A forming die for saddle-shaped workpieces

Abstract

The embodiment of the present application discloses a forming die of a saddle-shaped workpiece, the saddle-shaped workpiece has a valley part gradually recessed from left and right sides to the center and a ridge part located at the front end and gradually raised from front and back sides to the center. The forming die comprises an upper die and a lower die, the lower die comprises a lower die plate and a lower die core, the lower die core can move up and down relative to the lower die plate; the upper die comprises an upper die plate; the lower die plate has an arc-shaped recessed part, the upper die plate has an arc-shaped protrusion corresponding to the arc-shaped recessed part; the left and right ends of the lower die core are respectively provided with a first guide protrusion and a second guide protrusion, the first guide protrusion is higher than the left highest point of the saddle-shaped workpiece, and the second guide protrusion is higher than the right highest point of the saddle-shaped workpiece. By adopting the present application, the plate material can be punched to form the saddle-shaped workpiece, the thickness of the workpiece is uniform, and the surface is smooth.

Description

TECHNICAL FIELD

[0001] The present application relates to a stamping die, in particular to a forming die for a saddle-shaped workpiece. BACKGROUND

[0002] A stamping die is a special process equipment for processing materials (metal or non-metal) into parts (or semi-finished products) in cold stamping processing. The existing stamping die generally forms different shapes and surfaces with different radii by stamping a flat metal plate. For the forming of a workpiece with multiple different curved surfaces, the curved surface part is prone to have a thickness lower than the process requirement in the area where the original metal plate extends unevenly, and the gathered material in this area is prone to wrinkle, which cannot meet the customer's part forming requirements. SUMMARY

[0003] The present application provides a forming die for a saddle-shaped workpiece to solve the defects of the prior art, which can stamp a plate to form a saddle-shaped workpiece, and the thickness of the workpiece is uniform and the surface is smooth.

[0004] To solve the above technical problems, the present application provides a forming die for a saddle-shaped workpiece, which has a valley part gradually recessed from the left and right sides to the center and a ridge part located at the front end and gradually rising from the front and back sides to the center. The forming die comprises an upper die and a lower die, the lower die comprises a lower die plate and a lower die core, and the lower die core can move up and down relative to the lower die plate; the upper die comprises an upper die plate; the lower die plate has an arc-shaped recessed part, and the upper die plate has an arc-shaped protrusion corresponding to the arc-shaped recessed part; the left and right ends of the lower die core are respectively provided with a first guide protrusion and a second guide protrusion, the first guide protrusion is higher than the left highest point of the saddle-shaped workpiece, and the second guide protrusion is higher than the right highest point of the saddle-shaped workpiece.

[0005] As an improvement of the above-mentioned scheme, the lower die plate is provided with a core hole in the center, and the lower die core is arranged in the core hole, and the lower die core is connected with a core driving mechanism.

[0006] As an improvement of the above-mentioned scheme, a drawing rib is arranged on the surface of the lower die plate around the core hole.

[0007] As an improvement of the above-mentioned scheme, the drawing rib comprises a left drawing rib and a right drawing rib arranged on the left and right sides of the core hole; the front and back edges of the saddle-shaped workpiece have a preset slope, and the drawing rib further comprises a front drawing rib and a rear drawing rib arranged on the front and back sides of the core hole and parallel to the preset slope.

[0008] As an improvement of the above-mentioned scheme, the upper die plate comprises an upper die forming cavity, and the periphery of the upper die forming cavity is provided with a drawing rib matching cavity matched with the drawing rib.

[0009] As an improvement of the above scheme, the first guide bump is T-shaped, which includes a transverse extension and a longitudinal guide part in the center of the transverse extension, the two sides of the longitudinal guide part are arc-shaped, and the end of the longitudinal guide part is connected with the front end of the saddle-shaped workpiece.

