JPH0354817Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a cutting device that cuts press plate materials into blank-shaped workpieces using upper and lower cutting blades, and in particular relates to improvements in the conveyance structure of press plate materials, etc. be.

(Prior Art) Conventionally, when press-forming various panel parts that make up the body of an automobile, for example, before the press-forming process, a press plate material brought in as a coil material is shaped into a blank shape according to the shape of the part. It is common practice to cut the work piece into small pieces.

Conventionally, as a cutting device for cutting press plate materials into blank-shaped workpieces, a plurality of pairs of cutting blades facing each other between the upper and lower dies of the press device are arranged at intervals in the conveyance direction of the press plate material. At the same time, the interval between the pair of cutting blades can be adjusted to increase or decrease, and the press plate material on the lower die is cut into blank-shaped workpieces by the downward movement of the upper die accompanying the pressing operation of the press device, and the blank-shaped workpieces are cut into blank-shaped workpieces. There are known devices in which the size, shape, etc. can be changed.

(Problem to be solved by the invention) By the way, in this type of cutting device, a ball caster is normally used to load and convey the press plate material or blank-shaped work, and this ball caster is used to cut the ball caster into a pantograph shape on the upper surface of the lower die. By attaching it to a number of connected links, the above-mentioned links are moved in response to changes in the interval between the lower mold cutting blades (a pair of cutting blades between the upper and lower molds), and the spacing between each ball caster is changed. ing.

However, in the case of the above structure, when the lower die cutting edge is adjusted in position in a V-shape, that is, in a non-parallel state, the ball caster arrangement density between the two cutting edges becomes denser in the narrow space. , it becomes rough in wide areas, and there is a difference in placement density between the two.
As a result, in areas where the spacing between the cutting blades is wide and the ball casters are arranged sparsely, there will be insufficient support points for the press plate material, and the workpiece may get caught in the lower die or the height of the ball caster may become too high. There was a problem in that the workpiece fell below the level and hit the lower die cutting edge, making it difficult to carry out the workpiece.

The present invention was devised to solve this problem, and its purpose is basically to create a chain in which a number of ball casters are stretched over the upper surface of the lower die to support the above-mentioned press plate materials and blank-shaped workpieces. By attaching the ball casters to each other, even if the lower die cutting edge is adjusted to a non-parallel position due to changes in the shape of the blank workpiece, the arrangement density of the ball casters between the two cutting edges can be maintained approximately constant. The objective is to make it possible to carry out blank workpieces smoothly.

(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention is such that, as explained above, the pair of cutting blades facing each other between the upper and lower dies are moved back and forth in the conveying direction of the press plate material. In a cutting device that cuts a press plate material into a blank-shaped workpiece by a pressing operation of an upper and lower mold, the cutting blades are arranged at intervals and the interval between the pairs of cutting blades is adjustable. A roller chain having ball casters attached at approximately equal intervals is stretched in the front-rear direction in a state that the roller chain is submerged below each of the lower die cutting blades, and a tension applying means is provided to apply a constant tension to the roller chain. Further, a chain holding plate to which a sprocket that engages with the roller chain is attached is slidably engaged with both sides of each lower die cutting blade in the front and rear directions and movable back and forth together with the lower die cutting blade, and the chain holding plate A holding plate biasing means is provided for biasing the holding plate upward so that the roller chain on its upper surface is positioned above the cutting edge surface of the lower die. On the other hand, the upper mold is provided with a holding plate holder facing the lower mold holding plate for lowering the chain holding plate against the urging force of the holding plate urging means before the cutting blade cuts the press plate material. do.

