A sheet metal bending die

Abstract

The present invention relates to the technical field of sheet metal molds, and in particular to a sheet metal bending mold, comprising an upper mold and a lower mold, wherein the upper mold is located above the lower mold, and the upper and lower positions of the two molds correspond to each other. An extrusion block is fixedly connected to the outer surface of the lower end of the upper mold, and a telescopic block is fixedly connected to the outer surface of the upper end of the lower mold at a position corresponding to the extrusion block. A displacement rod drives a plate to move the sheet metal on the surface of a boss and clamps the sheet metal. With the cooperation of two sets of plates, the center axis of the sheet metal is aligned with the center line of the boss mold cavity, thereby positioning the sheet metal, reducing dependence on experienced employees, and indirectly reducing production costs. After the plate contacts a sheet metal of a larger size, the compression spring inside the displacement block is squeezed by the displacement rod and then contracts. The cooperation between the displacement block and the compression spring enables the structure to limit and fasten sheet metals of different sizes. When the stamping and bending are completed, the upper mold moves upward, and at this time the displacement rod is pulled to reset under the elastic force generated by the reset spring.

Description

Technical Field

[0001] The invention relates to the technical field of sheet metal moulds, in particular to a sheet metal bending mould. Background Art

[0002] Sheet metal has not yet had a relatively complete definition. According to a definition in a foreign professional journal, it can be defined as: Sheet metal is a comprehensive cold processing process for metal sheets (usually less than 6mm), including shearing, punching / cutting / compounding, folding, welding, riveting, splicing, forming (such as car body), etc. Its notable feature is that the thickness of the same part is consistent;

[0003] The existing patent (Announcement No.: CN204934348U) is a stamping and bending die, and in particular, it relates to a split-type stamping and bending die. The punch and die of the utility model are assembled into a whole by sheet-like plates, and the sheet-like plates are fixedly connected. The utility model uses CNC cutting equipment to cut the plate, which has high precision and high efficiency. It is assembled and welded or connected into a whole by bolts and pins, so as to achieve rapid production and rapid assembly, shorten the mold making time, and enable the mold to be quickly put into production trial production, while also creating conditions for the wide application of the mold in production. The utility model is particularly suitable for multi-variety, small batch, complex bending shape, and scientific research trial production. The punch and die of the utility model are assembled from sheet-like plates, and the cross-sectional shape is the shape of the bent part. The sheet-like plate is cut with 5-10mm thick steel plate, and the material can be selected from low-carbon steel, high-quality steel and alloy steel according to the production batch of the bent parts.

[0004] 1. Although the above patent can stamp and bend the piece-type sheet metal, due to the thin thickness of the sheet metal itself, the side wall of the sheet metal will produce a large friction with the inner wall of the mold under high-intensity stamping, resulting in small scratches on the surface of the sheet metal. In the long run, it will also cause mold wear and reduce the stamping accuracy of the mold, which is not conducive to improving the production quality of the product; 2. The above patent requires employees to hold the sheet metal when stamping and bending the sheet metal, and there is no corresponding positioning device. In order to ensure the stamping accuracy of the sheet metal, certain work experience of the employees will be required, which will increase the labor cost of product production.

[0005] Therefore, a sheet metal bending die is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a sheet metal bending die to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sheet metal bending mold, comprising an upper mold and a lower mold, the upper mold is located above the lower mold, and the upper and lower positions of the two molds correspond to each other, the lower end outer surface of the upper mold is fixedly connected to an extrusion block, and the upper end outer surface of the lower mold is fixedly connected to a telescopic block at a position corresponding to the extrusion block, and a telescopic cavity is provided inside the telescopic block, the lower end of the extrusion block is located inside the telescopic block, and the two correspond to each other, a boss is fixedly connected to the middle of the upper end outer surface of the lower mold, the boss is fixedly connected to the telescopic block, a displacement groove is provided on the side of the telescopic block close to the boss, and the ... A displacement rod is slidably connected inside the groove, and both ends of the displacement rod pass through the telescopic block, and a limiting ring is fixedly connected to the annular outer surface of the displacement rod, and a return spring is fixedly connected between the limiting ring and the telescopic block, and the return spring is sleeved on the outer surface of the displacement rod, and a displacement block is provided at the end of the displacement rod close to the boss, and the interior of the displacement block is a hollow structure, one end of the displacement rod extends to the interior of the displacement block of the hollow structure, and the two are matched with each other and movably connected, a compression spring is fixedly connected between the displacement block and the displacement rod, and a back plate is fixedly connected to the end of the displacement block close to the boss, and the end of the extrusion block close to the boss is designed with an inclined structure.

