Search

CN-121993503-A - Bearing sleeve extrusion forming device and forming method

CN121993503ACN 121993503 ACN121993503 ACN 121993503ACN-121993503-A

Abstract

The invention discloses a bearing sleeve extrusion forming device and a forming method, which relate to the technical field of joint bearing assembly and comprise a base, wherein the base is provided with a boss, and a telescopic ejector rod is arranged in the boss; the bearing comprises a lower die, a sleeve, an upper die, a circular die and a circular die, wherein a space avoidance cavity is arranged at the first end of the lower die, the inner wall of the space avoidance cavity is in butt joint with the side wall of a boss, a first hemispherical cavity is arranged at the second end of the lower die, a communication cavity is arranged between the space avoidance cavity and the first hemispherical cavity, the inner wall of the sleeve is in butt joint with the side wall of the lower die, the upper die comprises a positioning die and a circular die, the positioning die is used for bearing external axial pressure and extruding a first ball head of a bearing into a first bearing outer ring in cooperation with the first hemispherical cavity, the circular die is used for bearing the external axial pressure and converting the external axial pressure into radial pressure applied to the outer side of the assembled first bearing outer ring, and the first bearing outer ring is enabled to radially shrink and is in contact with the first ball head of the bearing. Through the cooperation of last mould and lower mould, solve one end extrusion one end interference's problem.

Inventors

  • GU JINFANG
  • QI KAILI
  • LU PENGCHENG
  • HE HAITAO

Assignees

  • 上海天安轴承有限公司

Dates

Publication Date
20260508
Application Date
20260403

Claims (10)

