Large disc milling cutter

Abstract

The utility model relates to the technical field of cold machining, in particular to a large-disc milling cutter which comprises a cutter head body, a plurality of main cutter clamps arranged around the cutter head body and a plurality of cutters. The plurality of main cutter clamps are mutually spliced to form an annular structure and are detachably and fixedly mounted on the cutter head main body; at least one mounting surface is formed on the main cutter holder, and the cutter is fixedly mounted on the mounting surface and is used for cutting a product. According to the invention, the maintenance cost is obviously reduced.

Description

Technical Field

[0001] This application relates to the field of cold working technology, and particularly to a large-diameter milling cutter. Background Art

[0002] A large-diameter milling cutter is mainly aimed at a milling cutter module with a large diameter and is a component for cold processing of products. Its main components include a cutter head and cutting tools. The cutting tools are fixedly installed on the cutter head to drive the cutting tools to perform milling operations through the rotation of the cutter head.

[0003] In the large-diameter milling cutter in the prior art, in order to stably install the cutting tools on the cutter head, cutter grooves are formed on the cutting surface of the cutter head, and the cutting tools are fixed in the cutter grooves so that the inner walls of the cutter grooves can withstand the impact force during the movement of the cutting tools and complete the milling process.

[0004] However, in actual use, since the inner walls of the cutter grooves on the cutter head directly bear the impact force of the cutting tools, and since the cutting tools are positioned and fixed through the cutter grooves, during use, due to the excessive impact force of the cutting tools, it is extremely easy to cause plastic deformation of the cutter grooves, resulting in changes in the cutting angles and positions of the cutting tools. And if the deformation of the inner walls of the cutter grooves is too large, there will be a relatively large error between the positioning of the cutting tools and the predetermined position. In order to meet the processing accuracy, it is only possible to remove the cutter head for repair or directly replace the cutter head. On the one hand, the disassembly and assembly of the large cutter head on the machine tool are relatively complicated, seriously affecting production; on the other hand, the cost of replacing the cutter head is relatively high, and the cost pressure is relatively large. Therefore, how to maintain the damage of the cutter head at a relatively low cost while maintaining the processing accuracy is an urgent problem to be solved at present. Utility Model Content

[0005] In order to maintain the damage of the cutter head at a relatively low cost while maintaining the processing accuracy, this application provides a large-diameter milling cutter.

[0006] A large-diameter milling cutter provided by this application adopts the following technical solution:

[0007] A large-diameter milling cutter includes a cutter head body, a plurality of main tool holders arranged around the cutter head body, and a plurality of cutting tools.

[0008] The plurality of main tool holders are spliced into an annular structure and are detachably and fixedly installed on the cutter head body.

[0009] The main tool holder is formed with at least one mounting surface, and the cutting tool is fixedly installed on the mounting surface for cutting processing of products.

[0010] By adopting the above technical solution, since there are multiple main tool holders, and the tool is connected to the tool disc body through the main tool holder, the impact force of the tool will be directly transmitted to the main tool holder and borne by the main tool holder. Therefore, if the impact force is too large, the main tool holder will be damaged first. At this time, in order to ensure the machining accuracy and stability, only the corresponding main tool holder needs to be replaced, rather than the whole replacement. Thus, it can be maintained at a relatively low cost. At the same time, since only partial workpiece replacement is required, the maintenance efficiency is significantly improved.

[0011] Meanwhile, due to the limitation of the machine tool stroke, the diameter of the tool disc body is restricted within a certain range. At this time, the diameter application range during normal use can also be expanded by machining tool disc bodies with the same diameter and using modular assembled main tool holders. On the one hand, it is convenient for later maintenance; on the other hand, compared with directly machining a large-diameter tool disc as a whole, it is not only limited by the machine tool stroke size, but also by using a tool disc body combined with modular main tool holders to extend the application diameter range. In the case of the same application size diameter, the cost is obviously relatively lower.

[0012] Optionally, an installation ring groove for lap-jointing with the main tool holder is formed on the outer edge of the tool disc body. The main tool holder is provided with a connection component for connecting the tool disc body. The connection component includes at least two groups of connection bolts threadedly connected to the tool disc body, and different groups of the connection bolts fasten the main tool holder to the inner wall of the installation ring groove from different directions.

