CN211708118U

CN211708118U - External clamping centre

Info

Publication number: CN211708118U
Application number: CN202020221796.4U
Authority: CN
Inventors: 叶建平; 葛建伟; 杨梅
Original assignee: Zhejiang Headman Intelligent Equipment Co ltd
Current assignee: Zhejiang Headman Intelligent Equipment Co ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-10-20
Anticipated expiration: 2030-02-27

Abstract

The utility model provides an it is top to press from both sides outward belongs to clamping technical field. The problems that the contact area of an existing centre and a shaft workpiece is small and machining errors are increased easily are solved. It includes the body, the body front end is clamping end, clamping end terminal surface is equipped with the shrinkage pool, it presss from both sides the cover to be provided with elasticity along body endwise slip in the shrinkage pool, elasticity presss from both sides cover front end opening and rear end closure, the elasticity presss from both sides the cover lateral part and runs through the type groove that is provided with a plurality of messenger's elasticity and presss from both sides the cover front end and forms a plurality of lamella column structures, the elasticity presss from both sides the cover periphery wall and is the external diameter from the front end conical surface that reduces gradually to the rear end, shrinkage pool internal perisporium is the conical surface the same with elasticity presss from both. The device has the advantages of large contact area with shaft workpieces, high processing precision, firm connection and the like.

Description

External clamping centre

Technical Field

The utility model belongs to the technical field of the clamping, it is top to relate to, especially relate to the outer clamp is top.

Background

The shaft workpiece with a certain length is often used in cooperation with the tip when being machined on a machine tool, the tip is fixed on the tailstock, one end of the shaft workpiece is clamped by a hydraulic chuck of a main shaft of the machine tool, and then the tailstock is controlled to drive the tip to move and tightly prop against the other end face of the shaft workpiece. The tip part is pointed, generally speaking, for the shaft type workpieces with central holes on the end surfaces, the conventional tip can be inserted into the central holes on the end surfaces of the shaft type workpieces through the taper of the end part, and plays a role in centering and propping.

However, for some shaft workpieces with a plane end face, the center is directly pressed against the plane, and only point matching is formed between the center and the plane, so that the centering effect on the shaft workpieces is poor, and the machining error is easily increased. In addition, the point matching means that the contact area is only one point, and the contact area is small, so that the shaft-type workpiece is easy to slide during machining, and the machining precision and the clamping stability of the shaft-type workpiece are influenced.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, it is top to have proposed the outer clamp, has solved the technical problem little, the easy messenger machining error increase with axle type work piece area of contact.

The purpose of the utility model can be realized by the following technical proposal:

it is top to press from both sides outward, which comprises a body, the body front end be for pressing from both sides tight end, its characterized in that, the tight end terminal surface of clamp be equipped with the shrinkage pool, be provided with the elastic clamping cover along body endwise slip in the shrinkage pool, elastic clamping cover front end opening and rear end are sealed, the elastic clamping cover lateral part runs through the type groove that is provided with a plurality of messenger elastic clamping cover front ends and forms a plurality of lamella column structures, the elastic clamping cover periphery wall is the conical surface that the external diameter reduces gradually from the front end to the rear end, shrinkage pool internal perisporium is the conical surface the same with elastic clamping cover periphery wall tapering, press from both sides tight end external screw.

The rear end of the body is fixed on a tailstock of a machine tool, the rear end of the shaft workpiece is inserted into the elastic jacket, and meanwhile, the tailstock applies jacking force to the shaft workpiece. Because the elastic jacket is arranged in the concave hole of the body in a sliding manner, and the rear end of the elastic jacket is closed, the surface of the inner side of the elastic jacket corresponding to the rear end of the elastic jacket abuts against the shaft workpiece after the rear end of the shaft workpiece is inserted into the elastic jacket, so that the elastic jacket keeps static, and the body can slide forwards relative to the elastic jacket. The outer peripheral wall of the elastic jacket is a conical surface of which the outer diameter is gradually reduced from the front end to the rear end of the body, and the inner peripheral wall of the concave hole is a conical surface with the same taper as the outer peripheral wall of the elastic jacket, so that acting force is applied to the outer peripheral wall of the elastic jacket from the inner peripheral wall of the concave hole in the process that the body slides forwards relative to the elastic jacket, and each petal-shaped structure at the front end of the elastic jacket contracts inwards and is clamped on the outer peripheral surface at the rear end of the shaft workpiece.

The elastic jacket is arranged in the outer clamping center body, the elastic jacket is retracted when the shaft workpiece is tightly pressed, the outer peripheral face of the shaft workpiece is clamped tightly, the contact area of the shaft workpiece and the whole outer clamping center is increased, the slipping phenomenon when the shaft workpiece without a center hole is tightly pressed by the center is particularly reduced, the centering of the shaft workpiece is more accurate, and the machining precision of the shaft workpiece is improved.

