Expansion mandrel clamp for numerical control lathe

Abstract

The utility model discloses an expansion mandrel clamp for a numerically controlled lathe, which comprises a main mounting shaft capable of mounting a handle or a motor to provide driving force; the transmission mechanism is connected with the main mounting shaft; the two supporting shafts are respectively distributed at two ends of the main mounting shaft; the locking parts are arranged on the supporting shafts, elastic supporting structures are arranged at the contact positions of the locking parts and the pipe fitting, and a clamping area is formed between the two supporting shafts through the multiple locking parts. The expansion core shaft clamp for the numerical control lathe is simple in structure, the two supporting shafts are connected through the transmission mechanism, two workpieces can be abutted tightly at the same time, and working efficiency is effectively improved; the outer side of the expansion sleeve is sleeved with an elastic pad or elastic particles, so that the expansion sleeve can be prevented from being damaged due to direct contact with the inner wall of the pipe fitting; and meanwhile, a clamping area is formed by the multiple locking parts on the two supporting shafts, the special-shaped workpiece can be clamped or loosened according to the diameter change of the expansion sleeve, and the application range is wide.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a mandrel clamp for CNC lathes. Background Technology

[0002] A fixture is a device used in mechanical manufacturing to fix a workpiece in the correct position for machining or inspection; it is also called a clamp. Broadly speaking, any device used to quickly, conveniently, and safely install a workpiece at any stage of the manufacturing process can be called a fixture. For fixtures used on CNC lathes, to facilitate the clamping and machining of tubular parts, expansion mandrel fixtures are typically used. These fixtures achieve clamping by pressing against the inner wall of the tubular part.

[0003] A search revealed that utility model patent CN207086948U discloses a combined adjustable internal expansion mandrel fixture for CNC lathes. The fixture includes a support shaft, ejector pins at both ends of the support shaft, multiple support units on the support shaft, and a connecting unit at one end of the support shaft. During operation, the workpiece is sleeved on the outside of the support shaft and fixed by the support units. The ejector pins are connected to the spindle and tailstock of the CNC lathe, respectively, and the support shaft is connected to the spindle of the CNC machine tool via the connecting unit. This prior art changes the traditional two-stage clamping process to a single clamping, improving efficiency. By rotating the locking nut and the elastic expansion mandrel, different positioning lengths can be achieved, adapting to workpieces of different lengths, thus increasing applicability. However, this prior art also has the following shortcomings: First, directly clamping the pipe fitting with the expansion sleeve after repeated use will cause wear on the surface of the expansion sleeve and the inner wall of the pipe fitting, thereby reducing friction and decreasing the clamping effect; second, this fixture can only clamp one pipe fitting at a time, resulting in low processing efficiency.

[0004] Based on the above-mentioned technical problems, those skilled in the art urgently need to develop a CNC lathe expansion mandrel fixture that has a simple structure, can effectively prevent damage to the expansion sleeve and workpiece, and can clamp two workpieces at a time. Utility Model Content

[0005] The purpose of this invention is to provide a CNC lathe expansion mandrel clamp that has a simple structure, can effectively prevent damage to the expansion sleeve and workpiece, and can clamp two workpieces at a time.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a mandrel clamp for a CNC lathe, the clamp comprising:

[0008] The main mounting shaft can be fitted with a handle or motor to provide driving force;

[0009] a transmission mechanism connected to the main mounting shaft;

[0010] two support shafts, respectively distributed at two ends of the main mounting shaft, and following the main mounting shaft to rotate in the same direction through the transmission mechanism, and each of the support shafts being able to be connected to a main shaft of the numerical control machine tool through a center pin;

[0011] The clamp further comprises:

[0012] a locking part provided on the support shaft, the locking part abutting against the pipe to be machined, the locking part having an elastic support structure at the contact position with the pipe, and the two support shafts forming a clamping area through the plurality of locking parts.

[0013] Further, the transmission mechanism comprises a main gear connected to the main mounting shaft; and

[0014] two transmission gears distributed at two ends of the main gear and in gear engagement with the main gear;

[0015] each of the transmission gears being provided with a secondary gear at an end away from the main gear, the secondary gear being in gear engagement with the transmission gear, and the two secondary gears being connected to the two support shafts, respectively.

[0016] Further, the support shaft is provided with an external thread, and the locking part is connected to the support shaft through the external thread.

