Quick change type tool shank structure with high positioning accuracy

Abstract

The objective of the present invention is to provide a quick-change type tool shank structure with high positioning accuracy. [Solution] The tool holder includes a head portion, a tool holder, and a tool shank which are connected in sequence, a communication through hole is provided in the center of the tool holder and the tool shank, two threaded bolts are provided in the through hole, both ends of the two threaded bolts are connected to the head portion and the tool shank, respectively, and a head portion fitting hole is provided on the inner cylindrical surface of the end of the through hole of the tool holder which is closer to the head portion, and the head portion fitting hole is fitted and connected to the head portion. The present invention has the following advantageous effects: The head portion and the tool shank are connected by two threaded bolts, and the tool holder does not need to be threaded, so that a hard alloy material can be used for the tool holder, and further, in combination with the structure of the fitting hole, the technical problem that the structure of the conventional tool shank is too complicated is solved, and a tool holder structure which is simple in structure and has high positioning accuracy is obtained.

Description

[Technical Field]

[0001] The present invention relates to the technical field of tools, and more particularly to a quick-change type tool shank structure with high positioning accuracy. [Background technology]

[0002] Currently, conventional tools are generally fixed to the tool shank by welding. However, after cutting metal surfaces for a long time, the cutting edge of the tool inevitably wears out. Because the tool and tool shank are integrated, if the tool and tool shank become damaged after long-term use, the only option is to discard the entire tool and tool shank, resulting in waste of material.

[0003] To solve the above problems, the method currently used on the market is to separate the tool head and tool holder into two parts, which are joined by a screw, and then after the head wears out, it is enough to simply replace the head.

[0004] However, when the above method is applied to hard alloy tools, there is a problem that direct thread connection is not possible because thread processing on hard alloy materials is too difficult.

[0005] For this reason, in actual use, a removable cover plate provided in the rough hole in the tool shank body can limit the axial movement of the clamping screw. In other words, by using the clamping screw and cover plate together, even if the head portion becomes worn, it can be easily replaced. This is the result of the development of a quick-change HSK tool shank with high positioning accuracy, as disclosed in Patent Document 1.

[0006] However, this structure requires a complex cover plate and other components, and requires the cover plate and the clamping screw to be assembled, which makes the assembly of the tool shank and head relatively difficult. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Chinese Patent No. CN212420429U Publication Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention addresses the shortcomings of the prior art and provides a quick-change type tool shank structure with high positioning accuracy that solves the technical problem that the structure of the conventional tool holder is too complicated. [Means for solving the problem]

[0009] A quick-change type tool shank structure with high positioning accuracy described in an embodiment of the present invention comprises a head portion, a tool holder, and a tool shank connected in this order, with a communication through hole provided in the center of the tool holder and the tool shank, two threaded bolts provided in the through hole, both ends of which are connected to the head portion and the tool shank, respectively, and a head portion fitting hole provided on the inner cylindrical surface of the end of the through hole of the tool holder closest to the head portion, with the head portion fitting hole being fitted and connected to the head portion.

[0010] Technical principle of the present invention: By inserting both threaded bolts into the tool holder to directly connect the tool shank and head, the head and tool holder are fitted with mating holes, ensuring the axial and radial positioning accuracy of the head and tool holder.

[0011] Compared with the prior art, the present invention has the following advantageous effects: The head and tool shank are connected by a double-threaded bolt, eliminating the need for threading on the tool holder, allowing the tool holder to be made of a hard alloy material, and in combination with the mating hole structure, this solves the technical problem of the conventional tool shank structure being too complicated, resulting in a tool holder structure that is simple in structure and has high positioning accuracy.

[0012] Furthermore, one end of each of the two threaded bolts is provided with a female thread for coupling with the head portion, and the other end of each of the two threaded bolts is provided with a male thread for coupling with the tool shank.

[0013] Furthermore, a hexagonal hole is provided on the side of the double-threaded bolt that is closer to the male thread.