[0010] As an improvement of the above scheme, the lower mold core has a forming surface matched with the profile of the saddle-shaped workpiece, the front and rear edges of the forming surface have smooth transition surfaces connected with the transverse guide surface.

[0011] As an improvement of the above scheme, the upper surfaces of the first guide bump and the second guide bump both have a preset arc.

[0012] The embodiment of the present application has the following beneficial effects:

[0013] The lower mold core and the lower mold plate of the present mold move relatively up and down, and the arc-shaped recess is arranged on the lower mold plate. In the mold closing process, the arc-shaped recess of the lower mold plate is first matched with the upper mold plate to perform the first forming; then the lower mold core is driven to move in the direction of the upper mold to perform the second forming on the workpiece. After the second forming of the workpiece, the workpiece can be moved to another stamping die to punch out the core part of the workpiece to obtain the final product. By using the present mold, the workpiece is formed into a shape similar to the general profile of the final product in the first forming, and the core part of the workpiece is pressed into the shape of the final product in the second forming. Through two pressing processes, the deformation amount of the workpiece in the second forming can be reduced, that is, the stretching rate and the accumulation degree of the sheet metal are reduced, and the shape precision and mechanical properties of the stamped part are improved.

[0014] On the other hand, the lower mold core has a first guide bump and a second guide bump. By arranging the first guide bump and the second guide bump, the resistance of the material fed into the middle region from the left and right sides of the workpiece can be increased, and the feeding speed of the material from the left and right sides of the workpiece can be slowed down, so that material accumulation at the left and right ends of the workpiece due to small stamping deformation can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic view of a sheet metal structure formed by the forming mold of the saddle-shaped workpiece of the present application;

[0016] Figure 2 is a schematic view of the structure of the saddle-shaped workpiece of the present application;

[0017] Figure 3 is a schematic view of the structure of the forming mold of the saddle-shaped workpiece of the present application;

[0018] Figure 4 is a schematic view of the upper mold structure of the present application;

[0019] Figure 5 is a schematic view of the lower mold structure of the present application;

[0020] Figure 6 is Figure 5 is an enlarged view of the lower mold core shown in FIG. 1. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings. It is hereby declared that the up, down, left, right, front, back, inner and outer orientation words appearing or about to appear in the present application are only based on the drawings of the present application, and are not specific limitations on the present application.

[0022] As Figures 1-6 shown, the embodiment of the present application provides a forming die for a saddle-shaped workpiece. The saddle-shaped workpiece 100 has a valley part 101 gradually recessed from left and right sides to the center and a ridge part 102 located at the front end and gradually raised from front and back sides to the center. The forming die comprises an upper die 1 and a lower die 2. The lower die 2 comprises a lower die plate 21 and a lower die core 22, and the lower die core 22 is capable of moving up and down relative to the lower die plate 21. The upper die 1 comprises an upper die plate 11. The lower die plate 21 has an arc-shaped recessed part 211, and the upper die plate 11 has an arc-shaped protrusion 111 corresponding to the arc-shaped recessed part 211. The left and right ends of the lower die core 22 are respectively provided with a first guide protrusion 221 and a second guide protrusion 222. The first guide protrusion 221 is higher than the left highest point of the saddle-shaped workpiece 100, and the second guide protrusion 222 is higher than the right highest point of the saddle-shaped workpiece 100.

[0023] The present die is designed to match the overall characteristics of the saddle-shaped workpiece 100. The lower die core 22 and the lower die plate 21 are designed to move up and down relative to each other. The arc-shaped recessed part 211 is arranged on the lower die plate 21. During the die closing process, the arc-shaped recessed part 211 of the lower die plate 21 is first matched with the upper die plate 11 to perform the first forming. Then the lower die core 22 is driven to move towards the upper die 1 to perform the second forming on the workpiece. After the second forming of the workpiece, the workpiece can be moved to another stamping die to punch out the core part of the workpiece to obtain the final product. By using the present die, the workpiece is formed into a shape similar to the general outline of the final product during the first forming, and the core part of the workpiece is pressed into the shape of the final product during the second forming. Through two pressing processes, the deformation amount of the workpiece during the second forming can be reduced, i.e. the stretching rate and the accumulation degree of the sheet metal are reduced, and the shape accuracy and mechanical properties of the stamped part are improved.

