CN111687365A - Claw utmost point preforging assembling die - Google Patents
Claw utmost point preforging assembling die Download PDFInfo
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- CN111687365A CN111687365A CN202010560607.0A CN202010560607A CN111687365A CN 111687365 A CN111687365 A CN 111687365A CN 202010560607 A CN202010560607 A CN 202010560607A CN 111687365 A CN111687365 A CN 111687365A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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Abstract
The invention discloses a claw-pole pre-forging combined die.A cambered groove is respectively arranged on the outer surface of a die core at the position corresponding to each claw cavity, and two ends of the cambered groove extend to two end surfaces of the die core; each position of the prestressed ring corresponding to the arc-shaped groove is provided with an arc-shaped bulge; after the mold core is completely embedded into the prestress ring, the arc-shaped bulge is inserted into the arc-shaped groove, the bulge surface of the arc-shaped bulge is attached to the groove surface of the arc-shaped groove, and the side surface of the arc-shaped bulge is attached to the side surface of the arc-shaped groove; and the bulge surface and the groove surface as well as the annular inner surface of the prestressed ring and the first annular outer surface of the mold core are in interference fit. Through setting up arc recess and arc arch, the shrink range of two kinds of differences can be assembled to claw utmost point preforging assembling die, distribution that can nimble more, accurate, effectual adjustment mold core prestressing force, is maintaining under the prerequisite that the boss chamber has sufficient intensity, can produce great local pretightning force to the mold core claw chamber, reduces the risk of claw chamber fracture, improves the mould life-span.
Description
Technical Field
The invention belongs to the technical field of automobile generators, and particularly relates to a claw-pole pre-forging combined die.
Background
The claw pole is a key part in an automobile generator, and is usually formed by hot forging, and comprises the procedures of upsetting, pre-forging, finish forging, trimming and the like. Because the claw-pole pre-forging die core has a complex cavity structure, large deformation and large load during forming, severe thermal mechanical fatigue can occur under the action of cyclic thermal stress and mechanical stress, and cracking can occur after few forging times.
The center of the claw pole preforging die core is provided with a boss cavity, and 6-8 claw cavities are distributed on the circumference. The fillets on the two sides of the claw cavity are small, stress concentration is easy to generate, and the boss cavity is also subjected to stress concentration due to large stress, and the two parts are always cracked firstly. The traditional combination die form of the annular prestressed ring and the cylindrical die core is adopted, so that the problem that different die cavities of the die core have different requirements on prestress is difficult to solve. If in order to reduce the fracture risk in claw chamber, generally increase the assembly interference magnitude, though can promote the intensity in boss chamber, nevertheless can form the extrusion effect at claw chamber lateral surface, lead to claw chamber to warp, be more easy fracture on the contrary, also can increase the risk that prestressing force ring ftractures simultaneously. If in order to prevent the claw chamber side to appear extruding effect, reduce the assembly magnitude of interference, can not guarantee the intensity of assembling die again, provide sufficient pretightning force for claw chamber and boss chamber. Therefore, the combined die form of the traditional annular prestress ring and the cylindrical die core is adopted, the intensity of the claw cavity and the boss cavity is difficult to be simultaneously improved by increasing or reducing the pretightening force, and the problems of large stress and premature failure of the claw cavity and the boss cavity caused by unreasonable distribution of the prestress of the die core cannot be solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a claw pole preforging combined die which can generate large local pretightening force to the inner part of a claw cavity on the premise of maintaining enough strength of the boss cavity, so that the prestress on a die core is distributed more reasonably, thereby effectively reducing the stress of the claw cavity and prolonging the service life of the claw pole preforging die.
