Pitch positioning method and device for stamping die

Abstract

The invention discloses a pitch positioning method and device of a stamping die. The pitch positioning method comprises the following steps that an upper die base and a lower die base are closed, and a first convex hull integrally formed with a material belt is stamped in a waste area of the material belt; the upper die base and the lower die base are separated for die separation, the material belt is suitable for moving forwards until the first convex hull abuts against the pitch stop lever of the lower die base, and then pitch positioning of the material belt is achieved; the pitch positioning device is used for realizing the pitch positioning method. The stamping device has the beneficial effects that the integrally-formed convex hulls are formed on the material belt in a stamping mode, pitch positioning conveying of the material belt can be achieved, the conveying distance of each time is the distance of one pitch, and then the stamping precision is guaranteed; in addition, the convex hulls are located in the waste material area of the material belt, and therefore landing edges do not need to be reserved on the two sides of the material belt, material waste of the material belt is reduced, and production cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of stamping technology, and in particular to a method and device for pitch positioning of a stamping die. Background Art

[0002] For continuous stamping dies, it is necessary to be able to feed automatically, and the length of each feeding must be consistent, so pitch positioning is required: that is, positioning is performed by controlling the feeding distance to ensure the accuracy of stamping. The existing pitch positioning method is mainly: a certain width of overlap is reserved on both sides of the material strip, and a pitch block is used to block the positioning, and the feed amount is accurately controlled each time. However, this method will cause the overlap value at the edge of the material strip to be larger, that is, the overlap is wider, which will cause material waste of the material strip and high cost. For this reason, a pitch positioning method and device for a stamping die are proposed to solve the above technical problems. Summary of the invention

[0003] One of the purposes of the present application is to provide a pitch positioning method for a stamping die.

[0004] Another object of the present application is to provide a pitch positioning device for a stamping die.

[0005] To achieve the above objectives, the technical solution adopted in the present application is: a pitch positioning method for a stamping die, comprising the following steps: S100: the upper die seat and the lower die seat are molded together and a convex hump one integrally formed with the material strip is punched out in the waste area of ​​the material strip; S200: the upper die seat and the lower die seat are separated from the die, and the material strip is suitable for moving forward until the convex hump one is abutted against the pitch stop bar of the lower die seat, thereby achieving pitch positioning of the material strip; S300: the upper die seat and the lower die seat are molded together again and a convex hump two integrally formed with the material strip is punched out in the next waste area of ​​the material strip, and at this time the convex hump one is suitable for being flattened; S400: the upper die seat and the lower die seat are separated from the die again, and the material strip is suitable for moving forward a pitch distance, and at this time the convex hump two is abutted against the pitch stop bar; S500: steps S300 and S400 are repeated until the stamping process of the entire material strip is completed.

[0006] A pitch positioning device for a stamping die, used to implement the pitch positioning method of the above-mentioned stamping die, comprises an upper die base, a lower die base and a pitch stop rod, wherein a stamping head is arranged at the bottom end of the upper die base, a stamping groove cooperating with the stamping head is arranged at the top end of the lower die base, and the pitch stop rod is arranged on the lower die base; when performing stamping work, the upper die base cooperates with the lower die base, so that the waste area of ​​the material strip is punched out into a convex bulge integrally formed with the material strip under the action of the stamping head and the stamping groove, and the convex bulge cooperates with the pitch stop rod to achieve pitch positioning of the material strip.

[0007] Preferably, the surface of the convex hump close to the pitch stop rod is a plane, so that the convex hump and the pitch stop rod abut against each other to form a matching surface.

[0008] Preferably, the convex hull is a polygonal structure, and chamfer structures are provided between adjacent sides of the convex hull.

[0009] Preferably, the thickness of the material strip is H, the thickness of the convex hull is h, and 0.5H≦h≦0.7H.

[0010] Preferably, an elastic component is arranged in the lower die base; when the upper die base is separated from the lower die base, the convex bump is adapted to move upward under the action of elastic force and separate from the stamping groove.

[0011] Preferably, the elastic component includes a top block 1 and a top block 2, and the top block 1 and the top block 2 are both vertically slidably installed in the lower die base and connected to the lower die base through a nitrogen spring. The top block 1 is located in the stamping groove and cooperates with the convex bump, and the top block 2 cooperates with the material strip.

[0012] Preferably, a flattening block is provided in the lower die base; when the upper die base and the lower die base are closed again, the convex bump is adapted to be compressed to be flush with the material strip under the action of the flattening block.

