Stamping die

Abstract

The invention provides a technology capable of suppressing contact between one of two cutting edges and the other cutting edge or a workpiece in a press die for processing the workpiece by using the two cutting edges. A press die is provided with: a first movable part that has a first blade that comes into contact with a workpiece, and that moves along a first axis; a second movable part having a second blade in contact with the workpiece, the second movable part moving along a second axis intersecting the first axis; a cam mechanism that moves the second movable part such that the second blade contacts the workpiece after the first blade contacts the workpiece; and a return mechanism that moves the second movable part such that the second blade is separated from the workpiece. The cam mechanism brings the second blade into contact with the workpiece in a state in which the second movable part supports the first movable part, and the reset mechanism moves the second movable part after the first movable part is separated from the second movable part.

Description

TECHNICAL FIELD

[0001] The present application relates to a press die. BACKGROUND

[0002] A press die is known in which, after a workpiece is subjected to bending work by a movable bending blade that moves up and down, the movable bending blade is pushed up and retracted, and the workpiece is further subjected to bending work by a closing bending blade that moves left and right (for example, Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. H5-031536 SUMMARY

[0004] In the related art, the one blade that is pushed up is lowered again to come into contact with the other blade or the workpiece, and thus there is a possibility that the other blade or the workpiece is damaged. Therefore, in a press die that subjects a workpiece to work using two blades, a technique that can inhibit the one blade of the two blades from coming into contact with the other blade or the workpiece is desired.

[0005] The present application can be implemented in the following manner.

[0006] (1) According to one embodiment of the present application, a press die is provided. The press die includes a first movable section having a first blade that comes into contact with a workpiece and that moves along a first axis, a second movable section having a second blade that comes into contact with the workpiece and that moves along a second axis that intersects the first axis, a cam mechanism that moves the second movable section in a manner such that the second blade comes into contact with the workpiece after the first blade comes into contact with the workpiece, and a reset mechanism that moves the second movable section in a manner such that the second blade is separated from the workpiece. The cam mechanism brings the second blade into contact with the workpiece in a state in which the first movable section is supported by the second movable section, and the reset mechanism moves the second movable section after the first movable section is separated from the second movable section.

[0007] The press die according to this embodiment moves the second movable section by the reset mechanism after the first movable section is separated from the second movable section, and thus can maintain the state in which the first movable section is supported by the second movable section until the first movable section is separated from the second movable section. Therefore, the first blade of the first movable section can be inhibited from coming into contact with the second blade of the second movable section or the workpiece.

[0008] (2) In the press die of the above-described aspect, the first movable portion can have a first inclined surface inclined with respect to the second axis and a first parallel surface disposed between the first blade and the first inclined surface and parallel to the second axis, the second movable portion can have a second parallel surface parallel to the second axis and a second inclined surface disposed between the second blade and the second parallel surface and inclined with respect to the second axis, the first blade can be separated from the workpiece by sliding of the first inclined surface and the second inclined surface, and the second blade can be brought into contact with the workpiece by sliding of the first parallel surface and the second parallel surface.

[0009] According to the press die of the above-described aspect, the second movable portion can support the first movable portion by contact of the first parallel surface and the second parallel surface. Thus, movement of the second movable portion by pressing of the first movable portion can be suppressed.

[0010] (3) In the press die of the above-described aspect, the reset mechanism can include a cylinder that moves the second movable portion.

[0011] According to the press die of the above-described aspect, the second movable portion can be moved with a simple structure.

[0012] (4) In the press die of the above-described aspect, the reset mechanism can include a mechanical valve that switches supply and discharge of air to and from the cylinder.

[0013] According to the press die of the above-described aspect, supply and discharge of air to and from the cylinder can be switched with a simple structure.

[0014] (5) In the press die of the above-described aspect, the mechanical valve can start discharging air from the cylinder at a time of contact with the cam mechanism and start supplying air to the cylinder at a time of separation from the cam mechanism.

