A ball thread machining blade and a blade holder

Abstract

The application provides a ball thread machining blade and a tool holder, and belongs to the technical field of ball thread milling machining.The milling blade is installed in the blade installation position of the tool holder, the tool holder drives the milling blade to rotate, and the milling of the ball thread is realized;the milling blade comprises a plurality of blade parts which are uniformly distributed on a fixed body, each blade part comprises a top blade edge which is arranged on the center line in the thickness direction of the fixed body, the two sides of the top blade edge are connected with second blade edges, each second blade edge is further connected with a third blade edge, the simultaneous milling of a plurality of profile edges on the cross section of the ball thread is realized, the machining precision is ensured, the cooperation of other machining procedures is reduced, the machining efficiency is improved, welding cutter machining is not needed, in the case that one blade part is damaged, another blade part can be used for continuous machining by rotating the milling blade, the tool is not needed to be replaced as a whole, the machining cost is lower, and the mass production and manufacturing of the ball nut are facilitated.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ball thread milling, and particularly relates to a blade and a tool holder for ball thread milling. BACKGROUND

[0002] A ball nut is usually used in cooperation with a ball screw, the ball screw is provided with a ball outer thread, the ball nut is provided with a ball inner thread, and when the ball nut is sleeved on the ball screw, the ball outer thread and the ball inner thread are matched and a plurality of balls are arranged between the ball outer thread and the ball inner thread. Since the transmission process is realized through the balls, the ball nut has small frictional resistance and is often used in machining equipment such as a machine tool, has a broad market prospect, and leads to increasing attention of the industry to ball thread milling.

[0003] At present, the ball thread milling of the ball nut is usually obtained by welding cutter turning, for example, the patent CN209334733U discloses a deep hole ball thread hard turning machining lathe device, the ball nut is clamped by a chuck mechanism, and the ball nut is driven to rotate while realizing linear feeding, in addition, a moving seat is arranged on a cutter feeding mechanism, the moving seat is provided with a tool bar fixing seat, one end of a tool bar is fixed to the tool bar fixing seat, the other end of the tool bar penetrates through the inner hole of the ball nut, a cutting blade is arranged on the tool bar, during machining, the chuck mechanism clamps and drives the ball nut to rotate and linearly feed, and the cutting blade on the tool bar realizes the turning of the ball thread on the inner wall of the inner hole of the ball nut. Although the above-mentioned device can complete the machining, since the traditional turning method has the defects of small cutting amount and low precision, a large allowance is reserved for grinding during the machining process, the grinding process is time-consuming, the overall machining efficiency is low, and the cost is high. In addition, in order to improve the turning precision, a slide-integrated welded cutter is usually used for turning, although the machining precision is improved, the integral cutter needs to be replaced in whole after the cutting edge is damaged, the cutter replacement frequency is high, the machining cost is increased, and the mass production and manufacturing requirements of the ball nut cannot be met. SUMMARY

[0004] In view of the above problems existing in the prior art, the present application provides a cutter blade for ball thread machining and a cutter holder, which adopts a milling cutter as a machining tool and is composed of a milling cutter blade and a cutter holder. One end of the cutter holder is provided with a cutter blade mounting position. The milling cutter blade includes a plurality of blade portions which are uniformly distributed in a ring array. Each blade portion is provided with a blade edge. Each blade edge includes a top blade edge, two second blade edges and two third blade edges. The top blade edge is arranged on the center line in the thickness direction of the milling cutter blade. The two sides of the top blade edge are respectively connected with the second blade edges. Each second blade edge is connected with a third blade edge at the end away from the top blade edge. The two second blade edges and the two third blade edges are symmetrically arranged about the center line in the thickness direction of the milling cutter blade. The simultaneous machining of multiple profile edges of the ball thread is realized, the milling precision is ensured, and after the damage of one blade portion, the milling cutter blade can be rotated for machining by another blade portion, thereby avoiding the high cost problem caused by the overall replacement of the tool and facilitating the mass production of ball nuts.

[0005] The specific technical solutions are as follows:

[0006] The cutter blade for ball thread machining has the following characteristics. The cutter blade is a milling cutter blade. The milling cutter blade includes a fixed body and a plurality of blade portions. The fixed body is a flat block. A through fixing hole is formed in the center of the fixed body. The plurality of blade portions are arranged on the outer side wall of the fixed body and are distributed in a ring array with the hole axis of the fixing hole as the axis. The blade portions and the fixed body are of an integral structure. A first base surface is arranged on the side wall of the fixed body between adjacent two blade portions. The two ends of the fixed body are flat surfaces as second base surfaces. Each blade portion is provided with a blade edge on the side away from the fixed body. Each blade edge includes a top blade edge, two second blade edges and two third blade edges. The middle part of the top blade edge is located on the center line in the thickness direction of the fixed body. The two sides of the top blade edge are respectively connected with a second blade edge. Each second blade edge is connected with a third blade edge at the end away from the top blade edge. The two second blade edges and the two third blade edges are symmetrically arranged about the center line of the top blade edge.

