A distance fine-tuning mechanism and a machine tool

Abstract

A distance fine-tuning mechanism includes a lead screw, on which a composite nut and a push nut are respectively screwed. The composite nut includes an outer nut and an inner nut, the inner nut is installed on the outer nut, and at least part of the inner nut is located outside the outer nut; wherein, a driving mechanism is connected to this part of the inner nut located outside the outer nut, and the composite nut can move along the lead screw under the drive of the driving mechanism. The present application provides a distance fine-tuning mechanism that can realize the fine-tuning of the center distance between two components through a single lead screw; wherein, the components can be workpieces, saddle, workbench, etc.

Description

Technical Field

[0001] The present invention relates to the field of machine tools and their components, and particularly relates to a distance fine-tuning mechanism and a machine tool. Background Art

[0002] Currently, the ball screws and nuts of numerical control machine tools are directly installed on the nut seats of each main component (such as the saddle, workbench, or spindle box, etc.) to drive components such as the saddle, workbench, or spindle box to move linearly. Currently, the connection between the ball screw nut and the nut seat of the machine tool is a fixed connection. After being locked, they are integrated. When the screw rotates, the nut moves and then drives the main component (saddle, workbench, or spindle box, etc.) to move.

[0003] However, for some double-spindle vertical or horizontal machining centers equipped with double saddles or double workbenches, the distance between the two spindles is fixed. If there is a slight error between the center distance of the two workpieces to be machined and the distance between the two spindles, it will have a very obvious impact on the machining accuracy of the workpiece. If precise adjustment of the center distance is required, it is quite troublesome. Especially when the accuracy requirements of the workpiece are very high, it even needs to be frequently adjusted automatically through commands to meet the requirements, and the existing ball screw nuts obviously cannot achieve fine-tuning of the center distance between two workpieces (or double saddles, double workbenches) on one screw. Summary of the Invention

[0004] In order to solve the defects existing in the above-mentioned prior art, the present application provides a distance fine-tuning mechanism that can achieve fine-tuning of the center distance between two components through one screw; wherein, the components can be workpieces, saddles, workbenches, etc.

[0005] In order to achieve the above technical effects, the specific technical solution of the present invention is as follows:

[0006] A distance fine-tuning mechanism includes a screw, on which a composite nut and a push nut are respectively screwed. The composite nut includes an outer nut and an inner nut. The inner nut is installed on the outer nut, and at least part of the inner nut is located outside the outer nut; wherein, this part of the inner nut located outside the outer nut is connected with a driving mechanism, and the composite nut can move along the screw under the drive of the driving mechanism.

[0007] Preferably, the inner nut is coaxially installed on one side end of the outer nut, with a part installed inside the outer nut and another part extending outside the outer nut.

[0008] Preferably, the driving mechanism adopts a gear train transmission mechanism, a worm and worm gear transmission mechanism, or a belt transmission mechanism.

[0009] Preferably, the outer nut and the inner nut are of an integral structure.

[0010] Preferably, the outer nut and the inner nut are a split structure capable of linkage.

[0011] Among them, when the lead screw rotates, the composite nut and the push nut translate on the lead screw simultaneously, and at this time, the distance between the composite nut and the push nut remains unchanged.

[0012] For the convenience of description and understanding, assume that when the lead screw does not rotate, if it is necessary to adjust the distance between the composite nut and the push nut, the driving mechanism drives the inner nut to rotate, and the position of the entire composite nut on the lead screw will move, while the position of the push nut on the lead screw remains unchanged at this time, so as to achieve the effect of adjusting the distance between the composite nut and the push nut.

[0013] Similarly, when the lead screw rotates, the distance between the above two nuts can also be adjusted according to the above principle.

[0014] After the distance between the two nuts is adjusted, the two nuts can translate simultaneously under the drive of the lead screw. At this time, due to the cooperation between the inner nut and the driving mechanism, as long as the driving mechanism remains stationary, the distance between the composite nut and the push nut remains unchanged.

