Blade and tool apron for ball thread machining

Abstract

The invention provides a blade and a tool apron for ball thread machining, and belongs to the technical field of ball thread milling. The milling cutter blade is mounted in the cutter blade mounting position of the cutter holder, and the cutter holder drives the milling cutter blade to rotate, so that milling of ball threads is realized; moreover, the milling blade comprises a plurality of blade parts which are uniformly distributed on the fixed body, each blade part comprises a top blade edge which is arranged on a central line in the thickness direction of the fixed body, second blade edges are connected to two sides of the top blade edge, and each second blade edge is further connected with a third blade edge; according to the ball milling cutter, a plurality of contour edges on the cross section of a ball thread are milled at the same time, the machining precision is ensured, cooperation of other machining procedures is reduced, the machining efficiency is improved, a welding cutter does not need to be adopted for machining, the other blade part can be used for continuous machining by rotating the milling cutter blade under the condition that one blade part is damaged, and the machining efficiency is improved. The whole cutter does not need to be replaced, the machining cost is lower, and large-batch production and manufacturing of the ball nut are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of ball thread milling, and in particular to a blade and a cutter seat for ball thread milling. Background Art

[0002] Ball nuts are usually used in conjunction with ball screws. The ball screws are provided with ball external threads, and the ball nuts are provided with ball internal threads. When the ball nut is sleeved on the ball screw, the ball external threads and ball internal threads cooperate with each other and a number of balls are provided between the two. Since the transmission process is achieved through balls, it has less friction resistance and is often used in processing equipment such as machine tools. It has a broad market prospect, resulting in the industry's increasing attention to the processing of ball threads.

[0003] At present, the ball thread processing method for ball nuts in the industry is usually obtained by welding tool turning, such as the lathe equipment for deep hole ball thread hard turning disclosed in patent CN209334733U, which clamps the ball nut through a chuck mechanism, and drives the ball nut to rotate while realizing linear feeding. In addition, a moving seat is provided on the tool feeding mechanism, and a tool rod fixing seat is provided on the moving seat. One end of the tool rod is fixed on the tool rod fixing seat, and the other end of the tool rod passes through the inner hole of the ball nut. A cutting blade is installed on the tool rod. During processing, the chuck mechanism clamps and drives the ball nut to rotate and linearly feed, and the cutting blade on the tool rod realizes the turning of the ball thread on the inner wall of the inner hole of the ball nut. Although the above equipment can complete the processing, due to the defects of small cutting amount and low precision in the traditional turning processing method, a large margin will be reserved for grinding during the processing, and grinding is more time-consuming, resulting in low overall processing efficiency and high cost. In addition, in order to improve turning accuracy, the industry usually uses sliding integrated welded tools to achieve turning processing. Although this improves the processing accuracy, the overall tool needs to be replaced as a whole after the cutting edge is damaged. Not only is the tool change frequency high, it also increases the processing cost, and it still cannot meet the mass production and manufacturing needs of ball nuts. Summary of the invention

[0004] In view of the above-mentioned problems existing in the prior art, the present invention aims to provide a blade and a tool holder for ball thread processing, which adopts a milling cutter as a processing tool, and is composed of a milling blade and a tool holder. A blade mounting position is arranged at one end of the tool holder, and the milling blade comprises a plurality of cutting portions, and the plurality of cutting portions are evenly distributed in a circular array, each cutting portion has a cutting edge, and each cutting edge comprises a top cutting edge, two second cutting edges and two third cutting edges, and the top cutting edge is arranged on the center line of the thickness direction of the milling blade, and the two sides of the top cutting edge are respectively connected to the second cutting edges, and the end of each second cutting edge away from the top cutting edge is connected to a third cutting edge, and the two second cutting edges and the two third cutting edges are symmetrically arranged about the center line of the thickness direction of the milling blade, so as to realize simultaneous processing of multiple contour edges of the ball thread and ensure milling accuracy. In addition, after one cutting portion is damaged, the milling blade can be rotated to use another cutting portion for processing, so as to avoid the high cost problem caused by the overall replacement of the tool, and is conducive to the mass production of ball nuts.

[0005] The specific technical solutions are as follows: A blade for ball thread processing has the following characteristics: the blade is a milling blade, the milling blade includes a fixed body and a plurality of cutting edges, the fixed body is a flat block, a fixing hole is provided in the center of the fixed body, the plurality of cutting edges are arranged on the outer wall of the fixed body, and the plurality of cutting edges are distributed in a ring array with the hole axis of the fixing hole as the axis center, the cutting edges and the fixed body are an integrated structure, a first base surface is provided on the side wall of the fixed body and between two adjacent cutting edges, both ends of the fixed body are planes serving as second base surfaces, a cutting edge is provided on the side of each cutting edge facing away from the fixed body, each cutting edge includes a top cutting edge, two second cutting edges and two third cutting edges, and the middle part of the top cutting edge is located on the center line of the thickness direction of the fixed body, a second cutting edge is connected to both sides of the top cutting edge, and a third cutting edge is connected to the end of each second cutting edge facing away from the top cutting edge, and the two second cutting edges and the two third cutting edges are symmetrically arranged about the center line where the top cutting edge is located.

