JP2006142308A - Stabilizer of drawing die, and stabilizer unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the cost of a stabilizer of a drawing die by easily manufacturing it through standardizing it. <P>SOLUTION: In the drawing die for drawing a thin plate using a punch and the drawing die by gripping the thin plate 51 by means of a blank holder 3 and the die 7, a plurality of boxes 5 are arranged around the blank holder and between cushion pins 4 and the blank holder so as to be vertically moved by means of the cushion pins, and approach-run gaps of the blank holder are provided between the boxes and the blank holder via cushion gas springs 11 arranged between the boxes and the blank holder, and approach-run levers 13 are swivelably provided in the boxes to push and make the blank holder move in the approach-run before the die has come into contact with the thin plate put on the blank holder, and drivers 31 for driving the approach-run levers are arranged at the position of the die facing to the approach-run levers, and the die is brought into contact with the thin plate put on the blank holder after the approach-run of the blank holder. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a diaphragm type stabilizer and its stabilizer unit.

  The aperture type is shown in FIG.

  The drawing die includes a punch 101 positioned at the center, a blank holder 103 that is fitted on the punch 101 and supported by a cushion pin 102 so as to be movable up and down, and a die 104 that faces the punch 101 and moves up and down. And more. Reference numeral 105 denotes an air vent.

  A lower die 109 consisting of a punch 101 and a blank holder 103 is fixed to a bolster 106 of a press machine, and an upper die 110 consisting of a die 104 is fixed to a ram 107 of a press machine. When the press machine is driven, the upper die 110 is Go up and down. Moreover, the blank holder 103 is supported by the cushion pin 102, and the cushion pin 102 is raised and lowered by the cushion device of the press machine, and the blank holder 103 is also raised and lowered accordingly.

  Explaining the drawing process, first, the blank holder 103 is raised by the cushion pin 102 to the position indicated by the two-dot chain line.

  Next, the thin plate 108 is placed on the blank holder 103 and the punch 101 as indicated by a two-dot chain line.

  Thereafter, when the upper die 110 is lowered, the die 104 abuts on the thin plate 108 on the blank holder 103 on the entire outer periphery of the punch 101, and the thin plate 108 is sandwiched between the blank holder 103 and the die 104. Subsequently, when the upper mold 110 is lowered, the thin plate 108 sandwiched between the blank holder 103 and the die 104 is squeezed by the punch 101, and when the upper mold 110 reaches the bottom dead center shown in the drawing, the workpiece W is formed.

  When the upper mold 110 is raised, the blank holder 103 is raised to the state of the two-dot chain line by the raising force of the cushion pin 102, and the workpiece W is removed from the punch 101. In the upper mold 110, the air vent 105 is provided in the die 104 so as to avoid a negative pressure between the work W and the die 104 when the work W falls due to its own weight. Alternatively, the work W is moved downward by a push pin (not shown) biased by a spring to remove the work W from the die 104, and the work W taken out from the press machine is sent to the press machine in the next process.

In the above drawing process, when the die 104 collides with the thin plate 108 placed on the blank holder 103, the thin plate 108 (that is, the thin plate 108 on the blank holder 103) and the die 104 over the entire outer periphery of the punch 101 are formed. In order to touch at the same time and to process at a stroke, it was necessary to use a high-quality thin plate that could withstand it. In addition, the life of the press die and the press machine has been shortened due to impact processing.
Japanese Patent No. 2928227

  Even if a low-quality processed material is used, it is required that the same molded product as when a high-quality processed material is used can be processed, and the cost of the product can be reduced.

  In the drawing die, a large impact is generated when the die collides with the thin plate on the blank holder. However, in order to extend the life of the drawing die and the press machine, it is required to reduce this impact as much as possible.

  If the aperture-type stabilizer is standardized, it will be easier to manufacture and reduce costs.

  In addition, when drawing, intense noise is generated when the upper die and the lower die meet.

  Furthermore, when the blank holder is completely lifted by drawing, the workpiece is vibrated on the blank holder.

