JP2012101290A - Method and device for cutting synthetic resin plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut a synthetic resin plate into a round-chamfered state by preventing the generation of burrs at edges on both front and back surfaces of the synthetic resin plate being a workpiece by using a pair of cutting blades, and to cut the workpiece by perfectly separating a cut molding from the residual part of the workpiece.SOLUTION: In this method for cutting, by using a pair of cutting blades Ca, Cb of the same shape each formed by bending and shaping a strip-like steel blade into a cutting shape, a synthetic resin plate being a workpiece W into the shapes of the cutting blades Ca, Cb, the pair of cutting blades Ca, Cb are oppositely arranged by interposing the workpiece W, the pair of cutting blades Ca, Cb are entered in the workpiece W with a time difference or at the same time without bringing the respective tips thereof into contact with each other; thereafter any one-side cutting blade Ca (Cb) is made to penetrate the workpiece W while keeping the positional relationship between the pair of cutting blades Ca, Cb; and the workpiece W is cut into the shapes of the cutting blades Ca, Cb.

Description

  The present invention does not generate burrs on the front and back edges of a cut molded product obtained by cutting a synthetic resin plate using a pair of cutting blades of the same shape formed by bending a band-shaped steel blade into a cutting shape, and By cutting the synthetic resin plate that can completely separate the cut molded product from the rest of the workpiece (workpiece) and by pressing and sliding the slide plate of the press device once, the synthetic resin plate that is the workpiece is bent by the cutting blade. The present invention relates to a method of cutting into a shape and an apparatus therefor.

  A cutting blade obtained by bending a band-shaped steel blade into a cutting shape is also referred to as a “Thomson blade”, and is often used to cut a workpiece (synthetic resin plate as a material to be cut) into an arbitrary shape. When using this cutting blade to cut a workpiece into, for example, a square shape, a cutting blade formed by bending a steel blade into a square shape is pressed (sheared) perpendicularly against the synthetic resin plate. Yes. Thus, since the cutting blade is moved in one direction with respect to the workpiece and the workpiece is cut, the cutting edge of the processed product obtained by cutting the synthetic resin plate into a square shape is the side where the cutting blade enters. Although it becomes a rounded chamfered shape, burrs are inevitably generated on the side from which the cutting blade comes out. For example, when the processed product is a card such as a cash card, there is a problem that the fingertip may be damaged during the handling due to the presence of the burr.

  On the other hand, in Patent Document 1, a pair of cutting blades arranged vertically opposite to each other and both sides of each cutting blade are arranged on both sides of each cutting blade so that the cutting blade is retracted when not cutting. A method of cutting a workpiece using a pair of upper and lower cutting dies provided with an elastic body is disclosed.

  However, in the cutting method disclosed in Patent Document 1, a pair of upper and lower cutting blades enter the work at the same time, and in order to avoid contact of each cutting blade in order to cut the work, the thickness direction of the work An uncut portion always remains over the entire length of the central portion. Therefore, after the workpiece is cut by the pair of upper and lower cutting blades, in order to separate the cut molded product from the workpiece, there is a fatal defect that requires another process of completely cutting the uncut portion. Further, since the workpiece immediately before cutting moves downward while being sandwiched by the elastic body in the middle of compression deformation, the workpiece support state is unstable, so that the cutting accuracy is also poor.

Japanese Patent Laid-Open No. 2001-74540

The basic problem of the present invention is to use a pair of cutting blades to prevent the occurrence of burrs on both the front and back edges of a synthetic resin plate, which is a workpiece, and to cut into a rounded chamfered state. It is to make the cut molded product completely separated from the remainder and cut.
An application problem of the present invention is that when a work is cut by a pair of upper and lower cutting blades by a press-down slide of a slide plate of a press device to form a cut molded product, the work is performed by a single press-down slide of the slide plate. In addition to completely separating the cut molded product from the above, it is possible to eliminate the occurrence of burrs at the upper and lower edges of the cut molded product, thereby enabling cutting with high molding efficiency.

  The invention of claim 1 for solving the above-mentioned problem is to cut a synthetic resin plate as a workpiece into the shape of the cutting blade using a pair of cutting blades of the same shape formed by bending a band-shaped steel blade into a cutting shape. The pair of cutting blades are arranged opposite to each other with the workpiece sandwiched therebetween, and the pair of cutting blades have a time difference, or at the same time, the tips do not come into contact with the workpiece. Intruding, and then maintaining the positional relationship between the pair of cutting blades, penetrating either one of the cutting blades with respect to the workpiece, and cutting the workpiece into the shape of the cutting blade. .

  According to invention of Claim 1, since each cutting blade penetrate | invades from both front and back surfaces with respect to a workpiece | work and the said workpiece | work is cut | disconnected, each edge of the front and back of a cutting molded product is the shape where the rounded chamfering As a result, the generation of burrs is eliminated. As a result, the plate-like cut molded product cut by the method of claim 1 does not damage the fingertips or the like even when handled by hand. In addition, the pair of cutting blades that have entered without any contact between the tips of the workpieces can be obtained by cutting the workpiece in order to allow one of the cutting blades to penetrate the workpiece while maintaining the positional relationship. The resulting cut molded product is completely separated from the rest of the workpiece. Therefore, the separation process of the cut molded product with respect to the remaining part of the work after cutting becomes unnecessary.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the pair of upper and lower cutting blades cut the synthetic resin in a preheated state.

