Cutter clamping device with limiting structure

Abstract

The utility model discloses a cutter clamping device with a limiting structure, which comprises a cutter holder and a clamping handle, the cutter holder and the clamping handle are in sliding fit along the axial direction, a side fixed cutter is fixed on the cutter holder, a fixed clamping sleeve is rotatably arranged on the outer side of the cutter holder, a limiting block is arranged on the fixed clamping sleeve, a spring is arranged between the cutter holder and the clamping handle, and the limiting block is arranged on the limiting block. A mounting cavity is formed in the clamping handle diameter, the end of the tool apron enters the mounting cavity, a spring is placed in the mounting cavity, a limiting shaft is arranged on the tool apron in the radial direction, the middle of the limiting shaft is fixed in a through hole of the tool apron, and the two ends of the limiting shaft are arranged in limiting grooves in the side wall of the clamping handle diameter respectively. According to the utility model, the limiting shaft and the limiting groove are arranged, so that the tool apron can be prevented from going deep into the diameter of the clamping handle to excessively compress the spring and damage the spring, and the clamping device is simple in structure and easy to operate.

Description

Technical Field

[0001] This utility model relates to the field of machine tool equipment technology, specifically to a tool clamping device with a limit structure. Background Technology

[0002] Chinese invention patent CN113547360B, authorized by publication number CN113547360B, provides a tool clamping device for automatically limiting machining depth, including a clamping shank diameter, a spring connecting sleeve, a spring ring, an external threaded sleeve, a nut, a bearing, a fixed ferrule, a limiting block, and a side-fixed tool. The external threaded sleeve is engaged with the clamping shank diameter, and the spring connecting sleeve movably connects the clamping shank diameter to the external threaded sleeve. The spring ring is located between the clamping shank diameter and the external threaded sleeve and is situated within the spring connecting sleeve. The open end of the external threaded sleeve has a protrusion. The bearing is sleeved on the external threaded sleeve. The nut is threaded onto the outer wall of the external threaded sleeve. The fixed ferrule is engaged with the outer wall of the bearing. The side-fixed tool is fixedly clamped within the external threaded sleeve. The limiting block is located at the end of the fixed ferrule and is arranged in several groups evenly on the outer side of the engagement groove. The clamping shank diameter is connected to the spindle of a machine tool. The rotation of the spindle drives the rotation of the clamping shank. Due to the sliding engagement of the first and second concave-convex parts, the rotation of the clamping shank drives the external threaded sleeve to rotate, which in turn drives the side-fixed tool to rotate, thus processing the product. When the set processing depth is reached, the machine tool spindle cannot stop in time to approach the product. At this time, the limiting block will press against the product surface. Since the fixed sleeve and the clamping shank are connected by a bearing, the side-fixed tool can continue to rotate when the limiting block presses against the product. At the same time, under the action of the reaction force, the fixed sleeve drives the external threaded sleeve to move towards the clamping shank, compressing the spring ring and providing the buffer space required for the machine tool control response time. This allows products with different deformation amounts to maintain the same depth dimension after processing. The above patent has the following defects: the structure is complex and requires multiple parts to be threaded together for installation, making the operation complicated. The spring ring lacks a limiting structure during compression, which can easily cause over-compression and damage to the spring ring. Utility Model Content

[0003] The purpose of this utility model is to provide a tool clamping device with a limiting structure to solve the problems mentioned in the background art, such as the lack of a limiting structure during the compression of springs (e.g., spring coils), the easy over-compression and damage of spring coils, the complex structure requiring multiple threaded parts for installation, and the complicated operation.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a tool clamping device with a limiting structure, comprising a tool holder and a clamping shank diameter, the tool holder and the clamping shank diameter being axially slidably fitted, a side-fixed tool being fixed on the tool holder, a rotatably mounted fixing sleeve being provided on the outer side of the tool holder, a limiting block being provided on the fixing sleeve, a spring being provided between the tool holder and the clamping shank diameter, an installation cavity being provided inside the clamping shank diameter, the end of the tool holder entering the installation cavity, and the spring being placed inside the installation cavity; a limiting shaft being provided on the tool holder and radially positioned, the middle part of the limiting shaft being fixed in the through hole of the tool holder, and the two ends of the limiting shaft being respectively provided in limiting grooves on the side wall of the clamping shank diameter, the limiting shaft being slidably fitted with the limiting grooves and being able to slide along the limiting grooves.