[0015] According to the press die of the above-described aspect, supply and discharge of air to and from the cylinder can be switched at appropriate times. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a first explanatory diagram showing a structure of a press die.

[0017] Figure 2 is a second explanatory diagram showing a structure of a press die.

[0018] Figure 3 is a third explanatory diagram showing a structure of a press die.

[0019] Figure 4 is a fourth explanatory diagram showing a structure of a press die.

[0020] Figure 5 This is the fifth explanatory diagram showing the structure of a stamping die. Detailed Implementation

[0021] A. Implementation method: Figures 1 to 5 This is an explanatory diagram showing the structure of a stamping die 10 according to one embodiment of the present invention. (See diagram for reference.) Figure 1 As shown, the stamping die 10 in this embodiment includes an upper die (not shown), a lower die 12, a first movable part 30, a second movable part 40, a cam mechanism 50, and a reset mechanism 60. The stamping die 10 also includes a pressure pad 70 and a main cam 80. The stamping die 10 has mutually perpendicular intersecting front-rear axes X, left-right axes Y, and upper-lower axes Z. In addition, in this invention, the upper-lower axis Z is sometimes referred to as the first axis, and the left-right axis Y is sometimes referred to as the second axis.

[0022] The first movable part 30 has a first cutting edge 31 for bending workpiece WK, a first parallel surface 32 parallel to the horizontal plane, and a first inclined surface 33 inclined relative to the horizontal plane. The first cutting edge 31 is located at the lower left end of the first movable part 30. The first parallel surface 32 is located at the upper right of the first cutting edge 31. The first inclined surface 33 is located at the upper right of the first parallel surface 32. The first parallel surface 32 faces downward, and the first inclined surface 33 faces downward to the right. The first movable part 30 is fixed to the upper mold via an elastic member 35 that extends and retracts vertically, and moves together with the upper mold along the vertical axis Z. In this embodiment, the elastic member 35 is a gas spring filled with nitrogen. The elastic member 35 is not limited to a gas spring; for example, it can be a helical spring. Furthermore, in... Figures 2 to 5 In the diagram, the elastic member 35 is shown to illustrate its extension and contraction state, but... Figures 2 to 5 In the process, the position of the elastic component 35 is sometimes inaccurate.

[0023] The second movable part 40 has a second cutting edge 41 for bending workpiece WK, a second inclined surface 42 inclined relative to the horizontal plane, and a second parallel surface 43 parallel to the horizontal plane. The second cutting edge 41 is located at the left end of the second movable part 40. The second inclined surface 42 is located at the upper right of the second cutting edge 41. The second parallel surface 43 is located at the upper right of the second inclined surface 42. The second inclined surface 42 faces the upper left, and the second parallel surface 43 faces upward. The second movable part 40 is located between the first movable part 30 and the lower die 12, and moves to the left along the left-right axis Y via the cam mechanism 50, and moves to the right along the left-right axis Y via the reset mechanism 60.

[0024] The cam mechanism 50 includes a cam driver 51 and a cam slider 52. The cam driver 51 is fixed to the upper die and moves up and down with the upper die. The cam driver 51 is not fixed to the first movable portion 30. The cam slider 52 is disposed between the cam driver 51 and the lower die 12. The cam slider 52 is fixed to the second movable portion 40 and moves left and right with the second movable portion 40. The cam slider 52 and the second movable portion 40 can not be formed of different members, but can be formed of one member.

[0025] The cam driver 51 and the cam slider 52 have inclined surfaces inclined with respect to a horizontal plane. The inclined surface of the cam driver 51 faces downward and left, and the inclined surface of the cam slider 52 faces upward and right. If the cam driver 51 moves downward with the upper die, the inclined surface of the cam driver 51 comes into contact with the inclined surface of the cam slider 52. Therefore, if the cam driver 51 moves downward, the cam slider 52 is pressed by the cam driver 51 and moves left. On the other hand, if the cam driver 51 moves upward, the inclined surface of the cam driver 51 is separated from the inclined surface of the cam slider 52. Therefore, even if the cam driver 51 moves upward, the cam driver 51 does not move.