  According to the invention of claim 2, when the cutting blade enters the workpiece, the synthetic resin plate is softened locally and instantaneously, the cutting blade enters, and the synthetic resin When the cutting blade is escaped from the plate, the softened portion of the synthetic resin plate is cooled, so that the shape of the rounded chamfered edge is maintained as it is. Also, for resins with high hardness such as acrylic resins, there is a risk that cracks, cracks, etc. may occur if the cutting blade is cut in a state having the same temperature as normal temperature. With this preheating, the synthetic resin plate can be cut into the shape of a cutting blade with the edges being rounded, without causing cracks, cracks, or the like.

  The invention according to claim 3 is a synthetic resin plate which is a workpiece by a single pressing down slide of a slide plate of a press device using a pair of upper and lower cutting blades of the same shape formed by bending a band-shaped steel blade into a cutting shape. Is cut into the shape of the cutting blade, wherein the upper cutting blade is integrally attached below the slide plate, and the elastic member of the first elastic body is restored in a state where the maximum separation position with respect to the slide plate is regulated. The upper cutting die is configured so that the upper cutting blade is exposed by the retreating and raising of the upper work holding plate against the upper cutting blade against the force, and the upper cutting blade is integrally mounted above the movable base plate. In the state where the maximum separation position with respect to the movable base plate is regulated, the lower work presser plate that can be moved back with respect to the upper cutting blade against the elastic restoring force of the second elastic body moves downward. The cutting blade is exposed and the front The movable base plate uses a lower cutting die configured to be biased upward by the elastic restoring force of the third elastic body in a state where the maximum separation amount is regulated with respect to the lower die set plate, The elastic restoring force of each of the third elastic bodies is such that the second elastic body is the smallest and the third elastic body is the largest, and the slide is set while the work is set on the lower work holding plate. When the upper work retainer plate comes into contact with the lower work retainer plate due to the pressing down of the plate, the lower work retainer blade is moved backward by the lower work retainer blade due to the elastic deformation of the second elastic body. The upper cutting blade is exposed by intruding into the work by an amount determined by the first stopper and then retreating and raising the upper work holding plate with respect to the upper cutting blade due to elastic deformation of the second elastic body. 2 Sliding due to the restriction of the stopper The upper cutting blade enters the workpiece until the plate reaches the minimum separation position with respect to the movable base plate, and then the slide plate and the movable base plate are integrated to restore the elasticity of the third elastic body. By retreating and descending against the force, the upper and lower cutting blades are lowered by the lowering amount of the slide plate while maintaining the relative position in the vertical direction, and the upper cutting blade penetrates the workpiece, It is characterized by cutting the workpiece into the shapes of the upper and lower cutting blades.

  According to the invention of claim 3, the first elastic body for urging the upper cutting blade downward, the second elastic body for urging the lower cutting blade upward, and the third elasticity for urging the movable base plate upward. By setting the elastic restoring force of the body so that the second elastic body is the smallest and the third elastic body is the largest, the slide plate of the pressing device slides downward and slides downward. The workpieces sandwiched between the workpiece presser plates have a lower cutting blade projecting relative to the lower workpiece presser plate by lowering the lower workpiece presser plate against the elastic restoring force of the third elastic body. Enter the inside of the workpiece from below by the amount regulated by the stopper. Thereafter, as the upper work retainer plate rises against the elastic restoring force of the second elastic body, the lower cutting blade protrudes relative to the upper work retainer plate, and is the amount regulated by the second stopper, The workpiece penetrates into the workpiece from above, and thereafter, with the relative position of the upper and lower cutting blades maintained, the movable base plate is integrated with the slide plate to resist the elastic restoring force of the third elastic body. Then, the upper cutting blade penetrates the workpiece by descending. As a result, the workpiece is cut in accordance with the shapes of the upper and lower cutting blades, and a cut molded product completely separated from the workpiece is obtained. When the slide plate is lifted and slid after cutting, the upper and lower cutting blades and the movable base plate are moved to their original positions (positions before starting cutting) by the elastic restoring forces of the first to third elastic bodies. It is automatically restored.

  Thus, according to the third aspect of the present invention, although the pair of upper and lower cutting blades are used, each of the upper and lower cuttings from the work (object to be cut) is performed by a single pressing down slide of the slide plate. A cut molded product corresponding to the shape of the blade is cut in a state of being completely separated from the workpiece.

