CN120572355A - Milling fixture for special-shaped shells - Google Patents

Abstract

The application discloses a milling fixture for a special-shaped shell, which comprises a base, a connecting shaft, a front end cover and a rear end cover, wherein the base is arranged on a machine tool workbench, the lower end face of the connecting shaft is connected, the front end cover and the rear end cover are connected and positioned on the upper end face of the connecting shaft, the rear end cover is connected with the upper end face of the connecting shaft through bolts, the front end cover is connected with the rear end cover through bolts, positioning faces and clamping holes are formed in the front end cover and the rear end cover 6, and after the front end cover is connected with the rear end cover, the shapes of the clamping holes and the positioning faces are matched with the shape of a workpiece to be processed. The technical scheme of the application has high positioning precision, convenient clamping and simple operation, can realize the processing and control of the spatial multi-position elements by one-time processing, and improves the processing efficiency of parts.

Description

Milling fixture for special-shaped shell

Technical Field

The invention relates to the technical field of machining, in particular to a milling fixture for a special-shaped shell.

Background

The processing of special-shaped parts is very high to the requirement of clamp, at first, the positioning reference of the parts needs to be determined, the parts are connected with the positioning clamp through the positioning reference, then the parts and the positioning clamp are processed as a whole by utilizing the clamping clamp, and although the special-shaped parts with multiple space sizes, complex appearance structure and unstable references can be solved, the clamp operation is too complex. For example, in the technical scheme disclosed in the method for machining a special-shaped body part, the fixture and the method for designing the fixture, CN202010605179.9, the position of the cushion block is deduced through the position of the mandrel, the cushion block is tightly pressed by the pressing plate, the cushion block needs to be repeatedly adjusted according to the inspection results of the two mandrels, and the support of the fixture is often not firm enough, and the fixture may move and deviate during clamping, so that the machining effect is affected. In five-axis milling, the multi-space elements and the continuous difficulty of the special-shaped parts are all the time.

Disclosure of Invention

The invention solves the technical problem of providing the special-shaped shell milling fixture which is accurate in positioning, reliable in clamping and higher in universality.

The technical scheme adopted by the invention is that the special-shaped shell milling fixture comprises a base, a connecting shaft, a front end cover and a rear end cover, wherein the base is arranged on a machine tool workbench, the lower end face of the connecting shaft is connected, the heights of the connected base and the connecting shaft are larger than the distance between the machine tool workbench and a spindle box, the front end cover and the rear end cover are positioned on the upper end face of the connecting shaft, the rear end cover is connected with the upper end face of the connecting shaft through bolts, the front end cover is connected with the rear end cover through bolts, a positioning face and a clamping hole are formed in the front end cover and the rear end cover, and after the front end cover is connected with the rear end cover, the shapes of the clamping hole and the positioning face are matched with the shape of a workpiece to be processed;

The front end cover and the rear end cover are attached and connected, the front end cover and the rear end cover are integrally processed and formed, then cut into two parts, the size of the clamping hole is consistent with that of the corresponding part of the workpiece to be processed, after cutting, the connecting surface is formed on the front end cover and the rear end cover, and the cutting removal thickness is more than 0.5mm and less than 1mm.

The clamping holes and the positioning faces on the front end cover and the rear end cover are symmetrical.

The clamping holes comprise square holes and round holes, and the square holes and the round holes are matched with the outline dimension of the workpiece.

The connecting surface is provided with a positioning pin hole, and the front end cover and the rear end cover are mutually positioned by utilizing pins.

The connecting shaft is internally provided with a stepped hole.

The invention has the advantages of high repeated positioning precision, convenient clamping and simple operation, can realize the processing and control of the space multi-position elements by one-time processing, improves the processing efficiency of parts and ensures the consistency of quality. The universality can be enhanced by replacing the screw sleeve.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic view of a connecting shaft.

Fig. 3 is a schematic view of a base.

Fig. 4 is a schematic view of the front end cap.

Fig. 5 is a schematic view of the rear end cap.

Fig. 6 is a schematic diagram of an alternative workpiece clamping mode.

The drawing is marked as a 3-connecting shaft, a 31-placing groove, a 4-base, a 5-front end cover, a 6-rear end cover, a 7-positioning surface, a 71-clamping hole, an 8-workpiece, an 81-clamped surface and a 9-connecting surface.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The milling fixture for the special-shaped shell parts comprises a front end cover, a rear end cover, a connecting shaft, a base, pins and bolts. The front end cover 5 and the rear end cover 6 form a clamp body, a clamping hole 71 for clamping and a positioning surface 7 for positioning are formed on the clamp body, a plurality of threaded holes are formed at two ends of the connecting shaft 3, one end of the connecting shaft is connected with the base 4, the connecting shaft 3 is fixed on the base through the matching, and the other end of the connecting shaft is connected with the clamp body for fixing a workpiece to be machined in a matching mode, so that clamping of the workpiece to be machined is completed. The base 4 is provided with a countersunk key slot for integrally fixing the clamp on a workbench of a machine tool. The front end cover and the rear end cover of the fixture body are respectively provided with a positioning pin hole, so that the front end cover 5 and the rear end cover 6 are prevented from moving in series during assembly, and a notch with the depth of about 1mm is formed in the connecting shaft 3 for fixing and repeatedly positioning the fixture body.

