JP2021137852A - Die - Google Patents

Abstract

To provide a die in which a proper blanking clearance is secured between an upper blade and a lower blade at low costs.SOLUTION: A first die 1 has a punch 100, formed with an upper blade 111, in an upper die 10 and has a die 150, formed with a lower blade 161, in a lower die 30. The punch 100 includes guided part 120 formed integrally with the upper blade 111. The die 150 includes guide parts 170, 270, 370, 470 formed integrally with the lower blade 161. The guide part 170 slidably contacts with the guided part 120 in prior to cutting of a workpiece 10 to restrict movement of the guided part 120 in all directions intersecting with a press direction. A slide contact clearance C2 is formed smaller than a blanking clearance C1.SELECTED DRAWING: Figure 3

Description

The present invention relates to a mold. More specifically, the present invention relates to a mold having an upper mold having a punch on which an upper blade is formed and a lower mold having a die on which a lower blade is formed to engage with the upper blade to cut a work material. ..

Conventionally, there is a mold for cutting a work material by an upper blade formed on an upper die punch and a lower blade formed on a lower die. As the schematic structure of such a mold, for example, the following Patent Document 1 is generally used. That is, the general mold structure is such that the guide post fixed to the upper mold is guided by the guide bush fixed to the lower mold, as in the mold disclosed in Patent Document 1.

Japanese Unexamined Patent Publication No. 2008-62283

However, in a general die structure such as the above prior art, the accuracy of the positional relationship between the punch and the die depends on the guide posts and guide bushes separately provided on the upper and lower dies, respectively. doing. In other words, the positional accuracy between the upper blade of the punch and the lower blade of the die is the machining accuracy and assembly accuracy of each member of the upper mold from the upper blade to the guide post, and each member of the lower mold from the guide bush to the lower blade. It is affected by the guide accuracy between the guide post and the guide bush. For this reason, it is difficult to align the upper blade and the lower blade with high accuracy when assembling the mold for the first time or when replacing a punch with a worn upper blade or a die with a worn lower blade. .. On the other hand, processing all parts with high precision increases the cost of the mold. That is, the higher the accuracy is required, the higher the machining cost of the part tends to be. For example, in the region where the punching clearance between the upper blade and the lower blade competes with the sliding contact clearance of the guide, the machining cost of the part May become very high. That is, it has been difficult to secure an appropriate punching clearance between the upper blade and the lower blade with high accuracy and at low cost.

The present invention has been made for the purpose of solving the problems of the above-mentioned conventional techniques. That is, the problem is to provide a mold in which an appropriate punching clearance between the upper blade and the lower blade is secured at low cost.

The mold of the present invention made for the purpose of solving this problem has an upper mold having a punch on which an upper blade is formed and a die on which a lower blade is formed which meshes with the upper blade to cut a work material. A mold provided with a lower die, wherein the punch is provided with a punch-side guide component formed in connection with or integrally with the upper blade, and the die is formed in connection with or integrally with the lower blade. It is provided with a die-side guide component that slides in contact with the punch-side guide component prior to cutting the work material and regulates the movement of the punch-side guide component in all directions orthogonal to the press direction. The die is characterized in that the sliding contact clearance of the die-side guide component with respect to the punch-side guide component is smaller than the drawing clearance of the lower blade with respect to the upper blade.

In the mold according to the present invention, the punch side guide component is connected or integrally formed with the upper blade, and the die side guide component is connected or integrally formed with the lower blade. Then, the guide configuration in which the punch-side guide component and the die-side guide component are in sliding contact with each other can directly regulate the movement of the punch on which the upper blade is formed in all directions orthogonal to the press direction. Therefore, even if there is an assembly error between the punch and the upper die, the die and the lower die, etc., an appropriate punching clearance between the upper blade and the lower blade can be secured at low cost.

Further, in the above-described mold, it is preferable that the punch-side guide component portion is provided with at least three or more guide component surfaces formed so as to face different directions in a direction orthogonal to the press direction. This is because the punch-side guide component can be regulated in all directions of 360 degrees on the surface orthogonal to the press direction with a simple structure. Therefore, for example, even when cutting a complicated shape, a punching clearance can be appropriately secured.

Further, in the mold described above, the punch is formed so as to be able to induce bending of the punch in a direction orthogonal to the pressing direction between the upper blade and the fixing portion fixed to the upper mold. It is preferable to have a bending-inducing portion. This is because the displacement between the upper blade and the lower blade is absorbed by the bending-inducing portion, so that the displacement can be easily corrected without affecting the upper blade and the like.

Further, in the mold described above, it is preferable that the bending-inducing portion is provided by a through hole formed in the direction perpendicular to the side wall of the punch. This is because the moment of inertia of area and the buckling stress of the punch can be easily adjusted by the size of the through hole. Further, the amount of bending of the punch due to the shearing force of the work material can be adjusted by the position, size, penetration direction, and the like of the through hole.

Further, in the mold described above, it is preferable that the coefficient of thermal expansion of the punch and the coefficient of thermal expansion of the retainer that fixes the punch to the upper mold are the same or similar. This is because even if the temperature of the punch and the retainer rises due to the frictional heat during press working, it is possible to prevent the formation of a gap between them because their thermal expansion coefficients are the same or similar. Therefore, even in continuous press working, the position of the punch is less likely to shift, and an appropriate punching clearance can be maintained.

Further, in the die described above, it is preferable that the die is a progressive die in which a work material formed in a predetermined width is pressed while being conveyed at a predetermined pitch. The progressive type is provided with a plurality of processing stages, and an assembly error between the punch and the die may occur for each stage. This is because, in response to such a problem, the punch having the upper blade can be directly guided to the die having the lower blade in each of the stages, so that an appropriate punching clearance can be secured.

Further, in the above-mentioned mold, the first upper blade formed so that a front hole having a predetermined shape can be punched in the work material at the front stage on the upstream side in the feed direction of the work material, and the above-mentioned mold. The rear stage located on the downstream side of the front stage is provided with a second upper blade formed so that a part of the front hole formed in the front stage can be punched, and the front stage has a regular punched shape. Forming a front hole having a rough punched shape, the second upper blade re-pulls the rough punched shape of the front hole into a regular punched shape, and the second punch on which the second upper blade is formed. The second punch-side guide component formed in connection with or integrally with the second die at the position of the regular punched shape of the front hole has a second lower blade in which the second upper blade meshes. It is preferable that the guide component is formed so as to be slidable with the second die-side guide component formed so as to be connected or integrally formed. This is because an appropriate punching clearance can be ensured even in re-pulling where lateral force is likely to be generated.

Further, in the mold described above, the upper blade is formed so as to be able to mesh with the lower blade inside the outer edge of the work material, and the punch side guide component portion is outside the outer edge of the work material. It is preferable that the die-side guide component is formed so as to be slidable. This is because the guide by the die-side guide component and the punch-side guide component can be performed without being disturbed by the work material. That is, it is possible to secure an appropriate punching clearance without being disturbed by the work material.

Further, in the above-mentioned mold, it is preferable to cut a thin steel plate having a plate thickness of 0.2 mm or less as a work material. This is because the punching clearance can be secured with high accuracy, so that it can be preferably used for press working of a work material that is too small to stably secure a proper punching clearance with a conventional general guide configuration.

According to the present invention, there is provided a mold in which an appropriate punching clearance between the upper blade and the lower blade is secured at low cost.

It is sectional drawing of the 1st mold of 1st Embodiment. FIG. 5 is an enlarged cross-sectional view of the punch and die of the first embodiment. It is a top view of the punch and die of 1st Embodiment. It is a perspective view of the punch of the modification of 1st Embodiment. It is an exploded perspective view of the punch and die which concerns on the 2nd die of 2nd Embodiment. It is sectional drawing of the punch and die which concerns on 2nd Embodiment. It is a top view of the punch and die which concerns on the 3rd die of 3rd Embodiment. It is a figure which shows the front hole formed in the 1st stage which concerns on 3rd Embodiment. It is sectional drawing of the punch and die in the 1st stage which concerns on 3rd Embodiment. It is sectional drawing of the punch and die in the 2nd stage which concerns on 3rd Embodiment. It is a figure for demonstrating the 1st modification of a punch and the like. It is a figure for demonstrating the 2nd modification of a punch and the like. It is a figure for demonstrating the 3rd modification example of a punch and the like.

Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. First, the first embodiment, which is one of the present embodiments, will be described, and then the second embodiment, the third embodiment, and the modified examples will be described in order.

[First Embodiment]
The mold according to this embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic cross-sectional view of the first mold 1 which is a mold according to the present embodiment. The first die 1 of this embodiment is a press die that punches a work material by a press operation. FIG. 2 is an enlarged cross-sectional view showing the punch 100 and the die 150 of the first mold 1. 1 and 2 are cross-sectional views at the bottom dead center of the slide movement of the first mold 1. FIG. 3 is a plan view of the first mold 1 in a cross section taken along the line AA in FIG. Each figure shows an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other. The Z-axis direction is the press direction, and the Y-axis direction is the width direction of the work piece. Further, the X-axis direction is the longitudinal direction of the material to be processed and is the feed direction (transport direction). The first mold 1 of this embodiment has a vertical direction as a pressing direction.

As shown in FIG. 1, the first die 1 of the present embodiment has an upper die 20 that slides in the Z-axis direction during press working, and a lower die 30 that is fixedly provided below the upper die 20 and is pressed. The sheet-shaped work piece 10 is cut by processing. The work material 10 in this embodiment is, for example, a steel plate having a plate thickness of 0.2 mm. The upper die 20 includes a punch holder 21 attached to the shank, a punch 100 provided below the punch holder 21, a guide post 40, and a pad 60. The lower mold 30 includes a die holder 31, a die 150 provided on the die holder 31, a guide bush 50, and a transport guide 70.

The punch 100 has an upper blade 111 formed at a tip portion 101 located below. Further, the punch 100 is fixed to the punch holder 21 by the punch retainer 140 at the fixing portion 130 on the side opposite to the upper blade 111. The fixing portion 130 of the punch 100 is inserted into the punch holding hole 141 of the punch retainer 140, and the side surface 131 thereof is in contact with the punch holding hole 141, so that the position in the horizontal direction is held. Further, the fixing portion 130 of the punch 100 has a flange 132 protruding in the horizontal direction. The flange 132 is fixed to the punch holder 21 by being sandwiched between the bottom surface 143 of the recess 142 formed on the upper side of the punch retainer 140 and the punch holder 21. As a result, the punch 100 is fixed to the upper mold 20. Further, in this embodiment, the same material as the punch 100 is used as the material of the punch retainer 140. Specifically, for example, cemented carbide can be used as the material for the punch 100 and the punch retainer 140.

The guide post 40 has a guided portion 41 on the lower side, and is fixed to the punch holder 21 by a guide retainer 45 at a fixing portion 42 on the opposite side of the guided portion 41. The guided portion 41 of the guide post 40 is inserted into the guide bush 50 provided in the lower mold 30. The position accuracy of the guide post 40 with respect to the punch 100 is determined to some extent by a positioning pin or the like.

The pad 60 is provided on the punch holder 21 in a state where the urging force toward the lower mold 30 is received by the urging member. The pad 60 takes a position away from the work piece 10 when the upper die 20 is at the top dead center of its slide movement, and when the upper die 20 slides from the top dead center to the bottom dead center, the work material 10 can be pressed from above. As a result, the material 10 to be processed can be fixed during press working. Further, when the upper die 20 slides from the bottom dead center to the top dead center, the pad 60 pushes the work piece 10 toward the lower die 30 so that the work piece 10 becomes a punch 100. It is possible to prevent the lumber from sticking and moving.

The die 150 is fixed in a state of being accommodated in a die accommodating hole 32 which is a recess formed in the die holder 31. The die 150 is formed with an entry hole 151 into which the tip portion 101 of the punch 100 enters. The entry hole 151 is a through hole that penetrates the die 150, and a lower blade 161 that meshes with the upper blade 111 of the punch 100 is formed in the opening 152 on the upper side thereof. The die holder 31 is provided with a through hole 33 at a position corresponding to the lower side of the entry hole 151 of the die 150, through which a portion separated from the work piece 10 by cutting is discharged. In this embodiment, the same material as the punch 100 is used as the material of the die 150.

The guide bush 50 is fixed in a state of being housed in a bush fixing hole 35 which is a recess formed in the die holder 31. The guided portion 41 of the guide post 40 is inserted inside the guide bush 50. As a result, the guide bush 50 can guide the guide post 40. The position accuracy of the guide bush 50 with respect to the die 150 is also determined to some extent. Further, in the present embodiment, two pairs of the guide post 40 and the guide bush 50 are provided with the punch 100 and the die 150 interposed therebetween. Since the guide post 40 is guided by the guide bush 50, the upper die 20 can slide and move while maintaining the position accuracy with respect to the lower die 30 to some extent.

The transport guide 70 is a member that guides the work material 10 in the width direction (Y-axis direction). The transport guide 70 of this embodiment is fixed to the die holder 31. Although FIG. 1 shows a transport guide 70 that guides only one of the lumber 10s in the width direction, a guide 70 that guides the other lumber 10 in the width direction is also provided. .. The transport guide 70 prevents the lumber 10 being transported from meandering in the width direction.

As shown in the enlarged view of FIG. 2, the punch 100 has an upper blade portion 110 having an upper blade 111 formed on a lower edge at a tip portion 101, and a guided portion 120. In the punch 100 of this embodiment, both the upper blade 111 and the guided portion 120 are integrally formed on the same member. Further, the die 150 has a lower blade portion 160 in which a lower blade 161 is formed on an upper edge and a guide surface 171 as an inner wall surface of the entry hole 151. In the die 150 of this embodiment, both the lower blade 161 and the guide surface 171 are integrally formed on the same member. That is, a part of the opening of the entry hole 151 is the lower blade 161 and the part other than the lower blade 161 is the upper end of the guide surface 171.

FIG. 2 shows a punching clearance C1 at which cutting is performed and a sliding contact clearance C2 that guides the punch 100 with respect to the die 150. The punching clearance C1 is a gap between the upper blade 111 and the lower blade 161 that pass each other during the cutting process of the material 10 to be processed. Further, the sliding contact clearance C2 is formed by a guided surface 121 which is a side surface of the guided portion 120 and a guide surface 171 which is an inner wall surface facing the guided surface 121 of the guided portion 120 which has entered the approach hole 151. There is a gap. Further, in the punch 100, the guided portion 120 has a portion protruding below the upper blade 111, that is, toward the die 150. FIG. 2 shows the entry depth K1 of the upper blade 111 into the entry hole 151 of the die 150 and the entry depth K2 of the guided portion 120 into the entry hole 151 at the bottom dead center of the punch 100. There is.

FIG. 3 shows a plan view of the punch 100 and the die 150 with a cross section at the AA position shown in FIG. In FIG. 3, the cross section of the punch 100 is shown by hatching, the entry hole 151 formed in the die 150 is shown by a solid line, and the material 10 to be processed is shown by a two-dot chain line.

As shown in FIG. 3, the punch 100 of this embodiment has a convex shape such that the upper blade portion 110 bites into one end of the work piece 10 in the width direction, and the upper blade 111 has an upper blade portion. It is formed on the outer edge of 110. Further, the lower blade 161 of the die 150 is formed so as to surround the upper blade 111 while providing the upper blade 111 and the punching clearance C1. At a position downstream of the punch 100 of the lumber 10 in the transport direction, a punched portion 11 is formed in which a part of the end portion in the width direction is removed by cutting by the upper blade 111 and the lower blade 161. ing.

Further, as shown in FIG. 3, the punch 100 of the present embodiment has a guided portion 120 outside the upper blade portion 110 in the width direction of the lumber 10 to be processed. As a result, the guided portion 120 is located outside the outer edge of the material 10 to be processed in the width direction. The guided portion 120 is provided with five guided surfaces 121 (guide constituent surfaces). Of the five guided surfaces 121, the two guided surfaces 121 on the right side provided with the upper blade portion 110 sandwiched in the X-axis direction are processed in the same surface. That is, the punch 100 of the present embodiment includes four guided surfaces 121 formed so as to face different directions in the horizontal direction. Two of them are provided so as to face each other in the X-axis direction, and the other two are provided so as to face each other in the Y-axis direction. The angle between the adjacent guided surfaces 121 is a right angle.

