JP2001162347A - Closed forging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a die differential action type closed forging apparatus whose structure and action is simple, with which a product having recessed parts at both end surfaces is manufactured by hitting respective punches into a cavity formed with a fixed side die and a shiftable side die from both die sides. SOLUTION: After allowing the shiftable side die 50 in mutually contact it the fixed side die 17 by advancing a ram 6, connecting members 24...24 are engaged to both dies 17 and 50 by advancing a relatively shiftable slide sleeve 48 in the front and rear directions to this ram 6 to combine both dies. In this state, both dies are shifted to the fixed punch 21 side with this slide sleeve 48, and a driving rod 68 integrally shifted with the this slide sleeve 48, is driven with a cam mechanism 90 linked with the shifting of the ram 6, and then both dies integrally shifted with the slide sleeve 48, is shifted at slower speed than that of the shifting side punch 53 integrally shifted with the ram 6 and constituted so that this shifting timing can freely be changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging device for forming various metal parts, and more particularly to an improvement in a closed forging device.

[0002]

2. Description of the Related Art A hermetically sealed cavity is formed by a fixed-side die and a movable-side die that is in contact with and separate from the die, and a punch is inserted into the fixed-side die in this cavity. There has been known a closed forging apparatus in which a material is formed into a product having a predetermined shape such as a gear, and the product is discharged by a knockout mechanism.

[0003] This knockout mechanism is usually provided on the fixed die side. After the punch is inserted into the fixed die, the punch is separated from the fixed die, and the material driven into the fixed die is knocked out by a knockout pin. Although the material is extruded and discharged, in this type of forging device, one end of the raw material may be subjected to forging on the moving die side. In this case, one end of the material is also driven into the moving die side.
As disclosed in Japanese Patent No. 15844, a knockout mechanism is provided on the movable die side to push the material from the movable die with a knockout pin.

[0004] In this type of closed forging apparatus, when a product having a concave portion on both end surfaces or a product having a projecting portion on the outer peripheral surface is formed, punches are forced into the cavity from both sides. Attempts to move both punches at the same time sometimes significantly complicate the structure.

[0005] Further, one punch is fixed in a state where it is protruded into the cavity by a predetermined amount, and from this state, the other punch is protruded into the cavity so that concave portions are formed on both end surfaces of the material in the cavity. Or, when a projection is to be formed on the outer peripheral surface of the material, the material is pressurized only from the other punch side, and the flow of the material is insufficient, and the two sides are extremely uneven. Therefore, there is a problem that the product is not formed well.

Therefore, as shown in FIG. 14, from the state where the material Z is sandwiched between the punches Y1 and Y2 on both sides at the center of the cavity X, one punch Y2 is moved toward the other punch Y1 by a predetermined amount (L ) Move and at the same time, cavity X
For example, a material in which the material Z is uniformly pressed from both sides by the punches Y1 and Y2 by moving itself by, for example, １ ／ of the moving amount has been put into practical use. For example, Japanese Patent
There are apparatuses disclosed in Japanese Patent Publication No. 39711 and Japanese Patent Publication No. 6-85555.

[0007] Forging devices employing these differential structures are:
In each case, the upper and lower dies that can approach and separate from each other, the upper and lower cylinders that urge the dice in the direction in which they come into contact with each other, and the upper and lower punches that penetrate these dies respectively The lower punch is fixed among the punches on both sides, and the upper punch is attached to an elevating slide supporting the upper die, and further linked with the lowering of the upper punch integrated with this slide, and the speed is lower than that speed. A differential mechanism for lowering the upper and lower dies at a speed while maintaining the contact state is provided.

According to this, when the material is supplied, the upper and lower dies are brought into contact with each other to form a hermetically sealed cavity in which the material is stored, and in this state, the lifting slide is lowered. By lowering the cavity through the differential mechanism, the lower punch relatively rushes into the cavity from below, and the upper punch descending at a speed higher than the lowering speed of the cavity from above the cavity. You will rush. Therefore, the material in the cavity is pressed almost uniformly from above and below, and the product is formed well.