The technical scheme adopted by the invention is as follows:
a claw pole pre-forging combined die comprises a die core and a pre-stress ring, wherein arc-shaped grooves are respectively formed in the outer surface of the die core at positions corresponding to claw cavities, and two ends of each arc-shaped groove extend to two end faces of the die core respectively; the mold core can be embedded into the prestressed ring, and arc-shaped bulges are arranged on the prestressed ring at the positions corresponding to the arc-shaped grooves; when the mold core is completely embedded into the prestress ring, the arc-shaped bulge is inserted into the arc-shaped groove, the bulge surface of the arc-shaped bulge is attached to the groove surface of the arc-shaped groove, a groove fillet is arranged between the groove surface and the side surface of the arc-shaped groove, a bulge fillet is arranged between the side surface of the arc-shaped bulge and the bulge surface, one section of the annular outer surface of the mold core is a first annular outer surface, the other section of the annular outer surface of the mold core is a second annular outer surface, and fillet transition is adopted between the first annular outer surface and; the bulge surface and the groove surface are in interference fit, the annular inner surface of the prestressed ring and the first annular outer surface are in interference fit, and the diameter of the second annular outer surface is smaller than that of the first annular outer surface; an annular outer surface fillet is arranged between the annular outer surface of the mold core and the side surface of the arc-shaped groove, and an annular inner surface fillet is arranged between the annular inner surface of the prestressed ring and the side surface of the arc-shaped bulge; the side surface of the arc-shaped groove is attached to the side surface of the arc-shaped bulge; the height of the arc-shaped bulge is greater than the depth of the claw cavity; the height of the first annular outer surface is equal to the height of the arc-shaped protrusion.
Preferably, the interference of the assembly between the convex surface and the concave surface is 0.20-0.40mm, the interference of the assembly between the annular inner surface and the first annular outer surface is 0.10-0.30mm, and the interference between the convex surface and the concave surface is greater than the interference between the annular inner surface and the first annular outer surface.
Preferably, the interference between the convex surface and the concave surface is 0.05-0.10mm greater than the interference between the annular inner surface and the first annular outer surface.
Preferably, the radius of the convex fillet is greater than the radius of the concave fillet.
Preferably, the radius of the convex round angle is 4.00-5.00mm, and the radius of the convex round angle is 2.00mm larger than that of the groove round angle.
Preferably, the radius of the fillet of the annular outer surface is greater than the radius of the fillet of the annular inner surface.
Preferably, the radius of the circular outer surface fillet is 4.00-5.00mm, and the radius of the circular outer surface fillet is 2.00mm larger than that of the circular inner surface fillet.
Preferably, the height of the arc-shaped protrusion is 10.00-20.00mm greater than the depth of the claw cavity.
Preferably, the diameter of the first annular outer surface is 2.00mm greater than the diameter of the second annular outer surface.
The invention has the following beneficial effects:
according to the invention, the arc-shaped groove is designed on the outer surface of the mold core, the arc-shaped bulge is arranged on each position of the prestress ring corresponding to the arc-shaped groove, when the mold core is completely embedded into the prestress ring, the arc-shaped bulge is inserted into the arc-shaped groove, and the bulge surface of the arc-shaped bulge is attached to the groove surface of the arc-shaped groove. The convex surface and the concave surface are in interference fit, and the annular inner surface of the prestressed ring and the first annular outer surface of the mold core are in interference fit, so that the claw-pole pre-forging combined mold can be used for assembling two different interference magnitudes. The height of the arc-shaped bulge is greater than the depth of the claw cavity; the height of the first annular outer surface is equal to that of the arc-shaped bulge, and the diameter of the first annular outer surface is larger than that of the second annular outer surface, so that the contact area of the mold core and the prestressed ring can be reduced, and the unit pre-tightening force of the prestressed ring on the mold core is increased. In conclusion, the combined die can generate large local pretightening force for the inner part of the claw cavity on the premise of maintaining the enough strength of the boss cavity, so that the distribution of the prestress on the die core is more reasonable, the stress of the claw cavity is effectively reduced, and the service life of the claw pole preforging die is prolonged.
Furthermore, the interference magnitude of assembly between the convex surface and the groove surface is 0.20-0.40mm, and the interference magnitude of assembly between the annular inner surface and the first annular outer surface is 0.10-0.30 mm; the interference of the assembly between the convex surface and the concave surface is 0.05-0.10mm larger than the interference of the assembly between the annular inner surface and the first annular outer surface. Considering the stress concentration of the mold core claw cavity and the larger stress value, the interference magnitude of the assembly between the convex surface and the groove surface is larger than the interference magnitude of the assembly between the annular inner surface and the annular outer surface, and larger local pretightening force can be generated for the mold core claw cavity.
