CN105215155A - A kind of manufacturing process of repeatedly amplifying part - Google Patents

Abstract

The invention belongs to the forming technology of an aircraft rocker arm, and in particular relates to a forming method for multiple extension parts of an aircraft rocker arm. The forming method of the multi-extension part of the present invention uses the drawing die to carry out multiple drawing and hole forming on the developed material, and then closes the drawn drawing hole for many times, and finally obtains the part meeting the size requirement of the product. The forming method of the parts extended by the invention for many times reduces the workload of manual shape correction by avoiding the out-of-tolerance of the caliber, improves the quality, and reduces the scrap rate of parts.

Description

A Forming Method of Multiple Extended Parts

technical field

The invention belongs to the forming technology of an aircraft rocker arm, and in particular relates to a forming method for multiple extension parts of an aircraft rocker arm.

Background technique

The rocker arm part is one of the most important parts of the aircraft control system. It is manufactured with high precision and is an atypical flanged cylindrical part. As shown in Figure 1, the flanges are of different sizes, the diameter of the cylinder is small, and the height is high. The forming of the part can only be completed by stretching and closing, trimming, and turning over. The forming process of this type of parts is complex and highly operable.

The rocker arm part is an atypical flange cylindrical part. Wrinkles will appear after multiple formings. Heat treatment and manual calibration will easily lead to aperture deformation. In particular, when forming the rocker arm in the prior art, it is divided into several consecutive extensions, and then closed after multiple extensions are in place. Wrinkles and cracks are easily generated during the extension process, and the success rate is relatively low, which cannot meet the precision requirements of aircraft rocker products.

Contents of the invention

The purpose of the present invention is to propose a forming method for multiple extension parts that can effectively avoid wrinkles and out-of-tolerance diameters, ensure the processing quality of the rocker arm, and reduce the reject rate.

The technical solution of the present invention is: a forming method for multiple extended parts, the specific process of which is as follows:

Step 1: Cutting

The shearing machine cuts the material and mills out the most ideal expanded material required to form the part by the end milling machine. This expanded material is obtained from multiple tests;

Step 2: Make Positioning Holes

Make positioning holes on the edge of the unfolded material with the experience unfolding template;

Step 3: Stamping Extension

Multiple times of stamping and extension are carried out vertically to the plane of the expanded material, so that the expanded material produces multi-level stepped holes, and the hole diameter is larger than the flange required by the product;

Punch out the bottom surface of the step hole by punching;

Then use the extension die to carry out overall extension, and extend the stepped hole into a straight hole;

Step 4: Stamping Closure

First, the top of the straight hole is gradually pre-closed to the middle end, so that the hole diameter is gradually reduced;

Place a mandrel of the size required by the product in the center of the pre-closed hole, and then squeeze the outer hole wall to make the hole wall fit the mandrel, and the hole diameter meets the product requirements;

Step 5: Shaping the edge of the part

Correct the shape of the residual drawing marks in the drawing process to ensure the surface quality of the parts.

Step 6: Trim and rummage

Cut the parts with the trimming die to get the unfolded material before turning over, and check the height of the product

Bend to flang;

Step 7: Quenching, cooling and closing.

The specific process of multiple stamping extensions in step 3 is as follows: the first extension, the extension height is 23.5mm, the extension diameter is Φ80mm, and then the second extension is performed, the overall height of the extension is 28.5mm, and the extension diameter is Φ60mm; the extension is continued, and the overall height of the extension is 33mm , the extension diameter is Φ40mm, at this time the part is in a ladder shape, and then punched to wash off the bottom surface; then the whole extension is extended through the extension die, the entire diameter is Φ40mm, and the height is 20mm. The whole process must be coated with lubricating oil. Afterwards, complete annealing is required to relieve stress.

After quenching in step 7, use a cylindrical closing die to cover the extension hole of the part to perform overall closing correction.

The advantages of the present invention are: the forming method of the multiple extended parts of the present invention reduces the workload of manual shape correction by avoiding the out-of-tolerance of the caliber, improves the quality, and reduces the scrap rate of the parts.

