CN219053587U

CN219053587U - Eccentric sphere processing positioner

Info

Publication number: CN219053587U
Application number: CN202223227028.8U
Authority: CN
Inventors: 程静; 王继红; 徐志华; 彭斌; 刘福林
Original assignee: China Helicopter Research and Development Institute
Current assignee: China Helicopter Research and Development Institute
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2023-05-23
Anticipated expiration: 2032-12-01

Abstract

The utility model relates to an eccentric spherical surface turning positioning device, which comprises: a tooling bottom plate and a plurality of positioning pins; the center of the tool bottom plate is provided with a first positioning hole which is matched with the spherical center of the small joint to be processed and is fixed through a positioning pin; the upper surface of the tool bottom plate is also provided with a second positioning hole at a position away from the central hole, and the second positioning hole is matched with the positioning hole on the straight section of the small joint to be processed and is fixed through a positioning pin; and the upper surface of the tool bottom plate is also provided with a yielding cavity along the two sides of the straight line where the two positioning holes are located, and the end face of the convex rib at the bottom of the small joint is propped against the yielding cavity to be fixed. The problems that clamping alignment and positioning are difficult, surface roughness and surface profile accuracy are difficult to reach standards in the process of turning spherical profile surfaces are effectively solved.

Description

Eccentric sphere processing positioner

Technical Field

The utility model relates to a machining technology, in particular to an eccentric spherical surface machining device.

Background

The small joint is a mechanical part with special requirements on the precision and position degree of the spherical surface, and the spherical surface of the part is positioned at an eccentric position and has the specificity when being machined by a numerical control lathe; because the appearance of the part is special, if the back of the part is used for positioning or clamping, the center of the spherical surface to be processed and the surface precision and position requirements of the spherical surface to be processed are difficult to ensure.

1. The spherical center of the small joint deviates from the center position of the part, so that the alignment of the center, the positioning and clamping and the reference alignment of the lathe work are difficult;

2. when the volume and the outline dimension of the part are small and the outline surface of the ball is processed, the part rotates and is easy to vibrate, so that errors such as surface outline precision, surface roughness and the like are generated;

3. for the four-claw clamping mode, the parts are clamped again, the center is aligned and the cushion block is readjusted to clamp the parts every time when one part is processed, so that the clamping time is wasted, the center is aligned again easily to deviate after the clamping is carried out again, and the processing error is increased;

4. the annual batch production demand of small joints is large, and in the mass production process, the traditional positioning and clamping mode wastes time, so that the part delivery rate is reduced.

In conclusion, the eccentric small parts such as the small joints are large in limitation in the traditional four-claw clamping, positioning and clamping processing, the processing difficulty is increased, the problems of over-tolerance in size and the like are easily caused, and the delivery of the parts is affected. By adopting the eccentric spherical surface processing and positioning device, four-claw clamping and alignment are easy, and part clamping and alignment are quick and accurate; and the working table surface is stable, and the precision of the parts is ensured, so that an eccentric spherical surface processing and positioning device is required to be designed.

Disclosure of Invention

The purpose of the utility model is that: the eccentric spherical surface machining and positioning device is provided to solve the problems that clamping alignment and positioning are difficult, and surface roughness and surface profile accuracy are difficult to reach standards in the process of turning spherical profile surfaces.

The technical scheme is as follows: an eccentric spherical turning positioning device, the positioning device comprising: a tooling bottom plate and a plurality of positioning pins; the center of the tool bottom plate is provided with a first positioning hole which is matched with the spherical center of the small joint to be processed and is fixed through a positioning pin; the upper surface of the tool bottom plate is also provided with a second positioning hole at a position away from the central hole, and the second positioning hole is matched with the positioning hole on the straight section of the small joint to be processed and is fixed through a positioning pin; and the upper surface of the tool bottom plate is also provided with a yielding cavity along the two sides of the straight line where the two positioning holes are located, and the end face of the convex rib at the bottom of the small joint is propped against the yielding cavity to be fixed.

Furthermore, the center positioning hole of the tool bottom plate is a center of which the spherical center of the small joint to be processed is concentric with the center of the lathe spindle.

Further, the positioning device further comprises a pressing plate, and the pressing plate is pressed on the straight section of the small joint to be processed.

Further, the tool bottom plate is also provided with a threaded hole, and the threaded hole is matched with a bolt to compress the pressing plate.

Furthermore, a waist-shaped hole is formed in the pressing plate, so that the pressing position of the pressing plate can be conveniently adjusted.

Further, the pressing plate is pressed at one corner of the straight section of the small joint to be processed.

Further, the tool bottom plate is of a disc structure.

The beneficial technical effects are as follows:

1. the utility model utilizes the back structure of the small joint and the hole site characteristics to carry out limit fixation. The convex ribs at the bottom of the small joint are embedded in the fixture bottom plate abdication cavity, and grooves among the convex ribs are propped against the surface of the fixture bottom plate, so that the limiting effect is achieved; the phi 6 locating pin, the phi 6.3 locating pin and the small joint are respectively arranged in two locating holes of the small joint in series for connection and fixation; the center is conveniently and rapidly aligned, and the problem that the eccentric alignment and the positioning are difficult in the spherical surface machining process can be effectively solved.

