Countershaft mechanism of machine tool

Abstract

The utility model discloses an auxiliary shaft mechanism of a machine tool, and relates to the technical field of machine tool equipment, the auxiliary shaft mechanism comprises a machine tool body, a workbench and an auxiliary shaft box, the auxiliary shaft box is provided with an auxiliary shaft capable of rotating, and the auxiliary shaft box is in sliding connection with the machine tool body in the direction perpendicular to the auxiliary shaft and in the axial direction of the auxiliary shaft through a first guide assembly and a second guide assembly respectively, the first guide assembly and the second guide assembly each comprise a guide rail arranged in a stepped mode and a corresponding sliding block, the supporting area of the auxiliary shaft box in the axial direction and the radial direction of the auxiliary shaft is increased, high-precision motion control and stable operation performance are ensured, and the machining efficiency and the machining quality of a machine tool are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tool equipment, in particular to a machine tool auxiliary shaft mechanism. BACKGROUND

[0002] The auxiliary shaft mechanism of the machine tool is widely used in various precision machining equipment, especially in occasions requiring high precision machining. With the increasing requirements of modern manufacturing industry on machining precision and efficiency, the design and manufacturing of machine tools are also constantly improving. In traditional machine tool design, the auxiliary shaft mechanism is mainly used to assist the main shaft to complete multi-process machining to improve production efficiency and machining quality. However, the existing auxiliary shaft mechanism still has some deficiencies in actual application, especially in terms of carrying capacity and positioning accuracy. In order to improve the performance of the auxiliary shaft mechanism, various ways are usually adopted in the prior art to enhance the stability and carrying capacity of the auxiliary shaft mechanism. Common methods include but are not limited to: (1) using high-precision guide rails and sliding blocks combination to ensure that the auxiliary shaft maintains good straightness and stability during movement; (2) optimizing the structural design of the auxiliary shaft box, increasing the number and distribution of support points to disperse the load; (3) using high-strength materials and advanced manufacturing processes to improve the rigidity and durability of the parts; (4) by increasing the lubrication system, reducing friction and wear, prolonging the service life. These methods improve the performance of the auxiliary shaft mechanism to some extent, but there are still some limitations in actual application.

[0003] Although the above measures improve the performance of the auxiliary shaft mechanism to some extent, there is a common problem in the prior art that the auxiliary shaft mechanism has insufficient axial carrying capacity when machining workpieces. Specifically, the auxiliary shaft is prone to deformation when machining heavy load workpieces, which leads to a decrease in positioning accuracy, thereby affecting the machining quality and production efficiency. Therefore, how to improve the carrying capacity and positioning accuracy of the auxiliary shaft mechanism when machining workpieces has become a technical problem to be solved. CONTENT OF THE INVENTION

[0004] In order to help improve the carrying capacity of the auxiliary shaft mechanism when machining workpieces, the present application provides an auxiliary shaft mechanism of a machine tool, which adopts the following technical scheme:

[0005] An auxiliary shaft mechanism of a machine tool, comprising a bed, a worktable and an auxiliary shaft box, the auxiliary shaft box is provided with a rotatable auxiliary shaft, the auxiliary shaft box is installed on the worktable, the worktable is slidably connected with the bed along a direction perpendicular to the auxiliary shaft through a first guide assembly, the first guide assembly comprises a first guide rail and a second guide rail installed horizontally and spaced apart on the bed, and the installation heights of the first guide rail and the second guide rail are arranged in steps.

[0006] By adopting the technical scheme, the workbench is slidably connected with the lathe bed along a direction perpendicular to the sub-shaft through the first guide assembly, the first guide assembly is horizontally and spacedly arranged on the lathe bed through the first guide rail and the second guide rail, and the installation heights are arranged in steps, so that the supporting area of the lathe bed to the workbench along the axial direction of the sub-shaft is increased, the positioning accuracy of the sub-shaft during machining of the workpiece is improved, and the machining accuracy of the workpiece is improved.

