Stamping die and machining method thereof

Abstract

The invention provides a stamping die and a processing method thereof, the stamping die comprises a male die (1) and a female die which are used for forming a plate, a forming surface (2) of the male die (1) is provided with a plurality of forming areas (3), a groove (4) is formed in at least one forming area (3), and the groove (4) is provided with a dirt discharge hole (5) which is through along the thickness direction of the male die (1). According to the stamping die, foreign matter and oil dirt accumulated in the groove of the male die in the production process can be discharged in time through the dirt discharging hole.

Description

TECHNICAL FIELD

[0001] The present application relates to a press die and a processing method thereof. BACKGROUND

[0002] Generally, the outer panel parts of an automobile body have a relatively large outer panel surface, and the shape on the outer panel surface is formed by press molding using a press die. Before the press molding, a coil material is cut into a square-shaped panel, and small foreign matter and oil dirt adhere to the panel due to the external environment, and also, micro foreign matter is generated due to the equipment or die of a production plant during the production process. The small foreign matter, oil dirt, and micro foreign matter fall on the molding surface of the die due to the operation of the press equipment and die during the production process, and thus, the panel is damaged to have a bulge or a dent, and the damaged panel increases the manufacturing cost at the time of rework, and the production line needs to be frequently stopped for the cleaning of the die, which results in a low production efficiency.

[0003] In Patent Document 1, a press die is disclosed in which a plurality of grooves are formed on at least any one of the molding surfaces of a punch and a die, and the press damage or the protrusion of the panel due to the foreign matter or the oil is prevented by allowing the foreign matter or the oil to fall into the grooves.

[0004] However, in the press die of Patent Document 1, when the foreign matter and the oil are simultaneously accumulated in the grid-shaped grooves, the foreign matter comes into contact with the molding surface of the panel or the punch when the amount of the accumulation is large and cannot be discharged, and thus, the press damage occurs, and the production line needs to be stopped for the cleaning of the die.

[0005] PRIOR ART DOCUMENT

[0006] Patent Document 1: JP 4604552 B2 SUMMARY

[0007] The present application has an object to provide a press die and a processing method thereof, which can promptly discharge the foreign matter and the oil dirt accumulated in the grooves of the punch during the production process through the drain hole.

[0008] (1) In order to achieve the above object, the present application provides a press die including a punch and a die for the molding of a panel, and the molding surface of the punch has at least one molding area, characterized in that,

[0009] a groove is formed in the at least one molding area, and a drain hole is provided in the groove to penetrate in the thickness direction of the punch.

[0010] By adopting the above structure, the foreign matter and the oil dirt on the panel during the production process can be accommodated in the groove of the molding area, and the foreign matter and the oil dirt accumulated in the groove can be discharged to the outside of the die through the drain hole, and thus, the press damage of the panel can be prevented, and the time for cleaning the press die can be reduced.

[0011] (2) On the basis of the above structure, the grooves include first grooves extending along a first direction and arranged at intervals along a second direction, and second grooves extending along the second direction and arranged at intervals along the first direction, the first direction and the second direction intersecting each other, and the plurality of first grooves and the plurality of second grooves intersect each other to form a grid-shaped region.

[0012] By adopting the above structure, the grooves intersecting each other in different directions form a grid shape, and oil stains and foreign matters in any direction can enter the grid, thereby smoothly entering the drain hole, and it is more conducive to accommodating foreign matters and oil stains generated in the production process.

[0013] (3) On the basis of the above structure, the plurality of first grooves and the plurality of second grooves intersect each other to form a plurality of intersection parts, and the drain hole is arranged at the intersection part.

[0014] By adopting the above structure, the drain hole is arranged at the intersection part of the grooves, and oil stains and foreign matters from the plurality of grooves can smoothly enter the drain hole, which is more conducive to drainage, and at the same time, the strength of the forming surface of the male die can be ensured.

[0015] (4) On the basis of the above structure, a plurality of drain holes are arranged, and at least one drain hole is located at the lowest end of the grid-shaped region.