[0017] Further, the locking part comprises a swelling core, a locking sleeve and a tapered abutting sleeve connected to the support shaft through threads; wherein

[0018] the swelling core is provided with a tapered hole, and the tapered abutting sleeve is extended into or withdrawn from the tapered hole along with the rotation of the support shaft, so that the diameter of the tapered hole changes;

[0019] the swelling core is provided with a swelling sleeve outside, the swelling sleeve deforming along with the change of the swelling core, so as to abut against or release the pipe to be machined;

[0020] the locking sleeve is located at the rear side of the swelling core, and is used for locking the swelling core.

[0021] Preferably, the swelling sleeve is made of hard rubber material, and the swelling sleeve is provided with an elastic pad outside, the elastic pad being made of soft rubber material.

[0022] Preferably, the swelling sleeve is provided with a plurality of anti-skid particles made of natural rubber material outside.

[0023] In the above technical solution, the numerical control lathe swelling core shaft clamp has the following beneficial effects:

[0024] The utility model discloses a kind of expansion core axle clamps for numerical control lathe, two supporting shafts are connected by transmission mechanism, two workpieces can be simultaneously pressed, effectively improve work efficiency;And one side elastic pad or set elastic particle is set on the outside of expansion sleeve, expansion sleeve and pipe inner wall can be avoided direct contact and be damaged;At the same time, a clamping area is formed by multiple locking parts on two supporting shafts, according to the diameter change of expansion sleeve, special-shaped workpiece can be clamped or loosened, and the scope of application is wide. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the technical personnel in the art better understand the technical scheme of the present application, the following will be further described in detail with reference to the drawings.

[0026] Figure 1 The overall structure of the utility model provides a kind of expansion core axle clamp for numerical control lathe top view;

[0027] Figure 2 The utility model provides a kind of expansion core axle clamp supporting shaft and locking part section view for numerical control lathe;

[0028] Figure 3 The utility model provides a kind of expansion core axle clamp locking part different structure schematic view for numerical control lathe;

[0029] Figure 4 The utility model provides a kind of expansion core axle clamp for numerical control lathe Figure 2 Enlarged view of A in middle.

[0030] Mark explanation:

[0031] 1, main installation shaft;2, transmission mechanism;3, supporting shaft;4, locking part;5, clamping area;

[0032] 201, main gear;202, transmission gear;203, secondary gear;

[0033] 401, expansion core;402, locking sleeve;403, expansion sleeve;404, taper pressing sleeve;405, elastic pad;406, anti-slip particle. DETAILED DESCRIPTION

[0034] In order to make the technical personnel in the art better understand the technical scheme of the present application, the following will be further described in detail with reference to the drawings.

[0035] Referring to Figures 1-4 As shown in the figure;

[0036] The utility model discloses a kind of expandable core shaft clamps for numerical control lathe, the clamp includes:

[0037] Main installation shaft 1, handle or motor can be installed thereon to provide driving force;

[0038] Transmission mechanism 2, connect with the main installation shaft 1;

[0039] Two support shafts 3 are respectively distributed at the both ends of the main installation shaft 1, and are followed by the main installation shaft 1 to rotate in the same direction through the transmission mechanism 2, and each support shaft 3 can be connected with the main shaft of numerical control machine tool through thimble;

[0040] The clamp further includes:

[0041] Locking portion 4 is provided on the support shaft 3, and the locking portion 4 is abutted against the pipe to be processed, the locking portion 4 has an elastic support structure at the contact position with the pipe, and a plurality of locking portions 4 are arranged between the two support shafts 3 to form a clamping area 5.

[0042] As a further introduction of the embodiment, the transmission mechanism 2 includes a main gear 201 connected to the main installation shaft 1;And

[0043] Two transmission gears 202 are distributed at the both ends of the main gear 201 and are engaged with the main gear 201;

[0044] Each transmission gear 202 is provided with a secondary gear 203 at one end away from each other, the secondary gear 203 is engaged with the transmission gear 202, and the two secondary gears 203 are connected to the two support shafts 3 respectively. It should be noted that the rotation direction of the two transmission gears 202 is opposite to the rotation direction of the main gear 201, and the secondary gear 203 is arranged to realize the purpose of rotating in the same direction as the main gear 201.

[0045] As a further introduction of the embodiment, the support shaft 3 is provided with external threads, and the locking portion 4 is connected to the support shaft 3 through the external threads.

[0046] As a further introduction of the embodiment, the locking portion 4 includes an expandable core 401, a locking sleeve 402 and a tapered abutting sleeve 404 which are threadedly connected to the support shaft 3;Among them,

[0047] The expandable core 401 is provided with a tapered hole, and the tapered abutting sleeve 404 is extended into or withdrawn from the tapered hole along with the rotation of the support shaft 3, so that the diameter of the tapered hole changes;

[0048] The expandable core 401 is provided with an expansion sleeve 403 outside, and the expansion sleeve 403 deforms along with the change of the expandable core 401 to abut or release the pipe to be processed;

[0049] The locking sleeve 402 is located at the rear side of the expansion core 401, and is used for locking the expansion core 401.

