JP4714334B2 - Punch connection structure and connection method for powder forming press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a powder molding press, and more particularly to a punch connection structure and a connection method for connecting a plurality of punches to a press body.
[0002]
[Prior art]
The present applicant has already installed a plurality of punch actuating devices such as double punches or triple punches on the press body side, and by rotating the upper punch unit relative to the connecting end of the actuating device, Has been proposed (see Japanese Patent Publication No. 7-98279).
[0003]
[Problems to be solved by the invention]
However, the conventional rotary connection method described above has a problem that the connection mechanism is complicated and expensive. In particular, in the case of a small press, the cost of the press main body is low, so a low cost method is required.
In addition, since the rotating punch is attached, the upper punch unit may be twisted due to the tightening torque, and it may take time to adjust the centering.
[0004]
The present invention has been made to solve the above-described problems of the prior art, and the object of the present invention is to provide a punch connection structure for a powder molding press that has a simple connection mechanism and that does not cause a punching of the punch unit. And providing a connection method.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a punch connection structure of a powder forming press according to the present invention comprises a plurality of punches that are concentrically assembled with each other so as to be reciprocally movable in the axial direction. Provided with a plurality of punch actuating means for reciprocating each punch of the unit, and provided with abutting portions that abut against each other in the vertical direction between each punch of the punch unit and the operating end of each punch actuating means, provided fastening means for fastening and fixing between abutting surfaces of the respective abutting portions, but which enables tightening of the side opposite to the punch actuating means all respective clamping means and said punch unit,
The punch unit has a plurality of upper and lower punch plates, and for the adjacent punches, the outer punch is sequentially attached to the lower punch plate and the inner punch is sequentially attached to the upper punch plate. The punch-side abutting portion is provided on the upper surface of the punch plate, and when the abutting portion is located above the punch plate, the abutting portion is provided on the punch plate. The punch unit is protruded upward through the hole, the abutting part on the punch actuating means side is provided on the punch actuating means, and a clamping seat part is provided coaxially with the abutting part on the lower surface of the punch plate, If there is a punch plate below the clamping seat, the punch plate is inserted through the hole provided in the punch plate. A bolt insertion hole through which a bolt as the tightening means is inserted is provided so as to protrude below the base and pass through the tightening seat portion and the abutting portion. A screw hole is provided, and a bolt is inserted into the bolt insertion hole from the tightening seat portion side to be screwed into the screw hole and fixed .
[0007]
A recess is provided at the abutting end surface of the abutting portion on the punch side, and a screw portion of a bolt projects into the recess, and a stopper that engages an opening edge of the bolt insertion hole on the bottom surface of the recess at the base of the screw portion Is preferably provided to support the fastening bolt.
[0008]
The die plate is provided with a punch unit ascending cylinder that supports the upper punch unit, and the punch unit ascending cylinder has a stepped cylinder shaft with a stepped portion that supports each punch plate, and a stepped cylinder shaft during connection work. The abutting end surface of the abutting portion is positioned at a predetermined connection position in a state where the punch plate is supported on each of the step portions.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on the illustrated embodiments.
1 to 6 show a main part of a powder set press of a tool set system to which a punch connection structure and a connection method of a powder forming press according to an embodiment of the present invention are applied. In this embodiment, the present invention is applied to the connection between the upper punch unit 4 of the tool set 1 and the press body.
[0011]
That is, the tool set 1 is assembled with a die 3 having a die hole 2 filled with powder, an upper punch unit 4 press-fitted into the upper and lower openings of the die 3, and a lower punch unit 5.
[0012]
As shown in FIG. 1, the upper punch unit 4 includes first, second, and third upper punches 41, 42, 43 that are assembled concentrically with each other. The third upper punch 43 is located on the innermost side, the second upper punch 42 is fitted on the outer periphery of the third upper punch 43, and the first upper punch 41 slides on the outer periphery of the second upper punch 42. Fits freely. These first, second, and third upper punches 41, 42, and 43 are fixed to first, second, and third upper punch plates 44, 45, and 46, which are arranged above and below, respectively.