[0009]

However, in each of the above-mentioned differential type closed forging devices, in addition to the driving means for raising and lowering the slide, a cylinder for sealing the upper and lower dies, and an interlocking mechanism for lowering the slide. Then, a differential mechanism for lowering the die at a speed lower than that speed is required, and since the cylinder and the slide must be operated here, the structure becomes complicated and the size increases, The operation also becomes complicated. Therefore, it is difficult to apply the apparatuses disclosed in these publications as one station of a multi-stage molding machine in which a plurality of molding stations are provided in parallel and these stations operate synchronously and simultaneously.

Therefore, the present invention realizes a differential type closed forging device having a simple structure and operation as described above,
In particular, it is an object of the present invention to provide a closed forging device that can be easily applied to a multi-stage molding machine.

[0011]

Means for Solving the Problems In order to solve the above problems, each invention of the present application is characterized in that it is configured as follows.

First, an invention according to claim 1 of the present application (hereinafter, referred to as a first invention) is provided with a first die provided on a fixed member and a moving member which moves forward and backward to face the fixed member. The second die, which comes into contact with and separates from the first die
A die and first and second punches on a fixed side and a movable side which respectively protrude from both dies into a cavity formed by contacting these dies, and these are used to convert a material into a product having a predetermined shape. In the closed forging device for molding, the first die is held movably in the axial direction in a die housing provided on a fixed member, and is urged toward the second die by a first spring member. And a plurality of die connecting members arranged around the first die and compressed by being pushed into the rear of the housing. On the other hand, the second die is axially moved to the moving member. A second spring member urges the slide member together with the slide member toward the first die, and the slide member includes a moving part. After the first and second dies have come into contact with each other in the forward travel of the die, a pressing portion is provided which presses the die connecting member deep into the die housing to engage the die connecting member across the first and second dies. And a rod member that moves integrally with the slide member is disposed behind the slide member in the moving member, and the die connecting member engages with the first and second dies, and the fixed member side Fix the first punch of
In a state in which the second punch on the moving member advances integrally with the moving member, the second punch operates in conjunction with the moving member to retreat the slide member relative to the moving member via the rod member. And a cam mechanism for moving the slide member forward at a lower speed than the moving member.

Next, the invention according to claim 2 (hereinafter referred to as the second invention)
Invented. In the closed forging apparatus according to the first aspect, the closed forging apparatus is provided in a multi-stage molding machine having a plurality of forming stations to which the material is sequentially supplied, and constitutes one of the forming stations. It is characterized by the following.

With the above arrangement, the following effects can be obtained according to the present invention.

First, the first invention will be described. If a material is supplied between a first die on the fixed member side and a second die on the moving member side, and the moving member is advanced to the fixed member side, First, the first die moves to the second die side via the moving member so that the two dice contact each other, and the material is stored in the cavity formed by the two dice. Next, the pushing portion provided on the moving member pushes the plurality of die connecting members into the inner side of the die housing, so that these connecting members are engaged across the first and second dies that are in contact with each other. The two dies are mechanically joined to close the cavity.

Thereafter, as the moving member advances, the two dies are further moved toward the fixed member in the connected state. At this time, the first and second dies and the die connecting member connecting them are: It will move integrally with the moving member.

At this time, since the slide member moves at a speed lower than the advance speed of the moving member by the operation of the cam mechanism interlocked with the moving member, the first and second dies or the cavities formed by these dies are moved. Also moves to the fixed member side at a slow speed, and the first fixed to the fixed member.
At that speed, the punch relatively protrudes into the cavity from the first die side. Further, the second punch, which advances integrally with the moving member, advances at a speed relatively higher than the advance speed of the cavity.
It will enter from the dice side.

In this way, simply by moving the moving member forward, the first and second dies are brought into contact with each other by the first and second dies.
The punching operation from both sides of the cavity of the punch is continuously performed, and, for example, a product having a concave portion on both end surfaces and a product having a protruding portion on the outer peripheral surface can be manufactured favorably and efficiently.

In this apparatus, in particular, a differential mechanism for moving the slide member at a lower speed than the moving member includes a rod member moving integrally with the slide member, and a rod member moving the rod member at a lower speed than the moving member. The cam mechanism which is moved forward by means of the differential mechanism has a very simple structure, and the provision of this differential mechanism avoids a large increase in the number of components and an increase in the arrangement space.

If a conventional closed forging device having a knockout mechanism on the moving die side is used, the knockout pin for pushing out the material is changed to a rod member that moves integrally with the slide member, and the device is provided in the device. The above problem can be easily achieved by replacing the cam plate in the cam mechanism with a cam plate that advances the rod member at a lower speed than the moving member.

