Cutter clamping assembly with sealing performance

Abstract

A cutter clamping assembly with sealing performance comprises a cutter handle, an elastic chuck and a cover cap, the elastic chuck and the cover cap are arranged at the front end of the cutter handle, the rear end of the elastic chuck is inserted into the cutter handle, and the cover cap is arranged at the front end of the cutter handle in a sleeving mode and presses the front end of the elastic chuck so that the elastic chuck can contract in the radial direction. A first step face is arranged on the outer side wall of the cutter handle, the front end of the sealing ring abuts against the rear end of the cap to form interference fit, the rear end of the sealing ring abuts against the cutter handle to form interference fit, and the inner side wall of the sealing ring and the first step face form interference fit. When the cap axially extrudes the sealing ring, the sealing ring deforms in the radial direction, the front end of the sealing ring abuts against the rear end of the cap to form interference fit, the rear end of the sealing ring abuts against the cutter handle to form interference fit, the inner side wall of the sealing ring and the first step face form interference fit, and at the moment, the sealing ring is in a tensioning state. A good sealing effect is formed after the knife handle and the cap are assembled, and the water stopping and slag preventing functions are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the cutter field especially a cutter clamping subassembly with sealing. BACKGROUND

[0002] At present, in the field of numerical control machine tool processing, the cutter clamping subassembly used in the market is generally composed of a tool shank body, an elastic chuck and a cap, the cutter is inserted into the elastic chuck, the elastic chuck with the cutter is installed in the cap, then the tool shank is installed and the cap is tightened to make the elastic chuck clamp the cutter, and after the combination is completed, the end of the tool shank is aligned with the mounting hole on the main shaft of the numerical control machine tool and is inserted for use.

[0003] For example, Chinese invention CN111151778A discloses a kind of anti-loose cutter clamping subassembly, and high efficiency low cost solves the problem that cap appears loose due to vibration, but in actual use process, the chip that is milled can be discharged through the chip groove on the cutter, and the discharged chip will be accumulated at the connecting part between tool shank and nut, the sealing ring for preventing water and slag is provided in the above-mentioned cutter clamping subassembly, and the tool shank realizes sealing by being radially abutted with the cap.

[0004] However, the size of the sealing ring is difficult to accurately grasp, if the width of the sealing ring is too large, the tool shank and the cap will be difficult to install and fasten, and if the width of the sealing ring is too small, the sealing effect between the tool shank and the cap will be not good and water and slag will easily leak. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to design a cutter clamping subassembly with sealing, without accurately grasping the size of the sealing ring, the tool shank and the cap can form good sealing effect after assembly, realizing the functions of water stopping and slag prevention.

[0006] To achieve the above-mentioned purpose, the utility model provides a cutter clamping subassembly with sealing, comprising: a tool shank, an elastic chuck and a cap installed at the front end of the tool shank, the rear end of the elastic chuck is inserted into the tool shank, the cap is sleeved on the front end of the tool shank and presses the front end of the elastic chuck to make the elastic chuck shrink radially, the cutter clamping subassembly further comprises a sealing ring with elasticity, the outer side wall of the tool shank is provided with a first step surface, the front end of the sealing ring abuts against the rear end of the cap to form an interference fit, the rear end of the sealing ring abuts against the tool shank to form an interference fit, and the inner side wall of the sealing ring forms an interference fit with the first step surface.

[0007] Further, the cutter clamping subassembly further comprises a positioning ring, the outer side wall of the tool shank is provided with a second step surface, the second step surface is adjacent to the rear end of the first step surface, the rear end of the positioning ring is sleeved on the second step surface, and the front end of the positioning ring is sleeved on the rear end of the sealing ring.

[0008] Further, the outer side wall of the front end of the shank is provided with external threads, and the inner side wall of the cap is provided with internal threads which are screwed with the external threads.

[0009] Further, the cap is provided with a abutting convex part in front of the internal threads, which abuts against the outer side wall in front of the external threads of the shank.

[0010] Further, the positioning ring is a metal piece.

[0011] Further, the sealing ring is a polytetrafluoroethylene sealing ring, and the front end of the sealing ring is provided with a groove, and the rear end face of the cap is located in the groove.

[0012] After the above technical scheme is adopted, the beneficial effects are as follows: the front end of the sealing ring abuts against the rear end of the cap, the rear end of the sealing ring abuts against the first step face of the shank, when the cap axially extrudes the sealing ring, the sealing ring deforms along the radial direction, the front end of the sealing ring abuts against the rear end of the cap to form an interference fit, the rear end of the sealing ring abuts against the shank to form an interference fit, and the inner side wall of the sealing ring forms an interference fit with the first step face, at this time, the sealing ring is in a tension state, the size of the sealing ring does not need to be accurately grasped, and the shank and the cap can be assembled to form a good sealing effect, and the functions of water stopping and slag preventing are realized. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is an exploded view of the tool clamping assembly;

[0014] Fig. 2 It is a structural schematic view of the tool clamping assembly;

[0015] Fig. 3 It is a right view of the tool clamping assembly;

[0016] The reference signs are as follows: 1, shank; 2, elastic chuck; 3, cap; 4, sealing ring; 5, positioning ring; 6, first step face; 7, second step face; 8, external threads; 9, internal threads; 10, abutting convex part; 11, groove. DETAILED DESCRIPTION