[0006] The above-mentioned insert for ball thread machining has three cutting edges, and the overall structure of the cutting edges and the fixed body is arranged in an equilateral triangle, with the three cutting edges being located at three vertex angles respectively.

[0007] In the above-mentioned insert for ball thread machining, the angle between the front cutting surface of the cutting edge of the milling insert and the first base surface is the rake angle, and the range of the rake angle is 18-24°.

[0008] The above-mentioned insert for ball thread machining, wherein the back cutting surface of the cutting edge of the milling insert is inclined toward the center line of the thickness direction, and the angle between each back cutting surface and the second base surface is a back angle, and the range of the back angle is 3-5°.

[0009] The above-mentioned blade for ball thread processing, wherein an avoidance groove is provided on the first base surface of the fixed body and between the front cutting edge of the corresponding cutting edge portion, one side of the avoidance groove is connected to the front cutting edge, and the other end of the avoidance groove is arranged at an angle to the first base surface, and the angle range between the avoidance groove and the first base surface is 50-60°.

[0010] A tool holder for ball thread processing, used for installing the above-mentioned ball thread processing blade, has the following characteristics: it includes a clamping end and a tool rod, the tool rod and the clamping end are arranged along one direction, one end of the tool rod is installed on one end of the clamping end, and a blade mounting position is provided at the end of the tool rod away from the clamping end, the milling cutter is installed in the blade mounting position and at least one cutting edge extends out of the tool rod, the hole axis of the fixing hole of the milling cutter is consistent with the arrangement direction of the tool rod and the clamping end, and the blade mounting position is a "V"-shaped groove, and the two side walls of the "V"-shaped groove respectively form a first mating surface corresponding to the first base surface, and the groove bottom surface of the "V"-shaped groove forms a second mating surface corresponding to the second base surface.

[0011] In the above-mentioned tool holder for ball thread processing, an avoidance notch is provided on the outer wall of one end of the tool rod where the blade mounting position is provided and in front of the front cutting surface of the protruding cutting edge portion.

[0012] The above-mentioned tool holder for ball thread processing, wherein a chip guide block is installed in the avoidance gap, a chip guide groove is provided on the side of the chip guide block away from the clamping end, the chip guide groove is arranged in a spiral along the arrangement direction of the tool rod, and the starting point of the chip guide groove extends to the front cutting edge.

[0013] The above-mentioned tool holder for ball thread processing also includes a lateral adjustment component, which is installed on the clamping end, the tool rod is installed on the lateral adjustment component, and the lateral adjustment component performs telescopic movement on the clamping end along the plane where the front cutting edge of the blade is located.

[0014] The above-mentioned tool holder for ball thread processing, wherein the lateral adjustment component includes an adjusting member, a limit member, an adjusting push block, an adjusting spring and an end cover, the clamping end is arranged in a cylindrical shape, and an end cover is provided at the barrel mouth of the end of the clamping end away from the tool rod, and two adjusting grooves are symmetrically provided on the inner wall of the barrel of the clamping end and are arranged along the axial direction of the clamping end, the bottom wall of each adjusting groove is arranged in an inclined surface, and the inclination directions of the bottom walls of the two adjusting grooves are opposite, and an adjusting push block is slidably provided in each adjusting groove, one side wall of the adjusting push block is an inclined surface and fits with the bottom wall of the corresponding adjusting groove, and the other side surface of the adjusting push block is an adjustment plane arranged along the axial direction of the clamping end, and one end of the tool rod is inserted into the The tool rod is connected to the clamping end and extends between the two adjusting push blocks, and the two sides of one end of the tool rod extending between the two adjusting push blocks are respectively fitted with the adjusting planes of the two adjusting push blocks. At the same time, a limit piece is arranged on the side wall of the end of the clamping end away from the end cover. The limit piece is arranged along the radial direction of the clamping end and is symmetrically arranged on both sides of the clamping end. One end of the limit piece extends into the clamping end and respectively abuts against the two sides of the tool rod and the two adjusting planes. In addition, two adjusting pieces arranged along the adjusting groove are installed on the end cover. The two adjusting pieces abut against the two adjusting push blocks respectively. At the same time, one side of the two adjusting push blocks away from the two adjusting pieces is respectively abutted with an adjusting spring, and one end of the adjusting spring away from the adjusting push block abuts against the inner wall of the tube of the clamping end.