[0013] Preferably, a tapping device is provided on the upper die base, and a positioning rod is provided in the lower die base; when performing stamping work, the tapping device is suitable for tapping the product area of ​​the material strip to produce threaded holes, and the positioning rod is suitable for cooperating with the threaded holes to limit the material strip.

[0014] Preferably, the top end of the positioning rod is in a conical structure, so that the top end of the positioning rod and the threaded hole are clearance-fitted.

[0015] Compared with the prior art, the beneficial effects of this application are: The present invention can realize pitch-positioned conveying of the material strip by stamping out an integrated convex hump on the material strip, so that the distance of each conveying is the distance of one pitch, thereby ensuring the accuracy of stamping; in addition, the convex hump is located in the waste area of ​​the material strip, so there is no need to reserve overlap edges on both sides of the material strip, thereby reducing material waste of the material strip and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the upper die base after separation of the present invention.

[0018] Figure 3 It is a schematic diagram of the material strip of the present invention being located in the lower die seat.

[0019] Figure 4 It is a schematic diagram of the specific structure of the material strip of the present invention.

[0020] Figure 5 It is a schematic diagram of the principle of the punching process of the material strip of the present invention.

[0021] Figure 6 It is a schematic diagram of the convex hull structure in the waste area of ​​the present invention.

[0022] Figure 7 It is a schematic diagram of the structure of the elastic component of the present invention.

[0023] Figure 8 It is a schematic diagram of the specific structure of the convex hull of the present invention.

[0024] Fig. 9 It is a schematic diagram of the thickness of the convex hull and the material strip of the present invention.

[0025] In the figure: 1. upper die base; 2. lower die base; 3. material strip; 301. product area; 302. waste area; 4. convex bump; 5. pitch stop rod; 6. elastic component; 601. top block 1; 602. top block 2; 603. nitrogen spring; 7. threaded hole; 8. positioning rod. DETAILED DESCRIPTION

[0026] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0029] One of the preferred embodiments of the present application is as follows: Figures 1 to 9As shown, a pitch positioning device for a stamping die includes an upper die base 1, a lower die base 2 and a pitch stop rod 5. A punch head (not shown) is arranged at the bottom end of the upper die base 1, a punch groove (not shown) cooperating with the punch head is arranged at the top end of the lower die base 2, and the pitch stop rod 5 is arranged in the lower die base 2.

[0030] It is understandable that when performing stamping work, Figure 1 As shown, the upper die base 1 and the lower die base 2 are closed to perform stamping work on the material strip 3, and the material strip 3 has a product area 301 and a waste area 302. At this time, the waste area 302 of the material strip 3 is punched out with a bulge 4 under the cooperation of the punching head and the punching groove. The bulge 4 and the material strip 3 are integrally formed, and the bulge 4 is the key to achieving the subsequent pitch positioning of the material strip 3.

[0031] Specifically, after the first stamping is completed, the upper die seat 1 will move up and separate from the lower die seat 2. At this time, the feeding module of the stamping die will transport the material strip 3 forward and perform stamping at the next station. Of course, the convex 4 will also move forward with the material strip 3. When the convex 4 and the pitch lever on the lower die seat 2 are matched, the material strip 3 will stop moving. By repeating the above process, the pitch positioning and conveying of the material strip 3 can be achieved, so that the distance of each conveying is the distance of one pitch, thereby ensuring the accuracy of the stamping. In addition, since the convex 4 is located in the waste area 302 of the material strip 3, there is no need to reserve overlaps on both sides of the material strip 3, thereby reducing material waste of the material strip 3 and reducing production costs.

[0032] It should be further explained that the convex 4 formed integrally with the material strip 3 can be understood as follows: there is no tear or tear between the convex 4 and the material strip 3, that is, the convex 4 is formed by the local deformation of the material in the waste area 302 under the action of the punch head and the punch groove during the stamping process. The connection strength between the convex 4 and the material strip 3 formed in this way is relatively high, so when the convex 4 and the pitch stopper 5 are subsequently abutted, the convex 4 is not easy to deform or fall off under the action of extrusion, thereby ensuring the stability and reliability of pitch positioning.

[0033] It should be known that in the prior art, a "tongue cutting" method is used for pitch positioning, that is, a tongue cutting punch is used to form a tongue cutting punch on the material strip 3. The tongue cutting, as the name implies, is in the shape of a tongue. The tongue cutting is connected to the material strip 3 on only one side. This method will cause a tear between the tongue cutting and the material strip 3. This method has the following shortcomings: first, the structure is unstable, and the tongue cutting is affected by the depth (height), so the pitch is not accurate. In addition, it is easy to produce slag falling, thereby increasing the difficulty of subsequent cleaning in the lower die base 2. At the same time, the tearing (mouth) method is also prone to produce filamentous iron filings, which is easy to damage the mold during the subsequent mold closing process.