Further, by replacing the cam plate in the cam mechanism of this device with a cam plate having a different cam action surface, the moving speed, moving time, stroke, etc. of the slide member can be easily changed.

Further, since the cam mechanism for moving the slide member at a lower speed than the moving member is supported by the moving member, when the moving member is retracted, the cam mechanism and the fixed member are moved. There will be spaces between them.

Therefore, when the closed forging device of the present invention is applied to one station of a multi-stage molding machine having a plurality of stations as in the second invention, the structure of the entire molding machine is extremely complicated. For example, a product having concave portions on both end surfaces and a protruding portion on the outer peripheral surface without incurring an increase in size and size, and without hindering the operation of other stations and the transfer of material between stations. The product can be manufactured continuously at good speed and at high speed.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A closed forging device according to an embodiment of the present invention will be described below.

In this embodiment, the closed forging apparatus according to the present invention is applied to a multi-stage molding machine having a plurality of molding stations. As shown in FIG. A fixed frame 3 fixed to the frame 2 has a cutter device 4 and first to third fixed-side die units 5a to 5
c, and the first to third moving-side die units 7a to 7c are respectively provided on the ram 6 which advances and retreats toward the fixed frame 3 so as to face the fixed dies.
And the corresponding fixed-side die unit and moving-side die unit have three stages of forming stations S.
1 to S3 are configured.

The first molding station S1 includes:
The end face of the material obtained by cutting the wire a with the cutter device 4 is corrected to form a columnar material A having a predetermined dimension as shown in FIG.

The second forming station S2 performs closed forging on the columnar material A, and as shown in FIG. 3, a plurality of (only one shown) arms B 'projecting radially around the periphery. An intermediate product B having B ′ and having concave portions B ″ and B ″ on both end surfaces is formed. Here, the fixed die unit 5b in the second molding station S2
The closed die forging device according to the present invention is constituted by the movable die unit 7b and the movable die unit 7b.

Further, the third molding station S3 is formed by punching between the recesses B ", B" at both end surfaces of the intermediate product B manufactured at the second molding station S2, as shown in FIG. A final product C having a through hole C ′ is formed.

Next, at the second forming station S2, the fixed die unit 5b constituting the closed forging device
The configuration of the moving die unit 7b will be described.

As shown in FIG. 5, the fixed side die unit 5b is provided with mounting holes 3a provided in the fixed frame 3.
And a substantially cylindrical die housing 13 inserted and fixed from the back via first and second receiving members 11 and 12,
A die holder 14 is inserted into the center of the housing 13 so as to be able to move back and forth, and a spring 15 for urging the die holder 14 forward (toward the moving die unit) is moved forward by the urging at the position shown in the figure. A stopper bolt 16 for regulating is provided.

On the front end face of the die holder 14, a fixed die 17 having a molding concave portion corresponding to a shape obtained by dividing the intermediate product B into two is mounted.

The die holder 14 and the fixed die 1
7 is provided with a through-hole 18 extending over these. An eject sleeve 19 is slidably inserted in the through-hole 18 back and forth. A fixed-side punch 21 whose part is attached to a retainer 20 and supported so as to be slidable back and forth is inserted. And the above-mentioned eject sleeve 19
When the product is discharged, the knockout mechanism (not shown) is operated so as to be pushed forward through the KO pin 22 and the KO rod 23.

Further, the outer peripheral surface of the front end portion of the die holder 14 is formed as an uneven surface 14a by a plurality of circumferential grooves, and the outer peripheral surface of the die holder 14 and the inner peripheral surface of the front end portion of the die housing 13 are formed. A plurality of die connecting members 24... 24 are fitted in the space. As shown in FIG. 6, these connecting members 24... 24 are each formed by dividing a cylindrical member into four at 90 °, and the inner peripheral surface of each connecting member 24. When it comes into close contact with the surface of the die holder 14
The concave and convex surfaces 24a.

