High-precision stamping die for automobile sensor shell

Abstract

The utility model discloses a high-precision automobile sensor shell stamping die which comprises an upper die assembly and a lower die assembly, and the upper die assembly comprises an upper die set, an upper discharging plate, a blanking stretching punch-die and an upper die discharging block; the lower die assembly comprises a lower die set, a female die plate, a lower die discharging block, a stretching male die and a blanking male die. The inner surface of the female die plate, the stretching male die and the blanking male die define a waste cavity allowing the lower die discharging block to move up and down. The lower die discharging block is right opposite to the blanking stretching convex-concave die, a radial gap between the blanking stretching convex-concave die and the stretching convex die forms a product stretching space, the blanking stretching convex-concave die moves to the outer portion of the stretching convex die to stretch a material sheet, and the blanking stretching convex-concave die moves to the outer portion of the blanking convex die to shear a waste ring. According to the utility model, three procedures of blanking, stretching and trimming are integrated on one die, so that the equipment cost, the labor cost and the processing efficiency are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rail vehicle technical field especially relates to a high precision car sensor shell stamping die. BACKGROUND

[0002] The processing of the car sensor shell contains five steps, is cut respectively, blanking, drawing, trimming, punching, in the traditional craft, this five steps are completed in five processes, the first step cutting is that operating personnel cut the whole board into the width of the material belt 1 according to the process requirement (such as Figure 1 The second step blanking is that blanking die is used to stamp the material sheet 2 (such as Figure 2 The operating personnel push the material belt 1 into the die gradually in the operating process, the third step drawing is that operating personnel place the material sheet 2 in the specified position according to the die positioning device, and the product 3 is taken out by the chuck after starting the punch to draw, at this time, the product 3 has the radial protruding waste ring 4 (such as Figure 3 The fourth step trimming is that the product 3 is placed on the trimming die positioning column, and the operating personnel start the punch to carry out trimming operation, and the product 3 and the waste ring 4 are separated (such as Figure 4 The fifth step punching is that punching is carried out by using the punching die, and the finished product processing is completed (such as Figure 5 ).

[0003] The whole operating process needs to use a cutting machine, four machine tools and four dies, and at least four operating personnel process according to the process steps to finally complete the finished product processing.In addition to the requirements of equipment, die and personnel in the processing process, the processing time is also limited, each step process can be carried out next step, and the final product needs four process steps to be completed to end, and the whole processing process is time-consuming and low in processing efficiency.

[0004] The prior art also has the scheme that one die completes multiple steps, for example, the patent with the application number CN201120415092 and the name "blanking and drawing die with bottom cylinder structure" discloses that blanking and drawing actions are completed by one blanking and drawing die, but the function of the existing die is still too single, the trimming problem is not considered, and the die cannot be applied to the processing of the car sensor shell. INVENTION CONTENTS

[0005] In order to solve the technical problems that the car sensor shell needs five processes, the processing efficiency is low, the number of equipment is large, and the labor cost is high in the prior art, the utility model provides a high-precision car sensor shell stamping die to solve the above problems.

[0006] The utility model discloses a high-precision automobile sensor shell stamping die which solves the technical problems thereof, and adopts the technical scheme that an upper die assembly comprises an upper die group, an upper ejection plate, a blanking and drawing male and female die and an upper die ejection block.

[0007] A lower die assembly comprises a lower die group, a female die plate located above the lower die group, a lower die ejection block, a drawing male die and a blanking male die.

[0008] The lower die ejection block is opposite to the blanking and drawing male and female die, the blanking and drawing male and female die has a first through hole corresponding to the size of the product, the inner surface of the blanking and drawing male and female die and the outer surface of the drawing male die have a product drawing space, the blanking and drawing male and female die moves to the outside of the drawing male die to draw the material sheet, and the blanking and drawing male and female die moves to the outside of the blanking male die to cut the waste material ring.

[0009] Further, the upper die assembly further comprises a plurality of punching male dies corresponding to the holes of the finished product, and the punching male dies are located inside the blanking and drawing male and female die and can pass through the upper ejection block, the drawing male die and the blanking male die.