Further, as shown in FIG. 3, the die 150 is provided with a guide surface 171 so as to surround the guided surface 121 of the punch 100. That is, the die 150 is provided with a guide surface 171 so as to face all the guided surfaces 121 of the punch 100. The guide surface 171 on the die 150 constitutes a guide portion 170 that guides the guided portion 120. Thereby, the guide portion 170 of the die 150 of the present embodiment can restrict the movement of the guided portion 120 of the punch 100 in all the horizontal directions orthogonal to the Z-axis direction which is the press direction.

Here, as described above in FIG. 2, the guided portion 120 projects downward from the upper blade 111 in the press direction. That is, the approach depth K2 of the guided portion 120 at the bottom dead center is longer than the approach depth K1 of the upper blade 111. Further, the approach depth K2 of the guided portion 120 is longer than the combined length of the approach depth K1 of the upper blade 111 and the thickness t of the material 10 to be processed. Therefore, when the press operation in which the upper die 20 slides from the top dead center to the bottom dead center is performed, the guided portion 120 is inserted into the guided hole before the upper blade 111 comes into contact with the workpiece 10. It can be entered into 151. That is, the guided surface 121 of the guided portion 120 can be brought into sliding contact with the guide surface 171 of the guide portion 170 prior to the cutting process of the material 10 to be processed. As a result, the cutting process of the lumber 10 to be processed can be started while the guided portion 120 is already guided by the guide portion 170. Further, the sliding contact clearance C2 is formed to be smaller than the punching clearance C1.

With such a configuration, the horizontal movement of the guided portion 120 integrally formed with the upper blade 111 can be directly regulated by the guide portion 170 formed integrally with the lower blade 161. .. Therefore, an appropriate punching clearance C1 between the upper blade 111 and the lower blade 161 can be reliably maintained. For example, when there is an assembly accuracy error between the punch 100 in the upper die 20 and the die 150 in the lower die 30, the upper blade 111 of the punch 100 and the lower blade of the die 150 in the first mold 1 in the assembled state The position may be misaligned with 161. However, even if the upper blade 111 and the lower blade 161 are misaligned in the assembled state, the guided portion 120 is pulled out and the sliding contact clearance is more accurate than the punching clearance C1 before the cutting process is started by the pressing operation. At C2, it can be guided by the guide unit 170. That is, the punch 100 can be guided with high accuracy, and the cutting process can be performed in a state where an appropriate punching clearance C1 is secured. That is, for example, the punching clearance C1 can be maintained even if the positioning accuracy and the guide accuracy of the guide post 40 and the guide bush 50 cannot maintain the punching clearance C1. Further, in the present embodiment, the punch 100 having the upper blade 111 and the guided portion 120 and the die 150 having the lower blade 161 and the guide portion 170 are machined with high accuracy to secure an appropriate punching clearance C1. Can be done. That is, by reducing the number of parts that require processing with high accuracy, it is possible to secure an appropriate punching clearance C1 at low cost.

Further, the guided portion 120 of the punch 100 is provided with four guided surfaces 121 facing in different directions in the horizontal direction orthogonal to the pressing direction. In this way, by providing three or more guided surfaces 121 formed so as to face different directions in the horizontal direction, the regulation of the guided portion 120 in all directions of 360 degrees in the horizontal cross section can be simplified. It can be done cheaply.

Further, in this embodiment, the material of the punch 100 and the material of the punch retainer 140 are the same. As a result, the punch 100 and the punch retainer 140 have the same coefficient of thermal expansion. The temperature of the punch 100 tends to rise as the work piece 10 is continuously cut. For this reason, the punch 100 undergoes thermal expansion as the temperature rises as the work piece 10 is continuously cut. The same applies to the punch retainer 140, which is a member for fixing the punch 100, with respect to the thermal expansion caused by the cutting process of the material 10 to be processed. Then, for example, if the coefficient of thermal expansion of the punch retainer 140 is too large with respect to the coefficient of thermal expansion of the punch 100, a large gap may be formed between the punch 100 and the punch retainer 140 as the temperature rises. There is. In such a case, the punch 100 may not be properly fixed to the upper die 20, and rattling or inclination may occur, so that an appropriate punching clearance C1 may not be secured. On the other hand, in the present embodiment, such a problem can be suppressed by having the same coefficient of thermal expansion of the punch 100 and the punch retainer 140. That is, an appropriate punching clearance C1 can be maintained even when the cutting process is continuously performed.

Further, the guided portion 120 of the punch 100 is in sliding contact with the guide portion 170 of the die 150 in the Y-axis direction outside the outer edge in the width direction of the material 10 to be processed. Therefore, the guide of the guided portion 120 by the guide portion 170 is prevented from being disturbed by the material 10 to be processed. Further, the work material 10 of the present embodiment has a thickness t of 0.2 mm or less. As described above, in the case of a thin steel plate having a plate thickness of 0.2 mm or less, the appropriate punching clearance C1 is generally about 10% of the plate thickness, so that it is 0.02 mm or less. A general guide structure such that the upper mold 20 is composed of a guide post 40 provided separately from the punch 100 and the lower mold 30 is provided with a guide bush 50 separately from the die 150 is a guide target. A plurality of members are interposed between the guide configuration and the guide configuration. That is, the general guide structure indirectly guides the punch 100 with respect to the die 150. With such an indirect guide structure, it is difficult to appropriately secure a small punching clearance C1 of 0.02 mm or less. On the other hand, in the present embodiment, the punch 100 on which the upper blade 111 is formed can be directly guided by the die 150 on which the lower blade 161 is formed. Therefore, even when the appropriate punching clearance C1 is small, the punching clearance C1 can be stably secured.

Further, as shown in FIG. 4, the punch 100 may be provided with a deflection inducing portion 185. The deflection-inducing portion 185 shown in the example of FIG. 4 is provided by forming a through hole 186 in the intermediate portion 180 between the upper blade 111 and the fixing portion 130. The flexural rigidity of such a deflection-inducing portion 185 is smaller than that of the other portions, and bending in the horizontal direction is likely to occur. Then, for example, when the upper blade 111 at the top dead center has a horizontal misalignment with respect to the lower blade 161, the misalignment is eliminated by guiding the guided portion 120 by the guide portion 170. .. In this embodiment, the movement of the upper blade 111 in the horizontal direction at this time can be appropriately absorbed by bending the bending-inducing portion 185. As a result, it is possible to suppress the occurrence of excessive bending stress in the vicinity of the upper blade 111 and secure an appropriate punching clearance C1.

Further, the deflection-inducing portion 185 shown in the example of FIG. 4 is formed by through holes 186 penetrating from the side wall 181 to the side wall 182 located at both ends in the Y-axis direction among the side walls of the intermediate portion 180 of the punch 100. .. In this way, when the bending-inducing portion 185 is provided by the through hole 186 formed in the direction perpendicular to the side wall 181 of the punch 100, the moment of inertia of area in the bending-inducing portion 185 of the punch 100 depends on the size of the through hole 186. The moment and buckling stress can be easily adjusted. Further, in the configuration in which the deflection-inducing portion 185 is provided by the through hole 186, the amount of deflection of the punch 100 due to the shearing force of the work piece 10 can be adjusted by the position, size, penetration direction, etc. of the through hole 186. Further, in the punch 100 of this embodiment, the thickness in the X-axis direction is thicker than the thickness in the Y-axis direction. That is, when the punch 100 is not provided with the through hole 186, the bending rigidity in the X-axis direction is higher than the bending rigidity in the Y-axis direction. Therefore, the through hole 186 related to the deflection inducing portion 185 is provided with the Y-axis direction as the depth direction in order to reduce the flexural rigidity in the X-axis direction. That is, by providing the through hole 186 extending in the thin direction, the flexural rigidity in the thick X-axis direction can be appropriately adjusted.

[Second Embodiment]
Next, a press mold different from the above embodiment will be described. The press mold of this embodiment is different from the above-described embodiment in the shape of the cutting process. Therefore, it has a different punch and die than the above embodiment. As for the configurations other than the upper die and the lower punch and die, the same ones as those of the above-described embodiment can be used. Therefore, regarding the press mold of this embodiment, the punch and die thereof will be described with reference to FIGS. 5 and 6.

FIG. 5 is an exploded perspective view of the punch 200 and the die 250 of the second mold 2 according to the present embodiment. FIG. 5 shows the punch 200 and the die 250 separated from each other in the Z-axis direction. Further, FIG. 5 also shows the material 80 to be processed. The material 80 to be processed is actually transported at a position closer to the upper surface of the die 250 than in the state shown in FIG. FIG. 6 is a diagram showing a cross section of the punch 200 and the die 250 on a plane orthogonal to the X-axis direction. FIG. 6 is a cross-sectional view of the second mold 2 at the bottom dead center of the slide movement.

