Cutter for machining high-precision concentric circles

Abstract

The utility model relates to the technical field of numerical control cutters, in particular to a cutter for machining high-precision concentric circles. Comprising a cutter handle and an auxiliary assembly, the cutter handle is provided with a threaded broaching hole and a first water through hole, the auxiliary assembly comprises a cutter bar and a blade, the cutter bar is provided with a second water through hole and a water guide groove, and during machining, a main shaft rotates to drive the cutter handle to rotate, so that the cutter bar rotates for machining; water flow enters the first water through hole and the second water through hole, part of the water flow is directly sprayed out through the second water through hole to flush chips, part of the water flow is sprayed to one side of the blade through the water guide groove during spraying to flush the blade, the water flow can directly carry heat in the cutter when passing through the first water through hole and the second water through hole, and cooling is achieved. And internal and external cooling is realized with an external cooling nozzle, so that the cooling effect of the cutter can be improved during processing and use, the service life of the cutter is prolonged, the replacement time is prolonged, and the processing and use cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of CNC cutting tool technology, and in particular to a cutting tool for machining high-precision concentric circles. Background Technology

[0002] Cutting tools are tools used for cutting in machining. In addition to the cutting inserts, most CNC cutting tools also include tool holders and tool shanks.

[0003] Traditional CNC cutting tools typically have a one-piece molded tool holder and tool shank, ensuring machining strength. However, during machining, they mostly rely on external water supply, which involves adding external cooling water nozzles to spray water to cool and wash away machining chips. However, the heat conducted inside the tool is difficult to dissipate quickly, resulting in poor cooling effect. This significantly reduces the tool's lifespan, shortens tool replacement time, and increases machining costs. Utility Model Content

[0004] The purpose of this invention is to provide a cutting tool for machining high-precision concentric circles, which aims to improve the cooling effect of the tool during machining, extend the tool's service life, reduce replacement time, and reduce machining and usage costs.

[0005] To achieve the above objectives, this utility model provides a tool for machining high-precision concentric circles, including a tool holder, a threaded drawing hole on the tool holder, the threaded drawing hole being located at the top of the tool holder, and auxiliary components;

[0006] The auxiliary component includes a blade and a blade. The blade is integrally formed with the handle and is located below the handle. The blade is detachably connected to the blade and is located at the bottom of the blade.

[0007] The handle has a first water passage hole, which communicates with the threaded hole and is located inside the handle. The shank has a second water passage hole and a water guide groove, which communicates with the first water passage hole and is located inside the shank. The water guide groove communicates with the second water passage hole and is located on the side of the shank closer to the blade.

[0008] The tool holder also has positioning grooves, which are symmetrically arranged on both sides of the tool holder.

[0009] The tool handle also has a tool arm retaining groove, which is located on the side of the tool handle near the positioning groove.

[0010] The blade has a rounded edge with a radius of 0.8.

[0011] The outer side of the tool holder is provided with a wear-resistant layer.

[0012] This utility model discloses a cutting tool for machining high-precision concentric circles. The tool holder mounting part has a Morse taper and a threaded pull hole at the top for easy installation of a pull stud with a water outlet. The pull stud can be tightened by a pull rod and pull claw inside the spindle with a center water outlet, thereby achieving a fixed connection between the tool and the spindle. A first water passage hole is provided inside the tool holder, and a second water passage hole is provided inside the tool shank, communicating with the first water passage hole. A water guide groove is provided at the bottom of the tool shank, communicating with the second water passage hole. The cutting tool is mounted on the bottom mounting end of the tool shank. During machining, after the tool is mounted on the machine tool spindle, the spindle rotates, driving the tool holder to rotate, thus rotating the tool shank. It can perform machining. At the same time, because the spindle has a central water outlet, the water flows through the pull stud water guide hole and then into the first and second water passage holes. Some of the water can be sprayed directly out through the second water passage hole to wash away chips, while some of the water will be sprayed towards the side of the cutting tool through the water guide groove to wash the cutting tool. When the water flows through the first and second water passage holes, it can directly carry away the heat inside the cutting tool to achieve cooling. When combined with the external cooling nozzle, it can achieve internal and external cooling treatment, improve the cooling effect, and thus improve the cooling effect of the cutting tool during machining. This helps to extend the tool's service life, extend the replacement time, and reduce machining and operating costs. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the overall structure of the cutting tool for machining high-precision concentric circles according to the first embodiment of this utility model.