  According to a fourth aspect of the present invention, a single pressing of a slide plate of a press device is performed using a pair of upper and lower cutting dies provided with a pair of upper and lower cutting blades of the same shape formed by bending a band-shaped steel blade into a cutting shape. A device that cuts the synthetic resin plate, which is a workpiece, into the shape of the cutting blade by descending slide, and the slide plate is supported by a plurality of press guide rods erected on the press base so as to be slidable in the vertical direction. The upper die set plate is integrally attached to the lower surface of the slide plate, and the upper cutting die protrudes from the lower surface by a predetermined length to the upper cutting blade mounting plate disposed below the upper die set plate. And an upper cutting blade unit integrally attached to the upper die set plate with a predetermined upper intermediate plate arrangement space between the upper cutting blade and the upper die set plate. Directly below the blade unit An upper work presser plate is disposed, and a protruding portion of the upper cutting blade is inserted into an upper cutting blade insertion groove provided in the upper work presser plate, and is disposed in the upper intermediate plate disposition space, and is attached to the apparatus guide rod. An elastic restoring force of the first elastic body in a state where the upper work holding plate is integrally attached to the upper intermediate plate supported so as to be slidable in the vertical direction and the maximum separation position with respect to the upper die set plate is restricted. An upper work pressing unit that is urged downward by the lower cutting die, and the lower cutting die has a maximum amount of separation with respect to the lower die set plate directly above the lower die set plate, and has a third elasticity. The upper surface of the movable base plate slidably supported by the device guide rod and the lower cutting blade mounting plate disposed above the movable base plate while being urged upward by the elastic restoring force of the body. From A lower cutting blade unit integrally attached to the movable base plate having a lower intermediate plate arrangement space between the lower cutting blade and the movable base plate, the lower cutting blade unit being integrally attached to the movable base plate. A lower work retainer plate is disposed immediately above the cutting blade unit, and the protrusion of the lower cutting blade is inserted into a lower cutting blade insertion groove provided in the lower work retainer plate, and is disposed in the lower intermediate plate disposition space. The lower work pressing plate is integrally attached to the lower intermediate plate supported by the device guide rod so as to be slidable in the vertical direction, and the maximum separation position with respect to the movable base plate is regulated. A lower work presser unit provided with a first stopper that is arranged to be urged upward by the elastic restoring force of the two elastic bodies and is provided with a first stopper for restricting the lowering amount of the lower work presser plate relative to the movable base plate. Be A second stopper is provided that restricts the minimum distance of the upper die set plate from the base plate.

  The invention according to claim 4 is an apparatus for carrying out the method for cutting a synthetic resin plate according to claim 3, wherein the upper die is mounted on the lower surface of the slide plate via the upper die set plate, and the lower die set. The invention of claim 1 is reliably implemented by including a lower cutting die mounted on the plate via a movable base plate and a second stopper for regulating the minimum distance of the upper die set plate from the movable base plate. it can.

  The invention according to claim 5 is the invention according to claim 4, wherein each of the upper and lower cutting blade units includes a heater for heating the cutting blades integrally attached to the upper and lower cutting blade mounting plates. Yes.

  According to the invention of claim 5, since the heaters for heating the cutting blades are provided in the upper and lower cutting blade units, the synthetic resin plate can be cut by the preheated cutting blades.

  The invention of claim 6 is the invention of claim 4 or 5, wherein each of the first to third elastic bodies can be arranged at a plurality of locations, and the elastic restoring force can be adjusted by changing the number of arrangements. It is characterized by that.

  According to the invention of claim 6, since the elastic restoring force is adjusted by the number of the first to third elastic bodies arranged, the adjustment becomes easy.

  A seventh aspect of the invention is characterized in that, in any of the fourth to sixth aspects of the invention, the first to third elastic bodies are compression springs.

  According to the invention of claim 7, since a highly versatile compression spring is used as the elastic body, the implementation becomes easy.

  According to each of the first and second aspects of the present invention, the synthetic resin plate can be cut into a rounded chamfered state without generating burrs on both end edges of the front and back surfaces of the cut molded product. Since the cut molded product is completely separated from the remaining part of the workpiece (workpiece) and can be cut, it is not necessary to separate the cut molded product and the remaining workpiece in the subsequent process. In addition, by preheating the pair of cutting blades, when the cutting blade enters the synthetic resin plate, the synthetic resin plate is cut in a locally softened state, so that cracks, cracks, etc. occur. Thus, a cut molded product in which the edges of both surfaces are cleanly chamfered is obtained.

  According to invention of Claim 3, 4, the above-mentioned cutting molded product can be shape | molded with high efficiency using a press apparatus.

It is a perspective view of the cutting device of the synthetic resin board of the present invention. It is a front sectional view similarly. It is an enlarged view of the attachment part of the upper cutting blade Ca. FIG. 3 is a view taken along arrow X ₁ -X _{1 in} FIG. 2. FIG. 3 is a view taken along line X ₂ -X _{2 in} FIG. 2. FIG. ₃ is a view taken along line X ₃ -X _{3 in} FIG. 2. FIG. 3 is a view taken along arrow X ₄ -X _{4 in} FIG. 2. (1)-(3) is an operation explanatory view of the present invention. (3)-(5) is an operation explanatory view of the present invention.

First, with reference to FIG. 1 thru | or FIG. 6, the cutting device of the synthetic resin board concerning this invention is demonstrated. FIG. 1 is a perspective view of a cutting device for a synthetic resin plate according to the present invention, FIG. 2 is a front sectional view thereof, and FIGS. 3 to 6 are X ₁ -X ₁ lines to X _{4 in} FIG. it is over X ₄ taken along line diagram. An intermediate press base 82 is fixed to the upper surface of the press base 81, and a pair of press guide rods 83 are fixed vertically on both sides of the intermediate press base 82 in the press base 81, and the upper ends of the pair of press guide rods 83 are fixed. Is supported by a press upper plate (not shown). A slide plate 85 is supported on the pair of press guide rods 83 via a bush 84 so as to be slidable in the vertical direction. An upper die set plate 87 is integrally attached to the lower surface of the slide plate 85 through an intermediate fixing plate 86, and the upper surface of the intermediate press base 82 is opposed to the upper die set plate 87. A die set plate 88 is integrally attached. The slide plate 85 is slid downward in a pressed state by the hydraulic pressure D of a hydraulic cylinder K (see FIGS. 8A and 8B) supported on the upper surface of the press upper plate.