[0016] By adopting the above structure, even if a large amount of foreign matters and oil stains generated in the production process accumulate in the grid-shaped grooves, as the foreign matters and oil stains flow downward along the arc-shaped slope of the die forming surface, the foreign matters and oil stains can be timely discharged to the outside of the stamping die through the drain hole located at the lowest end of the grid-shaped region, thereby preventing the sheet from being damaged and reducing the time for cleaning the stamping die.

[0017] (5) On the basis of the above structure, a plurality of die plate ribs arranged at intervals are arranged at the bottom of the male die opposite to the forming surface, and the distance from the drain hole to any one die plate rib is greater than a set threshold value.

[0018] (6) On the basis of the above structure, the distance from the drain hole to any one die plate rib is greater than 25 mm.

[0019] By adopting the above structure, it can prevent the strength of the stamping die from being reduced due to the small distance between the drain hole and the die plate rib, and it can prevent the machining tool from interfering with the die plate rib during machining of the drain hole, thereby preventing damage to the machining tool and the stamping die.

[0020] (7) On the basis of the above structure, the drain hole includes a first hole part, a second hole part, and a tapered part connecting the first hole part and the second hole part, the first hole part and the second hole part communicate with each other through the tapered part, and the hole diameter of the first hole part is smaller than the hole diameter of the second hole part.

[0021] By adopting the above structure, by setting the first hole part as narrow diameter, the strength of the overall forming surface of the stamping die can be ensured, by setting the second hole part as wide diameter, the foreign matter and oil stains can be smoothly discharged to the outside of the stamping die, and the tapered part can guide the oil stains and foreign matter flowing into the first hole part to the second hole part, facilitating smooth discharge.

[0022] (8) On the basis of the above structure, the opening of the first hole part and the groove at the opening edge are located in the same plane, and the second hole part is located below the first hole part.

[0023] By adopting the above structure, the first hole part is located on the forming surface of the punch as an important stress part during the die stamping process, by being set in the same plane with the groove at the opening edge, the oil stains and foreign matter can be smoothly entered into the first hole part. The second hole part is located below the first hole part, and the first hole part is located near the forming area. In order to ensure the strength of the forming area, the first hole part is set as narrow diameter, and the second hole part is located at the bottom of the stamping die which belongs to the general part of the stamping die. By setting as wide diameter, the foreign matter and oil stains can be smoothly discharged to the outside of the stamping die.

[0024] (9) On the basis of the above structure, the first hole part is provided with an inverted tapered shape with a diameter that decreases from the opening to the side of the second hole part.

[0025] By adopting the above structure, the oil stains and foreign matter in the groove can be guided to smoothly enter the first hole part, thereby being discharged outward, which is more conducive to timely discharge of foreign matter and oil stains and avoids accumulation of foreign matter and oil stains at the opening of the first hole part.

[0026] (10) On the basis of the above structure, the drain hole is provided with a plurality of drain holes, and the plurality of drain holes are arranged at a certain distance along the first direction and / or the second direction.

[0027] (11) On the basis of the above structure, the spacing range of any two drain holes in the first direction and / or the second direction is 100mm-600mm.

[0028] By adopting the above structure, the number, layout method and processing method of the drain hole can be determined based on the shape of the stamping die forming surface of different outer plate parts. By providing a plurality of drain holes, it can prevent the foreign matter and oil stains from not being completely discharged when the number of drain holes is too small.

[0029] (12) On the basis of the above structure, a first drain hole is arranged at the intersection at the lowest end of the grid-shaped area, and a certain number of drain holes are arranged at a certain distance along the first direction and / or the second direction starting from the first drain hole.

[0030] By adopting the above structure, the layout mode of the drain hole can be determined based on the change of the forming surface shape of the stamping die of different outer plate parts, and the foreign matter and oil stains in the grid-shaped groove at the high point forming surface can gradually move downward toward the lowest end under the action of gravity during the production process. The drain hole during the movement process can discharge all or part of the foreign matter and oil stains. Even if the foreign matter and oil stains are not completely discharged during the downward movement process, they can be finally discharged through the drain hole at the lowest end, thereby avoiding a large amount of accumulation.

[0031] (13) On the basis of the above structure, the number of drain holes in the first direction is more than that in the second direction.

