Stamping die and stamping process for stamping small hardware metal parts

Abstract

This invention belongs to the field of stamping dies, and provides a stamping die and stamping process for stamping small hardware metal parts. It includes a base and an upper mounting plate. A lower die is mounted on the base. A pressure block is fixedly mounted on the bottom of the upper mounting plate, and an upper die is fixedly mounted on the bottom of the pressure block. The upper and lower dies cooperate with each other. A guide rod is fixedly mounted on the bottom of the upper mounting plate, and a guide hole is provided on the base for the guide rod to pass through. This invention incorporates an oiling mechanism on the base, driven by the lifting and lowering of the guide rod. This eliminates the need for manual brushing of stretching oil, saving time and improving production efficiency. Furthermore, since each sheet metal is brushed with stretching oil by the oiling mechanism, the coating consistency and uniformity of the stretching oil are high, avoiding product quality differences. Each stamping operation drives the oiling mechanism, preventing missed areas and improving the product qualification rate.

Description

Technical Field

[0001] This invention belongs to the field of stamping dies, and particularly relates to a stamping die for stamping small hardware metal parts and its stamping process. Background Technology

[0002] Metal stamping refers to the process of stamping sheet metal, strip metal, and other materials into parts using metal molds. Stamped parts can be flat, curved, or have various other shapes. Materials typically used for stamped parts include low-carbon steel, high-quality carbon structural steel, aluminum alloys, and stainless steel.

[0003] During the stamping process of metal parts, the metal material undergoes rapid plastic deformation. When the plastic deformation is very large, the metal material is prone to bending. Therefore, before stamping, drawing oil is applied to the metal material. Drawing oil has excellent anti-wear and extreme pressure properties, will not cause scratches or roughening of the workpiece, improves the surface finish of the workpiece, and effectively extends the life of the die.

[0004] Traditionally, the application of stretching oil to metal materials is done manually. Before placing the metal material, workers brush on the stretching oil, then place the material onto the stamping die, and finally start the stamping machine to stamp the metal material. This manual application of stretching oil is not only time-consuming and labor-intensive, but also results in uneven application, leading to quality differences between workpieces. Furthermore, if workers forget to apply the stretching oil due to negligence, it can cause product quality problems and waste materials. Summary of the Invention

[0005] The purpose of this invention is to provide a stamping die and stamping process for stamping small hardware metal parts, aiming to solve the technical problem of quality differences or even product defects caused by manual application of stretching oil in the prior art.

[0006] The present invention is implemented as follows: a stamping die for stamping small hardware metal parts includes a base and an upper mounting plate. The upper mounting plate is installed at the hydraulic press end of the stamping machine, the base is installed below the hydraulic press of the stamping machine, a lower die is installed on the base, a pressure block is fixedly installed at the bottom of the upper mounting plate, and an upper die is fixedly installed at the bottom of the pressure block. The upper die and the lower die cooperate with each other.

[0007] A guide rod is fixedly installed at the bottom of the upper mounting plate, and a guide hole is provided on the base for the guide rod to pass through;

[0008] The base is also equipped with an oiling mechanism, which is used to apply stretching oil to the sheet material.

[0009] The base is also equipped with a drive mechanism. One end of the drive mechanism is mounted on a guide rod. When the guide rod descends, the drive mechanism drives the brushing mechanism to move, thereby brushing the entire surface of the board with stretching oil.

[0010] Further technical solution: The oil brushing mechanism includes a groove formed on the base, a sliding frame slidably installed in the groove, and an oil brush fixedly installed at one end of the sliding frame located at the top of the base. The distance from the bottom of the oil brush to the surface of the base is less than the thickness of the plate.

[0011] Further technical solution: The brushing mechanism also includes an oil replenishment mechanism, which includes an oil storage tank fixedly installed on the base and a temporary storage cavity opened inside the base. The base is also provided with an oil inlet channel and an oil outlet channel. The movement of the oil inlet channel and the oil outlet channel is connected to the temporary storage cavity. The other end of the oil inlet channel is connected to the oil storage tank, and the other end of the oil outlet channel is connected to an oil replenishment pipe. Several oil nozzles are connected to the side of the oil replenishment pipe. Initially, the several oil nozzles are in contact with the side of the brush. An oil inlet check valve is provided in the middle of the oil inlet channel, and an oil outlet check valve is provided in the middle of the oil outlet channel.

[0012] A piston block is slidably installed inside the temporary storage cavity. The piston block is located above the oil inlet and outlet channels. A pressure plate is fixedly connected to the top of the piston block via a connecting rod. A movable groove is opened on the top of the base. The pressure plate is slidably installed inside the movable groove. A third compression spring is connected between the bottom of the pressure plate and the bottom of the movable groove. Initially, the pressure plate is flush with the top of the base.

