Cutting knife handle for machining

Abstract

A cutting knife handle for machining is characterized by comprising a knife handle body, an inserting hole, a blind rivet, a conical surface and an end face, the inserting hole is formed in the knife handle body, the blind rivet is arranged in the inserting hole, the conical surface is arranged on the outer side of the knife handle body, the end face is arranged at the upper end of the conical surface, a clamping jaw is arranged on the blind rivet, and the clamping jaw is arranged in a main shaft of a machine tool; the conical surface is shorter than the taper shank of the BT cutter handle, so that the weight of the cutter handle is reduced, and the cutter changing stroke is shortened; meanwhile, an inner hollow structure of the 1: 10 cutter handle is omitted, so that the manufacturing difficulty is reduced, and the machining cost is reduced; the risk of stress deformation of the knife handle is avoided by adopting conical surface attachment; and the non-self-locking and quick-dismounting performance is considered, and the device is more suitable for small-sized automatic spindles.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool holder technology, and in particular to a cutting tool holder for machining. Background Technology

[0002] As machining centers are increasingly used in the machining of parts, the use of machining center tool holders is also increasing. BT tool holders are most commonly used for general cutting, while HSK tool holders are more commonly used for high-speed cutting. The connection sequence is: spindle - tool holder - cutting tool.

[0003] Advantages of BT tool holders: 1. Non-locking, allowing for quick tool loading and unloading; 2. The taper of the tool holder is tightly in contact with the inner tapered surface of the spindle under the axial tension of the drawbar; 3. During manufacturing, the connection accuracy can be guaranteed simply by machining the taper angle to a high precision, resulting in relatively low cost and reliable operation.

[0004] Disadvantages of BT toolholders: 1. Individual taper positioning; the 7:24 taper toolholder has a large connecting taper and a long taper shank, resulting in a long tool change stroke and slow tool change time; the toolholder weight increases, increasing machine tool power consumption; 2. During high-speed rotation, due to centrifugal force and thermal expansion and contraction, the taper hole at the front end of the spindle will expand. The amount of expansion increases with the increase of the rotation radius and speed. Under the action of the tie rod tension, the toolholder will shift inward, resulting in low axial accuracy; there is a problem of unstable repeatability accuracy, making it unsuitable for high-speed cutting;

[0005] Advantages of 1:10 toolholders: 1. Under tension, end-face positioning prevents axial movement of the toolholder, with axial repeatability up to 1μm. Simultaneously, the tight fit of the end faces generates significant static friction, effectively suppressing the increase in centrifugal force on the spindle taper hole. Therefore, its radial runout does not exceed 5μm, resulting in high axial and radial accuracy. 2. The 1:10 taper shank is short (approximately half the length of a standard 7:24 taper shank) and lightweight (hollow shank), thus reducing tool change time and facilitating machine spindle miniaturization. 3. Due to the double-sided fit of the 1:10 toolholder, it possesses greater dynamic and static radial stiffness, making the tool system less prone to vibration, resulting in high machining accuracy and less tool wear. It is also highly suitable for high-speed operation with accurate centering.

[0006] Disadvantages of 1:10 tool holders: 1. Complex structure, high manufacturing precision requirements, and high cost (the price of the tool holder is 1.5 to 2 times that of the ordinary standard 7:24 tool holder); 2. 1:10 tool holders achieve two-sided positioning through conical surface deformation. When the tool holder is rotating at high speed, the deformation and stress will be more severe, thus reducing reliability.

[0007] To address the aforementioned problems, a cutting tool holder for machining is proposed. Utility Model Content

[0008] In view of the above-mentioned technical problems, this utility model provides a cutting tool holder for machining, characterized in that it includes a tool holder body, a socket, a pull stud, a conical surface, and an end face. The tool holder body is provided with a socket, and a pull stud is provided in the socket. The outer side of the tool holder body is provided with a conical surface, and the upper end of the conical surface is provided with an end face. A clamping jaw is provided on the pull stud, and the clamping jaw is provided in the spindle of a machine tool.

[0009] Furthermore, a portion of the pull stud is fixedly inserted into the insertion hole, and the other portion of the pull stud is located outside the tool holder body. The portion protruding from the tool holder body has a groove. The chuck is located inside the machine tool spindle and is controlled by an external hydraulic cylinder. The connecting end of the spindle has a slot, and the tool holder body is located in the slot. The chuck is clamped in the groove of the pull stud.

[0010] Furthermore, the conical surface is conical, extends into the spindle, and is in close contact with the inner wall of the slot in the spindle. The length of the conical surface is half the length of the standard 7:24 taper shank.

[0011] Furthermore, there is a gap between the end face and the end face of the spindle.