[0008] Preferably, the upper side of one end of the displacement rod away from the boss is designed as an inclined structure, and its inclination angle is complementary to the inclination angle of the inclined surface of the extrusion block. A plurality of groups of circular holes are equidistantly opened at the lower end of the displacement rod, and balls are embedded in the circular holes.

[0009] Preferably, oil storage cavities are symmetrically provided on both sides of the boss mold cavity, the adjacent sides of the two groups of oil storage cavities are open, and an oil delivery block is movably connected therein, the oil delivery block is designed as a T-shaped structure as a whole, and a rubber pad is provided on its edge and corresponds to the oil storage cavity, a spring is fixedly connected between the oil delivery block and the oil storage cavity, and a plurality of groups of oil delivery grooves are equidistantly provided on the upper end of the oil delivery block, the end of the oil delivery groove close to the mold cavity is open, and the oil delivery groove 331 is designed as an inclined structure, an oil filling port is provided on the upper end of the oil storage cavity and is sealed by a rubber plug, an oil return groove is provided on the side of the oil storage cavity away from the oil delivery block, and the inside of the oil storage cavity is fully loaded with lubricating oil.

[0010] Preferably, rolling grooves are provided on adjacent surfaces of the two groups of oil delivery blocks, the rolling grooves are located at the lowest end of the oil delivery grooves, and a roller is rotatably connected to the inside of the rolling grooves via a rotating shaft, oil-absorbing cotton is wrapped around the surface of the roller, and the oil-absorbing cotton is adhered end to end by Velcro.

[0011] Preferably, the boss is fixedly connected to the telescopic block, and guide grooves are provided on the left and right sides of the boss, and guide rods are movably connected inside the guide grooves, the guide rods are designed as an L-shaped structure, the upper end of the guide rod is designed as an inclined structure and corresponds to the inclined surface of the extrusion block, and its horizontal end passes through the boss and the telescopic block, a spring three is fixedly connected between the guide rod and the inner wall of the telescopic cavity, the end of the guide rod away from the telescopic block is fixedly connected with a baffle, and the baffle is also located in the guide groove and movably connected thereto, an oil accumulation cavity is provided at the lower end of the boss mold cavity, the width of the baffle is smaller than the width of the boss and larger than the width of the guide rod, and the length of the two groups of baffles is larger than the length of the oil accumulation cavity.

[0012] Preferably, a filter is provided at the upper end of the oil accumulation chamber, and the edge of the filter is made of magnetic material and is magnetically adsorbed to the oil accumulation chamber by a magnet.

[0013] Preferably, a protrusion is provided at the lower end of the guide rod, an oil pumping box is fixedly connected to the bottom wall of the telescopic cavity, and an oil pumping cavity is opened inside the oil pumping box, an oil pumping block is movably connected inside the oil pumping cavity, a spring is fixedly connected between the oil pumping block and the oil pumping cavity, an oil return pipe is fixedly connected to both the front and rear ends of the oil pumping box, and a one-way valve is provided inside the front end oil return pipe, an end of the rear end oil return pipe away from the oil pumping box is fixedly connected to the oil accumulation cavity and passes through the oil accumulation cavity, the front end of the oil return pipe is fixedly connected to the oil return groove, and a rubber plug is provided between the oil pumping cavity and the oil pumping block.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By adding a series of structures such as an oil storage chamber, an oil delivery block, an oil delivery groove, and a spring 2 to the device, when the sheet metal is pressed and displaced downward, the oil delivery block will be forced to squeeze the lubricating oil inside the oil storage chamber, so that the lubricating oil flows out along the oil delivery groove to lubricate the surface of the sheet metal, thereby reducing the friction between the sheet metal and the boss, which is beneficial to improving product quality;

