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CN-224222639-U - Bolt cold heading forming die

CN224222639UCN 224222639 UCN224222639 UCN 224222639UCN-224222639-U

Abstract

The utility model discloses a mold for cold heading forming of a bolt, which relates to the technical field of cold heading forming of bolts and comprises a main body, a mold splicing unit and a mold stripping unit. The utility model has a reliable die splicing unit, a reliable demolding unit and a hydraulic cylinder, wherein the die splicing unit can push a combined plate to close towards the middle through a threaded shaft, the end parts of six combined plates are mutually attached to enclose a die enclosing block with a regular hexagon structure, a sleeving block is used for sleeving the combined plate and each rod body on the back, the sleeving block is convenient to take down to replace the combined plate with different lengths, so that the heads of bolts with different types and sizes can be molded, the hydraulic cylinder is provided with a reliable demolding unit, the hydraulic cylinder is used for pushing the arc-shaped clamping block to be attached to and abutted against the side surface of a cylinder core, so that the cylinder core is fixed, the follow-up bolt is convenient to separate, and the hydraulic cylinder is used for pushing a top cap to lift in the cylinder core, so that the bolt can be ejected upwards from the die after the bolt is molded.

Inventors

  • BAO ZHENGFANG
  • HE XUCHU

Assignees

  • 常熟市常力紧固件有限公司

Dates

Publication Date
20260512
Application Date
20250416

Claims (6)

  1. 1. The mold for cold heading forming of the bolt is characterized by comprising a main body (1), a mold splicing unit (3) and a demolding unit (4); The main body (1) is of a regular hexagon structure in cross section, and a groove (2) which is hexagonal is formed in the inner side of the upper end of the main body; The die splicing unit (3) comprises a threaded shaft (31), a screwing block (32), a combination plate (33), a sleeving block (34), auxiliary ejector rods (35) and limiting blocks (36), wherein the threaded shaft (31) is connected to the upper position of the middle of each end face on the outer side of the main machine body (1) in a threaded mode, the threaded shaft (31) is perpendicular to the mounting end face, the screwing block (32) is fixedly connected to the outer end of the threaded shaft, six combination plates (33) are arranged in the groove (2), the combination plate (33) is of a long isosceles trapezoid structure, bottom angles on two sides are sixty degrees, three sleeving blocks (34) are fixedly connected to the back of the combination plate (33), one end of the threaded shaft (31) located in the groove (2) is connected to the inside of the sleeving block (34) in a rotating mode, two auxiliary ejector rods (35) are symmetrically distributed on two sides of the threaded shaft (31), one end of each auxiliary ejector rod (35) is propped against in the sleeving block (34) on the back edge side of the combination plate (33), and one end of each auxiliary ejector rod (35) is fixedly connected with the limiting block (36) outwards; The ejector unit (4) is installed at the central part of the inside of the main body (1).
  2. 2. The cold heading forming die for bolts is characterized in that the die splicing unit (3) further comprises pin hole rows (37) and limiting bolts (38), the auxiliary ejector rods (35) are vertically and slidably connected with the side face of the main machine body (1), the pin hole rows (37) are formed in the upper ends of the outer sides of the circumferences of the auxiliary ejector rods (35), the pin hole rows (37) are formed by a row of circular pin holes which are connected in pairs, two circular through holes are formed in the upper end of the main machine body (1) and located at positions corresponding to the positions of each auxiliary ejector rod (35) in the vertical direction, and the limiting bolts (38) penetrate through the two circular through holes and are inserted into the pin hole rows (37).
  3. 3. The cold heading forming die for the bolts is characterized in that the demolding unit (4) comprises a barrel core slot (41) and a barrel core (42), the vertical barrel core slot (41) is formed in the center of the groove (2), and the barrel core (42) is vertically inserted into the barrel core slot (41).
  4. 4. The cold heading forming die for bolts is characterized in that the demolding unit (4) further comprises a second hydraulic cylinder (45), a top cap (46) and a connecting block (47), a cylindrical mounting chamber is formed in the center of the bottom of the main machine body (1), the second hydraulic cylinder (45) is embedded and mounted in the mounting chamber, a circle of connecting blocks (47) are fixedly connected to the side surface circumference array of the second hydraulic cylinder (45), the other end of the connecting blocks (47) is fixedly connected with the inner wall of the mounting chamber, the telescopic end of the second hydraulic cylinder (45) faces upwards vertically and stretches into the barrel core (42), the top cap (46) is screwed on the end portion of the telescopic end in a threaded mode, and the top cap (46) is slidably connected to the barrel core (42).
  5. 5. The cold heading forming die for bolts is characterized in that the demolding unit (4) further comprises first hydraulic cylinders (43) and arc-shaped clamping blocks (44), the first hydraulic cylinders (43) are embedded and arranged on the inner middle sides of all end faces of the main machine body (1), the telescopic ends of the first hydraulic cylinders (43) face the central axis of the cylinder core (42) horizontally, and the arc-shaped clamping blocks (44) are fixedly connected to the end portions of the telescopic ends.
  6. 6. The cold heading forming die for bolts is characterized in that the die splicing unit (3) further comprises distance monitors (39), each distance monitor (39) is installed at the middle position of each section of the upper end of the main machine body (1), the horizontal distance between each distance monitor (39) and the inner wall of the groove (2) is equal, and the transmitting end vertically corresponds to the back of the combined plate (33).