[0032] (14) On the basis of the above structure, the first direction is the transverse direction of the grid-shaped area, and the second direction is the longitudinal direction of the grid-shaped area.

[0033] (15) On the basis of the above structure, the plurality of drain holes are first arranged at intervals along the transverse direction and then arranged at intervals along the longitudinal direction.

[0034] By adopting the above structure, the number of drain holes in the transverse direction is more than that in the longitudinal direction, that is, the drain holes are preferentially arranged in the transverse direction, and the drain holes are first arranged in the transverse direction at a low height, so that the number of transverse drain holes is ensured. In the case that the forming surface of a general die is an arc shape with curvature, it is more beneficial to discharge the foreign matter and oil stains accumulated or overflowed on the forming surface to the outside of the die.

[0035] (16) The present application provides a processing method of a stamping die, which is the processing method of any one of the stamping dies in (1) to (15) above. The drain hole comprises a first hole part, a second hole part, and a tapered part connecting the first hole part and the second hole part. The first hole part and the second hole part are in communication with each other through the tapered part, and the hole diameter of the first hole part is smaller than the hole diameter of the second hole part.

[0036] The processing method comprises the following steps:

[0037] Obtaining the coordinates of each drain hole on the forming area, and based on the coordinates, processing data of the second hole part and the tapered part of each drain hole are made;

[0038] Based on the processing data of the second hole part and the tapered part, the second hole part and the tapered part are processed from the bottom side of the punch;

[0039] Based on the coordinates, processing data of the pre-guide hole of the first hole part of each drain hole are made;

[0040] Based on the processing data of the pre-guide hole of the first hole part, the pre-guide hole of the first hole part is processed from the forming surface side of the punch at a set processing depth; and

[0041] The machining of the machining track of the pre-guide hole of the first hole portion is continued until the first hole portion is machined in communication with the second hole portion.

[0042] (17) On the basis of the above method, coordinates of each pollution discharge hole on the forming area are obtained, including: reflecting the predetermined positions of all pollution discharge holes on the punch to the 3D model of the stamping die; marking the coordinates of all pollution discharge holes on the 3D model; measuring the distance from the coordinates of all pollution discharge holes in the 3D model to the nearest die plate rib; and if the distance is less than the minimum threshold, adjusting the predetermined position of the corresponding pollution discharge hole until the distance is greater than the minimum threshold, updating the coordinates of the pollution discharge hole on the 3D model, and finally obtaining the coordinates of all pollution discharge holes.

[0043] By adopting the above method, the number, layout mode and machining of the pollution discharge hole can be determined based on the condition of the stamping die itself, ensuring that the foreign matter and oil stains accumulated in the grid-shaped grooves of the punch can be discharged in time when a large amount of foreign matter and oil stains are accumulated in the grid-shaped grooves of the punch during production, ensuring that the production line can continue to run, and improving the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a drawing showing the overall shape of the punch of the stamping die of the present application, (a) is a top view, and (b) is a bottom perspective view.

[0045] Figure 2 is a top view showing one forming area in the forming surface of the punch of the stamping die of the present application.

[0046] Figure 3 is a sectional view showing an example of the pollution discharge hole of the punch of the stamping die of the present application.

[0047] Figure 4 is a sectional view showing another example of the pollution discharge hole of the punch of the stamping die of the present application.

[0048] Figure 5 is a drawing illustrating the layout of the pollution discharge hole of the punch of the stamping die of the present application.

[0049] Figure 6 is a step diagram showing the machining method of the pollution discharge hole of the punch of the stamping die of the present application.

[0050] REFERENCE SIGNS

[0051] 1, punch; 2, forming surface; 3, forming area; 4, groove; 5, pollution discharge hole; 5a, first hole portion; 5aa, pre-guide hole; 5b, second hole portion; 5c, tapered portion; 6, die plate rib; a, b, distance from the pollution discharge hole to the die plate rib. DETAILED DESCRIPTION

[0052] Hereinafter, the specific embodiments of the present application will be described in detail with reference to the drawings.

[0053] For the sake of convenience of explanation, the same reference numerals are used for corresponding parts in each drawing, and further explanation is omitted for repeated parts. In addition, in the following explanation, expressions such as "upper" and "lower" are used to indicate orientation, which are defined with the molding surface of the punch of the press die as the upper side.