[0016] 2. By adding a series of structures such as displacement rod, extrusion block, reset spring, displacement block, compression spring, and abutment plate to the device, when the extrusion block extrudes the displacement block, the displacement block drives the abutment plate to move synchronously, thereby resisting and correcting the sheet metal placed on the surface of the boss and clamping it, so that the central axis of the sheet metal corresponds to the mold cavity, thereby ensuring the qualified rate of the sheet metal after stamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is the overall structural view of the present invention;

[0019] Figure 2 A structural view of the boss and the extrusion block of the present invention;

[0020] Figure 3 For the present invention Figure 2 The enlarged schematic diagram of point B in the middle;

[0021] Figure 4 For the present invention Figure 2 The enlarged schematic diagram at A in the middle;

[0022] Figure 5 It is a structural view of the oil transfer block of the present invention.

[0023] Description of reference numerals:

[0024] 1. Upper mold; 11. Extrusion block; 2. Lower mold; 21. Telescopic block; 22. Telescopic cavity; 222. Displacement groove; 23. Reset spring; 24. Displacement block; 25. Compression spring; 26. Abutment plate; 27. Displacement rod; 271. Limiting ring; 272. Ball; 273. Round hole; 3. Boss; 31. Oil storage cavity; 311. Oil return groove; 32. Spring one; 33. Oil delivery block; 331. Oil delivery groove; 332. Rolling groove; 333. Roller; 36. Oil accumulation cavity; 37. Filter; 4. Guide groove; 41. Spring three; 42. Guide rod; 421. Block plate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figures 1 to 5 , the present invention provides a technical solution:

[0027] like Figure 1 and Figure 2 , Figure 3As shown, a sheet metal bending mold comprises an upper mold 1 and a lower mold 2, wherein the upper mold 1 is located above the lower mold 2, and the upper and lower positions of the two molds correspond to each other. An extrusion block 11 is fixedly connected to the outer surface of the lower end of the upper mold 1, and a telescopic block 21 is fixedly connected to the outer surface of the upper end of the lower mold 2 at a position corresponding to the extrusion block 11, and a telescopic cavity 22 is provided inside the telescopic block 21, and the lower end of the extrusion block 11 is located inside the telescopic block 21, and the two correspond to each other. A boss 3 is fixedly connected to the middle of the upper end outer surface of the lower mold 2, and the boss 3 is fixedly connected to the telescopic block 21. A displacement groove 222 is provided on the side of the telescopic block 21 close to the boss 3, and a displacement rod 27 is slidably connected inside the displacement groove 222. Both ends of the displacement rod 27 pass through the telescopic block 21, and a limiting ring 271 is fixedly connected to the annular outer surface of the displacement rod 27, a return spring 23 is fixedly connected between the limiting ring 271 and the telescopic block 21, and the return spring 23 is sleeved on the outer surface of the displacement rod 27, a displacement block 24 is provided at the end of the displacement rod 27 close to the boss 3, and the interior of the displacement block 24 is a hollow structure, one end of the displacement rod 27 extends to the interior of the displacement block 24 of the hollow structure, and the two are matched with each other and movably connected, a compression spring 25 is fixedly connected between the displacement block 24 and the displacement rod 27, and a support plate 26 is fixedly connected to the end of the displacement block 24 close to the boss 3, and the end of the extrusion block 11 close to the boss 3 is designed as an inclined structure.