As shown in FIG. 5, the punch 200 has an upper blade portion 210 having an upper blade 211 formed on a lower edge at a tip portion 201, and a guided portion 220. The guided portion 220 of the present embodiment is provided on both outer portions of the upper blade portion 110 in the Y-axis direction. Also in the punch 200, the upper blade 211 and the guided portion 220 are both integrally formed of the same member. In the punch 200 shown in FIG. 5, the upper end of the range of entering the inside of the entry hole 151 of the die 250 at the bottom dead center is indicated by a two-dot chain line. That is, at the time of cutting, both the upper blade portion 210 and the guided portion 220 of the punch 200 enter the inside of the entry hole 251.

The upper blades 211 are provided on the lower edges of the upper blade portion 210 located at both ends in the X-axis direction. Therefore, the punch 200 has two upper blades 211 that are separated in the X-axis direction.

The side surface of the guided portion 220 located on the outside is the guided surface 221. Specifically, the guided portion 220 has a guided surface 221 located at both ends in the X-axis direction and a guided surface 221 located at both ends in the Y-axis direction. As a result, the guided portion 220 of the punch 200 is also provided with four guided surfaces 221 facing in different directions in the horizontal direction orthogonal to the pressing direction.

The die 250 is formed with one entry hole 251 into which the tip portion 201 of the punch 200 enters, and a lower blade 261 that meshes with the upper blade 211 of the punch 200 is formed in the opening 252 above the entry hole 251. Has been done. In FIG. 5, the range in which the lower blade 261 is formed in the opening 252 of the entry hole 251 is shown by a thick alternate long and short dash line. Further, the range shown by the thick two-dot chain line in FIG. 5 for the entry hole 251 is the guide portion 270 that guides the guided portion 220. The guide portion 270 includes a guide surface 271 that is in sliding contact with the guided surface 221 of the guided portion 220.

When such a pressing operation between the punch 200 and the die 250 is performed, the upper blade 211 and the lower blade 261 perform a cutting process to form a slit 81 in the workpiece 80. .. In this embodiment, as shown in FIG. 5, two slits 81 separated in the X-axis direction can be formed in the work piece 80 by one pressing operation. The upper blade 211 and the lower blade 261 are narrower than the width of the work piece 80 in the Y-axis direction, and both ends in the width direction are not cut. Further, during the pressing operation, the lower surface 215 of the upper blade portion 210 presses the portion between the two slits 81 formed in the material 80 to be processed. As a result, the work piece 80 is bent along the shape of the lower surface 215 of the upper blade portion 210, and a recess 82 deformed in the press direction is formed. That is, in this embodiment, the punch 200 and the die 250 can be used to perform bending as well as cutting, and a pair of slits 81 and recesses 82 between them can be formed in the material 80 to be processed.

As shown in FIG. 6, also in the punch 200, the guided portion 220 protrudes below the upper blade 211, that is, toward the die 250, as in the above embodiment. FIG. 6 shows the entry depth K1 of the upper blade 211 into the entry hole 251 of the die 250 and the entry depth K2 of the guided portion 220 into the entry hole 251 at the bottom dead center of the punch 200. There is. Also in this embodiment, the approach depth K2 of the guided portion 220 at the bottom dead center is longer than the combined length of the approach depth K1 of the upper blade 211 and the thickness t of the work piece 80. .. Therefore, when the pressing operation is performed, the guided portion 220 can be made to enter the entry hole 251 before the upper blade 211 comes into contact with the workpiece 80. That is, the guided surface 221 of the guided portion 220 can be brought into sliding contact with the guide surface 271 of the guide portion 270 prior to the cutting process of the workpiece 80. As a result, the cutting process of the lumber 80 to be processed can be started while the guided portion 220 is already guided by the guide portion 270. Further, also in this embodiment, the sliding contact clearance C2 between the guided surface 221 of the guided portion 220 and the guide surface 271 of the guide portion 270 is formed to be smaller than the punching clearance C1 between the upper blade 211 and the lower blade 261. ing.

With such a configuration, also in this embodiment, the guide portion 220 formed integrally with the upper blade 211 can be moved in the horizontal direction directly by the guide portion 270 formed integrally with the lower blade 261. Can be regulated. Therefore, an appropriate punching clearance C1 between the upper blade 211 and the lower blade 261 can be secured at low cost. Further, the guided portion 220 of the punch 200 is provided with four guided surfaces 221 facing in different directions in the horizontal direction orthogonal to the press direction. That is, by providing three or more guided surfaces 221 formed so as to face different directions in the horizontal direction, the regulation of the guided portion 220 in all directions of 360 degrees in the horizontal cross section can be regulated at low cost with a simple configuration. Can be done.

Further, the guided portion 220 of the punch 200 is in sliding contact with the guide portion 270 of the die 250 in the Y-axis direction outside the outer edge in the width direction of the work material 80. Therefore, the guide of the guided portion 220 by the guide portion 270 is prevented from being disturbed by the work material 80. Further, it is preferable that the configuration of this embodiment is also applied to the work material 80 having a thickness t of 0.2 mm or less. This is because, in a general configuration in which the punch and the die are indirectly guided, a punching clearance C1 that is so small that it is difficult to secure the accuracy can be appropriately and stably secured. Further, also in this embodiment, it is preferable that the material of the punch 200 and the material of the punch retainer for fixing the punch 200 to the upper mold are the same. This is because the coefficients of thermal expansion of the punch 200 and the punch retainer can be made the same, and an appropriate punching clearance C1 can be maintained even when the punching is continuously performed.

Further, also in the punch 200 of the present embodiment, in order to secure an appropriate punching clearance C1 without applying excessive bending stress in the vicinity of the upper blade 211, a bending inducing portion is provided between the upper blade 211 and the fixed portion. You may leave it as it is. Further, the deflection-inducing portion can be provided by a through hole formed in the direction perpendicular to the surface of the side wall of the punch 200. Further, the punch 200 is thicker in the Y-axis direction than in the X-axis direction, and tends to have higher flexural rigidity in the Y-axis direction. Therefore, in the punch 200, it is conceivable to provide a deflection-inducing portion by forming at least a through hole extending in the X-axis direction. This is because the flexural rigidity in the Y-axis direction can be lowered and adjusted appropriately.

[Third Embodiment]
Next, a press mold different from the above embodiment will be described. The press mold of this embodiment is different from the above-described embodiment in the shape of the cutting process. Therefore, it has a different punch and die than the above embodiment. The press die of this embodiment is a progressive die that presses while transporting the material to be processed at a predetermined pitch in the transport direction. Then, a target punching shape is formed on the material to be processed by cutting different punching shapes on different stages provided at a predetermined pitch in the transport direction. Also in the press mold of this embodiment, the same configurations as those of the above-described embodiment can be used for the configurations other than the punch and the die. Therefore, the press mold of this embodiment will also be mainly described with reference to FIGS. 7 to 9 with respect to its punch and die.

FIG. 7 is a plan view of the punches 300, 400 and the die 350 of the third mold 3 according to the present embodiment. In FIG. 7, the configuration on the upper die side is shown by the cross section on the upper surface of the die 350 at the bottom dead center. Therefore, in FIG. 7, the configuration on the upper mold side is shown by hatching with diagonal lines. Further, the third mold 3 has a first stage S1 (front stage) and a second stage S2 (rear stage) as stages for punching the work material 90. The second stage S2 is located on the downstream side of the first stage S1 in the transport direction of the work piece 90. FIG. 8 is a diagram showing a front hole 93 punched in the first stage S1. FIG. 9 is a cross-sectional view at the bottom dead center of the punch 300 and the die 350 at the BB position shown in FIG. That is, FIG. 9 is a cross-sectional view of the first stage S1. FIG. 10 is a cross-sectional view at bottom dead center of the punch 400 and the die 350 at the CC position shown in FIG. That is, FIG. 10 is a cross-sectional view of the second stage S2.