[0054] <Overall structure>

[0055] Figure 1 is a view showing the overall shape of the punch of the press die of the present application, (a) is a plan view, and (b) is a bottom perspective view.

[0056] As shown in Figure 1 , a molding area 3 is formed on the molding surface 2 of the punch 1, and the molding area 3 can be multiple in size and shape. A groove 4 is formed in at least one of the molding areas 3, and a drain hole 5 is provided in the groove 4, which penetrates through the thickness direction of the punch 1.

[0057] By providing the groove 4 in the molding area 3 and the drain hole 5 in the groove 4, the groove 4 can be used to accommodate foreign matter and oil stains on the plate during production, and the foreign matter and oil stains accumulated in the groove 4 can be drained out of the mold through the drain hole, thereby preventing the plate from being crushed and reducing the time for cleaning the mold.

[0058] As shown in Figure 1 , Figure 2 , the groove 4 includes a first groove extending in a first direction and arranged in a second direction, and a second groove extending in the second direction and arranged in the first direction. The first direction and the second direction intersect, and the plurality of first grooves and the plurality of second grooves intersect each other to form a grid-shaped area. The included angle formed by the above intersection is not necessarily 90°, but can also be 60°.

[0059] By providing the groove 4 as described above, the grooves intersecting in different directions form a grid shape, and oil stains and foreign matter in any direction can enter the grid, thereby smoothly entering the drain hole, which is more conducive to accommodating foreign matter and oil stains generated during production.

[0060] In addition, as shown in Figure 2 , the plurality of first grooves and the plurality of second grooves intersect each other to form a plurality of intersection portions, and the drain hole 5 is provided in the intersection portion.

[0061] In this way, by providing the drain hole 5 at the intersection portion of the groove, oil stains and foreign matter from multiple grooves can smoothly enter the drain hole, which is more conducive to drainage, while the strength of the molding surface of the punch can be ensured.

[0062] In addition, multiple drain holes 5 are provided, with at least one drain hole 5 located at the lowest end of the grid-like area. In this way, even if a large amount of foreign matter and oil accumulates in the grid-like grooves during the production process, as the foreign matter and oil flow down the arc-shaped slope of the mold forming surface, they can be promptly discharged to a place outside the stamping mold through the drain hole located at the lowest end of the grid-like area. This can prevent the sheet metal from being damaged and reduce the time required to clean the mold.

[0063] like Figure 1 As shown in (b), a plurality of die ribs 6 are provided at the bottom of the punch 1 on the side opposite to the forming surface 2. The plurality of die ribs 6 are arranged longitudinally and transversely at certain intervals to support the stamping die.

[0064] like Figure 1 As shown in (b), the distances a and b from the drain hole 5 to any mold plate rib 6 are greater than a set threshold, preferably, a and b are both greater than 25 mm.

[0065] By setting the distance between the drain hole 5 and the mold plate rib 6 as described above, the strength of the stamping die can be prevented from decreasing due to the small distance between the drain hole and the mold plate rib. It can also prevent the machining tool from interfering with the mold plate rib during the machining of the drain hole, which could lead to damage to the machining tool and the stamping die.

[0066] like Figure 3 As shown, the drain hole 5 is generally convex in shape, narrower at the top and wider at the bottom, and includes a narrow diameter portion (first hole portion) 5a, a wide diameter portion (second hole portion) 5b, and a tapered portion 5c connecting the narrow diameter portion 5a and the wide diameter portion 5b. The narrow diameter portion 5a and the wide diameter portion 5b are interconnected via the tapered portion 5c, and the diameter of the hole in the narrow diameter portion 5a is smaller than the diameter of the hole in the wide diameter portion 5b. The opening of the narrow diameter portion 5a and the groove 4 of the punch 1 at the edge of the opening are located on the same plane. The wide diameter portion 5b is located below the narrow diameter portion 5a.