[0013] By adopting the above technical solution, the main tool holder is lapped on the inner wall of the installation ring groove, so that the impact force borne by the main tool holder can be relatively stably transmitted to the tool disc body; at the same time, since the connection bolts press the main tool holder against the inner wall of the installation ring groove from different directions, the stability of the main tool holder relative to the tool disc body and the ability to bear the impact force during use can be significantly increased.

[0014] Optionally, there are two groups of the connection bolts. One group of the connection bolts fastens the main tool holder to the inner wall of the installation ring groove along the direction perpendicular to the tool disc body, and the other group of the connection bolts is threadedly connected to the tool disc body along the direction intersecting with the rotation plane of the tool disc body and towards the center of the tool disc body.

[0015] By adopting the above technical solution, the connection bolts perpendicular to the tool disc body can make the main tool holder fit relatively tightly to the installation ring groove. At the same time, the connection bolts intersecting with the tool disc body plane can directly bear the torque generated by the main tool holder during the cutting process to optimize the stability during use.

[0016] Optionally, clearance grooves are provided at the fillet positions of the mutually cooperating structures of the installation ring groove and the main tool holder.

[0017] By adopting the above technical solution, the fitting between the main tool holder and the mounting ring groove can be made closer, reducing the possibility that the main tool holder and the inner wall of the mounting ring groove are in clearance fit due to burrs or flash.

[0018] Optionally, the tool disc body is provided with a plurality of positioning members corresponding to at least the main tool holders one by one, and the tool disc body is provided with positioning grooves extending to the main tool holders corresponding to the positioning members one by one; the positioning member includes a positioning block and a positioning bolt for fixing the positioning block to the tool disc body, and the positioning block is clamped in the positioning groove.

[0019] By adopting the above technical solution, the positioning block is fixed to the tool disc body by the positioning bolt. At this time, the main tool holder will bear the tangential impact force of the tool disc body during cutting. At this time, the impact force can be directly borne through the limitation of the positioning block.

[0020] Optionally, the positioning groove is in an arc-shaped structure on the end face of the tool disc body, and avoidance grooves are provided at the corners of the positioning groove corresponding to the main tool holder part.

[0021] By adopting the above technical solution, the positioning block can have a certain swing margin to buffer the main tool holder when the impact force is too large.

[0022] Optionally, there are two installation surfaces, and the two installation surfaces are arranged at an included angle. One of the installation surfaces is arranged at the outer edge position of the main tool holder and forms an annular surface structure in cooperation with the installation surfaces of other main tool holders, and the other installation surface is arranged on the end face of the main tool holder along the axial direction of the tool disc body and forms an annular surface structure in cooperation with the other installation surfaces of other main tool holders.

[0023] By adopting the above technical solution, it can be respectively used for straight-edge cutting or slope processing.

[0024] Optionally, a plurality of tool grooves for fixedly installing tools are formed on the installation surface, the tools are clamped and fixed in the tool grooves, the tools on the main tool holder are distributed in a staggered manner both circumferentially and from the inside to the outside along the tool disc body, and the cutting edges of adjacent tools on the main tool holder partially overlap along the circumferential feed path.

[0025] By adopting the above technical solution, the tool grooves can limit the rotation of the tools to perform stable cutting.

[0026] Optionally, the distribution path of the tool grooves on the same main tool holder is in a V shape.

[0027] By adopting the above technical solution, during cutting, different torques in different directions are generated during the cutting processes of different tools, reducing the possibility of local deformation of the main tool holder during long-term use.

[0028] Optionally, a chip evacuation groove communicating with the tool groove is formed in the mounting surface, and the chip evacuation groove is used to discharge chips to the outside of the main tool holder.

[0029] By adopting the above technical solution, the chips generated by cutting can be temporarily stored or discharged to the outside of the main tool holder through the chip evacuation groove, reducing the possibility of scratching the product or affecting the cutting process.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] During use, since the main tool holder is modularly arranged and detachable relative to the tool disc body, when the impact force during tool cutting is too large and the main tool holder is damaged, only the corresponding main tool holder needs to be directly replaced, instead of removing the tool disc body relative to the machine tool to replace the whole. On the one hand, the maintenance cost is significantly reduced; on the other hand, only the damaged main tool holder needs to be disassembled and replaced, and compared with replacing the whole tool disc body, the efficiency is significantly improved. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of an embodiment of the present application.

