Follow-up support for machining variable-pitch screw

Abstract

The utility model belongs to the technical field of rotary part machining, and discloses a follow-up support for variable pitch screw machining, a bearing bush, a centering chuck and a headstock mounting plate are mounted on a headstock, the centering chuck is annular, the bearing bush is fixedly mounted in the centering chuck, the outer side of the bearing bush is matched with the inner surface of the centering chuck, and the headstock mounting plate is mounted on the headstock. The inner side of the bearing bush is matched with the outer surface of a shaft of a screw, the center of the bearing bush is sleeved on the shaft of the screw, the centering chuck is fixedly connected with the headstock mounting plate, the headstock mounting plate is mounted on a headstock of a processing machine body, a jacket and a bearing are mounted on the tailstock, the bearing is mounted on the shaft of the screw, and the jacket is mounted outside the bearing and fixed on the tailstock. The follow-up support for machining the variable-pitch screw can be matched with a headstock and a tailstock to automatically center and rotate along with the screw, four-axis machining can be adopted for machining, redundant machining procedures are not needed, the machining time is greatly shortened, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining of rotary parts, and particularly relates to a follow-up support for machining a variable pitch screw. Background Art

[0002] When machining complex rotary parts, a four-axis machining center is required. A four-axis machining center is a multi-axis controlled and linked machining device. It can perform machining operations in a three-dimensional space coordinate system, has high-precision and high-speed machining capabilities, and can easily handle complex machining operations. Different from traditional three-axis machining equipment, a four-axis machining center can complete machining that cannot be achieved on a plane by rotating the workpiece or the tool, such as machining curved surfaces like spherical surfaces, inclined surfaces, tilted surfaces, and arc surfaces.

[0003] When machining screws with very high machining accuracy requirements, such as variable pitch screws, the commonly used clamping method of a four-axis machining center with one clamping and one supporting cannot adjust the absolute concentricity of both ends of the workpiece, resulting in a low qualified rate of the manufactured products and unable to meet the use requirements. For such high-precision parts, they are all machined by five-axis machining internationally, but five-axis machining equipment has a high cost and a more complex control process than four-axis machining equipment. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a follow-up support for machining a variable pitch screw to solve the above technical problems.

[0005] To achieve the above purpose, the specific technical solution of a follow-up support for machining a variable pitch screw of the utility model is as follows:

[0006] A follow-up support for machining a variable pitch screw includes a headstock and a tailstock. The shaft at the head end of the screw is installed on the headstock, and the shaft at the tail end of the screw is installed on the tailstock. An axle bush, a centering chuck, and a headstock mounting plate are installed on the headstock. The centering chuck is circular. The axle bush is fixedly installed inside the centering chuck. The outer side of the axle bush matches the inner surface of the centering chuck, and the inner side matches the outer surface of the shaft of the screw. The center of the axle bush is sleeved on the shaft of the screw. The centering chuck is fixedly connected to the headstock mounting plate. The headstock mounting plate is installed on the headstock of the machining body. The axle bush rotates with the shaft of the screw, and the headstock mounting plate rotates relative to the axis of the headstock. The axle bush is used to define the horizontal position of the shaft of the screw to make both ends of the screw absolutely concentric. A collet and a bearing are installed on the tailstock. The bearing is installed on the shaft of the screw, and the collet is installed outside the bearing and fixed on the tailstock.

[0007] Further, the centering chuck includes an upper centering chuck and a lower centering chuck. The inner surfaces of the upper centering chuck and the lower centering chuck are semi-circular arcs, and form a circular ring after being matched with each other.

[0008] Further, the upper centering chuck has a mounting step on its upper surface. There is a first mounting hole on the mounting step. At the corresponding position of the lower centering chuck and the upper centering chuck, there is a second mounting hole. The upper centering chuck and the lower centering chuck are fixedly connected to each other by a first fastener passing through the first mounting hole and the second mounting hole.

[0009] Further, the first fastener is a screw and nut. After the screw passes through the first mounting hole and the second mounting hole, it is fastened by a nut.

[0010] Further, the bearing bush includes an upper bearing bush and a lower bearing bush. The upper bearing bush and the lower bearing bush are fixedly installed between the centering chuck and the lower centering chuck. The upper bearing bush and the lower bearing bush cooperate to form a shape surrounding the shaft of the screw and can rotate with the rotation of the shaft.

[0011] Further, the upper bearing bush and the lower bearing bush have the same thickness.

[0012] Further, there is a third mounting hole in the radial direction of the upper bearing bush, and there are two fourth mounting holes in the radial direction of the lower bearing bush. The second fastener passes through the third mounting hole to fixedly install the upper bearing bush inside the upper centering chuck, and the second fastener passes through the fourth mounting hole to fixedly install the lower bearing bush inside the lower centering chuck.

