CN-224209056-U - Hydraulic locking mechanism of die holder

Abstract

The application relates to a die holder hydraulic locking mechanism which comprises a first locking oil cylinder, a bottom plate, a first wedge block and a second wedge block which is opposite to the first wedge block, wherein the bottom plate is detachably arranged on a machine body of a cold header, a locking groove is formed in the bottom plate, the second wedge block is detachably arranged at the bottom of the die holder, and the first wedge block and the second wedge block are accommodated in the locking groove. According to the hydraulic locking mechanism of the die holder, the first wedge-shaped block is driven by the first locking oil cylinder to be wedged with the second wedge-shaped block arranged at the bottom of the die holder in the bottom plate locking groove, the structures such as the base plate mounting part, the limiting bulge and the clamping groove are combined for precisely controlling and matching, and the two ends of the die holder can be matched for locking, so that the locking reliability, the positioning precision and the integral rigidity of the die holder are improved, the cold heading processing stability is ensured, and the quick die change is facilitated.

Inventors

• ZHU JUNXIAO

Assignees

• 宁波天相机械制造有限公司

Dates

Publication Date

20260508

Application Date

20250530

Claims (7)

1. 1. The die holder hydraulic locking mechanism is applied to a cold header and is characterized by comprising a first locking oil cylinder, a bottom plate, a first wedge block and a second wedge block which is opposite to the first wedge block, wherein the bottom plate is detachably arranged on a machine body of the cold header, a locking groove is formed in the bottom plate, the second wedge block is detachably arranged at the bottom of the die holder, the first wedge block and the second wedge block are accommodated in the locking groove, the side faces of the first wedge block and the second wedge block, which are away from each other, are respectively in contact with different inner groove walls of the locking groove, the first locking oil cylinder is fixedly arranged on the machine body of the cold header, a piston rod of the first locking oil cylinder extends into the locking groove and is fixedly connected with the first wedge block, the piston rod is used for driving the first wedge block to move between a locking position and a releasing position in the locking groove, the side faces of the first wedge block and the second wedge block are in contact with each other, and the side faces of the second wedge block are in contact with each other, and form a clearance between the first wedge block and the second wedge block.
2. 2. The die holder hydraulic locking mechanism according to claim 1, wherein a backing plate is fixedly mounted on the front side of the die holder, a mounting portion is provided on the bottom edge of the backing plate in a protruding manner, a notch is provided on the bottom plate at the edge of one side facing the mounting portion, and the notch cooperates with the mounting portion to define the locking groove together.
3. 3. The hydraulic die holder locking mechanism according to claim 2, wherein a plurality of limiting protrusions are convexly arranged on one side, facing the bottom plate, of the mounting portion, the limiting protrusions vertically extend and are distributed at intervals along the axial direction of the piston rod of the first locking cylinder, and clamping grooves matched with the limiting protrusions are formed in the second wedge-shaped blocks.
4. 4. The hydraulic locking mechanism of the die holder of claim 2, wherein the upper plate surface of the bottom plate is provided with a wedge cover plate, the wedge cover plate covers the top side opening of the notch, the bottom of the die holder is provided with a positioning groove corresponding to the wedge cover plate, and the wedge cover plate is suitable for being accommodated in the positioning groove.
5. 5. The die holder hydraulic locking mechanism according to any one of claims 1 to 4, wherein an axial direction of a piston rod of the first locking cylinder is parallel to a length direction of the die holder.
6. 6. The hydraulic locking mechanism of a die holder according to claim 5, further comprising two oppositely arranged third wedge blocks and two second locking cylinders respectively driving the two third wedge blocks to move, wherein the second locking cylinders are fixedly arranged on a machine body of the cold header, wedge faces are respectively arranged at two ends of the die holder in the length direction, and each wedge face is suitable for being respectively in locking fit with one third wedge block.
7. 7. The hydraulic die holder locking mechanism according to claim 6, wherein the locking fit of the third wedge block with the wedge surface is that a wedge groove is formed between the wedge surface and the machine body of the cold header, and the third wedge block is accommodated in the wedge groove and is matched with the wedge surface under the driving of the second locking cylinder to realize locking.

