JPH0315276Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention moves a rod-shaped workpiece inserted into a die whose opening faces upward by reversing the feed screw in the forward and backward directions using the friction transmission force of the drive unit. This invention relates to a centering device for a die and a punch in 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 13 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 the holding member 93 of the die holding device 86.

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 part having a large diameter part of the same type as 94a at one end, such as an engine valve or a bolt.

On the other hand, the frame 81 is suspended from the feed screw 66, and the upper plate 82 and the bottom plate 83 of the frame 81 are suspended from the feed screw 66.
The projecting pieces 82a and 83a provided on each side of the main body 61 are brought into contact with the guide plates 95 and 96 of the pillars 62 and 63 of the main body 61 to be guided. The guide of the frame 81 is relatively rough, and the axis 97 of the die 94 is shifted in the lateral or front-back direction and is difficult to match with the axis 98 of the punch 91.

(Problem to be Solved by the Invention) The punch 91 has a convex portion or a concave portion formed on the lower surface, and there are cases where an uneven portion is formed on the head of the workpiece in the die 94. In such a case, the punch 91
If the axes of the die 94 and the die 94 are misaligned, defective products will be produced after pressing.

Conventionally, in order to align the axis 98 of the punch 91 with the axis 97 of the die 94, the die 94 is brought into actual contact with the punch 91, and the screwing amount of each fixing screw 92 is adjusted. It was difficult to align the punch.

Further, 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.

(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 reverse by the frictional conduction 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, the bottom plate of the frame body is equipped with a frame body that can be raised and lowered, and the upper plate has a top plate and a bottom plate on the upper and lower sides of the holding plate, and the upper plate is screwed to the feed screw. A plurality of guide posts whose bases are fixed to a fixed lower die set, an upper die set into which the upper ends of the guide posts are loosely inserted and attached to the lower surface of the retaining plate of the main body, and a plurality of guide posts whose bases are fixed to a fixed lower die set, and a plurality of guide posts whose bases are fixed to a fixed lower die set; A punch whose upper surface abuts against the lower surface of the upper holder via bucking, and a lower surface abuts the lower holder fixed on the lower die set via buckling, and the upper surface abuts against the punch when the frame rises. a tubular tapered ring that fits on the outer periphery of the punch and die, has a tapered part on the outer periphery with a tapered free end, and has a slit-shaped cut part parallel to the axis; It is fitted onto the ring 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 part of the tapered ring, and is fastened to the upper die set and the lower die set. Accordingly, the present invention is characterized in that it includes a clamp cap that holds the punch and die to the upper die set and the lower die set via a tapered ring.

(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 locked to a step 7b provided on the outer periphery of the receiving member 7. The flange 8 is attached to the receiving member 7 so as to be able to rise as appropriate.

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 lower part of the abutment member 13, which has a hemispherical protrusion 13a with a small gap from the hemispherical protrusion 13a, 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. As shown in FIG. 3, the outer periphery of the punch 18 whose upper surface is in contact with the backing 16 has a tapered part 19a with a tapered free end on the outer periphery, and a slit-shaped cut parallel to the axis. A tapered ring 19 partially cut off at the portion 19b is fitted.

A clamp cap 21 that fits into the outer periphery of the backing 16 and the tapered ring 19 and has an inward protrusion 21a on the inner peripheral surface of the free end that forms a tapered hole that can come into contact with the tapered part 19a of the tapered ring 19. By pressing the punch 18 against the upper holder 12 using the plurality of fastening members 20, the punch 18 is tightened by the taper ring 19 and fixed at a predetermined position on the upper holder 12 at right angles.

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 20.
By pressing the lower holder 22 with
The die 24 is tightened with a tapered ring 19 and fixed to the lower holder 22.

As the fastening member 20, a commercially available product is used that simultaneously performs a fastening action when fluid is supplied at the same time. By fastening the clamp cap 21 without tilting it using this fastener 20, the punch 18 and die 24 are fixed so that their axes are perpendicular to the upper and lower die sets 5, 1. Then, the upper and lower holders 12, 22
Since the axes of the backings 16 and 23 are set in advance on one axis, the axes of the punch 18 and the die 24 can be aligned in a straight line by simply tightening the clamp cap 19.

A relatively strong spring 25 is fitted into each guide post 4, and its base is in contact with the upper surface of the lower die set 1. are located a distance apart.

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 collision, the heated portion of the workpiece is pressed by the punch centered with the die 24, and
It is pressed to have the same shape.

(Effects of the invention) According to the invention, after fitting the taper ring and clamp cap onto the punch and die, the punch and die can be assembled by simply tightening the clamp caps to the upper and lower die sets, respectively.
Each axis can be accurately centered on one axis and easily mounted on the upper and lower die sets, which is very convenient.

[Brief explanation of the drawing]

Fig. 1 is a front view taken longitudinally of the main part of a centering device in a friction press machine showing an embodiment of the present invention, Fig. 2 is a side view of the above device taken longitudinally of the main part, and Fig. 3 is , a perspective view of a taper ring, 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 a conventional punch holding device and die holding device taken longitudinally. 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, 19a...
...Tapered portion, 19b...Slit-shaped cut portion, 21
...Clamp cap, 21a...Protrusion, 22...
... lower holder, 23 ... bucking, 24 ... die, 25 ... spring, 61 ... main body, 62, 63 ...
...Strut, 64...Top plate, 65...Holding plate, 66...
...Feed screw, 67...Driven wheel, 68, 69...Bearing, 71...Shaft, 72, 73...Motive wheel, 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, 92... Fixing screw, 93... Holding member, 94... Die, 95, 96... Guide plate, 97, 98... Axis core.

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 which can be raised and lowered and whose upper plate is screwed onto the feed screw, and a plurality of guide posts whose bases are fixed to a lower die set which is fixed to the bottom plate of the frame body; , an upper die set into which the upper end of the guide post is loosely inserted and which is attached to the lower surface of the holding plate of the main body, and a punch whose upper surface is in contact with the lower surface of the upper holder fixed to the lower part of the upper die set via buckling. , a die whose lower surface abuts the lower holder fixed on the lower die set via bucking, and whose upper surface abuts the punch when the frame is raised; A tubular tapered ring having a tapered portion on the outer periphery and a slit-shaped cut portion parallel to the axis; It has an inward protrusion that forms a tapered hole that can come into contact with the tapered part of the tapered ring, and is fastened to the upper die set and the lower die set, so that the punch and die can be connected to the upper die set and the lower die set through the tapered ring. A centering device for a friction press machine, characterized in that it is equipped with a clamp cap for holding the centering device in a friction press machine.