A stamping die applied according to the wall thickness standard of small batch stamping parts
Patent Information
- Application Number
- CN202522258020.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-25
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-10-25
AI Technical Summary
Existing stamping die designs are geared towards mass production, resulting in excessive material consumption, long development cycles, and poor flexibility, failing to meet the needs of rapid response and cost control for small-batch vehicle models.
The mold is made of HT300 material and annealed. The minimum wall thickness of the punch and die is designed according to the target number of stampings. It is suitable for small batch production of stamped parts. The precise matching of guide blocks and limit blocks ensures the efficiency and economy of the mold in small batch production.
The reduction in mold material usage and machining allowance has decreased manufacturing costs and improved the cost-effectiveness of molds per unit part in small-batch production, thus meeting the rapid response requirements of small-batch vehicle models.
Smart Images
Figure CN224926869U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automobile manufacturing, and in particular to a stamping die applied according to the standard of die wall thickness for small batch stamping parts. Background Technology
[0002] With the diversification of consumer demand in the automotive market, the market demand for customized models and small-batch production has increased significantly. The production of stamped parts for these models is characterized by small batches and multiple production runs. However, the current stamping die industry still generally adopts development standards designed for mass-produced stamped parts, pursuing "unlimited life" (target stamping cycles N≥10). 6 The design employs a high safety factor of 3.0 to 4.0, the mold wall thickness is mostly set at 25mm based on empirical values, and the selection of mold materials and processing technology are all centered around the strength redundancy requirements of mass production.
[0003] The existing technology has three major problems: First, there is serious cost redundancy. The high safety factor and thick-walled design of mass-produced molds lead to excessive material consumption, resulting in high tooling (mold) development costs and a significant increase in the unit part mold cost in small-batch production scenarios. Second, the development cycle is too long. Thick-walled molds require larger machining allowances, and machining time accounts for a high proportion, which cannot meet the "rapid market response" requirements of small-batch vehicle models. Third, there is poor flexibility. The design standards of mass-produced molds do not take into account the characteristic of "limited stamping times (usually N≤500,000 times)" of small-batch stamped parts. The strength redundancy exceeds the actual needs, which is contrary to the development direction of flexible production in automobile companies. Utility Model Content
[0004] The purpose of this invention is to provide a stamping die that is applied according to the standard of die wall thickness for small batch stamping parts, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a stamping die applied according to the standard of die wall thickness for small batch stamping parts, suitable for the production of small batch stamping parts with a target stamping number N≤500000 times, including a lower die and an upper die adapted to the lower die, wherein the lower die and the upper die are made of HT300 and have undergone annealing treatment, a lower module is embedded above the lower die, and an upper module is embedded below the upper die, and both the lower module and the upper module are made of HT300; A shaping punch is installed above the lower module, and a shaping die is embedded below the upper module to match the shaping punch. The shaping punch and the shaping die are made of MoCr and have a hardness of HRC50-55.
[0006] Preferably, multiple limiting blocks are fixedly connected to both sides of the lower mold, and the limiting blocks are made of 45# steel.
[0007] Preferably, multiple guide blocks are fixedly connected to both sides of the upper mold, and the guide blocks are made of 45# steel with a surface roughness ≤ Ra1.6; When the upper mold moves toward the lower mold, the guide block fits against the outer wall of the lower mold and the outer wall of the limiting block, and the fitting gap is ≤0.05mm.
[0008] Preferably, a first limiting groove and a second limiting groove are provided at each of the four corners of the upper module, and both the first limiting groove and the second limiting groove are rectangular grooves; The depth of the first limiting groove is 1 / 4 to 1 / 3 of the wall thickness of the upper module, the depth of the second limiting groove is less than that of the first limiting groove, and the verticality tolerance of the groove walls of the two grooves is ≤0.02mm / m.
[0009] Preferably, a first limiting strip and a second limiting strip are fixedly installed at each of the four upper corners of the lower module, and the first limiting strip and the second limiting strip are made of 45# steel or MoCr. When the upper mold moves toward the lower mold, the first limiting strip and the second limiting strip are respectively inserted into the first limiting groove and the second limiting groove, and the fitting gap is ≤0.1mm.
[0010] Preferably, the wall thickness of the shaping punch and the shaping die is determined according to the target number of stampings N: When N≤50000 times, the minimum wall thickness of the molding punch and molding die is ≥25mm; When 50,000 cycles < N ≤ 300,000 cycles, the minimum wall thickness is ≥ 30 mm; When 300,000 cycles < N ≤ 500,000 cycles, the minimum wall thickness is ≥ 35 mm; Furthermore, both the shaping punch and the shaping die underwent N stamping cycles of FE fatigue analysis simulation, confirming that no cracks were generated.
