CN112192159A

CN112192159A - Hollow frame part machining method

Info

Publication number: CN112192159A
Application number: CN202011085292.5A
Authority: CN
Inventors: 刘小玲
Original assignee: Guizhou Aerospace Electronic Technology Co Ltd
Current assignee: Guizhou Aerospace Electronic Technology Co Ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-01-08
Anticipated expiration: 2040-10-12
Also published as: CN112192159B

Abstract

The invention provides a method for processing a hollow frame part; firstly, ribs are machined in a hollow frame of a part, then the part is cut, and the ribs are cut off after the cutting machining is finished. The invention can efficiently finish the part processing of the hollow frame part with high quality, has high product surface quality, stable and reliable dimensional precision, good product consistency, reasonable and compact process flow, high production efficiency, convenient clamping, convenient operation and low labor intensity, and saves material cost and processing cost.

Description

Hollow frame part machining method

Technical Field

The invention relates to a method for processing a hollow frame part.

Background

The hollow frame type part has the advantages of complex shape, thin wall, light weight, material saving, compact structure and the like, and is widely applied to the fields of aviation, aerospace and the like. The hollow frame part shown in fig. 1 is in the shape of a flat ring with a maximum outer dimension of 400 mm. The main body is a hollow flat annular cylinder, the wall is thin, the wall thickness is 5mm, the middle position of the side surface of the main body extends outwards to form a flange which is consistent with the shape of the main body, bosses are evenly arranged on the periphery of the main body, mounting holes are arranged on the bosses, the side surfaces of the bosses are aligned with the side surfaces of the main body, and the flange is embedded into the middle position of the bosses. The part has poor rigidity during processing, inconvenient clamping, easy variability, difficult guarantee of size and position precision and poor product consistency. Currently, two main ways are adopted for processing the parts: (1) numerically controlling and milling a hollow inner cavity, an outline and a hole site by disassembling and replacing the fixture; (2) and cutting the hollow inner cavity and the outline by linear cutting, and then numerically milling the side surface of the main body, the upper surface and the lower surface of the boss, the upper surface and the lower surface of the flange and hole positions.

The processing method has the main defects and shortcomings: through the processing of the first mode, the material is extravagant serious, and is with high costs, and the cutting allowance is big, and cutting force and cutting heat are big, and the part is out of shape after processing greatly, and surface quality is poor, and size precision is difficult for guaranteeing, and the location clamping is inconvenient moreover. Through the processing of the second mode, the material waste is serious, the cost is high, the linear cutting expense is high, the processing expense is high, and the subsequent positioning and clamping are inconvenient.

Disclosure of Invention

In order to solve the technical problems, the invention provides a hollow frame part machining method which can efficiently finish the part machining of a hollow frame part with high quality, and has the advantages of high product surface quality, stable and reliable dimensional precision and good product consistency.

The invention is realized by the following technical scheme.

The invention provides a method for processing a hollow frame part; firstly, ribs are machined in a hollow frame of a part, then the part is cut, and the ribs are cut off after the cutting machining is finished.

Preferably, the method comprises the following steps:

feeding: casting an aluminum alloy blank, hollowing the middle part of the blank and leaving a rib structure to obtain a blank with the rib structure;

turning: turning the end part of the blank, and cutting the rib into a plurality of lug structures after turning;

milling: compressing the lug structure, and sequentially milling the end part, the contour and the surface of the concave-convex structure of the blank;

cutting: the blank is held in place by a clamp and the lug structure is cut away.

In the step (iv), the lug structure is cut off simultaneously.

The ribs are cross-shaped ribs.

The ribs are uniformly arranged along the perpendicular bisector of the blank.

The thickness of the ribs is less than half of the thickness of the blank.

And in the second step, cutting into lug structures in a milling mode.

The bottom surfaces of the ribs and the bottom surface of the blank are on the same plane.

The invention has the beneficial effects that: the processing method has the advantages that the processing of parts of the hollow frame parts can be efficiently and high-quality completed, the product surface quality is high, the dimensional accuracy is stable and reliable, the product consistency is good, the process flow is reasonable and compact, the production efficiency is high, the clamping is convenient, the operation is convenient, the labor intensity is low, and the material cost and the processing cost are saved.

Drawings

FIG. 1 is a schematic structural view of a target hollow frame part in one embodiment of the present invention;

FIG. 2 is a schematic structural view of the ribbed structure of the hollow frame part of FIG. 1;

fig. 3 is a schematic view of the hollow frame part of fig. 1 cut into a plurality of lug configurations.

In the figure: 1-hollow frame part, 2-cross-shaped rib, 3-rectangular lug.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

The invention provides a method for processing a hollow frame part, which comprises the steps of processing ribs in a hollow frame of the part, then cutting the part, and cutting off the ribs after the cutting is finished.

Specifically, the method comprises the following steps:

In the fourth step, the lug cutting structure is to cut a plurality of lug structures simultaneously.

The ribs are cross-shaped ribs.

The ribs are uniformly arranged along the perpendicular bisector of the blank.

The thickness of the ribs is less than half of the thickness of the blank.

And step two, cutting into a lug structure by adopting a milling mode.

Example 1

By adopting the scheme, the hollow frame part shown in figure 1 is processed. The practical operation mainly comprises the following steps:

1. casting and processing: selecting ZL101-T6 as a casting aluminum alloy, casting the alloy into a flat annular blank as shown in figure 2, wherein the shape of the flat annular blank is the same as that of the part as shown in figure 1, and the size of the blank is 1-2 mm larger than that of one side of the part. The middle part of the blank is hollowed, cross-shaped ribs 2 are uniformly arranged in the hollow inner cavity, the cross-shaped ribs are flush with the bottom surface of the blank, the thickness of the cross-shaped ribs is 1/3-1/2 of the thickness of the blank, and the cross-shaped ribs are parallel and perpendicular to the two flat side surfaces of the blank respectively.