[0014] By inserting a hexagonal wrench into the hexagonal hole, the double-threaded bolt can be easily connected to the tool shank.

[0015] In addition, a stepped shaft is provided at one end of the head portion, the larger end of the stepped shaft is a fitting portion, and the smaller end of the stepped shaft is a screw post, the screw post is coupled with a female thread, and the fitting portion engages with the head portion fitting hole.

[0016] The head fitting hole has two head fitting surfaces, and a relief groove is provided between the two head fitting surfaces.

[0017] In addition, the fitting portion has two interference fit surfaces, a recess groove is provided between the two interference fit surfaces, a recess groove is provided at the joint between the head portion and the stepped shaft, the two interference fit surfaces correspond to the two head portion fitting surfaces and fit together, and the recess groove on the fitting portion corresponds to the recess groove of the head portion fitting hole.

[0018] Furthermore, the connecting end surface between the tool holder and the head portion serves as a regulating surface, and the portion exposed on the outside of the end of the head portion that mates with the stepped shaft serves as a regulating mating surface, and the regulating mating surface conforms to the regulating surface.

[0019] In addition, a main cooling hole is provided in the center of the head portion, bits are uniformly arranged in the circumferential direction at the end of the head portion away from the tool holder, and sub-cooling holes are uniformly arranged in the circumferential direction on the side of the head portion closer to the bits, all of the sub-cooling holes communicate with the main cooling hole, and a cooling through-hole is provided in the center of both of the threaded bolts, and the cooling through-hole connects the main cooling passage with the through-hole of the tool shank.

[0020] The end of the tool holder remote from the head portion is provided as a tool holder fitting surface, and a tool shank fitting hole is provided in the center of the side of the tool shank that connects to the tool holder, and the tool holder fitting surface is connected to the tool shank fitting hole by an interference fit.

[0021] The tool holder is made of a hard alloy material, and the head and tool shank are made of an alloy steel material. [Effects of the Invention]

[0022] 1. The head made of alloy steel and the threaded part on the tool shank are combined with the threaded part on the double-ended screw bolt, thereby realizing quick attachment and detachment of the head on the hard alloy tool holder.

[0023] 2. The engagement of the head mating hole with the mating part ensures the accuracy of the axial positioning of the head and the tool holder, and the mating of the control surface with the control mating surface ensures the accuracy of the radial positioning of the head and the tool holder.

[0024] 3. By connecting the main cooling hole and the sub-cooling hole with the cooling through-hole, the cooling medium can be directly discharged from the sub-cooling hole in the head section to cool the head section. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a side view of a quick change tool shank structure with high positioning accuracy according to an embodiment of the present invention. [Figure 2] 1 is a cross-sectional view of a quick change tool shank structure with high positioning accuracy according to an embodiment of the present invention. FIG. [Figure 3] FIG. 2 is a cross-sectional view of a head portion according to an embodiment of the present invention. [Figure 4] FIG. 3 is a partially enlarged view of a portion A in FIG. 2.

[0026] In the figure, 100 is a head unit, 101 is a Position limit mating surface, 102 Byte, 110 Mating part, 111 Interference fit surface , 112 recessed groove, 120 screw post, 130 main cooling hole, 131 secondary cooling hole, 200 tool holder, 201 Position restriction surface , 202 tool holder mating surface, 210 head mating hole, 211 head mating surface, 212 relief groove, 300 tool shank, 301 tool shank mating hole, 400 through hole, 500 double-threaded bolt, 510 female thread, 520 male thread, 530 hexagonal socket, 540 cooling through hole. DETAILED DESCRIPTION OF THE INVENTION

[0027] The technical means of the present invention will be further described below with reference to the drawings and embodiments.

[0028] As shown in FIG. 1, the quick-change type tool shank 300 structure with high positioning accuracy comprises a head portion 100, a tool holder 200, and a tool shank 300, which are connected in sequence. Specifically, the tool holder 200 is made of a hard alloy material, which improves the durability of the tool holder 200, and the head portion 100 and the tool shank 300 are made of an alloy steel material, which is relatively easy to thread and has excellent mechanical properties in all respects.