Further, the radius of the convex fillet is larger than that of the groove fillet, and the radius of the circular outer surface fillet is larger than that of the circular inner surface fillet. In consideration of the elastic strain of the die, a gap is formed at the fillet, so that the generation of large stress concentration between the arc-shaped protrusion and the arc-shaped groove can be prevented in the use process.
Furthermore, the side surface of the arc-shaped groove is attached to the side surface of the arc-shaped bulge. This can prevent that mold core and prestressing force ring from taking place relative rotation in the use, guarantees the forging precision.
Drawings
FIG. 1 is a schematic view of the assembled claw-pole pre-forging segmented mold of the present invention;
FIG. 2 is a longitudinal cross-sectional view of the assembled jaw pre-forging segmented mold of the present invention;
FIG. 3(a) is a schematic view of fillet fit and contact clearance of a claw-pole pre-forging segmented mold of the present invention;
FIG. 3(b) is an enlarged view of the portion A of FIG. 3 (a);
FIG. 4 is a schematic view of the mold core structure of the claw-pole pre-forging combined mold of the present invention;
FIG. 5(a) is a schematic structural view of a pre-stressed ring of the claw-pole pre-forging combined die of the present invention;
FIG. 5(B) an enlarged view of the portion B of FIG. 5 (a);
FIG. 6 is a stress distribution diagram of a conventional claw-pole pre-forging combined mold;
FIG. 7 is a stress distribution diagram of the jaw pre-forging segmented mold of the present invention.
Wherein, 1-mold core, 11-arc groove, 12-claw cavity, 13-groove surface, 14-first annular outer surface, 15-groove fillet, 16-boss cavity, 17-annular outer surface fillet, 18-second annular outer surface, 2-prestress ring, 21-arc bulge, 22-bulge surface, 23-annular inner surface, 24-bulge fillet, 25-annular inner surface fillet, 3-joint part, L-shape1Height of the arched projection, L2-height of the first annular outer surface, L3Height of the arcuate groove, D1Depth of the arc-shaped protrusion, D2Width of the arc-shaped groove, D3-the depth of the arc-shaped groove.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 5(b), the claw-pole pre-forging combined die comprises a die core 1 and a pre-stress ring 2, wherein an arc-shaped groove 11 is respectively formed in each position, corresponding to a claw cavity 12, of the outer surface of the die core 1, and two ends of each arc-shaped groove 11 respectively extend to two end faces of the die core 1; the mold core 1 can be embedded into the prestressed ring 2, and the prestressed ring 2 is provided with arc-shaped bulges 21 at the positions corresponding to the arc-shaped grooves 11; after the mold core 1 is completely embedded into the prestressed ring 2, the arc-shaped bulge 21 is inserted into the arc-shaped groove 11, a bulge surface 22 of the arc-shaped bulge 21 is attached to a groove surface 13 of the arc-shaped groove 11, a groove fillet 15 is arranged between the groove surface 13 and the side surface of the arc-shaped groove 11, a bulge fillet 24 is arranged between the side surface of the arc-shaped bulge 21 and the bulge surface 22, one section of the annular outer surface of the mold core 1 is a first annular outer surface 14, the other section of the annular outer surface is a second annular outer surface 18, and the first annular outer surface 14 and the second annular outer surface 18 are in fillet transition; the convex surface 22 and the concave surface 13 are in interference fit, the annular inner surface 23 and the first annular outer surface 14 are in interference fit, and the diameter of the first annular outer surface 14 is larger than that of the second annular outer surface 18; an annular outer surface fillet 17 is arranged between the annular outer surface of the mold core 1 and the side surface of the arc-shaped groove 11, and an annular inner surface fillet 25 is arranged between the annular inner surface 23 of the prestressed ring 2 and the side surface of the arc-shaped bulge 21; the side surface of the arc-shaped groove 11 is attached to the side surface of the arc-shaped bulge 21; height L of arc-shaped projection 211Greater than the depth of the jaw cavity 12; height L of first annular outer surface 142Equal to the height L of the arc-shaped projection 211。
As a preferred embodiment of the present invention, the interference of the fit between the convex surface 22 and the concave surface 13 is 0.20 to 0.40mm, and the interference of the fit between the annular inner surface 23 and the first annular outer surface 14 is 0.10 to 0.30 mm; the interference of the fit between the convex surface 22 and the concave surface 13 is greater than the interference of the fit between the annular inner surface 23 and the first annular outer surface 14.