[0013] Further technical solution: The oil replenishment mechanism also includes an automatic pressing component, which includes a mounting box fixedly installed on a sliding frame. A squeezing block is slidably installed inside the mounting box. A first compression spring is connected between the squeezing block and the mounting box. A guide slope is provided on the side of the squeezing block. The elastic coefficient of the first compression spring is more than twice that of the elastic coefficient of the third compression spring.

[0014] Further technical solution: The oil replenishment mechanism also includes a limiting component, the limiting component includes a second mounting groove opened on the side of the pressure plate, a limiting post is slidably installed inside the second mounting groove, a second compression spring is connected between the limiting post and the second mounting groove, and a limiting hole adapted to the limiting post is opened on the side wall of the movable groove. Initially (when the surface of the pressure plate is flush with the surface of the base), the limiting post can be inserted into the limiting hole;

[0015] One end of the limiting hole is connected to the sliding groove, and a release rod is slidably installed inside the limiting hole. The length of the release rod is equal to the length of the limiting hole.

[0016] A further technical solution: The base is also provided with an oil return groove. Initially, the oil return groove is located below the oil brush. The base is provided with an oil return hole that communicates with the oil storage tank. One end of the oil return groove is connected to the oil return hole.

[0017] Further technical solution: The driving mechanism includes a reciprocating lead screw rotatably installed inside the base. The reciprocating lead screw is threadedly connected to the sliding frame. The base also has an installation cavity communicating with the guide hole. A gear is installed at one end of the reciprocating lead screw that extends into the installation cavity. A first installation groove is provided on the side of the guide rod near the reciprocating lead screw. A rack that matches the gear is fixedly installed inside the first installation groove. The gear and the rack can mesh.

[0018] Further technical solution: The gear is slidably mounted on the reciprocating screw via a sliding key. The reciprocating screw has a keyway adapted to the gear. A sliding plate is also sleeved on the reciprocating screw. The gear is rotatably mounted on the sliding plate via a rotating ring. A directional rod is fixedly connected to the sliding plate. A guide groove is provided on the side of the mounting cavity. The directional rod is slidably mounted in the guide groove. A guide pin is also fixedly connected to the side of the sliding plate. A reversing groove for the guide pin to move is provided on the side of the guide rod.

[0019] To drive the gear movement, an upper reversing assembly and a lower reversing assembly are installed in the reversing slot. The upper reversing assembly includes an upper vertical plate fixedly installed in the reversing slot, and a misaligned paddle is fixedly connected to the top of the upper vertical plate. The misaligned paddle is inclined towards the rack. The lower reversing assembly includes a lower vertical plate fixedly installed in the reversing slot, and a meshing paddle is fixedly connected to the bottom of the lower vertical plate. The meshing paddle is inclined away from the rack. Both the misaligned paddle and the meshing paddle are made of elastic metal.

[0020] A further technical solution: There are two oil replenishment mechanisms, which are symmetrically distributed about the center plane of the base.

[0021] A process for stamping small metal parts using a stamping die includes the following steps:

[0022] 1. Raw material preparation

[0023] 1) Material selection: Select appropriate metal coils or sheets according to product requirements.

[0024] 2) Material processing: If it is a roll material, the roll material needs to be placed on an uncoiling and leveling machine for uncoiling, leveling and cutting into the required width (strip material) so that it can be fed into the punch press.

[0025] 2. Stamping process

[0026] 1) Stamping: The material is placed on the stamping die of the stamping machine and stamped.

[0027] 2) Trimming: Remove the molded part and trim off the excess material from the edges.

[0028] 3) Shaping / Leveling: Performing minor deformations on already formed parts to correct their shape accuracy or obtain small fillets and flatness.

[0029] 3. Post-stamping processing and inspection

[0030] 1) Follow-up processing

[0031] Deburring: The edges of stamped parts may have tiny burrs, which need to be removed by methods such as vibratory grinding, chemical polishing or manual methods to ensure safety and aesthetics.

[0032] Heat treatment: As needed, the parts are quenched, tempered, or otherwise treated to improve their hardness, strength, and wear resistance.

[0033] 2) Surface treatment (using one of the following methods):

[0034] Electroplating: such as zinc plating, nickel plating, and chromium plating, used for rust prevention and aesthetic purposes.

[0035] Spraying / baking paint: Provides protection and color.

[0036] Anodizing: Primarily used on aluminum alloys to improve corrosion resistance and surface hardness.

[0037] Phosphating / blackening: Used for steel parts to prevent rust and as a base coat for coating.

[0038] 3) Quality inspection and packaging

[0039] test:

[0040] First piece inspection: After each shift starts up or the mold is changed, the first few parts produced are fully inspected.

[0041] Inspection: Regular spot checks during the production process.

[0042] Full inspection: 100% inspection of products with extremely high requirements, usually with the help of inspection tools or automated vision inspection equipment.