[0015] Based on the above technical solution, the present invention also provides a machine tool, and its technical solution is as follows:

[0016] A machine tool includes a first base, a first column, and a distance fine-tuning mechanism as described in the above technical solution. Two first X-axis guide rails arranged side by side are provided on the first base. A saddle A and a saddle B are slidably installed on the two first X-axis guide rails. The lead screw is arranged between the two first X-axis guide rails. The push nut is fixedly connected to the saddle A. A numerical control turntable A is slidably installed on the saddle A through a Z-axis guide rail A. A workbench A is installed on the numerical control turntable A; the outer nut is fixedly connected to the saddle B. A numerical control turntable B is slidably installed on the saddle B through a Z-axis guide rail B. A workbench B is installed on the numerical control turntable B; the first column is installed on one side of the first base. A horizontal spindle box A and a horizontal spindle box B that slide up and down are respectively installed on the first column through two groups of first Y-axis guide rails. A horizontal spindle A and a horizontal spindle B are respectively installed on the horizontal spindle box A and the horizontal spindle box B.

[0017] Among them, the workbench A and the workbench B are respectively on the numerical control turntable A and the numerical control turntable B and can rotate in the horizontal plane. When the machine tool is machining, two workpieces are respectively on the workbench A and the workbench B, move back and forth with the numerical control turntables A and B, move left and right with the saddles A and B, cooperate with the up and down movement of the horizontal spindle boxes A and B, and the in-plane rotation of the workbenches A and B. The horizontal spindles A and B drive the cutting tools to rotate to machine each side of the workpiece.

[0018] When the precision requirements of the workpiece are relatively high, the error between the distance between the rotation centers of the two workpieces and the center distance between the horizontal spindles A and B will significantly affect the machining precision of the workpiece. At this time, the function of the composite nut can be utilized to finely adjust the center distance between the two workpieces, so that both workpieces simultaneously machined by the double spindles can meet the technical requirements in terms of precision.

[0019] Based on the above technical solution, the present invention also provides a machine tool, and its technical solution is as follows:

[0020] A machine tool includes a second base, a second column, and a distance fine adjustment mechanism as described in the above technical solution. Two second Y-axis guide rails arranged side by side are provided on the second base. A saddle is slidably mounted on the two second Y-axis guide rails. Two second X-axis guide rails perpendicular to the second Y-axis guide rails are provided side by side on the saddle. A first worktable and a second worktable are slidably mounted on the two second X-axis guide rails. A lead screw is arranged between the two second X-axis guide rails. The push nut is fixedly connected to the first worktable, and the outer nut is fixedly connected to the second worktable. The second column is installed on one side edge of the second base. An upright spindle box A and an upright spindle box B that slide up and down are respectively installed on the second column through two groups of Z-axis guide rails. An upright spindle A and an upright spindle B are respectively installed on the upright spindle box A and the upright spindle box B.

[0021] According to the above technical solution, the distance fine adjustment mechanism of the present invention can drive two independent components with one lead screw, and can realize the adjustment of the distance between the two components, especially suitable for the situation where two spindles of a double-spindle machining center simultaneously machine two workpieces, and can finely adjust the distance between the two saddles or the distance between the two worktables. Brief Description of the Drawings

[0022] The following further elaborates on the present application in detail through specific embodiments in conjunction with the drawings.