  Therefore, in view of the above circumstances, the present invention reduces the impact generated by the drawing die as much as possible, and even if a low-quality work material is used, a molded product similar to that when a high-quality work material is used is obtained. In order to reduce the cost of the product, extend the life of the drawing die and press machine, standardize the drawing type stabilizer so that manufacturing is easy, and remove the punch and punch to reduce the cost. It is composed of a blank holder that is fitted and supported by a cushion pin so that it can move up and down, and a die that is placed opposite to the punch and moves up and down. A thin plate is placed on the blank holder raised by the cushion pin, and the die is lowered. In a drawing die that sandwiches a thin plate with a blank holder and a die and draws the thin plate with a punch, the blank holder is placed between the cushion pin and the blank holder. A plurality of boxes are arranged in a row so that the box can be moved up and down by a cushion pin, and a buffer gas spring is interposed between the box and the blank holder to provide a running clearance for the blank holder between the box and the blank holder. The box has a pivoting lever that allows the box holder to press the blank holder before it collides with the thin plate on the blank holder. Then, after the blank holder was run up, a die-type stabilizer was adopted in which the die collided with a thin plate on the blank holder.

  In addition, the present invention is specifically a diaphragm type stabilizer having a cam surface with an inclination angle that changes the speed.

  Furthermore, in order to facilitate the improvement of the existing drawing type, the present invention provides a drawing type stabilizer unit that is attached to a box and a die, and a blank holder is run up and then brought into contact with the box.

  Furthermore, in order to facilitate the improvement of the existing aperture type, the present invention provides an aperture type stabilizer unit having a run-up lever and a driver for driving the run-up lever.

  The present invention comprises a punch, a blank holder that is externally fitted to the punch and supported by a cushion pin so as to be movable up and down, and a die that is disposed opposite to the punch and moves up and down. In a drawing die that places a thin plate on the die, lowers the die, sandwiches the thin plate with the blank holder and the die, and draws the thin plate with a punch, there are a plurality of pieces around the blank holder between the cushion pin and the blank holder. Place the box so that it can be moved up and down with a cushion pin, insert a buffer gas spring between the box and the blank holder, and provide a blanking space for the blank holder between the box and the blank holder. Press the blank holder before hitting the thin plate on the blank holder A run-up lever that can be rotated is installed, and a driver that drives the run-up lever is placed at a position facing the run-up lever of the die, so that the blank holder will run against the thin plate on the blank holder after the run-up. Because it is a mold stabilizer, the impact generated by the drawing die is reduced as much as possible, and even if a low-quality processed material is used, the same molded product as when using a high-quality processed material can be processed. Cost reduction, extending the life of the drawing die and press machine, and standardizing the drawing type stabilizer makes it easy to manufacture and can reduce the cost.

  Further, the present invention is a diaphragm type stabilizer having an inclined cam surface that changes the speed, and can control the speed of the blank holder for running.

  Furthermore, the present invention is a drawing type stabilizer unit that is attached to a box and a die, and has a blank holder run up and then brought into contact with the box, so that the existing drawing type can be easily improved. . If the stabilizer unit is standardized, it will be easier to manufacture the drawing die and reduce costs.

  Furthermore, since the present invention is a diaphragm type stabilizer unit having a running lever and a driver that drives the running lever, it is possible to easily improve the existing diaphragm type. If the stabilizer unit is standardized, it will be easier to manufacture the drawing die and reduce costs.

  According to the present invention, since the die collides with the thin plate on the run-up blank holder, noise can be reduced.

  In the present invention, the blank holder that has been drawn by the stabilizer unit is gradually raised, so that the vibration of the workpiece on the blank holder can be reduced.

  The present invention will be described in detail below based on a specific embodiment shown in the accompanying drawings.

  In FIG. 1, the lower mold 1 includes a punch 2, a blank holder 3 that is externally fitted to the punch 2 and provided so as to be movable up and down by a cushion pin 4, and a cushion pin 4 that is also externally fitted to the punch 2 and around the blank holder 3. And a plurality of boxes 5 supported by each other.

  Conventionally, an annular single-piece sub-blank holder fitted on the punch 2 has been used. However, if the sub-blank holder is used, the drawing die becomes large and the cost is too high. Therefore, in the present invention, a plurality of standardized boxes 5 are arranged around the punch 2 below the blank holder 3 only at necessary places. The required number is determined depending on the size of the aperture die, but usually 4 to 6 are arranged.

  The upper die 6 is composed of a die 7 disposed to face the punch 2.