As a preferred embodiment of the present invention, the interference of the fit between the convex surface 22 and the concave surface 13 is 0.05-0.10mm greater than the interference of the fit between the annular inner surface 23 and the first annular outer surface 14.
Referring to fig. 2 and 4, the bottom surface of the arc-shaped groove 11 is a section of a raised cylindrical surface, a groove fillet 15 is arranged between the groove surface 13 and the side surface of the arc-shaped groove 11, and an annular outer surface fillet 17 is arranged between the side surface of the arc-shaped groove 11 and the annular outer surface.
Referring to fig. 2, 5(a) and 5(b), the convex surface 22 is a concave cylindrical surface, the curvature of the convex surface 22 is the same as that of the concave surface 15, a convex fillet 24 is arranged between the side surface of the arc-shaped protrusion 21 and the convex surface 22, and an annular inner fillet 25 is arranged between the side surface of the arc-shaped protrusion 21 and the annular inner surface 23.
As a preferred embodiment of the invention, the radius of the convex fillet 24 is larger than the radius of the concave fillet 15.
As a preferred embodiment of the present invention, the radius of the convex rounded corner 24 is 4.00-5.00mm, and the radius of the convex rounded corner 24 is 2.00mm larger than the radius of the concave rounded corner 15.
As a preferred embodiment of the invention, the radius of the annular outer surface fillet 17 is greater than the radius of the annular inner surface fillet 25.
As a preferred embodiment of the present invention, the radius of the annular outer surface fillet 17 is 4.00 to 5.00mm, and the radius of the annular outer surface fillet 17 is 2.00mm greater than the radius of the annular inner surface fillet 25.
As a preferred embodiment of the present invention, the height L of the arc-shaped protrusion 211Is 10.00-20.00mm greater than the depth of the claw cavity 12.
As a preferred embodiment of the invention, the diameter of the first annular outer surface 17 is 2.00mm larger than the diameter of the second annular outer surface 18.
Examples
The claw pole pre-forging combined die of the embodiment is composed of two parts: a mould core 1 and a prestressed ring 2. The groove surface 13 on the mold core 1 is a section of convex cylindrical surface, a groove fillet 15 is arranged between the groove surface 13 and the side surface of the arc-shaped groove 11, and an annular outer surface fillet 17 is arranged between the side surface of the arc-shaped groove 11 and the annular outer surface; the convex surface 22 on the prestressed ring 2 is a section of a concave cylindrical surface, the curvature of the convex surface 22 is the same as that of the concave surface 15, a convex round angle 24 is arranged between the side surface of the arc-shaped bulge 21 and the convex surface 22, one section of the annular outer surface of the mold core 1 is a first annular outer surface 14, the other section of the annular outer surface of the mold core 1 is a second annular outer surface 18, round angle transition is adopted between the first annular outer surface 14 and the second annular outer surface 18, and an annular inner surface round angle 25 is arranged between the side surface of the arc-shaped bulge 21. When the mould core is used, the mould core 1 is completely embedded into the prestressed ring 2, the arc-shaped bulge 21 of the prestressed ring 2 is inserted into the arc-shaped groove 11 of the mould core 1, the bulge surface 22 is attached to the groove surface 13, and the side surface of the arc-shaped bulge 21 is attached to the side surface of the arc-shaped groove 11. Assembling two interference magnitudes by the combined die, wherein the interference of the assembly between the convex surface 22 on the prestressed ring 2 and the groove surface 13 of the die core 1 is 0.20-0.40 mm; the interference of the fit between the annular inner surface 23 of the prestressing ring 2 and the first annular outer surface 14 of the mould core 1 is 0.10-0.30 mm.
