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CN-122007322-A - Machining device for rotary forging die of automobile steering shaft and using method

CN122007322ACN 122007322 ACN122007322 ACN 122007322ACN-122007322-A

Abstract

The invention relates to the technical field of automobile part rotary forging die processing, in particular to an automobile steering shaft rotary forging die processing device and a using method, wherein the device comprises a machine table, a taking mechanism and a shaping mechanism are respectively arranged at the left end and the right end of the machine table, the taking mechanism is used for grabbing a shaft body workpiece adhered with bio-based lubricating oil, and the shaping mechanism is provided with a die core assembly, and the device is characterized in that: the mold core assembly consists of four mold bodies, and the four mold bodies enclose a plastic cavity for carrying out 360-degree forging pressing on a shaft body workpiece through a molding surface so as to form the steering shaft. According to the invention, through the inner and outer collaborative clamping design of the L-shaped opening and closing clamp and the limiting pressurizing block in the taking mechanism, the bio-based lubricating oil adhered to the surface of the workpiece is uniformly distributed under the action of air flow to form a continuous lubricating film, so that the uniform film forming of the bio-based lubricating oil can not only reduce the friction coefficient between the die and the shaft workpiece, but also inhibit local temperature rise through the action of air flow cooling, and ensure the surface forming quality of the steering shaft of the automobile.

Inventors

  • ZHANG LIYUN

Assignees

  • 上海博芸科技有限公司

Dates

Publication Date
20260512
Application Date
20260319

Claims (10)

  1. 1. The utility model provides an automobile steering shaft rotary forging die processingequipment, includes board (1), is provided with respectively on both ends about board (1) and takes mechanism (4) and mould type mechanism (6), takes mechanism (4) and is used for snatching the adhesion and has the axis body work piece of bio-based lubricating oil, is provided with mold core subassembly (5), its characterized in that on mould type mechanism (6): the die core assembly (5) is composed of four die bodies (51), forming surfaces (52) are formed in the inner walls of the four die bodies (51), and the four die bodies (51) enclose a molding cavity (53) for pressing a shaft body workpiece through 360-degree forging through the forming surfaces (52) to form a steering shaft; The picking mechanism (4) comprises a first driving rotating shaft (41), a group of L-shaped opening and closing clamps (45) and a group of limiting pressurizing blocks (413) are arranged on the first driving rotating shaft (41), the group of L-shaped opening and closing clamps (45) are used for closing and clamping the outer wall of the middle end of the shaft body workpiece, the group of limiting pressurizing blocks (413) are used for expanding and supporting the inner wall of the opening of the shaft body workpiece, and the picking mechanism (4) drives the limiting pressurizing blocks (413) through the first driving rotating shaft (41) to screw the shaft body workpiece into the molding cavity (53) in a clockwise rotation mode; The shaping mechanism (6) comprises a second driving rotating shaft (61) fixedly connected with a load inner cylinder (62) used for internally arranging a mold core assembly (5), an eccentric driver (64) used for driving the four mold bodies (51) to radially open and close and adjust is arranged at the middle end position of the load inner cylinder (62), and a magnetic driver (65) used for driving bio-based lubricating oil to be uniformly coated on a shaft body workpiece is arranged at the left end position of the load inner cylinder (62).
  2. 2. The rotary forging die processing device for the steering shaft of the automobile according to claim 1, wherein a moving bracket (2) for rotatably mounting the first driving rotating shaft (41) is slidably mounted at the left end position of the machine table (1), and an explosion-proof outer cylinder (3) for rotatably mounting the second driving rotating shaft (61) is fixedly mounted at the right end position of the machine table (1).
  3. 3. The device for processing the rotary forging die of the steering shaft of the automobile according to claim 2, wherein the molding surface (52) is composed of a transverse curved surface, a first oblique curved surface and a second oblique curved surface which are sequentially connected, and the opening calibers of the molding cavity (53) corresponding to the transverse curved surface, the first oblique curved surface and the second oblique curved surface are sequentially reduced.
  4. 4. The device for processing the rotary forging die of the steering shaft of the automobile according to claim 3, wherein an arc clamping groove (48) corresponding to the outer wall surface of the workpiece of the shaft body is formed in the end part of the L-shaped opening and closing clamp (45), and the outer wall of the limiting pressurizing block (413) is of an arc surface structure corresponding to the inner wall surface of the workpiece of the shaft body.
  5. 5. The rotary forging die processing device for the steering shaft of the automobile according to claim 4, wherein the second driving rotating shaft (61) corresponds to the first driving rotating shaft (41) coaxially, and the load inner cylinder (62) is concentrically arranged in the explosion-proof outer cylinder (3) through the second driving rotating shaft (61).
  6. 6. The device for processing the rotary forging die of the steering shaft of the automobile according to claim 5, wherein a plurality of guide notches (63) corresponding to the eccentric drivers (64) are formed in the middle end position of the loading inner cylinder (62), and the guide notches (63) are distributed at equal intervals in the circumferential direction.
  7. 7. The device for processing the rotary forging die for the steering shaft of the automobile according to claim 6, wherein the eccentric driver (64) comprises four limiting strips (642) fixedly installed in the inner loading cylinder (62), guide holes (645) for slidably sleeving one die body (51) are formed between two adjacent limiting strips (642), and the die body (51) moves radially along the guide holes (645).
  8. 8. The device for processing the rotary forging die of the steering shaft of the automobile according to claim 7, wherein the magnetic actuator (65) comprises a right-angle cavity (655) arranged at the left end of the limiting strip (642), a three-way cavity (656) which is communicated with the right-angle cavity (655) and the molding cavity (53) in one direction is arranged in the limiting strip (642), and an elastic pressurizing piston (657) is sleeved in an opening at one end of the three-way cavity (656) in a sliding manner.
  9. 9. The device for processing the rotary forging die of the steering shaft of the automobile according to claim 8, wherein the three-way channel (656) is provided with one-way valves at the opening positions of the two ends of the right-angle cavity (655) and the molding cavity (53) which are communicated.
  10. 10. A method of using the automotive steering shaft rotary swaging die processing apparatus of claim 9, comprising the steps of: Step S1, adhering bio-based lubricating oil on a shaft body workpiece; S2, controlling an L-shaped opening and closing clamp (45) to tend to be closed to the left and clamp the outer wall of the middle end of the shaft body workpiece on a first driving rotating shaft (41), driving a limiting pressurizing block (413) to open to expand and press to the right in an opening of the shaft body workpiece, controlling a moving bracket (2) to move to the right and simultaneously controlling the first driving rotating shaft (41) to rotate clockwise, so that the shaft body workpiece spirally enters a molding cavity (53); Step S3, controlling the second driving rotating shaft (61) to rotate anticlockwise, driving the load inner cylinder (62) and the limiting strip (642) to synchronously rotate, namely starting the magneto driver (65) to enable the elastic pressurizing piston (657) to move in a three-way channel (656) in a telescopic manner, so as to pump and exhaust gas in the right-angle cavity (655) into the molding cavity (53) to perform wind power driving on a shaft body workpiece passing through the molding cavity (53), and enabling bio-based lubricating oil to be uniformly distributed on the surface of the shaft body workpiece; And S4, starting an eccentric driver (64) to enable the die body (51) to move radially along the guide hole (645) so as to forge and press the shaft body workpiece uniformly coated with the bio-based lubricating oil by 360 degrees, and molding the shaft body workpiece into a steering shaft by using the transverse curved surface, the first inclined curved surface and the second inclined curved surface.