[0007] Optionally, the lathe bed is provided with a first mounting surface on which the first guide rail is mounted and a second mounting surface on which the second guide rail is mounted, the first mounting surface is located at one end close to the sub-shaft chuck, and the second mounting surface is located at the other end of the sub-shaft, and the height of the second mounting surface is higher than that of the first mounting surface.

[0008] By adopting the technical scheme, the first mounting surface is located at one end close to the sub-shaft chuck, the second mounting surface is located at the other end of the sub-shaft, and the second mounting surface is higher than the first mounting surface, so that the supporting area of the lathe bed to the workbench along the axial direction of the sub-shaft is increased, the load bearing capacity of the workbench along the axial direction of the sub-shaft is improved, the deformation of the workbench relative to the lathe bed is reduced, and the machining accuracy of the workpiece is improved.

[0009] Optionally, the first mounting surface is provided with a first positioning table for transversely positioning the first guide rail, and the second mounting surface is provided with a second positioning table for transversely positioning the second guide rail, the first positioning table is located at one side of the first mounting surface close to the second mounting surface, and the second positioning table is located at one side of the second mounting surface close to the first mounting surface.

[0010] By adopting the technical scheme, the first positioning table is transversely positioned to the first guide rail, and the second positioning table is transversely positioned to the second guide rail, and when the workbench bears the load along the axial direction of the sub-shaft, the first positioning table supports the first guide rail along the axial direction of the sub-shaft, and the second positioning table supports the second guide rail along the axial direction of the sub-shaft, so that the axial force of the workbench along the sub-shaft is further improved.

[0011] Optionally, the first guide assembly further comprises a plurality of first sliding blocks slidably arranged on the first guide rail and a plurality of second sliding blocks slidably arranged on the second guide rail, one end of the first sliding block away from the first guide rail is fixedly connected with the workbench, and one end of the second sliding block away from the second guide rail is fixedly connected with the workbench.

[0012] By adopting the technical scheme, the first guide rail is provided with a plurality of first sliding blocks slidingly arranged thereon, the second guide rail is provided with a plurality of second sliding blocks slidingly arranged thereon, and the first sliding blocks and the second sliding blocks are fixedly connected with the workbench, thereby improving the load capacity of the sliding support of the workbench and the reliability of the connection, and helping to reduce the relative displacement of the workbench and the bed body in the height direction due to the load.

[0013] Optionally, the bottom of the workbench is provided with a first mounting groove for mounting the first sliding blocks and a second mounting groove for mounting the second sliding blocks, one end of the first sliding block away from the first guide rail is fixedly mounted at the bottom of the first mounting groove, one side wall of the first sliding block abuts against the inner wall of the first mounting groove, and one side wall of the second sliding block abuts against the inner wall of the second mounting groove.

[0014] By adopting the technical scheme, the first sliding block is mounted in the first mounting groove, and the second sliding block is mounted in the second mounting groove, thereby improving the firmness of the mounting and connection of the first sliding block and the second sliding block on the workbench, one side wall of the first sliding block abuts against the inner wall of the first mounting groove, one side wall of the second sliding block abuts against the inner wall of the second mounting groove, thereby improving the convenience of the mounting of the first sliding block and the second sliding block in the first mounting groove and the second mounting groove, and improving the reliability of the force transmission between the first sliding block, the second sliding block and the workbench.

[0015] Optionally, the countershaft box is slidingly mounted on the workbench along the axial direction of the countershaft through a second guide assembly, the second guide assembly comprises a third guide rail and a fourth guide rail which are spaced apart and mounted on the workbench, and the mounting height of the third guide rail and the fourth guide rail is arranged in steps.

[0016] By adopting the technical scheme, the second guide assembly is spaced apart in the horizontal direction and arranged in steps in the height direction through the third guide rail and the fourth guide rail, thereby increasing the support area of the countershaft box on the workbench in the radial direction of the countershaft, and helping to improve the load capacity of the mounting structure of the countershaft box.