[0024] On the other hand, the lower mold core 22 has a first guide bump 221 and a second guide bump 222, by setting the first guide bump 221 and the second guide bump 222, the resistance of the material feeding into the middle region of the workpiece on the left and right sides can be increased, the feeding speed of the material on the left and right sides of the workpiece is slowed down, and the accumulation of material on the left and right ends of the workpiece due to small stamping deformation is avoided.

[0025] In order to realize the above design, it is ensured that the lower mold core 22 and the lower mold plate 21 can move relatively, the lower mold plate 21 is provided with a mold core hole 212 in the center, the lower mold core 22 is arranged in the mold core hole 212, and the lower mold core 22 is connected with a mold core driving mechanism. Specifically, the mold core driving mechanism can be a separately arranged hydraulic cylinder, the hydraulic cylinder is connected with the lower mold core 22 through a mold core connecting plate 23, and drives the lower mold core 22 to lift independently.

[0026] Since the workpiece has positive and negative curved surfaces, as well as flat parts connected thereto, the structure is complex, in order to further ensure the uniformity of the thickness of the formed workpiece. The surface of the lower mold plate 21 is provided with a drawing rib around the mold core hole 212. The upper mold plate 11 includes an upper mold forming cavity 112, and the periphery of the upper mold forming cavity 112 is provided with a drawing rib matching cavity 113 matched with the drawing rib.

[0027] Specifically, the drawing rib includes a left drawing rib 213 and a right drawing rib 214 arranged on the left and right sides of the mold core hole 212; the front and rear edges of the saddle-shaped workpiece 100 have a preset slope 103, and the drawing rib further includes a front drawing rib 215 and a rear drawing rib 216 arranged on the front and rear sides of the mold core hole 212 and parallel to the preset slope 103. When the upper mold plate 11 and the lower mold plate 21 are closed, the corresponding parts of the plate to be pressed will enter the drawing rib, and the stretching speed of the area where the drawing rib is located is controlled. The application also provides the front and rear drawing ribs 215 and 216 arranged on the front and rear sides of the mold core hole 212 and parallel to the preset slope 103, and the inclined drawing rib can accurately control the feeding amount of the saddle area of the saddle-shaped workpiece 100, and prevent excessive wrinkles from occurring in the edge area of the saddle. More preferably, the drawing rib can be two layers, which include an inner layer drawing rib 217 completely surrounding the periphery of the mold core hole 212, and the left drawing rib 213, the right drawing rib 214, the front drawing rib 215 and the rear drawing rib 216 located outside the inner layer drawing rib 217. By setting two layers of drawing ribs, the outer edge of the workpiece can be tightened as a whole by the inner layer drawing rib 217, and then adjusted locally by the left drawing rib 213, the right drawing rib 214, the front drawing rib 215 and the rear drawing rib 216 located outside the inner layer drawing rib 217, which cooperates to assist the forming of the saddle-shaped workpiece 100.

[0028] In addition to the setting of the draw bead, the lower mold core 22 is also designed specifically, and specifically, the first guide bump 221 is T-shaped, including a transverse extension 221a and a longitudinal guide portion 221b located in the center of the transverse extension 221a, both sides of the longitudinal guide portion 221b are arc-shaped, and the end of the longitudinal guide portion 221b is connected with the front end of the saddle-shaped workpiece 100. The upper surfaces of the first guide bump 221 and the second guide bump 222 both have a predetermined arc.

