A latch type blanking punch assembly and a stamping device

Abstract

The present application relates to the technical field of stamping, in particular to a latch type blanking punch assembly and a stamping device. The latch type blanking punch assembly comprises a blanking punch, a connecting piece and a clamping piece. The outer wall of the blanking punch has a stamping contour, and at least two first openings are arranged along the circumference of the stamping contour. The inner hole of the blanking punch is a through hole without steps. The inner wall of the connecting piece is a connecting hole matched with the outer contour of the blanking punch. The connecting piece is provided with second openings, and the number of the second openings is equal to that of the first openings. When the connecting piece is sleeved on the stamping contour of the blanking punch, the first openings and the second openings are aligned to form a clamping space, and the clamping piece is arranged in the clamping space to connect the connecting piece and the blanking punch. The problems of easy breakage of the existing blanking punch are solved, the service life of the blanking punch is improved, the processing cycle is shortened, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of stamping technology, in particular to a latch-type blanking punch assembly and a stamping device. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] Compared with traditional machining, stamping technology has the advantages of saving materials and energy, high efficiency, low technical requirements for operators, and the ability to produce products that cannot be achieved by machining through various mold applications. Therefore, its use is becoming more and more extensive.

[0004] In the gear stamping process, the existing blanking punch is as follows Figure 1 、 Figure 2 As shown, the end face of the blanking punch 1 has a bolt connection hole 11 connected to the punch press by bolts, and the opposite side has a punch hole 13 for matching the punch. Since the bolt connection hole needs to be set, the wall thickness of the blanking punch needs to be thickened on the side of the bolt connection hole, thereby setting a step 12.

[0005] During the gear stamping process, not only a large punching force is required, but also a large pulling force is required when withdrawing the blanking punch. However, in the existing blanking punch structure, the bolt connection holes are arranged too densely on the blanking punch, which affects the strength of the blanking punch, causing the blanking punch to break and shortening the blanking punch life (generally, after stamping hundreds of gears, the bolt connection holes of the blanking punch will be torn off). In addition, after the blanking punch of this structure is wire-cut, in order to ensure the relative position accuracy of the punch and the blanking punch, the punch hole needs to be precisely jig-ground, which leads to a long blanking punch processing cycle and high manufacturing cost. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the embodiment of the present invention is to provide a pin-type blanking punch assembly to solve the problem that the existing blanking punch is easy to break, increase the service life of the blanking punch, shorten the processing cycle, and reduce manufacturing costs.

[0007] A latch-type blanking punch assembly comprises: a blanking punch, a connecting piece and a clamping piece; the outer wall of the blanking punch has a stamping profile, and the outer wall of the blanking punch is provided with at least two first openings along the circumference of the stamping profile, and the inner hole of the blanking punch is a through hole without steps; the inner wall of the connecting piece is a connecting hole matching the outer profile of the blanking punch, and the connecting piece is provided with a second opening, and the number of the second openings is equal to the number of the first openings; when the connecting piece is sleeved on the stamping profile of the blanking punch, the first opening and the second opening are aligned to form a clamping space, and the clamping piece is placed in the clamping space to connect the connecting piece and the blanking punch.

[0008] In another preferred embodiment, the first opening is a pin groove, which is an arc-shaped notch on the stamping profile, and the length direction of the arc-shaped notch is perpendicular to the axis of the blanking punch and passes through the stamping profile; the second opening is a pin hole, and the axis of the pin hole is perpendicular to the axis of the connecting hole of the connecting piece; when the connecting piece is sleeved on the blanking punch, the pin groove is aligned with the pin hole to form a cylindrical hole-shaped clamping space.

[0009] In another preferred embodiment, the first opening is a first pin groove, which is a cylindrical opening groove on the stamping profile, and the axis of the cylindrical opening groove is perpendicular to the axis of the blanking punch but does not pass through the stamping profile; the second opening is a second pin groove, which is an opening groove arranged on the inner hole arm of the connecting piece and parallel to the axis of the connecting hole, the cross-section of the second pin groove is rectangular, and the root is an arc-shaped structure. When the connecting piece is sleeved on the blanking punch, the first pin groove and the second pin groove roots are aligned to form a cylindrical cavity-shaped clamping space.

[0010] An embodiment of the present invention further provides a punching device, comprising the latch-type blanking punch assembly as described above, wherein a punching head is installed in the punch hole of the blanking punch.