As shown in an enlarged view in FIG. 7, the outer peripheral surfaces of these connecting members 24... 24 are, from the front end side, a large-diameter first cylindrical surface 24b, a first tapered surface 24c, and a small-diameter second
The inner peripheral surface of the front end portion of the die housing 13 into which the connecting members 24... 24 are fitted is also formed as a first step having a large diameter from the front end side. Cylindrical surface 13b, first tapered surface 13
c, small diameter second cylindrical surface 13d, second tapered surface 13e,
A third cylindrical surface 13f having a smaller diameter than the second cylindrical surface 13d is formed in a stepped shape so as to be narrower toward the back.

As shown in FIG. 6, the connecting members 24 are connected to each other by springs 25.
And are urged to increase the diameter as a whole. Then, in the state where the diameter is expanded, as shown in FIGS. 5 and 7, the first cylindrical surface 24b and the first tapered surface 24 are formed.
c, the second cylindrical surface 24d, and the second tapered surface 24e
A first cylindrical surface 13b of the die housing 13,
Each of the connecting members 24... 24 is pushed into the die housing 13 from the state shown in FIG. 5 while being in contact with the first tapered surface 13 c, the second cylindrical surface 13 d, and the second tapered surface 13 e. When the first tapered surface 24c, 13c and the second tapered surface 24
e and 13e are guided in the direction of reducing the diameter as a whole along the respective contact surfaces.

The rear ends of the connecting members 24... 24 are supported by a ring member 26 slidably fitted on the third cylindrical surface 13 f of the die housing 13. 27, a plurality of pins 28 urged forward by springs 27... 27 mounted between the ring member 26 and the second receiving member 12.
28 (only one shown) are in contact with each other, and the connecting members 24... 24 are urged forward by the springs 27. The forward movement is caused by a stopper plate 29 provided on the front end face of the die housing 13.
Thus, the position is regulated at the illustrated position.

Next, the structure of the movable die unit 7b will be described. As shown in FIGS.
One end of a connecting rod 43 is connected via a crankpin 42 to a crankshaft 41 which is eccentrically rotated, and the ram 6 is connected to a connecting pin 44 attached to the other end of the rod 43. As a result, the ram 6 moves with the rotation of the crankshaft 41, so that the movable die unit 7b attached to the ram 6 moves forward and backward with respect to the fixed die unit 5b attached to the frame 3. Is configured.

An outer holder 45 is fixed to the front surface of the ram 6, and an inner holder 46 is fitted inside the outer holder 45. A load from the front (the fixed frame 3 side) is inserted into the inner holder 46. A receiving member 47 for receiving the light is fixed.

Further, inside the inner holder 46,
A slide sleeve 48 is inserted so as to be slidable in the front-rear direction, and a die holder 49 is attached to the front end of the slide sleeve 48. The front end face of the die holder 49 corresponds to a shape obtained by dividing the intermediate product B into two. A movable die 50 having a forming concave portion is held.
The outer peripheral surface of the die holder 49 is an uneven surface 49a similar to the uneven surface 14a on the outer periphery of the front end of the die holder 14 in the fixed die unit 5b.

The front end surface 48a of the slide sleeve 48 is opposed to the front end surface of the die connecting members 24... 24 in the fixed die unit 5b, and the movable die unit 7b or the slide sleeve 48 is advanced by a predetermined amount. At this point, the front end surfaces 48a of the sleeves 48 come into contact with the front end surfaces of the connecting members 24... 24 so that these connecting members 24.

Here, the slide sleeve 48 is restricted in its slidable range with respect to the inner holder 46 by a restriction pin 51, and is prevented from rotating.

In the center of the die holder 49 and the die 50, a through-hole 52 is provided astride them. In the through-hole 52, the front part of the moving punch 53 is slidably inserted in the front and rear directions. In addition, an auxiliary punch 54 slidably inserted into the slide sleeve 48 is disposed behind the punch 5.
The moving-side punch 53 is urged forward by a spring 55 mounted between the dies 3 and 54 to a position where the leading end protrudes from the die 50 by a predetermined amount.

A spring biasing the inner holder 46 toward the receiving member 47 is provided between the spring receiving members 56, 56 attached to the inner holder 46 and the spring receiving members 57, 57 attached to the slide sleeve 48. 58, 58 are mounted.