[0015] The positive effects of the above technical solution are: The above-mentioned blade and tool holder for ball thread processing are provided with a milling blade and installed on the tool holder, and the milling blade includes a fixed body and a plurality of blade portions arranged on the outside of the fixed body, each blade portion has a cutting edge, and each cutting edge includes a top cutting edge, two second cutting edges and two third cutting edges, the middle of the top cutting edge is located on the center line of the thickness direction of the fixed body, the two second cutting edges are respectively connected to the two sides of the top cutting edge, and each second cutting edge is also connected to a third cutting edge, and the two second cutting edges and the third cutting edges are symmetrically arranged about the center line of the thickness direction of the fixed body, thereby realizing the simultaneous milling of multiple contour edges on the cross section of the ball thread, ensuring the processing accuracy, and eliminating the need for coordinated processing of other processing steps, thereby improving the processing efficiency. In addition, compared with a welding knife, when one cutting edge is damaged, the milling blade can be directly rotated and processing can be continued through other cutting edges, without the need to replace the tool as a whole, thereby reducing the processing cost and facilitating the mass production of ball nuts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural diagram showing a perspective of an embodiment of a ball thread machining insert of the present invention; Figure 2 A structural diagram of another perspective of an embodiment of a ball thread machining insert of the present invention; Figure 3It is a schematic diagram of a ball thread machining blade and a blade holder after installation of the present invention; Figure 4 A cross-sectional view of a ball thread machining blade and a blade holder after installation according to the present invention; Figure 5 It is a schematic diagram of a tool rod of a tool holder for ball thread machining of the present invention; Figure 6 It is a cross-sectional view of a clamping end of a tool holder for ball thread machining of the present invention; Figure 7 The present invention is a structural diagram of the clamping end of a tool holder for ball thread machining.

[0017] In the accompanying drawings: 1. milling blade; 11. fixed body; 12. blade; 13. front angle; 14. back angle; 15. avoidance groove; 111. fixing hole; 112. first base surface; 113. second base surface; 121. cutting edge; 1211. top cutting edge; 1212. second cutting edge; 1213. third cutting edge; 2. tool holder; 21. clamping end; 22. tool rod; 211. adjustment groove; 212. strip hole; 221. blade mounting position; 222. avoidance notch; 223. chip guide block; 224. limit stop edge; 2211. first mating surface; 2212. second mating surface; 2231. chip guide groove; 3. lateral adjustment component; 31. adjustment member; 32. limit member; 33. adjustment push block; 34. adjustment spring; 35. end cover; 331. adjustment plane. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments are combined with the attached Figure 1 To Attachment Figure 7 The technical solution provided by the present invention is described in detail, but the following content is not intended to limit the present invention.

[0019] Figure 1 A structural diagram of an embodiment of a ball thread machining insert according to the present invention from one perspective; Figure 2 FIG. 2 is a structural diagram of another embodiment of a ball thread machining insert of the present invention from another perspective. Figure 1 and Figure 2 As shown, the ball thread machining blade provided in this embodiment is a milling blade 1, and the ball thread of the ball nut is subsequently milled to ensure machining accuracy, thereby providing conditions for improving machining efficiency and reducing the overall replacement frequency of the tool.

[0020] Specifically, the milling blade 1 includes a fixed body 11 and a plurality of blades 12. At this time, the fixed body 11 is a flat block, so that the fixed body 11 has at least two planes as end faces, which provides conditions for the subsequent formation of the second base surface 113 and close to the tool holder 2, ensuring that the milling process can be completed stably. At this time, a through fixing hole 111 is also opened in the center of the fixed body 11, so that the milling blade 1 can be installed on the tool holder 2 after passing the bolt through the fixing hole 111, which is convenient for the subsequent rotation of the milling blade 1 and changing different blades 12 for milling. In addition, a plurality of blades 12 are arranged on the outer wall of the fixed body 11, and the plurality of blades 12 are distributed in a circular array with the hole axis of the fixing hole 111 as the axis, so that the structure of the milling blade 1 is more uniform, ensuring that each blade 12 can maintain a consistent processing effect when processing. In addition, the blade 12 and the fixed body 11 are an integrated structure, which ensures the structural strength of the milling blade 1, and the structure is more stable and the processing accuracy is higher. In addition, a first base surface 112 is provided on the side wall of the fixed body 11 and between two adjacent cutting edges 12. At the same time, both ends of the fixed body 11 are planes serving as second base surfaces 113, so that when the milling blade 1 is installed on the tool holder 2, positioning and limiting can be achieved through the first base surface 112 and the second base surface 113, ensuring that the milling blade 1 can be stably installed on the tool holder 2, meeting the milling processing requirements and ensuring the processing accuracy. In addition, a cutting edge 121 is provided on the side of each cutting edge 12 facing away from the fixed body 11, and each cutting edge 121 includes a top cutting edge 1211, two second cutting edges 1212 and two third cutting edges 1213. At this time, the middle of the top cutting edge 1211 is located on the center line of the thickness direction of the fixed body 11, and the two sides of the top cutting edge 1211 are respectively connected to a second cutting edge 1212, and each second cutting edge 1212 is connected to a third cutting edge at one end facing away from the top cutting edge 1211. 1213, and the two second edges 1212 and the two third edges 1213 are symmetrically arranged about the center line of the top edge 1211, so that each edge 121 has at least five edges, which just meet the profile of the cross-sectional shape of the ball thread of the ball nut, so that when the inner wall of the ball nut is milled by the milling blade 1, multiple contour edges on the cross section of the ball thread can be milled at the same time, ensuring the processing accuracy, without the need for other processing steps, and improving the processing efficiency. In addition, since the milling blade 1 has several blades 12 and can be replaced, compared with traditional welding knives, when one blade 12 is damaged, the milling blade 1 can be directly rotated and the processing can be continued through other blades 12, without the need to replace the tool as a whole, reducing the processing cost and facilitating the mass production of ball nuts.