[0028] By adopting the above technical solution, in order to improve the accuracy of sheet metal stamping and bending, during operation, the upper mold 1 is driven by the hydraulic cylinder to move downward. At this time, the sheet metal is located on the surface of the boss 3. The upper mold 1 moves downward so that the extrusion block 11 moves downward inside the telescopic cavity 22. At this time, the inclined surface of the extrusion block 11 contacts the end of the displacement rod 27. As the upper mold 1 moves downward, the displacement rod 27 inside the telescopic cavity 22 on both sides of the boss 3 is relatively displaced toward the boss 3, so that the displacement rod 27 moves toward the boss 3 under the push of the extrusion block 11 and stretches the reset spring 23 through the limit ring 271, and the displacement rod 27 drives the stop plate 26 to move toward the boss 3, the sheet metal on the surface moves and clamps the sheet metal. With the cooperation of the two sets of abutment plates 26, the central axis of the sheet metal is aligned with the central line of the mold cavity of the boss 3, so as to position the sheet metal, reduce the dependence on experienced employees, and indirectly reduce the production cost. After the abutment plate 26 contacts a sheet metal of a larger size, the compression spring 25 inside the displacement block 24 is squeezed by the displacement rod 27 and then contracts. The cooperation between the displacement block 24 and the compression spring 25 allows the structure to limit and fasten sheet metals of different sizes. When the stamping and bending is completed, the upper mold 1 moves upward. At this time, the displacement rod 27 is pulled back to its original position under the elastic force generated by the reset spring 23.

[0029] As an embodiment of the present invention, Figure 4As shown, the upper side of one end of the displacement rod 27 away from the boss 3 is designed as an inclined structure, and its inclination angle is complementary to the inclination angle of the inclined surface of the extrusion block 11. A plurality of groups of circular holes 273 are equidistantly opened at the lower end of the displacement rod 27, and balls 272 are embedded in the circular holes 273.

[0030] By adopting the above technical solution, based on the above embodiment, the extrusion block 11 moves downward with the upper mold 1, and its inclined surface contacts the inclined surface of the displacement rod 27, thereby reducing the wear of the contact point between the displacement rod 27 and the extrusion block 11. At the same time, the displacement rod 27 slides inside the displacement groove 222, and the wear between the displacement rod 27 and the displacement groove 222 is reduced by the rolling of the ball 272, thereby improving the service life of the device.

[0031] As an embodiment of the present invention, Figure 4 and Figure 5 As shown, oil storage cavities 31 are symmetrically provided on both sides of the mold cavity of the boss 3, and the adjacent sides of the two groups of the oil storage cavities 31 are open, and an oil delivery block 33 is movably connected therein, and the oil delivery block 33 is designed as a T-shaped structure as a whole, and a rubber pad is provided on its edge and corresponds to the oil storage cavity 31. A spring 32 is fixedly connected between the oil delivery block 33 and the oil storage cavity 31, and a plurality of groups of oil delivery grooves 331 are equidistantly provided on the upper end of the oil delivery block 33, and the end of the oil delivery groove 331 close to the mold cavity is in an open state, and the oil delivery groove 331 is designed as an inclined structure, an oil filling port is provided on the upper end of the oil storage cavity 31 and is sealed by a rubber plug, and an oil return groove 311 is provided on the side of the oil storage cavity 31 away from the oil delivery block 33, and the inside of the oil storage cavity 31 is fully loaded with lubricating oil.

[0032] By adopting the above technical solution, when the sheet metal bends as the stamping continues, in order to avoid excessive friction between the sheet metal and the boss 3, the upper mold 1 moves downward to stamp the sheet metal, so that the sheet metal squeezes the oil delivery block 33 inside the mold cavity, and moves toward the oil storage cavity 31 to squeeze the lubricating oil inside the oil storage cavity 31 and compress the spring 1 32. At the same time, the lubricating oil overflows the oil delivery block 33 and enters the oil delivery groove 331, and then flows out through the oil delivery groove 331 to lubricate the surface of the sheet metal, thereby reducing the friction between the sheet metal and the boss 3.

[0033] As an embodiment of the present invention, Figure 4 As shown, rolling grooves 332 are formed on adjacent surfaces of the two groups of oil delivery blocks 33, and the rolling grooves 332 are located at the lowest end of the oil delivery grooves 331, and a roller 333 is rotatably connected to the inside of the rolling grooves 332 via a rotating shaft, and the surface of the roller 333 is wrapped with oil-absorbing cotton, and the oil-absorbing cotton is adhered end to end by Velcro.