[0033] Figure 2 is a schematic cross-sectional structural diagram of an embodiment of the present application.

[0034] Figure 3 is Figure 2 an enlarged schematic structural diagram of part B in

[0035] Figure 4 is Figure 1 an enlarged schematic structural diagram of part A in

[0036] Figure 5 is a schematic structural diagram of the main tool holder in an embodiment of the present application.

[0037] Description of the reference numerals: 1, tool disc body; 10, mounting groove; 101, mating port; 11, mounting ring groove; 12, positioning member; 121, positioning block; 122, positioning bolt; 13, positioning groove; 131, avoidance groove; 2, main tool holder; 21, mounting surface; 211, tool groove; 212, chip evacuation groove; 22, clearance groove; 3, tool; 4, connection assembly; 41, connection bolt. Detailed Description of the Embodiment

[0038] The following further describes the present application in detail with reference to the Figures 1-5 drawings.

[0039] An embodiment of the present application discloses a face milling cutter. Refer to Figure 1 and Figure 2, the face milling cutter includes a cutter head body 1, a plurality of main tool holders 2 arranged around the cutter head body 1, and a plurality of cutting tools 3. The cutter head body 1 has a disc-shaped structure, and mounting grooves 10 are formed at both axial end faces in the middle of the cutter head body 1 for mating with the mounting parts of the machine tool and driving the cutter head body 1 to rotate. Opposite bottom walls of the two mounting grooves 10 are provided with mating ports 101 penetrating the cutter head body 1 for power transmission, which can be a circular contour eccentrically arranged with the cutter head body 1 or other special-shaped structures. In this embodiment, a long strip shape is taken as an example for illustration.

[0040] Specifically, the cutting tools 3 are grouped according to the main tool holders 2. One group of cutting tools 3 is arranged for each main tool holder 2. A plurality of main tool holders 2 are spliced together to form an annular structure fitting the outer edge of the cutter head body 1, so as to drive a plurality of main tool holders 2 to move circumferentially through the rotation of the cutter head body 1, so that the cutting tools 3 can perform circumferential feed and milling operations. At the same time, since the impact force of the cutting tools 3 will be first applied to the main tool holders 2, when damage occurs due to relatively large impact force, it is mostly the main tool holders 2 that are damaged. At this time, only the main tool holders 2 at the corresponding positions need to be replaced, and there is no need to disassemble the entire cutter head body 1 for replacement and maintenance. On the one hand, it can significantly reduce the maintenance cost, and on the other hand, it can also significantly optimize the maintenance efficiency.

[0041] Refer to Figure 1 and Figure 3 , an installation ring groove 11 is formed at the outer edge of the cutter head body 1, so that one end face of the outer edge of the cutter head body 1 along the axial direction has a stepped structure, and the installation ring groove 11 extends circumferentially around the center of the cutter head body 1. The cross-sectional contour of the main tool holder 2 along the radial direction of the cutter head body 1 is T-shaped for lapping and mating with the installation ring groove 11 on the cutter head body 1, that is, the vertical part and one of the horizontal parts of the T-shaped cross-sectional contour of the main tool holder 2 are attached to the inner wall of the installation ring groove 11. Among them, clearance grooves 22 are provided at the fillet parts of the mutually mating structures of the installation ring groove 11 and the main tool holder 2, so that the main tool holder 2 and the cutter head body 1 are relatively closely attached, reducing the fitting error between the main tool holder 2 and the cutter head body 1 caused by processing defects, such as burrs or flash, resulting in incomplete fitting between the main tool holder 2 and the installation ring groove 11.

[0042] Refer to Figure 3 and Figure 4 , and in order to relatively stably fix the main tool holder 2 to the cutter head body 1, the main tool holder 2 is provided with a connection assembly 4. The connection assembly 4 includes at least two groups of connection bolts 41 threadedly connected to the cutter head body 1, which can be set to two groups, three groups or more groups. In this embodiment, two groups are taken as an example for illustration.