[0013] Further, there are fixing holes on the end faces of the upper centering chuck and the lower centering chuck. The third fastener fixes the upper centering chuck and the lower centering chuck on the headstock mounting plate through the fixing holes.

[0014] A follow-up support for variable pitch screw processing of the present utility model has the following advantages: The follow-up support for variable pitch screw processing of the present utility model can cooperate with the headstock and tailstock to automatically center and rotate with the screw. It can be processed by four-axis machining, without redundant processing procedures, with higher automation, reducing the time of manual operation, saving labor costs, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic side structure diagram of the follow-up support of the present utility model;

[0016] Figure 2 It is a schematic front structure diagram of the headstock of the present utility model;

[0017] Description of the markings in the figure: 1. Bearing bush; 11. Upper bearing bush; 111. Third mounting hole; 12. Lower bearing bush; 121. Fourth mounting hole; 13. Second fastener; 2. Centering chuck; 21. Upper centering chuck; 211. Mounting step portion; 212. First mounting hole; 22. Lower centering chuck; 23. First fastener; 24. Third fastener; 221. Second mounting hole; 3. Headstock mounting plate; 4. Screw; 41. Shaft; 5. Headstock; 6. Tailstock; 7. Bush; 8. Bearing. Detailed implementation mode

[0018] In order to better understand the purpose, structure and function of the present invention, the following further describes in detail a follow-up support for variable pitch screw machining according to the present invention with reference to the accompanying drawings.

[0019] As Figure 1 Figure 2 shown, a follow-up support for variable pitch screw machining according to the present invention includes a headstock 5 and a tailstock 6. The shaft 41 at the head end of the screw 4 is mounted on the headstock 6, and the shaft 41 at the tail end of the screw 4 is mounted on the tailstock 6. A bearing bush 1, a centering chuck 2 and a headstock mounting plate 3 are mounted on the headstock 5. The centering chuck 2 is circular. The bearing bush 1 is fixedly mounted inside the centering chuck 2. The outer side of the bearing bush 1 matches the inner surface of the centering chuck 2, and the inner side matches the outer surface of the shaft 41 of the screw 4. The center of the bearing bush 1 is sleeved on the shaft 41 of the screw 4. The centering chuck 2 is fixedly connected to the headstock mounting plate 3. The headstock mounting plate 3 is mounted on the headstock 5 of the processing machine body. The bearing bush 1 rotates with the shaft 41 of the screw 4, and the headstock mounting plate 3 rotates relative to the axis of the headstock 5. The bearing bush 1 is used to define the horizontal position of the shaft 41 of the screw 4, so that the two ends of the screw 4 are absolutely concentric. A bush 7 and a bearing 8 are mounted on the tailstock 6. The bearing 8 is mounted on the shaft 41 of the screw 4, and the bush 7 is mounted outside the bearing 8 and fixed on the tailstock 6.

[0020] Specifically, the centering chuck 2 includes an upper centering chuck 21 and a lower centering chuck 22. The inner surfaces of the upper centering chuck 21 and the lower centering chuck 22 are semi-circular arcs and form a circular ring after being matched with each other. The upper surface of the upper centering chuck 21 has a mounting step portion 211, and the mounting step portion 211 has a first mounting hole 212. The lower centering chuck 22 has a second mounting hole 221 at the corresponding position of the upper centering chuck 21. The upper centering chuck 21 and the lower centering chuck 22 are fixedly connected to each other by a first fastener 23 passing through the first mounting hole 212 and the second mounting hole 221. The split centering chuck 2 is convenient for installation and does not need to lift the screw 4, and can be sleeved up and down.

[0021] Preferably, the first fastener 23 is a screw and nut. The screw passes through the first mounting hole 212 and the second mounting hole 221 and is fixedly connected by a nut.

[0022] The bearing shell 1 includes an upper bearing shell 11 and a lower bearing shell 12. The upper bearing shell 11 and the lower bearing shell 12 are fixedly installed between the upper centering chuck 21 and the lower centering chuck 22. The upper bearing shell 11 and the lower bearing shell 12 cooperate to form a shape surrounding the shaft 41 of the screw rod 4 and can rotate with the rotation of the shaft 41. The upper bearing shell 11 and the lower bearing shell 12 have the same thickness. The upper bearing shell 11 and the lower bearing shell 12 are special parts. According to the different shaft diameters of the shaft 41, bearing shells 1 with different thicknesses need to be matched, and according to different center heights, bearing shells 1 with different heights need to be matched.

[0023] The upper bearing shell 11 has an installation hole three 111 in the radial direction, and the lower bearing shell 12 has two installation holes four 121 in the radial direction. The fastener two 13 passes through the installation hole three 111 to fixedly install the upper bearing shell 11 inside the upper centering chuck 21. The fastener two 13 passes through the installation hole four 121 to fixedly install the lower bearing shell 12 inside the lower centering chuck 22.