[0043] Common testing items include: dimensions, thickness, surface defects (scratches, dents), and functionality (flatness, elasticity).

[0044] Packaging: Use appropriate packaging materials (such as blister packs, partitions, rustproof bags) to prevent damage and rust during transportation.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] 1. The present invention provides an oiling mechanism on the base, which is driven by the lifting and lowering of the guide rod. This saves the step of manually applying stretching oil, saves time, and improves production efficiency. Since each sheet is coated with stretching oil by the oiling mechanism, the coating of stretching oil is highly consistent and uniform, avoiding product quality differences. In addition, each stamping will drive the oiling mechanism to move, avoiding missed brushing and improving the product qualification rate.

[0047] 2. In this invention, by setting up an oil replenishment mechanism, the oil brush can be replenished with oil every time it moves to the end of the slide groove, thus avoiding insufficient stretching oil stored on the oil brush and the situation of insufficient stretching oil coating on the sheet.

[0048] 3. In this invention, by setting an automatic pressing component, whenever the sliding frame moves to the end of the chute, the oil replenishment mechanism will automatically replenish the stretching oil to the oil brush, eliminating the need for manual pressing of the pressure plate. This makes the mold simpler to use and saves more time and effort.

[0049] 4. In this invention, by setting a limiting component, when the sliding frame moves to the end of the chute, the sliding frame squeezes the limiting post through the release rod and squeezes the limiting post into the second mounting groove, thereby releasing the limitation on the pressure plate and allowing the extrusion block to squeeze the pressure plate downward. At this time, the oil brush has already contacted the oil nozzle, which solves the problem that the stretching oil will spray out from the oil nozzle if the oil nozzle does not contact the oil brush surface, thus avoiding the waste of stretching oil.

[0050] 5. In this invention, by setting a guide post, an upper reversing assembly, and a lower reversing assembly, during stamping, the lower reversing assembly moves the gear to a position on the same vertical plane as the rack. Then, the guide rod can drive the rack to mesh with the gear, and the gear drives the reciprocating screw to rotate. After stamping is completed, the upper reversing assembly first disengages the gear to prevent the rack and gear from meshing. As a result, the guide rod cannot drive the reciprocating screw to rotate, thus preventing the oil brush from returning. This not only saves stretching oil but also extends the service life of the oil brush. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0052] Figure 2 This is a bottom view of the pressure block structure in this invention.

[0053] Figure 3 This is a schematic diagram of the installation cross-sectional structure of the oil replenishment mechanism in this invention.

[0054] Figure 4 In this invention Figure 3 Enlarged diagram of point A in the middle.

[0055] Figure 5This is a schematic diagram of the installation cross-sectional structure of the drive mechanism in this invention.

[0056] Figure 6 In this invention Figure 5 Enlarged diagram of point B in the middle.

[0057] Figure 7 This is a schematic diagram showing the positions of the lower reversing assembly and the guide post before stamping in this invention.

[0058] Figure 8 This is a schematic diagram showing the positions of the stamped upper reversing assembly and the guide post in this invention.

[0059] In the attached diagram: 1. Base; 2. Oil brushing mechanism; 21. Sliding frame; 22. Oil brush; 23. Slide groove; 24. Oil replenishment mechanism; 241. Oil inlet check valve; 242. Oil inlet channel; 243. Oil outlet channel; 244. Oil reservoir; 245. Oil replenishment pipe; 246. Oil injector; 247. Temporary storage chamber; 248. First compression spring; 249. Mounting box; 2410. Extrusion block; 2411. Movable groove; 2412. Pressure plate; 2413. Release lever; 2414. Second compression spring; 2415. Limiting post; 2416. Third compression spring. ; 2417, Connecting rod; 2418, Piston block; 25, Oil return hole; 26, Oil return groove; 3, Lower mold; 4, Pressure block; 5, Upper mounting plate; 6, Guide rod; 61, First mounting groove; 62, Directional groove; 7, Upper mold; 8, Drive mechanism; 81, Reciprocating screw; 82, Keyway; 83, Gear; 84, Rotating ring; 85, Sliding plate; 86, Guide groove; 87, Orienting rod; 88, Lower vertical plate; 89, Engaging paddle; 810, Rack; 811, Guide pin; 812, Offset paddle; 813, Upper vertical plate; 9, Mounting cavity. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0061] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0062] like Figures 1-8 As shown, this invention provides a stamping die for stamping small hardware metal parts, including a base 1 and an upper mounting plate 5. The upper mounting plate 5 is installed at the hydraulic press end of the stamping machine, the base 1 is installed below the hydraulic press of the stamping machine, a lower die 3 is installed on the base 1, a pressure block 4 is fixedly installed at the bottom of the upper mounting plate 5, and an upper die 7 is fixedly installed at the bottom of the pressure block 4. The upper die 7 and the lower die 3 cooperate with each other.