[0017] Optionally, the workbench is provided with a third mounting surface for mounting the third guide rail and a fourth mounting surface for mounting the fourth guide rail, the third mounting surface is located on the side of the workbench close to the bed body where the workpiece to be machined is mounted, the fourth mounting surface is spaced apart from the third mounting surface, and the height of the fourth mounting surface is higher than that of the third mounting surface.

[0018] By adopting the technical scheme, the third mounting surface is located on the side of the workbench close to the bed body where the workpiece to be machined is mounted, and is spaced apart from the fourth mounting surface in the horizontal direction, and the height of the fourth mounting surface is higher than that of the third mounting surface, thereby helping to improve the support area of the countershaft box on the workbench, and thereby improving the load capacity of the countershaft box when machining the workpiece.

[0019] Optionally, the third installation surface is provided with a third positioning table for transversely positioning the third guide rail, and the fourth installation surface is provided with a fourth positioning table for transversely positioning the fourth guide rail, the third positioning table is located on the side of the third installation surface close to the fourth installation surface, and the fourth positioning table is located on the side of the fourth installation surface close to the third installation surface.

[0020] By adopting the above technical scheme, the third positioning table transversely positions the third guide rail, and the fourth positioning table transversely positions the fourth guide rail. Meanwhile, when the auxiliary shaft box is subjected to a load in the radial direction of the auxiliary shaft, the third positioning table supports the third guide rail in the transverse direction, and the fourth positioning table supports the fourth guide rail in the transverse direction, thereby further improving the load bearing capacity of the auxiliary shaft box in the radial direction of the auxiliary shaft.

[0021] Optionally, the second guide assembly further comprises a plurality of third sliding blocks slidingly arranged on the third guide rail and a plurality of fourth sliding blocks slidingly arranged on the fourth guide rail, and the end of each third sliding block away from the third guide rail is fixedly connected with the auxiliary shaft box, and the end of each fourth sliding block away from the fourth guide rail is fixedly connected with the auxiliary shaft box.

[0022] By adopting the above technical scheme, a plurality of third sliding blocks are slidingly arranged on the third guide rail, and a plurality of fourth sliding blocks are slidingly arranged on the fourth guide rail. The third sliding blocks and the fourth sliding blocks are respectively fixedly connected with the auxiliary shaft box, thereby improving the load bearing capacity and reliability of the sliding support of the auxiliary shaft box and helping to reduce the relative displacement in the height direction between the auxiliary shaft box and the workbench due to the load.

[0023] Optionally, the bottom of the auxiliary shaft box is provided with a third installation groove for mounting the plurality of third sliding blocks and a fourth installation groove for mounting the plurality of fourth sliding blocks, the end of each third sliding block away from the third guide rail is fixedly installed at the bottom of the third installation groove, one side wall of each third sliding block abuts against the inner wall of the third installation groove, the end of each fourth sliding block away from the fourth guide rail is fixedly installed at the bottom of the fourth installation groove, and one side wall of each fourth sliding block abuts against the inner wall of the fourth installation groove.

[0024] By adopting the above technical scheme, the third sliding blocks are installed in the third installation grooves, and the fourth sliding blocks are installed in the fourth installation grooves, thereby improving the firmness of the installation and connection of the third sliding blocks and the fourth sliding blocks on the auxiliary shaft box. One side wall of each third sliding block abuts against the inner wall of the third installation groove, and one side wall of each fourth sliding block abuts against the inner wall of the fourth installation groove, thereby improving the convenience of the installation of the third sliding blocks and the fourth sliding blocks in the third installation grooves and the fourth installation grooves, and improving the reliability of the force transmission between the third sliding blocks and the fourth sliding blocks and the auxiliary shaft box.