(Function) With the above configuration, in the present invention, when the upper mold is in the raised position, each chain holding plate engaged with the lower mold cutting edge is urged upward by the holding plate urging means. The roller chain on its upper surface is located at a higher position than the cutting edge surface of the lower die, and in this state, the press plate material slides on the ball caster of the roller chain and is carried above the cutting edge of the lower die. After the press plate material is carried in, when the upper die is lowered by the press operation, first, the holding plate holder provided on the upper die presses the chain holding plate via the press plate material and the roller chain to hold it as above. The press plate material is lowered against the biasing force of the plate biasing means, and then the press plate material is cut into blank-shaped workpieces by the upper die cutting blade and the lower die cutting blade opposing the upper die cutting blade. At this time, the roller chain stretched over the upper surface of the lower mold is always applied with a substantially constant tension by the tension applying means, so even if the chain holding plate is lowered, the roller chain remains on the upper surface of the lower mold. There is no relaxation.

After cutting this press plate material, when the upper die rises,
The pressure exerted by the holding plate presser is released, and the chain holding plate is raised by the urging force of the holding plate urging means, and the roller chain on its upper surface is positioned higher than the cutting edge surface of the lower die together with the cut blank workpiece. , and the workpiece is carried out in this state.

Then, due to changes in the size and shape of the blank workpiece, the distance between the pair of opposing cutting blades between the upper and lower dies,
In other words, if the interval between the lower die cutting edges is adjusted,
Following the movement of the lower mold cutting blade, the chain holding plate moves while moving the sprocket on the roller chain, and the portion of the roller chain that slips under the lower mold cutting blade changes. For this reason, even when the lower die cutting edges are adjusted to a non-parallel state, the length of the roller chain between the cutting edges becomes longer and the number of ball casters increases at locations where the spacing between the cutting edges is wide. At locations where the spacing between the cutting blades is narrow, the roller chain between the cutting blades becomes shorter and the number of ball casters decreases, and the arrangement density of the ball casters between the lower mold cutting blades is always kept approximately constant. Therefore, since the blank-shaped workpiece is supported by ball casters arranged at approximately constant intervals, it is possible to prevent the blank-shaped workpiece from getting caught by the lower die, lower die cutting blade, etc.

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

FIG. 1 schematically shows a press board cutting device according to an embodiment of the present invention, in which 1 is a lower die of the press;
Reference numeral 2 denotes an upper die which is disposed oppositely above the lower die 1 and moves up and down by the pressing operation of a press device, and between these two dies 1 and 2 is a press plate material W made of a coil material.
is transported to the right in the figure. Recesses 1a and 2a are formed on the upper surface of the lower mold 1 and the lower surface of the upper mold 2, respectively, and the bottom surface of the recess 1a of the lower mold 1 is formed on both the left and right sides with respect to the transport direction of the press plate material W. Rack parts 3, 3 (only the one on the left side in the conveyance direction is shown in the figure) are formed that extend in parallel.

Between the lower die 1 and the upper die 2, a pair of front and rear guide posts 4, 4 extending in the vertical direction are provided at positions corresponding to the respective racks 3 of the recess 1a of the lower die 1 for conveying the press plate material W. The upper end of each guide post 4 is connected to the recess 2 of the upper mold 2.
It is supported to be slidable on the ceiling part a and horizontally movable in the conveying direction of the press plate material W, while at the lower end, as shown in enlarged detail in FIG. Gear 5 meshing with part 3
is attached to be rotatable around the axis of the guide post 4, and the distance between the two guide posts 4, 4 in the conveyance direction of the press plate material W is adjusted by moving them back and forth while keeping them in a vertical state. It is configured.