  The above press device is the same as a general press device, and the synthetic resin plate cutting device of the present invention is composed of upper and lower cutting dies A and B mounted on upper and lower die set plates 87 and 88, respectively. And this part has a feature. Since the lower cutting die B approximates a configuration in which the upper cutting die A is turned upside down, among members having equivalent functions, only members having main functions that are easier to understand for the sake of explanation, Subscripts (a) and (b) are attached to the same reference numerals to indicate the relevance of members on the reference numerals. Therefore, the same reference numerals are used as they are without attaching subscripts to general-purpose members, such as connecting bolts, for which there is little need to distinguish between the upper and lower cutting dies A and B.

In the upper cutting die A, an upper cutting blade Ca is integrally attached to an upper cutting blade mounting plate Pa disposed below the upper die set plate 87 so as to protrude from the lower surface by a predetermined length. An upper cutting blade unit CUa which has a predetermined upper intermediate plate arrangement space 8a between the plate 87 and is integrally attached to the upper die set plate 87, and an upper work presser plate directly below the upper cutting blade unit CUa 13a is disposed, the protruding portion of the upper cutting blade Ca is inserted into the cutting blade insertion groove 22 provided in the upper work presser plate 13a, and is disposed in the upper intermediate plate arrangement space 8a. In the state where the upper work holding plate 13a is integrally attached to the upper intermediate plate 14a supported so as to be slidable in the vertical direction, and the maximum separation position with respect to the upper die set plate 87 is restricted, the first compression spring And a work holding unit WUa on which are arranged is urged downward by _a resilient restoring force.

  The upper cutting blade mounting plate Pa is a member for mounting an upper cutting blade Ca obtained by bending a steel blade into a square shape, and as shown in FIGS. 1 to 5, the central portion has the shape of the upper cutting blade Ca. It consists of an outer plate portion 1 cut out in a certain square shape, and an inner plate portion 3 having a slightly similar shape with respect to the square hole 2 of the outer plate portion 1. The blade Ca is integrally attached (see FIGS. 3 and 5). The lower end portion of the upper cutting blade Ca protrudes from the lower surface of the upper cutting blade mounting plate Pa by a predetermined length. A heater plate 6 containing a plurality of heaters 5 for preheating the upper cutting blade Ca is laminated on the upper surface of the upper cutting blade mounting plate Pa, and a heat insulating plate 7 is laminated on the upper surface of the heater plate 6. The upper cutting blade mounting plate Pa, the heater plate 6 and the heat insulating plate 7 are integrated through a connecting bolt (not shown) to form an upper cutting blade unit CUa. With the upper intermediate plate arrangement space 8 a formed between the upper die set plate 87 and the upper die set plate 87, the upper die set plate 87 is integrally attached to the upper die set plate 87 via a plurality of connectors 11. Therefore, the upper cutting blade unit CUa slides integrally with the slide plate 85 in which the upper die set plate 87 is integrally attached to the lower surface.

The upper work presser unit WUa is arranged in the upper work presser plate 13a arranged with a predetermined gap 12 between the upper work blade attaching plate Pa and the lower surface of the upper cutting blade mounting plate Pa, and the upper intermediate plate arrangement space 8a. The upper intermediate plate 14 a is connected by a plurality of connecting bolts 15, and a plurality of upper regulating bolts 17 a whose heads are housed in the recesses 16 on the lower surface side of the upper intermediate plate 14 a are screwed into the upper die set plate 87. , is fitted to the regulatory bolt 17a, a plurality of first elastic restoring force of the compression spring S ₁ disposed between the upper die set plate 87 and the upper intermediate plate 14a, the upper work holding plate 13a is In this state, the maximum separation amount with respect to the upper die set plate 87 is regulated by the head of the upper regulating bolt 17a. The upper work pressing plate 13a has a two-part structure so as to be able to be formed through a rectangular cutting blade insertion groove 22 (see FIG. 3) for allowing the upper cutting blade Ca to be inserted. . Accordingly, as shown in FIGS. 1 and 2, the inner and outer portions of the cutting blade insertion groove 22 in the upper work pressing plate 13a are connected to the upper intermediate plate 14a via separate connecting bolts 15, respectively. ing. On the lower die set plate 88, four device guide rods 18 are fixed vertically to portions corresponding to the respective rectangular corner portions, and the tip portion of each device guide rod 18 is connected to the upper die set plate 87. It is supported by. As shown by a two-dot chain line in FIG. 4, the planar shape of the upper intermediate plate 14 a is a shape in which one opposing corner is largely omitted in order to avoid interference with a second stopper 37 described later. In addition, the opposing corner portions that are not missing are supported by the two device guide rods 18 that are arranged to face each other via the bush 21 and are slidable.

