CN217413626U - Plane grinding fixture with internal spline part - Google Patents

Abstract

The utility model belongs to the technical field of process machining, and relates to a plane grinding fixture with an internal spline part, which comprises a positioning step sleeve (1) and a bolt (2); the positioning step sleeve (1) is a step cylinder, the upper end of the cylinder is provided with a threaded through hole, and the lower end of the cylinder is provided with 3 drainage through holes; the bolt (2) is fixedly arranged on the positioning step base body (1); when the input shaft coupling is assembled, the input shaft coupling is arranged on the step positioning surface of the positioning step sleeve (1), and the bolt (2) is fixed at the top end of any boss of the input shaft coupling. The utility model discloses improve the defect that cylindrical grinder uses emery wheel side (radial force) processing when discontinuous grinding part terminal surface inefficiency, surface accuracy are poor, utilize flat grinder emery wheel axial force to carry out facing (operation) to the part, not only can be used to the different diameter sizes and have the axle type part of boss the location, press from both sides tight and the fine grinding of plane, can also effectively guarantee the depth of parallelism behind the part grinding.

Description

Plane grinding fixture with internal spline part

This application claims priority from a prior application having application number 202122360133.8.

Technical Field

The utility model belongs to the technical field of the technology processing, concretely relates to helicopter input shaft coupling's grinding device.

Background

The input coupling is an important part on a helicopter, and the product belongs to an intermittent grinding product with an internal spline. When the parts are machined, the jumping quantity of the inner spline, the outer end face and the outer shaft diameter of the parts relative to the inner spline is required to be not more than 0.01mm, so that the micro-cone spline shaft 4 is selected when the inner end face A and the outer shaft diameter are ground. As shown in fig. 1, a part 3 is positively loaded into a fixture and clamped by taking an internal spline of the part as a positioning reference, and the part on the fixture is subjected to one-time clamping by using an external grinding machine to process qualified internal end surface and shaft diameter dimensions. However, the jumping amount of the outer end face B relative to the inner spline is not more than 0.01mm, in order to ensure the relative relationship between the relevant sizes of the parts, the outer end face of the part can be reversely ground by using a cylindrical grinder on the micro-cone spline shaft 4, and because the part is subjected to intermittent grinding, the grinding resistance is large, and the holding force of the part 3 and the spline shaft 4 is gradually reduced during the reverse grinding, the part can be ground and moved when the part is ground to the outer end face. So that the jumping amount of the processed outer end surface B relative to the processed inner end surface A, the outer shaft diameter and the spline inner hole is larger than 0.01 mm. The cylindrical grinder is used for grinding the end face of a part by radial force, the grinding stability and the surface grinding roughness of the grinding wheel are not as good as those of the axial force, and the machined part cannot be qualified by 100%. If the part 3 is reversely arranged in the clamp after being retreated, although the technical requirement of the processing quality can be met by aligning the processed surface of the part, the preparation time and the alignment error are increased by secondary clamping and alignment, the production efficiency is reduced, and the processing quality is also reduced.

Disclosure of Invention

The utility model aims at: the plane grinding clamp with the internal spline part is provided to solve the technical problems of insufficient machining precision and poor quality in the existing machining method.

For solving the technical problem, the technical proposal of the utility model is that:

a plane grinding clamp with an internal spline part comprises a positioning step sleeve and a bolt;

the positioning step sleeve is an end surface positioning radial compression structure, three steps are arranged in the positioning step sleeve, a threaded through hole is formed in the side wall of the upper end of the positioning step sleeve, and a drainage through hole is formed in the lower end of the positioning step sleeve;

the upper-section step I is matched with the upper end triangular structure of the input coupler, the middle-section step II is matched with the middle part of the input coupler, and the lower-end step III is matched with the lower-end cylinder of the input coupler;

the bolt is fixedly arranged on the positioning step sleeve;

when the input coupler is assembled, the positioning inner end face A of the input coupler is installed on the step positioning face of the positioning step sleeve, and the bolt is fixed at any vertex angle of the triangular structure of the input coupler. The fixing mode of the positioning step sleeve and the inner end face of the input coupler is that the positioning step sleeve and the inner end face of the input coupler are fixed through nuts.

The fit clearance of the upper stage I is 0.02-0.03 mm; the fit clearance of the lower end step III is 0.05-0.06 mm. The upper stage step I and the lower stage step III are used for positioning, and small clearance fit is adopted to ensure the stability of clamping.

The fit clearance of the middle step II is 0.15-0.20 mm. The middle step II adopts common clearance fit to prevent interference.

The number of the drainage through holes is 3.

Preferably, the material used for the positioning step sleeve is ordinary quenched steel.

Preferably, the outer portion of the positioning step sleeve is cylindrical.

The utility model has the advantages that: adopt the utility model discloses a plane grinding anchor clamps with internal spline part not only can be used to the location of different diameter sizes and the axle type part that has the boss, press from both sides tightly and the finish grinding of plane, can also effectively guarantee the depth of parallelism behind the part grinding. The flatness is not more than 0.005mm, the indirect verticality is not more than 0.01mm, and the surface light precision is higher than that of the cylindrical grinder. And the clamping and aligning time can be saved, the purposes of simplicity, convenience, practicability, time saving, labor saving, great result in half effort and improvement of processing efficiency and precision are achieved.