[0029] As shown in FIG. 2 , a communication through-hole 400 is provided in the center of the tool holder 200 and the tool shank 300, and a double-threaded bolt 500 is provided in the through-hole 400, and both ends of the double-threaded bolt 500 are connected to the head 100 and the tool shank 300, respectively. Specifically, one end of the double-threaded bolt 500 is provided with a female thread 510 for connection with the head 100, and the other end of the double-threaded bolt 500 is provided with a male thread 520 for connection with the tool shank 300. A hexagonal socket 530 is provided on the side of the double-threaded bolt 500 closest to the male thread 520. That is, the through-hole 400 in the tool shank 300 has a threaded portion that fits the male thread 520, and the hexagonal socket 530 makes it easy to fasten the male thread 520 to the tool shank 300 with a hexagonal wrench.

[0030] 2 to 4 , a head fitting hole 210 is formed on the inner cylindrical surface of the end of the through hole 400 of the tool holder 200 closest to the head 100, and the head fitting hole 210 is fitted and connected to the head 100. Specifically, a stepped shaft is integrally formed on one end of the head 100, and the large end of the stepped shaft is the fitting portion 110 and the small end of the stepped shaft is the threaded post 120. The threaded post 120 is coupled with a female thread 510, allowing the head 100 to be quickly replaced and attached by simply turning the double-ended threaded bolt 500. The fitting portion 110 is fitted into the head fitting hole 210, and the high-precision fit between the fitting portion 110 and the head fitting hole 210 ensures accurate positioning of the head 100 and the tool holder 200.

[0031] As shown in Figures 3 and 4, the head portion fitting hole 210 has two head portion fitting surfaces 211, with an undercut groove 212 provided between the two head portion fitting surfaces 211; the fitting portion 110 has two interference fit surfaces 111, with an undercut groove 212 also provided between the two interference fit surfaces 111; a recessed groove 112 is provided at the joint between the head portion 100 and the stepped shaft to ensure dimensional accuracy of the interference fit surfaces 111; the two interference fit surfaces 111 correspond to the two head portion fitting surfaces 211 and cooperate with each other to ensure axial overlap accuracy of the head portion 100 and the tool holder 200; and the undercut groove 212 on the fitting portion 110 corresponds to the undercut groove 212 on the head portion fitting hole 210.

[0032] As shown in FIGS. 3 and 4, the connecting end surface between the tool holder 200 and the head portion 100 is Position restriction surface 201, and the exposed part on the outside of the end that fits with the stepped shaft of the head part 100 is Position limit mating surface It becomes 101, Position limiting surface 201 and position limiting mating surface 101 come into contact with each other, whereby the head portion (100) is fixed at a predetermined position in the axial direction of the tool holder (200). . That's all

[0033] As shown in FIG. 2 , a tool holder mating surface 202 is provided at the end of tool holder 200 away from head portion 100, and a tool shank mating hole 301 is provided in the center of the side of tool shank 300 that connects to tool holder 200. Tool holder mating surface 202 is connected to tool shank mating hole 301 by an interference fit, thereby tightly connecting tool shank 300 and tool holder 200.

[0034] As shown in Figures 2 and 3, a main cooling hole 130 is provided in the center of the head portion 100, bits 102 are uniformly arranged in the circumferential direction at the end of the head portion 100 away from the tool holder 200, and sub-cooling holes 131 are uniformly arranged in the circumferential direction on the side of the head portion 100 closer to the bits 102 and are used to discharge a cooling medium to cool the bits 102 and discharge chips. All of the sub-cooling holes 131 are connected to the main cooling hole 130, and a cooling through-hole 540 is provided in the center of both screw bolts 500. The cooling through-hole 540 connects the main cooling passage with the through-hole 400 of the tool shank 300, so that the cooling medium can enter the cooling through-hole 540 of both screw bolts 500 through the through-hole 400 of the tool shank 300 and then enter the main cooling hole 130.

