JPH0312475Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention moves a rod-shaped workpiece inserted into a die with an upward opening into a position above the die by reversing the feed screw using the friction transmission force of the motor vehicle. The present invention relates to a die setting device for a friction press machine, which forms a workpiece into a desired shape by colliding with a stationary punch.

(Prior Art) An example of a conventional friction press machine will be explained based on FIG. 4.

The gate-shaped main body 61 is composed of left and right pillars 62, 63, an upper plate 64 fixed to the upper part thereof, and a retaining plate 65 fixed laterally to the middle part. The upper and lower parts of the feed screw 66 are connected to the upper plate 64 and the retaining plate 6.
A conical driven wheel 67 whose small diameter portion faces upward is fixed to the upper part of the feed screw 66 which is pivotally connected to the feed screw 66 and protrudes from the upper plate 64.

Conical motive wheels 72 and 73 with small diameter portions facing each other are fixed to a shaft 71 that is slidably pivoted to bearings 68 and 69 fixed to the upper plate 64, and both motive wheels 72 , 73 peripheral surfaces 72a, 73a
is normally separated from the circumferential surface of the driven wheel 67.

Both motive wheels 72 and 73 are rotated in one direction by a drive unit such as a motor 75 connected via a belt transmission device 74. A shifter 76 connected to one end of the shaft 71 and a lever 77 integrated therewith.
is an operating rod 7 which is mounted on a bracket 78 fixed to the upper plate 64 and is linked to a lever 77.
By moving the shaft 9 up and down, the shaft 71 moves left and right, and when the driving wheel 72 contacts the driven wheel 67, the feed screw 66 rotates in the normal direction, and when the driving wheel 73 contacts it, the feed screw 66 rotates in the reverse direction.

The frame body 81 includes upper plates 8 on the upper and lower sides of the holding plate 65.
The frame body 81 is made up of two bottom plates 83 and a column 84 connecting them, and the top plate 82 is screwed into a feed screw 66, and the frame 81 is moved up and down by forward and reverse rotation of the feed screw 66.

A punch holding device 85 is attached to the lower surface of the holding plate 65, and a die holding device 86 is attached to the bottom plate 83 of the frame body 81.

In FIG. 5, the holding member 87 is suspended from the lower surface of the holding plate 65 by a bolt 89 that is inserted through a flange 88 that is integral with the holding member 87. Holding member 8
A punch 9 is inserted into the recess 87a provided at the bottom of the punch 9.
1 are fitted with a relatively large gap,
The punch 91 is fixed to the holding member 87 by pressing the inner ends of a plurality of fixing screws 92 screwed onto the circumferential surface of the holding member 87 against the circumferential surface of the punch 91.

A die 94 having a shaped hole 94a opening upward is attached to a holding member 93 of the die holding device.

A rod-shaped workpiece (not shown) with one end heated,
The workpiece is inserted into the die 94 with the heating part facing upward, and the feed screw 66 is rotated in the normal direction, and the frame 81 is rapidly raised to bring the die 94 into contact with the punch 91. It is processed into a press part, such as an engine valve or a bolt, having a large diameter part of the same type as the hole 94a formed at one end.

The frame 81 is suspended from the feed screw 66, and the projecting pieces 82a and 83a provided on each side of the top plate 82 and bottom plate 83 of the frame 81 are connected to the main body 61.
The guide plates 95 and 96 of the support columns 62 and 63 contact and guide the support columns 62 and 63, respectively.

Since the frame body 81 is suspended from the feed screw 66 as described above, the upper surface of the bottom plate 83 of the frame body 81 and the lower surface of the holding plate 65 are usually not parallel to each other. The holding member 87 of the punch 91 is attached to the holding plate 6
5, the pressing surface 91a of the punch 91 is not parallel to the upper surface 94b of the die 94,
There is a problem that the thickness of the large diameter part of the engine valve after processing becomes uneven. Conventionally, a sheet-like spacer is placed at a suitable position in the pressure contact portion 99 between the die holding device 86 and the bottom plate 83, and the upper surface 94b of the die 94 and the punch 9 are connected to each other.
Although parallelism with the pressing surface 91a of No. 1 was also sought, adjusting this parallelism was extremely troublesome.

