Clutch flange plate integrally formed through powder metallurgy and forming die of clutch flange plate
By using powder metallurgy integrated molding technology and stepped demolding method, the problems of long production cycle, high cost and low efficiency caused by split design have been solved, and efficient and low-cost part molding has been achieved.
Patent Information
- Application Number
- CN202422834039.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-20
AI Technical Summary
The current powder metallurgy parts forming and manufacturing process uses a split design, which results in long production cycles, high costs and low production efficiency, and is prone to cracking during forming.
By adopting powder metallurgy integrated molding technology, the parts structure and mold design are optimized to achieve one-time pressing molding, and the step demolding method is used to avoid cracks and reduce the number of process steps.
It shortens the production cycle by 30%, reduces production costs by 5-10%, increases production efficiency by 30%, and avoids the generation of molding cracks.
Smart Images
Figure CN223498488U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of powder metallurgy parts processing technology, specifically relating to a powder metallurgy integrally formed clutch flange and its forming mold. Background Technology
[0002] Powder metallurgy parts have advantages such as low manufacturing cost, high processing efficiency, one-time molding, no need for secondary processing after molding, no other metal waste generated during the part molding process, and high resource utilization.
[0003] However, current methods for manufacturing parts typically employ a split design approach. Due to limitations in powder metallurgy molding machines and molding mechanisms, parts with thin-walled end caps and long bosses cannot be integrally pressed. The structure is usually adjusted, splitting the originally integral part into two separate parts, which are then molded individually and subsequently assembled into a single part through press fitting.
[0004] Existing flanges with a split design, such as Figure 1-2 As shown, Figure 1 For existing flange bodies with a split design, please provide drawings. Figure 2 This is a schematic diagram of the corresponding flange product. The existing split design solution involves pressing two separately pressed parts, a rotating disk (a) and a spur gear (b), into a single unit using an interference fit. Figure 2 The separate process steps for separating the product components from the flange after press-fitting are as follows:
[0005] Rotary disc: forming - sintering - carburizing;
[0006] Spur gears: forming - sintering - rough machining - carburizing - finish machining;
[0007] Clutch flange: (rotating disc + spur gear) press-fit - precision machining - finished product;
[0008] As can be seen from the above, the process of this component is relatively complex: forming and pressing, sintering, heat treatment twice, machining three times, and additional pressing and fitting process is also required; based on this process, the production cost of this component is about RMB 8.2, and the production preparation cycle is about 20 days.
[0009] As can be seen from the above process, the pressing method using a split design involves more steps, requiring two molding and pressing processes. Subsequent sintering and heat treatment also require two operations. These additional steps lengthen the manufacturing cycle, increase manufacturing costs, and reduce production efficiency. Furthermore, during demolding after pressing, the thin-walled flange area is particularly prone to cracking, reducing product quality. Utility Model Content
[0010] In response to the problems mentioned in the background art, the existing parts molding and manufacturing scheme using a split design increases the number of processes, resulting in long production cycles, high costs, and low production efficiency. This utility model proposes a powder metallurgy integrated molding clutch flange and its molding mold. By optimizing the overall structure of the part, it can be produced in one pressing. Furthermore, the process of molding and pressing is optimized to avoid cracking.
[0011] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0012] A powder metallurgy integrally formed clutch flange includes an integrally formed flange body and a spur gear. The flange body has a groove as a bearing position, and the spur gear is located at the lower end of the groove. By setting the bearing position of the spur gear in the groove, the product can be smoothly ejected from the mold.
[0013] Preferably, the spur gear has a through hole that is connected to the groove.
[0014] Preferably, the upper edge of the groove is provided with a protrusion, the height of which is higher than the bottom wall of the flange body.
[0015] Preferably, the height difference between the protrusion and the bottom wall of the flange body is less than 2 mm.
[0016] Preferably, the height difference between the protrusion and the bottom wall of the flange body is 1.5 mm.
[0017] Preferably, the inner diameter of the flange body sidewall is increased by 5-10° draft angle.
[0018] Preferably, the inner diameter of the flange body sidewall is increased by 5° draft angle.
[0019] A forming mold for manufacturing any powder metallurgy integrally formed clutch flange, the mold comprising a lower mold and an upper mold located above the lower mold, the upper mold comprising an upper punch and an upper second punch sleeved within the upper punch, the lower mold comprising a mandrel, a lower third punch, a lower second punch, a lower punch, and a middle mold arranged sequentially from the inside out, the upper end faces of the mandrel, the lower third punch, the lower second punch, and the lower punch being staggered within the middle mold to form a powder metallurgy filling cavity; the lower end face of the upper second punch is lower than the lower end face of the upper punch, and a groove is formed on the upper second punch near the filling cavity end; the upper punch and the upper second punch fit against the filling cavity to press and form the product.
[0020] Preferably, the upper end face of the lower two punches is lower than the upper end face of the middle die, and the upper end face of the lower two punches is provided with a groove.