On the other hand, a tapered groove 59 is formed between the outer holder 45 and the ram 6, and the tapered groove 59 is formed.
And a vertically movable taper member 60 is provided in contact with the tapered surface 6a 'of the ram 6 side.
The base member 61 is fixed over the upper surfaces of both the ram 6 and the ram 6. A screw shaft 62 is attached to the upper surface of the taper member 60 in a state where the screw shaft 62 is stopped by a lock nut 63. The body 64 is screwed. Therefore, the nut-like body 6
4 is rotated by an appropriate means, so that the tapered member 60 is rotated.
Is moved up and down, the first pressing member 65 interposed between the tapered member 60 and the back surface of the receiving member 47, and the receiving member 47 together with the auxiliary punch 54 via the sleeve member 66. The punch mounting position can be adjusted.

Further, inside the sleeve member 66,
A second pressing member 67 is slidably inserted in the front-rear direction with respect to the sleeve member 66, and a front end portion of a drive rod 68 integrally linked with the slide sleeve 48 is provided on a rear end surface of the second pressing member 67. Pins 69... 69 are interposed between the second pressing member 67 and the slide sleeve 48 so as to pass through the receiving member 47.

Further, a space 70 is formed between the base 6b and the front surface 6a of the ram 6, and a space 70 is formed.
A support shaft 72 is rotatably arranged in a vertical direction in a direction in which the ram 6 moves forward and backward between a pair of brackets 71 (only one is shown) standing upright on the upper surface of the ram 6. . A drive lever 73 is attached to the support shaft 72, and one end of the drive lever 73 is suspended from the space 70 and is in contact with a rear end of the drive rod 68 via a buffer member 74.

Therefore, rod holes are formed integrally with the first pressing member 65, the taper member 60 and the ram front surface portion 6a, and the driving rod 68 is slidably inserted into these rod holes. When the driving rod 68 is moved back and forth by the driving lever 73, the second pressing member 67 and the pins 69... 69 are interlocked integrally with the driving rod 68, whereby the slide sleeve 48 and the die 50 are moved together. It is designed to move back and forth.

Further, at a position above the support shaft 72 and near the connecting pin 44, a pair of brackets 75 (only one of which is shown) standing upright on the upper surface of the ram 6 is provided.
A cam shaft 76 is rotatably arranged in parallel with the support shaft 72,
A cam plate 77 is attached to the cam shaft 76. A lever 78 is provided on the cam plate 77 or the cam shaft 76, and one end of a connecting link 80 is pivotally connected to one end of the lever 78 via a connecting pin 79, and the other end of the connecting link 80 is connected to a connecting pin. A portion near the crankshaft 41 via 81 is pivotally connected to the connecting rod 43. Therefore, of the kinetic force due to the eccentric rotation of the crankshaft 41, the force of the vertical movement component is changed to
The cam plate 76 is taken out through the camshaft 76 via the shaft and the cam plate 77 rotates.

In this case, a cam follower 83 provided at one end of a drive arm 82 attached to the support shaft 72 is in contact with the cam action surface of the cam plate 77.
A rod 84 is erected on the upper surface of the ram 6 so as to always bias the cam follower 83 in the direction of contacting the cam plate 77. The rod 84 is inserted through the other end of the drive arm 82 and A coil spring 86 is provided between the receiving member 85 at the tip and the other end of the drive arm 82. Thereby, the movement of the drive arm 82 is absorbed by the coil spring 86 and at the same time, the cam follower 8 is moved.
3 is always urged in the direction of contact with the cam plate 77.

As described above, the cam mechanism 90 for performing the above-described differential operation includes the cam plate 77, the drive rod 68, the drive lever 73, and the drive arm 82.

Next, the operation of the multi-stage molding machine 1, particularly the operation of the second molding station S2 for performing closed forging will be described.

As shown in FIGS. 5 and 8, a columnar material A is transferred from the first molding station S1 to the second molding station S1.
2, the movable die unit 7b moves forward together with the ram 6, and the movable punch 53 of the unit 7b transfers the material A to the die 17 and the die holder 14 in the fixed die unit 5b.
Is pressed into the hole 18 at the center of the hole 18 and the material A is sandwiched between the hole 18 and the fixed side punch 21.

As shown in FIG. 9, the die holder 49 of the movable die unit 7b and the front end face of the movable die 50 held by the holder 49 are connected to the die holder 14 and the holder 14 of the fixed die unit 5b.
A cavity having a predetermined shape is formed by the two dies 17 and 50 in contact with the front end surface of the fixed die 17 held by the dies.