Abutment surfaces 94b and 9 between the die 94 and the punch 91
In order to make the parts 1a parallel, a die 94 and a plurality of guide posts are fixed to a lower die set (described later) fixed to the upper surface of the bottom plate 83 of the frame 81, and an upper die set fixed to the lower surface of the holding plate 65 of the main body 61. A conceivable method is to fix the punch 91 to the lower surface of the holder and to fit a guide post into the lower surface of the holder. Furthermore, the holding plate 65 of the main body 61 and the bottom plate 83 of the frame body 81
In order to prevent a bending load from acting on the guide post due to a parallelism error, a receiving member having an uneven surface and an abutting member that is appropriately inclined and pressed against the receiving member are arranged between the holding plate and the upper die set. There are ways to think about it.

(Problem to be solved by the invention) However, when the die 94 and punch 91 collide,
If there is a gap between the abutting member and the receiving member, the abutting member will collide with the receiving member with a large impact force, which may cause the receiving member to crack.
It is desirable to bring the abutment member into close contact with the receiving member before the abutment with the receiving member.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has a gate-shaped main body in which a horizontal upper plate and a holding plate are fixed to the upper and lower parts, respectively, and a drive unit. a feed screw having a driven wheel at its upper end that can be rotated forward and backward by the frictional transmission force of a pair of driving wheels rotated in one direction by the screw, and whose upper and lower parts are pivotally connected to the main body and the holding plate, respectively; In a friction press machine, a workpiece is inserted from above in a friction press machine, which is equipped with a frame body that can be raised and lowered and has a top plate and a bottom plate on the upper and lower sides of the holding plate, respectively, and the upper plate is screwed to the feed screw. a lower die set having a die on the upper part and fixed to the upper surface of the bottom plate of the frame; a receiving member fixed to the lower surface of the holding plate and having a downward hemispherical recess at the lower end; An upper die set is suspended below so that it can be raised slightly and tilted in any direction, and a punch is attached to the lower surface of the die set. A contact member having a hemispherical convex portion that can be pressed into contact with a spherical concave portion of the member; a plurality of guide posts whose base portions are fixed to the lower die set and whose upper portions are slidably inserted into the upper die set; and a lower portion. A compression coil spring that is fitted onto each guide post between the die set and the upper die set, and whose total length under no load is smaller than the distance between the lower die set and the upper die set when the lower die set is lowered. It is characterized by the fact that it is equipped with

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Components having the same functions as those in the conventional example are given the same reference numerals, and their explanations will be omitted.

In FIGS. 1 and 2, the lower die set 1 is fixed to the upper part of the bottom plate 83 by bolts 2 and nuts 3 whose bases are locked to the bottom plate 83 of the frame. The bases of a plurality of guide posts 4 are fixed to the left and right front and back of the upper surface of the lower die set 1, and the upper ends of the guide posts 4 are loosely inserted into guide members 6 fixed to the lower surface of the upper die set 5.

The small diameter portion 7a of the receiving member 7 is fitted onto the lower surface side of the holding plate 65 of the main body, and is fixed to the holding plate 65 with appropriate bolts (not shown). A flange 8 is loosely inserted into the outer periphery of the receiving member 7, and an inward protrusion 8a provided on the upper part of the flange 8 is inserted into the outer periphery of the receiving member 7.
The flange 8 is attached to the receiving member 7 in such a manner that it can be raised appropriately by being engaged with a stepped portion 7b provided on the outer periphery of the receiving member 7.

The upper die set 5 connects the base to the upper die set 5.
The upper part of the die set is suspended from the flange 8 by a bolt 11 which is fixed to the flange 8 by a nut 9, and an appropriate gap is provided between the lower surface of the flange 8 and the upper surface of the upper die set 5. ing.

