CN104482892B - Spatial special casts the datum tool method of nacelle - Google Patents

Abstract

The invention discloses a datum transfer method for a space special-shaped casting cabin, which comprises the following steps: the first step: determining the non-processed surface of a single casting cabin, setting a horizontal datum and a symmetrical datum, and performing the process between casting and mechanical processing Reference transfer; second step: reserve a process boss on the non-machined surface of a single casting cabin, and process horizontal and symmetrical processing planes on the craft boss; third step: after the casting cabin is welded as a whole, Re-process the horizontal and symmetrical processing planes on the process boss as the reference transfer between welding and subsequent processes; the fourth step: after all the processes are processed, remove the process boss, and place it on the outer surface of the cabin Mark the horizontal and symmetric orientation fiducial marks. The invention transfers the datum of the special-shaped cabin body to the plane datum through the datum conversion, thereby improving the alignment efficiency and precision in the manufacturing process.

Description

Datum Transfer Method for Spatial Shaped Casting Cabin

technical field

The invention belongs to the technical field of processing and manufacturing, and relates to a reference transfer method for a space special-shaped casting cabin.

Background technique

With the continuous development of the aerospace industry, higher requirements are put forward for the performance of aircraft and spacecraft. As far as the manufacture of modern spacecraft is concerned, it is characterized by light weight and high structural strength. Reducing the weight of its own structure means improving the maneuverability of the aircraft, increasing the ability to carry loads and flying farther. Therefore, in structural design, more large-scale and complex lightweight structures are used, but for manufacturing Technology has brought huge challenges, among which the thin-walled deformation will cause errors in the conformity of the structure, as well as the reference transmission error in the multi-process flow.

Many studies at home and abroad focus on the force simulation in the machining process, but there are few studies on the datum transfer in each process of the actual machining of large and complex thin-walled cabins.

Contents of the invention

The technical solution of the present invention is to overcome the difficulty of benchmark transmission in the manufacturing process of special-shaped casting cabins, and propose a method for benchmark transmission of space special-shaped casting cabins. The method realizes the datum transmission in the manufacturing process of the special-shaped casting cabin body, and solves the shortcoming that the alignment of the special-shaped datum is difficult in the manufacturing process.

Technical scheme of the present invention:

A reference transfer method for a space special-shaped casting cabin, comprising the following steps:

Step 1: Determine the non-machined surface of a single casting cabin, set the horizontal datum and symmetrical datum, and transfer the datum between casting and machining;

Step 2: Reserve a process boss on the non-processing surface of a single casting cabin, and process horizontal and symmetrical processing planes on the process boss. This processing plane is used as the benchmark for casting cabin assembly and welding. Datum transfer between assembly and welding;

Step 3: After the overall welding of the casting cabin is completed, re-process the horizontal and symmetrical processing planes on the process boss, as a reference transfer between welding and subsequent processes;

Step 4: After all the processes are finished, the process boss is removed, and the horizontal direction and symmetric direction reference marks are marked on the outer surface of the cabin.

The method for setting the horizontal datum and the symmetrical datum is as follows:

The symmetry plane line is determined by the centers of the two internal ribs at the upper and lower ends of the casting cabin, the axial horizontal plane line is determined by the front end face, and the other side end face is used to check, and the horizontal datum line and the symmetry plane line are drawn around the part circumference as Benchmark for processing large surfaces at both ends. After the horizontal datum line and the symmetrical plane line are obtained, the horizontal datum and the symmetrical datum are obtained.

Beneficial effects of the present invention:

Through datum conversion, the datum of the special-shaped cabin is transferred to the plane datum, and the plane is used as the transfer datum, which improves the alignment efficiency and accuracy in the manufacturing process.

Description of drawings

Fig. 1 is the front view of the schematic diagram of process boss setting;

Fig. 2 is a cross-sectional view of a schematic diagram of the process boss setting (the cross-sectional position is the cross-sectional position of the boss 1 shown in Fig. 1);

Fig. 3 is a side view of a schematic diagram of the process boss arrangement.

Note: Dimension A represents the distance from the horizontal reference line to the horizontal processing surface of the process boss, and dimension B represents the distance from the symmetry plane line to the side processing surface of the process boss

Detailed ways

Working principle: The present invention is a reference transfer method for space special-shaped casting cabins. Through reference conversion, the reference of special-shaped cabins is transferred to the plane reference, and the plane is used as the transfer reference to solve the transfer of special-shaped cabin references in the process of processing and manufacturing. difficult question.

