CN210704047U

CN210704047U - Grinding auxiliary device

Info

Publication number: CN210704047U
Application number: CN201921314632.XU
Authority: CN
Inventors: 李敏; 姜燕
Original assignee: Xian Flight Automatic Control Research Institute of AVIC
Current assignee: Xian Flight Automatic Control Research Institute of AVIC
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-06-09
Anticipated expiration: 2029-08-13

Abstract

The utility model provides an auxiliary device for grinding the excircle of a rotary part with a ball at one end, which is characterized by comprising a tail center 1 and a center extension part 2, wherein the end surface of one end of the tail center 1 is provided with a mounting hole 4 along the axis direction; the center extension piece 2 comprises an installation part 20 and an extension part 21, the installation part 20 is arranged in the installation hole 4 in a penetrating mode, and a center hole 9 is formed in the end face, far away from one end of the installation part 20, of the extension part 21 in the axial direction. The device solves the problem that the small-size rotary part with a spherical body at one end cannot be clamped in the machining process.

Description

Grinding auxiliary device

Technical Field

The utility model belongs to the machine-building field, concretely relates to be used for one end to take auxiliary device of spheroidal minor diameter gyration type part excircle grinding.

Background

A small-diameter rotary part with a spherical structure at one end is one of common structures of mechanical parts and components, and is mainly used for key parts of a deflection plate servo valve and a jet gear servo valve. The precision grinding of the rotary excircle is needed in the processing process of the product, and the cylindricity of the excircle is guaranteed to be within 0.01.

At present, the following problems mainly exist in the processing of the diameter excircle of a small-diameter (the diameter is less than or equal to 1mm) rotary part with a spherical structure at one end: turning small-diameter (the diameter is less than or equal to 1mm) rotary parts, so that the length-diameter ratio is large, the resistance of a turning tool is large, and the parts are easy to deform or break; the grinding processing is adopted, the conventional reverse center is used for clamping, the ball body is small in size, the clamping precision is low, the grinding precision is out of tolerance, and meanwhile, the surface of the ball body is easy to wear and damage due to the fact that the center is made of hard material and the surface of the ball body is damaged by jacking.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a be used for one end to take spheroidal gyration type part cylindrical grinding auxiliary device can be used for one end to take spheroidal gyration type part cylindrical grinding, has solved the unable clamping of the small-size gyration type part machining process of one end area spheroid, is difficult to the problem of assurance precision, realizes the precision abrasive machining of gyration excircle part on the part.

The technical scheme of the utility model is that the grinding auxiliary device is used for grinding the excircle of a rotary part with a ball at one end, and comprises a tail center 1 and a center extension part 2, wherein the end surface of one end of the tail center 1 is provided with a mounting hole 4 along the axis direction; the centre extension piece 2 comprises a mounting part 20 and an extension part 21, the mounting part 20 is arranged in the mounting hole 4 in a penetrating mode, and a centre hole 9 is formed in the end face, far away from one end of the mounting part 20, of the extension part 21 in the axial direction.

Further, the inner side end surface of the apex hole 9 is a hemispherical surface.

Furthermore, the diameter of the part sphere is D, and the diameter of the hemispherical surface of the apex hole 9 is 1.3-1.6 times of the diameter D of the part sphere.

Further, the mounting portion 20 and the extension portion 21 are of an integral structure, and the cross-sectional area of the mounting portion 20 in the direction perpendicular to the axis is smaller than that of the extension portion 21 in the direction perpendicular to the axis;

the end of the elongated portion 21 near the apex hole 9 is tapered in the axial direction.

Further, the gap distance between the outer surface of the mounting portion 20 and the inner surface of the mounting hole 4 is in the range of 0.005 to 0.01 mm.

Furthermore, the tip extension piece 2 is provided with a ring groove 7, and the ring groove 7 is located at one end of the mounting portion 20 and is located at a contact position of the end face of one end of the tail tip 1 and the tip extension piece 2.

Further, the tip extension 2 is a brass material.

The technical effects of the utility model: aiming at the external grinding processing of the small-size rotary part with a sphere at one end, a set of grinding machine tip auxiliary device is optimally designed to clamp the small-size rotary part, so that the problem that the precision is difficult to guarantee because the small-size rotary part with the sphere at one end cannot be clamped in the processing process is solved, the external cylindricity of the processed external circle is guaranteed to be within 0.01, and the precise grinding processing of the rotary external circle part on the part is realized. The auxiliary device is simple in structure and high in practicability, and avoids damage to part clamping.

Drawings

FIG. 1 is a schematic view of the machined parts of the present invention;

fig. 2 is a schematic structural view of the tail center of the present invention;

FIG. 3 is a schematic structural view of the auxiliary device of the present invention;

description of reference numerals: 1-tail center, 2-center extension piece, 4-mounting hole, 9-center hole, 20-mounting part, 21-extension part, 8-positioning surface and 5-positioning surface.