[0010] Further, the size of the first through hole is enlarged by 0.03 mm on one side than the size of the outer surface of the blanking male die.

[0011] Further, the top of the female die plate is fixed with positioning nails.

[0012] Further, the upper ejection plate and the upper die ejection block are connected with the upper die plate through springs, and the lower die ejection block is connected with the lower die plate through springs.

[0013] Further, the upper die group comprises an upper die seat, an upper backing plate, a first upper clamping plate and a second upper clamping plate which are fixed in sequence from top to bottom, the second upper clamping plate is provided with a second through hole for the blanking and drawing male and female die to insert, the blanking and drawing male and female die extends into the second through hole and is fixed with the second upper clamping plate, the first upper clamping plate is provided with a plurality of third through holes for the punching male dies to insert, and the punching male dies extend into the corresponding third through holes and are fixed with the first upper clamping plate.

[0014] Further, the size of the first through hole is enlarged by 0.02 mm on one side than the size of the outer surface of the upper die ejection block, and the size of the second through hole is enlarged by 0.02 mm on one side than the size of the outer surface of the blanking and drawing male and female die.

[0015] Further, the outer peripheral surface of the blanking and drawing punch-die is provided with a protruding part, and the wall surface of the second through hole is provided with a limiting slot matched with the protruding part.

[0016] Further, the lower die set comprises a lower base plate and a lower die seat fixed with each other, the die plate is fixed on the top of the lower base plate, and the top of the lower die seat is provided with a guide column, and the upper die seat is provided with a guide sleeve suitable for the insertion of the guide column.

[0017] Further, the length of the blanking and drawing punch-die is greater than the length of the protruding first upper clamping plate part of the punching punch.

[0018] The beneficial effects of the utility model are:

[0019] (1) The utility model integrates the blanking, drawing and trimming three processes in the same die, and only one punch, one die and one operator are needed to complete the three works, so that the equipment cost, labor cost and processing efficiency are greatly improved.

[0020] (2) The utility model also integrates the punching process in the die, and the product is formed in one step, and each product only needs to be punched once, so that the production efficiency is improved by 80%.

[0021] (3) The die can adopt automatic feeding, and the product is blown out by the air gun after processing, so that the operator's safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model will be further described below in combination with the drawings and examples.

[0023] Figure 1 It is the schematic diagram of the material belt after the first cutting by using the traditional process;

[0024] Figure 2 It is the blanking schematic diagram of the second step by using the traditional process;

[0025] Figure 3 It is the product schematic diagram after the third drawing by using the traditional process;

[0026] Figure 4 It is the separation schematic diagram after the fourth trimming by using the traditional process;

[0027] Figure 5 It is the finished product schematic diagram after the fifth punching by using the traditional process;

[0028] Figure 6 It is the schematic diagram of the high-precision automobile sensor shell stamping die of the utility model in the die opening state;

[0029] Figure 7 is the schematic view of the high-precision automobile sensor shell stamping die in the closed die state of the utility model;

[0030] Figure 8 is the front view of the second upper clamp plate in the utility model;

[0031] Figure 9 is the perspective view of the blanking and drawing punch-die in the utility model;

[0032] Figure 10 is the perspective view of the die plate in the utility model;

[0033] Figure 11 is the perspective view of the punch center hole punch in the utility model;

[0034] Figure 12 is the perspective view of the punch special-shaped hole punch in the utility model;

[0035] Figure 13 is the perspective view of the upper die ejection block in the utility model;

[0036] Figure 14 is the perspective view of the first upper clamp plate in the utility model;

[0037] Figure 15 is the perspective view of the drawing punch in the utility model;

[0038] Figure 16 is the perspective view of the blanking punch in the utility model.