In the outer clamping center, the inner hole of the elastic clamping sleeve is a straight hole, and an opening of the inner hole of the elastic clamping sleeve is provided with an outward-expanding guide section.

The inner hole of the elastic jacket is a straight hole, the shaft workpiece is inserted into the elastic jacket to form clearance fit, and when the elastic jacket is extruded and shrinks inwards, the hole wall of the inner hole of the elastic jacket is firmly attached to the outer peripheral surface of the shaft workpiece, so that the contact area of the inner hole and the outer peripheral surface is maximized.

In the outer clamping center, the locking nut comprises a ring-shaped cap body and an annular retaining shoulder fixedly connected to the inner circumferential wall of the front end of the cap body, the aperture of a central hole of the annular retaining shoulder is located between the maximum aperture of the concave hole and the aperture of an inner hole of the elastic clamping sleeve, and when the elastic clamping sleeve moves outwards towards the concave hole, the front end face of the elastic clamping sleeve can abut against the annular retaining shoulder.

After the outer wall of the shaft workpiece is machined, the tailstock drives the body to move backwards, relative sliding occurs between the body and the elastic clamping sleeve, the front end face of the elastic clamping sleeve abuts against the annular retaining shoulder, and therefore the elastic clamping sleeve does not contract inwards under stress. The elastic jacket is separated from the shaft workpiece, so that the whole outer clamping center is smoothly separated from the shaft workpiece.

In the outer clamping center, a plurality of connecting grooves are formed between the outer peripheral wall and the front end face of the cap body, and the connecting grooves are uniformly distributed in the circumferential direction.

In foretell outer clamp top, the body include the cylinder and link firmly in the cylinder front end and the cooperation head that the external diameter is greater than the cylinder external diameter, the shrinkage pool is located on the cooperation head.

The tip portion of conventional top is sharp and the external diameter is also less, and the body that will this outer clamp tip sets up to include the cylinder and link firmly in the cylinder front end and the cooperation head of external diameter increase for this reason, and the existence of cooperation head makes this outer clamp tip can improve the area of contact with axle type work piece through setting up elastic jacket.

Compared with the prior art, the outer clamping center has the advantages that the elastic clamping sleeve is arranged in the body, the elastic clamping sleeve is retracted when the shaft workpiece is tightly jacked, so that the outer peripheral surface of the shaft workpiece is clamped, the contact area between the shaft workpiece and the whole outer clamping center is increased, the slipping phenomenon when the shaft workpiece with a center hole not arranged on the end surface is tightly jacked by the center is particularly reduced, the centering of the shaft workpiece is more accurate, and the machining precision of the shaft workpiece is improved.

Drawings

Fig. 1 is a cross-sectional view of the present outer clamping tip.

In the figure, 1, a body; 1a, a column body; 1b, a matching head; 1b1, a concave hole; 2. an elastic jacket; 2a, a groove; 3. a lock nut; 3a, a cap body; 3a1, coupling groove; 3b, an annular retaining shoulder.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, the outer clamping center comprises a body 1, the front end of the body 1 is a clamping end, a concave hole 1b1 is arranged on the end surface of the clamping end, and an elastic clamping sleeve 2 is arranged in the concave hole 1b1 in a sliding manner along the axial direction of the body 1. Specifically, the body 1 includes a column 1a and a fitting head 1b fixedly connected to the front end of the column 1a and having an outer diameter larger than that of the column 1a, and the concave hole 1b1 is formed in the fitting head 1 b.

The front end of the elastic jacket 2 is open and the rear end is closed, and a plurality of grooves 2a which enable the front end of the elastic jacket 2 to form a plurality of petal-shaped structures penetrate through the side part of the elastic jacket 2. The outer peripheral wall of the elastic jacket 2 is a conical surface of which the outer diameter is gradually reduced from the front end to the rear end, the inner peripheral wall of the concave hole 1b1 is a conical surface with the same taper as the outer peripheral wall of the elastic jacket 2, and the inner peripheral wall of the concave hole is attached to the outer peripheral wall of the elastic jacket 2. The inner hole of the elastic jacket 2 is a straight hole, and an outer expanding guide section is arranged at the hole opening of the inner hole of the elastic jacket 2. The elastic jacket 2 can be made of metal or plastic.