[0029] It should be noted that the first guide bump 221 of the T-shaped can shape the plate material, gradually guide the material entering from the left side of the lower mold core 22 to match the cross-sectional shape of the right side edge of the saddle-shaped workpiece 100, and then enter the core pressing area to press the workpiece into a predetermined shape. The T-shaped is large at the front and small at the back, which is beneficial to the gradual aggregation of relatively flat material to the saddle shape.

[0030] Preferably, the lower mold core 22 has a forming surface 223 matching the profile of the saddle-shaped workpiece 100, the front and rear edges of the forming surface 223 have a smooth transition surface 224, and the smooth transition surface 224 is connected with a transverse guide surface 225. The transverse guide surface 225 is a relatively smooth surface that can fully open the plate material, and then enter the smooth transition surface 224, which is used to connect the transverse guide surface 225 and the forming surface 223. The smooth transition surface 224 here drives the material that has been fully opened to turn by its own arc, so that it moves smoothly to the forming surface 223 during the pressing process of the lower mold core 22 and the upper mold plate 11.

[0031] The mold accurately controls the feeding speed of the formed plate material in each direction to meet the forming needs of the saddle-shaped workpiece 100, and the formed workpiece has uniform thickness and smooth surface without wrinkles, meeting the needs of spacecraft devices and other saddle-shaped workpieces.

[0032] The above describes the preferred embodiments of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements are also considered within the scope of protection of the present application.

Claims

1. A forming die for a saddle-shaped workpiece, the saddle-shaped workpiece having a valley portion gradually recessed from left and right sides to a center and a ridge portion gradually raised from front and back sides to the center at a front end, the forming die comprising: an upper die and a lower die, the lower die comprising a lower die plate and a lower die core, the lower die core being vertically movable relative to the lower die plate; the upper die comprising an upper die plate; the lower die plate having an arc-shaped recess, the upper die plate having an arc-shaped protrusion corresponding to the arc-shaped recess; the lower die core having a forming surface matching a profile of the saddle-shaped workpiece, the forming surface having a first guide protrusion and a second guide protrusion at left and right ends thereof, respectively, the first guide protrusion being higher than a left-side highest point of the saddle-shaped workpiece, the second guide protrusion being higher than a right-side highest point of the saddle-shaped workpiece; the first guide protrusion being T-shaped, comprising a transverse extension and a longitudinal guide portion at a center of the transverse extension, the longitudinal guide portion having an arc shape at both sides thereof, the longitudinal guide portion being connected to the front end of the saddle-shaped workpiece at a distal end thereof; the lower die plate having a core hole at a center thereof, the lower die core being disposed in the core hole, the lower die core being connected to a core driving mechanism; the lower die plate having a draw bead around the core hole; the draw bead comprising a left draw bead and a right draw bead disposed at left and right sides of the core hole, respectively; the saddle-shaped workpiece having a pre-set slope at front and back edges thereof, the draw bead further comprising a front draw bead and a back draw bead disposed at front and back sides of the core hole, respectively, and parallel to the pre-set slope; the upper die plate having an upper die forming cavity, the upper die forming cavity having a draw bead cooperating cavity around a periphery thereof, the draw bead cooperating cavity cooperating with the draw bead; the forming surface having a smooth transition surface at front and back edges thereof, and a transverse guide surface connected to an outer side of the smooth transition surface; the first guide protrusion and the second guide protrusion each having a pre-set curvature. ​ ​ ​ ​ ​ 2. The forming die for saddle-shaped workpieces according to claim 1, characterized in that, ​ 3. The forming die for saddle-shaped workpieces according to claim 2, characterized in that, ​ 4. The forming die for saddle-shaped workpieces according to claim 3, characterized in that, ​ 5. The forming die for saddle-shaped workpieces according to claim 4, characterized in that, ​ 6. The forming die for saddle-shaped workpieces according to claim 1, characterized in that, ​ 7. The forming die for saddle-shaped workpieces according to claim 6, characterized in that, ​

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