In addition, guide posts 4 corresponding to the left and right on the front and rear sides of the press plate material W in the conveying direction, respectively,
4, between the lower ends facing into the recess 1a of the lower die 1, there is a lower die cutting blade 6 having a cutting edge tip 6a extending in the horizontal direction slightly longer than the width of the press plate material W on the upper surface. In addition, between the upper end portions facing into the recess 2a of the upper die 2, a cutting edge tip 7a extending in the horizontal direction is provided on the lower surface to cut the press plate material W with the cutting edge tip 6a of the lower die cutting edge 6. The upper die cutting blades 7 are each horizontally suspended, and each of the lower die cutting blades 6 is integrally fixed to the guide post 4. On the other hand, each upper die cutting blade 7 is slidably and loosely fitted to the guide post 4, and is supported by a spring 8 disposed around the guide post 4 between its lower surface and the upper surface of the lower die cutting blade 6. Therefore, it is elastically supported in a floating state with respect to the lower mold cutting edge 6. Therefore, a pair of upper die cutting blades 7 and lower die cutting blades 6 facing each other between the upper and lower dies 2 and 1 are arranged with an interval 1 in the front and rear directions in the conveyance direction of the press plate material W, and the cutting blades 7, 6 can be adjusted by moving the guide posts 4, 4, and each upper die cutting blade 7 is lowered against the elastic force of the spring 8 by the press operation of the upper and lower dies 2, 1. The cutting edge tip 7a of the lower mold cutting edge 6 and the cutting edge tip 6a of the lower die cutting edge 6 are configured to cut the press plate material W into a blank-shaped workpiece W'.

Further, on the upper surface of the lower die 1, at a portion approximately corresponding to both ends in the width direction of the press plate material W to be conveyed,
Two roller chains 9, 9 (only the left one is shown in the figure) extending parallel to each other in the front-rear direction slip under each of the lower die cutting blades 6 and are tensioned with both ends fixed to the lower die 1. It is set up. On each side of each roller chain 9, as shown in enlarged detail in FIG.
... are attached at approximately equal intervals in the conveyance direction of the press plate material W.

Further, on both sides of each of the lower die cutting blades 6 in the front and rear direction, chain holding plates 11, 11 are provided which correspond approximately to the space between the roller chains 9, 9, and are slidable in the vertical direction with respect to the lower die cutting blade 6. The lower mold cutting blade 6 is engaged with the lower mold cutting blade 6 by a dovetail joint or the like so as to be movable back and forth. A pair of upper and lower sprockets 12, 12 are attached to support the sprockets in a direction that allows them to be submerged below the sprockets 6.

A roller 13 is mounted on the lower surface of each chain holding plate 11 via a rubber damper 14, and supports the holding plate 11 on the lower mold 1 by rolling on the bottom of the recess 1a on the side of the rack part 3 of the lower mold 1. The damper 14 urges the chain holding plate 11 upward so that the roller chain 9 on its upper surface is located above the surface of the cutting blade tip 6a of the lower die cutting blade 6.

On the other hand, the upper die cutting blade 7 that descends integrally with the upper die 2 when the upper die 2 moves downward includes a plate retainer 15 facing the chain holding plates 11, 11,
15 is integrally attached so that it is located below the cutting blade tip 7a, and each holding plate presser 15 allows each of the press plate materials W to be press cut by the upper die cutting blade 7 and the lower die cutting blade 6. The chain holding plates 11, 11 are moved against the urging force of the damper 14 as the holding plate urging means, so that the roller chain 9 on the upper surface of the chain holding plate 11 is lower than the surface of the cutting blade tip 6a of the lower die cutting blade 6. lower it to position.

Further, on the upper surface of the lower mold 1 other than the recessed portion 1a, there is a sprocket 1 that engages with each of the roller chains 9.
6, 16, ... are springs 17, 1, respectively.
The sprocket 18 is elastically supported in an upwardly biased state by the springs 7, . The roller chain 9 is elastically supported in a biased state, and the tension applying means 20 is configured to apply a constant tension to the roller chain 9 by the spring force of each of these springs 17 and 19.

In FIG. 1, reference numeral 21 indicates a sprocket 16 on the lower surface of the upper mold 2 in order to move a predetermined sprocket 16, which engages with the roller chain 9 on the upper surface of the lower mold 1, downward against the spring force of the spring 17 when the upper mold 2 moves downward. This is the attached sprocket holder.

