CN204935204U - A fixture for a CNC lathe - Google Patents

Abstract

A clamp for a CNC lathe, comprising a clamp seat, a main body, a spring chuck, a support seat, a tapered sleeve, a positioning cylinder seat, a disc, a pull rod, a clamp block, a connecting bolt and a positioning cylinder; the clamp seat is fixed on a main shaft, the front end of the main body is fixedly connected to the clamp seat, the support seat is located in the main body, and the front end of the support seat is fixed on the clamp seat; the positioning cylinder seat is fixed on the rear end face of the support seat, the positioning cylinder is fixed on the rear end face of the positioning cylinder seat, an annular groove is provided on the inner wall of the rear end of the main body, and a tapered sleeve is installed in the annular groove. The present invention provides a clamp for a CNC lathe. During processing, the rotating workpiece will drive the spring chuck and the disc to rotate with the spherical bushing as the axis, thereby avoiding the rotation of the entire clamp in the traditional technology, which makes the stability of the clamp fixation worse, and causes the occurrence of eccentricity of the processed parts.

Description

A fixture for a CNC lathe

technical field

The utility model relates to a numerical control lathe, in particular to a fixture for a numerical control lathe.

Background technique

Numerical control lathes have been widely used in the bearing industry, and can be used for soft turning or hard turning. Regardless of soft turning or hard turning, the deformation of the workpiece during clamping is currently the most difficult problem to overcome. The inner and outer rings of bearings are ring-shaped parts. The clamping of the ring-type bearing ring by the fixture will inevitably lead to the deformation of the ring, resulting in an out-of-tolerance circular deviation of the workpiece. Although the precision of the CNC lathe is very high, it is difficult to process high-precision products because of the fixture.

In order to overcome the above-mentioned problems, a kind of CNC lathe fixture has been proposed in the existing technology. This kind of fixture moves forward and backward through the spring collet, and when moving, the conical surface of the spring collet contacts the conical surface of the conical sleeve. Even if the clamping force is too large, it will be offset by the taper surface of the collet; although this kind of fixture effectively overcomes the above technical problems, it is the whole work of this kind of fixture. The fixtures are all rotating. After working for a long time, due to the trembling of the fuselage during the processing of the workpiece, the fixation between the fixture and the lathe will be slightly loose. The rotating fixture will aggravate the looseness, resulting in irregular rotation of the fixture, that is, Not on the same trajectory, resulting in eccentricity of the processed parts, which seriously affects the accuracy of the parts.

Contents of the invention

In order to overcome the above problems, the utility model provides a fixture for a numerically controlled lathe that can overcome the poor precision of processed parts due to the looseness of the fixture.

In order to achieve the above object, the technical solution provided by the utility model is:

A fixture for a CNC lathe, comprising a fixture seat, a main body, a collet, a support seat, a tapered sleeve, a positioning cylinder seat, a disc, a pull rod, a clamp block, a connecting bolt, and a positioning cylinder; the fixture seat is fixed on the main shaft , the front end of the main body is fixedly connected with the fixture seat, the support seat is located in the main body, and the front end of the support seat is fixed on the fixture seat; the positioning cylinder seat is fixed on the rear end surface of the support seat, and the positioning cylinder is fixed on the rear end surface of the positioning cylinder seat On the inner wall of the rear end of the main body, there is an annular groove, and a taper sleeve is installed in the annular groove, and the inner wall of the taper sleeve is a tapered surface. The conical surface is in matching contact with the conical surface of the inner wall of the taper sleeve, and a clamp block is fixed on the inner wall of the rear end of the collet; the front end of the collet is connected with a disc, and a connecting hole is provided in the center of the disc, and the connecting hole is built-in There is a spherical bushing, the pull rod is located at the front end of the disc, the rear end of the pull rod is provided with a threaded hole, and the connecting bolt passes through the spherical bushing in the center of the disc and is screwed into the threaded hole of the pull rod.

An elastic layer is provided on the inner surface of the clamping block.

The inner tapered surface of the taper sleeve is a conical surface, and the tapered surface of the outer wall at the rear end of the collet is also a conical surface.

The inner tapered surface of the taper sleeve is a rectangular tapered surface, and the tapered surface of the outer wall at the rear end of the collet is also a conical surface.

The benefits of the above technical solution are:

The new model provides a fixture for CNC lathes. During processing, the rotating workpiece will drive the spring chuck and the disc to rotate with the spherical bushing as the axis, avoiding the rotation of the entire fixture in the traditional technology, and making the fixture stable. Poor performance, resulting in eccentricity of the processed parts and other phenomena.

Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described.

Description of drawings

Fig. 1 is the structure schematic diagram of the new embodiment 1;

Fig. 2 is a sectional view of the connecting bolt in Fig. 1 .

detailed description

Example 1

As shown in Figure 1-2, a fixture for CNC lathes includes a fixture seat 1, a main body 2, a spring chuck 3, a support seat 4, a tapered sleeve 5, a positioning cylinder seat 6, a disc 7, a pull rod 12, and a clamping block 8. Connect the bolt 9 and the positioning cylinder 10; the fixture seat 1 is fixed on the main shaft 11, the front end of the main body 2 is fixedly connected with the fixture seat 1, the support seat 4 is located in the main body 2, and the front end of the support seat 4 is fixed on the fixture seat 1; the positioning cylinder base 6 is fixed on the rear end surface of the support seat 4, the positioning cylinder 10 is fixed on the rear end surface of the positioning cylinder base 6, and an annular groove 20 is arranged on the inner wall of the rear end of the main body 2, and the annular groove 20 A conical sleeve 5 is installed inside, and the inner wall of the conical sleeve 5 is a conical surface. The collet 3 is sleeved in the main body 2. The tapered surfaces are matched and contacted, and a clip block 8 is fixed on the inner wall of the rear end of the collet 3 .

The front end of the collet 3 is connected with a disc 7, and the center of the disc 7 is provided with a connection hole, as shown in Figure 2, the connection hole is built with a spherical bushing 70, the pull rod 12 is located at the front end of the disc 7, and the pull rod The rear end of 12 is provided with a threaded hole, and the connecting bolt 9 passes through the spherical bushing 70 in the center of the disc 7 and is screwed into the threaded hole of the pull rod 12. The other end of the pull rod 12 is connected with the clamping cylinder of the lathe, which is the power of the clamp. source; the disk is fixed on the pull rod to realize the circular rotation of the disk around the spherical bushing, that is, the spring collet rotates; during processing, the rotating workpiece will drive the spring collet and the disk with the spherical bushing as the The rotation of the axis avoids the rotation of the entire fixture in the traditional technology, which deteriorates the stability of the fixation of the fixture and causes eccentricity of the processed parts.

In the present invention, an elastic layer is provided on the inner surface of the clamp block 8, and the elastic layer includes a rubber ring or a spring ring; through the arrangement of the elastic layer, it can be ensured that the surface of the workpiece will not be injured by the clamp.

In another embodiment of the present invention, the taper sleeve 5 can also be changed to a taper sleeve of other shapes, such as a rectangular tapered surface, and the tapered surface of the outer wall of the rear end of the collet is also set to a rectangular tapered surface. The arrangement of the rectangular conical surface can facilitate the fixing of workpieces of other shapes, and compared with the circular conical surface, it can be more convenient for fixing workpieces of irregular shapes.

Claims (4)

1. a numerically controlled lathe fixture, is characterized in that: comprise clamping fixture seat, main body, collet, supporting seat, conical sleeve, location cylinder base, disk, pull bar, fixture block, connecting bolt and positioning tube; Described clamping fixture seat is fixed on main shaft, and body front end is fixedly connected with clamping fixture seat, and supporting seat is positioned at main body, and the front end of supporting seat is fixed on clamping fixture seat; Described location cylinder base is fixed on the rear end face of supporting seat, positioning tube is fixed on the rear end face of location cylinder base, body rear inwall is provided with annular groove, annular groove is built with tapered sleeve, tapered sleeve inwall is the conical surface, and described collet is set in main body, and collet rear end outer wall is provided with the conical surface, this conical surface mates with the conical surface of tapered sleeve inwall and contacts, and the rear end inwall of collet is fixed with fixture block; The front end of described collet is connected with disk, the center of disk is provided with connecting hole, and connecting hole is built-in with spherical bushing, and pull bar is positioned at the front end of disk, the rear end of pull bar is provided with screwed hole, and connecting bolt screws in the screwed hole of pull bar through the spherical bushing of disc centre.

2. a kind of numerically controlled lathe fixture as claimed in claim 1, is characterized in that: on the inner surface of described fixture block, be provided with elastic layer.

3. a kind of numerically controlled lathe fixture as claimed in claim 1, is characterized in that: the inner conical surface of described tapered sleeve is taper seat, and the conical surface of collet rear end outer wall is also taper seat.

4. a kind of numerically controlled lathe fixture as claimed in claim 1, is characterized in that: the inner conical surface of described tapered sleeve is the rectangle conical surface, and the conical surface of collet rear end outer wall is also taper seat.