An upward step 5a is formed in the center of the upper die set 5, and a flange 12a provided at the upper part of the upper holder 12 is in contact with this step 5a. The upper holder 12 is made of a wear-resistant material and is fixed to the upper die set 5.

A hemispherical recess 7c that opens downward is formed in the lower part of the receiving member 7. This recess 7
The base of the abutment member 13, which has a hemispherical protrusion 13a with a small gap from the support member 7, is engaged with the head of a screw 14 screwed into the receiving member 7. Abutment member 13
A hole 15 with a gap between it and the screw 14 is bored in the center of the hole 15 . Therefore, the abutting member 13 can be tilted by a small amount in any direction.

A buckling 16 is fixed to the lower surface of the upper holder 12 with screws 17. The outer periphery of the punch 18, whose upper surface is in contact with the bucking 16, has a tapered portion on the outer periphery with a tapered free end.
In addition, a partially cut taper ring 19 is fitted.

A clamp cap 21 is fitted onto the outer periphery of the backing 16 and the tapered ring 19, and has an inward protrusion on the inner circumferential surface of the free end that forms a tapered hole that can come into contact with the tapered portion 19a of the tapered ring 19. , the upper holder 1 is connected by a plurality of fastening members 20.
2, the punch 18 is fixed to the upper holder 12.

Lower holder 22 fitted to lower die set 1
The base of the bucking 23 is fitted into the
A die 42 having a shaped hole 24a opening upward is abutted on the upper surface of the bucking 23.
Similar to the attachment of the punch 18 to the upper holder 12 described above, the taper ring 19 fitted to the outer periphery of the die 24 and the clamp cap 21 fitted to the outer periphery of the buckling 23 are attached to the plurality of fastening members 2.
The die 24 is fixed to the lower holder 22 by being pressed against the lower holder 22 by the screw 0.

Each guide post 4 is equipped with a compression coil spring (hereinafter simply referred to as a spring) which has relatively strong elasticity and whose total length under no load is smaller than the distance between the lower die set and the upper die set when the lower die set is lowered. ) 25 are respectively fitted, the bases of which are in contact with the upper surface of the lower die set 1, and the upper ends of the springs 25 are located at a suitable distance from the lower surface of the guide member 6.

Now, when a rod-shaped workpiece (not shown) heated at one end is inserted into the die 24 with the heated part facing upward, and the frame 81 (see FIG. 4) is raised,
The lower die set 1 rises and the die 24 abuts against the lower surface 18a of the punch 18. During this abutment, the heated portion of the workpiece is pressed by the punch so that it has the same shape as the hole 24b of the die 24.

When the lower surface of the holding plate 65 of the main body 61 and the upper surface of the bottom plate 83 of the frame body 81 are not parallel, the frame body 8
1 rises, before the die 24 collides with the punch 18, as shown in FIG. 6a and push up the upper die set 5.

At the same time, the upper surface of the upper holder 12 of the upper die set 5 abuts the lower surface of the abutment member 13, and the abutment member 13 is tilted so that the lower surface of the abutment member 13 coincides with the upper surface of the upper holder. In this state, the hemispherical upper surface 13a of the abutment member 13
abuts against and presses against the hemispherical recess 7c of the receiving member 7.

In this way, by bringing the abutting member 13 into pressure contact with the receiving member 72 before the die 24 abuts against the punch 18, when the die 24 and the punch 18 abut, the abutting member 13 and the receiving member 7 and damage to both members 7 and 13 due to this is prevented. And abutment member 1
3 and the receiving member 7 have a hemispherical shape, regardless of the appropriate inclination of the abutment member 13, the pressing of both members 7, 13 is uniformly performed over the entire hemispherical surface, resulting in a stable The workpiece is pressed.