[0021] Preferably, the mandrel passes through the second groove and is flush with the upper surface of the middle mold, the upper surface of the third lower punch is located below the second groove, and the upper surface of the lower punch is lower than the upper surface of the second lower punch.
[0022] Beneficial effects: Compared with the prior art, the present invention has the following advantages:
[0023] (1) This utility model optimizes two parts into one integral part and makes it suitable for powder metallurgy production. It sets up an integral mold structure with two upper and three lower parts and adopts a step demolding method. During demolding, the lower three punches and the lower punch are fixed to the flange body. The lower punch can only be released after the upper punch is released from the product, thus avoiding product cracks due to the upper punch demolding.
[0024] (2) By increasing the draft angle of the inner diameter of the flange sidewall, this utility model is conducive to the demolding of the upper two punches and avoids cracks in the sidewall product. At the same time, it reduces the height difference between the protrusion and the inner wall of the flange body, avoids the low density of the root of the protrusion (tooth) during molding, which leads to loose teeth and reduces the bonding strength between the protrusion (tooth) and the flange. It also adjusts the position of the mounting bearing groove of the component from the bottom wall of the first groove to the second groove, so that the product can be smoothly demolded during molding and pressing.
[0025] (3) The overall design of this utility model optimizes the production process and reduces the number of process steps. The molding, sintering and heat treatment are only done once, and the machining is done twice, eliminating the pressing process. Based on this process, the production preparation cycle is reduced from 20 days to 15 days, the production cost is reduced by 5-10%, and the production efficiency is increased by more than 30%. Attached Figure Description
[0026] Figure 1 This is a side view of the existing flange body with a split design;
[0027] Figure 2 This is a 3D structural diagram of an existing product that uses a split design;
[0028] Figure 3 This is a structural schematic diagram of the flange body of this utility model;
[0029] Figure 4 This is a schematic diagram of the product structure of this utility model using an overall design;
[0030] Figure 5 This is a schematic diagram of the molding die structure for the powder metallurgy integrated clutch flange of this utility model.
[0031] Figure 6 This is a schematic diagram of the structure for step demolding of products according to this utility model. Detailed Implementation
[0032] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0033] like Figures 3-4 As shown, the powder metallurgy integrally formed clutch flange provided in this embodiment includes an integrally formed flange body 3 and a spur gear 9. A groove 31 is provided in the flange body 3 as a bearing position, and a through hole 91 is provided on the spur gear 9. The spur gear 9 is located at the lower end of the groove 31, and the through hole 91 is connected to the groove 31. By positioning the groove 31 of the mounting bearing of the component from the end face of the spur gear to the groove 31, it is easier for the product to be smoothly removed from the mold during molding and pressing.
[0034] A protrusion 32 is provided on the outer periphery of the upper edge of the groove 31. The height of the protrusion 32 is higher than the bottom wall of the flange body 3. In this embodiment, the height difference between the protrusion 32 and the bottom wall of the flange body 3 is 1.5mm.
[0035] In existing split-design products, the height difference between the protrusion 32 and the bottom wall of the flange body 3 is 2.5mm. Compared with existing split-design products, this embodiment reduces its height to avoid the root density of the protrusion (tooth) being too low during molding, which would lead to loose teeth and reduce the bonding strength between the protrusion (tooth) and the flange.
[0036] In the prior art, the side wall and bottom wall of the flange body 3 are perpendicular. Since the side and bottom walls of the existing flanges are thin, cracks are particularly easy to occur during molding and demolding.
[0037] In this embodiment, the draft angle is appropriately increased at the inner diameter sidewall of the flange body 33, that is, the sidewall of the flange body 3 is tilted outward at a certain angle. For example... Figure 3 Increasing the draft angle by 5° to 10° as shown can make the upper two punches demold more smoothly and avoid cracks in the product during demolding.
[0038] In this embodiment, a draft angle of 5° is added.
[0039] In this embodiment, the through hole 91 is cylindrical, and the inner diameter of the through hole 91 is smaller than the inner diameter of the groove 31.
[0040] In this embodiment, a 200T mechanical press is used.
[0041] like Figures 4-5As shown, the forming mold of the powder metallurgy integrated clutch flange provided in this embodiment mainly includes an upper mold and a lower mold located below the upper mold. The upper mold includes an upper punch 2 and an upper second punch 1 sleeved inside the upper punch 2. The lower mold includes a mandrel 8, a lower third punch 7, a lower second punch 6, a lower punch 5 and a middle mold 4 arranged sequentially from the inside to the outside.
[0042] The upper surfaces of the mandrel 8, lower third punch 7, lower second punch 6 and lower punch 5 are staggered in the middle mold 4 to form a powder metallurgy filling cavity; the lower surface of the upper second punch 1 is lower than the lower surface of the upper punch 2, and the upper second punch 1 has a groove 11 near the filling cavity. The upper punch 2 and the upper second punch 1 fit into the filling cavity to press and form the product.