In the present embodiment, as shown in FIG. 7, the material 90 is conveyed at a predetermined pitch in a state where meandering and the like are suppressed by the conveying guide 75 that guides in the width direction, and the punching process in the first stage S1 is performed. The punching process in the second stage S2 is performed in this order. As a result, the final target completed hole 94 formed in the regular punched shape 91 is formed. The completed hole 94 of this embodiment is square. Further, the third mold 3 is punched by the punch 300 in the first stage S1 and punched by the punch 400 in the second stage S2. In this embodiment, both the punch 300 and the punch 400 are provided in the same upper mold. That is, the punch 300 and the punch 400 can perform the pressing operation at the same time.

First, the configuration around the first stage S1 will be described in detail, and then the configuration around the second stage S2 will be described in detail. As shown in FIG. 9, the punch 300 according to the first stage S1 has an upper blade member 310 having an upper blade 311 formed at its tip, and a guided member 330 fixed to the upper blade member 310. There is. As shown in FIG. 7, in the punch 300, all the lower edges of the upper blade member 310 are upper blades 311. Further, the upper blade 311 includes a first upper blade 311A provided at a position corresponding to the regular punched shape 91 and a second upper blade 311B provided at a position inside the regular punched shape 91. The second upper blade 311B is retracted inward from the first upper blade 311A in the plan view. That is, the second upper blade 311B is located inward in the punch 300 with respect to the regular punched shape 91. In the punch 300 having a substantially square horizontal cross section, the first upper blades 311A are provided at corner pairs that are diagonally positioned with each other. The second upper blade 311B is provided on each of the other corner pairs having a diagonal positional relationship different from the corner pair on which the first upper blade 311A is provided.

Further, in the punch 300, as shown in FIG. 9, a guided member 330 having a guided portion 320 provided so as to straddle the workpiece 90 in the width direction is fixed to the upper blade member 310. The guided member 330 includes a guided member 330A provided on one side (right side in FIG. 9) of the upper blade member 310 and a guided member 330B provided on the other side (left side in FIG. 9) in the Y-axis direction. There is. The guided members 330A and 330B are fixed to the side surface of the upper blade member 310 on the root side opposite to the guided portion 320. A fitting convex portion 331 projecting toward the upper blade member 310 is provided at the root of each of the guided members 330A and 330B, and the fitting convex portion 331 is a fitting formed on the side surface of the upper blade member 310. It is fitted in the joint recess 340. As a result, the positions of the guided members 330A and 330B with respect to the upper blade member 310 are determined. That is, in this embodiment, the punch 300 is configured by directly connecting the upper blade member 310 provided with the upper blade 611 and the guided member 330 provided with the guided portion 320. That is, the punch 300 of this embodiment includes a guided portion 320 connected to the upper blade 311. As shown in FIG. 7, the side surface of the guided portion 320 is a guided surface 321 located on the outside. Specifically, the guided portion 320 has a guided surface 321 located on both outer sides in the X-axis direction and a guided surface 321 located on both outer sides in the Y-axis direction. As a result, the guided portion 320 of the punch 300 is also provided with four guided surfaces 221 facing in different directions in the horizontal direction orthogonal to the pressing direction.

The die 350 is formed with an entry hole 360 into which the upper blade 311 of the punch 300 enters at the position of the first stage S1. Further, as shown in FIG. 9, a lower blade 361 that meshes with the upper blade 311 of the punch 300 is formed in the opening on the upper side of the entry hole 360. Further, as shown in FIG. 7, the lower blade 361 is provided at a position corresponding to the regular punched shape 91, and the first lower blade 361A that meshes with the first upper blade 311A and a position inside the regular punched shape 91. There is a second lower blade 361B that is provided in the above and meshes with the second upper blade 311B. In this embodiment, the punching clearance between the first upper blade 311A and the first lower blade 361A and the punching clearance between the second upper blade 311B and the second lower blade 361B are both the same punching clearance C1.

Further, in the first stage S1 of the die 350, guide blocks 380 are fixed to both outer sides of the work piece 90 in the width direction. The guide block 380 includes a guide block 380A provided on the outside of one side (upper side in FIG. 7) in the width direction of the work piece 90, and a guide block 380B provided on the outer side of the other side (lower side in FIG. 7). There is. The positions of the guide blocks 380A and 380B with respect to the die 350 are determined by the two side surfaces of the guide blocks 380A and 380B contacting the side surfaces of the die 350. Further, both the guide blocks 380A and 380B are formed with a guide surface 371 that is in sliding contact with the guided surface 321 of the guided portion 320. Of the inner wall surfaces of the guide blocks 380A and 380B, the inner wall surface facing the guided surface 321 of the guided portion 320 is the guide surface 371. Therefore, the guided portion 320 is guided by entering the inside of the guide blocks 380A and 380B so that the guided surface 321 and the guide surface 371 are in sliding contact with each other. Therefore, in this embodiment, the guide blocks 380A and 380B constitute the guide portion 370 that guides the guided portion 320. Then, in this embodiment, the die 350 provided with the lower blade 361 and the guide portion 370 are directly connected. Therefore, the die 350 of this embodiment is connected to the lower blade 361 and includes a guide portion 370 that regulates the movement of the guided portion 320 in all directions in the horizontal direction orthogonal to the pressing direction. Regarding the inner wall surface 372 that does not face the guided surface 321, the gap between the inner wall surface 372 and the guided portion 320 is set to be larger than the sliding contact clearance C2 so as not to come into contact with the guided portion 320. Further, also in the first stage S1 of the present embodiment, the sliding contact clearance C2 between the guided surface 321 and the guide surface 371 is formed to be smaller than the punching clearance C1 between the upper blade 311 and the lower blade 361.

FIG. 8 shows a front hole 93 formed by punching with the upper blade 311 and the lower blade 361 in the first stage S1. The front hole 93 has a regular punching shape 91 that has been punched by the first upper blade 311A and the first lower blade 361A, and a regular punching shape that has been punched by the second upper blade 311B and the second lower blade 361B. It has a non-regular punched shape 92 located inside 91. Further, in FIG. 8, the regular punched shape 91 is shown by a two-dot chain line. As shown in FIG. 8, on the outside of the non-regular punched shape 92, there is a allowance 92A indicated by dot hatching between the non-regular punched shape 92 and the still unprocessed regular punched shape 91.

Further, FIG. 9 shows the approach depth K1 of the upper blade 311 into the approach hole 360 of the die 350 and the approach depth K2 of the guided portion 320 into the guide portion 370 at the bottom dead center of the punch 300. ing. Also in the first stage S1 of the present embodiment, the approach depth K2 of the guided portion 320 at the bottom dead center is longer than the combined length of the approach depth K1 of the upper blade 311 and the thickness t of the work piece 90. It is supposed to be. Therefore, when the pressing operation is performed, the guided portion 320 can be made to enter the approach hole 360 before the upper blade 311 comes into contact with the workpiece 90. That is, the guided surface 321 of the guided portion 320 can be brought into sliding contact with the guide surface 371 of the guide portion 370 prior to the cutting process of the workpiece 90. As a result, the cutting process of the lumber 90 to be processed can be started while the guided portion 320 is already guided by the guide portion 370.

Also in the first stage S1 of the present embodiment, the horizontal movement of the guided portion 320 provided in connection with the upper blade 311 is directly regulated by the guide portion 370 provided in connection with the lower blade 361. can do. Therefore, an appropriate punching clearance C1 between the upper blade 311 and the lower blade 361 can be secured at low cost. Further, the guided portion 320 of the punch 300 is provided with four guided surfaces 321 facing in different directions in the horizontal direction orthogonal to the press direction. That is, by providing three or more guided surfaces 321 formed so as to face different directions in the horizontal direction, the regulation of the guided portion 320 in all directions of 360 degrees in the horizontal cross section can be regulated at low cost with a simple configuration. Can be done. Further, the guided portion 320 included in the punch 300 is in sliding contact with the guide portion 370 included in the die 350 at the outer side of the outer edge in the width direction of the work material 90 in the Y-axis direction. Therefore, the guide of the guided portion 320 by the guide portion 370 is prevented from being disturbed by the work material 90.