[0011] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0012] 1. The latch-type blanking punch assembly of the present invention incorporates a connector. A first opening is provided on the punch's stamping profile, and a second opening is provided on the inner hole of the connector. When the blanking punch and the connector are mated, the first and second openings align to form a snap-fit ​​space, which is then snapped together using the connector. This blanking punch assembly can utilize the connector to disperse bolt connection holes, positioning the bolt connection holes on the edge of the blanking punch or on the connector. The connector is then used to pull the blanking punch upward, preventing the blanking punch from breaking and extending its service life.

[0013] 2. The blanking punch assembly of the present invention is connected by a snap-fit ​​connection, eliminating the need for a step in the inner hole. Therefore, the punch hole and external tooth profile of the blanking punch can be formed in one pass using wire cutting, ensuring the positional accuracy of the punch hole and external tooth profile. This eliminates the need for additional jig grinding to process the punch hole, shortening the processing cycle and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0015] Figure 1 It is a schematic diagram of the existing blanking punch;

[0016] Figure 2 This is the existing blanking punch half-section diagram;

[0017] Figure 3 Schematic diagram of the blanking punch assembly according to the first embodiment of the present invention;

[0018] Figure 4 This is a half-section view of the blanking punch assembly of the first embodiment of the present invention;

[0019] Figure 5 This is a cross-sectional view of the matching relationship of the blanking punch assembly of the first embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of blanking, punching, and pinning in accordance with the first embodiment of the present invention;

[0021] Figure 7 Schematic diagram of the blanking punch of the first embodiment of the present invention;

[0022] Figure 8 Schematic diagram of the blanking punch assembly according to the second embodiment of the present invention;

[0023] Figure 9 is a half-section view of the blanking punch assembly of the second embodiment of the present invention;

[0024] Figure 10 This is a cross-sectional view of the matching relationship of the blanking punch assembly of the second embodiment of the present invention;

[0025] Figure 11 This is a schematic diagram of the cooperation between the blanking punch and the pin in the second embodiment of the present invention;

[0026] Figure 12 Schematic diagram of blanking punch according to the second embodiment of the present invention;

[0027] Figure 13 This is a schematic diagram of a connector according to a second embodiment of the present invention;

[0028] Figure 14 Schematic diagram of stamping a gear using the blanking punch assembly of the second embodiment of the present invention;

[0029] Figure: 1, blanking punch; 11, bolt connection hole; 12, step; 13, punch hole; 14, pin slot; 15, first pin slot; 2, connector; 21, pin hole; 23, second pin slot; 3, latch; 4, connecting pin; 5, punch head; 6, gear product; 7, ejector; 8, mother mold insert;

[0030] In order to show the positions of various parts, the distances or sizes between them are exaggerated. The schematic diagram is for reference only. DETAILED DESCRIPTION

[0031] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention. The terms "install", "connect", "connect", "fix" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meaning of the terms in the present invention can be understood according to the specific circumstances.

[0032] In the prior art, since the inner hole and outer tooth shape of the gear product are already fixed, the outer tooth shape of the blanking punch and the diameter of the punch hole are determined. In order to connect the blanking punch to the punch press, a step is provided on one side of the blanking punch, and a bolt connection hole is provided on the step surface. Since a large pulling force is required to pull out the blanking punch, the existing blanking punch structure is prone to breakage at the position of the bolt connection hole. If the number of bolt connection holes is reduced or the diameter of the bolt connection hole is reduced, the bolt will be broken, so the service life of the existing blanking punch is short. Since the inner hole and outer tooth shape of the gear product have high precision requirements, the punch hole and the outer tooth shape of the blanking punch are also required to have high positional accuracy. After the outer tooth shape of the blanking punch is cut online, the punch hole needs to be processed by coordinate grinding, which has a long processing cycle and high manufacturing cost. In order to solve the above technical problems, the present invention proposes a pin-type blanking punch assembly.

[0033] The latch-type blanking punch assembly includes: a blanking punch 1, a connecting piece 2 and a clamping piece; the outer wall of the blanking punch 1 has a stamping profile, and the outer wall of the blanking punch 1 is provided with at least two first openings along the circumference of the stamping profile, and the inner hole of the blanking punch 1 is a through hole without a step 12; the inner wall of the connecting piece 2 is a connecting hole matching the outer profile of the blanking punch 1, and the connecting piece 2 is provided with a second opening, and the number of the second openings is equal to the number of the first openings; when the connecting piece 2 is sleeved on the stamping profile of the blanking punch 1, the first opening and the second opening are aligned to form a clamping space, and the clamping piece is placed in the clamping space to connect the connecting piece 2 and the blanking punch 1.

