Die forging die for continuously forging large copper alloy thin-wall deep cylindrical forgings
By using die forging molds continuously forged by large copper alloy thin-walled deep-cylinder forgings, the efficient molding and quality improvement of forgings are achieved, and the problem of difficult to form thin-walled deep-cylinder forgings is solved, and the production efficiency and comprehensive physical and chemical performance of forgings are improved.
Patent Information
- Application Number
- CN202421594089.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-05
AI Technical Summary
Copper alloy thin-walled deep-cylinder forgings are difficult to form during the forging process, resulting in low production efficiency and unstable forging quality.
The die forging molds that are continuously forged with large copper alloy thin-walled deep-cylinder forging, including pre-forged molds and final forging molds. Through the continuous forging of pre-forging and final forging, seamless connection and efficient molding of forging are achieved.
It improves the strength and plasticity of forgings, meets aviation standards, reduces production fire times, saves energy consumption and production costs, and avoids the reworking process caused by forgings due to defects such as cracks and wrinkles.
Smart Images
Figure CN222985626U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of forging and forming, and relates to a die forging die for continuous forging of large copper alloy thin-walled deep cylinder forgings. Background Art
[0002] Copper alloy thin-walled deep cylinder forgings are widely used in the aerospace field. According to the working characteristics of the forgings, copper alloys with excellent thermal conductivity are used as raw materials. In order to achieve higher production efficiency, die forging technology is adopted. However, the thin-walled parts of the forgings are difficult to form. Therefore, it is urgent to improve the forging process of such thin-walled deep cylinders to ensure the qualification of the forgings. Content of the Utility Model
[0003] The purpose of the utility model is that the die of the utility model can obtain a thin-walled deep cylinder forging, without the need for processes such as forging blanking and machining, and realize seamless connection from pre-forging to final forging and one-fire forging forming, so as to fully ensure its service performance requirements.
[0004] Technical Solution:
[0005] Provide a die forging die for continuous forging of large copper alloy thin-walled deep cylinder forgings, including:
[0006] Pre-forging die and final forging die;
[0007] The pre-forging die includes a pre-forging upper die and a pre-forging lower die; a circular positioning boss is added at the bottom of the pre-forging lower die, and a pre-forging punch is arranged at the center of the pre-forging upper die;
[0008] The final forging die includes a final forging upper die and a final forging lower die; a circular positioning boss identical to that of the pre-forging lower die is added at the bottom of the final forging lower die; a final forging punch is arranged at the center of the final forging upper die;
[0009] The entire cavity of the pre-forging die completely coincides with the lower half of the cavity of the final forging lower die;
[0010] The tops of the pre-forging punch and the final forging punch completely coincide.
[0011] Further, the diameter of the circular positioning boss is 1 / 3 of the bottom diameter of the forging, and the depth is 5% of the height of the forging.
[0012] Further, the depth of the cavity of the pre-forging lower die is 55-65% of the height of the final forging.
[0013] Further, the pre-forging punch accounts for 10%-15% of the depth of the final forging punch.
[0014] Further, the outer shape depth of the cavity of the pre-forging upper die is 8-10% of the height of the final forging, and is not less than 50 mm.
[0015] Furthermore, the pre-forging die adopts a flashless design, allowing the top of the cavity to be incompletely filled during pre-forging forming.
[0016] Furthermore, the finish-forging die is designed without a flash at the bridge part and with large convex fillets to facilitate the forming of the forging material.
[0017] Beneficial effects: Compared with the conventional die forging method, this method adopts the way of continuous forging in one heat of pre-forging and finish-forging. During forging, the deformation amount of this forging is ensured, the strength of the forging is improved, the plasticity is also improved, and the comprehensive physical and chemical properties of the forging meet the requirements of aviation standards. At the same time, the number of heating times for the production of this product is reduced, energy consumption is saved, and production costs are saved. Brief Description of the Drawings
[0018] Figure 1 It is a schematic structural diagram of the die forging die.
[0019] Figure 2 It is a schematic diagram of the forging forming process.
[0020] Figure 3 It is a schematic diagram of the forging forming process. Specific Embodiments
[0021] The present invention provides a die forging die for continuous forging of a large copper alloy thin-walled deep cylindrical forging, as Figures 1-3 shown, including:
[0022] A pre-forging die 1 and a finish-forging die 2;
[0023] The pre-forging die includes a pre-forging upper die 11 and a pre-forging lower die 12; a circular positioning boss 121 is added to the bottom of the pre-forging lower die, and a pre-forging punch 111 is arranged at the center of the pre-forging upper die;
[0024] The finish-forging die 2 includes a finish-forging upper die 21 and a finish-forging lower die 22; a circular positioning boss 221 identical to that of the pre-forging lower die is added to the bottom of the finish-forging lower die 22; a finish-forging punch 211 is arranged at the center of the finish-forging upper die 21;
[0025] The entire cavity of the pre-forging die completely coincides with the lower half of the cavity of the finish-forging lower die;
[0026] The tops of the pre-forging punch and the finish-forging punch completely coincide.