The matching head 1b is in threaded connection with a locking nut 3, the locking nut 3 comprises a circular-ring-shaped cap body 3a and an annular retaining shoulder 3b fixedly connected to the inner circumferential wall of the front end of the cap body 3a, the aperture of a central hole of the annular retaining shoulder 3b is located between the maximum aperture of the concave hole 1b1 and the aperture of an inner hole of the elastic jacket 2, and when the elastic jacket 2 moves outwards towards the concave hole 1b1, the front end face of the elastic jacket 2 can abut against the annular retaining shoulder 3 b. A plurality of connecting grooves 3a1 are arranged between the outer peripheral wall and the front end surface of the cap body 3a, and the connecting grooves 3a1 are evenly distributed in the circumferential direction.

The rear end of the body 1 is fixed on a tailstock of a machine tool, the rear end of the shaft workpiece is inserted into the elastic jacket 2, and meanwhile, the tailstock applies a jacking force to the shaft workpiece. Because the elastic jacket 2 is slidably disposed in the concave hole 1b1 of the body 1 and the rear end of the elastic jacket 2 is closed, after the rear end of the shaft workpiece is inserted into the elastic jacket 2, the inner side of the elastic jacket 2 corresponding to the rear end of the elastic jacket 2 abuts against the shaft workpiece, so that the elastic jacket 2 remains stationary, and thus the body 1 slides forward relative to the elastic jacket 2. The outer peripheral wall of the elastic jacket 2 is a conical surface with the outer diameter gradually decreasing from the front end to the rear end of the body 1, and the inner peripheral wall of the concave hole 1b1 is a conical surface with the same taper as the outer peripheral wall of the elastic jacket 2, so that in the process that the body 1 slides forwards relative to the elastic jacket 2, acting force is applied to the outer peripheral wall of the elastic jacket 2 from the inner peripheral wall of the concave hole 1b1, and each petal-shaped structure at the front end of the elastic jacket 2 contracts inwards and is clamped on the outer peripheral surface at the rear end of the shaft workpiece.

This outer clamping point is through setting up elastic jacket 2 in body 1, utilizes elastic jacket 2 internal contraction when pushing up axle type work piece and press from both sides tightly on the outer peripheral face of axle type work piece, has increased axle type work piece and whole outer clamping point's area of contact, has especially reduced the phenomenon of skidding when utilizing the axle type work piece that top tight terminal surface was not provided with the centre bore for the centering of axle type work piece is more prepared, thereby has improved the machining precision of axle type work piece.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. Outer press from both sides top, including body (1), body (1) front end be the clamping end, a serial communication port, the clamping end terminal surface be equipped with shrinkage pool (1b1), it is provided with elasticity clamp cover (2) to follow body (1) endwise slip in shrinkage pool (1b1), elasticity clamp cover (2) front end opening and rear end are sealed, elasticity clamp cover (2) lateral part runs through and is provided with a plurality of type grooves (2a) that make elasticity clamp cover (2) front end form a plurality of lamella column structures, elasticity clamp cover (2) periphery wall is the conical surface that the external diameter reduces gradually from the front end to the rear end, shrinkage pool (1b1) internal perisporium is the conical surface the same with elasticity clamp cover (2) periphery wall tapering, clamping end external screw thread connection has lock nut (3) that can prevent elasticity clamp cover (2) from deviating from in shrinkage pool (1b 1).

2. The outer clamping point according to claim 1, wherein the inner hole of the elastic clamping sleeve (2) is a straight hole, and an opening of the inner hole of the elastic clamping sleeve (2) is provided with an outward-expanding guide section.

3. The outer clamping point according to claim 2, wherein the inner side wall of the guide section is provided with a plurality of ribs (2b) along the circumferential direction.

4. The outer clamping center according to claim 3, wherein the lock nut (3) comprises a circular cap body (3a) and an annular retaining shoulder (3b) fixedly connected to the inner peripheral wall of the front end of the cap body (3a), the aperture of the central hole of the annular retaining shoulder (3b) is located between the maximum aperture of the concave hole (1b1) and the aperture of the inner hole of the elastic clamping sleeve (2), and the front end face of the elastic clamping sleeve (2) can abut against the annular retaining shoulder (3b) when the elastic clamping sleeve (2) moves outwards from the concave hole (1b 1).

5. The collet center according to claim 4, wherein a plurality of coupling grooves (3a1) are formed between the outer peripheral wall and the front end surface of the cap body (3a), and the coupling grooves (3a1) are uniformly distributed in the circumferential direction.

6. The outer clamping point as claimed in claim 1, 2, 3, 4 or 5, wherein the body (1) comprises a column body (1a) and a matching head (1b) which is fixedly connected to the front end of the column body (1a) and has an outer diameter larger than that of the column body (1a), and the concave hole (1b1) is formed in the matching head (1 b).