[0039] In the figure, 1, material belt, 2, material sheet, 3, product, 4, waste circle, 5, upper die set, 501, upper die seat, 502, upper backing plate, 503, first upper clamp plate, 5031, third through hole, 504, second upper clamp plate, 5041, second through hole, 5042, limiting groove, 6, upper ejection plate, 7, blanking and drawing punch-die, 701, first through hole, 702, protruding part, 8, upper die ejection block, 9, lower die set, 901, lower backing plate, 902, lower die seat, 10, die plate, 1001, die hole, 11, lower die ejection block, 12, drawing punch, 13, blanking punch, 14, waste cavity, 15, guide column, 16, guide sleeve, 17, punch center hole punch, 1701, step, 18, punch special-shaped hole punch, 1801, protruding block, 19, special-shaped through hole, 20, round hole, 21, positioning nail. DETAILED DESCRIPTION

[0040] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0041] Example 1

[0042] like Figures 1-3 As shown, a high-precision automotive sensor housing stamping die includes an upper die assembly and a lower die assembly. The upper die assembly includes an upper die group 5, an upper stripper plate 6, a blanking and stretching punch and die 7, and an upper die stripper block 8; the upper stripper plate 6 slides with the outer surface of the blanking and stretching punch and die 7, the upper die stripper block 8 slides with the inner surface of the blanking and stretching punch and die 7, and the blanking and stretching punch and die 7 is fixed to the upper die group 5.

[0043] The lower die assembly includes a lower die set 9 and a concave die plate 10 located above the lower die set 9, a lower die unloading block 11, a stretching punch 12 and a blanking punch 13. The center of the concave die plate 10 has a die hole 1001. The structure of the concave die plate 10 is as follows: Figure 10 As shown, the stretching punch 12 is placed on the top of the blanking punch 13, and the outer diameter of the stretching punch 12 is smaller than the outer diameter of the blanking punch 13; the inner surface of the concave mold plate 10 and the stretching punch 12 and the blanking punch 13 form a waste cavity 14 for the lower mold unloading block 11 to move up and down.

[0044] The lower die unloading block 11 is directly opposite to the blanking and stretching punch and die 7. The blanking and stretching punch and die 7 has a first through hole 701 corresponding to the size of the product 3. The inner surface of the blanking and stretching punch and die 7 and the outer surface of the stretching punch 12 leave space for stretching the product 3. The blanking and stretching punch and die 7 moves to the outside of the stretching punch 12 to stretch the material sheet 2, and the blanking and stretching punch and die 7 moves to the outside of the blanking punch 13 to shear the waste ring 4.

[0045] like Figure 6 As shown in FIG, in the mold opening state, the upper unloading plate 6 and the upper mold unloading block 8 are located at the bottom, and the lower mold unloading block 11 is located at the top. Figure 7As shown, the upper stripper plate 6 slides upward, the blank drawing stretch male and female die 7 and the lower die stripper block 11 are connected and push the lower die stripper block 11 downward, the lower die stripper block 11 slides outside the stretch male die 12 and the blank male die 13, and plays a role of regularizing the two dies. At this time, the blank drawing stretch male and female die 7 gradually extends into the blank die hole 1001 of the blank die plate 10, and there is a shearing force between the outer surface of the blank drawing stretch male and female die 7 and the blank die plate 10, which separates the sheet 2 from the material belt 1, and at the same time, the sheet 2 is stretched to form the product 3 in the gap between the blank drawing stretch male and female die 7 and the stretch male die 12. When the blank drawing stretch male and female die 7 moves downward to the outside of the blank male die 13, there is a shearing force between the blank drawing stretch male and female die 7 and the blank male die 13, which cuts off the waste ring 4 at the edge of the product 3, and the waste ring 4 falls into the waste cavity 14, and finally leaks out from the lower die set 9.

[0046] The upper stripper plate 6, the upper die stripper block 8 and the lower die stripper block 11 can be connected by springs, which are not shown in the figure.

[0047] The embodiment can integrate the three processes of blanking, stretching and trimming on the same die, and only one punch, one die and one operator are needed to complete the three works, and the last punching process needs to be completed separately. Compared with the traditional process, the equipment cost, labor cost and processing efficiency are greatly improved.