[0021] More specifically, three blades 12 are provided, and the overall structure of the blades 12 and the fixed body 11 is arranged in an equilateral triangle, so that the overall stability of the milling blade 1 is higher. In addition, after the milling blade 1 is installed on the tool holder 2, one of the blades 12 is extended for milling processing, and there are two blades 12 left to cooperate with the tool holder 2 to limit, so that the milling blade 1 can be installed on the tool holder 2 more stably, meet the milling processing requirements, and ensure the processing accuracy, so there is no need to set up another processing technology to cooperate with the processing, thereby improving the processing efficiency. In addition, the three blades 12 are respectively located at three vertices, so that the position and state of each blade 12 on the fixed body 11 are the same, thereby providing conditions for the subsequent replacement of the damaged blade 12 by other blades 12 to complete the milling process, and the structural design is more reasonable.

[0022] More specifically, the angle between the front cutting surface of the cutting edge 12 of the milling blade 1 and the first base surface 112 is set to be the front angle 13. At this time, the range of the front angle 13 is set to 18-24°. Preferably, the front angle 13 is 22°, which ensures that a better feed angle can be provided during milling processing and the cutting efficiency is higher. At the same time, it can also reduce the impact on the ball nut itself and avoid damage to the cutting edge 121, thereby extending the service life of the milling blade 1 while ensuring the milling processing accuracy.

[0023] More specifically, the back cutting surface of the blade 12 of the fixed milling blade 1 is tilted toward the center line of the thickness direction, and the angle between each back cutting surface and the second base surface 113 is set to be a back angle 14. At this time, the range of the back angle 14 is set to 3-5°. Preferably, the back angle 14 is 4°, which can not only ensure the structural strength of the blade 12 and avoid the problem of blade 12 breakage during cutting, but also avoid other parts of the blade 12 except the cutting edge 121 from contacting the ball nut, ensuring that the processing of the ball thread only affects the cutting edge 121 of the blade 12, thereby ensuring the processing quality and making the structural design more reasonable.

[0024] More specifically, an avoidance groove 15 is provided on the first base surface 112 of the fixed body 11 and between the front cutting edge of the corresponding blade 12. At this time, one side of the avoidance groove 15 is connected to the front cutting edge, and the other end of the avoidance groove 15 is arranged at an angle to the first base surface 112. In addition, the angle range between the avoidance groove 15 and the first base surface 112 is set to 50-60°. Preferably, the angle between the avoidance groove 15 and the first base surface 112 is 55°. The avoidance groove 15 can facilitate the processing of the front cutting edge of the blade 12 itself, and at the same time, it can reserve a discharge space for the waste chips generated by the subsequent milling process, thereby avoiding the cutting interference problem caused by the accumulation of waste chips and ensuring the processing quality. In addition, it can also avoid the problem that the first base surface 112 is excessively extended during the processing and easily collides with the ball nut to be processed, and the structural design is more reasonable.