[0067] By setting the drain hole 5 to the shape described above, the narrow diameter portion is located on the forming surface 2 of the punch 1, which is an important stress-bearing part in the stamping process of the stamping die. By setting it to be on the same plane as the groove at the edge of the opening, it is convenient for oil and foreign objects in the groove to smoothly enter the narrow diameter portion 5a. The wide diameter portion is located below the narrow diameter portion, and the narrow diameter portion 5a is located close to the forming surface 2. In order to ensure the strength of the forming surface, the first hole portion is set to be narrow diameter. The second hole portion is located at the bottom of the stamping die, which is a general part of the stamping die. By setting it to be wide diameter, it is convenient for foreign objects and oil to be smoothly discharged to the outside of the stamping die.

[0068] like Figure 4 As shown, the narrow diameter portion 5a may also be provided with an inverted cone shape that narrows as it moves from the opening toward the wide diameter portion 5b. That is, the inner diameter of the narrow diameter portion 5a is smaller than the outer diameter, and the outer diameter is formed as a step that gradually decreases from top to bottom.

[0069] By the above arrangement, the oil stains and foreign matters in the groove can be smoothly guided into the narrow diameter portion to be discharged outward, so that the foreign matters and oil stains can be more timely discharged, and the accumulation of the foreign matters and oil stains at the opening of the narrow diameter portion can be avoided.

[0070] <Layout of the drain hole>

[0071] The drain holes 5 can be provided in plurality. The plurality of drain holes 5 are provided at intervals along a first direction (i.e., a lateral direction of the grid-shaped region) and / or a second direction (i.e., a longitudinal direction of the grid-shaped region) in which the intersections of the grooves 4 are arranged, the first direction and the second direction being perpendicular to each other.

[0072] The interval of any two drain holes 5 in the first direction and / or the second direction is in a range of 100 mm to 600 mm.

[0073] Specifically, as shown in (a) and (b) of FIG. 6, a first drain hole is provided at the intersection of the groove 4 located at the lowest end of the grid-shaped region of the forming region 3, and as shown in (c) and (d) of FIG. 6, a predetermined number of drain holes are provided at intervals along the first direction or the second direction in which the intersections of the grooves 4 are arranged, starting from the first drain hole. Figure 5 Figure 5 It should be noted that, when the drain holes 5 are processed, the drain holes 5 are first provided at intervals along the first direction until the drain holes 5 in the first direction are provided in the required number, and then the drain holes 5 are provided at intervals along the second direction until the drain holes 5 in the second direction are provided in the required number, the number of the drain holes 5 in the first direction being equal to or greater than the number of the drain holes 5 in the second direction.

[0074] It should be noted that, when the drain holes 5 are processed, the drain holes 5 are first provided at intervals along the first direction until the drain holes 5 in the first direction are provided in the required number, and then the drain holes 5 are provided at intervals along the second direction until the drain holes 5 in the second direction are provided in the required number, the number of the drain holes 5 in the first direction being equal to or greater than the number of the drain holes 5 in the second direction.

[0075] Alternatively, the drain holes can include a plurality of rows of hole columns in the first direction, and the drain holes are first provided at intervals from the first drain hole at the lowest end of the grid-shaped region to form a first hole column in the first direction, and then a first drain hole of a second hole column is formed at intervals in the second direction, and then the drain holes are provided at intervals in the first direction to form a second hole column in the first direction, and so on, until a predetermined number of drain holes are provided.

[0076] In this way, the drain holes are first provided along the first direction, i.e., the lateral direction of the grid-shaped region, and in the case where the forming surface of a general mold is arc-shaped with curvature, the number of the drain holes located at the lateral position of the lower end is ensured, which is more conducive to discharging the foreign matters and oil stains accumulated or overflowing on the forming surface to the outside of the mold.

[0077] <Processing of the drain hole>

[0078] ​First, coordinates of the plurality of drain holes 5 on the molding area are obtained. Specifically, the predetermined positions of all the drain holes 5 on the punch 1 are reflected to a 3D model of the stamping die, coordinates of all the drain holes 5 on the 3D model are marked, distances from the marked coordinates of all the drain holes 5 on the 3D model to the nearest die plate rib 6 are measured, if the distance is less than a minimum threshold, the predetermined position of the corresponding drain hole is adjusted until the distance is greater than the minimum threshold, the coordinates of the drain hole on the 3D model are updated, and finally the coordinates of all the drain holes are obtained.