(Effects of the invention) According to the invention, even if there is a slight deviation in the parallelism between the holding plate of the main body and the bottom plate of the frame, the upper die set will be aligned with the holding plate when the die and punch collide. In a slightly inclined state, the hemispherical convex portion of the abutment member presses against the hemispherical concave portion of the receiving member, absorbing the deviation in parallelism between the upper die set and the retaining plate, and thus guiding the lower die set up and down. The bending load is no longer applied to the guide post, which prevents the guide post from being bent or broken, and the upper die set and lower die set always remain parallel and can be opened and closed smoothly. , it is possible to perform proper pressing without any deviations.

Furthermore, according to the present invention, by providing a compression coil spring of a required length between the lower die set and the upper die set, the urging force of the compression coil spring is applied to the receiving member before the die and the punch collide. The receiving member and the abutment member come into pressure contact with each other, and it is possible to prevent the receiving member and the abutment member from being damaged due to a collision when the die and the punch collide.

[Brief explanation of the drawing]

FIG. 1 is a front view taken longitudinally of the main parts of a die setting device in a friction press machine showing an embodiment of the present invention, FIG. 2 is a side view of the said apparatus taken longitudinally of the main parts, and FIG. Fig. 1 is an operational view of the device, Fig. 4 is a front view showing an example of a conventional friction press machine, and Fig. 5 is a front view of the right half of the conventional punch holding device and die holding device taken vertically. It is. 1... Lower die set, 2... Bolt, 3...
Nut, 4...Guide post, 5...Upper die set, 6...Guide member, 7...Receiving member, 7c
... recess, 8 ... flange, 9 ... nut, 11
... Nut, 12 ... Upper holder, 13 ... Abutment member, 13a ... Convex portion, 14 ... Bolt, 15 ...
...hole, 16...butting, 17...bolt, 1
8... Punch, 19... Taper ring, 21...
Clamp cap, 22... Lower holder, 23...
...batsking, 24...die, 25...spring, 6
1... Main body, 62, 63... Support, 64... Top plate, 65... Holding plate, 66... Feed screw, 67...
... Driven wheel, 68, 69 ... Bearing, 71 ... Shaft, 7
2, 73...Motor vehicle, 74...Belt transmission device,
75... Motor, 76... Shifter, 79... Operating rod, 81... Frame, 82... Top plate, 83... Bottom plate, 84... Pillar, 85... Punch support device, 86
...Die holding device, 87...Holding member, 88...
Flange, 89... Bolt, 91... Punch, 9
2... Fixing screw, 93... Holding member, 94... Die, 95, 96... Guide plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A gate-shaped main body consisting of a horizontal upper plate and a holding plate fixed to the upper and lower parts, respectively, and a friction transmission force of a pair of motive wheels rotated in one direction by a drive unit. , having a driven wheel that can be rotated in forward and reverse directions at the upper end, a feed screw whose upper and lower parts are pivotally connected to the main body and the holding plate, respectively, and an upper plate and a bottom plate on the upper and lower sides of the holding plate, respectively; A friction press machine is equipped with a frame body that can be raised and lowered and whose upper plate is screwed onto the feed screw, and has a die in the upper part into which the workpiece is inserted from above, and is fixed to the upper surface of the bottom plate of the frame body. a lower die set, a receiving member fixed to the lower surface of the holding plate and having a downward hemispherical recess at its lower end; an upper die set that is suspended and has a punch attached to its lower surface; and a hemispherical convex portion that is provided between the upper surface of the upper die set and the lower surface of the receiving member and that can be brought into pressure contact with the spherical concave portion of the receiving member at the upper end. a stopper member, a plurality of guide posts whose bases are fixed to the lower die set and whose upper parts are slidably inserted into the upper die set, and which are fitted onto each guide post between the lower die set and the upper die set, and A die setting device for a friction press machine, comprising a compression coil spring whose total length when unloaded is smaller than the distance between the lower die set and the upper die set when the lower die set is lowered.