[0048] The upper die set 5 usually includes an upper die seat 501, an upper pad plate 502, a first upper clamping plate 503 and a second upper clamping plate 504 fixed in sequence from top to bottom, and the second upper clamping plate 504 is provided with a second through hole 5041 for the blank drawing stretch male and female die 7 to insert, and the blank drawing stretch male and female die 7 extends into the second through hole 5041 and is fixed with the second upper clamping plate 504. Figure 9 As shown, the blank drawing stretch male and female die 7 is a square column, the first through hole 701 is a square hole with the same shape as the product 3, and the size of the first through hole 701 is preferably enlarged by 0.03mm on one side than the size of the outer surface of the blank male die 13, so that the blank drawing stretch male and female die 7 can move up and down relative to the blank male die 13 and shear the sheet 2.

[0049] The fixing of the blank drawing stretch male and female die 7 and the second upper clamping plate 504 can be achieved by structure limiting, as shown in Figure 8 and Figure 9 As shown, the outer circumferential surface of the blank drawing stretch male and female die 7 is provided with a protruding part 702, and the wall surface of the second through hole 5041 is provided with a limiting groove 5042 matched with the protruding part 702.

[0050] For the size relationship between several components of relative sliding, the size of the first through hole 701 in the blanking and drawing punch-die 7 is enlarged by 0.02mm on one side than the size of the outer surface of the upper die stripper 8, and the size of the second through hole 5041 in the upper stripper plate 6 is enlarged by 0.02mm on one side than the size of the outer surface of the blanking and drawing punch-die 7.

[0051] The lower die set 9 generally comprises a lower bolster plate 901 and a lower die seat 902 fixed to each other, and the die plate 10 is fixed to the top of the lower bolster plate 901. In order to ensure the straightness of the up-down movement of the upper die set, a guide column 15 is preferably arranged on the top of the lower die seat 902, and the upper die seat 501 is provided with a guide sleeve 16 suitable for the insertion of the guide column 15. The guide column 15 is inserted into the guide sleeve 16 before the mold is completely closed, and the alignment and guidance of the upper die set and the lower die set are realized through the cooperation of the guide column 15 and the guide sleeve 16.

[0052] In further designs, a plurality of positioning nails 21 are further fixed to the top of the die plate 10, which can limit the displacement of the material strip 1 and ensure the accuracy of the stamping position.

[0053] Embodiment Two

[0054] On the basis of the above-mentioned embodiments, the upper die set further comprises a plurality of punching punch dies corresponding to the holes of the finished product, and the punching punch dies are located inside the blanking and drawing punch-die 7 and can pass through the upper die stripper 8, the drawing punch 12 and the blanking punch 13.

[0055] When the mold is closed, the blanking and drawing punch-die 7 and the lower die stripper 11 are in abutment and push the lower die stripper 11 downward, the blanking and drawing punch-die 7 gradually extends into the die hole 1001 of the die plate 10, and the material strip 1 is stamped into a material sheet 2 and a stretched product 3, and the punching punch dies are simultaneously embedded in the upper die stripper 8, the drawing punch 12 and the drawing punch 12, so that the material sheet 2 is punched while the material strip 1 is stamped and stretched, and the waste of punching is leaked out through the lower bolster plate 901 and the lower die seat 902.

[0056] The embodiment integrates the punching process in the mold, and can realize one-step forming of the product 3, and each product 3 only needs to be stamped once by the punch press.

[0057] When installing, as shown in Figure 7 and Figure 14 The first upper clamping plate 503 is provided with a plurality of third through holes 5031 for the insertion of the punching punch dies, and the punching punch dies are fixed to the first upper clamping plate 503 by extending into the corresponding third through holes 5031.

[0058] For the automobile sensor shell to be processed by the utility model, the punching punch dies have two types, one is a center hole punching punch die 17, and the other is a special-shaped hole punching punch die 18. The center hole punching punch die 17 is used for machining the hole at the center of the product 3, and the structure is as shown in Figure 11As shown, the end is provided with a step 1701, which has the same effect as the protrusion 702 outside the blanking and drawing male and female dies 7, and is used for limiting the first upper clamping plate 503. The punch irregular hole punch 18 is used to process the holes in other parts of the end face of the product 3. The punch irregular hole punch 18 is also a columnar structure, but the end face shape is irregular, as shown in the figure. At this time, it is difficult to process a circle of steps 1701 at one end, so the punch irregular hole punch 18 is selected to be provided with the same protrusion 1801 as the protrusion 702, so as to realize the limiting of the punch irregular hole punch 18 and the first upper clamping plate 503. Figure 12

[0059] Correspondingly, the structure of the upper die ejection block 8, the drawing punch 12 and the drawing punch 12 is respectively shown in Figure 13 、 Figure 15 and Figure 16 The three have the same shape structure, only the height and the length and width size are different, and are provided with a round hole 20 for the punch center hole punch 17 to pass through and an irregular hole 19 for the punch irregular hole punch 18 to pass through. The drawing punch 12 and the drawing punch 12 are provided with positioning holes for fixed installation.