Description of drawings

Figure 1 is a schematic diagram of a typical structure of an aircraft rocker arm;

Fig. 2 is a flow chart of the forming method of multiple extended parts of the present invention;

Fig. 3 is a schematic diagram of the parts processed by the forming method of the parts extended many times in the present invention.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

The forming method of the multi-extension part of the present invention uses the drawing die to carry out multiple drawing and hole forming on the developed material, and then closes the drawn drawing hole for many times, and finally obtains the part meeting the size requirement of the product.

Please refer to Fig. 2, which provides the implementation process of the forming method of the multiple extended parts of the present invention, and the specific steps are as follows:

1. Cutting

Cutting size 210x100xTH2.5 with shearing machine.

2. Preparation of unfolded material

The experience obtained through many tests is developed, and blanking is carried out with a blanking die.

3. Make positioning holes

Make the Φ6.2 positioning hole with the experiential unfolding template.

4. Stamping extension

For the first extension, the extension height is 23.5, the extension diameter is Φ80, and then the second extension is performed, the overall height of the extension is 28.5, and the extension diameter is Φ60. Continue to extend, the overall height of the extension is 33, and the diameter of the extension is Φ40. At this time, the part is in the shape of a ladder, and then punched to remove the bottom surface. Then the whole is extended through the extension die, the whole diameter is Φ40, and the height is 20. The whole process must be lubricated, and it needs to be fully annealed after each extension to eliminate stress.

5. Stamping closure

The first pre-retraction gradually transitions from the top Φ35 to the low Φ40. For the second closing, use tooling to close the overall size to Φ35.

6. Manual correction

Correct the shape of the residual drawing marks in the drawing process to ensure the surface quality of the parts.

7. Trimming

The part is cut with a cutting die to obtain the unfolded material before turning over.

8. Search through

The flange with a height of 7mm is rummaged.

9. Quenching

10. Use a cylindrical closing die to cover the extension hole of the part to perform overall closing correction.

The hole diameter tolerance requirements are relatively strict. For the deformation of the hole diameter caused by heat treatment, manual shape correction and flanging, considering the springback of parts and the thinning of material thickness, after many tests, it is concluded that the closing die of Φ39 can be used for closing. The tolerance of the hole is strictly guaranteed, and the part is completed satisfactorily. As shown in Figure 3, the hole size of the part is not out of tolerance, which fully meets the product requirements.

Claims (3)

1. repeatedly amplify a manufacturing process for part, it is characterized in that, detailed process is as follows:

Step 1: blanking

Plate shearing machine for blanking also goes out the ideal spread material needed for this part of shaping by the milling of vertical milling lathe, and this spread material is that test of many times draws;

Step 2: locating hole processed

Launch model by experience and make locating hole at the edge of spread material;

Step 3: stamping drawdown

Vertical spread material plane is carried out Multi-step forming and is extended, and make spread material produce multi-stage stairs hole, and aperture is greater than the flange of product requirement;

By punching press punching, wash out the bottom surface of stepped hole;

Recycling mould of extending carries out entirety and extends, and is extended by stepped hole as straight hole;

Step 4: punching press is closed up

First progressively closed up in advance to middle-end in straight hole top, make decreasing pore size;

Placing the plug of product requirement size through pre-center, hole of closing up, then carry out extruding batter to outside hole wall, make hole wall laminating plug, aperture meets product requirement;

Step 5: part edge is corrected shape

Vestige of extending residual in extending is corrected shape, ensures surface quality of workpieces.

Step 6: trimming is turned over time

With edger, part is cut, obtain turning over the spread material all over front, and to product height

Crimp carry out flange;

Step 7: quenching, cooling is closed up.

2. manufacturing process of repeatedly amplifying part according to claim 1, it is characterized in that, Multi-step forming amplification detailed process in step 3 is as follows: first time extends, extend height 23.5mm, extend diameter of phi 80mm, then carry out second time to extend, extend whole height 28.5mm, and extend diameter of phi 60mm; Continue to extend, extend whole height 33mm, and extend diameter of phi 40mm, and now part is stairstepping, then through punching, washed out bottom surface; Entirety extended through amplification mould, whole diameter is Φ 40mm, and be highly 20mm, whole process all must be coated with lubricating oil, all needs full annealing after extending each time, eliminates stress again.

3. manufacturing process of repeatedly amplifying part according to claim 1, is characterized in that, after the quenching in step 7, is enclosed within outside part amplification hole with tubular Closing in die, carries out entirety closing in and correct.