When the ram 6 further advances in this state, as shown in FIG. 10, the two dies 17, 50 whose front end surfaces are in contact with each other are placed in the die housing 13 of the fixed-side die unit 5b. At the time of being pushed against the urging force and being pushed by a predetermined amount, the front end surface 48a of the slide sleeve 48 in the movable die unit 7b is stored in the die housing 13 by the 4
24 are in contact with the front end surfaces of the die connecting members 24.

At this time, the rear end of the fixed-side punch 21 abuts against the second receiving member 12, so that the moving-side punch 53 is prevented from advancing through the fixed-side punch 21 and the material A. become.

When the ram 6 further advances in this state, as shown in FIG. 11, the movable die unit 7b
Side slide sleeve 48 is fixed side die unit 5b
24 are pushed into the back of the die housing 13 against the urging force of the spring 27. At this time, these connecting members 24.
The first and second tapered surfaces 24c and 24e on the outer peripheral surface are the first and second tapered surfaces 13 on the inner peripheral surface of the die housing 13.
Guided by c, 13e, the spring 25 shown in FIG.
The diameter is reduced as a whole against the urging force of 25.

As a result, the inner concave / convex surfaces 24a ... 24a of the connecting members 24 ... 24 engage with the outer peripheral concave / convex surfaces 14a, 49a of the fixed and movable die holders 14,49. 49 are mechanically connected, and the cavity formed by the fixed-side and moving-side dies 17, 49 is securely held in a sealed state.

While the two die holders 14, 49 are pushed into the die housing 13 from the state of FIG. 10 to the state of FIG.
3 is prevented from moving, the material A sandwiched between the punches 21 and 53 is removed from the hole 1 in the fixed die holder 13.
8 to the center of the cavity. As shown in the drawing, when the material A is located at the center of the cavity, the auxiliary punch 54 on the moving-side die unit 7b abuts on the rear end of the moving-side punch 53. 53 will be in a state of being advanced integrally with the ram 6.

Here, the operation of the cam mechanism 90 is shown in FIG.
First, in conjunction with the forward movement of the ram 6, the connecting link 80 moves in the direction of arrow A, whereby the cam plate 77 rotates in the direction of arrow A via the lever 78. At this time, the cam action surface X1 of the cam plate 76 from the state of FIG. 5 to the state of FIG.
3 is formed so as not to swing. As a result, the driving lever 73 does not swing, so that the moving die 50 moves forward at the same speed as the forward speed of the ram 6.

Next, from the state shown in FIG. 10 to the state shown in FIG. 11, as the ram 6 further advances, the cam plate 77 also rotates in the direction of arrow a. The cam action surface X2 is formed in a shape that swings the cam follower 83 in the direction of arrow c. As a result, the drive arm 82 rotates the support shaft 72 in the direction indicated by the arrow E, and accordingly, the drive lever 73 moves in the direction indicated by the arrow E. Accordingly, the drive rod 68 also moves in the direction indicated by the arrow E. Will be.

As a result, the pushing speed of the two dies 17 and 50 moving integrally with the slide sleeve 48 into the die housing 13 is 1 / th of the forward speed of the moving punch 53 moving integrally with the ram 6. It becomes 2.

As a result, as shown in FIG. 12, the material A in the cavity is
3, the pressure is evenly applied from both sides, so that a concave portion is well formed on both end surfaces and an arm portion is well formed on the outer peripheral surface. In particular, even when a product having arms protruding radially as in this example is formed and the amount of material flowing is large, the product can be formed well.

As described above, as shown in FIG. 3, an intermediate product B having concave portions B ", B" at both end surfaces and having a plurality of arms B '. After that, the ram 6 is retracted, the two dies 17 and 50 move to the ram 6 side, and a plurality of connecting members 24.
0 is released. When the ram 6 is further retracted, the fixed die 17 moves from the movable die 50.
Are separated from each other, the KO pin 22 is operated, and the intermediate product B is moved through the KO rod 23 and the eject sleeve 19.
Is taken out of the fixed die 17.

Then, the intermediate product B is transferred to the third molding station S3, and the concave portions B ", B" on both end surfaces.
The final product C having a through hole and a through hole C 'in the center
Finished.