[0043] The upper end face of the second lower punch 6 is lower than the upper end face of the middle die 4, and the upper end face of the second lower punch 6 has a groove 61. The mandrel 8 passes through the groove 61 and is flush with the upper end face of the middle die 4. The upper end face of the third lower punch 7 is located below the groove 61, and the upper end face of the lower punch 5 is lower than the upper end face of the second lower punch 6.
[0044] In this embodiment, a gear space is formed between the mandrel 8 and the lower three-stroke 7.
[0045] In this embodiment, stepped demolding is used during molding and demolding. In conventional demolding, only the lower three-punch 7 pushes out the flange body 3. However, with stepped demolding, not only the lower three-punch 7 presses against the flange body 3, but the lower punch 5 also presses against it simultaneously. The lower punch 5 can only be released after the upper punch 2 is released from the flange body 3, thus avoiding cracks in the product due to the upper punch 2 demolding.
[0046] In this embodiment, the manufacturing process of the clutch flange (integral design) of this application is as follows:
[0047] Forming - Sintering - Machining (rough) - Carburizing - Machining (finish) - Finished product.
[0048] As can be seen from the above, the overall structural design has greatly optimized the process: forming, sintering, and heat treatment are done only once, and machining is done twice, eliminating the press-fitting process; based on this process, the production cost of this part is approximately 7.8 RMB, and the production preparation cycle is approximately 15 days.
[0049] The working principle or usage process of this utility model is as follows: After the mold is assembled, the required raw materials are prepared. The alloy powder is heated to an appropriate temperature to facilitate powder filling. The heated powder metallurgy fills the filling cavity of the lower mold. Then, the upper mold and the lower mold are fitted together. A mechanical press is used in conjunction with the upper mold to apply pressure to the alloy powder in the filling cavity to make the powder bond and form a shape. After pressing is completed, demolding is performed. Demolding is carried out by step demolding. First, the flange body 3 is fixed by the lower three punch 7 and the lower punch 5. After the upper punch 2 and the upper two punch 1 are separated from the flange body 3, the lower punch 5 is separated from the flange body 3 to avoid cracks in the product when the upper punch 2 is demolded.
[0050] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A powder metallurgy integrally formed clutch flange, characterized in that: It includes an integrally formed flange body (3) and a spur gear (9). The flange body (3) has a groove (31) inside as a bearing position. The spur gear (9) is located at the lower end of the groove (31). By setting the bearing position of the spur gear (9) in the groove (31), the product can be easily ejected from the mold.
2. The powder metallurgy integrally formed clutch flange according to claim 1, characterized in that: The spur gear (9) has a through hole (91) which is connected to the groove (31).
3. The powder metallurgy integrally formed clutch flange according to claim 1, characterized in that: The groove (31) has a protrusion (32) on the outer periphery of its upper edge, and the height of the protrusion (32) is higher than the bottom wall of the flange body (3).
4. The powder metallurgy integrally formed clutch flange according to claim 3, characterized in that: The height difference between the protrusion (32) and the bottom wall of the flange body (3) is less than 2 mm.
5. The powder metallurgy integrally formed clutch flange according to claim 4, characterized in that: The height difference between the protrusion (32) and the bottom wall of the flange body (3) is 1.5 mm.
6. The powder metallurgy integrally formed clutch flange according to claim 1, characterized in that: The inner diameter of the side wall of the flange body (3) is increased by 5° to 10° draft angle.
7. The powder metallurgy integrally formed clutch flange according to claim 6, characterized in that: The inner diameter of the side wall of the flange body (3) is increased by 5° draft angle.
8. A forming mold for manufacturing a powder metallurgy integrally formed clutch flange as described in any one of claims 1-7, the mold comprising a lower mold and an upper mold located above the lower mold, the upper mold comprising an upper punch (2) and an upper second punch (1) sleeved within the upper punch (2), the lower mold comprising a mandrel (8), a lower third punch (7), a lower second punch (6), a lower punch (5), and a middle mold (4) arranged sequentially from the inside to the outside, characterized in that: The upper surfaces of the mandrel (8), lower three punches (7), lower two punches (6) and lower punches (5) are staggered in the middle mold (4) to form a powder metallurgy filling cavity; the lower surface of the upper two punches (1) is lower than the lower surface of the upper punches (2), and the upper two punches (1) has a groove (11) near the filling cavity. The upper punches (2) and the upper two punches (1) fit together with the filling cavity to press and form the product.
9. The forming mold for the powder metallurgy integrally formed clutch flange according to claim 8, characterized in that: The upper end face of the lower two punches (6) is lower than the upper end face of the middle die (4), and the upper end face of the lower two punches (6) is provided with a groove two (61).
10. The forming mold for the powder metallurgy integrally formed clutch flange according to claim 9, characterized in that: The mandrel (8) passes through the second groove (61) and is flush with the upper end face of the middle mold (4). The upper end face of the lower three punches (7) is located below the second groove (61), and the upper end face of the lower punch (5) is lower than the upper end face of the lower two punches (6).