[0034] Based on the above embodiments, we know that the abutment between the convex hump 4 and the pitch stop bar 5 affects the stability of subsequent positioning; for the punch head, it is generally best to adopt a circular structure, because the punch head with a circular structure is evenly stressed and can prevent stamping damage to the material strip 3; and at this time the convex hump 4 will also be circular, so at this time the convex hump 4 and the pitch stop bar 5 are in point contact, so the contact area between the two is small, which in turn affects the stability of positioning.

[0035] Therefore, in order to solve the above technical problems, in one embodiment of the present application, Figure 6 and Figure 8 As shown, the surface of the convex 4 close to the pitch stopper 5 is a plane (i.e., a non-curved structure), so that the convex 4 and the pitch stopper 5 can cooperate to form a matching surface, that is, at this time, the convex 4 and the pitch stopper 5 are in surface-to-surface contact, and the contact range is greatly increased, thereby improving the stability and reliability of positioning. In addition, the plane matching method can also effectively reduce the force of the convex 4 on the pitch stopper 5, thereby extending its service life.

[0036] Specifically, Figure 8 As shown, the convex hull 4 can be a polygonal structure, such as a rectangle (such as Figure 8 a in the figure), triangle (as shown in Figure 8 c), trapezoidal or semicircular structures (such as Figure 8 b in the figure), etc., but the surface that cooperates with the pitch stopper 5 must be a flat structure. Further, in order to ensure uniform force during subsequent stamping, a chamfered (rounded) corner structure is preferably provided between two adjacent sides of the convex hull 4, so as to avoid stress concentration and prevent the material strip 3 from being torn and damaged during stamping.

[0037] In a further embodiment, Fig. 9 As shown, in order to ensure the connection strength between the bulge 4 and the material strip 3, and the stability of the bulge 4 during subsequent use, the thickness h of the bulge 4 needs to be controlled within a certain range. Specifically, assuming the thickness of the material strip 3 is H, and the thickness of the bulge 4 is h, both should satisfy 0.5H≤h≤0.7H. Such a thickness design can not only ensure that the bulge 4 has sufficient strength and thickness to cooperate with the pitch stopper 5, but also avoid damage caused by excessive stamping depth of the material strip 3, and also ensure that the bulge 4 is not easy to break or fall off during the stamping process, thereby further improving the stability and reliability of pitch positioning. At the same time, the thickness condition design of the bulge 4 is also to prepare for the subsequent bulge 4 to be flattened and stepped back, so as to prevent the subsequent bulge 4 from falling off when flattened.

[0038] It should be noted that the material strip 3 of the present application is used when it is relatively thick. If the material strip 3 is thin, it is difficult to form an integrated convex hull 4. Even if the convex hull 4 can be formed, its strength and thickness may be insufficient to meet the requirements of pitch positioning. For thicker material strips 3, during the stamping process, the material in the waste area 302 can be fully deformed under the action of the stamping head and the stamping groove to form a convex hull 4 with sufficient strength and thickness.

[0039] In one of the embodiments of the present application, Figure 7 As shown, an elastic component 6 can be provided in the lower die base 2. It can be understood that after the upper die base 1 moves up and separates from the lower die base 2, the convex bump 4 will be located in the stamping groove, and through the setting of the elastic component 6, after the mold is opened, the convex bump 4 will move up under the action of elastic force and separate from the stamping groove, thereby preventing interference with the subsequent conveying of the material strip 3; such a design can also reduce the complexity of the feeding module in the stamping die, that is, the material strip 3 can reduce one lifting action.

[0040] Specifically, Figure 7 As shown, the elastic component 6 includes a top block 1 601 and a top block 2 602. Both the top block 1 601 and the top block 2 602 are vertically slidably installed in the lower die base 2 and are connected to the lower die base 2 through a nitrogen spring 603. The top block 1 601 is located in the stamping groove and cooperates with the convex bump 4, and the top block 2 602 cooperates with the material strip 3.

[0041] It is understandable that when the mold is closed, the nitrogen spring 603 is in a compressed energy storage state; after the mold is opened, the nitrogen spring 603 will act on the two top blocks to move up, at this time, the top block 1 601 pushes the convex bump 4 to move up and separate from the stamping groove, and the top block 2 602 pushes the material strip 3 to move up slightly, ensuring that there is no excessive friction between the material strip 3 and the lower die base 2, thereby facilitating the transportation of the feeding module. Of course, the feeding module is also common knowledge known to those skilled in the art. Such a design not only improves the stamping efficiency, but also ensures the stability of the stamping process.