[0034] The latch-type blanking punch assembly of the present invention adds a connector. A first opening is provided on the punching profile of the blanking punch, and a second opening is provided on the inner hole of the connector. When the blanking punch and the connector are mated, the first opening and the second opening align to form a snap-fit ​​space, and the blanking punch and the connector are snap-fitted together using the connector. The blanking punch assembly can use the connector to disperse the bolt connection holes, and the bolt connection holes can be set on the edge of the blanking punch or on the connector. The clip is used to pull the blanking punch upward, thus avoiding the problem of blanking punch breakage and extending the service life of the blanking punch.

[0035] The blanking punch assembly of the present invention is connected by a connector snap-on connection, eliminating the need for a step in the inner hole. Therefore, the punch hole and external tooth profile of the blanking punch can be formed in one pass using wire cutting, ensuring the positional accuracy of the punch hole and external tooth profile. This eliminates the need for additional jig grinding to process the punch hole, shortening the processing cycle and reducing manufacturing costs.

[0036] Example 1

[0037] like Figure 3-Figure 7 As shown, the first opening is a pin groove 14, which is an arc-shaped notch on the stamping profile. The length direction of the arc-shaped notch is perpendicular to the axis of the blanking punch 1 and passes through the stamping profile; the second opening is a pin hole 21, and the axis of the pin hole 21 is perpendicular to the axis of the connecting hole of the connecting member 2; when the connecting member 2 is sleeved on the blanking punch 1, the pin groove 14 is aligned with the pin hole 21 to form a cylindrical hole-shaped clamping space.

[0038] The connecting member is a cylindrical pin 3, which is inserted into the cylindrical hole-shaped connecting space formed by the pin slot 14 and the pin hole 21. Multiple bolt connection holes 11 are provided along the intersection of the blanking punch 1 and the connecting member 2. There are two pin slots 14, which are arranged parallel to each other on either side of the stamping profile.

[0039] The punch is connected to the punch press via a connector, which disperses the screws. A pin slot is added to the punch, and the punch and connector are mated together using a latch. The use of a latch-type punch solves the problem of threaded hole arrangement, reduces punch processing difficulty, lowers manufacturing costs, and increases punch life.

[0040] Example 2

[0041] Although the solution in Example 1 solves the problem of easy breakage of the blanking punch to a certain extent, the threaded hole is half on the punch and half on the fixed block. The thread strength is poor, and the thread damage at the threaded hole is easy to occur during the stamping process; at the same time, the pin shaft hole on the side is wire-cut after the connecting piece and the blanking punch are assembled. The two are processed together after matching, and the corresponding connecting hole cannot be reused after the service life of the blanking punch expires; moreover, since the concentricity of the external teeth and the center hole of the product needs to be adjusted during the production process, the blanking punch is rotated 90 degrees in the connecting piece to compensate for the position. The blanking punch of this solution cannot be rotated, and four types of blanking punches and connecting pieces for compensating concentricity are required, which is troublesome to adjust and wastes resources.

[0042] like Figures 8-13 As shown, the first opening is a first pin groove 15, which is a cylindrical opening groove on the stamping profile, and the axis of the cylindrical opening groove is perpendicular to the axis of the blanking punch 1 but does not pass through the stamping profile; the second opening is a second pin groove 23, which is an opening groove arranged on the inner hole arm of the connecting member 2 and parallel to the axis of the connecting hole. The cross-section of the second pin groove 23 is rectangular and the root is an arc-shaped structure. When the connecting member 2 is sleeved on the blanking punch 1, the first pin groove 15 is aligned with the root of the second pin groove 23 to form a cylindrical cavity-shaped clamping space.

[0043] The connector 2 is a plate-like structure with a bolt connection hole 11 disposed at each of its four corners. The connector 2 is a cylindrical pin that engages within the cylindrical engagement cavity formed at the base of the first pin slot 15 and the second pin slot 23. There are four first pin slots 15, distributed in an array along the circumference of the stamped profile.

[0044] A connecting piece is connected to the end of the blanking punch, and bolt connection holes are arranged at the four corners of the connecting piece. In the middle position where the blanking punch is connected to the connecting piece, a first pin groove is arranged on the outside of the blanking punch, perpendicular to the surface of the blanking punch. There are 4 first pin grooves evenly arranged circumferentially, and 4 second pin grooves are also evenly arranged circumferentially inside the connecting piece. When the connecting piece is connected to the blanking punch, the ends of the first pin groove and the second pin groove fit together to form a positioning hole. The blanking punch is connected to the connecting piece by inserting a pin into the positioning hole. The blanking punch formed in this way is subjected to uniform force, has low processing difficulty, and widens the distance between the screws, so that the service life is effectively improved.