For this reason, as shown in FIG. 3 and FIG. 8A (2), (3), when not cutting, the protruding portion of the lower end portion of the upper cutting blade Ca does not protrude from the lower surface of the upper work pressing plate 13a. The upper work holding plate 13a enters the cutting blade insertion groove 22 of the upper work holding plate 13a, and the upper work holding plate 13a moves upward and backward with respect to the upper cutting blade unit CUa, as will be described later. The protrusion at the lower end (tip) protrudes downward from the lower surface of the upper work pressing plate 13a and enters (bites into) the work (object to be cut) W set on the upper surface of the lower work pressing plate 13b. ) Is configured. That is, when an upward force is applied to the upper work holding plate 13a, the upper work holding plate 13a is united with the upper intermediate plate 14a and is raised with respect to the upper cutting blade unit CUa, so that the gap 12 is decreased, together with the upper cutting blade Ca protrudes by a set length from the lower surface of the on the work holding plate 13a, a force to the upper is released, the first elastic restoring force of the compression spring S _1, Returning to the original position (maximum separation position regulated by the head of the upper regulating bolt 17a with respect to the upper die set plate 87), the protruding portion of the upper cutting blade Ca is the cutting blade insertion groove of the upper work holding plate 13a. It is configured to retract into 22. Further, as shown by a broken line in FIG. 4, there are a plurality of positions where the first compression spring S ₁ can be arranged at positions symmetrical with respect to the center line L passing through the axis of the press guide rod 83. By changing the number of the first compression springs S ₁ to be arranged, it is possible to change the sum of the elastic restoring forces of the plurality of first compression springs S ₁ . As described above, the number of the first compression springs S ₁ disposed (the number of uses) can be changed with respect to the total elastic restoring force of each of the second and third compression springs S ₂ and S ₃ described later, Used to determine the magnitude of magnitude. In addition, each elastic restoring force of each of the _{first to third} compression springs S _{1 to} S ₃ below accurately means the sum of elastic restoring forces of a plurality of compression springs.

  Next, the lower cutting die B will be described. As described above, the lower cutting die B approximates a configuration in which the upper cutting die A is turned upside down. Therefore, a member having a basic function has a suffix (b ), And for general-purpose members other than members having basic functions, the reference numerals used in the description of the upper cutting mold A are used as they are without attaching subscripts, and are different from the upper cutting mold A. Only the configuration part will be described.

Immediately above the lower die set plate 88, there is a small movable space 31 (see FIG. 2), and the movable base plate 32 is urged upward in a state where the maximum distance from the lower die set plate 88 is restricted. Has been installed. A plurality of concave portions 33 are provided on the upper surface of the movable base plate 32 so as to be symmetric with respect to the center line L, and the movable base is interposed via a movable base plate regulating bolt 34 in which a head is inserted into the concave portion 33. The plate 32 is connected to the lower die set plate 88 and is externally fitted to the movable base plate regulating bolt 34 so as to be disposed between the lower die set plate 88 and the movable base plate 32. The movable base plate 32 is biased upward with respect to the lower die set plate 88 by the elastic restoring force of S ₃ . Further, as shown in FIG. 7, the movable base plate 32 has a corner portion of one set out of two corner portions facing each other, and is opposed to the other set corner portion via a bush 30. The two apparatus guide rods 18 are slidably supported.

  The upper cutting blade unit CUa of the upper cutting die A is integrally attached to the lower surface of the upper die set plate 87, whereas the lower cutting blade unit CUb of the lower cutting die B is attached to the movable base plate 32. On the other hand, since it is integrally attached via a plurality of couplers 11 (see FIG. 2), it slides up and down integrally with the movable base plate 32.

On the other hand, the lower intermediate plate 14b is arranged in the lower intermediate plate arrangement space 8b between the movable base plate 32 and the heat insulating plate 7 of the lower cutting blade unit CUb, and the lower work holding unit WUb is arranged on the lower intermediate plate 14b. The presser plate 13b is integrally connected. The lower intermediate plate 14b is connected to the lower die set plate 88 via a plurality of lower restricting bolts 17b, and the head is hooked into the recess 16 formed in the lower intermediate plate 14b. The elastic restoring force of the second compression spring S ₂ that is externally fitted to the lower regulating bolt 17b and disposed between the lower intermediate plate 14b and the lower die set plate 88 in a state where the maximum separation amount with respect to 88 is regulated. Is biased upward. The lower intermediate plate 14b and the movable base plate 32 are arranged close to each other in the vertical direction, and both of them need to be slidably supported by the four device guide rods 18 via the bushes 21 and 30. Since the bush 21 and the same 30 interfere with each other, the lower intermediate plate 14b and the movable base plate 32, as shown in FIG. Thus, bushes 21 and 30 are provided at the corner portions of the remaining set and supported by the apparatus guide rod 18. As shown in FIG. 7, a plurality of second and third compression springs S ₂ and S ₃ are arranged so as to be symmetrical with respect to the center line L.

Here, the elastic restoring force (spring constant) of each of the first to third compression springs S _{1 to} S ₃ is the smallest for the second compression spring S ₂ by adjusting the number of compression springs to be used. Te are set such that the third compression spring S ₃ becomes maximum. Note that the elastic restoring force of the first compression spring S ₁ is precisely the invasion resistance when the upper cutting blade Ca enters the workpiece (object to be cut) into the elastic restoring force of the second compression spring S _2. It is necessary to be larger than the value obtained by adding.