[0025] To sum up, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The worktable is connected with the lathe bed along the direction perpendicular to the sub-shaft through the first guide assembly, the first guide assembly is arranged at intervals through the first guide rail and the second guide rail, and the installation height is arranged in steps, so that the support area of the lathe bed to the worktable along the axial direction of the sub-shaft is increased, and the axial load capacity of the sub-shaft during machining of the workpiece is improved;

[0027] 2. The first installation surface is located at one end close to the sub-shaft chuck, and the second installation surface is located at the other end of the sub-shaft, and the second installation surface is higher than the first installation surface, so that the support area of the lathe bed to the worktable along the axial direction of the sub-shaft is increased, the load capacity of the worktable along the axial direction of the sub-shaft is improved, and the deformation of the worktable relative to the lathe bed is reduced, and the machining precision of the workpiece is improved;

[0028] 3. A plurality of first sliding blocks are arranged on the first guide rail in sliding mode, and a plurality of second sliding blocks are arranged on the second guide rail in sliding mode, the first sliding blocks and the second sliding blocks are fixedly connected with the worktable, the load capacity of the sliding support of the worktable is improved, and the reliability of the connection is improved, so that the relative displacement of the worktable and the lathe bed in the height direction due to the load is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic view of the sub-shaft mechanism of the machine tool disclosed in the present application.

[0030] Figure 2 It is a front view of the sub-shaft mechanism of the machine tool disclosed in the present application.

[0031] Figure 3 It is a side view of the sub-shaft mechanism of the machine tool disclosed in the present application.

[0032] Figure 4 It is Figure 3 It is a partial enlarged view of the I position.

[0033] BRIEF DESCRIPTION OF DRAWINGS:

[0034] 1, lathe bed; 11, first installation surface; 12, second installation surface; 13, first positioning table; 14, second positioning table; 2, worktable; 21, first installation groove; 22, second installation groove; 23, third installation surface; 24, fourth installation surface; 25, third positioning table; 26, fourth positioning table; 3, sub-shaft box; 31, sub-shaft; 32, third installation groove; 33, fourth installation groove; 4, first guide assembly; 41, first guide rail; 42, second guide rail; 43, first sliding block; 44, second sliding block; 5, second guide assembly; 51, third guide rail; 52, fourth guide rail; 53, third sliding block; 54, fourth sliding block. DETAILED DESCRIPTION

[0035] The following description is made in connection with Figures 1 to 4 The application is further described in detail.

[0036] The application discloses a machine tool auxiliary shaft mechanism.

[0037] The application discloses a machine tool auxiliary shaft mechanism. Figure 1 , comprising a bed 1, a worktable 2 and an auxiliary shaft box 3, the auxiliary shaft box 3 is provided with a rotatable auxiliary shaft 31, the auxiliary shaft box 3 is installed on the worktable 2, the worktable 2 is slidably connected with the bed 1 along the direction perpendicular to the auxiliary shaft 31 through a first guide assembly 4, the first guide assembly 4 comprises a first guide rail 41 and a second guide rail 42 which are installed on the bed 1 in a horizontal interval, the first guide rail 41 and the second guide rail 42 are both linear guide rails in the embodiment of the application, a plurality of sliding blocks are arranged on each linear guide rail, the sliding blocks are slidably matched with the linear guide rail, and the installation heights of the first guide rail 41 and the second guide rail 42 are arranged in a stepped mode; the worktable 2 is slidably connected with the bed 1 along the direction perpendicular to the auxiliary shaft 31 through the first guide assembly 4, the first guide assembly 4 is installed on the bed 1 through the first guide rail 41 and the second guide rail 42 in an interval and in a stepped mode, so that the support area of the bed 1 to the worktable 2 along the axial direction of the auxiliary shaft 31 is increased, the worktable 2 is helped to bear a larger load along the axial direction of the auxiliary shaft 31 when machining a workpiece, the positioning accuracy of the auxiliary shaft 31 when machining the workpiece is improved, and thus the machining accuracy of the workpiece is improved.