[0013]
In each punch, the outermost first upper punch 41 is the lowest first upper punch plate 44, the second second upper punch 42 from the outside is the second second upper punch plate 45 from the bottom, and so on. As for two adjacent upper punches, the outer upper punch is attached to the lower upper punch plate and the inner upper punch is attached to the upper upper punch plate in sequence. The upper upper punch plate 46 is fixed to the upper stage. The first upper punch 41 is fixed to the first upper punch plate 44 via the first upper punch holder 41a, and the second upper punch 42 is fixed to the second upper punch plate 45 via the second upper punch holder 42a. . Further, a hole for passing the inner upper punch is provided in the center of the upper punch plate on the lower stage side.
[0014]
The first, second, and third upper punch plates 44, 45, and 46 are assembled so as to be movable relative to each other up and down via guide bars 47 as four guide shafts arranged at four corners. .
The upper ends of the four guide bars 47 are fixed to the third upper punch plate 46 and inserted into bushes 47a provided on the second upper and first upper punch plates 45, 44, and the lower ends are the die of the lower punch unit 5. The upper punch unit 4 and the lower punch unit 5 are centered by being slidably inserted into a bush 47 a provided on the plate 34.
[0015]
The second and third upper punches 42 and 43 on the center side of the upper punch unit 4 can be extracted together with the second and third upper punch plates 45 and 46, and the second and third upper punches 42. 43 can be easily performed by simply pulling them out from above, and the alignment adjustment with the lower punch unit 5 can be performed very easily from above.
[0016]
On the other hand, the press main body is provided with a pressurizing mechanism section 6 constituting punch operating means for reciprocating each punch of the upper punch unit 4.
The pressurizing mechanism 6 includes a main cylinder 64 fixed to the upper frame 61 of the press body 60, a pressurizing plate 62 driven by the main cylinder 64, and second and third upper punches provided on the pressurizing plate 62. Cylinders 10 and 11. The pressure plate 62 is fixed to the upper frame 61 and is attached to a guide 63 extending downward so as to freely move up and down, and is connected to a cylinder shaft 65 of the main cylinder 64.
The first upper punch 41 is connected to the pressure plate 62, and the second and third upper punches 42 and 43 are connected to the second and third upper punch cylinders 10 and 11, respectively. The upper punch cylinders 10 and 11 constitute punch operating means. The movement of the second and third upper punches 42 and 43 is such that the movement of the second and third upper punch cylinders 10 and 11 is superimposed on the movement of the pressure plate 62 that operates the first punch 41.
A punch cylinder for operating the first upper punch 41 may be separately provided as an auxiliary cylinder. However, even if it is reduced by one as in this embodiment, the second and third upper punches move with respect to the movement of the main cylinder 64. By moving the punches 42 and 43 relative to each other, the same movement as that of moving the first upper punch 41 can be realized.
As shown in FIG. 5, the second and third upper punch cylinders 10 and 11 are arranged in pairs, and each pair of the second and third upper punch cylinders 10 and 11 is the center of the pressure plate 62. Are arranged at symmetrical positions.
[0017]
The second upper punch cylinder 10 is constituted by a reciprocating fluid pressure cylinder, and includes a piston portion 10b inserted into a cylinder chamber 10a into which a working fluid such as pressurized oil or air pressure flows, and the piston portion 10b. And a cylinder rod 10c protruding downward.
The third upper punch cylinder 11 is also constituted by a reciprocating fluid pressure cylinder, and includes a piston portion 11b inserted into the cylinder chamber 11a and a cylinder rod 11c protruding downward from the piston portion 11b. Yes.
[0018]
Between the first, second and third upper punches 41, 42 and 43 of the upper punch unit 4 and the pressure plate 62 as the punch operating means, and the second and third upper punch cylinders 10 and 11, respectively. First, second, and third abutting portions 21, 22, and 23 that are abutted in the vertical direction are provided, and between the abutting surfaces of the first, second, and third abutting portions 21, 22, and 23 are provided. A bolt 24 is provided as a fastening means for fastening and fixing, and the first, second, and third abutting portions 21, 22, and 23 are all fastened to the anti-punch operating means side of the upper punch unit 4, that is, the die plate 34 side. It can be tightened. The abutting surfaces of the first, second, and third abutting portions 21, 22, and 23 are flat surfaces, and can be displaced in a direction orthogonal to the axis of the upper punch unit 4. The lower punch unit 5 The centering can be adjusted.