2. The tool bottom plate is convenient for clamping the three-jaw chuck, so that vibration in the machining process is reduced; the fixture is reliable in structure setting, accurate in positioning, convenient to assemble and disassemble and simple to operate, is particularly suitable for positioning and clamping of large-batch eccentric spherical surface machining such as small joints, reduces the operation difficulty of workers, improves the quality of products and can meet the requirement of batch production;

3. compared with the traditional four-claw clamping mode, the tool bottom plate solves the problem that the center of the eccentric spherical surface of the part is difficult to align. Through the concentric and part structural feature of many centre holes of location, reach frock bottom plate centre bore, location pinhole, little joint sphere centre bore, main shaft center, realize the accurate location of part to guarantee higher dimensional accuracy.

Drawings

FIG. 1 is a schematic view of a positioning device according to the present utility model;

FIG. 2 is a schematic diagram of a tooling bottom plate structure;

FIG. 3 is a top view of a small joint part;

FIG. 4 is a bottom view of the small joint part;

FIG. 5 is a schematic illustration of an embodiment;

wherein, the tool bottom plate 1,

Detailed Description

The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

Fig. 1-2 and 5 illustrate eccentric spherical turning positioning devices, comprising:

1. the tool bottom plate 1 is cylindrical in appearance and is convenient for the three-jaw clamping of a numerical control lathe in appearance size, and one surface of the tool bottom plate facing the small joint 4 is provided with a symmetrical abdication cavity 1a for abdicating the convex rib end surface at the bottom of the small joint against the abdication cavity; the center of the tool bottom plate is provided with a phi 6 pin hole 1b matched with the first positioning pin 2, and the center hole is used for calibrating the center of the tool bottom plate to enable the center of the sphere to be concentric with the center of the lathe spindle and is positioned in the small joint sphere machining center; a phi 6.3 pin hole 1c is arranged at the eccentric 31.5 phi 0.02 position, and an M12 threaded hole 1d is arranged at the distance from the eccentric 55 position, and the second positioning pin 3 and the bolt 6 are respectively matched; the small joint 4 comprises a hemispherical structure and a flat section.

2. The first locating pin 2 is a phi 6 locating pin, the second locating pin 3 is a phi 6.3 locating pin, and locating pins with different diameters are arranged in series at the same horizontal position on the tool bottom plate and clamped in the locating pin holes of the tool bottom plate; the tool is used for positioning different hole sites on the small connector so as to solve the problem of eccentricity of the machining center of the spherical profile surface and make the center of the tool bottom plate concentric with the machining center of the spherical profile surface;

3. the pressing plate 5 and the M12 bolt 6 are used for pressing and fixing the small joint on the bottom metal plate of the tool to prevent vibration in the part machining process; the pressing plate is also provided with a waist-shaped hole, so that the pressing position of the pressing plate can be conveniently adjusted, and the pressing can be realized by using a single hole or the waist-shaped hole to be matched with the pressing plate.

The three-jaw clamping clamps the tool bottom plate clamped with the phi 6 locating pin and the phi 6.3 locating pin on a lathe, and aligns the center (namely the center of the phi 6 locating pin); inserting two through holes with different diameters of the small joint into positioning pins with different diameters on the tool bottom plate, and abutting the end face of the bottom convex rib with the bottom face of the fixture bottom plate abdicating cavity; simultaneously, the pressing plate is lapped on one side plane of the small joint, and the bolt is screwed into an internal threaded hole matched with the tool bottom plate and is screwed up; the spherical surface processing of one part is completed, and the next part can be replaced by loosening the pressing plate and taking down the small joint.

The above detailed description or examples are only for illustrating the technical scheme of the present utility model, and are not limiting, and the detailed description is not to be taken as conventional technical means or common general knowledge in the art; those of ordinary skill in the art will appreciate that: based on the design concept of the present application, the technical solutions described in the foregoing embodiments should be adaptively modified, or some or all of the technical features thereof may be equivalently replaced, where these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An eccentric spherical processing positioning device, characterized in that the positioning device comprises: a tooling bottom plate and a plurality of positioning pins; the center of the tool bottom plate is provided with a first positioning hole which is matched with the spherical center of the small joint to be processed and is fixed through a positioning pin; the upper surface of the tool bottom plate is also provided with a second positioning hole at a position away from the central hole, and the second positioning hole is matched with the positioning hole on the straight section of the small joint to be processed and is fixed through a positioning pin; and the upper surface of the tool bottom plate is also provided with a yielding cavity along the two sides of the straight line where the two positioning holes are located, and the end face of the convex rib at the bottom of the small joint is propped against the yielding cavity to be fixed.

2. The eccentric spherical machining positioning device according to claim 1, wherein the tool bottom plate center positioning hole is a center of which the spherical center of the small joint to be machined is concentric with the center of the lathe spindle.

3. The eccentric spherical machining positioning device of claim 1, further comprising a platen that is pressed against a flat section of the small joint to be machined.

4. An eccentric spherical machining positioning device according to claim 3, wherein the pressing plate is pressed against a corner of the straight section of the small joint to be machined.

5. The eccentric spherical processing and positioning device according to claim 3, wherein the tool bottom plate is further provided with a threaded hole, and the threaded hole is matched with a bolt to compress the pressing plate.

6. The eccentric spherical processing and positioning device according to claim 5, wherein the pressing plate is further provided with a waist-shaped hole for adjusting the pressing position of the pressing plate.

7. The eccentric spherical machining positioning device of claim 1, wherein the tooling bottom plate is of a disc structure.