Detailed Description

The present invention will be described with reference to the accompanying drawings.

Fig. 1 is a schematic view of the machined parts of the present invention. As shown in fig. 1, one end of the small-sized rotating part is provided with a ball.

Example 1

The utility model provides a be used for spheroidal gyration type part excircle grinding auxiliary device of one end area, connect long piece 2 including tail top 1 and top. Fig. 2 is the tip structure schematic diagram of the utility model, as shown in fig. 2, mounting hole 4 has been seted up along the axis direction to tip 1 one end terminal surface of tail. Fig. 3 is the utility model discloses an auxiliary device structure schematic diagram, as shown in fig. 3, top extension 2 includes installation department 20 and extension portion 21, installation department 20 wears to establish in mounting hole 4, extension portion 21 keeps away from apex hole 9 has been seted up along the axis direction to the terminal surface of installation department 20 one end.

The utility model discloses an auxiliary device has solved the unable clamping of small-size gyration type parts machining process of one end area spheroid, is difficult to the problem of assurance precision.

Furthermore, the inner side end surface of the center hole 9 of the utility model is a hemispherical surface.

Further, the spheroidal diameter of part is D, the utility model discloses a diameter of apex hole 9 hemisphere face is 1.3 ~ 1.6 times of part spheroid diameter D.

Furthermore, the mounting portion 20 and the extension portion 21 of the present invention are integrated, and the cross-sectional area of the mounting portion 20 perpendicular to the axial direction is smaller than the cross-sectional area of the extension portion 21 perpendicular to the axial direction; the end of the elongated portion 21 near the apex hole 9 is tapered in the axial direction.

Further, the utility model discloses a clearance distance's between the surface of installation department 20 and the internal surface of mounting hole 4 scope is 0.005 ~ 0.01 mm.

Further, the utility model discloses a top is provided with annular 7 on lengthening piece 2, and annular 7 is located installation department 20 one end, and is located the top 1 one end terminal surface of tail and the top position of lengthening 2 contacts.

Further, the top extension piece 2 of the utility model is made of brass.

Specifically, when the workpiece is ground in an excircle mode, the auxiliary device comprises the following use steps:

the tail center 1 is of a cone structure, a mounting hole 4 is formed in the end face of one end of the tail center 1 along the axis direction, and the end face of the mounting hole 4 is a positioning face 5. The tail center 1 comprises a clamping part which is arranged on one side far away from the mounting hole 4, the clamping part is mounted with equipment, the mounting hole 4 is fixedly connected with the mounting part 20 of the center extension piece 2 through glue, and the gap is 0.005-0.01 mm.

The end surface of the lengthening part 21 of the center lengthening part 2 close to the mounting part 20 is a positioning surface 8, and the positioning surface 5 of the mounting hole 4 is tightly attached to the positioning surface 8 of the center lengthening part 2.

The center extension piece 2 is of a step cylinder structure and comprises an installation part 20, a ring groove 7, a positioning surface 8 and a center hole 9. The center hole 9 is used for auxiliary support of the spherical structure in the process of cylindrical grinding of a small-size rotary part with the spherical structure at one end to be processed, and the diameter of the orifice is 1.3 to 1.6 times of that of the spherical structure of the part.

Claims

1. A grinding auxiliary device is used for cylindrical grinding of a rotary part with a ball at one end and is characterized by comprising a tail center (1) and a center extension piece (2), wherein a mounting hole (4) is formed in the end face of one end of the tail center (1) along the axis direction; the center extension piece (2) comprises an installation part (20) and an extension part (21), the installation part (20) penetrates through the installation hole (4), and the extension part (21) is far away from the end face of one end of the installation part (20) and is provided with a center hole (9) along the axis direction.

2. Auxiliary device according to claim 1, characterized in that the inside end surface of the apex hole (9) is hemispherical.

3. Auxiliary device according to claim 2, characterized in that the part sphere has a diameter D, and the diameter of the hemispherical surface of the apex hole (9) is 1.3 to 1.6 times the diameter D of the part sphere.

4. The auxiliary device according to claim 1, wherein the mounting portion (20) and the elongated portion (21) are of a unitary structure, and the cross-sectional area of the mounting portion (20) in the direction perpendicular to the axis is smaller than the cross-sectional area of the elongated portion (21) in the direction perpendicular to the axis;

one end of the lengthening part (21) close to the center hole (9) is conical along the axis direction.

5. The auxiliary device according to claim 4, wherein a gap distance between an outer surface of the mounting portion (20) and an inner surface of the mounting hole (4) is in a range of 0.005 to 0.01 mm.

6. The auxiliary device according to claim 5, characterized in that the centre extension (2) is provided with an annular groove (7), and the annular groove (7) is located at one end of the mounting portion (20) and at a position where the end face of one end of the tail centre (1) contacts with the centre extension (2).

7. The auxiliary device according to claim 1, characterized in that the elongated member (2) is of brass material.