Description

Bolt cold heading forming die Technical Field The utility model relates to the technical field of bolt cold heading forming, in particular to a die for bolt cold heading forming. Background The cold heading process is one of the new processes of few and no cutting metal pressure processing. The plastic deformation of metal under the action of external force is used to redistribute and transfer the volume of metal by means of mould, so forming needed parts or blanks. The cold heading process is most suitable for producing standard fasteners such as bolts, screws, nuts, rivets, pins and the like; In the prior art, the mold for cold heading forming of the bolts is of a fixed structure, each mold can only produce a corresponding bolt, if different types of bolts need to be produced, a new mold needs to be purchased, so that great cost is caused, and the existing mold often does not have a demolding ejection mechanism, so that the whole mold is not practical enough, and therefore, the mold for cold heading forming of the bolts is provided. Disclosure of utility model The utility model aims to overcome the defects of the prior art, and provides a bolt cold heading forming die which is provided with a reliable die splicing unit, a reliable demolding unit and a reliable demolding unit, wherein a first hydraulic cylinder can drive a threaded shaft to rotate, the threaded shaft can push a combined plate to be close to the middle when screwed in, the end parts of six combined plates are mutually attached to form a die enclosing block of a regular hexagon structure, a sleeving block is used for sleeving the combined plates and rod bodies of the back, the combined plates with different inner diameters are conveniently removed to replace the combined plates with different lengths, so that bolt heads with different sizes can be molded, a second hydraulic cylinder can push a top cap to lift the inside the cylinder by pushing the arc-shaped clamping blocks to be attached to the side face of the cylinder, so that the cylinder core is fixed, the bolt can be ejected upwards from the die after the bolt is formed, and the locking of the cylinder core can be relieved after the arc-shaped clamping blocks are released, so that cylinder cores with different inner diameters can be replaced, and the problem of the bolt enclosing block with different inner diameters can be effectively solved in the matched technology. In order to achieve the purpose, the utility model provides the technical scheme that the mold for cold heading forming of the bolt comprises a main body, a mold splicing unit and a mold stripping unit; the main body is of a regular hexagon structure in cross section, and a groove which is hexagonal is formed in the inner side of the upper end of the main body; The die splicing unit comprises a threaded shaft, screwing blocks, combination plates, sleeving blocks, auxiliary ejector rods and limiting blocks, wherein the threaded shaft is connected to the middle of each end face on the outer side of the main machine body in a threaded manner, the threaded shaft is perpendicular to the mounting end face and fixedly connected with the screwing blocks at the outer ends, six combination plates are arranged in the grooves, each combination plate is of a long isosceles trapezoid structure, bottom angles on two sides are sixty degrees, three sleeving blocks are fixedly connected to the back of each combination plate, one end of each threaded shaft positioned in each groove is rotatably connected to the inside of each sleeving block, two auxiliary ejector rods are symmetrically distributed on two sides of each threaded shaft, one end of each auxiliary ejector rod is propped against each sleeving block on the edge side of the back of each combination plate, and each limiting block is fixedly connected to one outward end of each auxiliary ejector rod; And the demolding unit is arranged at the central part of the inside of the main body. The screw thread shaft can be driven to rotate by screwing the screwing block, when the screw thread shaft is screwed in, the combined plates can be pushed to be close to the middle, the end parts of the six combined plates are mutually attached to form a die enclosing block of a regular hexagon structure, the sleeving block is used for sleeving the combined plates and the back rod bodies and is convenient to take down to replace the combined plates with different lengths, so that bolt heads with different types and sizes can be molded, the limiting block is used for limiting the sliding of the auxiliary ejector rod, the auxiliary ejector rod is arranged, the combined plates can be propped up, and thread damage caused by the fact that the expansion pressure of the bolt heads in cold heading molding directly acts on the screw thread shaft is avoided. Further, the die splicing unit further comprises a pin hole row and a limiting bolt, the auxiliary ejector rod is vertically and slidably connected with th