[0005] Preferably, a protective bushing is provided on the clamping handle diameter on the outer side of the limiting groove.

[0006] Preferably, the ends of the defining block are provided with a coating.

[0007] Preferably, the limiting block is provided in multiple blocks symmetrically arranged with the center of the fixing sleeve as the center.

[0008] Preferably, the root of the side-fixing cutter is fixed to the cutter holder by a set screw, and the cutter head of the side-fixing cutter extends outward through the mounting hole at the end of the fixing sleeve.

[0009] Preferably, an adjusting nut is provided at the bottom of the clamping shank, and the end of the adjusting nut contacts the end of the spring.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This utility model employs a limiting shaft and a limiting groove. When the tool holder moves towards the clamping shank diameter, the limiting shaft slides within the limiting groove. The limiting groove restricts the range of movement of the tool holder along the clamping shank diameter. This not only completes the sliding connection between the tool holder and the clamping shank diameter but also prevents the tool holder from excessively compressing the spring and causing damage when it delves deep into the clamping shank diameter. Furthermore, when the clamping shank diameter rotates, the limiting shaft drives the tool holder and the side-fixed tool on the tool holder to rotate. The structure is simple and easy to operate.

[0012] An adjusting nut is located behind the spring. Tightening it inwards compresses the spring, increasing its initial force. Tightening it outwards releases the spring, decreasing its initial force. Because the axial force varies depending on the diameter of the cutting tool, if the spring force is too low, the tool cannot cut into the workpiece and will simply compress the spring and retract. If the spring force is too high, the limiting block will press a dent into the workpiece's surface.

[0013] The ends of the limiting block are coated to prevent scratches on the workpiece surface when the limiting block presses against the workpiece. Attached Figure Description

[0014] Figure 1This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a structural diagram of the installation of the limiting shaft and the limiting groove in this utility model;

[0016] Figure 3 This is a front view of the present utility model;

[0017] Figure 4 for Figure 3 Sectional view along the AA direction;

[0018] Figure 5 for Figure 3 Sectional view along the BB direction.

[0019] In the above figures, the tool holder is 1, the clamping shank diameter is 2, the fixing sleeve is 3, the limiting block is 4, the spring is 5, the side-fixed tool is 6, the limiting shaft is 7, the limiting groove is 8, the protective bushing is 9, the coating is 10, the set screw is 11, the adjusting nut is 12, the bearing is 13, the conical set screw is 14, and the limiting nut is 15. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] like Figure 1-5As shown, a tool clamping device with a limiting structure includes a tool holder 1 and a clamping shank 2. The tool holder 1 and the clamping shank 2 are axially slidingly fitted. A side-fixed tool 6 is fixed on the tool holder 1. A rotatably mounted fixing sleeve 3 is provided on the outside of the tool holder 1. A limiting block 4 is provided on the fixing sleeve 3. A spring 5 is provided between the tool holder 1 and the clamping shank 2 to complete the clamping of the side-fixed tool 6. Then, the clamping shank 2 is connected to the spindle of the machine tool. The rotation of the spindle drives the clamping shank 2 to rotate. The rotation of the clamping shank 2 drives the tool holder 1 and the side-fixed tool 6 fixed on the base to rotate, thus processing the product. When the set processing depth is reached, the machine tool spindle cannot stop in time to approach the product. At this time, the limiting block 4 will press against the product surface. Because the fixing sleeve 3 and the tool holder 1 are rotatably connected, when the limiting block 4 presses against the product, the side-fixed tool 6 can continue to rotate. At the same time, the reaction force drives the tool holder 1 to move towards the clamping shank 2, compressing the spring 5 and providing the buffer required for the machine tool control response time. The punching space allows products with different deformation amounts to maintain consistent depth dimensions after processing. In this invention, a mounting cavity is provided within the clamping shank diameter 2, and a spring 5 is placed within this cavity. The spring 5 is a straight spring, which buffers the relative movement between the tool holder 1 and the clamping shank diameter 2. A limit shaft 7 is provided on the tool holder 1, arranged radially. The middle part of the limit shaft 7 is fixed within the through hole of the tool holder 1, and both ends of the limit shaft 7 are respectively located in limit grooves 8 on the side wall of the clamping shank diameter 2. The positioning shaft 7 and the limiting groove 8 are slidably engaged and can slide along the limiting groove 8. When the tool holder 1 moves in the direction of the clamping shank diameter 2, the limiting shaft 7 slides in the limiting groove 8. The limiting groove 8 restricts the range of movement of the tool holder 1 in the direction of the clamping shank diameter 2. This can not only complete the sliding connection between the tool holder 1 and the clamping shank diameter 2, but also prevent the tool holder 1 from going deep into the clamping shank diameter 2 and causing excessive compression of the spring 5, resulting in damage. Furthermore, when the clamping shank diameter 2 rotates, the limiting shaft 7 drives the tool holder 1 and the side-fixed tool 6 on the tool holder 1 to rotate.