Subsequently, the second stage S2 will be described. As shown in FIG. 10, the punch 400 according to the second stage S2 has an upper blade portion 410 and a guided portion 420 at its tip. The upper blade portion 410 has an upper blade 411 formed on the lower edge. In the punch 400, all the upper blades 411 are provided at positions corresponding to the regular punched shape 91. The guided portion 420 has a guided surface 421 on the side surface. As a result, the punch 400 includes a guided portion 420 formed integrally with the upper blade 411. As shown in FIG. 7, the guided surface 421 is located inward in the punch 400 with respect to the upper blade 411. In the punch 400 having a substantially square horizontal cross section, the upper blades 411 are provided at corner pairs that are diagonally positioned with each other. The guided surface 421 is provided on each of the other corner pairs having a diagonal positional relationship different from the corner pair on which the upper blade 411 is provided. As a result, the guided portion 420 of the punch 400 is provided with four guided surfaces 421 facing in different directions in the horizontal direction orthogonal to the press direction.

Further, the die 350 is formed with an entry hole 460 into which the tip end portion of the punch 400 enters at the position of the second stage S2. A lower blade 461 that meshes with the upper blade 411 is formed in a range corresponding to the upper blade 411 of the punch 400 in the upper opening of the entry hole 460 with a punching clearance C1 from the upper blade 411. On the other hand, in the approach hole 460, the range facing the guided surface 421 of the punch 400 is the guide portion 470 that guides the guided portion 420. The guide portion 470 includes a guide surface 471 that is in sliding contact with each of the guided surfaces 421 of the guided portion 420 at the sliding contact clearance C2. Therefore, the die 350 is provided with a guide portion 470 formed integrally with the lower blade 461 in the approach hole 460 and restricting the movement of the guided portion 420 in all directions in the horizontal direction orthogonal to the pressing direction. Further, also in the second stage S2 of the present embodiment, the sliding contact clearance C2 between the guided surface 421 and the guide surface 471 is formed to be smaller than the punching clearance C1 between the upper blade 411 and the lower blade 461.

The corner pair provided with the upper blade 411 of the punch 400 according to the second stage S2 corresponds to the corner pair provided with the second upper blade 311B in the punch 300 related to the first stage S1. .. Further, the range in which the upper blade 411 of the punch 400 is provided is longer than the range in which the second upper blade 311B is provided. Therefore, in the second stage S2, the upper blade 411 and the lower blade 461 re-pull the outer allowance 92A of the non-regular punched shape 92 shown in FIG. 8 left in the first stage S1. The regular punched shape 91 can be formed.

On the other hand, the corner pair provided with the guided surface 421 of the punch 400 according to the second stage S2 corresponds to the corner pair provided with the first upper blade 311A in the punch 300 related to the first stage S1. There is. As a result, in the second stage S2, the guided portion 420 of the punch 400 is guided by the guide portion 470 of the die 350 at the inside of the portion punched by the regular punching shape 91 in the first stage S1. can do. That is, in the second stage S2, the non-regular punched shape 92 is redrawn while the guided portion 420 is guided by the guide portion 470 at the position of the regular punched shape 91 of the front hole 93 formed in the first stage S1. It can be performed. By making the shape of the guided portion 420 of the punch 400 as close as possible to the regular punched shape 91, the portion of the regular punched shape 91 formed in the first stage S1 of the material 90 to be processed can be moved to the guided portion. It can be guided by 420. As a result, the alignment of the regular punched shape 91 punched in the first stage S1 and the regular punched shape 91 punched in the second stage S2 can be performed with high accuracy.

Further, FIG. 10 shows the approach depth K1 of the upper blade 411 into the approach hole 460 of the die 350 and the approach depth K2 of the guided portion 420 into the approach hole 460 at the bottom dead center of the punch 400. ing. Also in the second stage S2 of the present embodiment, the approach depth K2 of the guided portion 420 at the bottom dead center is longer than the combined length of the approach depth K1 of the upper blade 411 and the thickness t of the work piece 90. It is supposed to be. Therefore, when the pressing operation is performed, the guided portion 420 can be made to enter the approach hole 460 before the upper blade 411 comes into contact with the workpiece 90. That is, the guided surface 421 of the guided portion 420 can be brought into sliding contact with the guide surface 471 of the guide portion 470 prior to the cutting process of the workpiece 90. As a result, the cutting process of the lumber 90 to be processed can be started while the guided portion 420 is already guided by the guide portion 470.

Also in the second stage S2, the horizontal movement of the guided portion 420 integrally formed with the upper blade 411 can be directly regulated by the guide portion 470 integrally formed with the lower blade 461. Therefore, an appropriate punching clearance C1 between the upper blade 411 and the lower blade 461 can be secured at low cost. Further, the guided portion 420 of the punch 400 is provided with four guided surfaces 421 that are oriented in different directions in the horizontal direction orthogonal to the press direction. That is, by providing three or more guided surfaces 421 formed so as to face different directions in the horizontal direction, the regulation of the guided portion 420 in all directions of 360 degrees in the horizontal cross section can be regulated at low cost with a simple configuration. Can be done. In the second stage S2, the guided portion 420 of the punch 400 is in sliding contact with the guide portion 470 of the die 350 inward in the width direction of the work material 90. However, since the sliding contact portion is inside the punched portion in the first stage S1, the guide of the guided portion 420 by the guide portion 470 is prevented from being obstructed by the workpiece 90. There is.

Further, in the progressive die 3 according to the present embodiment, punching is performed in the first stage S1 and the second stage S2, respectively. As described above, in the progressive feed type, punching is performed on each of a plurality of stages provided at a predetermined pitch in the feed direction, and an assembly error such as a punch may occur in each stage. However, in the third mold 3 of the present embodiment, as described above, an appropriate punching clearance C1 between the upper blade 311 and the lower blade 361 in the first stage S1 is secured. The same applies to the second stage S2. That is, in the progressive die 3 that is press-processed in each of a plurality of stages, an appropriate punching clearance C1 can be easily and inexpensively secured in any of the stages.

Further, in the third mold 3, the front hole 93 is formed in the work piece 90 by the punching process in the first stage S1, and the regular punching shape 91 is completed by the punching process in the second stage S2. In such a case, in the second stage S2, a lateral force tends to be easily generated in the punch 400 that performs the punching process according to the non-regular punching shape 92 in the front hole 93. If the punch 400 is deformed by the lateral force, it becomes impossible to maintain an appropriate punching clearance C1 between the upper blade 411 and the lower blade 461. However, in this embodiment, the horizontal movement of the guided portion 420 integrally formed with the upper blade 411 can be directly regulated by the guide portion 470 integrally formed with the lower blade 461, which is appropriate. The punching clearance C1 can be maintained. In this embodiment, since the punched shape is square and the cutting portions are provided diagonally, the lateral forces tend to cancel each other out, and the deformation of the punch 400 is suppressed in the first place. However, it is considered that the effect is particularly large in a punched shape in which an eccentric load is generated with respect to the central axis of the punch, for example, in the case of a rectangle. This is because it is possible to prevent the punch from being twisted and deformed due to the eccentric load.

Further, it is preferable that the configuration of this embodiment is also applied to the work material 90 having a thickness t of 0.2 mm or less. In a general configuration that indirectly guides the punch and the die, a punching clearance C1 that is so small that it is difficult to secure the accuracy is appropriately and stably secured in the first stage S1 and the second stage S2. Because it can be done. Further, also in this embodiment, it is preferable that the materials of the punches 300 and 400 are the same as the materials of the punch retainers for fixing them to the upper mold, respectively. This is because these coefficients of thermal expansion can be made the same, and an appropriate punching clearance C1 can be maintained even when the press working is continuously performed. Further, also for the punches 300 and 400 of this embodiment, in order to secure an appropriate punching clearance C1 without applying excessive bending stress to the vicinity of the upper blade and the fixing portion to the upper mold, the upper blade and the fixing portion are used. A deflection-inducing portion may be provided between the two.

