Front vertical plate trimming punching die and trimming method

Abstract

The present application relates to a front vertical plate trimming punching die and a trimming method, comprising: an upper trimming die, the bottom of which is provided with an upper die trimming insert for shearing the outer contour of a workpiece, one side of which is provided with an upper die punching insert for punching the workpiece before the upper die trimming insert, and the upper die punching insert is fitted with the upper die trimming insert on one side close to the upper die trimming insert; a lower trimming punch, which is located at the bottom of the upper trimming die, the outer periphery of which is provided with a lower trimming edge matched with the upper die trimming insert, and a lower punching hole matched with the upper die punching insert, and the hole height of the lower punching hole on the side close to the lower trimming edge is lower than the height of the lower trimming edge. The die realizes a process of punching first and then trimming in a stamping process, and ensures the quality of the workpiece and the stability and reliability of stamping production, reducing the investment in adding a separate punching die.

Description

Technical Field

[0001] The present application relates to the technical field of trimming and punching dies, and in particular to a front vertical plate trimming and punching die and a trimming method. Background Art

[0002] The front vertical plate parts of light trucks are located inside the left and right sides of the front end of the light truck cab. The left and right parts are completely symmetrical and belong to the inner surface parts. The drawing depth is shallow and the surface quality requirements are not high. Figure 1 As shown, the size is 495x385x39mm. The stamping process of the front vertical plate parts is OP10-left-right symmetrical arrangement of two pieces for drawing, OP20-trimming and punching, and OP30-punching and flanging separation.

[0003] The flange shape of the front vertical plate part ( Figure 1 The trimming line after expansion (A) is bulged toward the inside of the outer contour of the workpiece, causing the waste to interfere with the trimming edge when it is separated outward. This problem is the difficulty of the stamping process of this part.

[0004] The usual solution is: Option 1, change the flange shape of the part at this location, cancel the flange of the interfering convex part, and straighten the trimming line in the direction parallel to the waste discharge, so that the trimming waste at this location can be discharged to the outside. Since the flange surface of the front vertical plate part of this model overlaps with the end surface of the front crossbeam of the body floor, the flange surface here cannot be cancelled. Therefore, Option 1 cannot be adopted.

[0005] Solution 2: Divide the raised trimming waste into a raised part ① and a waste part ②, such as Figure 2 As shown in the figure, the waste part ② generated by the trimming waste on the lower right side is cut off by the waste cutting line, trimming line and auxiliary trimming line, and then discharged along the waste outflow direction. The raised part ① is punched in the newly added op15 sequence, and the punched waste falls vertically. Since the trimming and punching here cannot be achieved on the op20 sequence die, an additional investment of an op15 sequence punching die is required, which is low in efficiency. Scheme 2 is not efficient enough, so it cannot be adopted. Summary of the invention

[0006] The embodiment of the present application provides a front vertical plate trimming punching die and a trimming method to solve the problem in the related art that the trimming line of the front vertical plate part of a light truck protrudes inside the outer contour line of the part, causing interference between the waste material and the trimming edge when it is separated outward.

[0007] A first aspect of an embodiment of the present application provides a front vertical plate trimming and punching die, comprising:

[0008] An upper trimming die, wherein an upper die trimming insert for shearing the outer contour of a workpiece is provided at the bottom of the upper trimming die, an upper die punching insert for punching holes in the workpiece before the upper die trimming insert is provided on one side of the upper die trimming insert, and a side of the upper die punching insert close to the upper die trimming insert is in contact with the upper die trimming insert;

[0009] A lower trimming punch is located at the bottom of the upper trimming die, and the outer periphery of the lower trimming punch is provided with a lower trimming cutting edge matched with the upper die trimming insert, and a lower punching hole matched with the upper die punching insert, and the hole height of the lower punching hole close to the lower trimming cutting edge is lower than the height of the lower trimming cutting edge.

[0010] In some embodiments: it also includes an upper die base located at the top of the upper trimming die, the upper trimming die is provided with two and symmetrically located on both sides of the upper die base and detachably connected to the upper die base, the upper die punching insert includes an upper insert base fixed to the bottom of the upper die base and a punching insert fixed to the bottom of the upper insert base, and the punching insert is in a "】" shaped structure.