[0063] A guide rod 6 is fixedly installed on the bottom of the upper mounting plate 5, and a guide hole is provided on the base 1 for the guide rod 6 to pass through.

[0064] The base 1 is also equipped with an oiling mechanism 2, which is used to apply stretching oil to the sheet material.

[0065] A drive mechanism 8 is also installed on the base 1. One end of the drive mechanism 8 is installed on the guide rod 6. When the guide rod 6 descends, the drive mechanism 8 drives the brushing mechanism 2 to move, so that the brushing mechanism 2 brushes stretching oil on the entire surface of the board.

[0066] Specifically, the worker places the metal sheet on top of the base 1, ensuring the sheet completely covers the lower mold 3. Then, the hydraulic press is activated. The hydraulic press, via the upper mounting plate 5, lowers the pressure block 4, guide rod 6, and upper mold 7. The guide rod 6, through the drive mechanism 8, moves the oiling mechanism 2, which applies stretching oil to the surface of the sheet. When the oiling mechanism 2 moves to the other side of the base 1, the pressure block 4 moves the upper mounting plate 5 to press the sheet onto it, forcing it into the lower mold 3 to form the sheet. Then, the hydraulic press can lift the pressure block 4 to remove the stamped product and reposition the sheet. This process saves the manual stretching oil application step, saving time and improving production efficiency. Furthermore, since each sheet is brushed with stretching oil by the oiling mechanism 2, the coating consistency and uniformity of the stretching oil are high, avoiding product quality differences. Each stamping operation also moves the oiling mechanism 2, preventing missed areas and improving the product qualification rate.

[0067] The present invention provides a stamping die for stamping small hardware metal parts. In this embodiment, the oiling mechanism 2 includes a groove 23 opened on the base 1. A sliding frame 21 is slidably installed in the groove 23. An oil brush 22 is fixedly installed at one end of the sliding frame 21 located at the top of the base 1. The distance from the bottom of the oil brush 22 to the surface of the base 1 is less than the thickness of the sheet metal.

[0068] Specifically, the output end of the drive mechanism 8 is connected to the sliding frame 21 via a transmission.

[0069] This invention provides a stamping die for stamping small hardware metal parts. In this embodiment, the oil brushing mechanism 2 further includes an oil replenishment mechanism 24. The oil replenishment mechanism 24 includes an oil storage tank 244 fixedly installed on the base 1 and a temporary storage cavity 247 opened inside the base 1. The base 1 is also provided with an oil inlet channel 242 and an oil outlet channel 243. The movement of the oil inlet channel 242 and the oil outlet channel 243 is connected to the temporary storage cavity 247. The other end of the oil inlet channel 242 is connected to the oil storage tank 244. The other end of the oil outlet channel 243 is connected to an oil replenishment pipe 245. The side of the oil replenishment pipe 245 is connected to several oil spray nozzles 246. Initially, the several oil spray nozzles 246 are all in contact with the side of the oil brush 22. An oil inlet check valve 241 is provided in the middle of the oil inlet channel 242, and an oil outlet check valve is provided in the middle of the oil outlet channel 243.

[0070] A piston block 2418 is slidably installed inside the temporary storage cavity 247. The piston block 2418 is located above the oil inlet channel 242 and the oil outlet channel 243. A pressure plate 2412 is fixedly connected to the top of the piston block 2418 via a connecting rod 2417. A movable groove 2411 is provided on the top of the base 1. The pressure plate 2412 is slidably installed inside the movable groove 2411. A third compression spring 2416 is connected between the bottom of the pressure plate 2412 and the bottom of the movable groove 2411. Initially, the pressure plate 2412 is flush with the top of the base 1.

[0071] Specifically, initially, under the action of gravity, the stretching oil in the oil tank 244 will enter the temporary storage chamber 247 through the oil inlet channel 242, and then the stretching oil will enter the oil outlet channel 243 from the temporary storage chamber 247. Under the principle of communicating vessels, the height of the stretching oil in the oil outlet channel 243 is the same as the height of the stretching oil in the base 1.

[0072] When replenishing the stretching oil, press the pressure plate 2412. The pressure plate 2412 drives the piston block 2418 to descend through the connecting rod 2417. Since the oil inlet check valve 241 cannot pass in reverse, the stretching oil in the temporary storage chamber 247 will be forced into the oil drain channel 243. Then the stretching oil flows from the oil drain channel 243 into the oil replenishment pipe 245 and is sprayed from the oil nozzle 246 onto the oil brush 22.