[0050] As the preferred technical solution of the embodiment, the expansion sleeve 403 is made of hard rubber material, and an elastic pad 405 made of soft rubber material is sleeved outside the expansion sleeve 403.

[0051] As the preferred technical solution of the embodiment, the outside of the expansion sleeve 403 is provided with a plurality of anti-skid particles 406 made of natural rubber. It should be noted that in the embodiment, the expansion sleeve 403 is made of hard rubber material and can be deformed along with the expansion core 401. In the machining work, the expansion sleeve is a consumable product, but the stretching degree and the fit degree of the expansion sleeve after several uses are more moderate, and the use effect is better, so the expansion sleeve will not be replaced frequently. In order to better protect the expansion sleeve, the elastic pad 405 and the anti-skid particles 406 are provided in the embodiment, which can be selected according to actual needs.

[0052] In the above technical solution, the utility model provides a kind of expansion core shaft clamp for numerical control lathe, with following beneficial effects:

[0053] The expansion core shaft clamp for numerical control lathe is simple in structure, and two workpieces can be simultaneously abutted by the two supporting shafts connected by the transmission mechanism, so that the working efficiency is effectively improved. The elastic pad or the elastic particles is sleeved outside the expansion sleeve, so that the expansion sleeve and the inner wall of the pipe are prevented from being damaged by direct contact. Meanwhile, a clamping area is formed by the multiple locking parts on the two supporting shafts, so that the special-shaped workpiece can be clamped or loosened according to the diameter change of the expansion sleeve, and the application range is wide.

[0054] The above only describes some exemplary embodiments of the utility model by way of illustration, and it is needless to say that the described embodiments can be modified in various ways without departing from the spirit and scope of the utility model for ordinary skilled in the art. Therefore, the above drawings and description are illustrative in nature and should not be understood as limiting the scope of protection of the utility model claims.

Claims

1. A live center spindle clamp for a CNC lathe, characterized by, The clamp comprises: a main mounting shaft (1) on which a handle or a motor can be mounted to provide driving force; a transmission mechanism (2) connected with the main mounting shaft (1); two support shafts (3) respectively distributed at two ends of the main mounting shaft (1) and following the main mounting shaft (1) to rotate in the same direction through the transmission mechanism (2), and each support shaft (3) can be connected with a main shaft of a numerical control machine tool through a center pin; The clamp further comprises: locking parts (4) provided on the support shafts (3) and abutting against a pipe to be machined through the locking parts (4), the locking parts (4) having elastic support structures at the contact positions with the pipe, and a clamping area (5) being formed between the two support shafts (3) through a plurality of the locking parts (4).

2. A live center spindle clamp for a CNC lathe as claimed in claim 1, wherein, The transmission mechanism (2) comprises a main gear (201) connected with the main mounting shaft (1); and two transmission gears (202) distributed at two ends of the main gear (201) and meshing with the main gear (201); each transmission gear (202) is provided with a secondary gear (203) at an end away from the other, the secondary gear (203) meshing with the transmission gear (202), and the two secondary gears (203) being connected with the two support shafts (3) respectively.

3. A live center chuck for a CNC lathe as claimed in claim 1, wherein, The support shaft (3) is provided with external threads, and the locking part (4) is connected with the support shaft (3) through the external threads.

4. A live center chuck for a CNC lathe as claimed in claim 1, wherein, The locking part (4) comprises a swelling core (401) threadedly connected with the support shaft (3), a locking sleeve (402) and a tapered abutting sleeve (404); wherein the swelling core (401) is provided with a tapered hole, and the tapered abutting sleeve (404) extends into or exits the tapered hole along with the rotation of the support shaft (3) to change the diameter of the tapered hole; the swelling core (401) is provided with a swelling sleeve (403) outside, the swelling sleeve (403) deforming along with the change of the swelling core (401) to abut against or release the pipe to be machined; the locking sleeve (402) is located at the rear side of the swelling core (401) and used for locking the swelling core (401).

5. A live center chuck for a CNC lathe as claimed in claim 4, wherein, The swelling sleeve (403) is made of hard rubber material, and the swelling sleeve (403) is provided with an elastic pad (405) outside, the elastic pad (405) being made of soft rubber material.

6. A live center chuck for a CNC lathe as claimed in claim 4, wherein, The swelling sleeve (403) is provided with a plurality of anti-skid particles (406) made of natural rubber material outside.

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