[0007] The cutter blade for ball thread machining has the following characteristics. The cutter blade is a milling cutter blade. The milling cutter blade includes a fixed body and a plurality of blade portions. The fixed body is a flat block. A through fixing hole is formed in the center of the fixed body. The plurality of blade portions are arranged on the outer side wall of the fixed body and are distributed in a ring array with the hole axis of the fixing hole as the axis. The blade portions and the fixed body are of an integral structure. A first base surface is arranged on the side wall of the fixed body between adjacent two blade portions. The two ends of the fixed body are flat surfaces as second base surfaces. Each blade portion is provided with a blade edge on the side away from the fixed body. Each blade edge includes a top blade edge, two second blade edges and two third blade edges. The middle part of the top blade edge is located on the center line in the thickness direction of the fixed body. The two sides of the top blade edge are respectively connected with a second blade edge. Each second blade edge is connected with a third blade edge at the end away from the top blade edge. The two second blade edges and the two third blade edges are symmetrically arranged about the center line of the top blade edge.

[0008] The cutter blade for ball thread machining has the following characteristics. The cutter blade is a milling cutter blade. The milling cutter blade includes a fixed body and a plurality of blade portions. The fixed body is a flat block. A through fixing hole is formed in the center of the fixed body. The plurality of blade portions are arranged on the outer side wall of the fixed body and are distributed in a ring array with the hole axis of the fixing hole as the axis. The blade portions and the fixed body are of an integral structure. A first base surface is arranged on the side wall of the fixed body between adjacent two blade portions. The two ends of the fixed body are flat surfaces as second base surfaces. Each blade portion is provided with a blade edge on the side away from the fixed body. Each blade edge includes a top blade edge, two second blade edges and two third blade edges. The middle part of the top blade edge is located on the center line in the thickness direction of the fixed body. The two sides of the top blade edge are respectively connected with a second blade edge. Each second blade edge is connected with a third blade edge at the end away from the top blade edge. The two second blade edges and the two third blade edges are symmetrically arranged about the center line of the top blade edge.

[0009] The cutter blade for ball thread machining has the following characteristics. The cutter blade is a milling cutter blade. The milling cutter blade includes a fixed body and a plurality of blade portions. The fixed body is a flat block. A through fixing hole is formed in the center of the fixed body. The plurality of blade portions are arranged on the outer side wall of the fixed body and are distributed in a ring array with the hole axis of the fixing hole as the axis. The blade portions and the fixed body are of an integral structure. A first base surface is arranged on the side wall of the fixed body between adjacent two blade portions. The two ends of the fixed body are flat surfaces as second base surfaces. Each blade portion is provided with a blade edge on the side away from the fixed body. Each blade edge includes a top blade edge, two second blade edges and two third blade edges. The middle part of the top blade edge is located on the center line in the thickness direction of the fixed body. The two sides of the top blade edge are respectively connected with a second blade edge. Each second blade edge is connected with a third blade edge at the end away from the top blade edge. The two second blade edges and the two third blade edges are symmetrically arranged about the center line of the top blade edge.

[0010] The ball thread machining blade, wherein the first base surface of the fixed body is provided with a relief groove between the rake surface of the corresponding blade portion, one side of the relief groove is connected with the rake surface, the other end of the relief groove is arranged at an angle with the first base surface, and the angle range of the relief groove with the first base surface is 50-60°.

[0011] The ball thread machining tool holder for installing the ball thread machining blade, comprising a clamping end and a tool bar, the tool bar and the clamping end are arranged in a direction, one end of the tool bar is installed on one end of the clamping end, the end of the tool bar away from the clamping end is provided with a blade mounting position, the milling blade is installed in the blade mounting position and at least one blade portion protrudes out of the tool bar, the hole axis of the fixed hole of the milling blade is consistent with the arrangement direction of the tool bar and the clamping end, and the blade mounting position is a "V"-shaped groove, and the two side walls of the "V"-shaped groove form a first matching surface corresponding to the first base surface respectively, and the groove bottom surface of the "V"-shaped groove forms a second matching surface corresponding to the second base surface.

[0012] The ball thread machining tool holder, wherein the outer side wall of the end of the tool bar provided with the blade mounting position and located in front of the rake surface of the protruding blade portion is provided with a relief notch.

[0013] The ball thread machining tool holder, wherein the relief notch is installed with a chip guide block, one side of the chip guide block away from the clamping end is provided with a chip guide groove, the chip guide groove is spirally arranged along the arrangement direction of the tool bar, and the starting point of the chip guide groove extends to the rake surface.

