Special bar clamping suite for numerical control lathe

Abstract

The utility model discloses a special bar clamping suite for a numerically controlled lathe, which relates to the technical field of machine tool processing and comprises a spindle box, a three-jaw chuck is rotatably mounted in the spindle box, a plurality of clamping jaws are arranged on the three-jaw chuck, an abutting inclined plane is arranged on the inner wall of the three-jaw chuck, a clamping sleeve is arranged in the three-jaw chuck, and a plurality of clamping jaws are arranged on the clamping sleeve. A clamping sleeve is arranged between the three-jaw chuck and the round bar workpiece, one end of the clamping sleeve is in contact with the clamping jaws when the clamping sleeve is used, an extrusion face is arranged on the outer surface of the clamping sleeve, the extrusion face is in contact with an abutting inclined face on the inner wall of the three-jaw chuck when the clamping sleeve is used, and a positioning face is further arranged at one end of the clamping sleeve. According to the clamping device for the round bar workpiece, the clamping sleeve is deformed to clamp the round bar workpiece, in this way, the purpose of rapid clamping of the clamping sleeve can be achieved, the clamping area of the clamping sleeve can be increased, and then marks generated when the round bar workpiece is clamped are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tool processing, and discloses a special kit for clamping bar materials of a numerically controlled lathe. Background Art

[0002] In modern manufacturing, numerically controlled lathes, as important processing equipment, are widely used in the precision processing of various metal and non-metal materials. With the continuous improvement of the requirements for processing accuracy and efficiency in industrial production, many improvements have emerged in the clamping of lathes, such as pneumatic three-jaw chucks, electric three-jaw chucks, etc.

[0003] The Chinese utility model patent with the publication number of CN218192592U discloses an automatic material clamping and pulling device for a numerically controlled lathe. When this device clamps a bar material, the clamping force will automatically align and clamp different-sized bar materials at the bottom of the V-shaped groove, avoiding manual positioning and adjusting the spacing, and improving the degree of automation; at the same time, the specific structure of the clamping surface provides multi-angle clamping force, and the clamping is stable.

[0004] In the above device and the prior art, both change the three-jaw chuck, but still use the method of three-point jaws to position the workpiece. In this way, after the workpiece is clamped by the traditional three-jaw chuck during the processing, concave marks will appear on the surface of the workpiece. Although this phenomenon can be solved by placing copper sheets at the contact between the jaws and the workpiece, placing copper sheets will not only waste the loading and unloading efficiency, but also affect the coaxiality of the workpiece, resulting in a decrease in processing accuracy. Summary of the Utility Model

[0005] In view of the above technical problems, the present invention proposes the following technical solutions:

[0006] A special kit for clamping bar materials of a numerically controlled lathe includes a headstock. A three-jaw chuck is rotatably installed in the headstock. A plurality of jaws are arranged on the three-jaw chuck. A contact inclined surface is arranged on the inner wall of the three-jaw chuck. A clamping sleeve is arranged inside the three-jaw chuck. The material of the clamping sleeve is CR12 steel or CR13 steel. One end of the clamping sleeve contacts the jaw during use. An extrusion surface is arranged on the outer surface of the clamping sleeve. The extrusion surface contacts the contact inclined surface on the inner wall of the three-jaw chuck during the use of the clamping sleeve. A positioning surface is also arranged at one end of the clamping sleeve.

[0007] Further, the positioning surface contacts the inner wall of the three-jaw chuck, and the positioning surface is used to limit the axis of the clamping sleeve to coincide with the axis of the three-jaw chuck during use.

[0008] Further, a plurality of clamping grooves are provided on the positioning surface, a counterbore step is provided at one end of the clamping sleeve away from the positioning surface, a round bar workpiece is contact-mounted at the end of the clamping sleeve provided with the counterbore step, and one end of the round bar workpiece contacts the counterbore step.

[0009] Further, the outer wall of the counterbore step is in close contact with the inner wall of the clamping sleeve. A plurality of elastic gaps are evenly provided on the clamping sleeve. The elastic gaps are the gaps after the clamping sleeve is cut. The width of the elastic gaps is 1 centimeter to 1.5 centimeters.