[0079] The coordinates of each drain hole 5 on the molding area are obtained (refer to (a) of Figure 6 , and machining data of the wide-diameter portion 5b and the tapered portion 5c of each drain hole 5 are created based on the coordinates, the wide-diameter portion 5b and the tapered portion 5c are machined from the bottom side of the punch 1 based on the machining data of the wide-diameter portion 5b and the tapered portion 5c (refer to (b) of Figure 6 ).

[0080] The coordinates of each drain hole 5 on the molding area are obtained (refer to (a) of Figure 6 , and the coordinates of the pre-guide hole 5aa of the narrow-diameter portion 5a and the machining depth of the pre-guide hole 5aa are set, and further machining data of the pre-guide hole 5aa of the narrow-diameter portion 5a are created, the pre-guide hole 5aa of the narrow-diameter portion 5a is machined from the molding area side of the punch 1 at the set machining depth (refer to (c) of Figure 6 ), and further, machining is continued based on the machining track of the pre-guide hole 5aa of the narrow-diameter portion 5a until the narrow-diameter portion 5a is machined in communication with the wide-diameter portion 5b (refer to (d) of Figure 6 ).

[0081] Embodiment

[0082] The present embodiment relates to a stamping die, the punch of which cooperates with the concave die to stamp and form a plate by cooperating with a stamping equipment. The punch of the stamping die has a molding area which cooperates with the concave die, and the contact surface which contacts the plate according to the shape and structure of the plate for the need of plate forming. The main improvement point of the present embodiment is that the molding area is provided with a groove which can accommodate foreign matters, oil stains and the like in the stamping process, and the groove is provided with a drain hole, so that the foreign matters and oil stains accommodated in the stamping process can be discharged through the drain hole, thereby improving the surface quality of the plate.

[0083] In the present embodiment, the stamping die can be the outer panel of the engine cover, the roof, the outer panel of the door, the outer panel of the side wall, the fender and the like of the automobile body which have a large surface area. In the stamping and forming process, zinc powder, dust, oil stains and the like are easily adhered to the surface of the molding area, and concave and convex pits are generated on the surface of the stamped and formed plate, which affects the surface quality of the plate.

[0084] Based on the above description, the punch of the present embodiment includes a punch and a die for forming a plate member. As shown in Figure 1 the punch for a roof of a vehicle body, a plurality of forming regions 3 are provided on almost the entire forming surface 2 of the punch 1. In each of the plurality of forming regions 3, a plurality of grooves 4 are formed, the plurality of grooves 4 include a plurality of first grooves extending in a first direction and arranged at intervals in a second direction, and a plurality of second grooves extending in the second direction and arranged at intervals in the first direction, the first direction and the second direction are perpendicular to each other, and the plurality of first grooves and the plurality of second grooves cross each other to form a grid-shaped region. The first direction is a transverse direction of the grid-shaped region, and the second direction is a longitudinal direction of the grid-shaped region.

[0085] In each of the plurality of forming regions 3, the plurality of first grooves and the plurality of second grooves cross each other to form a plurality of intersection portions, and a plurality of blowholes 5 extending through the thickness direction of the punch 1 are arranged at intervals in the first direction and the second direction of the intersection portions of the grooves 4. Specifically, a first blowhole is arranged at the intersection portion of the grooves 4 at the lowest end of the grid-shaped region of each of the forming regions 3, and a predetermined number of blowholes are arranged at intervals along the first direction or the second direction of the intersection portions of the grooves 4 from the first blowhole. Arrangement method 1: the interval between any two blowholes 5 in the first direction and the second direction is 100 mm. More specifically, taking one of the forming regions 3 as an example, when the area of the grid-shaped region is 1050 mm x 1800 mm, the diameter φ of each blowhole 5 is 1.5 mm, blowholes 5 are arranged at intervals of 100 mm in the first direction, a total of 9 blowholes 5 are arranged, and blowholes 5 are arranged at intervals of 100 mm in the second direction, a total of 8 blowholes 5 are arranged, and a total of 72 blowholes 5 are arranged. Arrangement method 2: the interval between any two blowholes 5 in the first direction and the second direction is 300 mm. More specifically, taking one of the forming regions 3 as an example, when the area of the grid-shaped region is 1050 mm x 1800 mm, the diameter φ of each blowhole 5 is 1.5 mm, blowholes 5 are arranged at intervals of 300 mm in the first direction, a total of 6 blowholes 5 are arranged, and blowholes 5 are arranged at intervals of 300 mm in the second direction, a total of 4 blowholes 5 are arranged, and a total of 24 blowholes 5 are arranged. Arrangement method 3: the interval between any two blowholes 5 in the first direction and the second direction is 600 mm. More specifically, taking one of the forming regions 3 as an example, when the area of the grid-shaped region is 1050 mm x 1800 mm, the diameter φ of each blowhole 5 is 1.5 mm, blowholes 5 are arranged at intervals of 600 mm in the first direction, a total of 4 blowholes 5 are arranged, and blowholes 5 are arranged at intervals of 600 mm in the second direction, a total of 3 blowholes 5 are arranged, and a total of 12 blowholes 5 are arranged.