[0014] The ball thread machining tool holder, wherein it further comprises a lateral adjustment assembly, the lateral adjustment assembly is installed on the clamping end, the tool bar is installed on the lateral adjustment assembly, and the lateral adjustment assembly makes telescopic movement on the clamping end along the plane where the rake surface of the blade portion is located.

[0015] The lateral adjusting assembly comprises an adjusting piece, a limiting piece, an adjusting push block, an adjusting spring and an end cover, the clamping end is arranged in a cylindrical shape, the end cover is arranged at the barrel opening of the end of the clamping end away from the tool bar, two adjusting grooves are symmetrically arranged on the inner wall of the barrel of the clamping end and are arranged along the axial direction of the clamping end, the groove bottom wall of each adjusting groove is arranged in an inclined surface, the inclined directions of the groove bottom walls of the two adjusting grooves are opposite, each adjusting groove is slidably provided with an adjusting push block, one side wall of the adjusting push block is an inclined surface and is in abutment with the groove bottom wall of the corresponding adjusting groove, the other side of the adjusting push block is an adjusting plane arranged along the axial direction of the clamping end, one end of the tool bar is inserted into the clamping end from the end of the clamping end away from the end cover and extends to between the two adjusting push blocks, and the two sides of the one end of the tool bar extending to between the two adjusting push blocks are in abutment with the adjusting planes of the two adjusting push blocks, meanwhile, the limiting piece is arranged on the side wall of the end of the clamping end away from the end cover, the limiting piece is arranged along the radial direction of the clamping end and is symmetrically arranged on the two sides of the clamping end, one end of the limiting piece extends into the clamping end and abuts against the two sides of the tool bar in cooperation with the two adjusting planes, and two adjusting pieces arranged along the adjusting grooves are mounted on the end cover, the two adjusting pieces abut against the two adjusting push blocks, meanwhile, the sides of the two adjusting push blocks away from the two adjusting pieces abut against one adjusting spring respectively, and one end of the adjusting spring away from the adjusting push block abuts against the inner wall of the barrel of the clamping end.

[0016] The positive effects of the above technical solution are:

[0017] The ball thread machining tool piece and tool holder have the following advantages: the milling tool piece is arranged on the tool holder, the milling tool piece comprises a fixed body and a plurality of blade portions arranged outside the fixed body, each blade portion has a blade edge, each blade edge comprises a top blade edge, two second blade edges and two third blade edges, the middle part of the top blade edge is located on the center line in the thickness direction of the fixed body, the two second blade edges are connected to the two sides of the top blade edge respectively, each second blade edge is further connected to a third blade edge, and the two second blade edges and the third blade edges are symmetrically arranged about the center line in the thickness direction of the fixed body, so that the simultaneous milling of a plurality of contour edges on the cross section of the ball thread is realized, the machining precision is ensured, the cooperation of other machining processes is not required, the machining efficiency is improved, in the case of damage to one blade portion, the milling tool piece can be directly rotated to continue the machining through other blade portions, the tool is not required to be replaced as a whole, the machining cost is reduced, and the mass production and manufacturing of the ball nut are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structure diagram of one embodiment of the ball thread machining tool piece according to the present application from one perspective;

[0019] Figure 2 FIG. 2 is a structure diagram of another embodiment of the ball thread machining tool piece according to the present application from another perspective.

[0020] Figure 3 Figure 1 is a schematic view of a ball thread machining blade and a blade holder of the present application after installation;

[0021] Figure 4 Figure 2 is a sectional view of the ball thread machining blade and the blade holder of the present application after installation;

[0022] Figure 5 Figure 3 is a schematic view of a tool bar of the blade holder of the present application;

[0023] Figure 6 Figure 4 is a sectional view of a clamping end of the blade holder of the present application;

[0024] Figure 7 Figure 5 is a structural view of the clamping end of the blade holder of the present application.

[0025] In the drawings: 1, milling blade; 11, fixed body; 12, blade part; 13, rake angle; 14, relief angle; 15, avoiding groove; 111, fixed hole; 112, first base surface; 113, second base surface; 121, blade edge; 1211, top blade edge; 1212, second blade edge; 1213, third blade edge; 2, blade holder; 21, clamping end; 22, tool bar; 211, adjusting groove; 212, strip-shaped hole; 221, blade mounting position; 222, avoiding notch; 223, chip guide block; 224, limiting stop; 2211, first matching surface; 2212, second matching surface; 2231, chip guide groove; 3, lateral adjusting assembly; 31, adjusting part; 32, limiting part; 33, adjusting push block; 34, adjusting spring; 35, end cover; 331, adjusting plane. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the following embodiments are combined with the accompanying drawings to Figure 1 to Figure 7 The technical solutions provided by the present application are specifically described below, but the following content is not a limitation of the present application.