[0042] In one embodiment of the present application, a flattening block (not shown) corresponding to the convex hump 4 may be provided in the lower die base 2. It is understandable that the convex hump 4 and the pitch stopper 5 are matched to achieve the fixed-distance conveyance of the material strip 3, and of course the cooperation between the two will also interfere with the conveyance of the material strip 3. Therefore, when the upper die base 1 and the lower die base 2 are molded again, the convex hump 4 that cooperates with the pitch stopper 5 will be compressed to be flush with the material strip 3 under the action of the flattening block, so that there will be no interference with the subsequent conveyance of the material strip 3.

[0043] Specifically in this application, the stamping die in this design is mainly used for stamping, cutting and tapping of products, that is, a tapping device (not shown) is also installed on the upper die base 1, and a positioning rod 8 (such as Figure 7 As shown). It can be understood that when the stamping work is performed, that is, after the upper die base 1 and the lower die base 2 are molded, the tapping device can tap the product area 301 of the material strip 3 to produce a threaded hole 7, and this threaded hole 7 can also play a role in limiting the material strip 3. Specifically, after the material strip 3 is conveyed, the threaded hole 7 will also move and convey. When the convex bulge 4 and the pitch stop rod 5 are abutted and matched, the threaded hole 7 corresponds to the positioning rod 8 at this time, and then after the subsequent mold is closed, the threaded hole 7 and the positioning rod 8 are plugged and matched to achieve further limiting of the material strip 3.

[0044] Furthermore, in order to improve the smoothness of the plug-in fit and positioning between the threaded hole 7 and the positioning rod 8, the top of the positioning rod 8 preferably adopts a conical structure, so that there is a clearance fit between the top of the positioning rod 8 and the threaded hole 7, and the positioning rod 8 can be more easily inserted into the threaded hole 7, reducing the resistance during fitting and improving the efficiency and accuracy of positioning. In addition, the positioning rod 8 with a conical structure can also correct the position of the material strip 3 to a certain extent, that is, when the threaded hole 7 and the positioning rod 8 correspond, the axis positions of the two may deviate, and when the positioning rod 8 is inserted into the threaded hole 7, the axis of the two can be coincident under the guiding effect of the positioning rod 8, so that the material strip 3 can be more accurately conveyed a pitch distance.

[0045] Another aspect of the present application further provides a method for pitch positioning of a stamping die, using the pitch positioning device of the stamping die, comprising the following steps: S100: The upper die base 1 and the lower die base 2 are firstly molded, that is, the punch head cooperates with the punching groove, and then a convex 4 (set as convex 1) which is integrally formed with the material strip 3 is punched out in the waste area 302 of the material strip 3. Of course, at this time, the tapping device also taps the corresponding threaded hole 7 in the product area 301 of the material strip 3. Figure 5 The Ⅰ process in .

[0046] S200: The upper die base 1 moves upward and separates from the lower die base 2. At this time, the convex bump 1 will be separated from the punching groove under the elastic force of the top block 1 601 and the nitrogen spring 603. Of course, the material strip 3 will also be lifted to a certain height under the elastic force of the top block 2 602 and the nitrogen spring 603, and then transported forward under the action of the feeding module. At the same time, the convex bump 1 will also move with the material strip 3 until it contacts the pitch stop bar 5, thereby achieving the pitch positioning of the material strip 3. Figure 5 II process in .

[0047] S300: At this time, the upper die base 1 and the lower die base 2 are closed again, that is, the punch head and the punching groove are matched again, and then the convex 4 (set as convex 2) which is integrated with the material strip 3 is punched again in the next waste area 302 of the material strip 3. Of course, the tapping device will also tap the corresponding threaded hole 7 in the next product area 301 of the material strip 3. At the same time, the original convex 1 is compressed and flattened to be flush with the material strip 3 under the action of the flattening block. This is to prevent the convex 1 from being locked under the limiting action of the pitch stop rod 5 after the mold is opened again, so as to facilitate the subsequent movement of the material strip 3. Figure 5 The III process in .

[0048] S400: At this time, the upper die base 1 and the lower die base 2 are separated from the mold again, and similarly, the material strip 3 will move forward a pitch distance, and then the convex bump 2 will be matched with the pitch stop rod 5 to achieve pitch positioning.

[0049] S500: Repeat the above steps S300 and S400 until the stamping process of the entire material strip 3 is completed.