[0086] A plurality of die plate ribs 6 are arranged at intervals on the bottom of the punch 1 on the side opposite the molding surface 2. The distance from any one of the drain holes 5 to any one of the die plate ribs 6 is greater than 25 mm.

[0087] As shown in FIG. 1, the drain holes 5 are arranged in a staggered pattern on the molding surface 2 of the punch 1. The drain holes 5 are arranged in a staggered pattern on the molding surface 2 of the punch 1. The drain holes 5 are arranged in a staggered pattern on the molding surface 2 of the punch 1. Figure 3 As shown in FIG. 1, the drain holes 5 are arranged in a staggered pattern on the molding surface 2 of the punch 1. The drain holes 5 are arranged in a staggered pattern on the molding surface 2 of the punch 1. The drain holes 5 are arranged in a staggered pattern on the molding surface 2 of the punch 1.

[0088] The processing method of the drain holes 5 will be described below. First, the coordinates of the plurality of drain holes 5 on the molding surface 2 are obtained. Specifically, the predetermined positions of all of the drain holes 5 on the punch 1 are reflected to the 3D model of the stamping die, the coordinates of all of the drain holes 5 are marked on the 3D model, the distance from the coordinates of all of the drain holes 5 marked on the 3D model to the nearest die plate rib 6 is measured, if the distance is less than a minimum threshold, the predetermined position of the corresponding drain hole is adjusted until the distance is greater than the minimum threshold, the coordinates of the drain hole on the 3D model are updated, and finally the coordinates of all of the drain holes 5 are obtained.

[0089] Based on the coordinates of each of the drain holes 5 on the molding area 3, the processing data of the wide diameter portion 5b and the tapered portion 5c of each of the drain holes 5 is made, the wide diameter portion 5b and the tapered portion 5c are processed from the bottom side of the punch 1 based on the processing data of the wide diameter portion 5b and the tapered portion 5c, the coordinates of the pre-guide hole 5aa of the narrow diameter portion 5a and the processing depth of the pre-guide hole 5aa are set based on the coordinates of each of the drain holes 5 on the molding area 3, and further the processing data of the pre-guide hole 5aa of the narrow diameter portion 5a is made, the pre-guide hole 5aa of the narrow diameter portion 5a is processed from the molding area 3 side of the punch 1 at the set processing depth, and the processing of the pre-guide hole 5aa of the narrow diameter portion 5a is continued based on the processing track of the pre-guide hole 5aa of the narrow diameter portion 5a until the narrow diameter portion 5a is processed in communication with the wide diameter portion 5b.

[0090] As described above, the present application has been fully described with reference to the preferred embodiments in the accompanying drawings, but various modifications or changes can be made by those skilled in the art. It is obvious that various modifications and improvements can be made without departing from the spirit and principles of the present application, and any modification, equivalent replacement and improvement made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A stamping die comprising a punch and a die for forming sheet metal, wherein the forming surface of the punch has at least one forming area, characterized in that, A groove is formed in at least one of the forming areas, and a drain hole is provided in the groove, which extends along the thickness direction of the punch.