[0012] The beneficial effects of this utility model are:

[0013] This invention involves inserting the tool holder body into the slot of the spindle. At this point, the groove of the pull stud engages with the chuck, and the tapered surface of the tool holder body is tightly against the inner wall of the spindle. The contact length between the tool holder body and the spindle, i.e., the length of the tapered surface, is reduced to half the length of the existing standard 7:24 tapered shank, and is the same as the length of a 1:10 tapered shank. Simultaneously, there is a gap between the end face of the tool holder body and the end face of the spindle, preventing direct contact. An external hydraulic cylinder drives the chuck to move backward, which in turn moves the pull stud and the tool holder body backward. Simultaneously, the tapered surface of the tool holder body is tightly against the inner wall of the slot on the spindle. Due to the backward movement of the tool holder body, the connection between the tool holder body and the spindle is secure. The length of the tapered surface is shorter than that of the BT tool holder, reducing the weight of the tool holder and shortening the tool change stroke. Furthermore, the absence of the hollow structure of the 1:10 tool holder reduces manufacturing difficulty and processing costs. The tight tapered surface avoids the risk of tool holder deformation under stress. It also incorporates non-locking and quick-disassembly performance, making it more suitable for small automated spindles. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a cutting tool holder for machining according to the present invention;

[0015] Figure 2 This is a top view of a cutting tool holder for machining according to the present invention;

[0016] Figure 3This is a schematic diagram of the BB cross-section of a cutting tool holder for machining according to the present invention;

[0017] Figure 4 This is a schematic diagram of the DD cross-section of a cutting tool holder for machining according to the present invention;

[0018] As shown in the figure: 1. Tool holder body, 2. Insertion hole, 3. Pull pin, 4. Tapered surface, 5. End face, 6. Clamping jaw, 7. Spindle. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Example 1

[0023] This utility model provides a cutting tool holder for machining, characterized in that it includes a tool holder body 1, a socket 2, a pull stud 3, a conical surface 4, and an end face 5. The tool holder body 1 is provided with a socket 2, and a pull stud 3 is provided inside the socket 2. The outer side of the tool holder body 1 is provided with a conical surface 4, and the upper end of the conical surface 4 is provided with an end face 5. A clamping jaw 6 is provided on the pull stud 3, and the clamping jaw 6 is provided inside the spindle 7 of the machine tool.

[0024] Furthermore, a portion of the pull stud 3 is fixedly inserted into the insertion hole 2, and the other portion of the pull stud 3 is located outside the tool holder body 1. The portion of the tool holder body 1 that protrudes has a groove. The chuck 6 is located inside the spindle 7 of the machine tool and is controlled by an external hydraulic cylinder. The connecting end of the spindle 7 has a slot, and the tool holder body 1 is located in the slot. The chuck 6 is clamped in the groove of the pull stud 3.

[0025] Furthermore, the conical surface 4 is conical and extends into the main shaft 7. The conical surface 4 is in close contact with the inner wall of the slot in the main shaft 7, and the length of the conical surface 4 is 1 / 2 of the standard 7:24 cone shank length.

[0026] Furthermore, there is a gap between end face 5 and end face of spindle 7.

[0027] Example 2

[0028] In use, the pull pin 3 is positioned inside the insertion hole 2. The tool holder body 1 is inserted into the slot of the spindle 7. At this time, the groove of the pull pin 3 engages with the chuck 6. The tapered surface 4 of the tool holder body 1 is in close contact with the inner wall of the slot of the spindle 7. The contact length between the tool holder body 1 and the spindle 7, i.e., the length of the tapered surface 4, is reduced to half the length of the existing standard 7:24 tapered shank, and is the same as the length of the 1:10 tapered shank. At the same time, there is a gap between the end face 5 of the tool holder body 1 and the end face of the spindle 7, and they do not contact each other. An external hydraulic cylinder drives the chuck 6 to move backward, and the chuck 6 drives the pull pin 3 and the tool holder body 6 to move backward. The shank body 1 moves backward, and at the same time, the conical surface 4 of the shank body 1 is pressed against the inner wall of the slot of the spindle 7. Due to the backward movement of the shank body 1, the connection between the shank body 1 and the spindle 7 is firm. The length of the conical surface 4 is shorter than the length of the conical shank of the BT shank, which reduces the weight of the shank and shortens the tool change stroke. At the same time, there is no hollow structure of the 1:10 shank, which reduces the manufacturing difficulty and processing cost. The use of the conical surface 4 to press against the shank avoids the risk of deformation under force. It also takes into account the non-locking and quick disassembly performance, making it more suitable for small automated spindles 7.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cutting tool holder for machining, characterized in that, The tool holder includes a tool holder body, a socket, a pull stud, a tapered surface, and an end face. The tool holder body is provided with a socket, and a pull stud is provided inside the socket. The outer side of the tool holder body is provided with a tapered surface, and the upper end of the tapered surface is provided with an end face. A clamping jaw is provided on the pull stud, and the clamping jaw is provided inside the spindle of the machine tool.

2. The cutting tool holder for machining according to claim 1, characterized in that, A portion of the pull stud is fixedly inserted into the insertion hole, and the other portion of the pull stud is located outside the tool holder body. The portion of the pull stud that protrudes from the tool holder body has a groove. The chuck is located inside the spindle of the machine tool and is controlled by an external hydraulic cylinder. The connecting end of the spindle has a slot, and the tool holder body is located in the slot. The chuck is clamped in the groove of the pull stud.

3. A cutting tool holder for machining according to claim 1, characterized in that, The conical surface is conical and extends into the spindle. The conical surface is in close contact with the inner wall of the slot in the spindle, and the length of the conical surface is 1 / 2 of the length of the standard 7:24 taper shank.

4. A cutting tool holder for machining according to claim 1, characterized in that, There is a gap between the end face and the end face of the spindle.

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