[0017] As Figs. 1-3The utility model provides a tool holder assembly with sealing property, comprising: a tool shank 1, an elastic chuck 2 and a cap 3 installed at the front end of the tool shank 1, the rear end of the elastic chuck 2 is inserted into the tool shank 1, the cap 3 is sleeved on the front end of the tool shank 1 and compresses the front end of the elastic chuck 2 to make the elastic chuck 2 contract along the radial direction, the tool holder assembly further comprises a sealing ring 4 with elasticity, the outer side wall of the tool shank 1 is provided with a first step surface 6, the front end of the sealing ring 4 abuts against the rear end of the cap 3 to form an interference fit, the rear end of the sealing ring 4 abuts against the tool shank 1 to form an interference fit, and the inner side wall of the sealing ring 4 forms an interference fit with the first step surface 6.When the tool shank 1 and the cap 3 are sleeved, the cap 3 compresses the sealing ring 4 along the axial direction, the front and rear ends of the sealing ring 4 are respectively extruded by the cap 3 and the tool shank 1 to generate radial deformation, the counter-tension of the sealing ring 4 is uniformly applied between the cap 3 and the tool shank 1, the front end of the sealing ring 4 abuts against the rear end of the cap 3 to form an interference fit, the rear end of the sealing ring 4 abuts against the tool shank 1 to form an interference fit, and the inner side wall of the sealing ring 4 forms an interference fit with the first step surface 6, so that the sealing ring 4 is in a uniform tension state, thereby forming a sealing structure between the sealing ring 4, the tool shank 1 and the cap 3. Since the above structure forms a seal through axial extrusion, the size of the sealing ring 4 does not need to be accurately controlled, so that the tool shank 1 and the cap 3 can be assembled to form a good sealing effect after assembly, thereby achieving the functions of water stopping and slag prevention.

[0018] The tool holder assembly further comprises a positioning ring 5, the outer side wall of the tool shank 1 is further provided with a second step surface 7, the second step surface 7 is adjacent to the rear end of the first step surface 6, the rear end of the positioning ring 5 is sleeved on the second step surface 6, and the front end of the positioning ring 5 is sleeved on the rear end of the sealing ring 4. When the cap 3 compresses the sealing ring 4 along the axial direction, the front and rear ends of the sealing ring 4 are respectively extruded by the cap 3 and the tool shank 1 to generate radial deformation, the outer side wall of the sealing ring 4 abuts against the inner side wall of the positioning ring 5 to form an interference fit, thereby enhancing the sealing property.

[0019] The outer side wall of the front end of the tool shank 1 is provided with an external thread 8, and the inner side wall of the cap 3 is provided with an internal thread 9 screwed with the external thread 8. The tool shank 1 and the cap 3 are screwed and fastened, the front and rear ends of the sealing ring 4 can stably obtain the axial extrusion force from the tool shank 1 and the cap 3, so that the sealing ring 4 is in a stable tension state, thereby further enhancing the sealing property.

[0020] The cap 3 is provided with a pressing convex part 10 located in front of the internal thread 9, and the pressing convex part 10 abuts against the outer side wall in front of the tool shank external thread 8. The pressing convex part 10 of the inner side wall of the cap 3 will abut against the outer side wall of the tool shank 1 and form an interference fit, so that the tension force is generated between the cap 3 and the tool shank 1, the cap 3 and the tool shank 1 are not easy to loosen, the tool shank 1 and the cap 3 can be tightly fastened, thereby obtaining a stable sealing structure.

[0021] Among them, the positioning ring 5 is a metal part. Metal has high hardness and is not easily deformed. When the cap 3 axially compresses the sealing ring, the metal positioning ring, which is not easily deformed, can stably compress the sealing ring 4 radially, thereby keeping the sealing ring 4 in a stable tension state and achieving a stable effect.

[0022] In this invention, the sealing ring 4 is a polytetrafluoroethylene (PTFE) sealing ring, with a groove 11 at its front end, and the rear end face of the cap 3 located within the groove 11. The groove 11 encloses the rear end of the cap 3, ensuring a sufficient interference fit between the sealing ring 4 and the cap 3. PTFE has high-temperature resistance; during milling, the cutting tool generates a large amount of heat, and PTFE remains stable even in high-temperature environments. In other embodiments, a nitrile rubber (NBR) sealing ring, which also possesses high-temperature resistance, can be used.

Claims

1. A tool clamping assembly with sealing properties, comprising: The tool holder includes a flexible collet and a cap mounted on its front end. The rear end of the flexible collet is inserted into the tool holder, and the cap is fitted onto the front end of the tool holder and presses against the front end of the flexible collet, causing the flexible collet to contract radially. The tool holder also includes an elastic sealing ring. The outer wall of the tool holder has a first stepped surface. The front end of the sealing ring abuts against the rear end of the cap to form an interference fit, and the rear end of the sealing ring abuts against the tool holder to form an interference fit. The inner wall of the sealing ring forms an interference fit with the first stepped surface. The tool clamping assembly also includes a positioning ring. The outer wall of the tool holder has a second stepped surface adjacent to the rear end of the first stepped surface. The rear end of the positioning ring is fitted onto the second stepped surface, and the front end of the positioning ring is fitted onto the rear end of the sealing ring. The front end of the sealing ring has a groove, and the rear end of the cap is located within the groove.

2. The tool clamping assembly with sealing performance according to claim 1, characterized in that, The outer side wall of the front end of the knife handle is provided with an external thread, and the inner side wall of the cap is provided with an internal thread that is screwed into the external thread.

3. A tool clamping assembly with sealing performance according to claim 2, characterized in that, The cap has a pressing protrusion located in front of the internal thread, which abuts against the outer side wall in front of the external thread of the tool holder.

4. A tool clamping assembly with sealing performance according to claim 1, characterized in that, The positioning ring is a metal part.

5. A tool clamping assembly with sealing performance according to claim 1, characterized in that, The sealing ring is a polytetrafluoroethylene (PTFE) sealing ring.

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