[0024] The upper centering chuck 21 and the lower centering chuck 22 have fixing holes on their end faces. The fastener three 24 fixes and installs the upper centering chuck 21 and the lower centering chuck 22 on the headstock mounting plate 3 through the fixing holes.

[0025] The headstock mounting plate 3 is installed on the headstock 5 and rotates relative to the axis of the headstock 5.

[0026] During installation, first install the upper bearing shell 11 on the upper centering chuck 21; install the lower bearing shell 12 on the lower centering chuck 22; then install them together on the shaft 41 at the front end of the screw rod 4 and tighten. Then install the headstock mounting plate 3 on the headstock 5. Finally, put the previously installed centering chuck 2 on the headstock mounting plate 5. The headstock 5 centers with the bearing shell 1, and then the shaft 41 of the screw rod 4 is installed on the centering chuck 2 to complete centering and can rotate with the product to adjust to different machining positions. Then install the bearing 8 on the shaft 41 at the rear end of the screw rod 4, then put on the jacket 7, and finally install the shaft 41 together with the jacket 7 on the tailstock 6 to make the shaft 41 concentric with the tailstock 6.

[0027] It can be understood that the present utility model is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A follow-up support for variable pitch screw machining, comprising a headstock (5) and a tailstock (6), the shaft (41) at the head end of the screw (4) is mounted on the headstock (5), and the shaft (41) at the tail end of the screw (4) is mounted on the tailstock (6), characterized in that, A bearing bush (1), a centering chuck (2) and a headstock mounting plate (3) are installed on the headstock (5). The centering chuck (2) is annular. The bearing bush (1) is fixedly installed in the centering chuck (2). The outer side of the bearing bush (1) matches the inner surface of the centering chuck (2), and the inner side matches the outer surface of the shaft (41) of the screw rod (4). The center of the bearing bush (1) is sleeved on the shaft (41) of the screw rod (4). The centering chuck (2) is fixedly connected to the headstock mounting plate (3). The headstock mounting plate (3) is installed on the headstock of the processing machine body. The bearing bush (1) rotates with the shaft (41) of the screw rod (4). The headstock mounting plate (3) rotates relative to the axis (41) of the headstock. The bearing bush (1) is used to define the horizontal position of the shaft (41) of the screw rod (4) to make the two ends of the screw rod (4) absolutely concentric. A collet (7) and a bearing (8) are installed on the tailstock (6). The bearing (8) is installed on the shaft (41) of the screw rod (4). The collet (7) is installed outside the bearing (8) and fixed on the tailstock (6).

2. The follow-up bracket for variable pitch screw machining according to claim 1, characterized in that, The centering chuck (2) includes an upper centering chuck (21) and a lower centering chuck (22). The inner surfaces of the upper centering chuck (21) and the lower centering chuck (22) are semi-circular arcs and form an annular shape after being matched with each other.

3. The follow-up support for variable pitch screw machining according to claim 2, characterized in that, The upper surface of the upper centering chuck (21) has a mounting step portion (211). The mounting step portion (211) has a first mounting hole (212). The lower centering chuck (22) has a second mounting hole (221) at a corresponding position to the upper centering chuck (21). The upper centering chuck (21) and the lower centering chuck (22) are fixedly connected to each other by a first fastener (23) passing through the first mounting hole (212) and the second mounting hole (221).

4. The follow-up support for variable pitch screw machining according to claim 3, characterized in that, The first fastener (23) is a screw and nut. The screw passes through the first mounting hole (212) and the second mounting hole (221) and is fastened by a nut.

5. The follow-up support for variable pitch screw machining according to claim 2, characterized in that, The bearing bush (1) includes an upper bearing bush (11) and a lower bearing bush (12). The upper bearing bush (11) and the lower bearing bush (12) are fixedly installed between the centering chuck (2) and the lower centering chuck (22). The upper bearing bush (11) and the lower bearing bush (12) cooperate to form a shape surrounding the shaft (41) of the screw rod (4) and can rotate with the rotation of the shaft (41).

6. The follow-up support for variable pitch screw machining according to claim 5, characterized in that, The upper bearing bush (11) and the lower bearing bush (12) have the same thickness.

7. The follow-up support for variable pitch screw machining according to claim 5, characterized in that, The upper bearing bush (11) has a third mounting hole (111) in the radial direction. The lower bearing bush (12) has two fourth mounting holes (121) in the radial direction. The second fastener (13) passes through the third mounting hole (111) to fixedly install the upper bearing bush (11) on the inner side of the upper centering chuck (21). The second fastener (13) passes through the fourth mounting holes (121) to fixedly install the lower bearing bush (12) on the inner side of the lower centering chuck (22).

8. The follow-up support for variable pitch screw machining according to claim 2, characterized in that, The upper centering chuck (21) and the lower centering chuck (22) have fixing holes on their end faces. The third fastener (24) fixes the upper centering chuck (21) and the lower centering chuck (22) on the headstock mounting plate (3) through the fixing holes.

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