[0023] Figure 1 It is a schematic diagram of Embodiment 1;

[0024] Figure 2 It is a schematic diagram of Embodiment 2;

[0025] Figure 3 It is a schematic diagram of Embodiment 3;

[0026] Figure 4 It is a schematic diagram of Embodiment 4;

[0027] Among them, 1. lead screw; 2. composite nut; 3. push nut; 4. outer nut; 5. inner nut; 6. drive mechanism; 7. first base; 8. first column; 9. first X-axis guide rail; 10. saddle A; 11. saddle B; 12. Z-axis guide rail A; 13. numerical control turntable A; 14. workbench A; 15. Z-axis guide rail B; 16. numerical control turntable B; 17. workbench B; 18. first Y-axis guide rail; 19. horizontal spindle box A; 20. horizontal spindle box B; 21. horizontal spindle A; 22. horizontal spindle B; 23. second base; 24. second column; 25. second Y-axis guide rail; 26. saddle; 27. second X-axis guide rail; 28. first workbench; 29. second workbench; 30. Z-axis guide rail; 31. vertical spindle box A; 32. vertical spindle box B; 33. vertical spindle A; 34. vertical spindle B. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of this implementation manner clearer, the technical solutions in this implementation manner will be clearly and completely described below with reference to the accompanying drawings in this implementation manner. Obviously, the described implementation manner is a part rather than all of the implementation manners of this application. Based on the implementation manners in this invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

[0029] In the description of this invention, it should be understood that the orientation or positional relationships indicated by the terms "upper end", "lower end", "tail end", "left and right", "up and down", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0030] In addition, the terms "first", "second", "large", "small", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "large", "small", etc. may explicitly or implicitly include one or more of such features.

[0031] In this invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this invention can be understood according to specific circumstances.

[0032] Example 1

[0033] Reference Figure 1 , a distance fine-tuning mechanism, including a lead screw 1, on which a composite nut 2 and a push nut 3 are respectively screwed. The composite nut 2 includes an outer nut 4 and an inner nut 5. The inner nut 5 is coaxially installed at one side end of the outer nut 4, with a part of it installed inside the outer nut and the other part extending to the outside of the outer nut. Among them, the part of the inner nut located outside the outer nut is connected to a driving mechanism 6, and the composite nut can move along the lead screw under the drive of the driving mechanism.

[0034] Among them, the driving mechanism adopts a gear set transmission mechanism. The gear set transmission mechanism is a common transmission structure in this industry and will not be elaborated here.

[0035] Example 2

[0036] Reference Figure 2 , a distance fine-tuning mechanism, including a lead screw 1, on which a composite nut 2 and a push nut 3 are respectively screwed. The composite nut 2 includes an outer nut 4 and an inner nut 5. The inner nut 5 is coaxially installed at one side end of the outer nut 4, with a part of it installed inside the outer nut and the other part extending to the outside of the outer nut. Among them, the part of the inner nut located outside the outer nut is connected to a driving mechanism 6, and the composite nut can move along the lead screw under the drive of the driving mechanism.

[0037] Among them, the driving mechanism adopts a worm and worm gear transmission mechanism. The worm and worm gear transmission mechanism is a common transmission structure in this industry and will not be elaborated here.

[0038] Example 3

[0039] Reference Figure 3, a machine tool, comprising a first base 7, a first column 8 and a distance fine-tuning mechanism as described in the above technical solution. Two first X-axis guide rails 9 arranged side by side are provided on the first base 7. A saddle A 10 and a saddle B 11 are slidably mounted on the two first X-axis guide rails 9. The lead screw 1 is arranged between the two first X-axis guide rails 9. The push nut 3 (not shown in the figure) is fixedly connected to the saddle A 10. A numerical control turntable A 13 is slidably mounted on the saddle A 10 through a Z-axis guide rail A 12. A workbench A 14 is mounted on the numerical control turntable A 13. The outer nut 4 is fixedly connected to the saddle B 11. A numerical control turntable B 16 is slidably mounted on the saddle B 11 through a Z-axis guide rail B 15. A workbench B 17 is mounted on the numerical control turntable B 16. The first column 8 is mounted on one side edge of the first base. Two sets of first Y-axis guide rails 18 are respectively provided on the first column for slidably mounting a horizontal spindle box A 19 and a horizontal spindle box B 20 which slide up and down. A horizontal spindle A 21 and a horizontal spindle B 22 are respectively mounted on the horizontal spindle box A and the horizontal spindle box B.