  1. 1. The utility model provides a bearing closes a cover extrusion device for double-end knuckle bearing extrusion, its characterized in that includes: The base (7), a boss (71) is arranged at the first end of the base (7), and a telescopic ejector rod (5) is arranged in the boss (71); The lower die (3), a first end of the lower die (3) is provided with a avoidance cavity (31), the inner wall of the avoidance cavity (31) is in butt joint with the side wall of the boss (71), a second end of the lower die (3) is provided with a first hemispherical cavity (32), and a communication cavity (33) capable of accommodating the bearing inner rod is arranged between the avoidance cavity (31) and the first hemispherical cavity (32); a sleeve (4) arranged at a first end of the base (7), wherein the inner wall of the sleeve (4) is in contact with the side wall of the lower die (3); The upper die can be arranged in the sleeve (4) and comprises a positioning die (9) and a circular die (10), wherein the positioning die (9) is used for bearing external axial pressure and is matched with the first hemispherical cavity (32) and the ejector rod (5) to extrude a first ball head of the bearing into a first bearing outer ring, and the circular die (10) is used for bearing external axial pressure and is matched with the first hemispherical cavity (32) to convert the external axial pressure into radial pressure applied to the outer side of the assembled first bearing outer ring so that the first bearing outer ring is radially contracted and is attached to the first ball head of the bearing.
  2. 2. The extrusion molding device for the bearing fit sleeve according to claim 1, wherein a mounting cavity (72) and a limiting cavity (73) are formed in the second end of the base (7), a spring (6) is arranged in the mounting cavity (72), the limiting cavity (73) extends to the first end of the base (7) and penetrates through the boss (71), one end of the ejector rod (5) is abutted with the spring (6), and the other end of the ejector rod penetrates through the limiting cavity (73) and extends into the avoidance cavity (31).
  3. 3. The bearing fit extrusion molding device according to claim 2, wherein the lower mold (3) comprises a first mold half (3 a) and a second mold half (3 b) which are symmetrically arranged, wherein first ends of the first mold half (3 a) and the second mold half (3 b) are abutted to form the avoidance cavity (31), second ends of the first mold half (3 a) and the second mold half (3 b) are abutted to form the first hemispherical cavity (32), and a region between the first end and the second end of the first mold half (3 a) and the second mold half (3 b) is abutted to form the communication cavity (33).
  4. 4. A bearing fit extrusion device according to claim 3, characterized in that the diameter of the first hemispherical cavity (32) is larger than the diameter of the first bearing outer ring, the diameter of the clearance cavity (31) is larger than the diameter of the first bearing outer ring, the diameter of the communication cavity (33) is adapted to the diameter of the bearing inner rod, and the diameter of the ejector rod (5) is adapted to the diameter of the limiting cavity (73).
  5. 5. The bearing fit extrusion molding device according to claim 4, wherein the positioning die (9) is provided with a positioning groove (91) near the end face of the first hemispherical cavity (32), and the positioning groove (91), the communicating cavity (33), the sleeve (4), the boss (71), the limiting cavity (73) and the mounting cavity (72) are coaxially arranged.
  6. 6. The extrusion-forming device of a bearing set according to claim 5, characterized in that when the positioning die (9) is in a state of not bearing external axial pressure, the bearing second ball head is abutted against the ejector rod (5), the first end face of the first bearing outer ring is abutted against the positioning groove (91), and the second end face is abutted against the bearing first ball head; When the positioning die (9) is in a state of continuously bearing external axial pressure, the second ball head of the bearing is abutted to the ejector rod (5) and axially moves towards the direction of the limiting cavity (73), the first end face of the first bearing outer ring is abutted to the positioning groove (91), and the distance between the first ball head of the bearing and the first end face of the first bearing outer ring is gradually reduced until the first ball head of the bearing penetrates through the first bearing outer ring and is abutted to the positioning groove (91).
  7. 7. The bearing fit extrusion molding device according to claim 5, wherein the end surface of the circular mold (10) close to the first hemispherical cavity (32) is provided with a second hemispherical cavity (101), the shape and the size of the second hemispherical cavity (101) are the same as those of the first hemispherical cavity (32), and the second hemispherical cavity (101), the first hemispherical cavity (32) and the communication cavity (33) are all coaxially arranged.
  8. 8. The extrusion molding device for the bearing sleeve according to claim 7, wherein when the circular mold (10) is in a state of not bearing external axial pressure, the second end face of the first bearing outer ring is abutted against the inner wall of the first hemispherical cavity (32), the first end face of the first bearing outer ring is abutted against the inner wall of the second hemispherical cavity (101), and when the circular mold (10) is in a state of continuously bearing external axial pressure, the distance between the end face of the circular mold (10) provided with the second hemispherical cavity (101) and the first end face of the lower mold (3) is gradually reduced until the curvature of the inner wall of the first bearing outer ring is matched with the curvature of the outer spherical surface of the first ball head of the bearing.
  9. 9. The extrusion-molding device for the bearing fit according to claim 1, further comprising a gasket (8), wherein the gasket (8) is disposed at one end of the sleeve (4) away from the base (7) and is sleeved outside the positioning die (9) or the circular die (10).
  10. 10. A method of extrusion of a bearing set, characterized in that a bearing set extrusion device according to any one of claims 1-9 is applied, wherein the lower die (3) comprises a first half-die (3 a) and a second half-die (3 b) arranged symmetrically, the method comprising: S100, mounting a push rod (5) and a spring (6) in a limiting cavity (73) and a mounting cavity (72) respectively from the bottom of a base (7), enabling one end of the push rod (5) to be in butt joint with the spring (6), enabling the other end of the push rod to penetrate through the limiting cavity (73) and extend into a avoidance cavity (31), and horizontally arranging the base (7) below a pressure head of a press assembly; S200, opening a first half mould (3 a) and a second half mould (3 b) and horizontally arranging the first end of a base (7), abutting one ball head of a bearing on the upper surface of a push rod (5), folding the first half mould (3 a) and the second half mould (3 b) to enable an inner rod of the bearing to be positioned in a communicating cavity (33), sleeving a sleeve (4) on the outer sides of the first half mould (3 a) and the second half mould (3 b), and placing a gasket (8) on the upper surface of the sleeve (4); S300, after the first bearing outer ring is horizontally arranged and abutted against the upper part of the first bearing ball, the positioning die (9) is horizontally arranged above the first bearing outer ring, the press assembly is started, the pressing head continuously applies axial pressure to the positioning die (9), so that the first ball head of the bearing is abutted against the positioning groove (91) after being pressed into the first bearing outer ring, and the external axial pressure is removed after pressure is maintained for 20 seconds; S400, replacing the positioning die (9) with a circular die (10), removing the ejector rod (5) and the spring (6), enabling the second hemispherical cavity (101) to be in abutting connection with the first end face of the outer ring of the first bearing, starting the press assembly, continuously applying axial pressure to the circular die (10) by the pressure head until the pressure head reaches a preset pressure value, maintaining the pressure for 20 seconds, and removing external axial pressure; And S500, repeating the operation on the other ball head of the bearing according to the steps S100-S400 to finish extrusion molding of the double-head joint bearing.