As described above, the products C as shown in FIG. 4 are sequentially and continuously manufactured. In particular, according to the above-described configuration, the second molding station is formed only by the forward movement of the ram 6. In S2, the fixed die 17 and the movable die 50 are brought into contact with each other or mechanically connected to each other by the connecting members 24.
A uniform forming operation from both sides of the material A in the cavity by the differential operation of the moving side punch 53 and the moving side punch 53 is performed as a series of operations.

Further, the cam mechanism 9 for performing the differential operation is provided.
0 is a very simple configuration including only the cam plate 77, the driving rod 68, the driving lever 73, and the driving arm 82, and the cam mechanism 90 is operated by a driving means (not shown) for moving the ram 6. By providing the mechanism of the differential operation, the station S2 hardly becomes large or complicated.

As described above, in the multi-stage molding machine 1 in which a plurality of molding stations are provided in parallel, the operation and layout of the adjacent stations are not affected, and the overall size of the molding machine 1 is not increased. The closed forging as described above is performed favorably.

Since the cam mechanism 90 is attached to the ram 6 on the movable die unit 7b side,
The arrangement and operation of the material transfer device provided on the fixed frame 3 for sequentially moving the material from the upstream station to the downstream station is not hindered.

Although the moving speed of the dies 17 and 50 is set to １ ／ of the forward moving speed of the moving punch 53, the dies 1 and 50 can be replaced by cam plates 77 having different cam action surfaces.
The moving speed of 7,50 can be set to an arbitrary speed at a speed lower than the speed of the moving punch 53, and
It is possible to arbitrarily set the timing at which the dice 17 and 50 start the differential.

In the above embodiment, the moving punch 53 is moved integrally with the ram 6 and the moving speed of the dies 17 and 50 is reduced by the cam mechanism 90 interlocked with the ram 6 so as to reduce the moving speed. Although the punch 53 and the dies 17 and 50 are configured to be differential, the moving-side punch 5 is driven by another driving means in connection with this embodiment.
3 and the dies 17 and 50 are made to be differential. This will be described with reference to FIG.

In the following description, the same reference numerals are used for the same elements as those in the above-described embodiment, and the detailed description of the overlapping parts is omitted.

As shown in FIG. 13, a servo motor 100 is provided on the upper surface of the ram front surface portion 6, and the servo motor 100 is provided with a drive shaft 101a driven by the motor 100. A drive gear 101 is mounted on the drive gear 101. Also, the bracket 102
An intermediate gear shaft 103a is rotatably supported between the two (only one is shown). The intermediate gear 103 is attached to the intermediate gear shaft 103a, and the intermediate gear 10
3 and the drive gear 101 are meshed. Further, a sector gear 104 is rotatably supported by the support shaft 72, and the tooth portion 104 a of the sector gear 104 and the above-described intermediate gear 103 are engaged with each other.

With the above configuration, the sector gear 104 rotates via the intermediate gear 103 as the drive gear 101 rotates by driving the servo motor 100. Accordingly, the drive lever 73 attached to the support shaft 72 swings, and the drive rod 68 abutting on the drive lever 73 can be moved back and forth.

As a result, by providing a driving means different from the driving means for driving the ram 6, the driving means can be integrated with the driving rod 68 at a speed lower than the forward speed of the moving-side punch moving integrally with the ram 6. It is possible to arbitrarily and precisely set the pushing speed of the two dies to be moved into the die housing, and it is possible to arbitrarily and easily set the timing at which the two dies start the differential. .

[0075]

As described above, according to the first aspect of the present invention, as a differential-type closed forging device, merely by advancing a moving member such as a ram, contact and joining of fixed and moving dies can be achieved. ,
The punching operation of the fixed side and the moving side punches from both sides of the cavity is continuously performed, and, for example, a product having a concave portion on both end surfaces and a product having a protruding portion on the outer peripheral surface can be preferably and efficiently manufactured. .

In this apparatus, in particular, a differential mechanism for pushing the punch from both sides of the cavity moves the rod member integrally with the slide member and advances the rod member at a lower speed than the moving member. With the cam mechanism, the configuration is extremely simple, and the provision of this differential mechanism avoids a significant increase in the number of components and an increase in the space for arrangement.