Description

Machining device for rotary forging die of automobile steering shaft and using method Technical Field The invention relates to the technical field of automobile part rotary forging die processing, in particular to an automobile steering shaft rotary forging die processing device and a using method. Background The rotary forging technology is a precise metal processing technology for applying high-frequency radial forging force to blanks such as bars, pipes and the like to enable the blanks to be molded according to the molded surface of a die, and is widely applied to manufacturing key bearing components such as steering shafts and transmission half shafts of automobiles. In the rotary forging processing process of an automobile steering shaft, a feeding mode and a die structure are core factors influencing the forming quality. In the prior art, as disclosed in CN120551316a, a rigid feeding mode is adopted, and when the forging die is closed, the die bell mouth can block the workpiece from being fed, so that the material flows in the reverse feeding direction, and the countercurrent quantity is greater than the forward flow quantity. The phenomenon leads the axial feeding force and the forging force to be obviously increased, not only reduces the service life of the die, but also is easy to cause the defects of sinking, upsetting, cracking and the like of pipe blanks. Particularly, when the blank with lower strength or hot rotary forging is adopted, the problem of material backflow is more remarkable, and the forming efficiency and the surface quality are directly affected. For a mold structure, such as a hollow shaft rotary forging mold design method disclosed in publication number CN103861987B, although a cooling system is improved, the problem of motion precision during multi-mode cooperative motion is not solved. The existing rotary forging die mostly adopts an integral structure or a simple block design, so that accurate control of radial feeding amount is difficult to realize when a variable cross-section component is processed, and excessive internal and external roundness errors and even folding defects are easily caused. In another example, CN208408425U discloses a steering shaft mold for an automobile, which focuses on mechanical stability of the mold, but in a high-frequency forging process, a friction state between the mold and a workpiece is difficult to maintain stable, and uneven lubrication leads to degradation of surface quality. In addition, the feeding and forging stations of the existing rotary forging equipment are mutually independent, and an active regulation and control means for the lubrication state of the workpiece surface is lacked. The bio-based lubricating oil has the advantage of environmental protection, but is difficult to form a uniform and continuous lubricating film on the surface of a workpiece in the high-speed rotary forging process, so that the forming effect of a high-quality forging piece is severely restricted. For the processing of difficult-to-deform materials for the manufacture of automotive steering axles, existing devices still suffer from significant shortcomings in terms of microstructure control and surface integrity control. Disclosure of Invention The invention aims to solve the problem that in the prior art, the forming quality of an automobile steering shaft is affected by the fact that a shaft body workpiece is difficult to perform rotary forging processing, and provides an automobile steering shaft rotary forging die processing device and a using method. In order to achieve the above purpose, the present invention adopts the following technical scheme: The utility model provides an automobile steering shaft rotary forging die processingequipment, includes the board, is provided with respectively on the board both ends about and takes the mechanism and mould type mechanism, takes the mechanism and is used for snatching the axis body work piece that is adhered with bio-based lubricating oil, mould type mechanism on and be provided with the mold core subassembly: the die core assembly consists of four die bodies, forming surfaces are formed in the inner walls of the four die bodies, and the four die bodies enclose a molding cavity for applying 360-degree forging pressure to a shaft workpiece through the forming surfaces so as to form a steering shaft; The picking mechanism comprises a first driving rotating shaft, a group of L-shaped opening and closing clamps and a group of limiting pressurizing blocks are arranged on the first driving rotating shaft, the group of L-shaped opening and closing clamps are used for closing and clamping the outer wall of the middle end of the shaft body workpiece, the group of limiting pressurizing blocks are used for expanding and supporting the inner wall of the opening of the shaft body workpiece, and the picking mechanism drives the limiting pressurizing blocks through the first driving rotating shaft to spirally conve