[0010] Further, a stress relief groove is provided on the clamping sleeve. The stress relief groove is provided between the extrusion surface and the positioning surface. The stress relief groove is a through groove for reducing the stress after the clamping sleeve is deformed. The stress relief groove communicates with the elastic gap.

[0011] The beneficial effects of the present utility model compared with the prior art are as follows: (1) By arranging a clamping sleeve between the three-jaw chuck and the round bar workpiece, the clamping sleeve deforms to clamp the round bar workpiece, which can not only achieve the purpose of quickly clamping the clamping sleeve, but also increase the clamping area of the clamping sleeve, thereby reducing the marks generated when the round bar workpiece is clamped; (2) By arranging elastic gaps and stress relief grooves on the clamping sleeve, the elastic gaps absorb the displacement of the deformation of the clamping sleeve, so that the clamping sleeve can clamp the round bar workpiece after being squeezed and deformed. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0013] Figure 2 It is a schematic diagram of the elastic gap structure of the present utility model.

[0014] Figure 3 It is a schematic diagram of the structure of the clamping sleeve after sectioning of the present utility model.

[0015] Figure 4 It is a schematic diagram of the three-jaw chuck structure of the present utility model.

[0016] Figure 5 It is a schematic diagram of the three-jaw chuck and the clamping sleeve after sectioning of the present utility model.

[0017] Reference numerals: 101 - spindle box; 102 - three-jaw chuck; 103 - jaw; 104 - round bar workpiece; 201 - clamping sleeve; 202 - elastic gap; 204 - stress relief groove; 205 - clamping groove; 206 - counterbore step; 207 - extrusion surface; 208 - positioning surface. Detailed Embodiment

[0018] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0019] As Figure 1 shown in 3 to Figure 5 shown, a special kit for clamping bar materials of a numerically controlled lathe includes a headstock 101. A three-jaw chuck 102 is rotatably installed in the headstock 101. A plurality of jaws 103 are provided on the three-jaw chuck 102. A contact inclined surface is provided on the inner wall of the three-jaw chuck 102. A clamping sleeve 201 is arranged in the three-jaw chuck 102. The material of the clamping sleeve 201 is CR12 steel or CR13 steel. One end of the clamping sleeve 201 contacts the jaw 103 during use.

[0020] As Figures 1 to 5 shown, an extrusion surface 207 is provided on the outer surface of the clamping sleeve 201. The extrusion surface 207 contacts the contact inclined surface on the inner wall of the three-jaw chuck 102 during the use of the clamping sleeve 201. A positioning surface 208 is further provided at one end of the clamping sleeve 201. The positioning surface 208 contacts the inner wall of the three-jaw chuck 102. The positioning surface 208 is used to limit the axis of the clamping sleeve 201 to coincide with the axis of the three-jaw chuck 102 during use. A plurality of positioning grooves 205 are further provided on the positioning surface 208. A counterbore step 206 is provided at the end of the clamping sleeve 201 away from the positioning surface 208. A round bar workpiece 104 is contact-mounted at the end of the clamping sleeve 201 provided with the counterbore step 206. One end of the round bar workpiece 104 contacts the counterbore step 206. The outer wall of the counterbore step 206 is in close contact with the inner wall of the clamping sleeve 201. A plurality of elastic gaps 202 are uniformly provided on the clamping sleeve 201. The elastic gaps 202 are the gaps after the clamping sleeve 201 is cut. The width of the elastic gaps 202 is 1 - 1.5 cm. The elastic gaps 202 evenly divide the extrusion surface 207 into a plurality of surfaces. A relief groove 204 is further provided on the clamping sleeve 201. The relief groove 204 is provided between the extrusion surface 207 and the positioning surface 208. The relief groove 204 is a through groove for the purpose of reducing the stress after the clamping sleeve 201 is deformed. The relief groove 204 communicates with the elastic gaps 202.