[0027] Figure 1 Figure 1 is a schematic view of a ball thread machining blade and a blade holder of the present application after installation; Figure 2 Figure 2 is a sectional view of the ball thread machining blade and the blade holder of the present application after installation; Figure 1 and Figure 2 As shown in the drawings, the ball thread machining blade provided by the present embodiment is a milling blade 1, which is used for milling processing of the ball thread of a ball nut, ensures the processing precision, and provides conditions for improving the processing efficiency and reducing the overall replacement frequency of the tool.

[0028] Specifically, the milling insert 1 further comprises a fixed body 11 and a plurality of blade portions 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 ensures that the milling process can be stably completed. At this time, a through fixing hole 111 is also provided in the center of the fixed body 11, so that the milling insert 1 can be installed on the tool holder 2 by passing through the fixing hole 111 with a bolt afterwards, which is convenient for subsequent rotation of the milling insert 1 to change different blade portions 12 for milling. In addition, a plurality of blade portions 12 are arranged on the outer side wall of the fixed body 11, and the plurality of blade portions 12 are arranged in a ring array with the hole axis of the fixing hole 111 as the axis, so that the structure of the milling insert 1 is more uniform, and it is ensured that each blade portion 12 can maintain consistent machining effect during machining. Moreover, the blade portion 12 and the fixed body 11 are of an integrated structure, which ensures the structural strength of the milling insert 1, the structure is more stable, and the machining precision is higher. In addition, the side wall of the fixed body 11 and between the two adjacent blade portions 12 are provided with a first base surface 112, and the two ends of the fixed body 11 are planes as second base surfaces 113, so that when the milling insert 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, which ensures that the milling insert 1 can be stably installed on the tool holder 2, meets the milling machining requirement, and guarantees the machining precision. In addition, each blade portion 12 is provided with a blade edge 121 on the side away from the fixed body 11, and each blade edge 121 comprises a top blade edge 1211, two second blade edges 1212 and two third blade edges 1213, at this time, the middle part of the top blade edge 1211 is located on the center line of the thickness direction of the fixed body 11, the two sides of the top blade edge 1211 are respectively connected with a second blade edge 1212, and each second blade edge 1212 is connected with a third blade edge 1213 at the end away from the top blade edge 1211, and the two second blade edges 1212 and the two third blade edges 1213 are symmetrically arranged about the center line of the top blade edge 1211, so that each blade edge 121 has at least five edges, which exactly meets the profile of the cross-sectional shape of the ball screw thread, so that when the inner wall of the ball nut is milled by the milling insert 1, the plurality of profile edges on the ball screw thread cross section can be milled at the same time, which guarantees the machining precision and improves the machining efficiency without the cooperation of other machining processes. In addition, since the milling insert 1 has a plurality of blade portions 12 which can be replaced and used, compared with the traditional welded tool, in the case of damage of a blade portion 12, the milling insert 1 can be directly rotated to continue processing by other blade portions 12, without the need for overall replacement of the tool, which reduces the processing cost and is beneficial to the mass production of ball nuts.

[0029] More specifically, the three blade parts 12 are arranged in an equilateral triangle shape with the fixed body 11, so that the overall stability of the milling blade 1 is higher, and in addition, after the milling blade 1 is installed on the tool holder 2, one of the blade parts 12 extends out for milling processing, and the other two blade parts 12 are limited by the tool holder 2, so that the milling blade 1 can be more stably installed on the tool holder 2, meeting the milling processing requirements and ensuring the processing precision, so that additional processing technology is not required to cooperate with processing, and the processing efficiency is improved. In addition, the three blade parts 12 are respectively located at the three vertices, so that the position and state of each blade part 12 on the fixed body 11 are the same, thereby providing conditions for subsequent replacement of damaged blade parts 12 by other blade parts 12 to complete milling processing, and the structure design is more reasonable.

[0030] More specifically, the angle between the rake face of the blade part 12 of the milling blade 1 and the first base surface 112 is set as a rake angle 13, at this time, the range of the rake angle 13 is set as 18-24°, and preferably, the rake angle 13 is 22°, which ensures that a better feed angle can be provided during milling processing, the cutting efficiency is higher, and at the same time, the influence on the ball nut itself is reduced, the damage of the blade edge 121 is avoided, and the service life of the milling blade 1 is prolonged under the condition of ensuring the milling processing precision.

[0031] More specifically, the relief face of the blade part 12 of the milling blade 1 is inclined toward the center line of the thickness direction, and the angle between each relief face and the second base surface 113 is set as a relief angle 14, at this time, the range of the relief angle 14 is set as 3-5°, and preferably, the relief angle 14 is 4°, which can ensure the structural strength of the blade part 12, avoid the problem of fracture of the blade part 12 during cutting, and avoid the other parts of the blade part 12 except the blade edge 121 from contacting the ball nut, so as to ensure that the processing of the ball thread only affects the blade edge 121 of the blade part 12, thereby ensuring the processing quality, and the structure design is more reasonable.