[0027] A circular positioning boss is added to the bottom of the pre-forging lower die, with a diameter of about 1 / 3 of the bottom diameter of the forging and a depth of about 5% of the height of the forging.
[0028] Part of the cavity of the pre-forging lower die coincides with part of the cavity of the finish-forging lower die, and the external shape of the cavity of the pre-forging upper die coincides with part of the cavity of the finish-forging lower die;
[0029] Part of the pre-forging punch and the finish-forging punch coincide.
[0030] The pre-forging die is adjusted according to the deformation amount of the forging blank, and the finish-forging die is adjusted according to the deformation amount of the pre-forged part.
[0031] The shape of the upper pre-forging die is designed according to the difference between the preset total deformation amount of the forging blank and the deformation amount of the pre-forged part.
[0032] In terms of the overall shape, more than 30% of the pre-forging die is close to the forging blank, and more than 50% is close to the finish-forging die.
[0033] The pre-forging die adopts a flashless design, and incomplete filling at the top of the cavity is allowed during pre-forging forming.
[0034] The depth of the cavity of the lower pre-forging die is about 55 - 65% of the height of the finish-forged part.
[0035] The depth of the center punch of the upper pre-forging die is 10% - 15% of the center depth of the finish-forged part.
[0036] The depth of the outer shape of the cavity of the upper pre-forging die is 8 - 10% of the height of the finish-forged part and not less than 50 mm.
[0037] A circular positioning boss is added to the bottom of the finish-forging lower die, with a diameter of about 1 / 3 of the bottom diameter of the forging and a depth of about 5% of the height of the forging.
[0038] The finish-forging die is designed without a flash at the bridge part, and large convex fillets are designed to facilitate the forming of the forging material.
[0039] For a certain forging, the material is QCr0.8, the forging contour dimensions are a deep cylindrical shape of φ480×φ300×575 mm, the middle concave depth is 470 mm, and the wall thickness is ~90 mm. A 630 KJ impact hammer is selected for production.
[0040] Step 1: Use a blank with dimensions of φ300×857 mm. Place the blank in an electric furnace for preheating at a temperature of 850°C.
[0041] Step 2: Place the blank from Step 1 into the pre-forging die, with the starting air pressure ≥0.65 MPa, and press until the pre-forging die is completely closed.
[0042] Step 3: After the pre-forged part is formed, directly transfer it to the finish-forging die, and the transfer time ≤60 seconds.
[0043] Step 4: The starting air pressure ≥0.7 MPa, and the finish-forged part is pressed and formed.
[0044] The die material is 5CrNiMo; the forging is formed in one heat, and the die cavity is in good condition, all meeting the requirements of the forging drawing.
[0045] It avoids the rework process caused by defects such as cracks and wrinkles in the forging; and improves the die life, which is increased by ~30% compared with the previous ordinary die.
Claims
1. A die forging die for continuous forging of large copper alloy thin-walled deep barrel forgings, characterized in that: include: Pre-forging dies and final forging dies; The pre-forging die includes a pre-forging upper die and a pre-forging lower die; a circular positioning boss is added to the bottom of the pre-forging lower die, and a pre-forging punch is arranged at the center of the pre-forging upper die; The final forging die includes a final forging upper die and a final forging lower die; a circular positioning boss identical to that of the pre-forging lower die is added to the bottom of the final forging lower die; a final forging punch is provided at the center of the final forging upper die; The entire cavity of the pre-forging die completely overlaps with the lower half of the final forging lower die cavity; The top of the pre-forging punch completely overlaps with the top of the final forging punch.
2. The die forging die according to claim 1, characterized in that: The diameter of the circular positioning boss is 1 / 3 of the bottom diameter of the forging, and the depth is 5% of the height of the forging.
3. The die forging die according to claim 1, characterized in that: The depth of the pre-forging lower mold cavity is 55-65% of the final forging height.
4. The die forging die according to claim 1, characterized in that: The pre-forging punch accounts for 10% to 15% of the final forging punch depth.
5. The die forging die according to claim 1, characterized in that: The depth of the pre-forging upper mold cavity is 8-10% of the final forging height and is not less than 50mm.
6. The die forging die according to claim 1, characterized in that: The pre-forging die adopts a burr-free design, which allows the top of the cavity to be incompletely filled during pre-forging.
7. The die forging die according to claim 1, characterized in that: The final forging die is designed without burrs on the bridge part and has large convex corners to facilitate the forming of forging materials.