The technical scheme of the datum transfer method of the present invention is: set the alignment datum at the horizontal and symmetrical positions (vertical and horizontal directions) at the two ends of the inner cavity of the single-section casting, as a unified datum for marking during casting, heat treatment and machining , determine the symmetrical plane line at the center of the two inner ribs at the upper and lower ends, determine the axial position on the front end face, that is, the horizontal plane line, check with the other side end face, draw the horizontal plane line and the symmetrical plane line around the part, As a benchmark for processing the large surfaces at both ends, extend the line drawn in the inner cavity to the outer surface and to the boss at the same time, and mark the position of the line on the process boss 1. At this time, the process boss 1 has an initial rough machining datum function. Two process bosses 1 are cast on both sides of each section. The process reference of the inner cavity will be transmitted to the process boss during processing, and it will be used as a benchmark for subsequent welding, inspection and overall processing. The schematic diagram of the process boss 1 is shown in the figure 1, 2 and 3 are shown. Dimension A in the figure represents the distance from the horizontal plane line to the horizontal processing surface of the process boss, and dimension B represents the distance from the symmetrical plane line to the side processing surface of the process boss. During component and overall processing, the horizontal and vertical positions of each process boss 1 are coordinated, and the difference is relatively complemented. According to the difference in position coordination, the processing reference is corrected (according to the cabin processing conditions, the median value of the difference is generally selected as a correction). During the single-stage processing, ensure that the processing coordinate system of the butt joint and the docking plane is consistent with the processing coordinate system of the process boss 1. Similarly, after the assembly welding is completed, retest the deformation of each group of weldments. According to the deformation, Appropriate micro-adjustment of process benchmarks, so that the symmetry plane and horizontal reference line of each single-section cabin on the assembly weldment coincide, and the size of the process boss 1 of each group of welding sections is re-corrected as a follow-up reference. After the overall processing is completed, the process boss 1 is removed, and a horizontal symmetrical mark is made by scribing or marking.

specific example

The part to be processed in the test is a space special-shaped casting cabin, which is connected by five segments. Boss 1 and its two end surfaces, butt joint, etc., three-four-five-section group welding, post-weld processing of boss 1, two end surfaces, butt joint, etc. Then the two sets of components are welded and processed as a whole after welding.

The main benchmark transfer design process is as follows:

Set the alignment datum at the horizontal and symmetrical positions at both ends of the single-section casting inner cavity, and leave an alignment plane on the end face and horizontal and vertical ribs as a unified datum for casting, heat treatment, and marking during machining. Two process bosses 1 are cast on both sides of each section. The process reference of the inner cavity will be transferred to the process bosses during processing. The horizontal and symmetrical processing planes on the process bosses 1 can be used for subsequent welding and inspection. And the benchmark of the overall processing, the schematic diagram of the process boss setting is shown in Figure 1. During component and overall processing, the horizontal and vertical (symmetrical) positions of each boss 1 are coordinated, and the difference is relatively complemented, which is constantly corrected during processing.

The invention proposes a new method of datum transfer for space special-shaped casting cabin, which improves the difficulty of datum transfer in the process of manufacturing the space special-shape casting cabin, improves the accuracy of datum transfer, and reduces the time for datum alignment. The application of this intellectual achievement in actual production will produce great economic benefits and has a strong application prospect.

Claims (1)

1. a kind of datum tool method of spatial special casting nacelle, which is characterized in that including steps are as follows：

The first step：The non-processing surface for determining individually casting nacelle, sets horizontal reference and symmetric reference, adds in casting and machinery Datum tool is carried out between work；Set the method for horizontal reference and symmetric reference as：To cast in each two of nacelle upper and lower ends Muscle center determines symmetrical plane line, determines axial horizontal plane line with front end face, is checked with another side end face, in part border Horizontal datum and symmetrical plane line are marked, as the benchmark in the processing big face in both ends, horizontal datum and symmetrical plane line obtain Horizontal reference and symmetric reference are just obtained afterwards；

Second step：Reserve false boss on individually casting nacelle non-processing surface, on false boss level of processing direction and The processing plane of symmetry direction, benchmark of the processing plane as the assembly of casting nacelle, welding, in mechanical processing and is assembled, weldering Datum tool is carried out between connecing；

Third walks：After the completion of casting nacelle integral solder, level of processing direction and symmetry direction on false boss again Plane is processed, as the datum tool between welding and subsequent handling；

4th step：All process steps after processing is completed, remove false boss, horizontal direction and symmetrical marked on nacelle outer surface Directional reference marks.