Positioning tool and machining device for precision gear milling of round head worm shaft

Abstract

The utility model discloses a positioning tool and processing device for the precise tooth milling of round head worm shaft relates to machining technical field, including the tail top cover of connecting on the base, the tail top cover one side is set to open structure, and the other side is provided with the mounting hole, the tail top cover is installed with semicircle tail top, and the semicircle tail top one end is installed in the mounting hole, and the other end is connected with the top plate through the bearing, and the tail top cover opening place is connected with the threaded plug of screw thread, and the threaded plug is connected with the top plate between the elastic part. The structure of this positioning tool is simple, convenient to operate in actual use process, and the auxiliary method is also simple, solve the problem that round head worm shaft can not adopt center hole positioning tooth milling, also solve the problem that the worm shaft is too long and jumps when milling, thereby improve the precision of round head worm shaft tooth milling.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a positioning fixture and machining device for precision milling of round-head worm gear shafts. Background Technology

[0002] Milling the teeth of a screw shaft involves the cutting tool milling the teeth from top to bottom. Therefore, the machine tool will give the worm shaft a feed force from top to bottom and a forward extrusion force. As a result, large runout is prone to occur when machining the middle part of a long-shaft worm. Generally, when designing, users will leave the teeth at one end of the shaft and retain the center hole to improve accuracy and meet requirements.

[0003] Currently, some users require the worm shaft to have rounded ends and the teeth moved towards the center due to specific needs. The rounded ends are to reduce friction, changing surface contact to point contact, and then gradually returning to surface contact after mutual wear, thereby increasing the accuracy and service life of the worm shaft.

[0004] However, current round-head worm shafts cannot use center hole positioning for gear milling, and the worm shafts are too long, making them prone to runout during gear milling, resulting in low precision in round-head worm shaft gear milling. Utility Model Content

[0005] The technical problem this invention aims to solve is that current round-head worm shafts cannot be milled using a center hole for positioning, and the worm shafts are too long, making them prone to runout during milling, resulting in low milling accuracy. Based on this, this invention proposes a positioning fixture and machining device for precision milling of round-head worm shafts. This positioning fixture is easy to operate and has simple auxiliary methods, solving the problem of round-head worm shafts not being able to be milled using a center hole for positioning, and also solving the runout problem when milling long worm shafts, thereby improving the milling accuracy of round-head worm shafts.

[0006] This utility model is achieved through the following technical solution: In a first aspect, this application provides a positioning fixture for precision milling of round-head worm gear shafts, including a tail sleeve connected to a base. One side of the tail sleeve is configured as an open structure, and the other side is provided with a mounting hole. A semi-circular tail tip is installed inside the tail sleeve. One end of the semi-circular tail tip is installed in the mounting hole, and the other end is connected to a top plate through a bearing. A threaded plug is threadedly connected to the opening of the tail sleeve, and an elastic element is installed between the threaded plug and the top plate.

[0007] The positioning fixture has a simple structure, is easy to operate in actual use, and has simple auxiliary methods. It solves the problem that the round-head worm shaft cannot be positioned for milling using the center hole, and also solves the problem of runout when milling the worm shaft when it is too long, thereby improving the milling accuracy of the round-head worm shaft.

[0008] Furthermore, the gap between the outer diameter of the semi-circular tail tip installed in the mounting hole and the mounting hole is less than 0.01 mm.

[0009] Furthermore, an auxiliary fixing structure is also connected to the base.

[0010] Furthermore, the auxiliary fixing structure includes an auxiliary semi-circular sleeve connected to the base, and the auxiliary semi-circular sleeve is provided with a through hole for the worm shaft to pass through.

[0011] By further connecting an auxiliary fixing structure to the base, the auxiliary fixing structure and the tail sleeve can work together to initially ensure axial runout through the semi-circular tail sleeve. The auxiliary semi-circular sleeve can provide support in the opposite direction of the feed force and extrusion force of the milling cutter, avoiding large runout of the worm shaft during machining. The two work together to ensure the stability of the machining accuracy.

[0012] Furthermore, the auxiliary semicircular sleeve is mounted on the base via a detachable connector.

[0013] Furthermore, the detachable connector includes a bolt assembly.

[0014] The auxiliary semicircular sleeve is installed on the base via a detachable connector, which facilitates its installation and removal.

[0015] Alternatively, detachable connectors can also be other detachable structures, such as threaded connections.

[0016] Furthermore, the clearance between the through hole on the auxiliary semicircular sleeve and the outer diameter of the worm shaft is less than 0.02 mm.

[0017] Furthermore, the elastic element includes a spring. However, besides springs, other elastic structures can also be used as the elastic element, and it is not limited to springs alone.

[0018] Installing a spring between the top plate and the threaded plug allows the spring to compress when the bolt plug is tightened. The elastic force generated by the spring compression causes the semi-circular tail tip to move towards one end of the worm shaft, thereby bringing the semi-circular end of the semi-circular tail tip into contact with the end of the worm shaft and achieving positioning of the worm shaft.