[0032] More specifically, an avoiding groove 15 is further arranged on the first base surface 112 of the fixed body 11 and between the rake face of the corresponding blade part 12, at this time, one side of the avoiding groove 15 is connected with the rake face, the other end of the avoiding groove 15 is arranged at an angle with the first base surface 112, and the angle between the avoiding groove 15 and the first base surface 112 is set as 50-60°, and preferably, the angle between the avoiding groove 15 and the first base surface 112 is 55°, which can facilitate the machining of the rake face of the blade part 12 itself, and at the same time, can reserve space for the cutting scraps generated during subsequent milling processing, avoid the cutting interference problem caused by the accumulation of cutting scraps, ensure the processing quality, and in addition, can avoid the problem that the first base surface 112 is easily collided with the ball nut to be processed due to excessive extension during the machining process, and the structure design is more reasonable.

[0033] Figure 3Figure 2 is a schematic view of the installed ball thread machining blade and tool holder according to the present application; Figure 4 Figure 3 is a cross-sectional view of the installed ball thread machining blade and tool holder according to the present application. Figure 3 Figure 4 As shown in the figures, the ball thread machining tool holder 2 according to the present application is used to install the ball thread machining blade, and at this time, the ball thread machining tool holder 2 further comprises a clamping end 21 and a tool bar 22. The milling blade 1 is installed through the tool bar 22, and the tool bar 22 is installed on the driving shaft through the clamping end 21, thereby meeting the milling requirements. In addition, the tool bar 22 and the clamping end 21 are arranged in a direction, and one end of the tool bar 22 is installed on one end of the clamping end 21. Furthermore, a blade installation position 221 is arranged on the end of the tool bar 22 away from the clamping end 21, the milling blade 1 is installed in the blade installation position 221, and at least one blade part 12 of the milling blade 1 extends out of the tool bar 22. When milling, the power of the driving shaft is transmitted to the tool bar 22 through the clamping end 21, the milling blade 1 is driven to rotate through the tool bar 22, and the blade part 12 of the milling blade 1 extending out of the tool bar 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 holder 2, the blade part 12 thereof is arranged in the tangential direction of the tool bar 22 or a direction close to the tangential direction, thereby enabling the tool holder 2 to drive the milling blade 1 to rotate when milling the ball nut. Furthermore, 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. After the milling blade 1 is installed in the blade installation position 221, the milling blade 1 can be positioned and limited from different directions through at least three surfaces, thereby ensuring the accuracy of the installation position of the milling blade 1 and the stability after installation, thereby ensuring the processing precision and improving the processing efficiency.

[0034] More specifically, an avoidance notch 222 is further provided on the outer side wall of the end of the tool bar 22 where the rake face of the blade part 12 is located, in front of the rake face. The avoidance notch 222 provides the largest cutting space in front of the blade edge 121 of the blade part 12, which can prevent the tool from colliding and quickly remove the cutting waste, thereby making the processing more convenient.

[0035] ​More specifically, a chip guide block 223 can be installed inside the clearance notch 222. In this case, a first connecting hole is provided on the clearance notch 222, and a second connecting hole is provided on the chip guide block 223. The first connecting hole and the second connecting hole can be connected by screws passing through them, which realizes the disassembly and installation of the chip guide block 223 on the tool holder 22, meets different processing requirements, has better adaptability, and also realizes the hidden installation of the chip guide block 223 on the tool holder 22, preventing the chip guide block 223 from interfering with 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. The chip guide groove 2231 is arranged spirally along the arrangement direction of the tool holder 22, and the starting point of the chip guide groove 2231 extends to the rake face. When the cutting amount of milling is large, the thickness of the chips generated by cutting is large and the structural strength is high. They are very easy to get stuck between the cutting edge 12 and the workpiece, which will affect the machining accuracy. At this time, the chip guide groove 2231 can guide the chips to the side away from the cutting edge 12 in the first time, thereby pushing the chips and ensuring that the chips can be discharged in the first time. 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 holder 22, so that the high-pressure air on the outside can be blown into the clearance notch 222 to blow away the chips. That is, different chip removal methods can be selected for different cutting amounts, resulting in higher structural flexibility and better adaptability.

[0036] Figure 5 This is a schematic diagram of a tool holder for ball thread machining according to the present invention; Figure 6 This is a cross-sectional view of the clamping end of a tool holder for ball thread machining according to the present invention; Figure 7 This is a structural diagram of the clamping end of a tool holder for ball thread machining according to 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 bar 22 is installed on the lateral adjustment component 3. Furthermore, the lateral adjustment component 3 can extend and retract along the plane where the rake face of the cutting edge 12 is located on the clamping end 21. That is, by adjusting the lateral adjustment component 3, the cutting edge 12 of the milling cutter 1 can be extended or retracted without changing the position of the clamping end 21, thereby meeting the processing requirements of ball nuts with different inner diameters. There is no need to develop a separate tool holder 2, making the structure more flexible and the utilization rate higher.