[0073] When the pressure plate 2412 is released, under the action of the third compression spring 2416, the pressure plate 2412 will drive the piston block 2418 to rise. Since the stretching oil in the drain channel 243 cannot flow back to the storage chamber 247 through the stretching oil check valve, the stretching oil in the oil tank 244 will automatically fill the empty space in the storage chamber 247. Therefore, the oil inlet channel 242, the oil inlet check valve 241, the storage chamber 247, the drain channel 243, the piston block 2418, the connecting rod 2417, the third compression spring 2416 and the pressure plate 2412 form a mechanical stretching oil pump that can automatically return to its original position.

[0074] To ensure that the stretching oil is evenly sprayed onto the oil brush 22, two mechanical stretching oil pumps can be installed, and the two ends of the oil supply pipe 245 can be connected to two oil drain channels 243 respectively. This allows stretching oil to be supplied to the oil supply pipe 245 from two directions, so that the stretching oil in the oil supply pipe 245 can be evenly sprayed onto the oil brush 22 from several oil nozzles 246, thereby improving the stretching oil application effect of the oil brushing mechanism 2.

[0075] The stamping die for stamping small hardware metal parts provided by this invention still requires manual pressing of the pressure plate 2412 by the operator before each stamping to replenish the stretching oil on the oil brush 22. This stamping process is still relatively troublesome. Therefore, in this embodiment, the oil replenishment mechanism 24 also includes an automatic pressing component. The automatic pressing component includes a mounting box 249 fixedly installed on the sliding frame 21. An extrusion block 2410 is slidably installed inside the mounting box 249. A first compression spring 248 is connected between the extrusion block 2410 and the mounting box 249. A guide slope is provided on the side of the extrusion block 2410. The elastic coefficient of the first compression spring 248 is more than twice the elastic coefficient of the third compression spring 2416.

[0076] Specifically, when the sliding frame 21 moves to the end of the slide groove 23, the pressing block 2410 is located directly above the pressure plate 2412.

[0077] When replenishing stretching oil, as the sliding frame 21 moves toward the end of the slide groove 23, the pressing block 2410 gradually moves above the movable groove 2411. Then, under the action of the first compression spring 248, the pressing block 2410 presses the pressure plate 2412, causing the pressure plate 2412 to drive the piston block 2418 to descend, thereby replenishing stretching oil to the oil brush 22. When brushing stretching oil onto the sheet metal, the sliding frame 21 moves the pressing block 2410 out of the movable groove 2411 through the mounting box 249, and the pressure plate 2412 returns to its original position, replenishing stretching oil in the temporary storage cavity 247.

[0078] The present invention provides a stamping die for stamping small hardware metal parts. Due to the presence of the guide slope, during the movement of the sliding frame 21 towards the end of the slide groove 23, the end of the extrusion block 2410 moves into the movable groove 2411 and extrudes the pressure plate 2412, causing some of the drawing oil in the temporary storage cavity 247 to be sprayed out from the oil nozzle 246. However, at this time, the oil nozzle 246 does not contact the surface of the oil brush 22, which may result in waste of the sprayed drawing oil. Therefore, in this embodiment, the supplementary... The oil mechanism 24 also includes a limiting component, which includes a second mounting groove opened on the side of the pressure plate 2412. A limiting post 2415 is slidably installed inside the second mounting groove. A second compression spring 2414 is connected between the limiting post 2415 and the second mounting groove. A limiting hole adapted to the limiting post 2415 is opened on the side wall of the movable groove 2411. Initially (when the surface of the pressure plate 2412 is flush with the surface of the base 1), the limiting post 2415 can be inserted into the limiting hole.

[0079] One end of the limiting hole is connected to the sliding groove 23, and a release rod 2413 is slidably installed inside the limiting hole. The length of the release rod 2413 is equal to the length of the limiting hole.

[0080] Specifically, during the process of the sliding frame 21 driving the extrusion block 2410 to move towards the movable groove 2411, the pressure plate 2412 cannot descend because the limiting post 2415 is inserted into the limiting hole. When the sliding frame 21 moves to the end of the sliding groove 23, the sliding frame 21 extrudes the limiting post 2415 through the release rod 2413 and extrudes the limiting post 2415 into the second mounting groove, thereby releasing the limitation on the pressure plate 2412, so that the extrusion block 2410 can extrude the pressure plate 2412 to move downward. At this time, the oil brush 22 has already contacted the oil nozzle 246, avoiding the waste of stretching oil.

[0081] The present invention provides a stamping die for stamping small hardware metal parts. After the sliding frame 21 returns to the end of the slide groove 23, it will immediately replenish the stretching oil to the oil brush 22 before the upper die 7 stamps the sheet metal. Before the oil brush 22 brushes the sheet metal with stretching oil again, there will be a time interval. During this time interval, the stretching oil on the oil brush 22 may drip onto the base 1, resulting in waste of stretching oil. Therefore, in this embodiment, the base 1 is also provided with an oil return groove 26. Initially, the oil return groove 26 is located below the oil brush 22. The base 1 is provided with an oil return hole 25 that communicates with the oil storage tank 244. One end of the oil return groove 26 is connected to the oil return hole 25.