[0019] Furthermore, the tail sleeve is connected to the base via a bolt assembly.

[0020] The tail top sleeve is connected to the base by a bolt assembly, which also makes the tail top sleeve easy to disassemble and install.

[0021] Secondly, this application provides a machining apparatus for precision milling of round-head worm shafts, including the aforementioned positioning fixture.

[0022] Compared with the prior art, this utility model has the following advantages and beneficial effects: (1) The positioning fixture in this application has a simple structure, is easy to operate in actual use, and has simple auxiliary methods. It solves the problem that the round-head worm shaft cannot be positioned by the center hole for milling, and also solves the problem of runout when the worm shaft is too long for milling, thereby improving the milling accuracy of the round-head worm shaft.

[0023] (2) The positioning fixture of this application can be further connected to the base by an auxiliary fixing structure. The auxiliary fixing structure works in conjunction with the tail sleeve. The semi-circular tail sleeve can initially ensure the axial runout. The auxiliary semi-circular sleeve can provide support in the opposite direction of the feed force and extrusion force of the milling cutter, so as to avoid large runout of the worm shaft during processing. The two complement each other to ensure the stability of the accuracy after processing.

[0024] (3) In this application, the auxiliary semi-circular sleeve and the tail top sleeve are both installed on the base through detachable connectors, which facilitates the installation and removal of the auxiliary semi-circular sleeve and the tail top sleeve. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a positioning fixture for precision milling of round-head worm gear shafts according to the present invention. Figure 2 for Figure 1 The left view; Figure 3 This is a schematic diagram of the semi-circular tail top structure in this utility model; Figure 4 This is a right view of the novel tail sleeve. Figure 5 This is a left view of the auxiliary semicircular sleeve in this utility model.

[0026] The attached diagram shows the markings and corresponding component names: 1-Cladle, 2-Worm shaft, 3-Auxiliary semi-circular sleeve, 4-Tail top sleeve, 5-Semi-circular tail top, 6-Bearing, 7-Top plate, 8-Spring, 9-Threaded plug, 10-Screw one, 11-Screw two, 12-Base, 13-Machine tool tailstock, 14-Screw three, 15-Mounting hole, 16-Through hole. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a joint, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0031] like Figures 1-5 As shown, this embodiment provides a positioning fixture for precision milling of round-head worm gear shafts, including a tail sleeve 4 connected to a base 12. The base 12 and the tail sleeve 4 are connected by a screw 11. The base 12 is connected to a machine tool tailstock 13, and the base 12 and the machine tool tailstock 13 are connected by a screw 14. One side of the tail sleeve 4 is set with an open structure, and the other side is provided with a mounting hole 15. A semi-circular tail tip 5 is installed inside the tail sleeve 4. One end of the semi-circular tail tip 5 is installed in the mounting hole 15, and the other end is connected to a top plate 7 through a bearing 6. A threaded plug 9 is threadedly connected to the opening of the tail sleeve 4. A spring 8 is installed between the threaded plug 9 and the top plate 7. When the bolt plug is tightened, the spring 8 is compressed. The elastic force generated by the compression of the spring 8 causes the semi-circular tail tip 5 to move towards one end of the worm gear shaft 2, thereby making the semi-circular end of the semi-circular tail tip 5 contact the end of the worm gear shaft 2, and realizing the positioning of the worm gear shaft 2.

[0032] Specifically, the gap between the outer diameter of the semi-circular tail tip 5 installed in the mounting hole 15 and the mounting hole 15 is less than 0.01mm. When drilling the mounting hole 15 on the semi-circular tail tip 5, the inner diameter of the mounting hole 15 is controlled according to the size of the semi-circular tail tip 5 to be installed in the mounting hole 15, so that there is a certain gap between the semi-circular tail tip 5 and the mounting hole 15 after it is installed in the mounting hole 15, but this gap needs to be less than 0.01mm.

[0033] Specifically, an auxiliary fixing structure is also connected to the base 12; the auxiliary fixing structure includes an auxiliary semi-circular sleeve 3 connected to the base 12, and the auxiliary semi-circular sleeve 3 is provided with a through hole 16 for the worm shaft 2 to pass through; the auxiliary semi-circular sleeve 3 is installed on the base 12 by screws 10. By further connecting the auxiliary fixing structure to the base 12, the auxiliary fixing structure and the tail sleeve 4 can work together to initially ensure axial runout through the semi-circular tail sleeve 5, and the auxiliary semi-circular sleeve 3 can provide support in the opposite direction of the feed force and extrusion force of the milling cutter, avoiding large runout of the worm shaft 2 during machining. The two work together to ensure the stability of the machining accuracy. Installing the auxiliary semi-circular sleeve 3 on the base 12 through a detachable connector facilitates the installation and removal of the auxiliary semi-circular sleeve 3.