[0011] In some embodiments: the upper trimming die is also provided with an upper die cutting insert for cutting the trimming waste, the lower trimming punch is provided with a lower die trimming cutting insert matched with the upper die cutting insert, the lower die trimming cutting insert is provided with a lower cutting edge, and the height of the lower cutting edge is lower than the lower trimming edge.

[0012] In some embodiments: the lower punch hole is a slot that runs through the upper and lower ends of the lower trimming punch and is open on one side, the lower die trimming and cutting insert is located on one side of the lower punch hole to close the slot, and the lower die trimming and cutting insert is provided with an auxiliary trimming edge whose height is lower than the lower trimming edge on the side close to the slot.

[0013] In some embodiments: it also includes a lower die seat located at the bottom of the lower trimming punch, the lower die trimming and cutting insert includes a lower insert base fixed on the top of the lower die seat and a cutting insert fixed on the top of the lower insert base, and the auxiliary trimming edge and the lower cutting edge are both located on the cutting insert.

[0014] In some embodiments: three upper die cutting inserts are provided, and the three upper die cutting inserts are respectively located at both ends and the middle of the upper trimming die.

[0015] In some embodiments: a pressing plate for pressing the workpiece is fixedly provided at the bottom of the upper die base, a nitrogen spring for elastically supporting the pressing plate is connected between the pressing plate and the upper die base, and the pressing plate presses the workpiece before the upper trimming die.

[0016] In some embodiments, the height difference between the upper die punching insert and the upper die trimming insert is 2-6 mm.

[0017] In some embodiments: a waste material sliding groove is provided at the bottom of the lower punching hole.

[0018] A second aspect of the embodiments of the present application provides a trimming method of a front vertical plate trimming and punching die, the method using the front vertical plate trimming and punching die described in any of the above embodiments, the method comprising the following steps:

[0019] Place the workpiece after drawing on the lower trimming punch, and accurately position it based on the shape of the workpiece after drawing and the lower trimming punch;

[0020] The slide of the press drives the upper die seat to move downward as a whole from the top dead center, and the pressing plate starts pressing the material after contacting the upper surface of the workpiece after drawing production;

[0021] The upper die seat and the upper trimming die continue to move downward, and the nitrogen spring between the press plate and the upper die seat is compressed to provide the pressing force of the press plate;

[0022] The upper die seat and the upper trimming die continue to move downward, and the upper die punching insert of the upper trimming die moves downward after contacting with the lower punching hole of the lower trimming punch, punching the workpiece at that position;

[0023] The upper die seat and the upper trimming die continue to move downward, the upper die trimming insert of the upper trimming die contacts the lower trimming cutting edge of the lower trimming punch, and the workpiece is sheared along the trimming line;

[0024] The upper trimming insert of the upper trimming die and the lower trimming cutting edge of the lower trimming punch overlap each other by 2-6mm to complete the trimming action. At this time, the slide of the press reaches the bottom dead center.

[0025] The slide of the press starts to return, the upper die trimming insert of the upper trimming die is disengaged from the inside of the lower trimming punch along the trimming line, and the entire upper die moves upward to the top dead center;

[0026] Remove the trimmed and punched workpiece from the lower die, and this sequence is completed.

[0027] The beneficial effects of the technical solution provided by this application include:

[0028] The embodiment of the present application provides a front vertical plate trimming and punching die and a trimming method. Since the front vertical plate trimming and punching die of the present application is provided with an upper trimming die, an upper die trimming insert for shearing the outer contour of a workpiece is provided at the bottom of the upper trimming die, and an upper die punching insert for punching the workpiece before the upper die trimming insert is provided on one side of the upper die trimming insert, and a side of the upper die punching insert close to the upper die trimming insert is in contact with the upper die trimming insert; a lower trimming punch is located at the bottom of the upper trimming die, and a lower trimming cutting edge matched with the upper die trimming insert and a lower punching hole matched with the upper die punching insert are provided on the outer periphery of the lower trimming punch, and the hole height of the lower punching hole close to the lower trimming cutting edge is lower than the height of the lower trimming cutting edge.