[0037] More specifically, the lateral adjustment assembly 3 further comprises an adjustment member 31, a limiting member 32, an adjustment push block 33, an adjustment spring 34 and an end cover 35. At this time, the clamping end 21 is arranged in a cylindrical manner, so that the clamping end 21 has a cylindrical inner cavity penetrating through both ends thereof, thereby providing a space for the installation of the lateral adjustment assembly 3, while also ensuring the flatness of the outer side surface of the clamping end 21 to meet the traditional clamping requirements. In addition, the end cover 35 is arranged at the cylindrical opening of the end of the clamping end 21 away from the cutter bar 22, thereby closing one end of the cylindrical inner cavity of the clamping end 21 to provide 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 clamping end 21 and are arranged along the axial direction of the clamping end 21. In addition, the groove bottom wall of each adjustment groove 211 is arranged in an inclined manner, and the groove 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 in the axial direction of the clamping end 21, thereby providing conditions for the subsequent displacement of the adjustment push block 33 in the radial direction of the clamping end 21. In addition, the inclination directions of the groove bottom walls of the two adjustment grooves 211 are opposite, thereby enabling the two adjustment push blocks 33 to move in the same direction in the radial direction of the clamping seat when the two adjustment push blocks 33 move in opposite directions in the corresponding adjustment grooves 211. At this time, one adjustment push block 33 is slidably arranged in each adjustment groove 211. One side wall of the adjustment push block 33 is inclined and abuts against the groove bottom wall of the corresponding adjustment groove 211, and the other side surface of the adjustment push block 33 is an adjustment plane 331 arranged along the axial direction of the clamping end 21. When the adjustment push block 33 slides in the corresponding adjustment groove 211 along the axial direction of the clamping end 21, the adjustment plane 331 of the adjustment push block 33 moves in the radial direction of the clamping end 21 under the interaction of the adjustment groove 211 and the inclined surface of the adjustment push block 33, so that the distance between the adjustment plane 331 and the axis of the clamping end 21 changes, thereby providing conditions for the subsequent movement of the cutter bar 22 in the radial direction of the clamping end 21, thereby realizing the extension or retraction of the blade 12 of the milling blade 1. In addition, one end of the cutter bar 22 is inserted into the clamping end 21 away from the end provided with the end cover 35 and extends between the two adjustment push blocks 33, so that the installation position of the cutter bar 22 on the clamping end 21 changes with the movement of the adjustment push block 33, thereby meeting the adjustment requirements of the extension or retraction of the blade 12 of the milling blade 1.And, the two sides of the end of the knife bar 22 extending to the two sides between the two adjusting push blocks 33 are respectively matched with the adjusting planes 331 of the two adjusting push blocks 33, so that each adjusting push block 33 can stably push the knife bar 22 to move along the radial direction of the clamping end 21. Preferably, the two sides of the end of the knife bar 22 extending to the two sides between the two adjusting push blocks 33 are also arranged in a plane to better match the adjusting planes 331, and at the same time, the problem that the knife bar 22 circumferentially rotates to cause the adjusting direction of the knife bar 22 to be inconsistent with the extending or retracting direction of the blade part 12 of the milling blade 1 is prevented, so as to ensure that the final purpose of the adjustment is to adjust the extending distance of the blade part 12, thereby adapting to the machining of the ball nut with different inner diameters. In addition, the limiting piece 32 is arranged on the side wall of the end of the clamping end 21 away from the end cover 35, and the limiting piece 32 is arranged along the radial direction of the clamping end 21 and symmetrically arranged on the two sides of the clamping end 21, and one end of the limiting piece 32 extends into the clamping end 21 and abuts on the two sides of the knife bar 22 matched with the two adjusting planes 331, so that one end of the section of the knife bar 22 extending into the clamping end 21 can be limited by the adjusting push block 33, and the other end can be limited by the limiting piece 32, so as to ensure that the knife bar 22 can meet the adjustment requirement after being installed on the clamping end 21, and the installation stability and reliability are ensured, and the machining precision is ensured. And, the two adjusting pieces 31 are arranged on the end cover 35 along the adjusting groove 211, and the two adjusting pieces 31 abut on the two adjusting push blocks 33, respectively, so that the adjusting direction of the two adjusting pieces 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, thereby providing conditions for the subsequent pushing of the adjusting push block 33 to slide in the adjusting groove 211. At the same time, the side of the two adjusting push blocks 33 away from the two adjusting pieces 31 respectively abuts on one adjusting spring 34, and one end of the adjusting spring 34 away from the adjusting push block 33 abuts on the inner wall of the clamping end 21, so that the adjusting spring 34 and the adjusting piece 31 are respectively located on the two sides of the adjusting push block 33, so that the adjusting push block 33 pushed by the adjusting piece 31 can be reversely reset under the action of the adjusting spring 34 in the case that the adjusting piece 31 is reversely loosened, thereby preventing the problem that the adjusting push block 33 is stuck and cannot be adjusted.And, each adjusting push block 33 corresponds to an adjusting member 31 and an adjusting spring 34, when adjusting, first loosen the adjusting member 31 on one side of the blade part 12 extending or retracting side, reverse the adjusting push block 33, so that the corresponding adjusting push block 33 moves to the side of the end cover 35 under the action of the corresponding adjusting spring 34, so that the adjusting push block 33 moves away from the axis of the clamping end 21, and then loosen the same side of the limiting member 32, reserve space for the radial movement of the tool bar 22 along the clamping end 21, then tighten the other adjusting member 31 and push the corresponding adjusting push block 33 to continue moving along the radial direction of 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 at the same time, so that the adjusting push block 33 and the limiting member 32 can push both ends of the tool bar 22 to the side of the axis of the clamping end 21, so that the distance between the tool bar 22 and the axis of the clamping end 21 changes, thereby realizing the extension or retraction of the blade part 12 without changing the position of the clamping end 21, meeting the adjustment requirements.