[0021] Working principle: When using this device, it is necessary to first place the round rod workpiece 104 in the countersunk step 206 of the clamping sleeve 201. If the diameter of the round rod workpiece 104 is too large or too small, the clamping sleeves 201 of different sizes can be replaced for use, and then the clamping sleeve 201 with the round rod workpiece 104 installed is placed in the clamping claw 103. At this time, the extrusion surface 207 on the clamping sleeve 201 is in contact with the interference inclined surface in the three-jaw chuck 102, and the positioning surface 208 is also in contact with the inner wall of the three-jaw chuck 102, so that the axis of the clamping sleeve 201 and the three-jaw chuck 102 are aligned. At this time, the clamping claws 103 are manually driven to move multiple clamping claws 103 simultaneously toward the axis of the three-jaw chuck 102, so that the clamping claws 103 will squeeze the clamping sleeve 201. At one end, if the clamping sleeve 201 is not embedded in the three-jaw chuck 102, and the end of the clamping sleeve 201 that contacts the claw 103 is not flush with the end of the three-jaw chuck 102 where the claw 103 is provided, the claw 103 will squeeze the clamping sleeve 201, causing the clamping sleeve 201 to move away from the claw 103, so that the end of the clamping sleeve 201 where the elastic gap 202 is provided will be squeezed, and then the end of the clamping sleeve 201 where the elastic gap 202 is provided will be deformed, and at the same time, the width of the elastic gap 202 will be reduced, and at this time, the clamping sleeve 201 will completely hold the round rod workpiece 104. It is worth noting here that the claw 103 is not in contact with the outer surface of the round rod workpiece 104, and the clamping sleeve 201 is slightly elastically deformed when being squeezed.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A special kit for clamping bar stock on a numerically controlled lathe, comprising a headstock (101), a three-jaw chuck (102) is rotatably installed in the headstock (101), and a plurality of jaws (103) are arranged on the three-jaw chuck (102), and the characteristics are as follows: On the inner wall of the three-jaw chuck (102), there is a contact inclined surface. Inside the three-jaw chuck (102), there is a clamping sleeve (201). The material of the clamping sleeve (201) is CR12 steel or CR13 steel. One end of the clamping sleeve (201) contacts the jaw (103) during use. On the outer surface of the clamping sleeve (201), there is an extrusion surface (207). The extrusion surface (207) contacts the contact inclined surface on the inner wall of the three-jaw chuck (102) when the clamping sleeve (201) is in use. One end of the clamping sleeve (201) is also provided with a positioning surface (208).

2. The special kit for clamping bar stock of a numerically controlled lathe according to claim 1, wherein: The positioning surface (208) contacts the inner wall of the three-jaw chuck (102). The positioning surface (208) is used to limit the coincidence of the axis of the clamping sleeve (201) with the axis of the three-jaw chuck (102) during use.

3. The special kit for clamping bar stock of a numerically controlled lathe according to claim 1, characterized in that: On the positioning surface (208), there are also a plurality of clamping grooves (205). One end of the clamping sleeve (201) away from the positioning surface (208) is provided with a counterbore step (206). A round bar workpiece (104) is contact-mounted at the end of the clamping sleeve (201) with the counterbore step (206). One end of the round bar workpiece (104) contacts the counterbore step (206).

4. The special kit for clamping bar stock of a numerically controlled lathe according to claim 3, wherein: The outer wall of the counterbore step (206) is in close contact with the inner wall of the clamping sleeve (201). The clamping sleeve (201) is evenly provided with a plurality of elastic gaps (202). The elastic gaps (202) are the gaps after the clamping sleeve (201) is cut. The width of the elastic gaps (202) is 1 cm to 1.5 cm.

5. The special kit for clamping bar stock of a numerically controlled lathe according to claim 1, characterized in that: The clamping sleeve (201) is also provided with a stress relief groove (204). The stress relief groove (204) is arranged between the extrusion surface (207) and the positioning surface (208). The stress relief groove (204) is a through groove for reducing the stress after the deformation of the clamping sleeve (201). The stress relief groove (204) communicates with the elastic gaps (202).

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