[0034] By adopting the above technical scheme, in order to improve the effect of lubricating oil on the sheet metal, during operation, based on the above embodiment, the sheet metal moves toward the bottom end of the mold cavity of the boss 3 as the stamping continues. At this time, the roller 333 is always in contact with the surface of the sheet metal under the elastic force of the spring 32, and rolls when the sheet metal moves downward, and the roller 333 with the oil-absorbing cotton wrapped on the surface contacts the outer surface of the sheet metal in the stamping downward state and rotates, so that the lubricating oil is evenly applied to the surface of the sheet metal, thereby increasing the lubrication range of the lubricating oil. The oil-absorbing cotton is adhered to the ends by Velcro, which is convenient for replacement of the oil-absorbing cotton during maintenance. When the stamping is completed and the sheet metal is taken out, the oil delivery block 33 is reset to prepare for the next stamping under the action of the elastic force of the spring 32.

[0035] As an embodiment of the present invention, Figure 2 As shown, guide grooves 4 are provided on both left and right sides of the inside of the boss 3, and guide rods 42 are movably connected inside the guide grooves 4. The guide rods 42 are designed as an L-shaped structure. The upper end of the guide rod 42 is designed as an inclined structure and corresponds to the inclined surface of the extrusion block 11, and its horizontal end passes through the boss 3 and the telescopic block 21. A spring three 41 is fixedly connected between the guide rod 42 and the inner wall of the telescopic cavity 22. The end of the guide rod 42 away from the telescopic block 21 is fixedly connected with a baffle 421, and the baffle 421 is also located in the guide groove 4 and movably connected thereto. An oil accumulation cavity 36 is provided at the lower end of the mold cavity of the boss 3. The width of the baffle 421 is smaller than the width of the boss 3 and larger than the width of the guide rod 42. The length of the two groups of baffles 421 is larger than the length of the oil accumulation cavity 36.

[0036] By adopting the above technical solution, in order to ensure the lubrication effect, the sheet metal is lubricated every time it is stamped, in order to avoid excessive lubricating oil accumulation in the mold cavity inside the boss 3, affecting the sheet metal processing, and also to reduce the waste of lubricating oil, when the sheet metal moves down along the mold cavity during operation, the two sets of guide rods 42 are subjected to the resistance force generated by the inclined surface of the extrusion block 11 and move toward each other and compress the spring three 41, so that the horizontal end of the guide rod 42 is relatively displaced toward the center of the boss 3 inside the guide groove 4, thereby pushing it to move relative to the center of the boss 3. The fixedly connected baffle plate 421 moves, so that the two groups of baffle plates 421 are closed, thereby ensuring that the sheet metal is stamped and bent. When the stamping is completed, the guide rod 42 loses the resistance of the extrusion block 11 and is reset under the tension generated by the spring three 41 and opens the oil accumulation chamber 36. At this time, the baffle plate 421 is pulled and reset by the guide rod 42, and the surface of the baffle plate 421 is scraped by the edge of the guide groove 4, and the lubricating oil remaining on the surface after the last stamping is scraped into the inside of the oil accumulation chamber 36, thereby completing the recovery of the lubricating oil and reducing the waste of the lubricating oil.

[0037] As an embodiment of the present invention, Figure 2As shown, a filter screen 37 is disposed at the upper end of the oil accumulation chamber 36, and the edge of the filter screen 37 is made of a magnetic material and is magnetically attracted to the oil accumulation chamber 36 by a magnet.

[0038] By adopting the above technical solution, due to the change in surface deformation tension of the sheet metal each time it is stamped, a small amount of iron filings will lift up and fall off, resulting in a small amount of debris inside the mold cavity. These debris drip into the oil accumulation chamber 36 together with the lubricating oil, affecting the subsequent recovery and treatment of the lubricating oil. During operation, when the lubricating oil mixed with impurities flows into the oil accumulation chamber 36, it is filtered and screened by the filter 37 to ensure the cleanliness of the lubricating oil. The filter 37 and the oil accumulation chamber 36 are magnetically adsorbed by magnets, which is convenient for users to replace and maintain it.

