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CN-122007301-A - Positioning structure and method for middle split-die hub

CN122007301ACN 122007301 ACN122007301 ACN 122007301ACN-122007301-A

Abstract

The invention relates to the technical field of automobile hub forging, in particular to a positioning structure and a positioning method of an intermediate split die hub, comprising a trimming die and a final forging die for forming the hub, wherein a positioning boss is arranged in a flash area of the final forging die, the trimming die is characterized in that V-shaped locating grooves are formed in corresponding positions of the trimming die, at least four V-shaped locating grooves are formed in the trimming die, the straight edge length of each V-shaped locating groove is not smaller than 4mm, and a discharging gap is formed between a locating boss on the final forging die and each V-shaped locating groove on the trimming die. Through setting up overlap location structure at side cut mould body a week, effectively prevent that the product from rotating around the axis, location boss and V-arrangement constant head tank between final forging mould and the side cut mould simultaneously set up and dodge the blowing clearance, ensure that hot forging does not rock in the side cut mould, the location is accurate, can promote the side cut uniformity by a wide margin, avoid defects such as cutting, chimb, burr, wholly realize accurate, stable side cut location.

Inventors

  • ZHANG GAOQUN
  • GONG SHUDONG

Assignees

  • 芜湖三联锻造股份有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (7)

  1. 1. The positioning structure of the middle split-die hub comprises a trimming die (1) and a finish forging die (7) for forming the hub, and is characterized in that a positioning boss (2) is arranged in a flash area of the finish forging die (7), and a V-shaped positioning groove (8) is arranged at a corresponding position of the trimming die (1); At least four V-shaped positioning grooves (8) are formed in the trimming die (1), and the V-shaped positioning grooves (8) are uniformly distributed along the circumferential direction; The straight edge length of the V-shaped positioning groove (8) is not smaller than 4mm; A discharging gap (3) is arranged between a positioning boss (2) on the final forging die (7) and a V-shaped positioning groove (8) on the trimming die (1), and the distance between the discharging gaps (3) is 0.05mm-0.10mm.
  2. 2. A positioning structure of an intermediate split hub according to claim 1, characterized in that the V-angle of the V-shaped positioning groove (8) is 85 ° to 95 °.
  3. 3. The positioning structure of the middle split-die hub according to claim 1, wherein the positioning boss (2) is of a conical structure, and the height of the positioning boss (2) is 1.2mm-1.8mm.
  4. 4. The positioning structure of the middle split-die hub according to claim 1, wherein a wear-resistant coating (6) is arranged outside a positioning boss (2) of the final forging die (7), and the thickness of the wear-resistant coating (6) is 3-5 μm.
  5. 5. A positioning structure of an intermediate split hub according to claim 3, characterized in that the V angle of the positioning boss (2) is 85 ° -90 ° when the diameter is smaller than a hub of 300mm, the V angle of the positioning boss (2) is 90 ° -95 ° when the diameter is between 300mm and 500mm, and the V angle of the positioning boss (2) is 95 ° -100 ° when the diameter is larger than a hub of 500 mm.
  6. 6. A positioning method of an intermediate split hub, applied to the positioning structure of an intermediate split hub according to any one of claims 1 to 5, comprising the steps of: S101, final forging forming, namely preforming a positioning boss (2) in a flash area of a final forging die (7), monitoring the final forging temperature within a set range, and ensuring that the flash thickness is controlled to be 2.8-3.2mm to form a flash positioning structure embryonic form; s102, transferring the forge piece, namely taking out the hot forge piece with the flash after finish forging, reducing the flash temperature to below 500 ℃ through a cooling system, implementing a fixed-point cooling system after the size is stable, controlling the temperature of a positioning area in a key way, and detecting and recording the temperature after cooling; s103, trimming and positioning, namely placing the forge piece into a trimming die (1), precisely matching a positioning structure on the flying edge with a corresponding structure on the trimming die (1) to form a gap, calculating an actual working gap according to temperature data, and monitoring the positioning gap in real time by a laser range finder to realize precise positioning in the circumferential direction; S104, finishing trimming under positioning constraint, detecting the profile of the hub after trimming, analyzing the quality of the trimming, adjusting positioning parameters, recording positioning precision data, ensuring uniform trimming and avoiding over-cutting or convex edge phenomenon.
  7. 7. The method of positioning an intermediate split hub according to claim 6, wherein the cooling system in step S102 comprises compressed air atomization cooling, the cooling rate is controlled to be 50-80 ℃ per second, and the target temperature is reduced from 800 ℃ to 550 ℃ for less than 2 seconds.