Wherein, the front end cover 5 and the rear end cover 6 which form the clamp body are integrally processed and formed and then cut into two parts, the cutting gap is required to be more than 0.5mm and less than 1mm, the size of the clamping hole 71 is consistent with the size of the corresponding part of the workpiece to be processed before cutting, during cutting, symmetrical cutting is carried out along the axis of the clamping hole, and the clamping holes 71 after cutting respectively fall on each half of the rear end cover 6 of the front end cover 5 box. The cutting removal amount is kept at 0.5mm-1mm, that is, after cutting, the sizes of the clamping holes 71 and the corresponding parts of the workpiece are not completely consistent, the diameters of the holes are less than 0.5mm-1mm, when the front end cover 5 and the rear end cover 6 are positioned accurately and clamped, clamping force is generated on the workpiece 8, the workpiece can be fixed by the minimum clamping force due to thin-wall parts in some workpieces, the workpiece is prevented from being deformed due to overlarge clamping force, and the positions of the clamping holes of the front end cover 5 and the rear end cover 6 are positioned and connected and fixed through threaded fit in assembly;

because the work piece processing must carry out the workstation upset, therefore the height after base 4 and connecting axle 3 combination is greater than the distance between lathe workstation and the headstock, can avoid the appearance of collision condition, and connecting axle 3 its inside design is equipped with the shoulder hole to alleviate the whole weight of anchor clamps.

The working principle and the use flow are that when the machine tool is used, the base 4 is fixed with a machine tool workbench, the connecting shaft 3 is connected with the base 4 by using the bolts 1, threaded connecting holes are designed at the bottom of the connecting shaft 3 and are matched with the base 4, the rear end cover 6 is connected with the connecting shaft 3 by using threaded holes, threaded connecting holes are designed at the upper end face of the connecting shaft 3 and are matched with the rear end cover, the clamped surface 81 on a workpiece 8 is clamped and fixed by using the clamping holes 71 on the front end cover 5 and the rear end cover 6, the datum surface and the locating surface 7 of the workpiece 8 are attached, the front end cover 5 and the rear end cover 6 are positioned and connected by using pins and bolts, the workpiece 8 is clamped, and finally the assembly of the clamp and the workpiece 8 to be machined is completed.

The upper end face of the connecting shaft 3 is provided with a placing groove for limiting the position of the front end cover, so that the front end cover is convenient to repeatedly combine and position, the front end cover 5 and the rear end cover 6 are convenient and reliable to install, and the front end cover 5 and the rear end cover 6 are cut after being integrally machined, wherein the cutting is smaller than 1mm and larger than 0.5mm, so that the front end cover and the rear end cover can realize tension, the front end cover cannot tightly hold parts, the reliable clamping force is convenient to provide, the parts are prevented from deforming due to overlarge stress, and the clamping parts of the parts are thin-walled. The clamping holes of the front end cover 5 and the rear end cover 6 can be adjusted according to the outer circle size and the square outline of the workpiece 8 to be machined, so that the universality of the clamp is enhanced, the machining cost is saved, and the working efficiency is improved.

The milling fixture for the special-shaped shell parts has the advantages of convenient clamping, simple operation, repeated positioning and fixing, reliable clamping effect, one-time processing of the machining elements at multiple space positions of the parts, and suitability for milling of various shell parts by changing the sizes of the positioning holes and the square holes of the fixture body. The fixture solves the processing problems of abnormal shell parts such as complex appearance, irregular reference and the like, realizes the one-time processing of the multi-space position elements of the parts, ensures the consistency of the quality of the parts and improves the processing efficiency.

Claims (6)

1. The special-shaped shell milling fixture is characterized by comprising a base (4), a connecting shaft (3), a front end cover (5) and a rear end cover (6), wherein the base (4) is arranged on a machine tool workbench, the lower end faces of the connecting shaft (3) are connected, the heights of the connected base (1) and the connecting shaft (3) are larger than the distance between the machine tool workbench and a spindle box, the front end cover (5) and the rear end cover (6) are positioned on the upper end face of the connecting shaft (3), the rear end cover (6) is connected with the upper end face of the connecting shaft (3) through bolts, the front end cover (5) is connected with the rear end cover (6) through bolts, positioning faces (7) and clamping holes (71) are formed in the front end cover (5) and the rear end cover (6), and after the front end cover (5) is connected with the rear end cover (6), the clamping holes (71) and the shapes of the positioning faces (7) are matched with the shapes of workpieces to be machined.

2. The special-shaped shell milling fixture as claimed in claim 1, wherein the joint surface (9) is formed by the joint surface of the front end cover (5) and the rear end cover (6), the front end cover (5) and the rear end cover (6) are integrally formed and then cut into two parts, the size of the clamping hole (71) is consistent with the size of the corresponding part of the workpiece to be processed, and the joint surface (9) is formed on the front end cover (5) and the rear end cover (6) after cutting, and the cutting removal thickness is more than 0.5mm and less than 1mm.

3. The special-shaped shell milling fixture as claimed in claim 2, wherein the clamping holes (71) and the positioning surfaces (7) on the front end cover (5) and the rear end cover (6) are in a symmetrical state.

4. The special-shaped shell milling fixture as claimed in claim 3, wherein the clamping holes comprise square holes and round holes, and the square holes and the round holes are matched with the external dimensions of the workpiece.

5. The special-shaped shell milling fixture as claimed in claim 2, wherein the connecting surface (9) is provided with positioning pin holes, and the front end cover (5) and the rear end cover (6) are mutually positioned by pins.

6. The special-shaped shell milling fixture according to claim 1, wherein the connecting shaft (3) is internally provided with a stepped hole.