Accordingly, as shown in FIGS. 8A and 8B, the workpiece W is set on the upper surface of the lower workpiece pressing plate 13b with the upper and lower workpiece pressing plates 13a and 13b being separated by a predetermined amount (a). When the slide plate 85 is pushed down and slid by the hydraulic cylinder K in the state [FIG. 8A (1)], the upper work retainer plate 13a is brought into contact with the upper surface of the work W set on the upper surface of the lower work retainer plate 13b. through the contact state [FIG. 8-1 a (2)], against the first to third small second elastic restoring force of the compression spring S ₂ of the most elastic restoring force of the compression spring S ₁ to S ₃ of the second compression spring S ₂ is compressed Te, as shown in [Figure 8-1 a (3)], the lower work holding unit WUb descends to the lower cutting blade units CUb at rest. That is, the lower work pressing plate 13b is lowered with respect to the stationary movable base plate 32. Thereby, the upper end part (tip part) of the lower cutting blade Cb that has been retracted from the upper surface of the lower work pressing plate 13b protrudes from the upper surface of the lower work pressing plate 13b and enters the work W.

  Here, in order to allow each of the upper and lower cutting blades Ca and Cb to enter the workpiece W so that the workpiece W can be cut, the amount of penetration of the lower cutting blade Cb into the workpiece W is larger than the thickness of the workpiece W. It is necessary to regulate so that it becomes smaller. Therefore, a plurality of rod-shaped (four in the embodiment) first stoppers 35 are vertically fixed to the lower die set plate 88, and the lower work presser plate 13b can contact the first stopper 35. The abutment rod 36 is integrally attached downward in the vertical direction. As shown in FIGS. 6 and 7, the four first stoppers 35 are arranged immediately below each corner portion of the rectangular lower work pressing plate 13b in order to improve the contact balance. ing. Accordingly, as shown in [FIG. 8A (2)], after the upper work holding plate 13a comes into contact with the upper surface of the work W, the lower work holding plate is lowered in the state where the slide plate 85 is lowered by (b). In a state where the contact rod 36 attached to 13b is in contact with the first stopper 35, the lower cutting blade Cb enters and stops halfway through the thickness (t) of the workpiece W.

  Here, when the upper and lower cutting blades Ca and Cb are not cut, both the lower surface of the upper work pressing plate 13a and the upper surface of the lower work pressing plate 13b are both retracted (x). Then, the amount of penetration of the lower cutting blade Cb into the workpiece W having a thickness (t) is [(b−x) <t]. Note that (b−x) is required to be smaller than the thickness (t) of the workpiece W, but is preferably slightly smaller than half of the thickness (t).

As shown in FIG. 8A (3), after the lower work pressing plate 13b (lower work pressing unit WUb) cannot be lowered with respect to the lower die set plate 88, the slide plate 85 continues. is pressed downward slide, the first elastic restoring force of the compression spring S ₁ is smaller than the third elastic restoring force of the compression spring S _3, by which the first compression spring S ₁ is being compressed, the workpiece W high The upper cutting blade unit CUa integrated with the slide plate 85 is lowered with respect to the upper work holding plate 13a that is stopped while keeping the position in the vertical direction constant, and the upper work holding plate The upper cutting blade Ca that has been retracted by (x) from the lower surface of 13a enters the workpiece W [FIG. 8-B (4)]. Here, it is necessary to avoid the upper cutting blade Ca from coming into contact with the lower cutting blade Cb that has stopped in the state of having entered the workpiece W first. Therefore, in the state where the upper cutting blade Ca has entered the workpiece W by the same amount [(b−x) <t / 2] as the lower cutting blade Cb, it is only necessary to stop the upper cutting blade Ca from entering. As a means for this, the second stopper 37 is fixed vertically on the upper surface of the movable base plate 32 and the abutting rod 38 vertically attached to the upper die set plate 87 downward is the second stopper. 37 is configured to abut on the surface 37. As shown in FIG. 6, two second stoppers 37 are provided on the center line L and provided between the lower work pressing plate 13 b and the press guide rod 83, so that the contact rod 38 The contact balance is improved.

  As a result, a predetermined gap (δ) is formed between the tips of the upper and lower cutting blades Ca and Cb that have entered the workpiece W, so that the tips of the upper and lower cutting blades Ca and Cb are in contact with each other. To avoid. Here, δ = [t−2 (b−x)]. In the experimental example, in the case of the thickness of the workpiece W (t = 0.9 mm), the intrusion amounts of the upper and lower cutting blades Ca and Cb into the workpiece W are both (0.4 mm). The gap (δ) at the tip of each of the upper and lower cutting blades Ca, Cb in W was (0.1 mm).

After the contact rod 38 attached to the upper die set plate 87 comes into contact with the second stopper 37 attached to the movable base plate 32, the slide plate 85 cannot be lowered with respect to the movable base plate 32. by pressing down the sliding of the slide plate 85 third compression spring S ₃ is compressed, and below each cutting blade Ca, while maintaining the vertical arrangement of Cb, in other words, above and below each cutting blade Ca, Cb Is slid downward (c) while maintaining the gap (δ) at each tip, and the upper cutting blade Ca penetrates the workpiece W, and the tip projects from the lower surface of the workpiece W. Is cut into a shape corresponding to the square shape of each of the upper and lower cutting blades Ca, Cb, and the cut molded product is obtained. That is, the cut molded product and the remaining part of the workpiece W are completely separated [FIG. 8-B (5)].

  In order for the tip of the upper cutting blade Ca to protrude from the lower surface of the workpiece W, the required lowering amount (c) of the slide plate 85 after the contact rod 38 contacts the second stopper 37 is [c> δ + (b −x) = t + x−b]. In the above experimental example, the required lowering amount (c) needs to be larger than (0.5 mm).