[0015] Figure 2 This is a bottom view of the cutting tool for machining high-precision concentric circles according to the first embodiment of this utility model.

[0016] Figure 3 This is a cross-sectional view of the tool holder according to the first embodiment of this utility model.

[0017] Figure 4 This is a schematic diagram of the overall structure of the cutting tool for machining high-precision concentric circles according to the second embodiment of this utility model.

[0018] Figure 5 This is a schematic diagram showing the location of the wear-resistant layer in the second embodiment of this utility model.

[0019] In the figure: 101-tool holder, 102-threaded pull hole, 103-tool bar, 104-blade, 105-first water passage hole, 106-second water passage hole, 107-water guide groove, 108-positioning groove, 109-tool arm slot, 201-wear-resistant layer. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0021] Example 1:

[0022] like Figures 1 to 3 As shown, where Figure 1 This is a schematic diagram of the overall structure of a cutting tool for machining high-precision concentric circles. Figure 2 This is a bottom view of a cutting tool used for machining high-precision concentric circles. Figure 3 This is a cross-sectional view of the tool holder 103. This utility model provides a tool for machining high-precision concentric circles: it includes a tool holder 101 and auxiliary components. The tool holder 101 has a threaded drawing hole 102 and a first water passage hole 105. The auxiliary components include a tool holder 103 and a cutting insert 104. The tool holder 103 has a second water passage hole 106 and a water guide groove 107. This solution improves the tool cooling effect during machining, extending tool life and replacement time, thus reducing machining costs. It is understood that this solution improves tool cooling during machining, extending tool life and replacement time, and reducing machining costs.

[0023] In this embodiment, the tool holder 101 has a threaded pull hole 102, which is located at the top of the tool holder 101. The mounting part of the tool holder 101 has a Morse taper, which facilitates installation and mating with the Morse taper hole of the equipment spindle. The threaded pull hole 102 at the top facilitates the installation of pull studs with water outlets. The pull studs can be tightened by the pull rod and pull claw inside the spindle with a center water outlet, thereby realizing the installation and connection of the tool and the spindle.

[0024] The tool holder 103 is integrally formed with the tool shank 101 and is located below the tool shank 101. The cutting blade 104 is detachably connected to the tool holder 103 and is located at the bottom of the tool holder 103. Both the tool shank 101 and the tool holder 103 are made of 42CrMo. 42CrMo material has a high fatigue limit and resistance to repeated impacts, which will greatly improve the rigidity, precision, stability and life of the tool, thereby ensuring the quality and efficiency of the processed products. The tool holder 103 and the tool shank 101 are integrally formed to ensure processing strength. The cutting blade 104 is made of cemented carbide. Cemented carbide has the characteristics of high hardness, wear resistance, good strength and toughness, good heat resistance, strong corrosion resistance and a series of other excellent properties. In particular, its high hardness and wear resistance remain basically unchanged even at a temperature of 500℃, and still have high hardness at 1000℃, which makes the tool have good cutting performance. The cutting blade 104 is installed on the bottom mounting part of the tool holder 103 by special bolts.

[0025] The handle 101 has a first water passage hole 105, which communicates with the threaded pull hole 102 and is located inside the handle 101. The blade shank 103 has a second water passage hole 106 and a water guide groove 107. The second water passage hole 106 communicates with the first water passage hole 105 and is located inside the blade shank 103. The water guide groove 107 communicates with the second water passage hole 106 and is located on the side of the blade shank 103 near the blade 104. The first water passage hole 105 communicates with the threaded pull hole 102, the second water passage hole 106 communicates with the first water passage hole 105, and the water guide groove 107 communicates with the second water passage hole 106.

[0026] Secondly, the tool holder 101 also has positioning grooves 108, which are symmetrically arranged on both sides of the tool holder 101. The symmetrical arrangement of the positioning grooves 108 ensures that, during installation, the positioning key on the spindle will slide into the positioning grooves 108, guaranteeing the stability of the tool's installation and fit with the spindle.