[0022] In this utility model, a protective bushing 9 is provided on the clamping handle diameter 2 outside the limiting groove 8 to protect the limiting groove 8 and the end of the limiting shaft 7 inside the limiting groove 8, preventing oil, dust and other contaminants from entering.

[0023] In this invention, the end of the limiting block 4 is provided with a coating 10, which is treated by dip coating or vapor deposition coating to protect the product surface that comes into contact with the end of the limiting block 4.

[0024] In this utility model, multiple limiting blocks 4 are arranged symmetrically with the middle of the fixing sleeve 3 as the center, and multiple sets of limiting blocks 4 act on the product surface at the same time.

[0025] The root of the side-fixed cutter 6 is fixed to the cutter holder 1 by the set screw 11. The cutter head of the side-fixed cutter 6 extends outward through the mounting hole at the end of the fixing sleeve 3. The installation and removal of the side-fixed cutter 6 and the cutter holder 1 are completed by the set screw 11.

[0026] In this invention, an adjusting nut 12 is provided at the bottom of the clamping shank diameter 2, and the end of the adjusting nut 12 contacts the end of the spring 5. Tightening the adjusting nut 12 inward compresses the spring 5, increasing its force; tightening the adjusting nut 12 outward releases the spring 5, decreasing its force. This allows for adjustment of the spring force of the spring 5 to accommodate different cutting forces of tools with different diameters.

[0027] In this utility model, the tool holder 1 and the fixed sleeve 3 are rotatably installed. Specifically, the fixed sleeve 3 and the limiting block 4 are integrally formed. A bearing 13 is provided between the tool holder 1 and the fixed sleeve 3. The inner diameter of the bearing 13 matches the tool holder 1. The inner side of the bearing 13 is fixed to the tool holder 1 by a limiting nut 15. The inner ring of the bearing 13 is pressed against the shoulder of the tool holder. The outer diameter of the bearing 13 matches the limiting block 4. The outer ring of the bearing 13 is restricted in the groove on the inner side of the fixed sleeve 3 by a tapered set screw 14. After tightening the tapered set screw 14, the limiting block 4 is prevented from falling off the outer diameter of the bearing 13.

Claims

1. A tool clamping device with a limiting structure, characterized in that, It includes a tool holder and a clamping shank, which slide in axial direction. The tool is fixed on the tool holder. A rotatable retaining sleeve is provided on the outside of the tool holder. A limiting block is provided on the retaining sleeve. A spring is provided between the tool holder and the clamping shank. A mounting cavity is provided inside the clamping shank. The end of the tool holder enters the mounting cavity and the spring is placed in the mounting cavity. A limit shaft is provided on the tool holder in a radial direction. The middle part of the limit shaft is fixed in the through hole of the tool holder. The two ends of the limit shaft are respectively provided in the limit grooves on the side wall of the clamping shank. The limit shaft slides in the limit groove and can slide along the limit groove.

2. The tool clamping device with a limiting structure according to claim 1, characterized in that, A protective bushing is provided on the clamping handle diameter on the outside of the limiting groove.

3. The tool clamping device with a limiting structure according to claim 1, characterized in that, The ends of the limiting block are coated.

4. A tool clamping device with a limiting structure according to claim 3, characterized in that, The limiting block is set with multiple blocks arranged symmetrically around the center of the fixed sleeve in a circle.

5. A tool clamping device with a limiting structure according to claim 1, characterized in that, The root of the side-fixing cutter is fixed to the cutter holder by a set screw, and the cutter head of the side-fixing cutter extends outward through the mounting hole at the end of the fixing sleeve.

6. A tool clamping device with a limiting structure according to claim 1, characterized in that, An adjusting nut is provided at the bottom of the clamping shank, and the end of the adjusting nut contacts the end of the spring.

Images