[0082] When the stretching oil drips from the oil brush 22, it falls into the oil return groove 26. The stretching oil in the oil return groove 26 flows back into the oil storage tank 244 through the oil return hole 25, thus avoiding the waste of stretching oil.

[0083] The present invention provides a stamping die for stamping small hardware metal parts. In this embodiment, the driving mechanism 8 includes a reciprocating lead screw 81 rotatably installed inside the base 1. The reciprocating lead screw 81 is threadedly connected to the sliding frame 21. The base 1 also has an installation cavity 9 communicating with the guide hole. A gear 83 is installed at one end of the reciprocating lead screw 81 that extends into the installation cavity 9. A first installation groove 61 is provided on the side of the guide rod 6 near the reciprocating lead screw 81. A rack 810 adapted to the gear 83 is fixedly installed inside the first installation groove 61. The gear 83 and the rack 810 can mesh.

[0084] Specifically, when the guide rod 6 moves, the guide rod 6 drives the rack 810 to rise and fall. The rack 810 drives the reciprocating screw 81 to rotate through the gear 83, causing the reciprocating screw 81 to drive the sliding frame 21 to move. The sliding frame 21 drives the oil brush 22 to brush stretching oil onto the plate. When the pressure block 4 contacts the base 1, or when the hydraulic press drives the pressure block 4 to rise to its maximum height, the sliding frame 21 just moves to the end of the slide groove 23. Before the upper mold 7 descends to the position where the bottom of the upper mold 7 is level with the top of the oil brush 22, the sliding frame 21 has already returned to the end of the slide groove 23, thus avoiding interference of the oil brush 22 with the movement of the upper mold 7.

[0085] This invention provides a stamping die for stamping small metal parts. After stamping, when the hydraulic press drives the pressure block 4 to rise, the guide rod 6 still drives the gear 83 to rotate via the rack 810. The gear 83 then drives the sliding frame 21 to return via the reciprocating screw 81. At this time, the oil brush 22 will brush stretching oil on the already formed metal part again. However, according to the process, it is not necessary to brush stretching oil at this time. Therefore, this process not only wastes stretching oil but also causes accelerated wear of the oil brush 22. To solve this problem, in this embodiment, the gear 83 is slidably mounted via a sliding key. Mounted on a reciprocating lead screw 81, the reciprocating lead screw 81 has a keyway 82 adapted to the gear 83, and a sliding plate 85 is also sleeved on the reciprocating lead screw 81. The gear 83 is rotatably mounted on the sliding plate 85 through a rotating ring 84. A directional rod 87 is fixedly connected to the sliding plate 85. A guide groove 86 is opened on the side of the mounting cavity 9. The directional rod 87 is slidably mounted in the guide groove 86. A guide pin 811 is also fixedly connected to the side of the sliding plate 85. A reversing groove 62 for the guide pin 811 to move is opened on the side of the guide rod 6.

[0086] To drive the gear 83, an upper reversing assembly and a lower reversing assembly are installed in the reversing groove 62. The upper reversing assembly includes an upper vertical plate 813 fixedly installed in the reversing groove 62. A misaligned paddle 812 is fixedly connected to the top of the upper vertical plate 813. The misaligned paddle 812 is inclined towards the rack 810. The lower reversing assembly includes a lower vertical plate 88 fixedly installed in the reversing groove 62. A meshing paddle 89 is fixedly connected to the bottom of the lower vertical plate 88. The meshing paddle 89 is inclined away from the rack 810. Both the misaligned paddle 812 and the meshing paddle 89 are made of elastic metal.

[0087] Specifically, the upper reversing assembly is located above the top of the rack 810, and the lower reversing assembly is located below the bottom of the rack 810. The distance from the top of the misaligned paddle 812 to the top of the rack 810 is less than the distance from the top of the oil brush 22 to the surface of the base 1. That is, when the guide rod 6 descends, after the sliding frame 21 moves to the end of the slide groove 23, the guide paddle 811 will move to the top of the misaligned paddle 812, thereby facilitating the reversing of the gear 83 by the misaligned paddle 812.

[0088] When using it, taking the descent of guide rod 6 as an example, such as Figure 7 As shown, the guide rod 6 will drive the lower vertical plate 88, the meshing paddle 89, and the rack 810 to descend. The meshing paddle 89 will first contact the guide post 811, and the guide post 811 will move along the inclined surface of the meshing paddle 89, so that the guide post 811 drives the gear 83 to move towards the rack 810 through the sliding plate 85. As the guide rod 6 descends, the rack 810 will mesh with the gear 83 and drive the gear 83 to rotate. The gear 83 drives the sliding frame 21 to move through the reciprocating screw 81. When the pressure block 4 contacts the base 1, the guide post 811 will move above the misaligned paddle 812. Specifically, the guide post 811 will move along the bottom inclined surface of the misaligned paddle 812. However, since the gear 83 is blocked by the keyway 82, the misaligned paddle 812 will deform away from the rack 810 and then pass over the guide post 811.