[0026] The reset mechanism 60 returns the second movable portion 40, which has moved left, to the original position. In the present embodiment, the reset mechanism 60 includes an air cylinder 61 which extends and contracts left and right, an air circuit 62, and a mechanical valve 63. The base end portion of the air cylinder 61 is fixed to the lower die 12, and the front end portion of the air cylinder 61 is in contact with the lower end portion of the second movable portion 40. The front end portion of the air cylinder 61 can be fixed to the second movable portion 40 or can not be fixed to the second movable portion 40. The air cylinder 61 is connected to an air supply source (not shown) via the air circuit 62. The air supply source is, for example, an air compressor.

[0027] The mechanical valve 63 is disposed on the travel path of the cam driver 51 and is fixed to the lower die 12. The mechanical valve 63 is in contact with the side portion of the cam driver 51. The mechanical valve 63 switches the air passage of the air circuit 62 so as to supply air to the air cylinder 61 during a period when the cam driver 51 is not in contact with the mechanical valve 63 and discharge air from the air cylinder 61 during a period when the cam driver 51 is in contact with the mechanical valve 63. In the present embodiment, the mechanical valve 63 is disposed so as to be in contact with the cam driver 51 which moves downward with the upper die at the time when the first blade 31 of the first movable portion 30 which moves downward with the upper die comes into contact with the workpiece WK.

[0028] The pressure pad 70 is disposed on the left side of the first movable portion 30. The pressure pad 70 is fixed to the upper die via an elastic member (not shown). The pressure pad 70 is fixed by sandwiching the workpiece WK with the lower die 12. During the period when the workpiece WK is bent by the first blade 31 and the second blade 41, the pressure pad 70 remains on the left side of the first movable portion 30. Figure 1the position shown, the pressure pad 70 retreats to a position further to the left than Figure 1 the position shown.

[0029] The main cam 80 is disposed to the left of the second movable section 40. The main cam 80 is configured to be able to move left and right. The main cam 80 supports the second blade 41 via the workpiece WK. During the period in which the workpiece WK is bent by the first blade 31 and the second blade 41, the main cam 80 stays at Figure 1 the position shown, the main cam 80 retreats to a position further to the left than Figure 1 the position shown.

[0030] Use Figures 1 to 5 The operation of the press die 10 will be described. As Figure 1 shown, in a state in which the workpiece WK is clamped by the pressure pad 70 and the lower die 12, the first movable section 30 and the cam driver 51 are lowered together with the upper die. The first blade 31 of the first movable section 30 comes into contact with the workpiece WK, and a first bending process of bending the workpiece WK with the first blade 31 is started. In addition, the first bending process can also be referred to as an upper bending process. In the present embodiment, before the first bending process is started, the cam driver 51 is not in contact with the mechanical valve 63. Therefore, the cylinder 61 is elongated, and movement of the second movable section 40 from the standby position at the right end to the left is suppressed. Also, in the present embodiment, before the first bending process is started, the cam driver 51 is not in contact with the cam slider 52. Therefore, at the start of the first bending process, the second movable section 40 stays at the standby position.

[0031] As Figure 2 shown, the first bending process is ended by the first blade 31 moving to the lowermost point. In the present embodiment, during the period from the start to the end of the first bending process, the cam driver 51 is in contact with the mechanical valve 63, and thus the cylinder 61 is able to contract. In other words, during the period from the start to the end of the first bending process, the second movable section 40 is able to move to the left from the standby position. After the cam driver 51 comes into contact with the mechanical valve 63, the second movable section 40 starts to move to the left from the standby position by the cam driver 51 coming into contact with the cam slider 52. By the second movable section 40 moving to the left, the cylinder 61 is pressed by the second movable section 40 and contracts, and the first inclined surface 33 comes into contact with the second inclined surface 42. The first movable section 30 and the second movable section 40 are configured such that, during the period in which the first inclined surface 33 and the second inclined surface 42 are in contact, the second blade 41 does not come into contact with the first movable section 30.