[0027] Then, the tool holder 101 also has a tool arm slot 109, which is located on the side of the tool holder 101 near the positioning groove 108. The tool arm slot 109 facilitates the insertion of an external tool changing robot to realize automatic tool changing.

[0028] Finally, the cutting edge of the blade 104 is provided with a radius of 0.8. Providing a radius of 0.8 on the cutting edge of the blade 104 will improve its wear resistance, extend its service life, and further extend the service life of the cutting tool.

[0029] When using the tool for machining high-precision concentric circles according to this invention, the tool is first installed on the machine tool spindle. During installation, the control button of the tool-setting hydraulic cylinder is pressed, causing the internal pull rod to descend and the pull claw to open. At this time, the Morse taper mounting part at the top of the tool holder 101 is installed in the Morse taper hole of the spindle. Then, the control button of the tool-setting hydraulic cylinder is pressed, causing the pull rod to ascend. Under the action of the disc spring on the pull rod, the pull stud at the top of the tool holder 101 is tightened by the pull claw, completing the tool installation. After the machine spindle rotates, it drives the tool holder 101 to rotate, thereby rotating the tool holder 103. Machining can then be performed with the cooperation of the cutting tool 104. At the same time, because the spindle has a central water outlet, water flows through the pull stud. After passing through the water guide hole, the water continues to flow downwards after entering the first water passage hole 105 and the second water passage hole 106. Some of the water can be sprayed directly out through the second water passage hole 106 to flush away chips, while some of the water will be sprayed towards the side of the blade 104 through the water guide groove 107 during spraying, which can rinse the blade 104. Furthermore, when the water flows through the first water passage hole 105 and the second water passage hole 106, it can directly carry away the internal heat of the tool to achieve cooling. When combined with the external cooling nozzle, it can also achieve internal and external cooling treatment, improve the cooling effect, and thus improve the cooling effect of the tool during processing and use, which is conducive to extending the tool's service life, extending the replacement time, and reducing processing and use costs.

[0030] Example 2:

[0031] like Figure 4 Figure 5 ,in Figure 4 A schematic diagram of the overall structure of a tool for machining high-precision concentric circles. Figure 5 A schematic diagram showing the location of the wear-resistant layer 201. Based on the first embodiment, this utility model provides a cutting tool for machining high-precision concentric circles, wherein the outer side of the tool holder 103 is provided with a wear-resistant layer 201.

[0032] In this embodiment, by providing the wear-resistant layer 201 on the outer side of the tool holder 103, the wear resistance of the tool holder 103 will be further improved, and damage to its outer surface by iron filings during processing will be avoided.

[0033] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A cutter for machining high-precision concentric circles, comprising a cutter handle, wherein a threaded hole is formed on the top of the cutter handle, characterized in that, an auxiliary assembly is further included; the auxiliary assembly comprises a cutter rod and a cutter blade, wherein the cutter rod is integrally formed with the cutter handle and located below the cutter handle, and the cutter blade is detachably connected with the cutter rod and located at the bottom of the cutter rod. a first water hole is formed on the cutter handle, the first water hole is in communication with the threaded hole and located inside the cutter handle, a second water hole and a water guide groove are formed on the cutter rod, the second water hole is in communication with the first water hole and located inside the cutter rod, and the water guide groove is in communication with the second water hole and located on the side of the cutter rod close to the cutter blade.

2. The cutter for machining high-precision concentric circles according to claim 1, characterized in that, a positioning groove is further formed on the cutter handle, and the positioning groove is symmetrically arranged on both sides of the cutter handle.

3. The cutter for machining high-precision concentric circles according to claim 2, characterized in that, a cutter arm clamping groove is further formed on the cutter handle, and the cutter arm clamping groove is located on the side of the cutter handle close to the positioning groove.

4. The cutter for machining high-precision concentric circles according to claim 1, characterized in that, the cutter blade has a round corner with an R value of 0.

8.

5. The cutter for machining high-precision concentric circles according to claim 1, characterized in that, a wear-resistant layer is arranged on the outside of the cutter rod.

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