[0089] After the stamping is completed, guide rod 6 will move upward, as... Figure 8 As shown, at this time, the guide pin 811 will move along the top inclined surface of the misaligned pinion 812, causing the gear 83 to move away from the rack 810. Then the gear 83 and the rack 810 will be staggered. During the process of the guide rod 6 driving the rack 810 to rise, the rack 810 will not mesh with the gear 83. Therefore, the guide rod 6 cannot drive the sliding frame 21 to move, avoiding the situation where the guide rod 6 drives the sliding frame 21 to return when the hydraulic press drives the pressure block 4 to rise. This not only saves stretching oil but also extends the service life of the oil brush 22.

[0090] The present invention provides a stamping die for stamping small hardware metal parts. When the sheet metal is stamped again, the sliding frame 21 will start to brush stretching oil from one end of the base 1 without oil replenishment mechanism 24. However, since it has been brushed once before, the amount of stretching oil on the oil brush 22 is reduced, which may cause insufficient stretching oil in the second brushing, resulting in the metal part and the pressure block 4 sticking together. Therefore, in this embodiment, there are two oil replenishment mechanisms 24, and the two oil replenishment mechanisms 24 are symmetrically distributed about the center plane of the base 1.

[0091] Specifically, regardless of which end of the slide rail 23 the sliding frame 21 moves to, the oil replenishment mechanism 24 will replenish the stretching oil to the oil brush 22.

[0092] Working principle:

[0093] Place the sheet material on the base 1, then start the hydraulic press. The hydraulic press drives the pressure block 4, guide rod 6, and upper mold 7 to descend. The guide rod 6 will first move the gear 83, and then the rack 810 on the guide rod 6 will mesh with the gear 83, driving the reciprocating screw 81 to rotate. The reciprocating screw 81 drives the keyway 82 to rotate, and the sliding frame 21 drives the oil brush 22 to brush stretching oil on the sheet material. Then, the upper mold 7 will squeeze the sheet material into the lower mold 3 to form the sheet material. Finally, the hydraulic press drives the pressure block 4 to rise, and the formed part can be taken out for subsequent processing.

[0094] The process of stamping small metal parts using stamping dies includes the following steps:

[0095] 1. Raw material preparation

[0096] 1) Material selection: Select appropriate metal coils or sheets according to product requirements. Common materials include SPCC (cold-rolled steel), SECC (galvanized steel), stainless steel, copper alloy, aluminum alloy, etc.

[0097] 2) Material processing: The coiled material is usually placed on an uncoiling and leveling machine for uncoiling, leveling and cutting into the required width (strips) so that it can be fed into the punch press.

[0098] 2. Stamping process

[0099] 1) Stamping: The material is placed on the stamping die of the stamping machine and stamped.

[0100] 2) Trimming: Remove the molded part and trim off the excess material from the edges.

[0101] 3) Shaping / Leveling: Performing minor deformations on already formed parts to correct their shape accuracy or obtain small fillets and flatness.

[0102] 3. Post-stamping processing and inspection

[0103] 1) Follow-up processing

[0104] Deburring: The edges of stamped parts may have tiny burrs, which need to be removed by methods such as vibratory grinding, chemical polishing or manual methods to ensure safety and aesthetics.

[0105] Heat treatment: As needed, the parts are quenched, tempered, or otherwise treated to improve their hardness, strength, and wear resistance.

[0106] 2) Surface treatment (using one of the following methods):

[0107] Electroplating: such as zinc plating, nickel plating, and chromium plating, used for rust prevention and aesthetic purposes.

[0108] Spraying / baking paint: Provides protection and color.

[0109] Anodizing: Primarily used on aluminum alloys to improve corrosion resistance and surface hardness.

[0110] Phosphating / blackening: Used for steel parts to prevent rust and as a base coat for coating.

[0111] 3) Quality inspection and packaging

[0112] test:

[0113] First piece inspection: After each shift starts up or the mold is changed, the first few parts produced are fully inspected.

[0114] Inspection: Regular spot checks during the production process.

[0115] Full inspection: 100% inspection of products with extremely high requirements, usually with the help of inspection tools or automated vision inspection equipment.

[0116] Common testing items include: dimensions, thickness, surface defects (scratches, dents), and functionality (flatness, elasticity).