[0039] Working principle: the upper mold 1 is driven by the hydraulic cylinder to move downward. At this time, the sheet metal is located on the surface of the boss 3. The upper mold 1 moves downward so that the extrusion block 11 moves downward inside the telescopic cavity 22. At this time, the inclined surface of the extrusion block 11 contacts the inclined surface of the displacement rod 27. As the upper mold 1 moves downward, the displacement rods 27 inside the telescopic cavities 22 on both sides of the boss 3 are relatively displaced toward the boss 3, so that the displacement rod 27 moves toward the boss 3 under the push of the extrusion block 11 and stretches the reset spring 23 through the limit ring 271. The displacement rod 27 can reduce the degree of wear under the cooperation of the circular hole 273 and the ball 272. The displacement rod 27 drives the abutment plate 26 to move toward the sheet metal on the surface of the boss 3 and clamp the sheet metal. With the cooperation of the two sets of abutment plates 26, the central axis of the sheet metal is aligned with the boss. The center line of the die cavity of table 3 is used to position the sheet metal, thereby reducing the dependence on experienced employees and indirectly reducing the production cost. After the abutment plate 26 contacts the sheet metal of a larger size, the compression spring 25 inside the displacement block 24 is squeezed by the displacement rod 27 and then contracts. The cooperation between the displacement block 24 and the compression spring 25 enables the structure to limit and fasten sheet metals of different sizes. When the stamping and bending is completed, the upper die 1 moves upward. At this time, the displacement rod 27 is pulled back under the elastic force generated by the reset spring 23. The sheet metal squeezes the oil delivery block 33, causing it to move toward the inside of the oil storage cavity 31 to squeeze the lubricating oil inside the oil storage cavity 31 and compress the spring 1 32. At the same time, the lubricating oil is squeezed and the oil level rises, and finally overflows the oil delivery block 33 and enters the inside of the oil delivery tank 331. , and then flows out through the oil delivery groove 331 to lubricate the surface of the sheet metal, thereby reducing the friction between the sheet metal and the boss 3. As the stamping continues, the sheet metal moves toward the bottom of the boss 3 mold cavity. At this time, the roller 333 always maintains a certain friction with the sheet metal surface under the elastic force of the spring 1 32, and rolls when the sheet metal moves down. The oil-absorbing cotton wrapped on the surface of the roller 333 evenly applies the lubricating oil to the surface of the sheet metal, thereby increasing the lubrication range of the lubricating oil. The oil-absorbing cotton is adhered to the head and tail by Velcro, which is convenient for replacement of the oil-absorbing cotton during maintenance. When the stamping is completed and the sheet metal is taken out, the oil delivery block 33 is reset to prepare for the next stamping under the action of the elastic force of the spring 1 32. When the sheet metal moves down along the mold cavity, the two sets of guide rods 42 are subjected to the resistance force generated by the inclined surface of the extrusion block 11. The guide rod 42 moves in the direction of the center of the boss 3 and compresses the spring three 41, so that the horizontal end of the guide rod 42 is relatively displaced inside the guide groove 4 toward the center of the boss 3, thereby pushing the baffle plate 421 fixedly connected thereto to move, so that the two groups of baffle plates 421 are closed, thereby ensuring that the sheet metal is stamped and bent. When the stamping is completed, the guide rod 42 loses the resistance of the extrusion block 11 and is reset under the tension generated by the spring three 41 and opens the oil accumulation chamber 36. At this time, the baffle plate 421 is pulled and reset by the guide rod 42, and the surface of the baffle plate 421 is scraped by the edge of the guide groove 4, and the lubricating oil remaining on the surface after the last stamping is scraped to the surface of the filter screen 37 and then enters the oil accumulation chamber 36. The filter screen 37 and the oil accumulation chamber 36 are magnetically adsorbed by a magnet, which is convenient for users to replace and maintain it.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sheet metal bending die, comprising an upper die (1) and a lower die (2), characterized in that: The upper mold (1) is located above the lower mold (2), and the upper and lower positions of the two molds correspond to each other. The lower end outer surface of the upper mold (1) is fixedly connected to an extrusion block (11), and the upper end outer surface of the lower mold (2) is fixedly connected to a telescopic block (21) at a position corresponding to the extrusion block (11), and a telescopic cavity (22) is provided inside the telescopic block (21). The lower end of the extrusion block (11) is located inside the telescopic block (21), and the two molds correspond to each other. A boss (3) is fixedly connected to the middle of the upper end outer surface of the lower mold (2), and the boss (3) is fixedly connected to the telescopic block (21). A displacement groove (222) is provided on a side of the telescopic block (21) close to the boss (3), and a displacement rod (27) is slidably connected inside the displacement groove (222), and both ends of the displacement rod (27) pass through The telescopic block (21) is provided with a limit ring (271) fixedly connected to the annular outer surface of the displacement rod (27); a return spring (23) is fixedly connected between the limit ring (271) and the telescopic block (21) and is sleeved on the outer surface of the displacement rod (27); a displacement block (24) is provided at one end of the displacement rod (27) close to the boss (3); the interior of the displacement block (24) is a hollow structure; one end of the displacement rod (27) extends into the interior of the displacement block (24) of the hollow structure, and the two are matched and movably connected to each other; a compression spring (25) is fixedly connected between the displacement block (24) and the displacement rod (27); one end of the displacement block (24) close to the boss (3) is fixedly connected to a stop plate (26); and one end of the extrusion block (11) close to the boss (3) is designed as an inclined structure; The boss (3) is fixedly connected to the telescopic block (21), and guide grooves (4) are provided on both left and right sides of the boss (3), and guide rods (42) are movably connected inside the guide grooves (4), and the guide rods (42) are designed in an L-shaped structure. The upper end of the guide rod (42) is designed in an inclined structure and corresponds to the inclined surface of the extrusion block (11), and the horizontal end thereof passes through the boss (3) and the telescopic block (21), and the guide rod (42) is connected to the inner wall of the telescopic cavity (22). A spring three (41) is fixedly connected thereto; one end of the guide rod (42) away from the telescopic block (21) is fixedly connected thereto with a baffle plate (421), and the baffle plate (421) is also located inside the guide groove (4) and movably connected thereto; an oil accumulation cavity (36) is provided at the lower end of the mold cavity of the boss (3); the width of the baffle plate (421) is smaller than the width of the boss (3) and larger than the width of the guide rod (42); and the length of the two groups of baffle plates (421) is larger than the length of the oil accumulation cavity (36).