[0032] During the contact between the cam driver 51 and the cam slider 52, and between the first inclined surface 33 and the second inclined surface 42, the downward translational motion of the cam driver 51 is converted into a leftward translational motion of the cam slider 52, and the leftward translational motion of the second movable part 40, which moves together with the cam slider 52, is converted into an upward translational motion of the first movable part 30. Therefore, the more the cam driver 51 moves downward, the more the cam slider 52 and the second movable part 40 move to the left, and the more the second movable part 40 moves to the left, the more the first movable part 30 moves upward. As the first movable part 30 moves upward, the elastic member 35, which is held by the first movable part 30 and the upper die, contracts.

[0033] If the upper end of the second inclined surface 42 passes through the lower end of the first inclined surface 33, then the first parallel surface 32 contacts the second parallel surface 43. During the contact between the cam driver 51 and the cam slider 52 and the first parallel surface 32 and the second parallel surface 43, the downward translational motion of the cam driver 51 is converted into a leftward translational motion of the cam slider 52, but the leftward translational motion of the second movable part 40, which moves together with the cam slider 52, is not converted into an upward translational motion of the first movable part 30. Therefore, the more the cam driver 51 moves downward, the more the cam slider 52 and the second movable part 40 move to the left, but even if the second movable part 40 moves to the left, the first movable part 30 does not move up or down. In the state where the first parallel surface 32 and the second parallel surface 43 are in contact, the second cutting edge 41 contacts the workpiece WK. By the contact between the second cutting edge 41 and the workpiece WK, the second bending process of bending the workpiece WK with the second cutting edge 41 begins. Alternatively, the second bending process can also be referred to as the sub-bending process.

[0034] like Figure 3 As shown, the second bending process ends when the second blade 41 moves to the leftmost point. In this embodiment, during the period from the beginning to the end of the second bending process, the first movable part 30 is pressed downward by the restoring force of the elastic member 35, but because the first parallel surface 32 is supported by the second parallel surface 43, the first movable part 30 does not descend. Furthermore, in this embodiment, since the first parallel surface 32 and the second parallel surface 43 are parallel to the horizontal plane, the second movable part 40 does not move left or right due to the restoring force of the elastic member 35 during the period from the beginning to the end of the second bending process. In addition, the cylinder 61 does not extend during the period from the beginning to the end of the second bending process. Therefore, during the period from the beginning to the end of the second bending process, the first parallel surface 32 and the second parallel surface 43 remain in contact.

[0035] like Figure 4As shown, after the second bending process is completed, the upper die begins to rise. In this embodiment, if the upper die begins to rise, the elastic member 35, which is held by the upper die and the first movable part 30, extends. The first movable part 30 does not rise until the length of the elastic member 35 returns to its length before the start of the first bending process. Furthermore, in this embodiment, if the upper die begins to rise, the cam driver 51 also begins to rise along with the upper die. The cylinder 61 does not extend until the cam driver 51 separates from the mechanical valve 63. Therefore, the second movable part 40 does not move from the leftmost point until the cam driver 51 separates from the mechanical valve 63. In this embodiment, the cylinder 61 and the first movable part 30 begin to extend almost simultaneously, so as the first movable part 30 begins to rise, the first parallel surface 32 separates from the second parallel surface 43. The state in which the second parallel surface 43 supports the first parallel surface 32 is maintained until the first movable part 30 begins to rise.

[0036] like Figure 5 As shown, in this embodiment, if the first movable part 30 begins to rise, the cylinder 61 begins to extend. Due to the extension of the cylinder 61, the second movable part 40 moves to the right towards the waiting area. Then, if the upper die rises to a predetermined position, the pressure pad 70 rises, and the main cam 80 moves to the left. Therefore, the workpiece WK can be removed from the stamping die 10.