2. Turning: and symmetrically turning two end faces to ensure that the removal margins of the two end faces are consistent, and the thickness size after machining is consistent with the total thickness size of the part.

2.1, end face turning: the fixture is arranged in a lathe spindle three-jaw chuck, a cylindrical ejector rod is arranged on a lathe tailstock, the diameter of the ejector rod cylinder is 50mm, the fixture is disc-shaped, a blind cavity matched with the blank in shape is arranged in the middle of the fixture, and the depth dimension of the blind cavity is smaller than the total thickness dimension of the part. And placing the blank in a blind cavity of the fixture, wherein the end surface which is flush with the cross-shaped rib faces inwards, and the opening end of the blank faces outwards. And (3) moving the tailstock, extending a cylindrical ejector rod on the tailstock into the inner cavity of the blank to enable the ejector rod to prop against the surface of the cross rib of the blank, so that the end face can be turned, and the machining area of the turning tool exceeds the inner side surface of the hollow inner cavity of the blank.

2.2, turning around the other end face of the vehicle: and turning the part around, placing the part in a blind cavity of the fixture, wherein the open end of the blank faces inwards, and the end face which is flush with the cross-shaped rib faces outwards. And moving the tailstock to enable the cylindrical ejector rod to abut against the surface of the cross-shaped rib on the end face of the blank, so that the end face can be turned, wherein the machining area of the turning tool needs to exceed the inner side face of the hollow inner cavity of the blank and can be used for turning the surface of the cross-shaped rib but does not exceed the abutting area of the cylindrical ejector rod, and the length of the surface machining of the cross-shaped rib can reach 25-30 mm. That is, after the end face is machined, only the region on the top of the cylindrical ejector rod is convex, and the rest region is a plane.

3. Milling: the cross-shaped ribs 2 are milled out of the area which is not turned at the turning end face, so that four rectangular lugs 3 which are connected with the inner side of the frame but disconnected with each other are formed, and the process schematic diagram is shown in fig. 3.

4. Numerical control milling: and placing the frame on an aluminum substrate on a workbench of the numerical control milling machine, wherein the end face which is flush with the cross-shaped rib faces downwards, and the opening end faces upwards. And (3) compacting the four lugs in the hollow area of the frame by using a fixture, centering the circle center, straightening the flat surface, and numerically milling the outline of the frame, the surface of the boss and the surface of the flange.

5. Numerical control milling:

and 5.1, placing the frame on an aluminum substrate on a workbench of the numerical control milling machine, wherein the end face which is flush with the cross-shaped rib faces upwards, and the opening end faces downwards. And (3) compacting the four lugs in the hollow area of the frame by using a fixture, centering, straightening a flat surface, milling the outline of the frame, the surface of the boss and the surface of the flange in a numerical control manner, and processing mounting hole positions on the boss.

And 5.2, pressing the boss on the frame by using a fixture, removing the fixture in the hollow area, and simultaneously cutting off four lugs in the inner cavity of the numerical control milling frame.

And finally, removing the flash and the burr by a bench worker.

Thus, the present invention:

1. the aluminum alloy is adopted to cast the blank, so that the machining allowance is reduced, and the machining period and the cost are reduced; the cross-shaped ribs are arranged in the hollow inner cavity of the blank, so that the rigidity of the hollow frame is increased, and convenience is provided for subsequent processing and mounting of the fixture.

2. The two end faces of the frame are machined by turning, so that the production efficiency is high, the machining deformation is small, the flatness and the surface roughness can be effectively controlled, the thickness and the size precision of the frame are high, and the consistency is good.

3. The area of the cross-shaped rib which is not turned when the end face is turned is cut off, so that four rectangular lugs which are connected with the inner side of the frame but disconnected with each other are formed, the bottom face of the frame is always kept on the same plane, the process lugs for subsequently processing and installing the fixture are reserved, and the method is convenient and rapid.

4. The numerical control milling frame contour, the boss surface, the flange surface, the mounting hole positions on the boss and the inner cavity are adopted, the technical lugs are cut off, the processing deformation is small, the part processing quality is stable and reliable, the precision can be effectively guaranteed, the production efficiency is high, the operation is convenient and fast, and the labor intensity is low.

Claims

1. A method for processing a hollow frame part is characterized by comprising the following steps: firstly, ribs are machined in a hollow frame of a part, then the part is cut, and the ribs are cut off after the cutting machining is finished.

2. The hollow frame member processing method as set forth in claim 1, wherein: the method comprises the following steps:

3. The hollow frame member processing method as set forth in claim 2, wherein: in the step (iv), the lug structure is cut off simultaneously.

4. The hollow frame member processing method as set forth in claim 1, wherein: the ribs are cross-shaped ribs.

5. The hollow frame member processing method as set forth in claim 4, wherein: the ribs are uniformly arranged along the perpendicular bisector of the blank.

6. The hollow frame member processing method as set forth in claim 1, wherein: the thickness of the ribs is less than half of the thickness of the blank.

7. The hollow frame member processing method as set forth in claim 2, wherein: and in the second step, cutting into lug structures in a milling mode.

8. The hollow frame member processing method as set forth in claim 1, wherein: the bottom surfaces of the ribs and the bottom surface of the blank are on the same plane.