JP5515797B2 - Die for press - Google Patents

Description

  The present invention relates to a press mold, and more particularly to a positioning mechanism for a workpiece to be pressed.

  Conventionally, in this type of press mold, after the primary positioning, a conical first position adjusting pin and a conical or polygonal pyramid second position adjusting pin are projected from the mold to be formed in advance on the workpiece. In some cases, the first position adjusting pin round hole and the second position adjusting pin oblong hole are respectively fitted to position the workpiece. (For example, refer to Patent Document 1.)

JP 2006-224105 A

  However, the positioning accuracy is affected by the gap between the hole formed in the workpiece in advance and the position adjustment pin. To increase the positioning accuracy, the gap must be reduced and the workpiece will not move away from the mold during workpiece advance. There is a problem that “payment failure” occurs.

  In view of the above-described problems, an object of the present invention is to provide a press die that does not have defective workpiece paying while ensuring high positioning accuracy.

In order to solve the above-described problem, the first problem solving means includes a positioning pin that is evenly divided by a plurality of planes passing through the shaft center and is fitted into the lower mold with the divided surfaces in close contact, and a vertical position of the positioning pin. A pressing die having an upper die having a pressing member that contacts the upper end portion in the direction and presses the positioning pin downward in the vertical direction, wherein the upper die is lowered and the pressing member is moved to the positioning pin. Is pushed down a predetermined distance, a cam mechanism provided on the bottom portion of the positioning pin and the lower mold separates the dividing surface of the positioning pin, and the positioning pin is uniformly expanded in diameter, thereby positioning the workpiece to be pressed. close contact the positioning pin into the hole, the circular hole is formed having an axis extending in the vertical direction in the lower mold, the first annular member is the circular hole having a tapered inner bore whose diameter increases vertically downwardly A positioning portion of the positioning pin that is inserted into the circular hole and has a second annular member having a tapered inner hole whose diameter is reduced downward in the vertical direction is inserted into the circular hole below the first annular member. A taper portion that is formed below and expands downward in the vertical direction is in close contact with the tapered inner hole of the first annular member, and the tapered portion of the positioning pin is connected to the tapered inner hole of the first annular member. A first urging member for urging the positioning pin vertically upward to be in close contact with the lower die, and the cam mechanism is formed in a tapered hole formed in a bottom portion of the positioning pin and the lower die. The cam member is provided with a cam pin that is urged upward in the vertical direction by the second urging member, and the pressing member that is urged downward in the vertical direction by the third urging member when the upper die is lowered is positioned. Pin predetermined When depressing the release, the positioning pin the cam pin into the tapered hole is spaced apart is the divided surface of the positioning pin contacts are press mold to uniformly expanded.

According to the first problem solving means, when the workpiece is fed forward and the positioning pin is inserted into the positioning hole of the workpiece, the outer diameter of the positioning pin is smaller than the diameter of the positioning hole of the workpiece, and the workpiece is set in the lower mold. When the upper pressing member lowers the positioning pin, the positioning pin is uniformly expanded in diameter and the positioning pin is brought into close contact with the positioning hole of the workpiece, so that the workpiece is positioned with high accuracy and the workpiece is not defective. In addition, since the cam mechanism is configured by the taper hole and the cam pin drilled in the bottom of the positioning pin, and the positioning pin is enlarged by the cam mechanism, a highly accurate positioning mechanism can be obtained with a simple structure and at a low cost. .

It is sectional drawing which shows the positioning mechanism of the press metal mold | die which concerns on embodiment of this invention. It is a projection view of the positioning pin which concerns on embodiment of this invention. It is A arrow line view in FIG. It is an action | operation figure of the metal mold | die for press which concerns on embodiment of this invention. It is an action | operation figure of the metal mold | die for press which concerns on embodiment of this invention. It is an action | operation figure of the metal mold | die for press which concerns on embodiment of this invention. It is an action | operation figure of the metal mold | die for press which concerns on embodiment of this invention.

  Hereinafter, a press die according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a first lower mold 11, a second lower mold 12, and a third lower mold 13 are stacked and fixed to each other by bolts (not shown) or the like to form a lower mold 10. The first lower mold 11, the second lower mold 12, and the third lower mold 13 are each manufactured by processing and heat-treating a steel material such as tool steel.

  A circular hole (circular hole) 11a having an axial center extending in the vertical direction is formed in the first lower mold 11, and a first annular member 21 having a tapered inner hole 21a whose diameter is expanded downward in the vertical direction is a circular hole 11a. It is inserted in. A flange 21b is formed at the bottom of the first annular member 21, and the flange 21b engages with an annular groove 11b formed at the bottom of the first lower mold 11, so that the first lower mold of the first annular member 21 is engaged. 11 is prevented from coming off.

  A circular hole (circular hole) 12a having an axial center extending in the vertical direction is formed in the second lower mold 12, and a second annular member 22 having a tapered inner hole 22a whose diameter is reduced downward in the vertical direction is a circular hole 12a. It is inserted in. A flange 22b is formed at the bottom of the second annular member 22, and the flange 22b engages with an annular groove 12b formed at the bottom of the second lower mold 11, so that the second lower mold of the second annular member 22 is engaged. Omission from 12 is prevented.