[0038] Referring to Figure 1 , the bed 1 is provided with a first installation surface 11 for installing the first guide rail 41 and a second installation surface 12 for installing the second guide rail 42, the first installation surface 11 is located at one end close to a chuck of the auxiliary shaft 31, the second installation surface 12 is located at the other end of the auxiliary shaft 31, and the height of the second installation surface 12 is higher than that of the first installation surface 11; the first installation surface 11 is located at one end close to the chuck of the auxiliary shaft 31, the second installation surface 12 is located at the other end of the auxiliary shaft 31, and the second installation surface 12 is higher than the first installation surface 11, so that the support area of the bed 1 to the worktable 2 along the axial direction of the auxiliary shaft 31 is increased, the worktable 2 is helped to bear a load along the axial direction of the auxiliary shaft 31, the deformation of the worktable 2 relative to the bed 1 is reduced, and the machining accuracy of the workpiece is improved.

[0039] Referring to Figure 1, the first installation surface 11 is provided with a first positioning table 13 for transversely positioning the first guide rail 41, the second installation surface 12 is provided with a second positioning table 14 for transversely positioning the second guide rail 42, the first positioning table 13 is located on the side of the first installation surface 11 close to the second installation surface 12, and the second positioning table 14 is located on the side of the second installation surface 12 close to the first installation surface 11; the first positioning table 13 positions the first guide rail 41 in the transverse direction, the second positioning table 14 positions the second guide rail 42 in the transverse direction, and at the same time, when the workbench 2 is subjected to an axial load of the sub-shaft 31, the first positioning table 13 supports the first guide rail 41 in the axial direction of the sub-shaft 31, and the second positioning table 14 supports the second guide rail 42 in the axial direction of the sub-shaft 31, thereby further improving the axial force bearing capacity of the workbench 2 along the sub-shaft 31.

[0040] With reference to Figure 2 and Figure 3 , the first guide assembly 4 further comprises a plurality of first sliding blocks 43 slidably arranged on the first guide rail 41 and a plurality of second sliding blocks 44 slidably arranged on the second guide rail 42, the number of the first sliding blocks 43 in the embodiment of the application is 2, and the number of the second sliding blocks 44 is 2, the number of the first sliding blocks 43 in other embodiments of the application is 3, and the number of the second sliding blocks 44 is 3, one end of the first sliding block 43 away from the first guide rail 41 is fixedly connected with the workbench 2, and one end of the second sliding block 44 away from the second guide rail 42 is fixedly connected with the workbench 2; the first guide rail 41 is slidably provided with a plurality of first sliding blocks 43, the second guide rail 42 is slidably provided with a plurality of second sliding blocks 44, the first sliding block 43 and the second sliding block 44 are respectively fixedly connected with the workbench 2, thereby improving the load capacity of the sliding support of the workbench 2 and the reliability of the connection, and helping to reduce the relative displacement in the height direction between the workbench 2 and the bed body 1 caused by the load.

[0041] With reference to Figure 2The bottom of the workbench 2 is provided with a first mounting groove 21 for mounting a plurality of first sliding blocks 43 and a second mounting groove 22 for mounting a plurality of second sliding blocks 44. The length direction of the first mounting groove 21 is consistent with the length direction of the first guide rail 41, and the length direction of the second mounting groove 22 is consistent with the length direction of the second guide rail 42. One end of the first sliding block 43 away from the first guide rail 41 is fixedly installed at the bottom of the first mounting groove 21 by a screw, and one side wall of the first sliding block 43 abuts against the inner wall of the first mounting groove 21. One end of the second sliding block 44 away from the second guide rail 42 is fixedly installed at the bottom of the second mounting groove 22, and one side wall of the second sliding block 44 abuts against the inner wall of the second mounting groove 22. The first sliding block 43 is installed in the first mounting groove 21, and the second sliding block 44 is installed in the second mounting groove 22, thereby improving the firmness of the installation and connection of the first sliding block 43 and the second sliding block 44 on the workbench 2. One side wall of the first sliding block 43 abuts against the inner wall of the first mounting groove 21, and one side wall of the second sliding block 44 abuts against the inner wall of the second mounting groove 22, thereby improving the convenience of the installation of the first sliding block 43 and the second sliding block 44 in the first mounting groove 21 and the second mounting groove 22, and improving the reliability of the force transmission between the first sliding block 43, the second sliding block 44 and the workbench 2.