[0025] Figure 3It is a schematic diagram of a ball thread machining blade and a blade holder after installation of the present invention; Figure 4 This is a cross-sectional view of a ball thread machining blade and a blade holder after installation of the present invention. Figure 3 and Figure 4 As shown, a ball thread processing tool holder 2 provided by the present invention is used to install the above-mentioned ball thread processing blade. At this time, the ball thread processing tool holder 2 also includes a clamping end 21 and a tool rod 22. The milling blade 1 is installed through the tool rod 22, and the tool rod 22 is installed on the drive shaft through the clamping end 21, so as to meet the milling processing requirements. In addition, the tool rod 22 and the clamping end 21 are arranged in one direction, and one end of the tool rod 22 is installed on one end of the clamping end 21. In addition, a blade mounting position 221 is provided at one end of the tool rod 22 away from the clamping end 21, and the milling blade 1 is installed in the blade mounting position 221 and at least one blade portion 12 extends out of the tool rod 22, so that when milling is performed, the power of the drive shaft is transmitted to the tool rod 22 through the clamping end 21, and the milling blade 1 is driven to rotate through the tool rod 22, and the blade portion 12 of the milling blade 1 extending out of the tool rod 22 contacts the inner wall of the ball nut and completes the milling process. In addition, the hole axis of the fixing hole 111 of the milling blade 1 is consistent with the arrangement direction of the tool bar 22 and the clamping end 21, so that after the milling blade 1 is installed on the tool seat 2, its blade 12 is arranged along the tangent direction of the tool bar 22 or a direction close to the tangent direction, so that the ball nut can be milled when the tool seat 2 drives the milling blade 1 to rotate. In addition, the blade installation position 221 for installing the milling blade 1 is a "V"-shaped groove, and the two side walls of the "V"-shaped groove respectively form a first matching surface 2211 corresponding to the first base surface 112, and the groove bottom surface of the "V"-shaped groove forms a second matching surface 2212 corresponding to the second base surface 113, so that after the milling blade 1 is installed in the blade installation position 221, the milling blade 1 can have at least three faces for positioning and limiting from different directions, ensuring the accuracy of the installation position of the milling blade 1 and the stability after installation, thereby ensuring the processing accuracy and improving the processing efficiency.

[0026] More specifically, an avoidance notch 222 is provided on the outer wall of one end of the tool rod 22 where a blade mounting position 221 is provided and in front of the front cutting edge of the protruding cutting edge 12. The avoidance notch 222 provides a sufficiently large cutting space in front of the cutting edge 121 of the cutting edge 12, which can prevent the problem of tool collision and quickly discharge the waste chips generated by cutting, making processing more convenient.

[0027] More specifically, a chip guide block 223 can be further installed in the avoidance gap 222. At this time, a first connecting hole is opened on the avoidance gap 222, and a second connecting hole is opened on the chip guide block 223. The first connecting hole and the second connecting hole can be connected by passing screws through, thereby realizing the disassembly and installation of the chip guide block 223 on the tool rod 22 to meet different processing requirements and have better adaptability. In addition, the hidden installation of the chip guide block 223 on the tool rod 22 is also realized to prevent the chip guide block 223 from interfering with the cutting. In addition, a chip guide groove 2231 is provided on the side of the chip guide block 223 away from the clamping end 21, and the chip guide groove 2231 is spirally arranged along the arrangement direction of the tool rod 22, and the starting point of the chip guide groove 2231 is extended to the front cutting edge, so that when the cutting amount of the milling process is large, the thickness of the waste chips generated by the cutting is thicker, the structural strength is higher, and it is very easy to get stuck between the blade 12 and the workpiece and affect the processing accuracy. At this time, the chip guide groove 2231 can immediately guide the waste chips to the side away from the blade 12, so as to push the waste chips and ensure that the waste chips can be discharged immediately. The structural design is more reasonable. When the cutting amount is small, the chip guide block 223 can be removed to reduce the weight of the end of the tool rod 22, so as to facilitate the high-pressure gas from the outside to blow into the avoidance gap 222 to blow away the waste chips. That is, different chip removal methods are selected for different cutting amounts, and the structural flexibility is higher and the adaptability is better.

[0028] Figure 5 It is a schematic diagram of a tool rod of a tool holder for ball thread machining of the present invention; Figure 6 It is a cross-sectional view of a clamping end of a tool holder for ball thread machining of the present invention; Figure 7 FIG. 1 is a structural diagram of a clamping end of a tool holder for ball thread machining of the present invention. Figures 3 to 7 As shown, a lateral adjustment component 3 is also provided on the clamping end 21 of the tool holder 2, and the tool rod 22 is installed on the lateral adjustment component 3, and the lateral adjustment component 3 can perform telescopic movement along the plane where the front cutting surface of the cutting edge 12 is located on the clamping end 21, that is, through the adjustment of the lateral adjustment component 3, the cutting edge 12 of the milling cutter blade 1 can be extended or retracted while the position of the clamping end 21 remains unchanged, thereby meeting the processing requirements of ball nuts with different inner diameters, without the need to develop the tool holder 2 specifically, the structure is more flexible, and the utilization rate is higher.