[0117] Packaging: Use appropriate packaging materials (such as blister packs, partitions, rustproof bags) to prevent damage and rust during transportation.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0119] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stamping die for stamping small metal parts, comprising a base and an upper mounting plate, wherein a lower die is mounted on the base, a pressure block is fixedly mounted on the bottom of the upper mounting plate, and an upper die is fixedly mounted on the bottom of the pressure block, the upper die and the lower die cooperating with each other, a guide rod is fixedly mounted on the bottom of the upper mounting plate, and a guide hole is provided on the base for the guide rod to pass through, characterized in that, The base is also equipped with an oiling mechanism, which is used to apply stretching oil to the sheet material. The oil brushing mechanism includes a groove formed on the base, a sliding frame slidably installed in the groove, and an oil brush fixedly installed at one end of the sliding frame located at the top of the base. The distance from the bottom of the oil brush to the surface of the base is less than the thickness of the plate. The base is also equipped with a drive mechanism, one end of which is mounted on a guide rod. When the guide rod descends, the drive mechanism is used to drive the brushing mechanism to move. The driving mechanism includes a reciprocating lead screw rotatably installed inside the base. The reciprocating lead screw is threadedly connected to the sliding frame. The base also has an installation cavity communicating with the guide hole. A gear is installed at one end of the reciprocating lead screw that extends into the installation cavity. A first installation groove is provided on the side of the guide rod near the reciprocating lead screw. A rack that matches the gear is fixedly installed inside the first installation groove. The gear is slidably mounted on the reciprocating lead screw, and a sliding plate is also sleeved on the reciprocating lead screw. The gear is rotatably mounted on the sliding plate through a rotating ring. A directional rod is fixedly connected to the sliding plate. A guide groove is opened on the side of the mounting cavity. The directional rod is slidably mounted in the guide groove. A guide pin is also fixedly connected to the side of the sliding plate. A reversing groove for the guide pin to move is opened on the side of the guide rod. The deflection slot is equipped with an upper reversing assembly and a lower reversing assembly. The upper reversing assembly includes an upper vertical plate fixedly installed in the deflection slot. A misaligned paddle is fixedly connected to the top of the upper vertical plate and is inclined towards the rack. The lower reversing assembly includes a lower vertical plate fixedly installed in the deflection slot. A meshing paddle is fixedly connected to the bottom of the lower vertical plate and is inclined away from the rack. Both the misaligned paddle and the meshing paddle are made of elastic metal.

2. The stamping die for stamping small hardware metal parts according to claim 1, characterized in that, The brushing mechanism also includes an oil replenishment mechanism, which includes an oil storage tank fixedly installed on the base and a temporary storage cavity opened inside the base. The base is also provided with an oil inlet channel and an oil outlet channel. The movement of the oil inlet channel and the oil outlet channel is connected to the temporary storage cavity. The other end of the oil inlet channel is connected to the oil storage tank, and the other end of the oil outlet channel is connected to an oil replenishment pipe. Several oil nozzles are connected to the side of the oil replenishment pipe. Initially, the several oil nozzles are in contact with the side of the brush. An oil inlet check valve is provided in the middle of the oil inlet channel, and an oil outlet check valve is provided in the middle of the oil outlet channel. A piston block is slidably installed inside the temporary storage cavity. The piston block is located above the oil inlet and outlet channels. A pressure plate is fixedly connected to the top of the piston block via a connecting rod. A movable groove is opened on the top of the base. The pressure plate is slidably installed inside the movable groove. A third compression spring is connected between the bottom of the pressure plate and the bottom of the movable groove. Initially, the pressure plate is flush with the top of the base.

3. The stamping die for stamping small hardware metal parts according to claim 2, characterized in that, The oil replenishment mechanism also includes an automatic pressing component, which includes a mounting box fixedly mounted on a sliding frame. A squeezing block is slidably mounted inside the mounting box. A first compression spring is connected between the squeezing block and the mounting box. A guide slope is provided on the side of the squeezing block. The elastic coefficient of the first compression spring is more than twice that of the elastic coefficient of the third compression spring.

4. The stamping die for stamping small hardware metal parts according to claim 2 or 3, characterized in that, The oil replenishment mechanism also includes a limiting component, which includes a second mounting groove opened on the side of the pressure plate. A limiting post is slidably installed inside the second mounting groove. A second compression spring is connected between the limiting post and the second mounting groove. A limiting hole adapted to the limiting post is opened on the side wall of the movable groove. Initially, the limiting post can be inserted into the limiting hole. One end of the limiting hole is connected to the sliding groove, and a release rod is slidably installed inside the limiting hole. The length of the release rod is equal to the length of the limiting hole.

5. The stamping die for stamping small hardware metal parts according to claim 2, characterized in that, The base is also provided with an oil return groove. Initially, the oil return groove is located below the oil brush. The base is provided with an oil return hole that communicates with the oil storage tank. One end of the oil return groove is connected to the oil return hole.

6. The stamping die for stamping small hardware metal parts according to claim 2, characterized in that, There are two oil replenishment mechanisms, which are symmetrically distributed about the center plane of the base.

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