Description

Positioning structure and method for middle split-die hub Technical Field The invention relates to the technical field of automobile hub forging, in particular to a positioning structure and a positioning method of an intermediate split die hub. Background In the automobile hub forging, the automobile middle die-dividing hub process can omit an edge chamfering process and reduce subsequent machining amount to be a main means, however, the die forging process has the problem of eccentric upper and lower dies, so that the upper and lower dies are misplaced, uneven trimming of the hub is caused, and the hub is mainly processed by controlling the coaxiality of a product, relying on the inner contour of a final forging die cavity as a trimming positioning reference and even further reducing a positioning gap. In the prior art, as disclosed in the patent with publication number CN202825350U, a hub die template processing positioning tool comprises a square base, and further comprises a plurality of cushion blocks, wherein the square base is provided with cushion blocks, the cushion blocks are provided with a plurality of groups of pin hole groups for positioning the hub die template, the distances from the pin holes in each pin hole group to the center of the square base are equal, and the distances from the pin hole groups to the center of the square base are different. The pin hole group is arranged on the cushion block to position, but in the practical application process, the final forging contour positioning is relied on, the positioning accuracy is unstable under the influence of expansion with heat and contraction with cold, the positioning clearance is changed due to temperature fluctuation, and the trimming consistency is poor. Disclosure of Invention Therefore, the invention aims to provide a positioning structure and a positioning method for an intermediate split-die hub, which are used for solving the problems that positioning accuracy is unstable due to the influence of thermal expansion and cold contraction, positioning clearance is changed due to temperature fluctuation, and trimming consistency is poor. Based on the above purpose, the invention provides a positioning structure and a positioning method for an intermediate split die hub, comprising a trimming die and a finish forging die for forming the hub, wherein a positioning boss is arranged in a flash area of the finish forging die, and a V-shaped positioning groove is arranged at a corresponding position of the trimming die; At least four V-shaped positioning grooves are formed in the trimming die and are uniformly distributed along the circumferential direction; the straight edge length of the V-shaped positioning groove is not less than 4mm; A discharging gap is arranged between the positioning boss on the final forging die and the V-shaped positioning groove on the trimming die, and the distance between the discharging gaps is 0.05mm-0.10mm. Preferably, the V angle of the V-shaped positioning groove 8 is 85 ° to 95 °. Preferably, the positioning boss 2 is in a conical structure, and the height of the positioning boss 2 is 1.2mm-1.8mm. Preferably, the outer part of the positioning boss 2 of the final forging die 7 is provided with a wear-resistant coating 6, and the thickness of the wear-resistant coating 6 is 3-5 mu m. Preferably, when the diameter is smaller than a hub with 300mm, the V angle of the positioning boss 2 is 85-90 degrees; When the diameter of the hub is 300-500 mm, the V angle of the positioning boss 2 is 90-95 degrees; When the diameter is larger than 500mm of the hub, the V angle of the positioning boss 2 is 95-100 degrees. The positioning method of the middle split-die hub is applied to the positioning structure of the middle split-die hub and comprises the following steps of: S101, final forging forming, namely preforming a positioning boss in a flash area of a final forging die, monitoring the final forging temperature within a set range, and ensuring that the flash thickness is controlled to be 2.8-3.2mm to form a flash positioning structure embryonic form; s102, transferring the forge piece, namely taking out the hot forge piece with the flash after finish forging, reducing the flash temperature to below 500 ℃ through a cooling system, implementing a fixed-point cooling system after the size is stable, controlling the temperature of a positioning area in a key way, and detecting and recording the temperature after cooling; s103, trimming and positioning, namely placing the forge piece into a trimming die, precisely matching a positioning structure on the flying edge with a corresponding structure on the trimming die to form a gap, calculating an actual working gap according to temperature data, and monitoring the positioning gap in real time by a laser range finder to realize precise positioning in the circumferential direction; S104, finishing trimming under positioning constraint, detecting the profile of the hub af