Drawings

FIG. 1 is a schematic diagram of a prior art grinding fixture;

FIG. 2 is a schematic structural view of the flat grinding jig of the present invention;

FIG. 3 is a top view of the assembly effect of the flat grinding fixture and the parts of the present invention;

the device comprises a positioning step sleeve 1, a bolt 2, an input coupler 3, a spline shaft 4, an A-inner end face and a B-outer end face.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the described embodiments are part of the disclosed embodiments, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.

Features of various aspects of embodiments of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.

The flat grinding jig with the internal spline part of the present invention will be described below with reference to specific embodiments,

as shown in fig. 1, the input coupling 3 with internal splines is structured as follows: the upper section is of a triangular structure, the cross section of the upper section is triangular, the middle part is of a semicircular structure, and the lower end is of a cylindrical structure;

the plane grinding clamp device is schematically shown in fig. 2 and 3, and comprises a positioning step sleeve 1 and a bolt 2; the positioning step sleeve 1 is a step cylinder, the upper end of the cylinder is provided with a threaded through hole, and the lower end of the cylinder is provided with 3 drainage through holes;

the positioning step sleeve 1 is an end surface positioning radial compression structure, the end surface A is positioned, and the bolt 2 is compressed in the radial direction; the concrete structure is as follows: the matching gap between the upper-section step I and the upper-end triangular structure of the input coupler 3 is 0.02mm, the matching gap between the middle-section step II and the middle part of the input coupler 3 is 0.16mm, and the matching gap between the lower-end step III and the lower-end cylinder of the input coupler 3 is 0.05 mm;

when assembling, the positioning inner end surface A of the input coupling 3 is arranged on the step positioning surface of the positioning step sleeve 1, and the bolt 2 is fixed at any vertex angle of the triangular structure of the input coupling

The utility model discloses a device is when using, at first puts into bolt 2 in the screw thread through-hole of location step sleeve upper end, installs input shaft coupling 3 the location terminal surface that finish machining has on the excircle grinding machine on the location step surface of location step sleeve 1 of the device of the invention again, makes two arbitrary archs of part lean on the inward flange of location step sleeve, and the part is waited to grind the upper surface to the part is lightly pressed to the hand, makes bolt 2 aim at the part on the remaining protruding part of tightening the part. The device with the input coupling is arranged on a plane grinding machine, and the upper surface of a part is ground by utilizing the axial force of a grinding wheel of the machine tool. The inner surfaces of the positioning step sleeves used in the invention are uniform, and the assembly verticality and parallelism of the positioning step sleeves are ensured by grinding and finish machining; the limiting inner hole of the positioning step sleeve and the outer shaft diameter of the boss of the part should keep an assembly gap of 0.10 mm; the clamping and positioning inner diameter size of the positioning step sleeve and the outer shaft diameter of the part clamping should keep 0.03mm assembly clearance so as to ensure the part clamping stability. After the first product is processed, the step sleeve can be continuously placed on the machine tool without being taken down, the part is directly taken down and then replaced by other parts for continuous processing, and time and convenience are achieved.

Through the structure, the input coupling positioning, clamping and grinding are conveniently realized, the clamping and aligning link is cancelled when the part is clamped, the parallelism and the planeness of the part after grinding are effectively ensured to be not more than 0.005mm, the technical requirement that the verticality is not more than 0.01mm is indirectly ensured, the surface roughness is higher than that of the cylindrical grinding machine, and the precision can reach below Ra0.3. The quality of the processed parts can reach 100 percent and is qualified. The device can also be suitable for positioning, clamping and plane fine grinding of shaft parts with different diameters and sizes and bosses.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims (6)

1. The utility model provides a face grinding anchor clamps with internal spline part which characterized in that: comprises a positioning step sleeve (1) and a bolt (2);

the positioning step sleeve (1) is of an end surface positioning radial compression structure, three steps are arranged in the positioning step sleeve, a threaded through hole is formed in the side wall of the upper end of the positioning step sleeve, and a drainage through hole is formed in the lower end of the positioning step sleeve; the upper step I is matched with the upper end triangular structure of the input coupler (3), the middle step II is matched with the middle part of the input coupler (3), and the lower step III is matched with the lower end cylinder of the input coupler (3);

the bolt (2) is fixedly arranged on the positioning step sleeve (1);

when the input shaft coupler is assembled, the positioning inner end face A of the input shaft coupler (3) is installed on the step positioning face of the positioning step sleeve (1), and the bolt (2) is fixed at any vertex angle of the triangular structure of the input shaft coupler.

2. The flat grinding jig of claim 1, wherein: the fit clearance of the upper stage I is 0.02-0.03 mm; the fit clearance of the lower end step III is 0.05-0.06 mm.

3. The flat grinding jig of claim 1, wherein: the fit clearance of the middle step II is 0.15-0.20 mm.

4. The flat grinding jig of claim 1, wherein: the number of the drainage through holes is 3.

5. The flat grinding jig of claim 1, wherein: the outer part of the positioning step sleeve (1) is cylindrical.

6. The flat grinding jig of claim 1, wherein: the positioning step sleeve (1) is made of common quenched steel.

Images