[0042] Referring to Figure 3 and Figure 4 , the countershaft box 3 is slidably installed on the workbench 2 along the axial direction of the countershaft 31 through a second guide assembly 5. The second guide assembly 5 includes a third guide rail 51 and a fourth guide rail 52 which are horizontally spaced apart and installed on the workbench 2. The installation height of the third guide rail 51 and the fourth guide rail 52 is arranged in steps. The second guide assembly 5 is arranged in steps in the height direction through the third guide rail 51 and the fourth guide rail 52 which are horizontally spaced apart, thereby increasing the support area of the countershaft box 3 on the workbench 2 along the radial direction of the countershaft 31, and helping to improve the load capacity of the installation structure of the countershaft box 3.

[0043] Referring to Figure 4 , the workbench 2 is provided with a third mounting surface 23 for mounting the third guide rail 51 and a fourth mounting surface 24 for mounting the fourth guide rail 52. The third mounting surface 23 is located on the side of the workbench 2 close to the lathe bed 1 where the workpiece to be machined is installed. The fourth mounting surface 24 is spaced apart from the third mounting surface 23 and arranged in the horizontal direction. The height of the fourth mounting surface 24 is higher than that of the third mounting surface 23. The third mounting surface 23 is located on the side of the workbench 2 close to the lathe bed 1 where the workpiece to be machined is installed, and is spaced apart from the fourth mounting surface 24 in the horizontal direction. The height of the fourth mounting surface 24 is higher than that of the third mounting surface 23, thereby helping to increase the support area of the countershaft box 3 on the workbench 2, and thus improving the load capacity of the countershaft box 3 when machining the workpiece.

[0044] Referring to Figure 4The third installation surface 23 is provided with a third positioning table 25 for transversely positioning the third guide rail 51, and the fourth installation surface 24 is provided with a fourth positioning table 26 for transversely positioning the fourth guide rail 52. The third positioning table 25 is located on the side of the third installation surface 23 close to the fourth installation surface 24, and the fourth positioning table 26 is located on the side of the fourth installation surface 24 close to the third installation surface 23. The third positioning table 25 transversely positions the third guide rail 51, and the fourth positioning table 26 transversely positions the fourth guide rail 52. Meanwhile, when the auxiliary shaft box 3 is subjected to a load in the radial direction of the auxiliary shaft 31, the third positioning table 25 supports the third guide rail 51 in the transverse direction, and the fourth positioning table 26 supports the fourth guide rail 52 in the transverse direction, thereby further improving the load bearing capacity of the auxiliary shaft box 3 in the radial direction of the auxiliary shaft 31.

[0045] With reference to Figure 2 and Figure 4 The second guide assembly 5 further comprises a plurality of third sliding blocks 53 slidingly arranged on the third guide rail 51 and a plurality of fourth sliding blocks 54 slidingly arranged on the fourth guide rail 52. In the embodiment of the application, the number of the third sliding blocks 53 is two, and the number of the fourth sliding blocks 54 is also two. In other embodiments of the application, the number of the third sliding blocks 53 is three, and the number of the fourth sliding blocks 54 is also three. The end of each third sliding block 53 away from the third guide rail 51 is fixedly connected with the auxiliary shaft box 3, and the end of each fourth sliding block 54 away from the fourth guide rail 52 is fixedly connected with the workbench 2. The third guide rail 51 is slidingly arranged with a plurality of third sliding blocks 53, and the fourth guide rail 52 is slidingly arranged with a plurality of fourth sliding blocks 54. The third sliding blocks 53 and the fourth sliding blocks 54 are respectively fixedly connected with the auxiliary shaft box 3, thereby improving the load bearing capacity and reliability of the sliding support of the auxiliary shaft box 3, and helping to reduce the relative displacement in the height direction between the auxiliary shaft box 3 and the workbench 2 due to the load.