<Effect>
As described in detail above, the first mold 1, the second mold 2, and the third mold 3 according to the present embodiment are punches in which the upper blades 111, 211, 311 and 411 are formed on the upper mold. It has 100, 200, 300, 400. Further, the lower mold is provided with dies 150, 250, 350 on which lower blades 161, 261, 361, 461 are formed which mesh with the upper blades 111, 211, 311 and 411 to cut the workpieces 10, 80 and 90, respectively. Have. The punches 100, 200, 300, and 400 are provided with guided portions 120, 220, 320, and 420 (punch-side guide constituent portions) formed in connection with or integrally with the upper blades 111, 211, 311 and 411. The dies 150, 250, and 350 are provided with guide portions 170, 270, 370, and 470 (die-side guide constituent portions) formed in connection with or integrally with the lower blades 161, 261, 361, and 461. The guide portions 170, 270, 370, and 470 are in sliding contact with the guided portions 120, 220, 320, and 420 prior to the cutting process of the workpieces 10, 80, and 90, and are in all directions orthogonal to the pressing direction thereof. Regulate the movement of. The sliding contact clearance C2 is formed to be smaller than the punching clearance C1. As a result, the horizontal movement of the guided portions 120, 220, 320, 420 is regulated by the guide portions 170, 270, 370, and 470. The guided portions 120, 220, 320, and 420 are connected or integrally formed with the upper blades 111, 211, 311 and 411. The guide portions 170, 270, 370, and 470 are connected or integrally formed with the lower blades 161, 261, 361, and 461. That is, the punches 100, 200, 300, and 400 on which the upper blades 111, 211, 311 and 411 are formed can be directly regulated. Therefore, even if there is an assembly error between the punches 100, 200, 300, 400 and the upper die, and the dies 150, 250, 350 and the lower die, the upper blades 111, 211, 311 and 411 and the lower blades 161 and 261. An appropriate punching clearance C1 with 361 and 461 can be secured inexpensively and reliably. Therefore, a mold in which an appropriate punching clearance between the upper blade and the lower blade is secured at low cost is realized.

Further, the guided portions 120, 220, 320, and 420 of the first mold 1, the second mold 2, and the third mold 3 are formed to face in different directions in a direction orthogonal to the pressing direction. Three or more guide surfaces 121, 221 and 321 and 421 (guide constituent surfaces) are provided. As a result, the guided portions 120, 220, 320, and 420 can be regulated in all directions of 360 degrees with a simple configuration. Therefore, for example, the punching clearance C1 can be appropriately secured even for cutting a complicated shape.

Further, the punch 100 of the first mold 1 has a deflection-inducing portion 185 formed between the upper blade 111 and the fixing portion 130 so that the punch 100 can induce bending in a direction orthogonal to the pressing direction. It is equipped. As a result, when the punch 100 is misaligned, when the guided portion 120 is guided by the guide portion 170, the punch 100 is bent by the misalignment. Then, since the displacement is absorbed by the deflection inducing portion 185, the displacement can be easily corrected without affecting the upper blade 111 and the like. Similarly, bending-inducing portions can be provided for the punches 200, 300, and 400 of the second mold 2 and the third mold 3.

Further, the deflection-inducing portion 185 is provided by a through hole 186 formed in the direction perpendicular to the plane with respect to the side wall 181 of the punch 100. Thereby, the moment of inertia of area and the buckling stress of the punch 100 can be easily adjusted by the size of the through hole 186. Further, the amount of bending of the punch 100 due to the shearing force of the material 10 to be processed can be adjusted by the position, size, penetration direction and the like of the through hole 186. In this respect, the same can be applied to the case where the punches 200, 300, and 400 of the second mold 2 and the third mold 3 are provided with the deflection-inducing portion.

Further, in the first mold 1, since the punch 100 and the punch retainer 140 (retainer) are made of the same material, their thermal expansion coefficients are the same. The material of the punch 100 and the material of the punch retainer 140 may be combined so that the coefficient of thermal expansion approximates them. Even if the temperature of the punch 100 and the punch retainer 140 rises due to the frictional heat during press working, it is possible to prevent the formation of a gap between them by having the same or similar coefficients of thermal expansion. Therefore, the position of the punch 100 is less likely to shift even in continuous press working, and an appropriate punching clearance can be maintained. In this respect, the same applies to the punches 200, 300, and 400 of the second mold 2 and the third mold 3.

Further, the third die 3 is a progressive die that press-processes the work material 90 formed in a predetermined width while conveying it at a predetermined pitch. In such a progressive type, a plurality of processing stages are provided, and an assembly error between the punch and the die may occur for each stage. On the other hand, in each of the first stage S1 and the second stage S2, the punches 300 and 400 having the upper blades 311 and 411 can be directly guided to the die 350 having the lower blades 361 and 461, so that they can be appropriately pulled out. Clearance C1 can be secured.

Further, the third mold 3 is an upper blade 311 formed so that the front hole 93 can be punched in the work material 90 at the first stage S1 (front stage) on the upstream side in the feed direction of the work material 90. (First upper blade) is provided. Further, an upper blade 411 (second upper blade) formed so that a part of the removal allowance 92A of the front hole 93 can be punched out in the second stage S2 (rear stage) on the downstream side thereof is provided. In the first stage S1, a front hole 93 composed of a regular punched shape 91 and a non-regular punched shape 92 (rough punched shape) is formed. The upper blade 411 according to the second stage S2 re-pulls the non-regular punched shape 92 of the front hole 93 into the regular punched shape 91. Then, the guided portion 420 (second punch side guide component portion) integrally formed with the punch 400 (second punch) on which the upper blade 411 is formed is located at the position of the regular punched shape 91 of the front hole 93. , The lower blade 461 (second lower blade) is formed so as to be slidable with the guide portion 470 (second die side guide component) integrally formed with the formed die 350 (second die). There is. As a result, it is possible to secure an appropriate punching clearance C1 even in re-pulling where a lateral force is likely to be generated. The structure of the guided portion 420 may be provided on a member connected to a punch having an upper blade 411. Further, the structure of the guide portion 470 may also be provided on the member connected to the die having the lower blade 461.

Further, the upper blades 111, 211, and 311 of the punches 100, 200, and 300 of the first mold 1, the second mold 2, and the third mold 3 are located inside the outer edges of the workpieces 10, 80, and 90. It is formed so as to be meshable with the lower blades 161 and 261 and 361. The guided portions 120, 220, and 320 are formed so as to be slidable with the guide portions 170, 270, and 370 outside the outer edges of the materials 10, 80, and 90 to be processed. As a result, the guide portions 170, 270, and 370 can guide the guided portions 120, 220, and 320 without being disturbed by the workpieces 10, 80, and 90. That is, it is possible to secure an appropriate punching clearance C1 without being disturbed by the workpieces 10, 80, 90.

Further, when the first mold 1, the second mold 2, and the third mold 3 are applied to thin steel plates having a plate thickness of 0.2 mm or less as the materials to be processed 10, 80, 90, the cutting process is performed. good. Since the punching clearance C1 can be secured with high accuracy, it can be preferably used for press working of the workpieces 10, 80, 90 which are so small that the proper punching clearance C1 cannot be stably secured by the conventional general guide configuration. be.

[Modification example]
It should be noted that the present embodiment is merely an example and does not limit the present invention in any way. Therefore, as a matter of course, the present invention can be improved and modified in various ways without departing from the gist thereof. For example, in the above embodiment, an example of a press die for performing press working has been described in detail, but it can also be applied to other dies such as rotary molding. Further, in the above embodiment, with respect to the guide configuration in which one of the punch-side guide configuration and the die-side guide configuration guides the other, the guided portion is used as the punch-side guide configuration and the guide portion is used as the die-side guide configuration. The provided example has been described. However, on the contrary, a guide configuration may be provided in which a guide portion is provided as a punch-side guide component and a guided portion is provided as a die-side guide component.

Further, for example, when the coefficient of thermal expansion of the punch and the punch retainer is different, the coefficient of thermal expansion of the punch retainer is preferably smaller than the coefficient of thermal expansion of the punch. This is because it tends to be possible to prevent the formation of a gap between the punch and the punch retainer. Further, the structure in which the bending-inducing portion is provided in the punch does not necessarily have to be a through hole, and for example, a blind hole or a notch may be provided. However, from the viewpoint of inducing uniform and stable bending, it is preferable to provide a bending-inducing portion through a through hole.

Further, the punch described as having the guided structure integrally formed with the upper blade may be provided in different members for the upper blade and the guided portion, and these may be connected to each other. The reverse is also true. Similarly, on the die side, the lower blade and the guide portion may be provided on the same member, or may be configured by connecting different members. However, from the viewpoint of improving the punching clearance accuracy, it is preferable that the blade for cutting and the guide configuration thereof are integrally formed on the same member. This is because the assembly error can be eliminated. On the other hand, when the positions of the blade and the guide configuration are far apart, or when the shape of the blade is complicated, etc., these can be provided on different members and connected to each other to form an inexpensive structure. .. When the blade and the guide configuration are separate members, it is preferable to reduce the number of positionings interposed between the members provided with them as much as possible. This is because as the number of positionings intervening between them increases, the assembly error tends to accumulate and become a large error. That is, in the punch, it is preferable that the member directly connected to the member having the upper blade is provided with the guided portion. Further, also in the die, it is preferable that the member directly connected to the member having the lower blade is provided with the guide portion.