The cutting action of the workpiece W by the upper and lower cutting blades Ca and Cb described above is continuously performed by the press-down slide of the slide plate 85. When the slide plate 85 moves up after the workpiece W is cut, the upper and lower cutting blades Ca and Cb are sequentially slid relative to the workpiece W in the reverse order to the above and in the opposite direction. When the slide plate 85 is detached and returned to the original position, each of the first to third compression springs S _{1 to} S ₃ returns to the original compressed state by an elastic restoring force.

  In addition, the cutting action of the workpiece W by the upper and lower cutting blades Ca and Cb is performed by the upper and lower cutting blades Ca and Cb entering from both sides of the workpiece W, so that the edges of both sides of the cut molded product are rounded. As a result, burrs do not occur.

  Further, since the cutting blades Ca and Cb are preheated by the heater plate 6 incorporating a plurality of heaters 5, when the cutting blades Ca and Cb enter the synthetic resin plate as the workpiece W, In addition, when the synthetic resin plate is softened locally and instantaneously, when the cutting blades Ca and Cb enter and the cutting blades Ca and Cb escape from the synthetic resin plate, Since the softened portion of the resin plate is cooled, the shape of the edge chamfered without burrs is maintained as it is.

  Moreover, in the said Example, although the compression spring with high versatility is used as an elastic body, if it is a member which can be compressed and deformed, since the subject of this invention can be achieved, use of a rubber material etc. is also possible. .

  Moreover, in the said Example, although the workpiece W was cut | disconnected in square shape using the cutting blade Ca and Cb which bent and formed the steel blade in the square shape, the shape of a cutting blade is various. By changing, it is possible to obtain a cut molded product having the same shape as the cut product.

  In the above embodiment, a pair of upper and lower cutting dies A and B are mounted on the press device to cut the workpiece W. However, a plurality of pairs of cutting dies A and B are mounted on the same press device. Thus, a plurality of products to be cut can be obtained at the same time.

  Moreover, in the said Example, the workpiece | work W is cut | disconnected in the state which made the heater plate 6 which incorporated the some heater 5 contact each upper and lower cutting blade Ca and Cb, and pre-heated each said cutting blade Ca and Cb. However, the heater plate 6 is provided when the cutting blades Ca and Cb can be cut without being cracked without preheating due to the hardness of the synthetic resin plate constituting the workpiece W. There is no need.

  Furthermore, in the above embodiment, the upper and lower cutting dies A and B are attached to the upper and lower die set plates 87 and 88 of the press device, respectively, and the press-type slide plate is moved once by pressing and sliding. The cut molded product is completely separated from the workpiece member by a pair of cutting blades Ca and Cb arranged above and below the workpiece and cut, and since the cutting efficiency is high, there is an advantage suitable for mass production. is there.

  However, the invention of claim 1 is “a method of cutting a synthetic resin plate as a workpiece into the shape of the cutting blade using a pair of cutting blades of the same shape formed by bending a band-shaped steel blade into a cutting shape. The pair of cutting blades are arranged opposite to each other with the workpiece interposed therebetween, and the pair of workpieces are allowed to enter the workpiece without a time difference or at the same time without contacting each tip. , While maintaining the positional relationship between the pair of workpieces, one of the cutting blades is penetrated through the workpiece and the workpiece is cut into the shape of the cutting blade. If the workpiece is cut by causing the pair of cutting blades arranged as described above to act as described above, the present invention can be carried out without using the press device.

  For example, a first drive mechanism for moving one of a pair of cutting blades arranged with the workpiece sandwiched therebetween and a second drive mechanism for driving the other is provided, and each of the first and second drives After the mechanisms are driven simultaneously or with a time difference and the tips of the pair of cutting blades are allowed to enter without contacting the workpiece, one of the first and second drive mechanisms is disabled, It can also be realized by further sliding the other side in the immediately preceding sliding direction and penetrating the workpiece.

A: Upper cut type
B: Bottom cutting type
Ca: Upper cutting blade
Cb: Lower cutting blade
CUa: Upper cutting blade unit
CUb: Lower cutting blade unit
S ₁ : First compression spring (first elastic body)
S ₂ : Second compression spring (second elastic body)
S ₃ : third compression spring (third elastic body)
W: Workpiece (object to be cut)
WUa: Upper work clamp unit
WUb: Lower work clamp unit
5: Heater
6: Heater plate
8a: Upper intermediate plate arrangement space
8b: Lower intermediate plate arrangement space
13a: Upper work clamp
13b: Lower work clamp
14a: Upper intermediate plate
14b: Lower intermediate plate
17a: Upper regulating bolt
17b: Lower regulation bolt
18: Device guide rod
32: Movable base plate
34: Movable base plate regulating bolt
35: First stopper
37: Second stopper
83: Press guide rod
85: Slide plate
87: Upper die set plate
88: Lower die set plate

Claims (7)