[0029] More specifically, the lateral adjustment assembly 3 includes an adjustment member 31, a stopper 32, an adjustment push block 33, an adjustment spring 34, and an end cap 35. At this time, the clamping end 21 is arranged in a cylindrical shape, so that the clamping end 21 has a cylindrical inner cavity running through both ends thereof, which provides space for the installation of the lateral adjustment assembly 3, and also ensures that the outer surface of the clamping end 21 is flat, meeting the traditional clamping requirements. An end cap 35 is provided at the end of the clamping end 21 away from the shank 22, and one end of the inner cavity of the clamping end 21 is closed by the end cap 35, providing a carrier for the subsequent installation of the adjustment member 31. In addition, two adjustment grooves 211 are symmetrically arranged on the inner wall of the tube of the clamping end 21 and are arranged along the axial direction of the clamping end 21. Moreover, the bottom wall of each adjustment groove 211 is arranged in an inclined surface, and the bottom wall of each adjustment groove 211 is arranged at an angle with the axial direction of the clamping end 21 in the axial direction of the clamping end 21, so that the groove depth of the adjustment groove 211 changes continuously in the axial direction of the clamping end 21, which provides conditions for the subsequent adjustment push block 33 to move in the radial direction of the clamping end 21. In addition, the inclination directions of the bottom walls of the two adjustment grooves 211 are opposite, so that when the corresponding adjustment push blocks 33 in the two adjustment grooves 211 move in the opposite direction in the adjustment grooves 211, the two adjustment push blocks 33 can move in the same direction in the radial direction of the clamping seat. At this time, an adjusting push block 33 is slidably arranged in each adjusting groove 211, and one side wall of the adjusting push block 33 is an inclined surface and fits with the bottom wall of the corresponding adjusting groove 211, and the other side surface of the adjusting push block 33 is an adjusting plane 331 arranged along the axial direction of the clamping end 21, so that when the adjusting push block 33 is slid axially along the clamping end 21 in the corresponding adjusting groove 211, under the interaction between the adjusting groove 211 and the inclined surface of the adjusting push block 33, the adjusting plane 331 of the adjusting push block 33 can be radially moved along the clamping end 21, so that the distance between the adjusting plane 331 and the axis of the clamping end 21 can be changed, which provides conditions for the subsequent radial movement of the tool rod 22 along the clamping end 21, thereby realizing the extension or retraction of the cutting edge 12 of the milling cutter 1. In addition, one end of the tool rod 22 is inserted into the clamping end 21 from the clamping end 21 away from the end where the end cover 35 is provided and extends between the two adjustment push blocks 33, so that the installation position of the tool rod 22 on the clamping end 21 can change with the movement of the adjustment push block 33, thereby meeting the adjustment requirements of extending or retracting the cutting edge 12 of the milling cutter 1.In addition, the two sides of the end where the tool rod 22 is extended between the two adjusting push blocks 33 are respectively fitted with the adjustment planes 331 of the two adjusting push blocks 33, so that each adjusting push block 33 can stably push the tool rod 22 to move radially along the clamping end 21. Preferably, the two sides where the tool rod 22 is extended between the two adjusting push blocks 33 are also arranged in a plane to better fit the adjustment plane 331. At the same time, it also prevents the problem that the adjustment direction of the tool rod 22 is inconsistent with the extension or retraction direction of the cutting edge 12 of the milling cutter 1 due to the circumferential rotation of the tool rod 22, thereby ensuring that the ultimate purpose of the adjustment is to adjust the extension distance of the cutting edge 12, thereby adapting to the processing of ball nuts with different inner diameters. In addition, at the same time, the limit member 32 is set on the side wall of the end of the clamping end 21 away from the end cover 35, and the limit member 32 is arranged along the radial direction of the clamping end 21 and symmetrically arranged on both sides of the clamping end 21, and one end of the limit member 32 extends into the clamping end 21 and respectively abuts against the two sides of the tool rod 22 and the two adjustment planes 331, so that one end of the section of the tool rod 22 extending into the clamping end 21 can be limited by the adjustment push block 33, and the other end can be limited by the limit member 32, ensuring that the tool rod 22 can meet the adjustment requirements after being installed on the clamping end 21, and can also ensure installation stability and reliability, and ensure processing accuracy. In addition, two adjusting members 31 are mounted on the end cover 35, both arranged along the adjusting groove 211, and the two adjusting members 31 are respectively pressed against the two adjusting push blocks 33, so that the adjusting direction of the two adjusting members 31 is the axial direction of the clamping end 21, which is consistent with the moving direction of the adjusting push block 33 in the adjusting groove 211, providing conditions for the subsequent pushing of the adjusting push block 33 to slide in the adjusting groove 211. At the same time, the two adjusting push blocks 33 are respectively pressed against an adjusting spring 34 on one side away from the two adjusting members 31, and the end of the adjusting spring 34 away from the adjusting push block 33 is pressed against the inner wall of the tube of the clamping end 21, so that the adjusting spring 34 and the adjusting member 31 are respectively located on both sides of the adjusting push block 33, so that when the adjusting push block 33 is pushed by the adjusting member 31 and the adjusting push block 33 is released in the reverse direction, the adjusting push block 33 can be reset in the reverse direction under the action of the adjusting spring 34, and the problem of the adjusting push block 33 being stuck and unable to be adjusted will not be caused.In addition, each adjusting push block 33 has an adjusting piece 31 and an adjusting spring 34 respectively corresponding to it. When adjusting, the adjusting piece 31 on the side where the blade 12 is extended or retracted is firstly released in the opposite direction to release the adjusting push block 33, so that the corresponding adjusting push block 33 moves toward the side of the end cover 35 under the action of the corresponding adjusting spring 34, so that the adjusting push block 33 moves toward the axis away from the clamping end 21. At the same time, the limiting piece 32 on the same side is released to reserve space for the blade 22 to move radially along the clamping end 21, and then the other limiting piece 32 is released. The adjusting member 31 is tightened and pushes the corresponding adjusting push block 33 to continue to move radially along the clamping end 21, so that the distance between the adjusting push block 33 and the axis of the clamping end 21 is reduced, and the limiting member 32 is tightened synchronously, so that the adjusting push block 33 and the limiting member 32 can push both ends of the tool rod 22 to one side of the axis of the clamping end 21, so that the distance between the axis of the tool rod 22 and the clamping end 21 changes, so that the blade 12 can be extended or retracted without changing the position of the clamping end 21, thereby meeting the adjustment requirements.