Between the lower mold 1 in box 5 and the blank holder 3 a gap which is interposed a buffer gas spring 11 float the blank holder 3 on the box 5 to the gap between the run-up clearance H _1. The buffer gas spring 11 is screwed into the box 5 with a bolt 8.

  The buffer gas spring 11 uses a gas pressure / hydraulic cylinder, and the stroke and output of the piston 12 are determined according to the throttle type. This buffer gas spring 11 is also standardized. Normally, the output of one cushion pin 4 is about 100 tons, but the output of one buffer gas spring 11 is 6 tons and the stroke is about 15 mm.

  Further, a substantially triangular running lever 13 for pushing the blank holder 3 for running is provided on the bracket 14 so as to be rotatable. The bracket 14 is fixed to the box 5 with a bolt 15, and the positioning groove 16 is provided to make the mounting position of the bracket 14 accurate.

  An aperture type stabilizer unit is provided which is attached to the box 5 and the die 7 and makes the blank holder 3 run up and then abuts with the box 5. An example is illustrated.

  The run-up lever 13 is rotatably provided around a rotation shaft 17 provided on the bracket 14 and presses the flange 18 of the blank holder 3. A cured pressing member 20 is provided on the pressing surface 19 of the running lever 13, and a cured pressure receiving member 9 is provided at the flange 18 where the pressing member 20 abuts.

  A roller 21 is rotatably provided at the upper portion of the run-up lever 13, and a roller 22 is rotatably provided around the rotation shaft 47 at a position facing the roller 21 of the bracket 14.

  A driver 31 is provided at a position of the die 7 facing between the roller 21 and the roller 22. The driver 31 is attached to the die 7 via a support base 32. The support base 32 is screwed to the die 7 by bolts 33 and the driver 31 is screwed to the die 7 by bolts 34. The driver 31 and the support base 32 may be manufactured as an integrated object.

  The driver 31 has a low-speed inclination angle α close to a right angle to a portion that contacts the initial roller 21 when the upper die 6 descends, and has a cam surface 35 that is continuously provided with a medium-speed inclination angle β. The continuous portion of the inclination angle α and the medium speed inclination angle β is smoothly connected with an arc. The descending speed of the run-up lever 13 and the descending speed of the blank holder 3 can be controlled by changing the low-speed inclination angle α and the medium-speed inclination angle β of the driver 31.

  FIG. 2 shows a side view of the aperture type stabilizer of FIG.

  An appropriate number of blocks 5 are arranged around the punch 2 in the lower part of the blank holder 3 and standardized, and can be moved up and down by cushion pins 4.

  A bracket 14 is fixed to the block 5 with bolts 15, and side plates 41 are arranged on both outer sides of the bracket 14, and the side plates 41 are screwed to the flange 18 of the blank holder 3 with bolts 42 and bolts 43.

  A rotating shaft 17 is passed through the proximal end of the running lever 13, and the proximal end portion of the running lever 13 is accommodated in the bracket 14, and both ends of the rotating shaft 17 are inserted through the long holes 44 of the side plate 41, respectively, and a washer 45. Are screwed with bolts 46.

  The roller 22 is rotatably provided around the rotation shaft 47 and accommodated at the upper part of the bracket 14, both ends of the rotation shaft 47 are supported by the bracket 14, and both end surfaces are stopped by a stop plate 48. 49 is screwed to the bracket 14.

The buffer gas spring 11 is screwed to the block 5 by a bolt 8, and its piston 50 comes into contact with the lower surface of the flange 18 of the blank holder 3, and the flange 18 of the blank holder 3 is moved from the upper surface of the block 5 by the output of the buffer gas spring 11. For example, the running clearance H _{1 of} 15 mm is lifted.

  Next, the operation will be described.

  The thin plate 51 is placed on the punch 2 and the blank holder 3.

FIG. 1 shows a state in which the upper die 6 is lowered and the driving lever 13 starts to come into contact with the flange 18 of the blank holder 3 by the driver 31. The operation start gap H ₂ between the blank holder 3 and the die 7 in FIG. 1 is set larger than the run-up gap H ₁ so that the blank holder 3 abuts the block 5 after the run-up. Run-up clearance H ₁ and the operation starting gap H _2, the relationship between the run-up clearance H ₁ and the operation starting gap H ₂ (or operation starting gap H ₂ what extent greater than the run-up clearance H ₁₎ is to avoid shocking processing Set it enough.