The mold core 1 is characterized in that: 8 symmetrical claw cavities 12 are arranged on the mold core 1, a boss cavity 16 is arranged in the center of the mold core, and 8 symmetrical arc-shaped grooves 11 are distributed on the outer surface of the mold core corresponding to the positions of the claw cavities 12; height L of arc-shaped groove 113The depth D of the arc-shaped groove 11 is equal to the height of the mold core35.00-15.00mm in width D2Is 20.00-30.00 mm. A groove fillet 15 with the radius of 2.00-3.00mm is arranged between the groove surface 13 and the side surface of the arc-shaped groove 11, and an annular outer surface fillet 17 with the radius of 4.00-5.00mm is arranged between the side surface of the arc-shaped groove 11 and the annular outer surface; the diameter of the first annular outer surface 14 is 2.00mm greater than the diameter of the second annular outer surface 18, and the height L of the first annular outer surface 142Equal to the height L of the arc-shaped projection 211(ii) a The first annular outer surface 14 and the second annular outer surface 18 are rounded.
The prestressed ring 2 is characterized in that: 8 symmetrical arc-shaped bulges 21 are arranged on the prestressed ring 2, and the distribution positions of the arc-shaped bulges 21 correspond to the distribution positions of the arc-shaped grooves 11; height L of arc-shaped projection 211The depth of the claw cavity is 10.00-20.00mm larger than that of the claw cavity, and the depth D of the arc-shaped bulge 212Depth D of arc-shaped groove 113Equal, 5-15 mm. A bulge with the radius of 4.00-5.00mm is arranged between the bulge surface 22 and the side surface of the arc bulge 21Round corner 24, and annular inner surface round corner 25 with radius of 2.00-3.00mm is arranged between the side surface of arc-shaped bulge 21 and annular inner surface 23.
Fig. 6 is an equivalent stress distribution diagram of a conventional claw-pole pre-forging combined die, when a large interference magnitude of assembly is 0.26mm, the maximum equivalent stress in a claw cavity area of a die core reaches 1240MPa, the maximum equivalent stress is mainly concentrated on two sides of a claw part, and the maximum equivalent stress of a boss cavity is 1250 MPa.
By adopting the claw pole pre-forging combined die structure of the embodiment, the interference magnitude of the assembly on the convex surface of the pre-stress ring is 0.26mm, the interference magnitude on the annular inner surface is 0.20mm, the equivalent stress distribution of the die is shown in fig. 7, the maximum equivalent stress on two sides of the claw part is 1100MPa, and the maximum equivalent stress of the boss cavity is 1240 MPa. Compared with the existing claw pole pre-forging combined die, the claw pole pre-forging combined die disclosed by the invention can enable the pre-stressed ring to generate larger local pre-tightening force for the claw cavity of the die core, so that the maximum equivalent stress at two sides of the claw part is reduced by 11%.
Therefore, through setting up the arc recess at the mold core surface, set up corresponding arch on the prestressing force ring, the magnitude of interference of two kinds of differences of claw utmost point preforging assembling die assembly can be more nimble, accurate, effectual adjustment mold core prestressing force's distribution, under the prerequisite that maintains the boss chamber and have sufficient intensity, can produce great local pretightning force to the mold core claw chamber, reduces the risk of claw chamber fracture, improves the mould life-span.