[0045] Compared to the solution in Example 1, this solution: ① All threaded holes are moved to the periphery and modified to four larger (M8) threaded holes, which increases thread strength and provides greater tensile strength. ② The connector and blanking punch can be processed separately and then assembled. The connector can be reused, requiring only the blanking punch to be replaced. ③ The blanking punch can be rotated 90 degrees in the connector, making it easier to adjust the concentricity and making adjustments more convenient without occupying too many specifications.

[0046] Example 3

[0047] like Figure 14 As shown, the present invention also provides a stamping device, including the above-mentioned pin-type blanking punch assembly, a punching head 5 is installed in the punch hole of the blanking punch 1, and a pusher 7 is provided on the lower side of the blanking punch assembly. The blanking punch assembly and the pusher 7 are respectively located on both sides of the female mold block.

[0048] The blanking process is as follows: after the mold is closed, the punch head 5 first flanges the inner hole of the product to ensure the size requirements of the inner diameter, and then the blanking punch assembly and the mother mold block 8 shear the product gear 6 to complete the blanking. The mold is opened, and then the ejector 7 ejects the sheared product gear 6 out of the mother mold block 8.

[0049] The equipment and molds used are: Western wire cutting machine, 770-ton Feintool fine blanking machine, BR001 mold. The mold is stamped normally on the 770-ton Feintool fine blanking machine and its life is significantly improved.

[0050] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A latch-type blanking punch assembly, characterized in that: include: Blanking punches, connectors and clips; The outer wall of the blanking punch has a stamping profile, and the outer wall of the blanking punch is provided with at least two first openings along the circumference of the stamping profile, and the inner hole of the blanking punch is a through hole without a step; The inner wall of the connecting piece is a connecting hole that matches the outer contour of the blanking punch, and the connecting piece is provided with a second opening, the number of the second openings being equal to the number of the first openings; When the connecting piece is sleeved on the punching profile of the blanking punch, the first opening and the second opening are aligned to form a clamping space, and the clamping piece is placed in the clamping space to connect the connecting piece and the blanking punch; the bolt connection holes are dispersed by using the connecting piece, and the bolt connection holes are set on the edge of the blanking punch or on the connecting piece, and the blanking punch is pulled upward by using the clamping piece to avoid the problem of breakage of the blanking punch.

2. The latch-type blanking punch assembly according to claim 1, characterized in that: The first opening is a pin groove, which is an arc-shaped notch on the stamping profile. The length direction of the arc-shaped notch is perpendicular to the axis of the blanking punch and passes through the stamping profile; the second opening is a pin hole, and the axis of the pin hole is perpendicular to the axis of the connecting hole of the connecting piece; when the connecting piece is sleeved on the blanking punch, the pin groove and the pin hole are aligned to form a cylindrical hole-shaped clamping space.

3. The latch-type blanking punch assembly according to claim 2, characterized in that: The clamping piece is a cylindrical latch pin which is inserted into a cylindrical hole-shaped clamping space formed by the pin shaft groove and the pin shaft hole.

4. The latch-type blanking punch assembly according to claim 2, characterized in that: A plurality of bolt connection holes are arranged along the intersection of the blanking punch and the connecting piece.

5. The latch-type blanking punch assembly according to claim 2, characterized in that: There are two pin shaft grooves, which are arranged in parallel on both sides of the stamping profile.

6. The latch-type blanking punch assembly according to claim 1, characterized in that: The first opening is a first pin groove, which is a cylindrical opening groove on the stamping profile. The axis of the cylindrical opening groove is perpendicular to the axis of the blanking punch but does not pass through the stamping profile; the second opening is a second pin groove, which is an opening groove arranged on the inner hole arm of the connecting piece and parallel to the axis of the connecting hole. The cross-section of the second pin groove is rectangular and the root is an arc-shaped structure. When the connecting piece is sleeved on the blanking punch, the roots of the first pin groove and the second pin groove are aligned to form a cylindrical cavity-shaped clamping space.

7. The latch-type blanking punch assembly according to claim 6, characterized in that: The connecting piece is a plate-like structure, and a bolt connection hole is respectively provided on the four corners of the plate-like structure.

8. The latch-type blanking punch assembly according to claim 6, characterized in that: The connecting piece is a cylindrical pin, which is clamped in a cylindrical clamping cavity formed by the roots of the first pin groove and the second pin groove.

9. The latch-type blanking punch assembly according to claim 6, characterized in that: There are four first pin grooves, and the four first pin grooves are distributed in an array along the circumference of the stamping profile.

10. A punching device, characterized in that: It comprises the latch-type blanking punch assembly as described in any one of claims 1 to 9, and a punching head is installed in the punch hole of the blanking punch.

Images