[0034] Specifically, the clearance between the through hole 16 on the auxiliary semi-circular sleeve 3 and the outer diameter of the worm shaft 2 is less than 0.02 mm. When drilling the through hole 16 on the auxiliary semi-circular sleeve 3, the inner diameter of the through hole 16 is controlled according to the outer diameter of the worm shaft 2 to be installed in the through hole 16, so that there is a certain clearance between the worm shaft 2 and the through hole 16 after installation, but this clearance needs to be less than 0.02 mm.

[0035] When installing the positioning fixture, place the semi-circular tail top 5, bearing 6 and top plate 7 into the tail top sleeve 4, then press the spring 8 into the tail top sleeve 4 with the threaded plug 9, then connect the tail top sleeve 4 to the base 12 with screw three 14, then connect the auxiliary semi-circular sleeve 3 to the base 12 with screw one 10, and finally connect the base 12 to the machine tool tailstock 13 with screw two.

[0036] During machining, the worm shaft 2 is inserted into the machine tool spindle sleeve 1 and locked. The program controls the machine tool tailstock 13 to advance and press against the other round end of the worm shaft 2. The coaxiality of the machine tool semi-circular tailstock 5 and the worm shaft 2 is adjusted, and then the gap between the auxiliary semi-circular sleeve 3 and the worm shaft 2 is adjusted to be less than 0.02mm. After adjustment, it is fixed and locked, and stable machining can be carried out. The semi-circular tailstock 5 initially ensures the axial runout, and the auxiliary semi-circular sleeve 3 can provide support in the opposite direction of the feed force and extrusion force of the milling cutter, ensuring that the worm shaft 2 does not run out a lot during machining. The two work together to ensure the stability of the accuracy after machining.

[0037] The positioning fixture has a simple structure, is easy to operate in actual use, and has simple auxiliary methods. It solves the problem that the round-head worm shaft 2 cannot be positioned for milling using the center hole, and also solves the problem of runout when milling the worm shaft 2 when it is too long, thereby improving the milling accuracy of the round-head worm shaft 2. Example 2

[0038] Based on Embodiment 1, this embodiment provides a machining apparatus for precision milling of round-head worm shafts. This apparatus uses the positioning fixture from Embodiment 1 to position the round-head worm shaft. Because the positioning fixture from Embodiment 1 is used, this machining apparatus allows the round-head worm shaft 2 to be milled using a center hole, solving the problem of runout when milling excessively long worm shaft 2, thereby improving the milling accuracy of the round-head worm shaft 2.

[0039] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A positioning tool for precision gear milling of a round head worm shaft, characterized in that, Includes a tail top sleeve (4) connected to the base (12), one side of the tail top sleeve (4) is configured as an open structure, and the other side is provided with a mounting hole (15); a semi-circular tail top (5) is installed inside the tail top sleeve (4), one end of the semi-circular tail top (5) is installed in the mounting hole (15), and the other end is connected to a top plate (7) through a bearing (6); a threaded plug (9) is threadedly connected to the opening of the tail top sleeve (4), and an elastic element is installed between the threaded plug (9) and the top plate (7).

2. The positioning tool for precisely milling the teeth of a round-end worm shaft according to claim 1, characterized in that, The gap between the outer diameter of the semi-circular tail tip (5) installed in the mounting hole (15) and the mounting hole (15) is less than 0.01 mm.

3. The positioning tool for precisely milling the teeth of a round-end worm shaft according to claim 1, characterized in that, An auxiliary fixing structure is also connected to the base (12).

4. A positioning fixture for precision milling of round-head worm gear shafts according to claim 3, characterized in that, The auxiliary fixing structure includes an auxiliary semi-circular sleeve (3) connected to the base (12), and the auxiliary semi-circular sleeve (3) is provided with a through hole (16) for the worm shaft (2) to pass through.

5. The positioning tool for precisely milling the teeth of a round-end worm shaft according to claim 4, characterized in that, The auxiliary semicircular sleeve (3) is mounted on the base (12) via a detachable connector.

6. The positioning tool for precision gear milling of a round-end worm shaft according to claim 5, wherein The detachable connector includes a bolt assembly.

7. The positioning tool for precision gear milling of a round-end worm shaft according to claim 4, wherein The clearance between the through hole (16) on the auxiliary semicircular sleeve (3) and the outer diameter of the worm shaft (2) is less than 0.02 mm.

8. The positioning tool for precision gear milling of a round-end worm shaft according to claim 1, wherein The elastic element includes a spring (8).

9. The positioning tool for precision gear milling of a round-end worm shaft according to claim 1, wherein The tail sleeve (4) is connected to the base (12) by a bolt assembly.

10. A machining device for precision gear milling of a round head worm shaft, characterized in that, Includes the positioning fixture described in any one of claims 1 to 9.

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