2. A sheet metal bending die according to claim 1, characterized in that: The upper side of one end of the displacement rod (27) away from the boss (3) is designed as an inclined structure, and its inclination angle is complementary to the inclination angle of the inclined surface of the extrusion block (11). The lower end of the displacement rod (27) is provided with a plurality of groups of circular holes (273) at equal intervals, and balls (272) are embedded in the circular holes (273).

3. The sheet metal bending die according to claim 1, characterized in that: The boss (3) has symmetrically disposed oil storage cavities (31) on both sides of the mold cavity. The adjacent sides of the two groups of the oil storage cavities (31) are open and are movably connected with an oil delivery block (33) inside. The oil delivery block (33) is designed as a T-shaped structure as a whole and has a rubber pad on its edge and is matched with the oil storage cavity (31). A spring (32) is fixedly connected between the oil delivery block (33) and the oil storage cavity (31). The upper end of the oil delivery block (33) has a plurality of groups of oil delivery grooves (331) equidistantly disposed. The end of the oil delivery groove (331) close to the mold cavity is open and is designed as an inclined structure. The upper end of the oil storage cavity (31) has an oil filling port and is sealed by a rubber plug. The side of the oil storage cavity (31) away from the oil delivery block (33) has an oil return groove (311). The oil storage cavity (31) is fully loaded with lubricating oil.

4. A sheet metal bending die according to claim 3, characterized in that: Adjacent surfaces of the two groups of oil delivery blocks (33) are provided with rolling grooves (332), the rolling grooves (332) are located at the lowest end of the oil delivery grooves (331), and a roller (333) is rotatably connected to the inside of the rolling grooves (332) via a rotating shaft, and the surface of the roller (333) is wrapped with oil-absorbing cotton, and the oil-absorbing cotton is adhered end to end by Velcro.

5. The sheet metal bending die according to claim 1, characterized in that: A filter screen (37) is provided at the upper end of the oil accumulation chamber (36), and the edge of the filter screen (37) is made of a magnetic material and is magnetically attracted to the oil accumulation chamber (36) by a magnet.

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