[0043] The same group contains two connecting bolts 41. Two connecting bolts 41 in one group are perpendicular to the rotation plane of the cutter head body 1, pass through the main tool holder 2, and are threadedly connected to the cutter head body 1. The other group of connecting bolts 41 is arranged at an angle with the rotation plane of the cutter head body 1, and the fastening direction is towards the center of the cutter head body 1. And there is a clearance fit between the main tool holder 2 and the connecting bolts 41. While effectively reducing the assembly requirements for the mutual cooperation of the main tool holders 2, by pressing the main tool holders 2 onto the mounting ring groove 11 in two different directions, it can make the main tool holders 2 relatively stably bear the impact force during the cutting process of the tool 3. Especially when the tool 3 is arranged on the outer wall of the main tool holder 2, it will cause the main tool holder 2 to have a certain torque relative to the cutter head body 1. At this time, the connecting bolts 41 inclined towards the inner side of the cutter head body 1 can be directly tightened through the axial tension, reducing the damage to the other group of connecting bolts 41 perpendicular to the cutter head body 1. At the same time, through the clearance fit, the main tool holder 2 has a margin for sliding relative to the cutter head body 1, reducing the possibility of directly impacting the connecting bolts 41 and causing damage.

[0044] In addition, in order to further optimize the impact force that the main tool holder 2 bears during the cutting process of the tool 3, the cutter head body 1 is provided with positioning grooves 13 corresponding to the main tool holders 2 one by one, which extend radially along the cutter head body 1 to the main tool holders 2, that is, the number of positioning grooves 13 is the same as the number of main tool holders 2. Among them, the positioning groove 13 has an arc-shaped structure on the end face of the cutter head body 1 facing the center.

[0045] Refer to Figure 3 and Figure 4 As shown in and, a positioning member 12 for positioning and limiting the main tool holder 2 is arranged in the positioning groove 13. The positioning member 12 includes a positioning block 121 and a positioning bolt 122. The positioning block 121 is clamped in the positioning groove 13, and one end of the positioning block 121 facing the center of the cutter head body 1 is adapted to the positioning groove 13. At the same time, one end of the positioning block 121 away from the center of the cutter head body 1 extends into the main tool holder 2 and has an interference fit. The positioning bolt 122 passes through the positioning block 121 and is threadedly connected to the cutter head body 1 to fix the positioning block 121.

[0046] In addition, the movement of the main tool holder 2 relative to the cutter head body 1 is directly restricted by the positioning block 121, and when the impact force is too large, it can be adaptively adjusted within the rotation range through the rotation of the positioning block 121. On the one hand, the situation of tool breakage is reduced, and on the other hand, the impact force can be transmitted to other main tool holders 2 that are not undergoing cutting for sharing. Among them, in order to make the positioning block 121 relatively conveniently installed in the positioning groove 13, avoidance grooves 131 are provided at the corners of the positioning groove 13 in the part of the main tool holder 2.

[0047] Refer to Figure 4 and Figure 5Meanwhile, on the outer wall of the vertical part of the T-shaped cross-section contour of the main tool holder 2, on the side far from the tool disc body 1, there is a mounting surface 21 formed with an arc-shaped structure that extends outward toward the horizontal part, and a set of tools 3 are fixedly installed on this mounting surface 21 for milling straight edges. In addition, on the outer wall of the T-shaped cross-section contour of the main tool holder 2, on the side far from the vertical part and the tool disc body 1, another mounting surface 21 is formed by cutting, and a set of tools 3 are also provided for slope machining. Of course, in other embodiments, only one of the mounting surfaces 21 may be provided, or corresponding mounting surfaces 21 may be formed at other positions according to the processing requirements.

[0048] A number of tool grooves 211 for fixedly installing the tools 3 are formed on the mounting surface 21. The tools 3 are clamped and bolt-fixed in the tool grooves 211. The tools 3 on the main tool holder 2 are distributed in a staggered manner both circumferentially along the tool disc body 1 and from the inside to the outside. Moreover, the cutting edges of the adjacent tools 3 on the main tool holder 2 partially overlap along the circumferential feed path, so that when cutting, the feed of the tools 3 at different positions can be transitioned relatively smoothly, reducing the situation of excessive impact force.

[0049] The distribution path of the tool grooves 211 on the same main tool holder 2 is in a V shape, so that the main tool holder 2 can generate impact forces at different angles during cutting. The mounting surface 21 is provided with chip evacuation grooves 212 communicating with the tool grooves 211, and the chip evacuation grooves 212 are used to discharge the chips to the outside of the main tool holder 2.