Description

Bearing sleeve extrusion forming device and forming method Technical Field The application relates to the technical field of joint bearing assembly, in particular to a bearing sleeve extrusion forming device and a forming method. Background The extrusion type double-head joint bearing is a sliding bearing with a special structure, and as shown in figure 1 of the specification, the extrusion type double-head joint bearing mainly comprises a bearing inner rod 2 with a double-head outer spherical structure, a first bearing outer ring 1 with an inner spherical structure and a second bearing outer ring which has the same structure as the first bearing outer ring 1. The device is used for a vehicle transmission system, is connected with a speed reducer driving shaft and a hub, and mainly plays roles of traction, connection, deflection and the like. In the use process, the two ends are required to rotate, the requirement of certain deflection function in the radial direction can be met, and the device has higher stability and reliability. At present, in the conventional extrusion type knuckle bearing assembly process, through inner hole positioning, the symmetry is ensured by using an upper die and a lower die to carry out double-sided extrusion. However, for the double-head extrusion bearing, the positioning mode needs to be considered under the condition of removing extrusion interference at one end, so that the coaxiality and symmetry of the outer ring and the inner rod after the bearing is extruded are ensured. Therefore, how to provide a bearing sleeve extrusion molding device and a molding method is an urgent problem to be solved in the prior art. Disclosure of Invention The application aims to provide a bearing sleeve extrusion forming device and a forming method, which solve the problem of interference of one end of a bearing double-end extrusion sleeve in the prior art, so as to ensure that the coaxiality and symmetry of an outer ring and an inner rod of a bearing meet the product requirement. In order to achieve the above purpose, the present application provides the following technical solutions: in a first aspect, a bearing fit extrusion device for extrusion of a double-ended knuckle bearing, comprising: The base is provided with a boss at the first end, and a telescopic ejector rod is arranged in the boss; The bearing comprises a boss, a lower die, a bearing inner rod, a lower die and a lower die, wherein a first end of the lower die is provided with a avoidance cavity, and the inner wall of the avoidance cavity is in butt joint with the side wall of the boss; a sleeve arranged at the first end of the base, wherein the inner wall of the sleeve is in contact with the side wall of the lower die; The upper die can be arranged in the sleeve and comprises a positioning die and a circular die, wherein the positioning die is used for bearing external axial pressure and is matched with the first hemispherical cavity and the ejector rod to extrude the first ball head of the bearing into the first bearing outer ring, and the circular die is used for bearing external axial pressure and is matched with the first hemispherical cavity to convert the external axial pressure into radial pressure applied to the outer side of the assembled first bearing outer ring, so that the first bearing outer ring radially contracts and is attached to the first ball head of the bearing. In some embodiments, the second end of the base is provided with a mounting cavity and a limiting cavity, a spring is arranged in the mounting cavity, the limiting cavity extends to the first end of the base and penetrates through the boss, one end of the ejector rod is abutted with the spring, and the other end of the ejector rod penetrates through the limiting cavity and extends into the avoidance cavity. In some embodiments, the lower die comprises a first half die and a second half die which are symmetrically arranged, wherein first ends of the first half die and the second half die are abutted to form the avoidance cavity, second ends of the first half die and the second half die are abutted to form the first half ball cavity, and a region between the first half die and the first end and the second end of the second half die is abutted to form the communication cavity. In some embodiments, the diameter of the first hemispherical cavity is larger than the diameter of the first bearing outer ring, the diameter of the avoidance cavity is larger than the diameter of the first bearing outer ring, the diameter of the communication cavity is matched with the diameter of the bearing inner rod, and the diameter of the ejector rod is matched with the diameter of the limit cavity. In some embodiments, the positioning die is provided with a positioning groove near the end face of the first hemispherical cavity, and the positioning groove, the communication cavity, the sleeve, the boss, the limiting cavity and the mounting cavity are all coaxially arranged.