CN103286536B

CN103286536B - Adopt the method for cold heading technique processing cross recess formpiston

Info

Publication number: CN103286536B
Application number: CN201310234349.7A
Authority: CN
Inventors: 邓楠; 徐强; 孙翔宇
Original assignee: Shenyang Aircraft Industry Group Co Ltd
Current assignee: Shenyang Aircraft Industry Group Co Ltd
Priority date: 2013-06-14
Filing date: 2013-06-14
Publication date: 2015-10-28
Anticipated expiration: 2033-06-14
Also published as: CN103286536A

Abstract

The invention provides a kind of method adopting cold heading technique to process cross recess formpiston, comprise following concrete steps: 1. machine-shaping milling cutter; 2., rough mill the Phillips-type of forming punching head with profile milling cutter after, adopt forming grinding wheel fine finishining to remove surplus, control the size b of forming punching head, e, f and compound angle γ, δ simultaneously; 3. forming punching head punch forming pressing mold is used; 4. with moulding stamper compacting cross recess formpiston.The present invention is when ensureing formpiston material and hardness is constant, after the intervention of profile milling cutter, forming punching head, moulding stamper aid and the improvement of punching press work step, the appearance and size of reflection cross recess formpiston that can not only be intact, and once can process cross recess when head is shaping and not produce and to subside around cross recess and the quality problems such as countersunk head Angulation changes, part fatigue resistance significantly improves, when having a joint while meeting required precision, effect of material-saving.

Description

Adopt the method for cold heading technique processing cross recess formpiston

Technical field

The present invention relates to a kind of method adopting cold heading technique to process cross recess formpiston, belong to mechanical processing technique field.

Background technology

In Aviation Enterprise, aircraft skin structure is selected usually cross recess part to fix, be the needs that countersunk raised head shape mainly meets aircraft air power profile by the head design of cross recess part, simultaneously in order to meet its mechanics and stability, the head of cross recess part need adopt multi-angle profile, as shown in Figure 1.

The processing method of cross recess part used in everyday is first chance extra bus workpieces profile, after on punch press punching cross recess.Easily occur subsiding around cross recess with above-mentioned process processing cross recess part, head countersunk head Angulation changes is serious, and the cross recess severity control inaccuracy of part, part cross groove depth, part strength will be caused low, and easily rupture at part head and polished rod transition position, part cross recess is shallow, do not reach the requirement of design pretightning force during Assembly of the parts, have a strong impact on the assembly quality of part.In sum, cross recess part adopts traditional processing method to cause part quality to ensure, production cannot be carried out.

In order to overcome the drawback of cross recess part conventional machining process and the needs in order to satisfied batch production, those skilled in the art select cross formpiston to process when processing cross recess part head, as shown in Figure 2.Formpiston part is formed due to the protruding profile of cross recess part fit heads, so just can the be intact head sizes of cross recess part be reflected.Due to cross recess formpiston, it is complex-shaped, and relate to size various, material hardness height is not easily processed (material selected is Cr12MoV, and hardness is HRC58-62), and formpiston punching press shape and the bad control of the degree of depth, therefore makes it be processed into a difficult problem.

Summary of the invention

The object of this invention is to provide a kind of method adopting cold heading technique to process cross recess formpiston, when ensureing formpiston material and hardness is constant, after the intervention of profile milling cutter, forming punching head, moulding stamper aid and the improvement of punching press work step, the appearance and size of reflection cross recess formpiston that can not only be intact, and once can process cross recess when head is shaping and not produce and to subside around cross recess and the quality problems such as countersunk head Angulation changes, part fatigue resistance significantly improves, when having a joint while meeting required precision, effect of material-saving.

Technical scheme of the present invention: the method adopting cold heading technique processing cross recess formpiston, comprises following concrete steps:

(1) machine-shaping milling cutter;

(2), rough mill the Phillips-type of forming punching head with profile milling cutter after, adopt forming grinding wheel fine finishining to remove surplus, control the size b of forming punching head, e, f and compound angle γ, δ simultaneously;

(3) with forming punching head punch forming pressing mold;

(4) with moulding stamper compacting cross recess formpiston.

The forming grinding wheel adopted in above-mentioned steps (2) to be granularity be 180 Brown Alundum emery wheel, the profile of this emery wheel is tailored complementary with the profile of profile milling cutter and carries out Precision measurement by inspection template.

Described forming grinding wheel, when tailoring, adds thickness feeler by adopting worktable rotary pad and uses microscope to make the peak of emery wheel and adamantine peak at grade.