[0030] As a preferred embodiment, the knife rod 22 extends to one end inside the clamping end 21 and is provided with a limit stop edge 224 between the limit piece 32 and the adjusting push block 33. When the knife rod 22 is installed in place, one side of the limit stop edge 224 abuts against the limit piece 32, thereby preventing the knife rod 22 from escaping from the end of the clamping end 21 away from the end where the end cover 35 is provided, thereby improving the structural stability.

[0031] As a further preferred embodiment, the barrel mouth of the clamping end 21 away from the mounting end cover 35 is set as a strip hole 212, and the length direction of the strip hole 212 is perpendicular to the direction of the adjustment plane 331, so that when the adjusting push block 33 acts on the adjustment plane 331 to push the tool rod 22 to move in a direction perpendicular to the adjustment plane 331, the strip hole 212 can be used to guide the movement of the tool rod 22 to ensure that the tool rod 22 can move stably. At the same time, it can also ensure that the moving direction of the tool rod 22 is the plane where the front cutting surface of the blade 12 is located, which meets the requirement of adjusting the extension distance of the blade 12, and can also prevent errors in the adjustment direction and displacement of the tool rod 22 in other directions during use, which may cause the processed parts or milling blade 1 to be scrapped. The structural design is more reasonable.

[0032] As a further preferred embodiment, the end cover 35 can be installed in the barrel mouth of the clamping end 21 by means of a threaded connection, and the adjusting member 31 and the end cover 35 can also be threadedly connected, that is, the adjusting push block 33 can be pushed or loosened by twisting. In addition, the limit member 32 can also be threadedly connected to the clamping end 21, and the knife rod 22 can also be tightened or loosened by twisting the limit member 32, thereby meeting the use requirements of convenient adjustment.

[0033] The present embodiment provides a blade and a tool holder for ball thread processing, comprising a milling blade 1 and a tool holder 2; by installing the milling blade 1 in the blade installation position 221 of the tool holder 2, the tool holder 2 drives the milling blade 1 to rotate, thereby realizing the milling processing of the ball thread; and the milling blade 1 comprises a plurality of blade portions 12 evenly distributed on a fixed body 11, each blade portion 12 comprises a top blade edge 1211 arranged on the center line of the thickness direction of the fixed body 11, and both sides of the top blade edge 1211 are connected to a second blade edge 1212, and each second blade edge 1212 is also connected to There is a third cutting edge 1213, and the two second cutting edges 1212 and the two third cutting edges 1213 are symmetrically arranged about the center line in the thickness direction of the fixed body 11, thereby realizing the simultaneous milling of multiple contour edges on the cross section of the ball thread, ensuring the machining accuracy, reducing the coordination of other machining steps, and improving the machining efficiency. In addition, there is no need to use a welding tool for machining. When one of the cutting edges 12 is damaged, the milling cutter 1 can be rotated to use the other cutting edge 12 to continue machining. There is no need to replace the tool as a whole, and the machining cost is lower, which is conducive to the mass production of ball nuts.