[0060] From the punching timing analysis, the relative length of the punching punch and the blanking and drawing male and female dies 7 determines the timing of the punching. If the length of the blanking and drawing male and female dies 7 is less than the length of the part of the punching punch protruding from the first upper clamping plate 503, the punching is performed first, and then the material sheet 2 is pressed. At this time, the edge of the material sheet 2 is not completely pressed, which will lead to low punching position precision. Therefore, the length of the blanking and drawing male and female dies 7 is preferably greater than the length of the part of the punching punch protruding from the first upper clamping plate 503, that is, the material is first cut and pressed by the blanking and drawing male and female dies, and then the stretching and punching operation is performed.

[0061] The utility model adopts the way of synchronous processing, integrates the dies of four processes of blanking, stretching, trimming and punching, and completes the four processes at the same time to complete the finished product processing. When the material uses the directly processed coil material (the material width processing has been completed by the supplier), the cutting step is reduced. The operation can be completed by one operator using one die on one machine tool.

[0062] In summary, the stamping die has the following advantages compared with the traditional processing automobile sensor shell die:

[0063] ​1. Product quality is improved. The traditional shaping die adopts the operation personnel to hold the core rod to start the punch to perform the shaping operation, and the operation skill and operation specification of the operation personnel are high, and once the operation personnel has deviation in the operation process, the shaping product quality has certain difference. The utility model discloses a one-time forming process, which greatly improves the consistency of the product, and after the die is used, the personnel do not directly participate in the shaping activity, only assist the early loading operation, the personnel have little influence on the shaping product quality, reduce the key factor of instability, and reduce the probability of defective products.

[0064] 2. Production efficiency is improved, and single-piece cost is reduced. The original production process adopts a multi-step processing method, which is divided into five processing steps, and after the previous processing step is completed, the next step can be transferred, and the production time is long. The new process adopts one-step forming, and each product only needs to be punched once, and the production efficiency is improved by 80%. Although the scheme of the utility model discloses increases a certain proportion of cost in die manufacturing, but the direct economic benefit generated is more than 60%, the die is more stable, the shaping speed is improved by 50%, the die life is greatly prolonged, and the single-piece shaping cost is reduced.

[0065] 3. Safety is improved. The original production process needs the operation personnel to manually participate in the processing process to take the material sheet or semi-finished product in the cutting, blanking, drawing, edge cutting and punching process, and the probability of injury of the operation personnel caused by misoperation is extremely high. The scheme in the utility model mainly solves the problem that the operation personnel participate in the equipment operation in the shaping process, changes the operation personnel directly participating in the shaping operation to the die independently completing the shaping operation, effectively reduces the contact of the personnel with the punch and the shaping die, and thus guarantees the personal safety of the operation personnel. In the product shaping process, the operation personnel only need to place the product in the specified die core position before the equipment starts, and the die independently completes the shaping and discharging operation after the equipment starts, and the operation personnel do not participate, so that the risk of the die pressing the hands of the operation personnel is effectively avoided.

[0066] In the description of the utility model, it is understood that the terms "center", "length", "width", "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as a limitation on the utility model.

[0067] In addition, the terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance.

[0068] In this specification, illustrative statements about the terminology do not necessarily refer to the same embodiment. Moreover, specific features, structures, materials, or characteristics described can be combined in any one or more embodiments.