Beneficial effect of the present invention: the present invention is by the special process arrangement of profile milling cutter milling forming punching head, forming punching head punch forming pressing mold, moulding stamper counter cross recess formpiston, the processing of a series of cross recess formpiston such as countersunk head, countersunk raised head can be realized, the dimensional accuracy of the cross recess formpiston processed is high, hardness is good, not easily formation abrasion, therefore this cross recess formpiston is adopted to process cross recess part, not only ensure that the qualification rate of cross recess part, and the production cycle is shortened greatly, improve the production efficiency of cross recess part; The processing technology of emphasis of the present invention to forming punching head designs, adopt granularity be 180 Brown Alundum emery wheel make the cross drift intersection point processed be of a size of cusp, eight intersection points of profile four distinguish are cusp, therefore the cross drift processed not only meets dimensional requirement, and ensure that the photometric requirement of profile, the profile precision of the cross drift simultaneously adopting the forming grinding wheel through Precision measurement can ensure to process and the degree of accuracy; Forming grinding wheel is when tailoring, add thickness feeler by adopting worktable rotary pad and use microscope to make the peak of emery wheel and adamantine peak at grade, the accurate of forming grinding wheel angle can be ensured, and then make the size b of forming punching head, e, f unaffected, ensure that the precision of cross recess part profile.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of cross recess part.

Fig. 2 is the schematic diagram of cross recess formpiston.

Fig. 3 is the structural representation of profile milling cutter.

Fig. 4 is the side view of Fig. 3.

Fig. 5 is the structural representation of forming punching head.

Fig. 6 is the side view of Fig. 5.

Fig. 7 is the A-A view of Fig. 6.

Fig. 8 is the I-I view of Fig. 7.

Fig. 9 is the structural representation of moulding stamper.

Figure 10 is the partial enlarged drawing of Q in Fig. 9.

Figure 11 is the side view of Fig. 9.

Figure 12 is the A-A view of Figure 11.

Figure 13 is the B-B view of Figure 12.

Figure 14 is the structural representation of forming grinding wheel.

Figure 15 is the structural representation of inspection template.

Figure 16 is the structural representation of forming grinding wheel when tailoring.

Detailed description of the invention

Adopt the method for cold heading technique processing cross recess formpiston, comprise following concrete steps:

(1) machine-shaping milling cutter, as shown in Figure 3 and Figure 4, process identical with conventional milling cutter, material selection W18Cr4V, tooth Profile Machining has been come by milling and sharpening, the back of tooth and angle are divided thick fine finishining to carry out by relief grinding, machine rear friendship close control room and test, and determine the size α and the e that ensure profile milling cutter;

(2) rough mill the Phillips-type of forming punching head with profile milling cutter after, forming grinding wheel fine finishining is adopted to remove surplus, control the size b of forming punching head, e, f, adopt the canned folder of folder to realize the precise positioning of forming punching head to control compound angle γ, δ simultaneously, the material selection Cr12MoV of forming punching head, as shown in Fig. 5 to Fig. 8;

(3) with forming punching head punch forming pressing mold, the material of moulding stamper selects Cr12MoV equally, as shown in Fig. 9 to Figure 13;

(4) with moulding stamper compacting cross recess formpiston.

The forming grinding wheel adopted in above-mentioned steps (2) to be granularity be 180 Brown Alundum emery wheel, the profile of this emery wheel is tailored complementary with the profile of profile milling cutter and carries out Precision measurement by inspection template, as shown in Figure 14 and Figure 15.

Described forming grinding wheel, when tailoring, adds thickness feeler by adopting worktable rotary pad and uses microscope to make the peak of emery wheel and adamantine peak at grade.Concrete steps are as follows: as shown in figure 16, first set α to need the angle of processing as forming grinding wheel, by sin α/2 × 150 °=A, namely add the thickness feeler of A value, and when after the thickness feeler being encased inside A value, workbench will rotate to an angle β; Then use microscopic adamantine peak D point, till clear, then adjust the peak C point of emery wheel, the peak making both is again on same plane, still till clear, now completes adjustment work.

Claims

1. adopt the method for cold heading technique processing cross recess formpiston, it is characterized in that, comprise following concrete steps:

(1) machine-shaping milling cutter;

(2), rough mill the Phillips-type of forming punching head with profile milling cutter after, adopt forming grinding wheel fine finishining to remove surplus, control the size b of forming punching head, e, f and compound angle γ, δ, wherein b, e, f are as shown in Figure 6 simultaneously, and γ, δ are as shown in Figure 5;

(3) with forming punching head punch forming pressing mold;

(4) with moulding stamper compacting cross recess formpiston.

2. the method adopting cold heading technique processing cross recess formpiston as claimed in claim 1, the forming grinding wheel that it is characterized in that adopting in step (2) is granularity is 180 object Brown Alundum emery wheels, and the profile of this Brown Alundum emery wheel is tailored complementary with the profile of profile milling cutter and carries out Precision measurement by inspection template.