[0029] Therefore, when designing the trimming insert structure of the workpiece, the front vertical plate trimming and punching die of the present application will increase the height of the convex trimming edge that affects the discharge of trimming waste, and change it into an upper die punching insert, so that the workpiece can be punched first and then trimmed in one stamping process with one set of dies, and the quality of the workpiece and the stability and reliability of the stamping production are guaranteed, reducing the investment in adding a separate punching die. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of a workpiece in the background technology;

[0032] Figure 2 It is the trimming process design diagram of Scheme 2 in the background technology;

[0033] Figure 3 This is a schematic diagram of the structure of an embodiment of the present application;

[0034] Figure 4 A bottom view of the structure of the upper trimming die in the embodiment of the present application;

[0035] Figure 5 for Figure 4 The cross-sectional view along the AA direction;

[0036] Figure 6 This is a structural stereogram of the trimming die in the embodiment of the present application;

[0037] Figure 7 A top view of the structure of the lower trimming punch according to an embodiment of the present application;

[0038] Figure 8 for Figure 7 The cross-sectional view along the AA direction;

[0039] Fig. 9 This is a structural stereogram of the lower trimming punch according to an embodiment of the present application.

[0040] Reference numerals:

[0041] 1. Upper die seat; 2. Upper trimming die; 3. Pressing plate; 4. Lower trimming punch; 5. Lower die seat; 6. Down slide chute for waste; 21. Upper die trimming insert; 22. Upper die punching insert; 23. Upper die cutting insert; 24. Upper insert base; 25. Punching insert;

[0042] 51. Lower trimming edge; 52. Lower punch hole; 53. Lower die trimming and cutting insert; 54. Notch; 55. Cutting insert; 56. Lower insert base; 57. Lower cutting edge; 58. Auxiliary trimming edge. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] The embodiment of the present application provides a front vertical plate trimming punching die and a trimming method, which can solve the problem in the related art that the trimming line of the front vertical plate part of a light truck protrudes inside the outer contour line of the part, causing interference between the waste material and the trimming edge when it is separated outward.

[0045] See also Figures 3 to 8 As shown, the first aspect of the embodiment of the present application provides a front vertical plate trimming and punching die, comprising:

[0046] An upper trimming die 2 has an upper trimming insert 21 at its bottom for shearing the outer contour of a workpiece, and an upper punching insert 22 is provided on one side of the upper trimming insert 21 for punching holes in the workpiece before the upper trimming insert 21, and the upper punching insert 22 is in contact with the upper trimming insert 21 on one side thereof.

[0047] The upper die punching insert 22 protrudes from the upper die trimming insert 21 on the upper trimming die 2, the bottom surface of the upper die punching insert 22 is M, the bottom surface of the upper die trimming insert 21 is N, the bottom surface M of the upper die punching insert 22 protrudes from the bottom surface N of the upper die trimming insert 21, and a height difference H is formed between the bottom surface M of the upper die punching insert 22 and the bottom surface N of the upper die trimming insert 21, so that the upper die punching insert 22 processes the workpiece before the upper die trimming insert 21. The height difference between the upper die punching insert 22 and the upper die trimming insert 21 is 2-6mm.

[0048] The lower trimming punch 4 is located at the bottom of the upper trimming die 2. The outer periphery of the lower trimming punch 4 is provided with a lower trimming cutting edge 51 adapted to the upper die trimming insert 21, and a lower punching hole 52 adapted to the upper die punching insert 22. The hole height of the lower punching hole 52 close to the lower trimming cutting edge 51 is lower than the height of the lower trimming cutting edge 51.

[0049] The height of the hole of the lower punch hole 52 near the lower trimming edge 51 is lower than the height of the lower trimming edge 51, the top surface of the lower trimming edge 51 is S, the top surface of the hole of the lower punch hole 52 near the lower trimming edge 51 is T, and the top surface S of the lower trimming edge 51 protrudes from the top surface T of the hole of the lower punch hole 52 near the lower trimming edge 51. The top surface S of the lower trimming edge 51 and the top surface T of the hole of the lower punch hole 52 near the lower trimming edge 51 form a height difference h, so as to prevent the hole of the lower punch hole 52 near the lower trimming edge 51 from interfering with the shearing of the workpiece by the lower trimming edge 51.