[0019]
More specifically, the first abutting portion 21 has a first abutment bar 21a which is projected from the first upper punch plate 4 4 top, abutting seat 21b which is projected from the pressure plate 62 lower surface It consists of and. The second, third abutting section 22 and 23, second, second, third abutment bar 22a which is protruded into the third upper punch plate 4 5, 4 6 top, and 23a, the second, third The upper punch cylinders 10 and 11 are constituted by cylinder rods 10c and 11c. Since the first and second butting bars 21a and 22a have the second and third upper punch plates 45 and 46 above, the first and second butting bars 21a and 22a pass through the through holes 21c and 22c provided in the second and third punch plates 45 and 46, respectively. It protrudes above the upper punch unit 4 and abuts against the end faces of the cylinder rods 10c, 11c of the second and third upper punch cylinders 10, 11. These first, second and third butting bars 21a, 21b and 21c are arranged in pairs as shown in FIG. 5, and each pair of first, second and third butting bars 21a, 21 b and 21 c are arranged at symmetrical positions with respect to the center of the third upper punch plate 46. The first abutting bar 21a is arranged corresponding to the first abutting receiving portion 21b provided on the pressure plate 62 (see FIG. 5), and the second abutting bar 21b corresponds to the second upper punch cylinder 10. The third butting bar 21 c is disposed at a position corresponding to the third upper punch cylinder 11.
[0020]
Further, the first, second and third upper punch plates 44, 45, 46 are provided on the lower surfaces thereof at positions corresponding to the first, second, third butting bars 21a, 22a, 23a. , Third fastening seats 25, 26, 27 are provided. The first fastening seat portion 21a is constituted by the lower surface of the first upper punch plate 44, and the second and third fastening seat portions 26 and 27 are provided so as to protrude coaxially with the second and third abutting bars 22a and 23a. Yes. Of these clamping seats 25, 26, 27, the second and third clamping seats 26, 27 pass through holes 26 a, 27 a provided in the first and second punch plates 44, 45, and the upper punch unit 44. Projecting downward.
Furthermore, bolt insertion holes 28,... That pass through the first, second, and third butting bars 21a, 22a, and 23a from the first, second, and third fastening seats 25, 26, and 27 are provided. The bolts 24 are inserted into the respective bolt insertion holes 24a, and the heads thereof are engaged with the seating surfaces of the first, second, and third tightening seats 25, 26, and 27. On the other hand, a threaded hole 29 is provided in each of the butting seat 21b of the pressure plate 62, which is a punch actuating means, the cylinder rod 10c of the second upper punch cylinder 10, and the cylinder rod 11c of the third upper punch cylinder 11. Each bolt 24 is screwed.
[0021]
Concave portions 28a are provided on the end surfaces of the first, second, and third butting bars 21a, 22a, and 23a on the punch side, and screw portions 24a of the bolts 24 protrude into the concave portions 28a. A stopper 24b that engages with the opening edge of the bolt insertion hole 28 on the bottom surface of the recess 28a is attached to the base of the screw portion 24a to prevent the bolt 24 from falling off.
[0022]
The lower punch unit 5 includes a die plate 34 having a die 3 filled with powder, a first lower punch plate 35 disposed below the die plate 34 and holding a first lower punch 51, and a first lower punch A second lower punch plate 36 disposed below the plate 35 and supporting the second lower punch 52, a fixed plate 38 fixed to the frame 66 of the press body 60, and a tie rod 81 disposed below the fixed plate 38. And a pull-down plate 39 connected to the die plate 34 via the. A tie rod 81 is slidably inserted in the first lower punch plate 35 and the second lower punch plate 36. Further, the lower end of the core rod 54 fitted to the inner periphery of the third lower punch 53 is supported by the pull-down plate 39. The pull-down plate 39 is connected to the die plate 34 and is moved up and down by a pull-down cylinder 67. The pulling cylinder 67 is disposed at the lower part of the frame, but may be placed on the fixed plate 38 side.