[0050] The implementation principle of the embodiment of the present application is as follows: When in use, since the main tool holder 2 is modularly arranged and detachable relative to the tool disc body 1, when the impact force during the cutting process of the tool 3 is too large and causes damage to the main tool holder 2, only the corresponding main tool holder 2 needs to be directly replaced, rather than removing the tool disc body 1 relative to the machine tool and replacing the whole. On the one hand, the maintenance cost is significantly reduced; on the other hand, only the damaged main tool holder 2 needs to be replaced, and compared with replacing the whole tool disc body 1, the efficiency is significantly improved.

[0051] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A large-diameter milling cutter, characterized in that: It includes a cutter head body (1), several main tool holders (2) arranged around the cutter head body (1), and several cutting tools (3); Several of the main tool holders (2) are spliced together into an annular structure and detachably fixed to the cutter head body (1); The main tool holder (2) is formed with at least one mounting surface (21), and the cutting tool (3) is fixedly installed on the mounting surface (21) for cutting and processing products.

2. The face milling cutter according to claim 1, wherein: An installation ring groove (11) for lapping and mating with the main tool holder (2) is formed on the outer edge of the cutter head body (1). The main tool holder (2) is provided with a connection component (4) for connecting the cutter head body (1). The connection component (4) includes at least two groups of connection bolts (41) threadedly connected to the cutter head body (1), and different groups of the connection bolts (41) fasten the main tool holder (2) to the inner wall of the installation ring groove (11) from different directions.

3. The large-diameter milling cutter according to claim 2, characterized in that: There are two groups of the connection bolts (41). One group of the connection bolts (41) fastens the main tool holder (2) to the inner wall of the installation ring groove (11) along the direction perpendicular to the cutter head body (1), and the other group of the connection bolts (41) is threadedly connected to the cutter head body (1) along the direction intersecting with the rotation plane of the cutter head body (1) and towards the center of the cutter head body (1).

4. A large-diameter milling cutter according to claim 1, characterized in that: Relief grooves (22) are provided at the fillet parts of the mutually mating structures of the installation ring groove (11) and the main tool holder (2).

5. The face milling cutter according to claim 2, wherein: The cutter head body (1) is provided with several positioning parts (12) corresponding to at least one-to-one with the main tool holders (2). The cutter head body (1) is provided with positioning grooves (13) corresponding to the positioning parts (12) and extending to the main tool holders (2); The positioning part (12) includes a positioning block (121) and a positioning bolt (122) for fixing the positioning block (121) to the cutter head body (1). The positioning block (121) is clamped in the positioning groove (13).

6. The face milling cutter according to claim 5, wherein: The positioning groove (13) is in an arc-shaped structure on the end face of the cutter head body (1), and relief grooves (131) are provided at the corners of the part of the positioning groove (13) located in the main tool holder (2).

7. A large-diameter milling cutter according to any one of claims 1-5, characterized in that: There are two mounting surfaces (21), and the two mounting surfaces (21) are arranged at an angle. One of the mounting surfaces (21) is arranged at the outer edge position of the main tool holder (2) and cooperates with the mounting surfaces (21) of other main tool holders (2) to form an annular surface structure. The other mounting surface (21) is arranged on the end face of the main tool holder (2) along the axial direction of the cutter head body (1) and cooperates with the other mounting surfaces (21) of other main tool holders (2) to form an annular surface structure.

8. A large-diameter milling cutter according to any one of claims 1-5, characterized in that: The mounting surface (21) is formed with several tool grooves (211) for fixedly installing the cutting tools (3). The cutting tools (3) are clamped and fixed in the tool grooves (211). The cutting tools (3) on the main tool holder (2) are staggered both in the circumferential direction of the cutter head body (1) and from the inside to the outside, and the cutting edges of the adjacent cutting tools (3) on the main tool holder (2) partially overlap along the circumferential feed path.

9. The face milling cutter according to claim 7, wherein: The distribution path of the tool grooves (211) on the same main tool holder (2) is in a V shape.

10. A large-diameter milling cutter according to claim 7, characterized in that: The mounting surface (21) is provided with a chip evacuation groove (212) communicating with the tool groove (211), and the chip evacuation groove (212) is used to discharge chips to the outside of the main tool holder (2).

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