  The third lower mold 13 includes a bottomed circular hole 13a, a circular hole 13b below the bottomed circular hole 13a, and a bottomed circular hole 13c having an inner diameter larger than that of the circular hole 13b. A stepped cylindrical cam pin (cam mechanism) 14 is fitted into the bottom circular hole 13c. The cam pin 14 is urged upward in the vertical direction by the second spring (second urging member) 52, but the flange portion 14b abuts against the bottom portion 13c1 of the bottomed circular hole 13c and moves upward in the vertical direction. Is regulated. Further, the second spring is prevented from falling off from the third lower mold 13 by the lid member 13 d fixed to the bottom surface of the third lower mold 13.

  As shown in FIG. 2 and FIG. 3, the positioning pin 31 is equally divided by three planes intersecting at its axis, and the divided surface 31h is brought into close contact with each other by the tapered inner hole 21a and the tapered inner hole 22a. Abacus ball-shaped space to be formed (an internal space formed by abutting the end portions of the first annular member 21 and the second annular member 22 on the side where the opening area is large, and the central portion of the internal space is It is disposed in a space having a shape in which the volume decreases with increasing thickness toward the end. In the present embodiment, the positioning pin 31 is equally divided into three parts. However, the present invention is not limited to this, and if it is divided at an equal angle on the plane of FIG. Good.

  The positioning pin 31 has an upper end portion 31a with which a push pin 16 of the upper mold 15 described later contacts, and a first taper portion that expands in diameter as the distance from the upper end portion 31a increases and guides the insertion of the workpiece 61 into the positioning hole 61a. 31b, a positioning portion 31c that uniformly expands in diameter and comes into close contact with the positioning hole of the workpiece during pressing, and a second tapered portion (tapered portion) that expands in the vertical direction downward (in FIG. 1) from the lower end of the positioning portion 31c 31d, a third taper portion 31e extending in the vertical direction downward from the lower end of the second taper portion 31d, and a taper hole (cam mechanism) drilled in the bottom 31f of the third taper portion 31e and having a diameter in the vertical direction upward. ) 31g.

  As shown in FIG. 1, a first spring (first urging member) 51 is disposed in the bottomed circular hole 13 a of the third lower mold 13, and abuts against the bottom 31 f of the positioning pin 31 to position the positioning pin 31. Is biased vertically upward. Due to this urging force, the second tapered portion 31d of the positioning pin 31 contacts the tapered inner hole 21a of the first annular member 21, the divided surface 31h of the positioning pin 31 is brought into close contact, and the positioning portion 31c and the like are reduced in diameter most. It is in a state. At this time, the radial gap between the positioning portion 31c and the positioning hole 61a of the workpiece 61 is C1 (FIG. 4).

  As shown in FIG. 1, a circular hole 13b and a bottomed circular hole 13c having an inner diameter larger than the circular hole 13b are formed below the bottomed circular hole 13a of the third lower mold 13, and the circular hole 13b, the circular hole 13c, A stepped cylindrical cam pin (cam mechanism) 14 is fitted into the base. The cam pin 14 is urged upward in the vertical direction by a second spring (second urging member) 52, but the flange portion 14b abuts against the bottom portion 13c1 of the circular hole 13c, and the upward movement in the vertical direction is restricted. Has been. A cam portion 14 a having a spherical tip is integrally formed above the flange portion 14 b of the cam pin 14. A cam mechanism is formed by the tapered hole 31g of the positioning pin 31 and the cam pin 14 described above.

As shown in FIG. 1, the upper die 15 is formed with a circular hole 15a and a circular hole 15b having a larger inner diameter than the circular hole 15a. A stepped cylindrical push pin (pressing member) is formed in the circular hole 15a and the circular hole 15b. ) 16 is inserted. The push pin 16 is urged downward in the vertical direction by the third spring (third urging member) 53, but the flange portion 16b abuts against the bottom portion 15b1 of the circular hole 15b, so that the downward movement in the vertical direction is performed. It is regulated. The third spring is prevented from falling off from the upper die 15 by the lid member 15c fixed to the upper surface of the upper die 15. The set loads of the first spring 51, the second spring 52, and the third spring 53 are respectively F1. , F2 and F3, F1 <F2 <F3 is set.

  When the push pin 16 of the upper die 15 is not in contact with the upper end portion 31a of the positioning pin 31 (FIGS. 1 and 4), a predetermined gap is provided between the spherical cam portion 14a and the tapered hole 31g. C2 is formed.

  In the press mold of this embodiment, the lower mold 10 has a three-part structure, but the lower mold 10 has an integral structure, and the first annular member 21 and the second annular member 22 are fitted into the circular holes. The stopper may be used to prevent it from coming off.

  Next, the operation of the press mold according to this embodiment will be described.

  Normally, in press work, the work is rarely completed by a single press operation, and progressive feeding is performed in which the work is moved sequentially and the mold is changed to gradually increase the work degree. At that time, positioning is required so that the workpiece does not deviate from the mold.