[0035] Finally, it should be noted that the above embodiments are only used to explain the technical means of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above preferred embodiments, it will be understood by those skilled in the art that the technical means of the present invention can be modified or replaced within an equivalent range without departing from the spirit and scope of the technical means of the present invention.

Claims

1. A tooling structure, The tool comprises a head portion (100), a tool holder (200) and a tool shank (300) connected in sequence; A through hole (400) communicating with each other is provided at the center of the tool holder (200) and the tool shank (300), two threaded bolts (500) are provided in the through hole (400), and both ends of the two threaded bolts (500) are connected to the head portion (100) and the tool shank (300), respectively; a head portion fitting hole (210) is provided on the inner cylindrical surface of the end of the through hole (400) of the tool holder (200) close to the head portion (100), and the head portion fitting hole (210) and the head portion (100) are fitted and connected; One end of the double-threaded bolt (500) is provided with a female thread (510) for coupling with the head portion (100), and the other end of the double-threaded bolt (500) is provided with a male thread (520) for coupling with the tool shank (300); a stepped shaft is provided along the axial direction of the head portion (100) on the side that connects to the tool holder (200), the stepped shaft having a narrow portion with a small diameter and a thick portion with a large diameter, the thick portion of the stepped shaft being a fitting portion (110), the thin portion of the stepped shaft being a screw post (120), the screw post (120) being coupled with the female thread (510) provided in the double-threaded bolt (500), and the fitting portion (110) being fitted into the head portion fitting hole (210); The head portion fitting hole (210) has two head portion fitting surfaces (211) arranged at different positions in the axial direction, and a relief groove (212) is provided between the two head portion fitting surfaces (211); The fitting portion (110) has two interference-fit surfaces (111) arranged at different positions in the axial direction, and a relief groove (212) is also provided between the two interference-fit surfaces (111), and a recess groove (112) is provided at the joint between the head portion (100) and the stepped shaft, The two interference-fit surfaces (111) and the two head portion mating surfaces (211) abut against each other and are interference-fitted, so that the axes of the head portion (100) and the tool holder (200) are on the same straight line; The relief groove (212) on the fitting portion (110) and the relief groove (212) on the head portion fitting hole (210) are at the same position in the axial direction and share a space with each other. The tooling structure.

2. 2. The tooling structure according to claim 1, wherein the double-threaded bolt (500) has a hexagonal hole (530) on the side closer to the male thread (520).

3. The end surface of the tool holder (200) for connecting with the head portion (100) serves as a position limiting surface (201), The end face of the head portion (100) that fits with the stepped shaft has an exposed portion that serves as a position limiting fitting surface (101), 2. The tooling structure according to claim 1, wherein the position limiting surface (201) and the position limiting mating surface (101) abut against each other to fix the head portion (100) at a predetermined position in the axial direction of the tool holder (200).

4. 2. The tooling structure according to claim 1, wherein a main cooling hole (130) is provided in the center of the head portion (100), cutting tools (102) are uniformly arranged in a circumferential direction on an end of the head portion (100) away from the tool holder (200), and auxiliary cooling holes (131) are uniformly arranged in a circumferential direction on a side of the head portion (100) closer to the cutting tools (102), and all of the auxiliary cooling holes (131) are connected to the main cooling hole (130), and a cooling through hole (540) is provided in the center of both threaded bolts (500), and the cooling through hole (540) connects a main cooling passage with the through hole (400) of the tool shank (300).

5. 2. The tooling structure according to claim 1, wherein an end of the tool holder (200) remote from the head portion (100) is provided as a tool holder mating surface (202), a tool shank mating hole (301) is provided in the center of the side of the tool shank (300) that connects to the tool holder (200), and the tool holder mating surface (202) is coupled to the tool shank mating hole (301) by an interference fit.

6. 6. The tooling structure of claim 5, wherein the tool holder (200) is made of a hard metal material, and the head portion (100) and the tool shank (300) are made of an alloy steel material.

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