[0023]
The fixed plate 38 is provided with a second lower punch cylinder 82 for operating the second lower punch plate 35 and a third lower punch cylinder 83 for operating the third lower punch plate 36. Cylinder rods 82a and 83a are connected to the second and third lower punch plates 35 and 36, respectively.
[0024]
Further, on the die plate 34 of the lower punch unit 5, the upper punch unit 4 is lifted from the die plate 34, and the butting bars 21 a, 22 a, 23 a are moved to the pressure plate 62, the second and third upper punch cylinders 10, The upper punch unit ascending cylinders 7 for abutting the 11 cylinder rods 10c, 11c are provided at two locations.
[0025]
The upper punch unit ascending cylinder 7 has a stepped cylinder shaft 71 having stepped portions 71a and 71b for supporting the first and second upper punch plates 44 and 45. The first, second, and third butting bars 21a, 22a, and 23a are connected to each other in a state where the first, second, and third upper punch plates 44, 45, and 46 are supported on the stepped portions 71a and 71b and the shaft tip. The punch unit 4 is lifted in the positioning state in the position-positioned configuration, and is below the cylinder rods 10c and 11c of the first butting seat portion 21b, the second and third upper punch cylinders 10 and 11 on the punch operating means side. It is configured to abut against the end face at the same time. In the illustrated example, the positions of the tip surfaces of the first, second, and third abutting bars 21a, 22a, and 23a are set to the same height, and the cylinders of the second and third upper punch cylinders 10 and 11 are set. The end surfaces of the rods 10c and 11c are set to have the same height as the end surface position of the first butting seat portion 21b.
[0026]
The step portion 71a of the thickest first shaft portion of the stepped cylinder shaft 71 supports the first upper punch plate 44, and the second shaft portion having an intermediate thickness protruding upward from the step portion 71a is the first upper portion. It protrudes upward through the guide hole of the punch plate 44, the step portion 71b at the tip of the second shaft portion supports the second upper punch plate 45, and the thinnest third shaft portion that protrudes further upward from the step portion 71b is the second punch portion. It protrudes upward through the guide hole of the plate 45, and the shaft end supports the third upper punch plate 46.
[0027]
The upper punch unit of the powder molding press having the above configuration is connected as follows.
First, the tool set 1 is mounted in a press body (not shown) (see FIG. 4).
Next, the upper punch unit 4 is raised by the elevating cylinder 7, and the first, second, and third abutting bars 21a of the first, second, and third upper punch plates 44, 45, 46 of the upper punch unit 4, 22 a and 23 a are abutted against the lower ends of the cylinder rods 10 c and 11 c of the first butting seat 21 b of the pressure plate 62 and the second and third upper punch cylinders 10 and 11.
[0028]
At this time, even if there is a misalignment between the cylinder side and the upper punch unit 4, the abutment portions 21, 22, and 23 are separated from the shaft center by the gap between the bolt 24 and the bolt insertion hole 28. Therefore, the misalignment between the cylinder side and the upper punch unit 4 is absorbed, and the upper punch unit 4 and the lower punch unit 5 are not centered.
Next, each bolt 24 is tightened to complete the connection.
Note that the pressurization method on the press body side may be a hydraulic method, or a mechanical operation such as cam or ball screw drive.
[0029]
【The invention's effect】
The present invention has the above-described configuration and operation, and the cost can be reduced by adopting a simple configuration in which the butted portion is abutted up and down and connected.
Further, even if there is a misalignment between the punch unit and the actuating means side, it can be absorbed by the misalignment of the abutting end surface of this abutting portion, and the punch unit will not be centered.
[0030]
Further, if a supporting means for supporting the bolt as the tightening means is provided, it is not necessary to pass the bolt one by one, and workability is improved.