Next, the operation in the above embodiment will be explained.
When the upper mold 2 is in the raised position, as shown in the figure,
Each chain holding plate 11 engaged with the side surface of each lower mold cutting edge 6 is in a raised position due to the biasing force of the damper 14, and the roller chain 9 on the upper surface thereof
is located above the surface of the cutting edge tip 6a of the lower die cutting edge 6. Further, each upper mold cutting blade 7 and the holding plate pressers 15, 15 integrated with the upper mold cutting blade 7 are supported in a floating state on the left and right guide posts 4, 4 while being separated from the ceiling surface of the recess 2a of the upper mold 2. has been done.

Then, in this state, the press plate material W made of coil material is carried between the upper and lower dies 2, 1 with both ends in its width direction supported by the ball casters 10, 10, . . . of the left and right roller chains 9, 9, and When the press plate material W is positioned at a predetermined position between each of the upper die cutting blades 7 and the lower die cutting blades 6, the upper die 2 is lowered by the pressing operation of the press device. With this downward movement of the upper mold 2, each of the upper mold cutting blades 7 and the holding plate pressers 15, 15 in the floating state are moved to the recessed part of the upper mold 2.
a When each holding plate presser 15 comes into contact with the press plate W by touching the ceiling surface and lowering together with the upper mold 2 while contracting the spring 8, the chain holding plate corresponding to each holding plate presser 15 The plate 11 is pushed down against the urging force of the damper 14. Also, before and after the holding plate presser 15 presses down the chain holding plate 11, each sprocket presser 21 of the upper mold 2 presses down each sprocket 16 on the upper surface of the lower mold 1 via the press plate W. As each of the chain holding plates 11 moves downward, the roller chain 9 on its upper surface and the press plate material W supported by the roller chain 9 are lowered below the surface of the cutting blade tip 6a of the lower die cutting blade 6. At the same time, each of the upper die cutting blades 7 presses the press plate material W between the corresponding lower die cutting blade 6, and the press plate material W is pressed by the cutting edge tips 7a, 6a of both cutting blades 7, 6. is cut into a blank shape into a workpiece W′.

At that time, each sprocket holder 21 of the upper die 2
Each roller chain 9 on the upper surface of the lower mold 1 tends to loosen due to the downward movement of the sprocket 16 by the sprocket 18, which is elastically supported by a spring 19 below each of the lower mold cutting blades 6. Since the chain 9 is urged downward by the lower cutting edge 6, the chain 9 is pushed downward by a length corresponding to the slack mentioned above.
As it is drawn downward, only the chain 9 below the lower mold cutting edge 6 is bent downward. As a result, press plate material W and blank workpiece
It is possible to prevent slack from occurring in the roller chain 9 that supports W'.

After cutting the press plate material W in this way, the upper die 2 rises, and each upper die cutting blade 7 and the holding plate pressers 15, 15 rise due to the biasing force of the spring 8, and the above-mentioned holding plate pressers 15 move upward. As a result, the pressing down on the chain holding plates 11 is released, and each chain holding plate 11 is raised by the biasing force of the damper 14. This upward movement of the holding plate 11 causes the roller chain 9 on its upper surface to return to its original position higher than the surface of the cutting blade tip 6a of the lower die cutting blade 6, thereby lowering the press plate material W and the workpiece W'. It is held at a higher position than the die cutting edge 6. Furthermore, as the upper mold 2 moves upward, the sprockets 16 on the upper surface of the lower mold 1 are no longer pressed down by the sprocket holders 21, and each sprocket 16 rises due to the biasing force of the spring 17, and tension is applied to each roller chain 9. Granted.
After that, the blank shaped work cut out above
W' is carried out, and the press plate material W is carried between the vertically opposing cutting blades 7 and 6. From then on, the same operation as above is repeated, and the blank shaped workpiece W' is removed from the press plate material W. They are cut out sequentially.

Then, the blank-shaped workpiece to be cut out above
When changing the size, shape, etc. of W', the distance 1 between the pair of upper and lower cutting blades 7, 6 is adjusted by moving the guide posts 4, 4 in the longitudinal direction, and then The press plate material W is cut in the same manner.