[0050] The front vertical plate trimming and punching die of the embodiment of the present application increases the height of the convex trimming edge that affects the discharge of trimming waste materials when designing the trimming insert structure of the workpiece, and changes it into an upper die punching insert 22, so that the workpiece can be punched first and then trimmed in one stamping process with one set of dies, and the quality of the workpiece and the stability and reliability of the stamping production are guaranteed, reducing the investment in adding a separate punching die.

[0051] In some alternative embodiments: See Figure 3 and Figure 6 As shown, the embodiment of the present application provides a front vertical plate trimming punching die, which also includes an upper die base 1 located at the top of an upper trimming die 2, and the upper trimming die 2 is provided with two symmetrically located on both sides of the upper die base 1 and detachably connected to the upper die base 1. The upper die punching insert 22 includes an upper insert base 24 fixed to the bottom of the upper die base 1 and a punching insert 25 fixed to the bottom of the upper insert base 24, and the punching insert 25 is in a "】"-shaped structure.

[0052] The upper die punching insert 22 and the upper die trimming insert 21 adopt a split structure. The upper die punching insert 22 and the upper die trimming insert 21 are both detachably connected to the upper die base 1, and the upper die trimming insert 21 can be designed as a segmented structure with two front and rear sections, which is convenient for the processing and manufacturing of the upper die punching insert 22 and the upper die trimming insert 21, and improves the structural strength, which is convenient for later maintenance and replacement, so as to reduce the cost of use and maintenance.

[0053] In some alternative embodiments: See Figure 6 , Figure 7 , Fig. 9 As shown, an embodiment of the present application provides a front vertical plate trimming and punching die, the upper trimming die 2 of the die is also provided with an upper die cutting insert 23 for cutting the trimming waste, the lower trimming punch 4 is provided with a lower die trimming and cutting insert 53 matched with the upper die cutting insert 23, the lower die trimming and cutting insert 53 is provided with a lower cutting edge 57, and the height of the lower cutting edge 57 is lower than the lower trimming edge 51.

[0054] In the embodiment of the present application, an upper die cutting insert 23 for cutting off trimming waste is further provided on the upper trimming die 2, and a lower die trimming cutting insert 53 matching the upper die cutting insert 23 is provided on the lower trimming punch 4. Three upper die cutting inserts 23 are provided, and the three upper die cutting inserts 23 are respectively located at the two ends and the middle of the upper trimming die 2. The upper die cutting insert 23 and the lower die trimming cutting insert 53 cooperate with each other to cut off the trimming waste, so that the trimming waste is separated from the workpiece and discharged outward by itself.

[0055] In some alternative embodiments: See Figure 3 and Fig. 9 As shown, an embodiment of the present application provides a front vertical plate trimming and punching die, the lower punching hole 52 of the die is a slot 54 that passes through the upper and lower ends of the lower trimming punch 4 and is open on one side, the lower die trimming and cutting insert 53 is located on one side of the lower punching hole 52 to close the slot 54, and the side of the lower die trimming and cutting insert 53 close to the slot 54 is provided with an auxiliary trimming edge 58 whose height is lower than the lower trimming edge 51.

[0056] It also includes a lower die seat 5 located at the bottom of the lower trimming punch 4, a lower die trimming and cutting insert 53 includes a lower insert base 56 fixed on the top of the lower die seat 5 and a cutting insert 55 fixed on the top of the lower insert base 56, and an auxiliary trimming edge 58 and a lower cutting edge 57 are both located on the cutting insert 55. The auxiliary trimming edge 58 and the notch 54 cooperate with each other to form a lower punching hole 52 that is closed all around. When the upper die punching insert 22 is pressed down into the lower punching hole 52, the auxiliary trimming edge 58 and the notch 54 cooperate with the upper die punching insert 22 to perform a punching operation on the workpiece.

[0057] A pressing plate 3 for pressing the workpiece is fixedly provided at the bottom of the upper die base 1. A nitrogen spring for elastically supporting the pressing plate 3 is connected between the pressing plate 3 and the upper die base 1. The pressing plate 3 presses the workpiece before the upper trimming die 2 to press and fix the workpiece on the lower trimming die 4. A waste lower slide groove 6 is provided at the bottom of the lower punch hole 52. The waste punched out of the lower punch hole 52 falls into the waste lower slide groove 6 and then slides into the waste collection box.