[0034] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A ball thread machining insert, characterized in that: include: The blade is a milling blade, which includes a fixed body and a plurality of cutting edges. The fixed body is a flat block, and a fixing hole is provided in the center of the fixed body. The plurality of cutting edges are arranged on the outer wall of the fixed body, and the plurality of cutting edges are distributed in a circular array with the hole axis of the fixing hole as the axis center. The cutting edges and the fixed body are an integral structure. A first base surface is provided on the side wall of the fixed body and between two adjacent cutting edges. Both ends of the fixed body are planes serving as second base surfaces. A cutting edge is provided on the side of each cutting edge facing away from the fixed body, and each cutting edge includes a top cutting edge, two second cutting edges and two third cutting edges. In addition, the middle part of the top cutting edge is located on the center line of the thickness direction of the fixed body. A second cutting edge is connected to each of the two sides of the top cutting edge, and a third cutting edge is connected to each end of each second cutting edge facing away from the top cutting edge. The two second cutting edges and the two third cutting edges are symmetrically arranged about the center line where the top cutting edge is located.

2. The insert for ball thread machining according to claim 1, characterized in that: There are three blades, and the overall structure of the blade and the fixed body is arranged in an equilateral triangle, and the three blades are respectively located at three vertices.

3. The insert for ball thread machining according to claim 1, characterized in that: The angle between the front cutting surface of the cutting edge of the milling insert and the first base surface is a rake angle, and the range of the rake angle is 18-24°.

4. The insert for ball thread machining according to claim 1, characterized in that: The back cutting surfaces of the cutting edge of the milling insert are all inclined toward the center line in the thickness direction, and the angle between each back cutting surface and the second base surface is a back angle, and the range of the back angle is 3-5°.

5. The insert for ball thread machining according to claim 3, characterized in that: An avoidance groove is provided on the first base surface of the fixed body and between the front cutting edge of the corresponding cutting edge, one side of the avoidance groove is connected to the front cutting edge, and the other end of the avoidance groove is arranged at an angle to the first base surface, and the angle range between the avoidance groove and the first base surface is 50-60°.

6. A ball thread machining tool holder, used for mounting the ball thread machining insert according to any one of claims 3 to 5, characterized in that: It includes a clamping end and a tool rod, the tool rod and the clamping end are arranged in one direction, one end of the tool rod is installed on one end of the clamping end, and a blade mounting position is provided at the end of the tool rod away from the clamping end, the milling cutter is installed in the blade mounting position and at least one cutting edge extends out of the tool rod, the hole axis of the fixing hole of the milling cutter is consistent with the arrangement direction of the tool rod and the clamping end, and the blade mounting position is a "V"-shaped groove, and the two side walls of the "V"-shaped groove respectively form a first mating surface corresponding to the first base surface, and the groove bottom surface of the "V"-shaped groove forms a second mating surface corresponding to the second base surface.

7. The ball thread machining tool holder according to claim 6, characterized in that: An avoidance notch is provided on the outer side wall of one end of the knife rod where the blade mounting position is arranged and in front of the front blade surface extending out of the cutting edge.

8. The ball thread machining tool holder according to claim 7, characterized in that: A chip guide block is installed in the avoidance gap, and a chip guide groove is arranged on the side of the chip guide block away from the clamping end. The chip guide groove is arranged in a spiral along the arrangement direction of the tool rod, and the starting point of the chip guide groove extends to the front cutting edge.

9. The ball thread machining tool holder according to claim 6, characterized in that: It also includes a lateral adjustment component, which is installed on the clamping end, the tool rod is installed on the lateral adjustment component, and the lateral adjustment component performs telescopic movement on the clamping end along the plane where the front blade surface of the blade portion is located.

10. The ball thread machining tool holder according to claim 9, characterized in that: The lateral adjustment assembly includes an adjusting member, a limit member, an adjusting push block, an adjusting spring and an end cover, the clamping end is arranged in a cylindrical shape, the end cover is provided at the barrel mouth of the clamping end away from the tool rod, two adjusting grooves are symmetrically provided on the inner wall of the barrel of the clamping end and are arranged along the axial direction of the clamping end, the bottom wall of each adjusting groove is arranged in an inclined surface, and the inclination directions of the bottom walls of the two adjusting grooves are opposite, an adjusting push block is slidably provided in each adjusting groove, one side wall of the adjusting push block is an inclined surface and fits with the bottom wall of the corresponding adjusting groove, and the other side surface of the adjusting push block is an adjusting plane arranged along the axial direction of the clamping end, one end of the tool rod is inserted into the clamping end from the end of the clamping end away from the end cover and extends to the two adjusting push blocks The cam is an angular channel that is adapted to move the two guide wheels together with the guide wheels, and the two guide wheels are connected along the channel edge of the cam to form a circle with the two guide wheels connected thereto.

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