[0050] It should be known that the subsequent convex bulge 3, convex bulge 4, convex bulge 5, etc. will repeat the above steps, that is, the stamping forming, pitch positioning and subsequent flattening and kicking back process will be performed; of course, in the subsequent S300, that is, after the upper die base 1 and the lower die base 2 are molded together, the waste area 302 corresponding to the flattened convex bulge 4 will be stamped and cut off after moving forward (that is, Figure 5 III process in the process).

[0051] It should be noted that the stamping die of the present application is mainly designed for products with in-mold tapping. By stamping and forming the convex hull 4 in the waste area 302, the subsequent pitch positioning is realized, and the subsequent positioning rod 8 is re-positioned to accurately realize the position of the tapping. In the past, at least ten taps were broken when producing a batch of products, and there was a risk of production not being able to proceed and there was a risk of delay. Now, through the design of the stamping die, the phenomenon of broken taps in the production process is greatly reduced and almost no longer occurs. At the same time, the production efficiency and stability of the product are also significantly improved. The mold not only simplifies the production process and reduces production costs, but also improves the quality and consistency of the product. In addition, the design of the mold also fully considers the convenience of operation and the simplicity of maintenance, so that operators can easily get started and reduce training costs and time. In general, the stamping die and its pitch positioning method are an efficient, stable and reliable production solution, which brings creative improvements to the production of in-mold tapping products.

[0052] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A pitch positioning method for a stamping die, characterized in that: The steps include: S100: the upper die base and the lower die base are molded together and a convex bump 1 which is integrally formed with the material strip is punched out in the waste area of ​​the material strip; S200: the upper die seat and the lower die seat are separated from each other, and the material strip is adapted to move forward until the convex bump abuts against the pitch stop bar of the lower die seat, thereby achieving pitch positioning of the material strip; S300: the upper die base and the lower die base are molded again and a convex hump 2 which is integrally formed with the material strip is punched out in the next waste area of ​​the material strip, and at this time, the convex hump 1 is suitable for being flattened; S400: the upper die base and the lower die base are separated from the mold again, and the material strip is adapted to move forward a distance of a pitch, and at this time, the second convex bump abuts against the pitch stop bar; S500: repeating step S300 and step S400 until the stamping process of the entire material strip is completed.

2. A pitch positioning device for a stamping die, used to implement the pitch positioning method for a stamping die as claimed in claim 1, characterized in that: include An upper die base, wherein a punch head is arranged at the bottom end of the upper die base; A lower die base, wherein a punching groove cooperating with the punching head is provided at the top of the lower die base; and A pitch stop rod is arranged on the lower die base; when performing stamping work, the upper die base cooperates with the lower die base, so that the waste area of ​​the material strip is punched out with a convex bump that is integrally formed with the material strip under the action of the stamping head and the stamping groove, and the convex bump cooperates with the pitch stop rod to achieve pitch positioning of the material strip.

3. The pitch positioning device for a stamping die according to claim 2, characterized in that: The surface of the convex hull close to the pitch stop rod is a plane, so that the convex hull and the pitch stop rod abut against each other to form a matching surface.

4. The pitch positioning device for a stamping die according to claim 3, characterized in that: The convex hull is a polygonal structure, and chamfer structures are arranged between adjacent sides of the convex hull.

5. The pitch positioning device for a stamping die according to claim 4, characterized in that: The thickness of the material strip is H, the thickness of the convex hull is h, and 0.5H≦h≦0.7H.

6. The pitch positioning device for a stamping die according to any one of claims 2 to 5, characterized in that: An elastic component is arranged in the lower die base; when the upper die base is separated from the lower die base, the convex bump is adapted to move upward under the action of elastic force and separate from the stamping groove.

7. The pitch positioning device for a stamping die according to claim 6, characterized in that: The elastic component includes a top block 1 and a top block 2, both of which are vertically slidably installed in the lower die base and connected to the lower die base through a nitrogen spring. The top block 1 is located in the stamping groove and cooperates with the convex bump, and the top block 2 cooperates with the material strip.

8. The pitch positioning device for a stamping die according to claim 6, characterized in that: A flattening block is arranged in the lower die base; when the upper die base and the lower die base are molded again, the convex bump is suitable for being compressed to be flush with the material strip under the action of the flattening block.

9. The pitch positioning device for a stamping die according to claim 8, characterized in that: A tapping device is provided on the upper die seat, and a positioning rod is provided in the lower die seat; when performing stamping work, the tapping device is suitable for tapping the product area of ​​the material strip to produce threaded holes, and the positioning rod is suitable for cooperating with the threaded holes to limit the material strip.

10. The pitch positioning device of a stamping die according to claim 9, characterized in that: The top end of the positioning rod is in a conical structure, so that the top end of the positioning rod and the threaded hole are clearance-matched.

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