[0011] The technical effects and advantages of this utility model are as follows: The core structure of the mold is made of HT300 material and annealed, a material that combines sufficient strength with cost advantages. Simultaneously, the minimum wall thickness of the shaping punch and die is designed in stages according to the target number of stamping operations, avoiding over-design. Compared to traditional mass-production molds, this mold uses less material. The combined effect of reduced material usage and reduced machining allowance lowers the mold manufacturing cost, significantly reducing the cost per unit part in small-batch production scenarios. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the lower mold of this utility model; Figure 3This is a schematic diagram of the upper mold of this utility model; Figure 4 This is a bottom view of the upper mold of this utility model.
[0013] In the diagram: 1. Lower mold; 11. Lower module; 12. Shaping punch; 13. Limiting block; 14. First limiting strip; 15. Second limiting strip; 2. Upper mold; 21. Upper module; 22. Shaping die; 23. Guide block; 24. First limiting groove; 25. Second limiting groove. Detailed Implementation
[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0015] This utility model provides, for example Figures 1-4 The stamping die shown is a stamping die applied according to the standard of die wall thickness for small batch stamping parts. It is suitable for the production of small batch stamping parts with a target stamping number N≤500000 times. It includes a lower die 1 and an upper die 2 that is adapted to the lower die 1. The lower die 1 and the upper die 2 are made of HT300 and have been annealed. A lower module 11 is embedded above the lower die 1 and an upper module 21 is embedded below the upper die 2. Both the lower module 11 and the upper module 21 are made of HT300. A shaping punch 12 is installed above the lower module 11, and a shaping die 22 that matches the shaping punch 12 is embedded below the upper module 21. The shaping punch 12 and the shaping die 22 are made of MoCr and have a hardness of HRC50-55.
[0016] Furthermore, multiple limiting blocks 13 are fixedly connected to both sides of the lower mold 1, and the limiting blocks 13 are made of 45# steel.
[0017] Furthermore, multiple guide blocks 23 are fixedly connected to both sides of the upper mold 2. The guide blocks 23 are made of 45# steel and the roughness of the guide surface is ≤Ra1.6. When the upper mold 2 moves toward the lower mold 1, the guide block 23 fits against the outer wall of the lower mold 1 and the outer wall of the limiting block 13, and the fitting gap is ≤0.05mm.
[0018] Furthermore, a first limiting groove 24 and a second limiting groove 25 are provided at each of the four corners of the upper module 21, and both the first limiting groove 24 and the second limiting groove 25 are rectangular grooves. The depth of the first limiting groove 24 is 1 / 4 to 1 / 3 of the wall thickness of the upper module 21, the depth of the second limiting groove 25 is less than that of the first limiting groove 24, and the verticality tolerance of the groove walls of the two grooves is ≤0.02mm / m.
[0019] Furthermore, a first limiting strip 14 and a second limiting strip 15 are fixedly installed at the four upper corners of the lower module 11. The first limiting strip 14 and the second limiting strip 15 are made of 45# steel or MoCr. When the upper mold 2 moves toward the lower mold 1, the first limiting strip 14 and the second limiting strip 15 are respectively inserted into the first limiting groove 24 and the second limiting groove 25, and the fitting clearance is ≤0.1mm.
[0020] Furthermore, the wall thickness of the shaping punch 12 and the shaping die 22 is determined according to the target number of stampings N: When N≤50000 times, the minimum wall thickness of the shaping punch 12 and the shaping die 22 is ≥25mm; When 50,000 cycles < N ≤ 300,000 cycles, the minimum wall thickness is ≥ 30 mm; When 300,000 cycles < N ≤ 500,000 cycles, the minimum wall thickness is ≥ 35 mm; Furthermore, both the shaping punch 12 and the shaping die 22 underwent N stamping cycles of FE fatigue analysis simulation, confirming that no cracks were generated.
[0021] The core structure of the mold is made of HT300 material and annealed, a material that combines sufficient strength with cost advantages. Simultaneously, the minimum wall thickness of the shaping punch 12 and shaping die 22 is designed in stages according to the target stamping cycles: ≥25mm for N≤50,000 cycles, ≥30mm for 50,000 < N≤300,000 cycles, and ≥35mm for 300,000 < N≤500,000 cycles, avoiding over-design. Compared to traditional mass-production molds, this mold uses less material. The combined effect of reduced material usage and reduced machining allowance lowers the mold manufacturing cost, significantly reducing the cost per unit part in small-batch production scenarios.