Claims (10)
1. The claw-pole pre-forging combined die is characterized by comprising a die core (1) and a pre-stress ring (2), wherein an arc-shaped groove (11) is formed in each position, corresponding to a claw cavity (12), of the outer surface of the die core (1), and two ends of each arc-shaped groove (11) extend to two end faces of the die core (1) respectively; arc-shaped bulges (21) are arranged on the prestressed ring (2) at the positions corresponding to the arc-shaped grooves (11); after the mold core (1) is completely embedded into the prestressed ring (2), the arc-shaped bulge (21) is inserted into the arc-shaped groove (11), a bulge surface (22) of the arc-shaped bulge (21) is attached to a groove surface (13) of the arc-shaped groove (11), a groove fillet (15) is arranged between the groove surface (13) and the side surface of the arc-shaped groove (11), a bulge fillet (24) is arranged between the side surface of the arc-shaped bulge (21) and the bulge surface (22), one section of the annular outer surface of the mold core (1) is a first annular outer surface (14), the other section of the annular outer surface is a second annular outer surface (18), and the first annular outer surface (14) and the second annular outer surface (18) are in fillet transition; the bulge surface (22) and the groove surface (13) are in interference fit, the annular inner surface (23) of the prestressed ring (2) and the first annular outer surface (14) are in interference fit, and the diameter of the second annular outer surface (18) is smaller than that of the first annular outer surface (14); an annular outer surface fillet (17) is arranged between the annular outer surface of the mold core (1) and the side surface of the arc-shaped groove (11), and an annular inner surface fillet (25) is arranged between the annular inner surface (23) of the prestressed ring (2) and the side surface of the arc-shaped bulge (21); the side surface of the arc-shaped groove (11) is attached to the side surface of the arc-shaped bulge (21); the height of the arc-shaped bulge (21) is greater than the depth of the claw cavity (12); the height of the first annular outer surface (14) is equal to the height of the arc-shaped protrusion (21).
2. A jaw preforging segment die set forth in claim 1 wherein the interference of the fit between the convex surface (22) and the concave surface (13) is 0.20-0.40mm, the interference of the fit between the annular inner surface (23) and the first annular outer surface (14) is 0.10-0.30mm, and the interference of the fit between the convex surface (22) and the concave surface (13) is greater than the interference of the fit between the annular inner surface (23) and the first annular outer surface (14).
3. A jaw preforging segment die set forth in claim 2 wherein the interference of the fit between the convex surface (22) and the concave surface (13) is 0.05mm to 0.10mm greater than the interference of the fit between the annular inner surface (23) and the first annular outer surface (14).
4. A jaw preforging segment as claimed in claim 1, characterised in that the recess surface (13) is a convex cylindrical surface and the nose surface (22) is a concave cylindrical surface, the curvature of the nose surface (13) and the curvature of the recess surface (22) being the same.
5. A jaw preforging segment as claimed in claim 1, characterised in that the radius of the convex fillet (24) is greater than the radius of the concave fillet (15).
6. A jaw pre-forging segmented mold according to claim 5, wherein the radius of the convex round corner (24) is 4.00-5.00mm, and the radius of the convex round corner (24) is 2.00mm larger than the radius of the groove round corner (15).
7. A jaw preforging segment as claimed in claim 1, characterised in that the radius of the annular outer surface radius (17) is greater than the radius of the annular inner surface radius (25).
8. A jaw pre-forging segmented mold according to claim 7, wherein the radius of the circular outer surface round corner (17) is 4.00-5.00mm, and the radius of the circular outer surface round corner (17) is 2.00mm larger than the radius of the circular inner surface round corner (25).
9. A jaw preforging segment as claimed in claim 1, wherein the height of the arcuate projections (21) is 10.00-20.00mm greater than the depth of the jaw cavity (12).
10. A jaw preforging segment as claimed in claim 1, wherein the diameter of the first annular outer surface (14) is 2.00mm greater than the diameter of the second annular outer surface (18).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010560607.0A CN111687365B (en) | 2020-06-18 | 2020-06-18 | Claw utmost point preforging assembling die |
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|---|---|---|---|
| CN202010560607.0A CN111687365B (en) | 2020-06-18 | 2020-06-18 | Claw utmost point preforging assembling die |
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| CN111687365A true CN111687365A (en) | 2020-09-22 |
| CN111687365B CN111687365B (en) | 2021-09-14 |
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| CN202010560607.0A Active CN111687365B (en) | 2020-06-18 | 2020-06-18 | Claw utmost point preforging assembling die |
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| CN112775373A (en) * | 2020-12-21 | 2021-05-11 | 西南铝业（集团）有限责任公司 | Forging method of disc part |
| CN113996743A (en) * | 2021-11-04 | 2022-02-01 | 哈尔滨工业大学 | Precise hot forming method for deep-cavity irregular cylindrical forging with rib and notch |
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| Publication number | Publication date |
|---|---|
| CN111687365B (en) | 2021-09-14 |
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