Center adjusting device

Abstract

A center adjusting device relates to the technical field of lathes and comprises a mounting sleeve, a mounting shaft, a screw and a nut, a mounting hole penetrating through the mounting sleeve in the radial direction of the mounting sleeve is formed in the mounting sleeve, the mounting hole extends towards the axial end of the mounting sleeve to form a mounting groove, the mounting shaft penetrates through the mounting hole, and the screw is arranged in the mounting groove. The mounting shaft is provided with a hole for inserting a tip, the screws are arranged at the two ends of the mounting shaft, and the nuts are arranged in screw-thread fit with the screws. The center is inserted into the hole of the mounting shaft, and the position of the mounting shaft relative to the mounting sleeve is adjusted by the aid of the screw and the nut, so that the position of the center relative to the mounting sleeve is adjusted, and the purpose of concentric adjustment of the center is finally achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lathes, in particular to a rear center adjusting device for a lathe. Background Art

[0002] The center is a machine tool component in machining. It has a tapered shank at the tail and uses its head cone to hold the workpiece, which can support parts with complex end faces and parts that do not allow center holes to be drilled. The centers are divided into front centers and rear centers, which are used for centering and bearing the gravity and cutting force of the workpiece. Among them, the front center is directly installed in the tapered hole of the lathe spindle, and the rear center is installed in the tapered hole of the tailstock sleeve of the lathe.

[0003] Generally, for the problem of the non-concentricity of the tailstock, the lathe tailstock is usually directly adjusted. However, the adjustment process of the tailstock is very cumbersome, requires high operation accuracy, is relatively slow during the adjustment process, and takes a lot of time. For the machining of some workpieces with small batches, small workpiece sizes, and small machining amounts, the adjustment of the center can be directly used to replace the adjustment of the tailstock.

[0004] Therefore, for the machining of workpieces with small batches, small workpiece sizes, and small machining amounts, a device that is more convenient for concentric adjustment of the center is needed to solve the defects of the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a center adjusting device, which directly adjusts the center through this adjusting device, improving the convenience of center adjustment.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A center adjusting device includes a mounting sleeve, a mounting shaft, a screw rod, and a nut. A mounting hole is formed in the mounting sleeve in the radial direction of the mounting sleeve and extends towards the axial end of the mounting sleeve to form a mounting groove. The mounting shaft is inserted into the mounting hole. A hole for inserting the center is provided on the mounting shaft. The screw rods are arranged at both ends of the mounting shaft, and the nut is arranged in threaded cooperation with the screw rod. By inserting the center into the hole of the mounting shaft and adjusting the position of the mounting shaft relative to the mounting sleeve with the help of the screw rod and the nut, the position of the center relative to the mounting sleeve is adjusted, and finally the purpose of concentric adjustment of the center is achieved.

[0008] Correspondingly, a threaded hole is provided on the circumferential side of the mounting sleeve, and a center drill is arranged to fit the threaded hole. After the mounting sleeve is sleeved outside the sleeve of the tailstock, the mounting sleeve and the sleeve are fixed by screwing the center drill into the threaded hole.

[0009] Correspondingly, a hole is provided at the axial center of the mounting shaft.

[0010] Correspondingly, a plurality of holes with different sizes are arranged at intervals, and each of the holes is not connected; by arranging a plurality of holes with different sizes, a plurality of centers with different sizes can be adapted;

[0011] Correspondingly, a set of opposite planes are provided on the circumferential side of the center; the center is limited by the planes, improving the stability of the center installation;

[0012] Correspondingly, the distance between a set of opposite planes gradually increases from the end far from the center shank to the end close to the center shank;

[0013] Correspondingly, the installation groove is a trapezoidal groove, and the distance between the trapezoidal grooves at the axial end is smaller than the distance between the trapezoidal groove and the adjacent installation hole; by accommodating part of the head through the trapezoidal groove and limiting the head, the head is prevented from axially disengaging from the trapezoidal groove.

[0014] The beneficial effects of the present utility model are as follows:

[0015] On the one hand, by inserting the center into the hole of the installation shaft and adjusting the position of the installation shaft relative to the installation sleeve by means of a screw and a nut, the position of the center relative to the installation sleeve is adjusted, and finally the purpose of concentric adjustment of the center is achieved, which simplifies the adjustment process compared with the method of adjusting the center concentricity through the tailstock; on the other hand, the head of the center is processed flat, making the insertion of the center more limited and improving the stability of the center insertion. Description of the Drawings

[0016] Figure 1 is a schematic side structure view of the installation sleeve according to an embodiment of the present utility model;

[0017] Figure 2 is a schematic top view structure view of the installation sleeve according to an embodiment of the present utility model;

[0018] Figure 3 is a schematic side structure view of the installation sleeve when the installation groove is an isosceles trapezoid in another embodiment of the present utility model;

[0019] Figure 4 is a schematic side structure view of the installation shaft according to an embodiment of the present utility model;

[0020] Figure 5 is a schematic side structure view of a normal center;

[0021] Figure 6 is a schematic side structure view of the center with a plane cut on the circumferential side of the center head according to an embodiment of the present utility model;

[0022] Figure 7It is a schematic side structure view of the tip whose plane presents an "eight" shape in another embodiment of the present utility model;

[0023] In the figure:

[0024] 1. Mounting sleeve; 11. Hollow structure; 12. Screw hole; 13. Mounting hole; 14. Mounting groove;

[0025] 2. Mounting shaft; 21. Hole;

[0026] 31. Screw; 32. Nut;

[0027] 4. Tip; 41. Plane. Specific embodiments

[0028] In the description of the present utility model, it should be understood that the terms indicating the orientation or the positional relationship are based on the orientation or the positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 to the present utility model.

