CN107225503A - Clamp for grinding inner hole of thin-wall long sleeve - Google Patents

Abstract

The invention discloses a fixture for grinding the inner hole of a thin-walled long sleeve. It includes a clamp body and a compression sleeve. the inner hole, the outer surface of the conical chuck is an outer conical surface, the compression sleeve has an inner conical surface that matches the outer conical surface, the conical chuck is milled into three or four lobes, the compression The tight sleeve is pressed on the conical chuck through the cooperation of the inner and outer conical surfaces, so that the conical chuck of the chuck body shrinks the thin-walled long sleeve workpiece clamped. Clamp the thin-walled long sleeve workpiece on the conical chuck, and use the compression sleeve to press the conical chuck on the thin-walled long sleeve workpiece. Using the fixture of the present invention, the clamping force of the workpiece clamping is contracted and clamped by the conical chuck For the workpiece, the clamping force is the radial clamping force, which can meet the requirements of grinding the inner hole of the thin-walled long-sleeved workpiece, and avoid excessive axial deformation caused by installing the thin-walled long-sleeved workpiece on the mandrel to grind the outer circle The problem.

Description

Fixture for Grinding the Inner Hole of Thin Wall Long Sleeve

technical field

The invention relates to a fixture for grinding the inner hole of a thin-walled long sleeve.

Background technique

The commonly used processing method for thin-walled long sleeves is to grind the inner hole first, and then position the inner hole, install the workpiece on the mandrel and grind the outer circle. However, due to the poor rigidity of some thin-walled long sets, the requirements for dimensional accuracy and shape position accuracy are high, and it is difficult to accurately control the clamping force during actual processing. Once the axial clamping force is too large, the workpiece will definitely be deformed, especially in the axial direction. Deformation affects machining accuracy. To meet the processing requirements, improving the stiffness and rotation accuracy of the grinding machine spindle and mold system is of course a major aspect, but adopting a reasonable clamping method and correct grinding specifications for the workpiece is also an important technical measure that cannot be ignored.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a jig for grinding the inner hole of a thin-walled long sleeve to solve the problem of excessive axial deformation of a thin-walled long sleeve workpiece.

In order to solve the above technical problems, the technical solution of the present invention is: a fixture for grinding the inner hole of a long thin-walled sleeve, which includes a clamp body and a compression sleeve, the clamp body has a conical chuck, and the conical chuck is opened There is an inner hole for clamping a thin-walled long sleeve workpiece. The outer surface of the conical chuck is an outer conical surface. The compression sleeve has an inner conical surface that matches the outer conical surface. The conical chuck is milled into Three or four petals, the compression sleeve is pressed on the conical chuck through the cooperation of the inner and outer conical surfaces, so that the conical chuck of the chuck body shrinks the thin-walled long sleeve workpiece clamped.

Further, the clamp body is made of 65Mn steel material, and the heat treatment hardness of the clamp body is 45HRC.

Further, the taper of the inner and outer conical surfaces of the compression sleeve and the clamp body is 1:10 or 1:16.

After adopting the above technical scheme, the conical collet of the clamping body of the present invention is used to clamp the thin-walled long-sleeved workpiece, clamp the thin-walled long-sleeved workpiece on the conical collet, and use the compression sleeve to press the conical collet on the thin-walled long-sleeved workpiece. Put the workpiece on the long wall, and then clamp the connecting end of the clamp body on the grinding machine for grinding. Using the clamp of the present invention, the clamping force of the workpiece clamping is contracted by the conical chuck to clamp the workpiece, and the clamping force is radial The clamping force can meet the requirements of grinding the inner hole of the thin-walled long-sleeved workpiece, avoiding the problem of excessive axial deformation caused by installing the thin-walled long-sleeved workpiece on the mandrel to grind the outer circle, and avoiding the problem of thin-walled long-sleeved workpieces. The positioning error caused by the gap between the inner hole of the long sleeve workpiece and the mandrel; when the present invention is used, the outer circle of the thin-walled long sleeve workpiece and the inner hole of the conical chuck are clearance fit, and the fit clearance should not be too tight or too loose. ~0.03mm is appropriate. When using, the tightening force of the compression sleeve should not be too large. After clamping, the workpiece cannot be taken out by hand. The processing of the inner hole of the thin-walled long sleeve.