[0046] With reference to Figure 4 The bottom of the auxiliary shaft box 3 is provided with a third installation groove 32 for installing a plurality of third sliding blocks 53 and a fourth installation groove 33 for installing a plurality of fourth sliding blocks 54. The end of each third sliding block 53 away from the third guide rail 51 is fixedly installed at the bottom of the third installation groove 32, and one side wall of the third sliding block 53 abuts against the inner wall of the third installation groove 32. One side wall of each fourth sliding block 54 abuts against the inner wall of the fourth installation groove 33. The third sliding blocks 53 are installed in the third installation groove 32, and the fourth sliding blocks 54 are installed in the fourth installation groove 33, thereby improving the firmness of the installation and connection of the third sliding blocks 53 and the fourth sliding blocks 54 on the auxiliary shaft box 3. One side wall of the third sliding block 53 abuts against the inner wall of the third installation groove 32, and one side wall of the fourth sliding block 54 abuts against the inner wall of the fourth installation groove 33, thereby improving the convenience of the installation of the third sliding blocks 53 and the fourth sliding blocks 54 in the third installation groove 32 and the fourth installation groove 33, and improving the reliability of the force transmission between the third sliding blocks 53 and the fourth sliding blocks 54 and the auxiliary shaft box 3.

[0047] The implementation principle of the embodiment is that by adopting the first guide assembly 4 and the second guide assembly 5, the workbench 2 and the countershaft box 3 can obtain better support and stability during sliding, thereby improving the load capacity and positioning accuracy of the countershaft 31 during machining of the workpiece, and improving the machining precision of the workpiece. Specifically, the first guide assembly 4 increases the support area of the bed body 1 to the workbench 2 along the axial direction of the countershaft 31 through the stepped arrangement of the first guide rail 41 and the second guide rail 42, improves the load bearing capacity of the workbench 2 along the axial direction of the countershaft 31, reduces the deformation of the workbench 2 relative to the bed body 1, and improves the machining precision of the workpiece. The second guide assembly 5 increases the support area of the countershaft box 3 on the workbench 2 along the radial direction of the countershaft 31 through the stepped arrangement of the third guide rail 51 and the fourth guide rail 52, and improves the load capacity of the countershaft box 3 during machining of the workpiece. In addition, by arranging the first positioning table 13, the second positioning table 14, the third positioning table 25 and the fourth positioning table 26, the stability and load capacity of the workbench 2 and the countershaft box 3 during sliding are further improved, thereby improving the positioning accuracy of the countershaft 31 during machining of the workpiece, and improving the machining precision of the workpiece.

[0048] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application in sequence, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sub-spindle mechanism of a machine tool, characterized by, The lathe comprises a lathe body (1), a worktable (2) and a sub-shaft box (3), the sub-shaft box (3) is provided with a rotatable sub-shaft (31), the sub-shaft box (3) is installed on the worktable (2), the worktable (2) is slidably connected with the lathe body (1) along a direction perpendicular to the sub-shaft (31) through a first guide assembly (4), the first guide assembly (4) comprises first and second guide rails (41, 42) which are installed on the lathe body (1) at intervals, and the installation height of the first guide rail (41) is arranged in steps with the installation height of the second guide rail (42).

2. The sub-spindle mechanism of a machine tool according to claim 1, characterized in that, The lathe body (1) is provided with a first installation surface (11) for installing the first guide rail (41) and a second installation surface (12) for installing the second guide rail (42), the first installation surface (11) is located at one end close to the chuck of the sub-shaft (31), the second installation surface (12) is located at the other end of the sub-shaft (31), and the height of the second installation surface (12) is higher than the height of the first installation surface (11).