  FIG. 4 shows a state in which the workpiece 61 is moved and the positioning hole 61 a of the workpiece 61 is fitted into the next positioning pin 31. In this state, the diameter of the positioning hole 61a is sufficiently larger than the outer diameter of the positioning pin 31 (radius gap C1), and the positioning hole 61a is fitted into the positioning pin 31 without being twisted.

  When the upper die 15 is lowered, the push pin 16 comes into contact with the upper end portion 31a of the positioning pin 31, and the upper die 15 is further lowered, the first spring 51 having the smallest set load starts to bend. When the positioning pin 31 is lowered by a predetermined distance, a gap (C4) is formed between the second tapered portion 31d of the positioning pin 31 and the tapered inner hole 21a of the first annular member 21, and a tapered hole 31g of the positioning pin 31 is formed. The tapered surface abuts on the spherical cam portion 14a of the cam pin 14, the taper hole 31g is expanded by the cam portion 14a, and the dividing surface 31h of the positioning pin 31 is separated. That is, the diameter of the positioning portion 31c of the positioning pin 31 is uniformly increased, and the positioning portion 31c and the positioning hole 61a of the workpiece 61 are in close contact with each other (5).

  When the positioning pin 31 is further lowered, the second spring 52 starts to bend, the third tapered portion 31e of the positioning pin 31 comes into contact with the tapered inner hole 22a of the second annular member 22, and the lowering of the positioning pin 31 is stopped. The positioning pin 31 is automatically aligned and fixed at a predetermined position of the lower mold 10 (FIG. 6).

  When the upper die 15 is further lowered, the third spring 53 having the largest set load starts to bend, and finally, the upper die 15 starts to contact the work 61 and is pressed at a predetermined portion (not shown) of the die (FIG. 7). ).

  When the press work is finished, the upper die 15 starts to rise and reverses the above-described operation to return to the state shown in FIG. 4 so that the work 61 is ready for the next press work (for example, to the right in FIG. 4). The positioning hole 61a is fitted into the adjacent positioning pin by being moved.

  According to this embodiment, when the workpiece 61 is fed forward and the positioning pin 31 is inserted into the positioning hole 61a of the workpiece 61, the outer diameter of the positioning pin 31 is smaller than the diameter of the positioning hole 61a of the workpiece 61, and the workpiece 61 is When the push pin 16 of the upper die 15 is set on the lower die 10 and the positioning pin 31 is lowered, the positioning pin 31 is uniformly expanded in diameter, and the positioning pin 31 comes into close contact with the positioning hole 61a of the workpiece 61. The workpiece 61 is positioned and no defective payment of the workpiece 61 occurs.

  Further, since the cam mechanism is constituted by the tapered hole 31g formed in the bottom 31f of the positioning pin 31 and the spherical cam portion 14a of the cam pin 14, and the positioning pin 31 is expanded in diameter by the cam mechanism, a highly accurate positioning is achieved. The mechanism is simple and can be obtained at low cost.

10 Lower mold 11a, 12a Circular hole 14 Cam pin (cam mechanism)
15 Upper mold 16 Push pin (Pressing member)
21 First annular member 21a Tapered inner hole 22 Second annular member 22a Tapered inner hole 31 Positioning pin 31c Positioning portion 31d Second tapered portion (tapered portion)
31g taper hole (cam mechanism)
31h Dividing surface 51 First spring (first urging member)
52 Second spring (second biasing member)
53 Third spring (third biasing member)
61 Workpiece 61a Positioning hole

Claims (1)

A positioning pin that is evenly divided by a plurality of planes passing through the shaft center and is fitted into the lower mold with the divided surface closely attached;
A pressing die comprising an upper die having a pressing member that contacts the vertical upper end of the positioning pin and presses the positioning pin downward in the vertical direction;
When the upper die is lowered and the pressing member pushes the positioning pin a predetermined distance,
A cam mechanism provided on the bottom portion of the positioning pin and the lower mold separates the split surface of the positioning pin so that the positioning pin is uniformly expanded in diameter, and the positioning pin is inserted into the positioning hole of the workpiece to be pressed. close contact,
A circular hole having an axial center extending in the vertical direction is formed in the lower mold,
A first annular member having a tapered inner hole that expands downward in the vertical direction is fitted into the circular hole,
A second annular member having a tapered inner hole whose diameter is reduced downward in the vertical direction is fitted into the circular hole below the first annular member;
A tapered portion formed below the positioning portion of the positioning pin corresponding to the positioning hole of the workpiece and expanding in the vertical direction downward is in close contact with the tapered inner hole of the first annular member,
A first urging member for urging the positioning pin vertically upward is disposed in the lower mold in order to bring the tapered portion of the positioning pin into close contact with the tapered inner hole of the first annular member;
The cam mechanism comprises a tapered hole formed in the bottom of the positioning pin and a cam pin provided in the lower mold and urged upward in the vertical direction by the second urging member,
When the pressing member urged downward in the vertical direction by the third urging member as the upper die descends pushes down the positioning pin for a predetermined distance, the cam pin comes into contact with the tapered hole and the positioning pin A pressing mold in which the dividing surface is separated and the positioning pin is uniformly expanded in diameter .

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