A method of cutting a synthetic resin plate as a workpiece into the shape of the cutting blade using a pair of cutting blades of the same shape formed by bending a band-shaped steel blade into a cutting shape,
The pair of cutting blades are arranged opposite to each other with the workpiece interposed therebetween,
The pair of cutting blades are inserted into the workpiece without contact with each other with a time difference or at the same time, and then either one of the cutting blades is maintained while maintaining the positional relationship between the pair of cutting blades. A method for cutting a synthetic resin plate, wherein a blade is passed through a workpiece and the workpiece is cut into the shape of the cutting blade.   The synthetic resin plate cutting method according to claim 1, wherein the pair of upper and lower cutting blades cut the synthetic resin in a preheated state. Using a pair of upper and lower cutting blades of the same shape formed by bending a band-shaped steel blade into a cutting shape, the synthetic resin plate that is a workpiece is shaped into the shape of the cutting blade by a single pressing down slide of the slide plate of the press device. A method of cutting,
The upper cutting blade is integrally attached to the lower side of the slide plate, and the upper work piece is opposed to the upper cutting blade against the elastic restoring force of the first elastic body in a state where the maximum separation position with respect to the slide plate is regulated. An upper cutting die having a structure in which the upper cutting blade is exposed by the retreat rise of the presser plate;
An upper cutting blade is integrally attached above the movable base plate, and retracts with respect to the upper cutting blade against the elastic restoring force of the second elastic body in a state where the maximum separation position with respect to the movable base plate is regulated. The lower workpiece pressing plate is retracted and lowered, so that the lower cutting blade is exposed, and the movable base plate is elastically restored from the third elastic body in a state where the maximum distance from the lower die set plate is restricted. Use a lower cutting mold with a configuration biased upward by force,
The elastic restoring force of each of the first to third elastic bodies is such that the second elastic body is the smallest and the third elastic body is the largest,
When the work is set on the lower work pressing plate, the slide plate is pressed and lowered, so that the upper work pressing plate comes into contact with the lower work pressing plate and then the elastic deformation of the second elastic body. By lowering and lowering the lower work holding plate with respect to the lower cutting blade, the lower cutting blade is exposed and enters the work by an amount determined by the first stopper, and thereafter, the upper cutting blade is elastically deformed by the second elastic body. The upper cutting blade enters the workpiece until the upper cutting blade is exposed as a result of the upward movement of the upper work retainer plate, and the slide plate reaches the minimum separation position relative to the movable base plate due to the restriction of the second stopper. In addition, the slide plate and the movable base plate are integrated and moved backward and downward against the elastic restoring force of the third elastic body, so that the upper and lower cutting blades maintain the relative position in the vertical direction. The only lowering amount of the slide plate descends, by the upper cutting blade penetrates the workpiece, the cutting method of the synthetic resin plate, which comprises cutting the workpiece upper and lower shapes of the cutting blades. Synthetic resin that is a workpiece by a single press-down slide of a slide plate of a press device using a pair of upper and lower cutting dies provided with a pair of upper and lower cutting blades of the same shape formed by bending a band-shaped steel blade into a cutting shape An apparatus for cutting a plate into the shape of the cutting blade,
The slide plate is supported by a plurality of press guide rods erected on the press base so as to be slidable in the vertical direction, and the upper die set plate is integrally attached to the lower surface of the slide plate,
The upper cutting mold is
An upper cutting blade is integrally attached to an upper cutting blade mounting plate disposed below the upper die set plate in a state of projecting a predetermined length from the lower surface thereof, and a predetermined upper middle between the upper die set plate and the upper die set plate. An upper cutting blade unit integrally attached to the upper die set plate having a plate arrangement space;
An upper work presser plate is disposed directly below the upper cutting blade unit, and a protruding portion of the upper cutting blade is inserted into an upper cutting blade insertion groove provided in the upper work presser plate, and the upper intermediate plate placement space In the state where the upper work holding plate is integrally attached to the upper intermediate plate that is arranged and supported so as to be slidable in the vertical direction on the apparatus guide rod, and the maximum separation position with respect to the upper die set plate is regulated, An upper work presser unit arranged to be biased downward by the elastic restoring force of the first elastic body,
The lower cutting mold is
Immediately above the lower die set plate, the maximum distance with respect to the lower die set plate is regulated, and the upper guide member is slidably supported by the device guide rod while being urged upward by the elastic restoring force of the third elastic body. A movable base plate,
A lower cutting blade is integrally attached to the lower cutting blade mounting plate disposed above the movable base plate in a state protruding from the upper surface by a predetermined length, and a lower intermediate plate arrangement space is formed between the movable base plate and the lower cutting blade. A lower cutting blade unit integrally attached to the movable base plate,
A lower work pressing plate is disposed immediately above the lower cutting blade unit, and a protruding portion of the lower cutting blade is inserted into a lower cutting blade insertion groove provided in the lower work pressing plate, so that the lower intermediate plate arrangement space is inserted. The lower work holding plate is integrally attached to the lower intermediate plate that is arranged and supported by the device guide rod so as to be slidable in the vertical direction, and the maximum separation position with respect to the movable base plate is regulated. A lower work presser unit provided with a first stopper that is arranged to be urged upward by the elastic restoring force of the second elastic body and that regulates the lowering amount of the lower work presser plate relative to the movable base plate. ,
A synthetic resin plate cutting apparatus, wherein a second stopper is provided for restricting a minimum distance of the upper die set plate from the movable base plate.   The synthetic resin plate cutting apparatus according to claim 4, wherein each of the upper and lower cutting blade units includes a heater for heating the cutting blades integrally attached to the upper and lower cutting blade mounting plates.   The composition according to claim 4 or 5, wherein each of the first to third elastic bodies can be arranged at a plurality of locations, and the elastic restoring force can be adjusted by changing the number of arrangements. Resin plate cutting device.   7. The synthetic resin plate cutting device according to claim 4, wherein each of the first to third elastic bodies is a compression spring.

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