[0038] As a preferred embodiment, the tool bar 22 extends to one end inside the clamping end 21 and is provided with a limiting stop 224 between the limiting member 32 and the adjusting push block 33, and when the tool bar 22 is installed in place, one side of the limiting stop 224 abuts against the limiting member 32, thereby avoiding the tool bar 22 from being pulled out from the end of the clamping end 21 away from the end cover 35, and improving the structural stability.

[0039] As a further preferred embodiment, the barrel opening of the end of the clamping end 21 away from the installation end cover 35 is provided as a strip-shaped hole 212, and the length direction of the strip-shaped hole 212 is perpendicular to the adjusting plane 331, so that when the tool bar 22 is pushed to move in the direction perpendicular to the adjusting plane 331 by the adjusting push block 33 acting on the adjusting plane 331, the movement of the tool bar 22 can be guided through the strip-shaped hole 212, ensuring that the tool bar 22 can move stably, and also ensuring that the movement direction of the tool bar 22 is the plane where the rake face of the blade part 12 is located, meeting the requirement of adjusting the extension distance of the blade part 12, and preventing the problem of machining parts or milling blades 1 being scrapped due to errors in the adjusting direction or displacement of the tool bar 22 in other directions during use, and the structure design is more reasonable.

[0040] As a further preferred embodiment, the end cover 35 can be installed in the barrel opening of the clamping end 21 in a threaded connection manner, and the adjusting member 31 and the end cover 35 can also be in a threaded connection, that is, the adjusting push block 33 can be pushed or loosened by screwing, in addition, the limiting member 32 can also be screwed on the clamping end 21, and the tool bar 22 can also be tightened or loosened by screwing the limiting member 32, thereby meeting the requirement of convenient adjustment.

[0041] The ball thread machining blade and the tool holder provided by the embodiment comprises a milling blade 1 and a tool holder 2; the milling blade 1 is installed in a blade installation position 221 of the tool holder 2, the tool holder 2 drives the milling blade 1 to rotate, and the milling of the ball thread is realized; and the milling blade 1 comprises a plurality of blade portions 12 which are uniformly distributed on a fixed body 11, each blade portion 12 comprises a top blade edge 1211 which is arranged on the center line in the thickness direction of the fixed body 11, and the two sides of the top blade edge 1211 are connected with second blade edges 1212, each second blade edge 1212 is further connected with a third blade edge 1213, and the two second blade edges 1212 and the two third blade edges 1213 are symmetrically arranged about the center line in the thickness direction of the fixed body 11, the simultaneous milling of the plurality of profile edges on the cross section of the ball thread is realized, the machining precision is ensured, the cooperation of other machining procedures is reduced, the machining efficiency is improved, welding cutter machining is not needed, in the case that one blade portion 12 is damaged, another blade portion 12 can be used for continuous machining by rotating the milling blade 1, the tool is not needed to be replaced as a whole, the machining cost is lower, and the mass production and manufacturing of the ball nut are facilitated.

[0042] The above is only the preferred embodiment of the present application, and does not limit the implementation and protection scope of the present application. It should be realized by those skilled in the art that any equivalent replacement and obvious change based on the content of the present application should be included in the protection scope of the present application.