[0058] See also Figures 3 to 9 As shown, the second aspect of the embodiment of the present application provides a trimming method of a front vertical plate trimming punching die, the method using the front vertical plate trimming punching die described in any of the above embodiments, the method comprising the following steps:

[0059] Step 1: Place the workpiece after drawing production on the lower trimming punch 4, and accurately position the workpiece and the lower trimming punch 4 based on the shape of the workpiece after drawing production.

[0060] Step 2: The slide block of the press drives the upper die base 1 to move downward as a whole from the upper dead center, and the pressing plate 3 contacts the upper surface of the workpiece after drawing production and starts pressing.

[0061] Step 3: The upper die holder 1 and the upper trimming die 2 continue to move downward, and the nitrogen spring between the pressing plate 3 and the upper die holder 1 is compressed to provide a pressing force for the pressing plate 3 .

[0062] Step 4, the upper die base 1 and the upper trimming die 2 continue to descend, and the upper die punching insert 22 of the upper trimming die 2 and the lower punching hole 52 of the lower trimming punch 4 contact and then descend to punch the workpiece at that position.

[0063] Step 5: The upper die holder 1 and the upper trimming die 2 continue to move downward, the upper die trimming insert 21 of the upper trimming die 2 contacts the lower trimming cutting edge 51 of the lower trimming punch 4, and the workpiece is sheared along the trimming line.

[0064] Step 6: The upper trimming insert 21 of the upper trimming die 2 and the lower trimming cutting edge 51 of the lower trimming punch 4 overlap each other by a height of 2-6 mm to complete the trimming action. At this time, the press slide reaches the bottom dead center.

[0065] Step 7, the press slide starts to return, the upper die trimming insert 21 of the upper trimming die 2 is disengaged from the lower trimming punch 4 along the trimming line, and the entire upper die moves upward to the top dead center.

[0066] Step 8: Remove the trimmed and punched workpiece from the lower die, and this sequence is completed.

[0067] How it works

[0068] The embodiment of the present application provides a front vertical plate trimming punching die and a trimming method. Since the front vertical plate trimming punching die of the present application is provided with an upper trimming die 2, an upper die trimming insert 21 for shearing the outer contour of a workpiece is provided at the bottom of the upper trimming die 2, and an upper die punching insert 22 for punching the workpiece before the upper die trimming insert 21 is provided on one side of the upper die trimming insert 21, and the upper die punching insert 22 is in contact with the upper die trimming insert 21 on one side close to the upper die trimming insert 21; a lower trimming punch 4 is located at the bottom of the upper trimming die 2, and a lower trimming cutting edge 51 adapted to the upper die trimming insert 21 and a lower punching hole 52 adapted to the upper die punching insert 22 are provided on the outer periphery of the lower trimming punch 4, and the hole height of the lower punching hole 52 on the side close to the lower trimming cutting edge 51 is lower than the height of the lower trimming cutting edge 51.

[0069] Therefore, when designing the trimming insert structure of the workpiece, the front vertical plate trimming and punching die of the present application will increase the height of the convex trimming edge that affects the discharge of the trimming waste, and change it into an upper die punching insert 22, so that the workpiece can be punched first and then trimmed in one stamping process with one set of dies here, and the quality of the workpiece and the stability and reliability of the stamping production are guaranteed, reducing the investment in adding a separate punching die.

[0070] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0071] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0072] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A front vertical plate trimming and punching die, characterized in that: include: An upper trimming die (2), wherein an upper die trimming insert (21) for shearing the outer contour of a workpiece is provided at the bottom of the upper trimming die (2), an upper die punching insert (22) for punching holes in the workpiece before the upper die trimming insert (21) is provided on one side of the upper die trimming insert (21), and a side of the upper die punching insert (22) close to the upper die trimming insert (21) is in contact with the upper die trimming insert (21); A lower trimming punch (4), the lower trimming punch (4) being located at the bottom of the upper trimming die (2), the outer periphery of the lower trimming punch (4) being provided with a lower trimming cutting edge (51) adapted to the upper die trimming insert (21), and a lower punching hole (52) adapted to the upper die punching insert (22), the hole height of the lower punching hole (52) close to the lower trimming cutting edge (51) being lower than the height of the lower trimming cutting edge (51); The upper trimming die (2) is also provided with an upper die cutting insert (23) for cutting trimming waste, the lower trimming punch (4) is provided with a lower die trimming cutting insert (53) matched with the upper die cutting insert (23), the lower die trimming cutting insert (53) is provided with a lower cutting edge (57), and the height of the lower cutting edge (57) is lower than the lower trimming edge (51); The lower punch hole (52) is a notch (54) that runs through the upper and lower ends of the lower trimming punch (4) and is open on one side. The lower die trimming and cutting insert (53) is located on one side of the lower punch hole (52) to close the notch (54). An auxiliary trimming edge (58) whose height is lower than that of the lower trimming edge (51) is provided on one side of the lower die trimming and cutting insert (53) close to the notch (54).