In that case, each lower die cutting blade 6 moves on the bottom surface of the recess 1a of the lower die 1 together with the chain holding plates 11, 11 on its side by adjusting the interval between the pair of upper and lower die cutting blades 7, 6. Each roller chain 9, whose both ends are connected to the upper surface of the lower mold 1, does not move, but only changes the position where it is held by the sprockets 12, 12 of each of the chain holding plates 11, 11. The length of each roller chain 9 between the mold cutting blades 6, 6 increases or decreases depending on the interval l between the cutting blades 6, 6, and when the interval l between the cutting blades 6, 6 is long, it is long, and when the interval l is short. Sometimes it's shorter. Therefore, the number of ball casters 10, 10, .
For example, even when the lower die cutting blades 6, 6 (upper die cutting blades 7, 7) are adjusted in position in a V-shape when viewed from above, the ball caster 10 at a location where the distance l between the two cutting edges 6, 6 is narrow. The number of ball casters 10 is small, and the number of ball casters 10 is large at locations where the distance 1 is wide, so that the arrangement density of ball casters 10, 10, . . . between both cutting edges 6, 6 is always kept approximately constant. Therefore, after the cutting process, the blank workpiece W' has the ball casters 10, 1 distributed at a substantially constant density.
0, ..., and the workpiece W' will not get caught by the lower die 1 or the lower die cutting blade 6 due to its sagging, and thus the blank-shaped workpiece
W′ can be carried out reliably.

In addition, in the above embodiment, the ball casters 10, 1
Although two roller chains 9 having a diameter of 0, . The larger the number of chains, the more securely the blank workpiece W' can be supported.

(Effects of the invention) As described above, according to the invention, the pairs of cutting blades facing each other between the upper and lower dies are arranged with an interval in the conveying direction of the press plate material and the interval can be adjusted, and the cutting blades of the upper and lower dies are In a cutting device that uses a blade to cut press plates into blank-shaped workpieces, a ball caster that supports the press plates and the workpiece is mounted on the upper surface of the lower die, and a roller chain is stretched so as to slip under the lower die cutting blade in the plate conveyance direction. By attaching the ball casters to the bottom die, even if the spacing between the lower die cutting edges changes, the arrangement density of the ball casters between the cutting edges is always kept approximately constant, and the workpiece is supported evenly. This eliminates the possibility of blades getting caught and allows them to be carried out smoothly.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a schematic vertical sectional view of a cutting device, FIG. 2 is an enlarged perspective view of a roller chain, and FIG. 3 is an enlarged perspective view of a gear attached to the lower end of a guide post. be. 1...lower die, 2...upper die, 6...lower die cutting blade, 7
...Upper cutting blade, 9...Roller chain, 10...
Ball caster, 11... Chain holding plate, 12... Sprocket, 14... Damper, 1
5...Holding plate presser, 20...Tension applying means, W...Press plate material, W'...Blank shaped workpiece, l...Interval.

Claims (1)

[Scope of utility model registration request] Pairs of cutting blades facing each other between the upper and lower dies are arranged at intervals in the conveying direction of the press plate material, and the interval between the pairs of cutting blades is adjustable, so that the pressing operation of the upper and lower dies presses the press plate material. In a press plate cutting device that cuts into blank workpieces,
a roller chain extending in the front-rear direction on the upper surface of the lower die and extending below each of the lower die cutting blades, and having a large number of ball casters attached at approximately equal intervals;
A tension applying means that applies a substantially constant tension to the roller chain is slidably engaged with both sides in the front and back direction of each of the lower die cutting blades and movable back and forth with the lower die cutting blades, and meshes with the roller chain. a chain holding plate to which a sprocket is attached; holding plate biasing means for urging the chain holding plate upward so that the roller chain on its upper surface is positioned above the cutting edge surface of the lower mold; It is characterized by comprising a holding plate presser, which is provided opposite to the chain holding plate and lowers the chain holding plate against the urging force of the holding plate urging means before the cutting blade cuts the press plate material. A cutting device for press members.