[0022] The raw material to be stamped is placed on the shaping punch 12 of the lower die 1, ensuring that the raw material is centered and fits against the surface of the punch; the stamping equipment is started, and the upper die 2 is driven to move towards the lower die 1; during the process, the guide blocks 23 on both sides of the upper die 2 first fit against the outer wall of the lower die 1 and the outer wall of the limiting block 13 to achieve initial guidance; then, the first limiting strip 14 and the second limiting strip 15 of the lower module 11 are respectively inserted into the first limiting groove 24 and the second limiting groove 25 of the upper module 21 to complete precise positioning; The upper die 2 continues to move downward until the molding die 22 and the molding punch 12 are completely closed. The raw material is stamped and formed by the set stamping pressure. During the mold closing process, the matching design of the mold wall thickness and material ensures the load-bearing strength and avoids mold deformation or cracking. After stamping, the stamping equipment drives the upper die 2 to return to its original position. After the upper die 2 is completely separated from the lower die 1, the formed stamped part on the molding punch 12 is taken out.
[0023] Repeated stamping steps are used to continuously produce small batches of stamped parts. During the production process, based on the target number of stampings N verified by the previous FE fatigue analysis, the surface condition of the mold and the dimensional accuracy of the stamped parts are checked regularly to ensure that the mold performance is stable and the quality of the parts meets the standards throughout the entire production cycle, until the production task of this batch of stamped parts is completed.
[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A stamping die applied according to the standard for die wall thickness in the dimension of small batch stamping parts, comprising a lower die (1) and an upper die (2) adapted to the lower die (1), characterized in that, The lower mold (1) and the upper mold (2) are made of HT300 and have been annealed. The lower mold (1) is embedded with a lower module (11) above it and the upper mold (2) is embedded with an upper module (21) below it. Both the lower module (11) and the upper module (21) are made of HT300. A styling punch (12) is installed above the lower module (11), and a styling die (22) adapted to the styling punch (12) is embedded below the upper module (21). The styling punch (12) and the styling die (22) are made of MoCr and have a hardness of HRC50-55.
2. A stamping die according to claim 1, applied based on the standard for die wall thickness in the dimensions of small-batch stamping parts, characterized in that, Multiple limiting blocks (13) are fixedly connected to both sides of the lower mold (1), and the limiting blocks (13) are made of 45# steel.
3. A stamping die according to claim 2, applicable to the die wall thickness standard for small-batch stamping parts, characterized in that, Multiple guide blocks (23) are fixedly connected to both sides of the upper mold (2). The guide blocks (23) are made of 45# steel and the roughness of the guide surface is ≤Ra1.
6. When the upper mold (2) moves toward the lower mold (1), the guide block (23) fits against the outer wall of the lower mold (1) and the outer wall of the limiting block (13).
4. A stamping die according to claim 1, applied based on the standard for die wall thickness in the dimensions of small-batch stamping parts, characterized in that, The upper module (21) has a first limiting groove (24) and a second limiting groove (25) at each of its four corners. Both the first limiting groove (24) and the second limiting groove (25) are rectangular grooves. The depth of the first limiting groove (24) is 1 / 4 to 1 / 3 of the wall thickness of the upper module (21), and the depth of the second limiting groove (25) is less than that of the first limiting groove (24).
5. A stamping die according to claim 4, applicable to the standard of die wall thickness for small batch stamping parts, characterized in that, The lower module (11) is fixedly installed with a first limiting strip (14) and a second limiting strip (15) at the four upper corners. The first limiting strip (14) and the second limiting strip (15) are made of 45# steel or MoCr. When the upper mold (2) moves toward the lower mold (1), the first limiting strip (14) and the second limiting strip (15) are respectively inserted into the first limiting groove (24) and the second limiting groove (25).
6. A stamping die according to claim 1, applicable to the die wall thickness standard for small-batch stamping parts, characterized in that, The wall thickness of the shaping punch (12) and the shaping die (22) is determined according to the target number of stampings N: When N≤50000 times, the minimum wall thickness of the molding punch (12) and molding die (22) is ≥25mm; When 50,000 cycles < N ≤ 300,000 cycles, the minimum wall thickness is ≥ 30 mm; When 300,000 cycles < N ≤ 500,000 cycles, the minimum wall thickness is ≥ 35 mm.