The blank holder 3 is made to run by the run-up lever 13, presses the piston 50 of the buffer gas spring 11, the lower surface of the flange 18 of the blank holder 3 comes into contact with the upper surface of the block 5, and then the die 7 is placed on the thin plate 51 of the blank holder 3. Abut. This state is shown in FIG. For example, when H ₁ = 15 mm, the run-down lever 13 descends 15 mm at the contact portion of the blank holder 3 with the flange 18, and H ₁ = 0 mm. The die 7 comes into contact with the thin plate 41 of the running blank holder 3, not the stationary blank holder 3. Since the die 7 does not collide with the stationary thin plate 51, but the die 7 comes into contact with the running thin plate 51, almost no impact is generated.

  Thereafter, the upper die 6 continues to descend, and the drawing is completed in the state of the bottom dead center shown in FIG. In the case of this example, the cushion pin 4 is lowered by 65 mm.

  When the upper die 6 is raised, the workpiece W is removed from the punch 2 by the blank holder 3, and the air vent 52 is provided in the die 7, and when the workpiece W falls by its own weight, the pressure between the workpiece W and the die 7 becomes negative. Avoid becoming. Alternatively, the workpiece W is discharged out of the die 7 by an extrusion pin (not shown) biased by a spring.

  The block 5, the run-up lever 13, the bracket 14, the driver 31, etc. (including the roller 21, roller 22, the rotating shaft 17, the buffer gas spring 11, and the support base 32) are provided as standardized parts depending on the size. In this case, the existing aperture type can be easily changed to a buffer structure.

  According to the present invention, standardized drawing type stabilizer parts such as blocks are provided, so that any drawing type can easily provide a buffer structure, and even if low quality processed materials are used, high quality The same molded product as when using the processed material can be processed, and the cost of the product can be reduced.

  Further, according to the present invention, since the die collides with the thin plate on the run-up blank holder, noise can be reduced.

  Furthermore, in the present invention, the blank holder that has been drawn by the stabilizer unit is gradually raised, so that the vibration of the workpiece on the blank holder can be reduced.

  Although the present invention has been described with respect to a drawing die, it can also be used with a forming die.

  The size of the block is 150 mm × 275 mm × height 120 mm.

It is a longitudinal cross-sectional view of the principal part which shows the state which the action | operation of the run-up lever of this invention started. It is a side view of the aperture type stabilizer of FIG. It is the longitudinal cross-sectional view of the principal part which shows the state which the blank holder of this invention started and the die | dye joined to the thin plate on a blank holder after contacting a block. FIG. 4 is a longitudinal sectional view of a main part showing a state of a bottom dead center in which the upper die is further lowered from the state of FIG. It is a longitudinal cross-sectional view of the conventional aperture type.

Explanation of symbols

2 ... Punch 4 ... Cushion pin 3 ... Blank holder 51 ... Thin plate 5 ... Box 11 ... Buffer gas spring H ₁ ... Running clearance 13 ... Running lever 31 ... Driver 35 ... Cam surface

Claims (4)

  A thin plate is placed on the blank holder that is lifted by the cushion pin. In a drawing die that lowers the die, pinches the thin plate with the blank holder and the die, and draws the thin plate with a punch, a plurality of boxes are arranged around the blank holder between the cushion pin and the blank holder. The box can be moved up and down by a cushion pin, a buffer gas spring is interposed between the box and the blank holder to provide a run-up clearance of the blank holder between the box and the blank holder, and the die is on the blank holder. Press the blank holder to run before hitting the thin plate A run-off lever is installed, and a driver that drives the run-up lever is placed at a position facing the run-up lever of the die. After the run-up of the blank holder, the die collides with the thin plate on the blank holder. stabilizer.   2. The aperture type stabilizer according to claim 1, wherein the driver has a cam surface having an inclination angle for changing the speed.   A diaphragm-type stabilizer unit attached to the box and die of claim 1, wherein the blank holder is run up and then brought into contact with the box. 4. A diaphragm type stabilizer unit according to claim 3, further comprising a run-up lever and a driver for driving the run-up lever.

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