130 strikes the knockout 120 so that the material M is discharged upward.

That is, when the knockout 120 is moved upward by being pushed by the ejector 130, the material M placed on the knockout 120 is pushed upward, and at this time, a large number of the materials M are wrapped. Segment 310 is moved upward by sliding the inner surface of the segment holder 320. Therefore, the distance between the plurality of segments 310 is increased so that the material M accommodated between the segments 310 is pushed upward.

The state in which the discharging process S434 is completed is shown in FIG. 5.

6a and 6b shows the configuration of the material M is completed forging by the above process. That is, FIG. 6A shows a plan view of the material processed by the method of manufacturing the forging apparatus according to the present invention, and FIG. 6B shows a front end surface of the forged material shown in FIG. 6A.

As shown in the figure, the outer surface of the material (M) is made of a protruding surface (M1) protruding relatively outward by forging, and a recessed surface (M2) recessed inward relatively. In addition, the recessed surface M2 is a portion corresponding to the inner ring processing portion 20 described in the prior art. Therefore, since the recessed surface M2 has a smooth surface formed by the segment 310, a separate cutting process is unnecessary as in the prior art.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the above technical scope.

1 is a plan view showing the configuration of the inner race constituting a general constant velocity joint.

Figure 2 is a front sectional view showing the configuration of a preferred embodiment of the inner race manufacturing apparatus of a constant velocity joint for a vehicle according to the present invention.

Figure 3 is a block diagram showing a process of a preferred embodiment of the inner race manufacturing method of a constant velocity joint for a vehicle according to the present invention.

Figure 4 is a cross-sectional view of the manufacturing apparatus showing a state in which the molding step according to an embodiment of the present invention was performed.

5 is a cross-sectional view of the manufacturing apparatus showing a state that the extraction step according to the embodiment of the present invention was performed.

Figure 6a and Figure 6b is a plan sectional view and a front sectional view showing the configuration of the forging is completed by the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100. Support Assembly 120. Knockout

200. Press Assembly 210. Punch

240. Insert Punch 300. Segment Assembly

310. Segment 320. Segment holder

S400. Loading step S410. Fixed stage

S420. Molding step S430. Ejection stage

Claims

A support assembly 100 supporting the lower portion of the material M;

A press assembly 200 for applying pressure to the workpiece from above the workpiece M;

It is installed on the upper side of the support assembly 100, consisting of a configuration including a plurality of segment assembly 300 surrounding the side of the material (M);

Inner race manufacturing apparatus for a constant velocity joint for a vehicle, characterized in that forging operation in a state in which the upper and lower sides of the material (M) is sealed.

The method of claim 1, wherein the plurality of segment assemblies 300,

A six segment (310) surrounding the side surface of the material (M) and a six segment holder (320) supporting the segment (310);

An inner side surface of the segment holder 320 and an outer side surface of the segment 310 are formed to have slopes corresponding to each other, such that the segment 310 is configured to slide along an inner side surface of the segment holder 320;

Inner race manufacturing apparatus for a constant velocity joint for a vehicle, characterized in that the inner side of the segment 310, the outer surface of the material (M) is provided with a concave portion (312) to be molded into a rounded convex projecting.

The method of claim 2, wherein the support assembly 100,

A support die 110 for supporting a plurality of parts;

It is provided on the upper side of the support die 110, provided below the material (M) to support the material (M) lower, hitting the material (M) from the lower side after the forging of the material (M) is completed A knockout 120 to allow the material M to escape upwardly;

A knockout guide 122 configured to surround a side of the knockout 120 to guide vertical movement of the knockout 120;

A knockout space 124 provided below the knockout 120 to support the knockout 120;

A ejector (130) provided above and below the knockout space (124) to selectively strike the lower end of the knockout space (124) to allow the material (M) to escape upward by the knockout (120); Inner race manufacturing apparatus for a constant velocity joint for a vehicle having a configuration comprising a.

According to any one of claims 1 to 3, The press assembly 200,

A punch 210 for pressing the upper surface of the material M;

A punch plate 220 and a punch case 222 configured to surround the outer side of the punch 210 to support the punch 210;

A punch ejector (230) provided above the punch (210) to strike the punch (210) so that the punch (210) selectively protrudes downward;

It is provided on the inner side of the punch 210, the lower end portion of the insert end portion 242 inserted into the center portion of the material (M) is formed so as to protrude downward from the lower end of the punch 210; Inner race manufacturing apparatus for a constant velocity joint for a vehicle, characterized in that it has a configuration to.

In processing the inner race material of the constant velocity joint for a vehicle,

The inner race material is a method for manufacturing an inner race for a constant velocity joint for a vehicle, characterized in that forging is performed by one closed forging method in which the outside of the material is closed and in close contact.

The method of claim 5, wherein the closed forging method,

A loading step (S400) of loading the material (M) into the support assembly (100);

A fixing step (S410) surrounding the side of the material (M) loaded by the loading step (S400) by using a plurality of segment assemblies (300);

Pressing the press assembly 200 from above, forming step (S420) to change the shape of the fixed material (M) by the fixing step (S410) in a closed space;

Inner race manufacturing method of a constant velocity joint for a vehicle, characterized in that it comprises a; take-out step (S430) for releasing the forging is completed by the forming step (S420) to the outside.

The method of claim 6, wherein the taking out step (S430),

A return process (S432) for moving the press assembly 200 upward and returning to the original position;

Inner race manufacturing method of a constant velocity joint for a vehicle, characterized in that it comprises a discharge process (S434) to be discharged to the upper side by applying a blow to the material (M) wrapped by the plurality of segments (310).