[0037] According to the stamping die 10 in this embodiment described above, after bending the workpiece WK by approaching the first cutting edge 31 of the first movable part 30 from above, bending the workpiece WK by approaching the second cutting edge 41 of the second movable part 40 from the right side via the cam mechanism 50 can be performed on the workpiece WK. Therefore, by one opening and closing action of the stamping die 10, bending of the workpiece WK can be performed from two directions.

[0038] Furthermore, in this embodiment, the first movable part 30 is pushed upward by sliding between the first inclined surface 33 provided on the first movable part 30 and the second inclined surface 42 provided on the second movable part 40. Therefore, a path can be ensured that the first cutting edge 31 is moved away from the workpiece WK while the second cutting edge 41 contacts the workpiece WK.

[0039] Furthermore, in this embodiment, after the first movable part 30 is pushed upward, the second cutting edge 41 contacts the workpiece WK by sliding between the first parallel surface 32 provided on the first movable part 30 and the second parallel surface 43 provided on the second movable part 40. When the first parallel surface 32 slides against the second parallel surface 43, the vertical position of the first movable part 30 does not change, thus suppressing an increase in the upward pushing amount of the first movable part 30. When the first movable part 30 is lifted, the elastic member 35 clamped between the upper die and the first movable part 30 simultaneously generates a stroke caused by the descent of the upper die and a stroke caused by the lifting of the first movable part 30. If the lifting amount of the first movable part 30 increases, the elastic member 35 needs to be lengthened, the height of the stamping die 10 increases, and the strength of the stamping die 10 may decrease. Without increasing the height of the stamping die 10, the elastic member 35 becomes longer, which may prevent the first movable part 30 from lowering its position when the stamping die 10 is opened, thus hindering the entry and exit of the workpiece WK. In this embodiment, the increase in the lifting amount of the first movable part 30 can be suppressed, thereby preventing these problems from occurring.

[0040] Here, if the first movable part 30, which has been pushed upward, descends again, the first cutting edge 31 may come into contact with the workpiece WK again, damaging the workpiece WK. To address this problem, in this embodiment, during the bending process of the workpiece WK by the second cutting edge 41, the first movable part 30 is supported by the second movable part 40, with the first parallel surface 32, which is parallel to the horizontal plane, in contact with the second parallel surface 43. Therefore, the movement of the second movable part 40 is suppressed by the restoring force of the elastic member 35, which is perpendicular to the horizontal plane, or by the weight of the first movable part 30 itself. Furthermore, in this embodiment, after the upper die rises and the first parallel surface 32 separates from the second parallel surface 43, the reset mechanism 60 pushes the second movable part 40 back to the standby position. Therefore, the state in which the first parallel surface 32 and the second parallel surface 43 are in contact can be maintained until the upper die rises and the first parallel surface 32 separates from the second parallel surface 43. Therefore, the descent of the raised first movable part 30 can be suppressed.

[0041] Furthermore, in this embodiment, the reset mechanism 60 includes a cylinder 61, which pushes the second movable part 40 back to the standby location. Therefore, the second movable part 40 can be pushed back to the standby location with a simple structure.

[0042] Furthermore, in this embodiment, the reset mechanism 60 includes a mechanical valve 63, which switches the supply and discharge of air to the cylinder 61. Therefore, the supply and discharge of air to the cylinder 61 can be switched with a simple structure.

[0043] Furthermore, in this embodiment, the mechanical valve 63 begins to discharge air from the cylinder 61 when the upper die descends and the cam driver 51 contacts the mechanical valve 63, and begins to supply air to the cylinder 61 when the upper die rises and the cam driver 51 separates from the mechanical valve 63. Therefore, it is possible to switch the air supply and discharge to the cylinder 61 at appropriate times.