[0069] The above is the ideal embodiment according to the present application, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A high-precision stamping die for an automobile sensor housing, characterized by, The utility model relates to a kind of blanking and drawing moulds, including: Upper die assembly, the upper die assembly includes upper die group (5), upper stripper plate (6), blanking and drawing punch-die (7) and upper die stripper block (8);Upper stripper plate (6) and blanking and drawing punch-die (7) outer surface sliding fit, upper die stripper block (8) and blanking and drawing punch-die (7) inner surface sliding fit, blanking and drawing punch-die (7) and upper die group (5) are fixed; Lower die assembly, the lower die assembly includes lower die group (9) and located in the upper die of recessed die plate (10), lower die stripper block (11), drawing punch (12) and blanking punch (13), the recessed die plate (10) center has recessed die hole (1001), the drawing punch (12) is placed on the top of blanking punch (13), and the outer diameter of drawing punch (12) is less than the outer diameter of blanking punch (13);The inner surface of recessed die plate (10) and drawing punch (12) and blanking punch (13) form waste cavity (14) for the up-down movement of lower die stripper block (11); The lower die stripper block (11) is opposite to blanking and drawing punch-die (7), and blanking and drawing punch-die (7) has first through hole (701) corresponding to product size in it, and the inner surface of blanking and drawing punch-die (7) and the outer surface of drawing punch (12) are left with product drawing space, blanking and drawing punch-die (7) moves to the outside of drawing punch (12) to draw sheet, and blanking and drawing punch-die (7) moves to the outside of blanking punch (13) to cut waste ring.

2. The high-precision stamping die for an automobile sensor housing according to claim 1, characterized in that: The upper die assembly further includes a plurality of piercing punches corresponding to the holes of the finished product, which are located inside the blanking and drawing punch-die (7) and can pass through the upper die stripper block (8), the drawing punch (12), and the blanking punch (13).

3. The high-precision stamping die for an automobile sensor housing according to claim 1, characterized in that: The size of the first through hole (701) is enlarged by 0.03mm on one side compared to the size of the outer surface of the blanking punch (13).

4. The high-precision stamping die for an automobile sensor housing according to claim 1, characterized in that: The top of the recessed die plate (10) is fixed with a positioning pin (21).

5. The high-precision stamping die for an automobile sensor housing according to claim 1, characterized in that: The upper stripper plate (6) and the upper die stripper block (8) are connected to the upper die plate through springs, and the lower die stripper block (11) is connected to the lower die plate through springs.

6. The high-precision stamping die for an automobile sensor housing according to claim 2, characterized in that: The upper die group (5) includes an upper die seat (501), an upper backing plate (502), a first upper clamping plate (503), and a second upper clamping plate (504) fixed in order from top to bottom, the second upper clamping plate (504) is provided with a second through hole (5041) for the insertion of the blanking and drawing punch-die (7), the blanking and drawing punch-die (7) extends into the second through hole (5041) and is fixed with the second upper clamping plate (504), and the first upper clamping plate (503) is provided with a plurality of third through holes (5031) for the insertion of the piercing punches, the piercing punches extend into the corresponding third through holes (5031) and are fixed with the first upper clamping plate (503).

7. The high-precision stamping die for an automobile sensor housing according to claim 6, characterized in that: The size of the first through hole (701) is enlarged by 0.02mm on one side compared to the size of the outer surface of the upper die stripper block (8), and the size of the second through hole (5041) is enlarged by 0.02mm on one side compared to the size of the outer surface of the blanking and drawing punch-die (7).

8. The high-precision stamping die for an automobile sensor housing according to claim 6, characterized in that: The outer peripheral surface of the blank drawing male and female dies (7) is provided with a protrusion (702), and the wall surface of the second through hole (5041) is provided with a limiting groove (5042) matched with the protrusion (702).

9. The high-precision stamping die for an automobile sensor housing according to claim 6, characterized in that: The lower die set (9) comprises a lower pad (901) and a lower die seat (902) fixed with each other, the female die plate (10) is fixed on the top of the lower pad (901), and the top of the lower die seat (902) is provided with a guide column (15), and the upper die seat (501) is provided with a guide sleeve (16) suitable for the insertion of the guide column (15).

10. The high-precision stamping die for an automobile sensor housing according to claim 6, characterized in that: The length of the blank drawing male and female dies (7) is greater than the length of the protruding first upper clamping plate (503) part of the punching male die.

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