Claims

1. A ball thread machining insert, characterized by, The milling blade comprises a fixed body and a plurality of blade portions, the fixed body is a flat block, a through fixing hole is formed in the center of the fixed body, a plurality of blade portions are arranged on the outer side wall of the fixed body, and the blade portions are arranged in a ring array around the hole axis of the fixing hole, the blade portions and the fixed body are an integral structure, the side wall of the fixed body and between two adjacent blade portions are provided with a first base surface, both ends of the fixed body are flat as a second base surface, the side of each blade portion away from the fixed body is provided with a blade edge, each blade edge comprises a top blade edge, two second blade edges and two third blade edges, the middle part of the top blade edge is located on the center line of the thickness direction of the fixed body, the two sides of the top blade edge are respectively connected with a second blade edge, the end of each second blade edge away from the top blade edge is connected with a third blade edge, and the two second blade edges and the two third blade edges are symmetrically arranged about the center line of the top blade edge; The included angle between the rake face of the blade portion of the milling blade and the first base surface is the rake angle, and the range of the rake angle is 18-24°; The first base surface of the fixed body and the rake face of the corresponding blade portion are provided with a relief groove, one side of the relief groove is connected with the rake face, the other end of the relief groove is arranged at an angle with the first base surface, and the angle between the relief groove and the first base surface is 50-60°. The blade portion is provided with three, the overall structure of the blade portion and the fixed body is arranged in an equilateral triangle, and the three blade portions are respectively located at the three vertices.

2. The ball thread machining insert according to claim 1, characterized in that The flank face of the blade portion of the milling blade is inclined to the side of the center line of the thickness direction, and the included angle between each flank face and the second base surface is the relief angle, and the range of the relief angle is 3-5°.

3. The ball thread machining insert according to claim 1, characterized in that The milling blade comprises a clamping end and a tool bar, the tool bar and the clamping end are arranged in a direction, one end of the tool bar is installed on one end of the clamping end, the tool bar provided with a blade mounting position at the end away from the clamping end, the milling blade is installed in the blade mounting position and at least one blade portion protrudes out of the tool bar, the hole axis of the fixing hole of the milling blade is consistent with the arrangement direction of the tool bar and the clamping end, and the blade mounting position is a "V" type groove, and the two side walls of the "V" type groove form a first matching surface corresponding to the first base surface, and the groove bottom surface of the "V" type groove forms a second matching surface corresponding to the second base surface.

4. A ball thread machining tool holder for mounting the ball thread machining insert according to any one of claims 1 to 3, characterized in that The outer side wall of the end of the tool bar provided with the blade mounting position is provided with a relief notch in front of the rake face of the protruding blade portion.

5. The ball thread machining tool holder according to claim 4, characterized in that A chip guide block is installed in the relief notch, the chip guide groove is arranged in a spiral along the arrangement direction of the tool bar, and the starting point of the chip guide groove extends to the rake face.

6. The ball thread machining tool holder according to claim 5, characterized in that ​ 7. The ball thread machining tool holder according to claim 4, characterized in that Also included is a lateral adjustment assembly mounted on the clamping end, the tool bar is mounted on the lateral adjustment assembly, and the lateral adjustment assembly is in telescopic movement on the clamping end along the plane where the rake face of the blade is located.

8. The ball thread machining tool holder according to claim 7, characterized in that The lateral adjustment assembly includes an adjusting piece, a limiting piece, an adjusting push block, an adjusting spring and an end cover, the clamping end is arranged in a cylindrical shape, the end cover is arranged at the barrel opening of the end of the clamping end away from the tool bar, two adjusting grooves are symmetrically arranged on the inner wall of the barrel of the clamping end and are arranged along the axial direction of the clamping end, the groove bottom wall of each adjusting groove is arranged in an inclined surface, and the inclined directions of the groove bottom walls of the two adjusting grooves are opposite, one adjusting push block is slidably arranged in each adjusting groove, one side wall of the adjusting push block is an inclined surface and is in close contact with the groove bottom wall of the corresponding adjusting groove, the other side of the adjusting push block is an adjusting plane arranged along the axial direction of the clamping end, one end of the tool bar is inserted into the clamping end from the end of the clamping end away from the end cover and extends between the two adjusting push blocks, the two sides of the end of the tool bar extending between the two adjusting push blocks are in close contact with the adjusting planes of the two adjusting push blocks, respectively, at the same time, the limiting piece is arranged on the side wall of the end of the clamping end away from the end cover, the limiting 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 limiting piece extends into the clamping end and abuts against the two sides of the tool bar cooperating with the two adjusting planes, respectively, and two adjusting pieces arranged along the adjusting grooves are mounted on the end cover, the two adjusting pieces abut against the two adjusting push blocks, respectively, at the same time, one adjusting spring abuts against one side of each adjusting push block away from the two adjusting pieces, and one end of the adjusting spring away from the adjusting push block abuts against the inner wall of the barrel of the clamping end.

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