Description

Hydraulic locking mechanism of die holder Technical Field The application relates to the technical field of cold heading machines, in particular to a die holder hydraulic locking mechanism. Background In the prior art, a cold header is a key device widely applied in the field of metal plastic forming, and applies strong impact force or pressure to a metal blank through a die to enable the metal blank to be subjected to plastic deformation, so that a part with a required shape and size is obtained. In the cold heading process, the die holder (or die fixing seat) is used as a core component for bearing and fixing the die, and the stability of installation, the reliability of locking and the convenience of replacement directly influence the precision of cold heading processing, the service life of the die, the production efficiency and the safety of equipment. In order to firmly install the die holder on the machine body of the cold header and bear huge working load, the locking mode of the die holder is mainly mechanical modes such as bolt fastening or manual wedge pressing. For example, the die holder is directly fixed on the machine body through a plurality of high-strength bolts, bolts are needed to be loosened one by one or wedge blocks are needed to be adjusted when the die is replaced, the operation is complex, the time consumption is long, the required locking force for the large cold header is huge, and the enough and consistent locking force is difficult to ensure by manual operation. Disclosure of utility model In order to solve the problems, the application provides a die holder hydraulic locking mechanism which is beneficial to quick die changing. The die holder hydraulic locking mechanism comprises a first locking oil cylinder, a bottom plate, a first wedge block and a second wedge block which is opposite to the first wedge block, wherein the bottom plate is detachably arranged on a machine body of the cold header, a locking groove is formed in the bottom plate, the second wedge block is detachably arranged at the bottom of the die holder, the first wedge block and the second wedge block are accommodated in the locking groove, the side faces of the first wedge block and the second wedge block, which are away from each other, are respectively in contact with different inner groove walls of the locking groove, the first locking oil cylinder is fixedly arranged on the machine body of the cold header, a piston rod of the first locking oil cylinder extends into the locking groove to be fixedly connected with the first wedge block and is used for driving the first wedge block to move between a locking position and a releasing position in the locking groove, the side faces of the first wedge block and the second wedge block are in contact with each other, and the side faces of the second wedge block, which are away from each other, are in contact with each other, form a clearance between the first wedge block and the second wedge block, and the clearance is formed between the two wedge blocks. Preferably, a backing plate is fixedly installed on the front side of the die holder, a mounting part is convexly arranged on the bottom edge of the backing plate, a notch is formed in the edge of one side of the base plate, which faces the mounting part, and the notch is matched with the mounting part to jointly define the locking groove. Preferably, the mounting part is provided with a plurality of limiting protrusions protruding towards one side of the bottom plate, the limiting protrusions vertically extend and are distributed at intervals along the axial direction of the piston rod of the first locking oil cylinder, and the second wedge-shaped block is provided with clamping grooves matched with the limiting protrusions. Preferably, the upper plate surface of the bottom plate is provided with a wedge cover plate, the wedge cover plate covers the top side opening of the notch, the bottom of the die holder is provided with a positioning groove corresponding to the wedge cover plate, and the wedge cover plate is suitable for being accommodated in the positioning groove. Preferably, the axial direction of the piston rod of the first locking oil cylinder is parallel to the length direction of the die holder. Preferably, the cold header further comprises two oppositely arranged third wedge blocks and two second locking oil cylinders which respectively drive the two third wedge blocks to move, wherein the second locking oil cylinders are fixedly arranged on a machine body of the cold header, wedge faces are respectively arranged at two ends of the length direction of the die holder, and each wedge face is suitable for being respectively in locking fit with one third wedge block. Preferably, the locking fit of the third wedge block and the wedge surface is that a wedge groove is formed between the wedge surface and the machine body of the cold header, and the third wedge block is accommodated in the wedge groove and