2. A front vertical plate trimming and punching die as claimed in claim 1, characterized in that: It also comprises an upper die seat (1) located at the top of the upper trimming die (2), the upper trimming die (2) being provided with two symmetrically located on both sides of the upper die seat (1) and detachably connected to the upper die seat (1), the upper die punching insert (22) comprising an upper insert base (24) fixed to the bottom of the upper die seat (1) and a punching insert (25) fixed to the bottom of the upper insert base (24), the punching insert (25) being in a "】"-shaped structure.

3. A front vertical plate trimming and punching die as claimed in claim 1, characterized in that: It also includes a lower die seat (5) located at the bottom of the lower trimming punch (4), the lower die trimming and cutting insert (53) includes a lower insert base (56) fixed to the top of the lower die seat (5) and a cutting insert (55) fixed to the top of the lower insert base (56), and the auxiliary trimming edge (58) and the lower cutting edge (57) are both located on the cutting insert (55).

4. A front vertical plate trimming and punching die as claimed in claim 1, characterized in that: There are three upper die cutting inserts (23), and the three upper die cutting inserts (23) are respectively located at the two ends and the middle of the upper trimming die (2).

5. A front vertical plate trimming and punching die as claimed in claim 2, characterized in that: A pressing plate (3) for pressing the workpiece is also fixedly provided at the bottom of the upper die seat (1), and a nitrogen spring for elastically supporting the pressing plate (3) is connected between the pressing plate (3) and the upper die seat (1). The pressing plate (3) presses the workpiece before the upper trimming die (2).

6. The front vertical plate trimming and punching die according to claim 1, characterized in that: The height difference between the upper die punching insert (22) and the upper die trimming insert (21) is 2-6 mm.

7. The front vertical plate trimming and punching die according to claim 1, characterized in that: A waste material lower slide groove (6) is provided at the bottom of the lower punching hole (52).

8. A trimming method for a front vertical plate trimming punching die, characterized in that: The method uses the front vertical plate trimming and punching die according to any one of claims 1 to 7, and the method comprises the following steps: Placing the workpiece after drawing production on the lower trimming punch (4), and accurately positioning the workpiece after drawing production and the lower trimming punch (4); The slide block of the press machine drives the upper die seat (1) to move downward as a whole from the upper dead point, and the pressing plate (3) starts pressing the material after contacting the upper surface of the workpiece after the drawing production; The upper die seat (1) and the upper trimming die (2) continue to move downward, and the nitrogen spring between the pressing plate (3) and the upper die seat (1) is compressed to provide a pressing force for the pressing plate; The upper die seat (1) and the upper trimming die (2) continue to move downward, and the upper die punching insert (22) of the upper trimming die (2) and the lower punching hole (52) of the lower trimming punch (4) contact each other and then move downward to punch the workpiece at that position; The upper die seat (1) and the upper trimming die (2) continue to move downward, and the upper die trimming insert (21) of the upper trimming die (2) contacts the lower trimming cutting edge (51) of the lower trimming punch (4), thereby shearing the workpiece along the trimming line; The upper trimming insert (21) of the upper trimming die (2) and the lower trimming cutting edge (51) of the lower trimming punch (4) overlap each other by a height of 2-6 mm to complete the trimming action, and at this time, the slide of the press reaches the bottom dead center; The slide of the press starts to return, the upper die trimming insert (21) of the upper trimming die (2) is disengaged from the inside of the lower trimming punch (4) along the trimming line, and the entire upper die moves upward to the upper dead point; Remove the trimmed and punched workpiece from the lower die, and this sequence is completed.

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