3. The sub-spindle mechanism of a machine tool according to claim 2, characterized in that, The first installation surface (11) is provided with a first positioning table (13) for transversely positioning the first guide rail (41), and the second installation surface (12) is provided with a second positioning table (14) for transversely positioning the second guide rail (42), the first positioning table (13) is located at the side of the first installation surface (11) close to the second installation surface (12), and the second positioning table (14) is located at the side of the second installation surface (12) close to the first installation surface (11).

4. The sub-spindle mechanism of a machine tool according to claim 1, characterized by The first guide assembly (4) further comprises a plurality of first sliding blocks (43) slidably arranged on the first guide rail (41) and a plurality of second sliding blocks (44) slidably arranged on the second guide rail (42), one end of the first sliding block (43) away from the first guide rail (41) is fixedly connected with the worktable (2), and one end of the second sliding block (44) away from the second guide rail (42) is fixedly connected with the worktable (2).

5. The sub-spindle mechanism of a machine tool according to claim 4, characterized in that, The bottom of the worktable (2) is provided with a first installation groove (21) for installing a plurality of first sliding blocks (43) and a second installation groove (22) for installing a plurality of second sliding blocks (44), one end of the first sliding block (43) away from the first guide rail (41) is fixedly installed at the bottom of the first installation groove (21), one side wall of the first sliding block (43) abuts against the inner wall of the first installation groove (21), and one side wall of the second sliding block (44) abuts against the inner wall of the second installation groove (22).

6. The sub-spindle mechanism of a machine tool according to claim 1, characterized by The sub-shaft box (3) is slidably installed on the worktable (2) along the axial direction of the sub-shaft (31) through a second guide assembly (5), the second guide assembly (5) comprises third and fourth guide rails (51, 52) which are installed on the worktable (2) at intervals, and the installation height of the third guide rail (51) is arranged in steps with the installation height of the fourth guide rail (52).

7. The sub-spindle mechanism of a machine tool according to claim 6, characterized in that, The workbench (2) is provided with a third mounting surface (23) for mounting the third guide rail (51), and a fourth mounting surface (24) for mounting the fourth guide rail (52), the third mounting surface (23) is located on the side of the workbench (2) close to the bed (1) for mounting the workpiece to be processed, and the fourth mounting surface (24) is arranged in a spaced manner with the third mounting surface (23), and the height of the fourth mounting surface (24) is higher than that of the third mounting surface (23).

8. The sub-spindle mechanism of a machine tool according to claim 7, characterized in that, The third mounting surface (23) is provided with a third positioning table (25) for transversely positioning the third guide rail (51), and the fourth mounting surface (24) is provided with a fourth positioning table (26) for transversely positioning the fourth guide rail (52), the third positioning table (25) is located on the side of the third mounting surface (23) close to the fourth mounting surface (24), and the fourth positioning table (26) is located on the side of the fourth mounting surface (24) close to the third mounting surface (23).

9. The sub-spindle mechanism of a machine tool according to claim 6, characterized in that, The second guide assembly (5) further comprises a plurality of third sliding blocks (53) slidingly arranged on the third guide rail (51), and a plurality of fourth sliding blocks (54) slidingly arranged on the fourth guide rail (52), one end of the third sliding block (53) away from the third guide rail (51) is fixedly connected with the countershaft box (3), and one end of the fourth sliding block (54) away from the fourth guide rail (52) is fixedly connected with the countershaft box (3).

10. The sub-spindle mechanism of a machine tool according to claim 9, characterized in that, The bottom of the countershaft box (3) is provided with a third mounting groove (32) for mounting a plurality of third sliding blocks (53), and a fourth mounting groove (33) for mounting a plurality of fourth sliding blocks (54), one end of the third sliding block (53) away from the third guide rail (51) is fixedly installed at the bottom of the third mounting groove (32), one side wall of the third sliding block (53) abuts against the inner wall of the third mounting groove (32), one end of the fourth sliding block (54) away from the fourth guide rail (52) is fixedly installed at the bottom of the fourth mounting groove (33), and one side wall of the fourth sliding block (54) abuts against the inner wall of the fourth mounting groove (33).

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