If a conventional closed forging device having a knockout mechanism on the moving die side is used, the knockout pin for pushing out the material is changed to a rod member that moves integrally with the slide member, and the device is provided in the device. By replacing the cam plate in the cam mechanism with a cam plate that advances the rod member at a lower speed than the moving member, the above problem can be easily achieved. Therefore, since the cam mechanism is interlocked with the moving member, the sliding member can be advanced at a lower speed than the moving member without using another power source.

Further, by replacing the cam plate in the cam mechanism of this device with a cam plate having a different cam action surface, the moving speed, moving time, stroke and the like of the slide member can be easily changed.

Further, since the cam mechanism for moving the slide member at a lower speed than the moving member is supported by the moving member, when the moving member is retracted, the cam mechanism and the fixed member are moved. There will be spaces between them.

Therefore, when the closed forging apparatus of the present invention is applied to one station of a multi-stage molding machine provided with a plurality of stations as in the second invention, the structure of the entire molding machine becomes significantly complicated. For example, a product having a concave portion on both end surfaces or a product having a protruding portion on the outer peripheral surface without incurring an increase in size and without interfering with the operation of other stations or the transfer of material between stations. Can be continuously manufactured at a good speed at a high speed. In this way, a closed forging apparatus suitable for performing closed forging at a predetermined station of a multi-stage molding machine can be realized. Become.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a multi-stage molding machine according to an embodiment of the present invention.

FIG. 2 is a view showing a shape of a material formed in a first station of the forming machine.

FIG. 3 is a view showing a shape of an intermediate product formed by closed forging at a second station of the molding machine.

FIG. 4 is a view showing a shape of a final product molded at a third station of the molding machine.

FIG. 5 is a partial cross-sectional view of the closed forging device constituting a second station of the molding machine on a fixing member side.

FIG. 6 is a front view of a fixed die unit of the apparatus.

FIG. 7 is an enlarged view of a die connecting member of the same device.

FIG. 8 is a partial sectional view of a closed forging device constituting a second station of the molding machine on a moving member side.

FIG. 9 is a cross-sectional view showing a first state of an operation stroke of the device.

FIG. 10 is a sectional view showing a second state in the same manner.

FIG. 11 is a sectional view showing a third state in the same manner.

FIG. 12 is a sectional view showing a fourth state in the same manner.

FIG. 13 is a cross-sectional view corresponding to FIG. 8 in a form related to the present invention.

FIG. 14 is an explanatory diagram of a differential closed forging.

[Explanation of symbols]

 Reference Signs List 3 fixed member (fixed frame) 6 moving member (ram) 13 die housing 15 first spring member (spring) 17 first die (fixed side die) 21 first punch (fixed side punch) 24 die connecting member 48 slide member ( 48a Push-in portion (front end surface of slide sleeve) 50 Second die (moving-side die) 53 Second punch (moving-side punch) 55 Second spring member (spring) 68 Drive rod (rod member) 73 Drive lever 77 Cam Plate 82 Drive arm 90 Cam mechanism

Claims (2)

[Claims] A first die provided on a fixed member, a second die provided on a moving member that moves forward and backward to face the fixed member and that comes into contact with and separates from the first die;
A fixed side and a movable side first and second punches respectively protruding from both die sides into a cavity formed by contacting these dies, and these are used to form a material into a product having a predetermined shape. In the forging device, the first die is held movably in an axial direction in a die housing provided on a fixed member, and is urged toward a second die by a first spring member. In the die housing, a plurality of die connecting members arranged around the first die and compressed by being pushed into the rear of the housing are housed, while the second die is a moving member. Is attached to a slide member slidably provided in the axial direction, and is urged to the first die side together with the slide member by a second spring member. After the first and second dies come into contact with each other during the forward movement of the moving member, the die connecting member is pushed over the first and second dies by pushing the die connecting member deep into the die housing. A push portion to be engaged is provided, and a rod member that moves integrally with the slide member is disposed behind the slide member in the moving member, and the die connecting member is a first and a second. In a state where the first punch on the fixed member side is fixed to the die and the second punch on the moving member advances integrally with the moving member, the rod member is moved in conjunction with the moving member. A cam mechanism that operates to move the slide member relatively with respect to the moving member via the moving member, and advances the slide member at a lower speed than the moving member. Closed forging equipment. 2. The closed forging apparatus according to claim 1, wherein the forging apparatus is provided in a multi-stage molding machine having a plurality of molding stations to which the material is sequentially supplied, and forms one of the molding stations. .