2. The stamping die according to claim 1, characterized in that, The groove includes a first groove extending along a first direction and spaced apart along a second direction, and a second groove extending along a second direction and spaced apart along the first direction. The first direction and the second direction intersect, and the plurality of first grooves and the plurality of second grooves intersect each other to form a grid-like area.

3. The stamping die according to claim 2, characterized in that, Multiple first grooves and multiple second grooves intersect each other to form multiple intersections, and the drain hole is disposed at the intersection.

4. The stamping die according to claim 2, characterized in that, The drain hole is provided in multiple ways, and at least one of the drain holes is located at the lowest end of the grid-like area.

5. The stamping die according to claim 1, characterized in that, Multiple spaced-apart mold ribs are provided at the bottom of the punch on the side opposite to the forming surface. The distance from the drain hole to any of the mold plate ribs is greater than a set threshold.

6. The stamping die according to claim 5, characterized in that, The distance from the drain hole to any of the mold plate ribs is greater than 25mm.

7. The stamping die according to any one of claims 1 to 6, characterized in that, The drain hole includes a first hole portion, a second hole portion, and a tapered portion connecting the first hole portion and the second hole portion. The first hole and the second hole are interconnected via the tapered portion, and the diameter of the first hole is smaller than the diameter of the second hole.

8. The stamping die according to claim 7, characterized in that, The opening of the first hole and the groove at the edge of the opening are located on the same plane. The second hole is located below the first hole.

9. The stamping die according to claim 8, characterized in that, The first hole is provided with an inverted tapered portion that narrows as it moves from the opening toward the second hole.

10. The stamping die according to any one of claims 2 to 4, characterized in that, The drain holes are provided in multiple ways, and the multiple drain holes are arranged at a certain distance along the first direction and / or the second direction.

11. The stamping die according to claim 10, characterized in that, The interval between any two drain holes in the first direction and / or the second direction is 100mm to 600mm.

12. The stamping die according to claim 3, characterized in that, A first drain hole is provided at the intersection located at the lowest end of the grid-like area, and a predetermined number of drain holes are provided at certain intervals along the first direction and / or the second direction, starting from the first drain hole.

13. The stamping die according to claim 12, characterized in that, The number of drain holes in the first direction is greater than the number of drain holes in the second direction.

14. The stamping die according to claim 12, characterized in that, The first direction is the lateral direction of the grid-like region, and the second direction is the longitudinal direction of the grid-like region.

15. The stamping die according to claim 14, characterized in that, The multiple drain holes are first spaced apart along the transverse direction, and then spaced apart along the longitudinal direction.

16. A method for processing a stamping die, comprising the method for processing a stamping die according to any one of claims 1 to 15, wherein the drain hole includes a first hole portion, a second hole portion, and a tapered portion connecting the first hole portion and the second hole portion, the first hole portion and the second hole portion being interconnected via the tapered portion, and the diameter of the first hole portion being smaller than the diameter of the second hole portion. Its features are, Includes the following steps: Obtain the coordinates of each of the drain holes on the forming area, and based on the coordinates, generate the processing data for the second hole portion and the tapered portion of each of the drain holes; Based on the machining data of the second hole and the tapered portion, the second hole and the tapered portion are machined from the bottom side of the punch; Based on the coordinates, the processing data for the pre-guide hole of the first hole portion of each of the sewage discharge holes is generated; Based on the machining data of the pre-guide hole of the first hole portion, the pre-guide hole of the first hole portion is machined from the forming surface side of the punch to a set machining depth; and The machining continues along the machining trajectory of the pre-guided hole of the first hole until it connects with the second hole and the first hole is machined.

17. The method for processing a stamping die according to claim 16, characterized in that, Obtaining the coordinates of each of the drain holes on the forming area includes: The predetermined positions of all drain holes on the punch are reflected in the 3D digital model of the stamping die; Mark the coordinates of all drain holes on the 3D digital model; Measure the distance from the coordinates of all drain holes in the 3D model to the nearest mold plate reinforcement; and If the distance is less than the minimum threshold, the predetermined position of the corresponding drain hole is adjusted until the distance is greater than the minimum threshold, the coordinates of the drain hole on the 3D model are updated, and finally the coordinates of all drain holes are obtained.

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