Further, the shapes and configurations of the punch, the upper blade, the guided portion and the like described in the above embodiment are merely examples, and other shapes and structures can be used. An example thereof will be described with reference to FIGS. 11 to 13. In addition, in FIGS. 11 to 13, only the cross section orthogonal to the press direction will be described.

FIG. 11 shows a punch 500, a die 550, and a work material 95 according to the first modification. In the first modification, the guided portion is provided on a member different from the upper blade, and the guided portion is provided with only three guided surfaces. In the punch 500, the upper blade member 510 on which the upper blade 511 is formed and the guided member 520 having three guided surfaces 521 formed so as to face different directions in a direction orthogonal to the pressing direction are connected to each other. It is configured. The upper blade member 510 and the guided member 520 are connected while being positioned by the key member 530. Further, the guided member 520 includes three guided surfaces 521. Further, the die 550 has an entry hole 551 formed therein, has a lower blade 561 with an upper blade 511 and a punching clearance C1, and is provided with a sliding contact clearance C2 with a guided surface 521 of the guided member 520. It has a guide portion 570 composed of three guide surfaces 571. Also in this first modification, the punching process having the same shape as that of the first embodiment can be performed on the lumber 95 to be processed. Since there are three guided surfaces 521 formed in directions orthogonal to the pressing direction and oriented in different directions, it is possible to regulate the movement of the guided member 520 in all directions orthogonal to the pressing direction, which is appropriate. A clear clearance C1 can be secured.

FIG. 12 shows the punch 600, the die 650, and the work material 96 according to the second modification. The second modification is an example in which the angles formed by the guided surfaces are not constant. The punch 600 has an upper blade portion 610 having an upper blade 611 and a guided portion 620 having four guided surfaces 621 formed in directions orthogonal to the pressing direction and facing different directions from each other. The upper blade 611 and the guided portion 620 are integrally formed on the same member. The guided portion 620 includes four guided surfaces 621. However, the angle between the adjacent guided surfaces 621 is not a right angle but an obtuse angle or an acute angle. Further, the die 650 has an entry hole 651 formed therein, has a lower blade 661 with an upper blade 611 and a punching clearance C1, and is provided with a sliding contact clearance C2 with a guided surface 621 of the guided portion 620. It has a guide portion 670 composed of four guide surfaces 671. Also in this second modification, the punching process having the same shape as that of the first embodiment can be performed on the lumber 96 to be processed. The guided surface 621 is formed so that the angle between the adjacent guided surfaces 621 is an obtuse angle or an acute angle, but is oriented in a direction orthogonal to the pressing direction and different from each other. There is no change in having three or more. Therefore, the movement of the guided portion 620 in all directions orthogonal to the pressing direction can be restricted, and an appropriate punching clearance C1 can be secured.

FIG. 13 shows a punch 700, a die 750, and a work material 97 according to a third modification. The third modification is an example in which a cylindrical portion is used as the guided portion. The punch 700 is formed by connecting the upper blade member 710 on which the upper blade 711 is formed while being positioned by fitting into the guided portion 720 having the guided surface 721 on the side surface. The guided portion 720 is composed of a cylindrical cylindrical member 725 and a detent member 726 fitted at a position on the cylindrical member 725 opposite to the upper blade member 710. In the guided portion 720, since the rotation position around the axis is not determined only by the cylindrical member 725, the rotation prevention member 726 is provided to function the two side surfaces 727 as positioning in the rotation direction. Further, the die 750 has an entry hole 751 formed therein, and has a lower blade 761 with an upper blade 711 and a punching clearance C1. Further, the die 750 has a guide surface 771 provided by the guided surface 721 and the sliding contact clearance C2, and a side guide 756 provided by the side surface 727 of the detent member 726 and the sliding contact clearance C2. The guide portion 770 of the guided portion 720 is formed by the guide surface 771 and the side guide 756. The groove portion 755 provided with the side guide 756 is formed to be deeper than the sliding contact clearance C2 with respect to the protruding height of the detent member 726. Also in this third modification, the punching process having the same shape as that of the first embodiment can be performed on the lumber 97 to be processed. Further, it is possible to regulate the movement of such a columnar guided portion in all directions orthogonal to the pressing direction. That is, the guided portion is not limited to a configuration in which there are three or more guided surfaces formed so as to face different directions, and it can be realized.

1 1st die 2 2nd die 3 3rd die 10, 80, 90 Work material 20 Upper die 30 Lower die 91 Regular punching shape 92 Non-regular punching shape (rough punching shape)
93 Front holes 100, 200, 300, 400 Punch 400 Punch (second punch)
111, 211, 311 and 411 Upper blade 311 Upper blade (first upper blade)
411 Upper blade (second upper blade)
120, 220, 320, 420 Guided part (punch side guide component part)
420 Guided part (second punch side guide component part)
121, 221, 321, 421 Guided surface (guide configuration surface)
130 Fixed part 140 Punch retainer (retainer)
150, 250, 350 Die 350 Die (2nd Die)
161, 261, 361, 461 Lower blade 461 Lower blade (second lower blade)
170, 270, 370, 470 Guide part (die side guide component part)
470 guide section (second die side guide component section)
181 Side wall 185 Flexion induction part 186 Through hole C1 Punching clearance C2 Sliding contact clearance S1 First stage (front stage)
S2 2nd stage (rear stage)

Claims (9)

A mold having an upper mold having a punch on which an upper blade is formed and a lower mold having a die on which a lower blade is formed to engage with the upper blade to cut a work material.
The punch includes a punch-side guide component formed in connection with or integrally with the upper blade.
All the dies that are connected or integrally formed with the lower blade, are in sliding contact with the punch side guide component portion prior to the cutting process of the work material, and are orthogonal to the press direction of the punch side guide component portion. Equipped with a die-side guide component that regulates movement in the direction,
A mold characterized in that the sliding contact clearance of the die-side guide component with respect to the punch-side guide component is smaller than the pull-out clearance of the lower blade with respect to the upper blade. In the mold according to claim 1,
The die is characterized in that the punch-side guide component portion is provided with at least three or more guide component surfaces formed in directions orthogonal to the press direction and facing directions different from each other. In the mold according to claim 1 or 2.
The punch is provided with a bending-inducing portion formed so as to be able to induce bending of the punch in a direction orthogonal to the pressing direction between the upper blade and the fixing portion fixed to the upper die. A mold featuring. In the mold according to claim 3,
The mold is characterized in that the deflection-inducing portion is provided by a through hole formed in the direction perpendicular to the surface of the side wall of the punch. In the mold according to any one of claims 1 to 4.
A mold characterized in that the coefficient of thermal expansion of the punch and the coefficient of thermal expansion of a retainer that fixes the punch to the upper mold are the same or similar. In the mold according to any one of claims 1 to 5.
A mold characterized by being a progressive die that presses while transporting a work material formed to a predetermined width at a predetermined pitch. In the mold according to claim 6,
A first upper blade formed by punching a front hole having a predetermined shape in the work material at the front stage on the upstream side in the feed direction of the work material, and a rear blade on the downstream side of the front stage. The stage is provided with a second upper blade formed so that a part of the front hole formed in the front stage can be punched out.
In the front stage, a front hole having a regular punched shape and a rough punched shape is formed.
For the second upper blade, the rough punched shape of the front hole is re-punched to the regular punched shape.
The second punch-side guide component formed jointly or integrally with the second punch on which the second upper blade is formed meshes with the second upper blade at the position of the regular punched shape of the front hole. A mold characterized in that a second lower blade is formed so as to be slidable with a second die-side guide component formed connected or integrally with a second die. In the mold according to any one of claims 1 to 7.
The upper blade is formed so as to be able to mesh with the lower blade inward from the outer edge of the work material.
The die is characterized in that the punch-side guide component is formed so as to be slidable with the die-side guide component on the outside of the outer edge of the material to be processed. In the mold according to any one of claims 1 to 8.
A mold characterized in that a thin steel plate having a plate thickness of 0.2 mm or less is used as a work material and the cutting process is performed.

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