Description of drawings

Fig. 1 is the front sectional view of the clamp of the present invention for grinding the inner hole of thin-walled long sleeve;

In the figure, 1. clamp body, 2. compression sleeve, 3. thin-walled long sleeve workpiece, 4. conical chuck.

detailed description

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figure 1, a fixture for grinding the inner hole of a thin-walled long sleeve, it includes a clamp body 1 and a compression sleeve 2, the clamp body 1 has a conical chuck 4, and the conical chuck 4 is opened for The inner hole of the thin-walled long sleeve workpiece is clamped. The outer surface of the conical chuck 4 is an outer conical surface. The compression sleeve 2 has an inner conical surface that matches the outer conical surface. The conical chuck 4 is milled into three or four petals, and the conical collet 4 of the clamping body essentially acts as a collet, and the compression sleeve 2 is pressed on the conical collet 4 through the cooperation of the inner and outer conical surfaces, so that the The thin-walled long sleeve workpiece 3 clamped by the conical chuck 4 shrinks, thus solving the problem of excessive axial deformation.

Preferably, the clamp body 1 is made of 65Mn steel material, and the heat treatment hardness of the clamp body 1 is 45HRC.

Preferably, as shown in FIG. 1 , the taper of the inner and outer conical surfaces of the compression sleeve 2 and the clamp body 1 is 1:10, or 1:16.

The processing method is: first grind the outer circle of the thin-walled long-sleeved workpiece 3 on a centerless grinding machine to the size matching the inner hole of the conical chuck, then position the outer circle, and clamp the thin-walled long-sleeved workpiece 3 on the conical chuck 4, the compression sleeve 2 is pressed on the conical chuck 4, and then the chuck body 1 is clamped on the grinding machine to grind the inner hole and the end face to meet the specified technical requirements.

The structure of the invention can avoid the problem of excessive axial deformation when the thin-walled long-sleeved workpiece is installed on the mandrel for grinding the outer circle, and also avoids the positioning error caused by the gap between the inner hole of the thin-walled long-sleeved workpiece and the mandrel.

Thin-walled long sleeve workpiece 3 uses a centerless grinder to grind the outer circle, which can not only ensure the consistency of the outer circle size, stable quality, but also improve production efficiency.

The conical collet 4 of the clamping body 1 of the present invention is used to clamp the thin-walled long sleeve workpiece 3, and the thin-walled long sleeve workpiece 3 is clamped on the conical collet 4, and the conical collet 4 is pressed on the thin-walled long sleeve workpiece 4 with the compression sleeve 2 Wall length cover workpiece 3, then clamp the connecting end of the clamp body 1 on the grinding machine for grinding, use the clamp of the present invention, the clamping force of the workpiece clamping is contracted and clamped by the conical chuck 4, and the clamping force It is the radial clamping force, which can avoid the problem of excessive axial deformation caused by installing the thin-walled long-sleeved workpiece 3 on the mandrel to grind the outer circle on the basis of satisfying the grinding of the inner hole of the thin-walled long-sleeved workpiece. The positioning error caused by the gap between the inner hole of the thin-walled long-sleeved workpiece and the mandrel is avoided; when the present invention is used, the outer circle of the thin-walled long-sleeved workpiece and the inner hole of the conical chuck are clearance fit, and the fit gap should not be too tight or too loose , the appropriate gap is 0.02-0.03mm. When in use, the tightening force of the compression sleeve should not be too large. After clamping, the workpiece cannot be taken out by hand; the invention is especially suitable for high-precision, Machining of thin-walled long sleeve inner holes with low surface roughness.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (3)

1. a clamp for grinding thin-walled long sleeve inner hole, it is characterized in that: it comprises clamp body (1) and compression sleeve (2), and described clamp body (1) has conical collet (4), so The conical chuck (4) has an inner hole for clamping a thin-walled long sleeve workpiece, the outer surface of the conical chuck (4) is an outer conical surface, and the compression sleeve (2) has a The inner conical surface matched with the inner conical surface, the conical chuck (4) is milled into three or four lobes, and the compression sleeve (2) is pressed on the conical chuck (4) through the cooperation of the inner and outer conical surfaces, so that the chuck Specifically, the conical chuck (4) of (1) shrinks the thin-walled long sleeve workpiece (3) clamped. 2. The jig for grinding the inner hole of a thin-walled long sleeve according to claim 1, characterized in that: the jig body (1) is made of 65Mn steel material, and the heat treatment hardness of the jig body is 45HRC. 3. The jig for grinding the inner hole of a thin-walled long sleeve according to claim 2, characterized in that: the taper of the inner and outer conical surfaces of the compression sleeve (2) and the clamp body (1) is 1:10 or 1:16.