[0031]
Also, a punch unit raising cylinder that supports the punch unit and moves up and down is provided, and the punch unit is raised with the punch plate supported on each step part of the stepped cylinder shaft of this punch unit cylinder and the abutting part positioned. If the configuration is such that the abutting end is abutted simultaneously, the workability is further improved.
[Brief description of the drawings]
FIG. 1 shows a punch connection mechanism of a powder forming press according to an embodiment of the present invention, and is a cross-sectional view taken along the line II of FIG.
FIG. 2 is a plan view of the upper punch unit of FIG.
3 is a cross-sectional view of the upper punch unit of FIG. 1 taken along the line III-III in FIG.
4 is a cross-sectional view of the punch connecting mechanism of FIG. 1 in a state before punch connection.
FIG. 5 is a bottom view of a pressurizing mechanism of the powder molding press of FIG. 1;
6 is an enlarged view of the abutting portion of the connection mechanism of FIG. 1. FIG. 6 (A) is a sectional view of the connected state, and FIG. 6 (B) is a sectional view of the state before the connection. is there.
[Explanation of symbols]
1 Tool Set 3 Die 4 Upper Punch Unit 5 Lower Punch Unit 6 Pressure Mechanism 7 Upper Punch Unit Lifting Cylinder 71 Stepped Cylinder Shafts 71a and 71b Stepped Parts 10 and 11 First and Second Upper Punch Cylinders (Punch Actuating Means)
10c, 11c Cylinder rods 21, 22, 23 First, second and third butting portions 21a, 22a and 23a First, second and third butting bars 24 Bolts 25, 26 and 27 First, second and second Third clamping seat 28 Bolt insertion hole 28a Recess 29 Screw hole 34 Die plates 41, 42, 43 First, second and third upper punches 44, 45, 46 First, second and third punch plates 60 Press body 61 Upper frame 62 Pressure plate

Claims (3)

A punch unit is constructed by assembling a plurality of punches concentrically with each other so that they can reciprocate in the axial direction.
A plurality of punch actuating means for reciprocating the punches of the punch unit are provided on the press body side, and abutting portions that are abutted in the vertical direction are provided between the punches of the punch unit and the punch actuating means. In addition, a clamping means for clamping and fixing between the abutting surfaces of each abutting portion is provided, and each of the clamping means can be clamped from the opposite side to the punch operating means of the punch unit ,
The punch unit has a plurality of punch plates arranged vertically, and for adjacent punches, an outer punch is sequentially attached to a lower punch plate, an inner punch is sequentially attached to an upper punch plate, and the punch Assemble the plate movably up and down along the guide axis,
The abutting portion on the punch side is provided on the upper surface of the punch plate, and the abutting portion protrudes above the punch unit through a through hole provided in the punch plate when there is a punch plate above,
The abutting portion on the punch actuating means side is provided in the punch actuating means,
A clamping seat is provided on the lower surface of the punch plate coaxially with the abutment, and when there is a punch plate below the clamping seat, it projects below the punch unit through a through hole provided in the punch plate. Let
A bolt insertion hole through which a bolt as the tightening means is inserted is provided so as to penetrate the tightening seat portion and the abutting portion, while a screw hole is provided in the abutting end surface of the punch actuating means,
A punch connection structure of a powder molding press, wherein a bolt is inserted into the bolt insertion hole from the tightening seat portion side and screwed into the screw hole. A recess is provided at the abutting end surface of the abutting portion on the punch side, and a screw portion of a bolt projects into the recess, and a stopper that engages an opening edge of the bolt insertion hole on the bottom surface of the recess at the base of the screw portion is provided, punch connection structure of the powder molding press according to claim 1 which has a configuration for supporting the bolt. The die plate is provided with a punch unit raising cylinder for supporting the upper punch unit, and the punch unit raising cylinder has a stepped cylinder shaft provided with a step portion for supporting each punch plate,
The powder molding press according to claim 2 , wherein the abutting end surface of the abutting portion is positioned at a predetermined connecting position while the punch plate is supported on each step portion of the stepped cylinder shaft at the time of connection work. Punch connection structure.

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