[0040] Embodiment 4

[0041] Reference Figure 4 , a machine tool, comprising a second base 23, a second column 24 and a distance fine-tuning mechanism as described in the above technical solution. Two second Y-axis guide rails 25 arranged side by side are provided on the second base 23. A saddle 26 is slidably mounted on the two second Y-axis guide rails 25. Two second X-axis guide rails 27 perpendicular to the second Y-axis guide rails are provided side by side on the saddle 26. A first workbench 28 and a second workbench 29 are slidably mounted on the two second X-axis guide rails 27. The lead screw 1 is arranged between the two second X-axis guide rails 27. The push nut 3 (not shown in the figure) is fixedly connected to the first workbench 28. The outer nut 4 is fixedly connected to the second workbench 29. The second column 24 is mounted on one side edge of the second base. Two sets of Z-axis guide rails 30 are respectively provided on the second column for slidably mounting a vertical spindle box A 31 and a vertical spindle box B 32 which slide up and down. A vertical spindle A 33 and a vertical spindle B 34 are respectively mounted on the vertical spindle box A and the vertical spindle box B.

[0042] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the technical field to which the present invention pertains, based on the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A distance fine-tuning mechanism, characterized in that, it includes a lead screw, on which a compound nut and a push nut are respectively screwed. The compound nut includes an outer nut and an inner nut. The inner nut is installed on the outer nut, and at least part of the inner nut is located outside the outer nut. Wherein, a driving mechanism is connected to this part of the inner nut located outside the outer nut, and the compound nut can move along the lead screw under the drive of the driving mechanism.

2. The distance fine-tuning mechanism according to claim 1, characterized in that, the inner nut is coaxially installed at one side end of the outer nut, with a part installed inside the outer nut and another part extending outside the outer nut.

3. The distance fine-tuning mechanism according to claim 1, characterized in that, the driving mechanism adopts a gear train transmission mechanism, a worm and worm gear transmission mechanism or a belt transmission mechanism.

4. The distance fine-tuning mechanism according to claim 1, characterized in that, the outer nut and the inner nut are of a split structure that can be linked.

5. A machine tool, characterized in that, it includes a first base, a first column and the distance fine-tuning mechanism according to any one of claims 1 to 4. Two first X-axis guide rails arranged side by side are provided on the first base. A saddle A and a saddle B are slidably installed on the two first X-axis guide rails. The lead screw is arranged between the two first X-axis guide rails. The push nut is fixedly connected to the saddle A. A numerical control turntable A is slidably installed on the saddle A through a Z-axis guide rail A. A workbench A is installed on the numerical control turntable A. The outer nut is fixedly connected to the saddle B. A numerical control turntable B is slidably installed on the saddle B through a Z-axis guide rail B. A workbench B is installed on the numerical control turntable B. The first column is installed on one side edge of the first base. A horizontal spindle box A and a horizontal spindle box B that slide up and down are respectively installed on the first column through two groups of first Y-axis guide rails. A horizontal spindle A and a horizontal spindle B are respectively installed on the horizontal spindle box A and the horizontal spindle box B.

6. A machine tool, characterized in that, it includes a second base, a second column and the distance fine-tuning mechanism according to any one of claims 1 to 4. Two second Y-axis guide rails arranged side by side are provided on the second base. A saddle is slidably installed on the two second Y-axis guide rails. Two second X-axis guide rails perpendicular to the second Y-axis guide rails are arranged side by side on the saddle. A first workbench and a second workbench are slidably installed on the two second X-axis guide rails. The lead screw is arranged between the two second X-axis guide rails. The push nut is fixedly connected to the first workbench. The outer nut is fixedly connected to the second workbench. The second column is installed on one side edge of the second base. A vertical spindle box A and a vertical spindle box B that slide up and down are respectively installed on the second column through two groups of Z-axis guide rails. A vertical spindle A and a vertical spindle B are respectively installed on the vertical spindle box A and the vertical spindle box B.

Images