[0029] The principles and features of the present utility model will be described below with reference to the drawings. The examples given are only for explaining the present utility model and are not used to limit the scope of the present utility model. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0030] In an embodiment of the present utility model, the tip adjusting device includes a mounting sleeve, a mounting shaft, a screw and a nut;

[0031] As Figure 1 and Figure 2 shown, in the axial direction of the mounting sleeve 1, one end is a hollow structure 11, and a screw hole 12 communicating with the hollow structure 11 is provided on the circumferential side corresponding to the hollow structure 11, so that the mounting sleeve 1 can be sleeved on the sleeve of the tailstock, and a thimble can be screwed in the screw hole 12 to realize the fixation of the mounting sleeve 1 and the sleeve. The other end has an end face, and a mounting hole 13 penetrating the mounting sleeve 1 in the radial direction of the mounting sleeve 1 is opened on the mounting sleeve 1 near the end face. The mounting hole 13 extends towards the axial end of the mounting sleeve 1 (i.e., the aforementioned end face) to form a mounting groove 14. The two side walls of the mounting groove 14 are parallel. That is, in this embodiment, the mounting hole 13 is a superior arc hole, and the mounting groove 14 is a rectangle. In other embodiments, as Figure 3 shown, the mounting groove 14 can also be set as a trapezoidal groove, and the spacing of the trapezoidal groove at the axial end is smaller than the spacing of the trapezoidal groove adjacent to the mounting hole 13, for example, an isosceles trapezoid;

[0032] Insert the mounting shaft 2 through the mounting hole 13. A hole 21 for inserting the center point 4 is provided on the mounting shaft 2. In this embodiment, as Figure 4 shown, a plurality of holes 21 with different sizes are provided at the axial center of the mounting shaft 2, and each hole 21 is not connected. By providing a plurality of holes 21 with different sizes, a plurality of center points 4 with different sizes can be adapted. Screws 31 are provided at both ends of the mounting shaft 2, and nuts 32 are provided in threaded cooperation with the screws 31;

[0033] The center point 4 includes a head and a shank. As Figure 5 shown, normally, the circumferential side of the center point 4 is all arc-shaped. In this embodiment, in order to adapt to the rectangular mounting groove 14, as Figure 6 shown, a set of opposite planes 41 are provided on the circumferential side of the center point 4. In other embodiments, for example, as Figure 7 shown, in order to adapt to the isosceles trapezoidal mounting groove 14, the distance between a set of opposite planes 41 gradually increases from the end far from the shank to the end close to the shank, that is, a set of opposite planes 41 presents an "eight" shape.

[0034] According to the center point adjusting device described in this embodiment, the following operation method can be obtained:

[0035] Insert the center point 4 into the suitable hole 21 on the mounting shaft 2. Insert one end of the mounting shaft 2 from one end of the mounting hole 13 and pass through from the other end of the mounting hole 13. Use the screws 31 and nuts 32 to realize the connection and fixation of the mounting shaft 2 and the mounting sleeve 1, and then use the center pin to realize the connection and fixation of the mounting sleeve 1 and the tail-end sleeve. The position of the center point 4 can be adjusted by rotating the nuts 32 at both ends.

[0036] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A top adjustment device, comprising a mounting sleeve, a mounting shaft, a screw and a nut, characterized in that: A mounting hole is provided on the mounting sleeve and passes through the mounting sleeve in a radial direction of the mounting sleeve. The mounting hole extends toward an axial end of the mounting sleeve to form a mounting groove. The mounting shaft is passed through the mounting hole. The mounting shaft is provided with a hole for inserting a center point. The screw rods are provided at both ends of the mounting shaft, and the nuts are provided to cooperate with the screw rod threads.

2. The top adjustment device according to claim 1, characterized in that: The circumferential side of the installation sleeve is provided with a screw hole, and an ejector pin is provided to match the screw hole.

3. The top adjustment device according to claim 1, characterized in that: A hole is arranged at the axial center of the installation shaft.

4. The top adjustment device according to claim 1 or 3, characterized in that: A plurality of holes of different sizes are arranged at intervals, and each of the holes is not connected.

5. The top adjustment device according to claim 1, characterized in that: The top has a set of opposite flat surfaces on its circumferential side.

6. The top adjustment device according to claim 5, characterized in that: The distance between a group of opposite planes gradually increases from an end far from the top tail handle to an end close to the top tail handle.

7. The top adjustment device according to claim 5, characterized in that: The mounting groove is a trapezoidal groove, and the spacing between the trapezoidal groove at the axial end is smaller than the spacing between the trapezoidal groove and the mounting hole at adjacent locations.

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