[0044] B. Other implementation methods: (B1) In the above embodiment, the stamping die 10 is configured to perform bending processing on the workpiece WK by the first cutting edge 31 and the second cutting edge 41. In contrast, in other embodiments, the stamping die 10 may be configured to perform stamping processing on the workpiece WK by at least one of the first cutting edge 31 and the second cutting edge 41, other than bending. For example, the stamping die 10 may be configured to perform punching processing on the workpiece WK by one of the first cutting edge 31 and the second cutting edge 41, and bending processing on the workpiece WK by the other.

[0045] (B2) In the above embodiment, the reset mechanism 60 is configured to return the second movable part 40 to the standby location via a cylinder 61. In contrast, in other embodiments, the reset mechanism 60 may be configured to return the second movable part 40 to the standby location via a power cylinder other than a cylinder 61, such as an electric cylinder or a hydraulic cylinder.

[0046] (B3) In the above embodiment, the reset mechanism 60 includes a mechanical valve 63 that switches the supply and discharge of air to the cylinder 61 via a mechanical valve 63. In contrast, in other embodiments, the reset mechanism 60 may include, for example, a solenoid valve that switches the supply and discharge of air to the cylinder 61. In this case, for example, the solenoid valve can be controlled according to the position of the upper mold or cam driver 51 to switch the supply and discharge of air to the cylinder 61.

[0047] This invention is not limited to the embodiments described above, and can be implemented in various structures without departing from its spirit. For example, to address some or all of the above-described problems, or to achieve some or all of the above-described effects, technical features in embodiments corresponding to the technical features in the various methods described in the summary section of the invention can be appropriately replaced or combined. Furthermore, if a technical feature is not required to be described in this specification, it can be appropriately deleted.

[0048] Symbol Explanation 10-Stamping die, 12-Lower die, 30-First movable part, 31-First cutting edge, 32-First parallel surface, 33-First inclined surface, 35-Elastic component, 40-Second movable part, 41-Second cutting edge, 42-Second inclined surface, 43-Second parallel surface, 50-Cam mechanism, 51-Cam driver, 52-Cam slider, 60-Reset mechanism, 61-Cylinder, 62-Pneumatic circuit, 63-Mechanical valve, 70-Pressure pad, 80-Main cam, WK-Workpiece.

Claims

1. A stamping die characterized by, Possessing: a first movable portion having a first blade that contacts a workpiece and moves along a first axis; a second movable portion having a second blade that contacts the workpiece and moves along a second axis that intersects the first axis; a cam mechanism that moves the second movable portion in a manner that the second blade contacts the workpiece after the first blade contacts the workpiece; and a reset mechanism that moves the second movable portion in a manner that the second blade separates from the workpiece, the cam mechanism contacts the second blade with the workpiece in a state where the second movable portion supports the first movable portion, the reset mechanism moves the second movable portion after the first movable portion separates from the second movable portion.

2. The press die according to claim 1, wherein the first movable portion has a first inclined surface that is inclined with respect to the second axis, and a first parallel surface that is disposed between the first blade and the first inclined surface and is parallel to the second axis, the second movable portion has a second parallel surface that is parallel to the second axis, and a second inclined surface that is disposed between the second blade and the second parallel surface and is inclined with respect to the second axis, the first blade separates from the workpiece by sliding of the first inclined surface and the second inclined surface, the second blade contacts the workpiece by sliding of the first parallel surface and the second parallel surface.

3. The press die according to claim 1, wherein the reset mechanism has a pneumatic cylinder that moves the second movable portion.

4. The press die according to claim 3, wherein the reset mechanism has a mechanical valve that switches supply and discharge of air to and from the pneumatic cylinder.

5. The press die according to claim 4, wherein the mechanical valve starts discharging air from the pneumatic cylinder at a time of contact with the cam mechanism, and starts supplying air to the pneumatic cylinder at a time of separation from the cam mechanism. ​

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