CN103286536A

CN103286536A - Method for machining cross groove male die with cold heading technology

Info

Publication number: CN103286536A
Application number: CN2013102343497A
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: 2013-09-11
Anticipated expiration: 2033-06-14
Also published as: CN103286536B

Abstract

The invention provides a method for machining a cross groove male die with the cold heading technology. The method includes the following concrete steps: (1) machining and forming milling cutter, (2) after the cross groove profile of a forming punch is milled roughly with the forming milling cutter, performing finish machining with a forming grinding wheel to remove the allowance and meanwhile controlling the size b, the size e and the size f of the forming punch and the compound angle gamma and the compound delta of the forming punch, (3) punching a forming pressing die with the forming punch, and (4) forming the cross groove male die in a pressing mode with the forming pressing die. While the material and the hardness of the male die are kept unchanged, the auxiliary tools including the forming milling cutter, the forming punch and the forming pressing die get involved and the punching process is improved. Thus, not only can the boundary dimensions of the cross groove male die be reflected fairly well, but also the method can be used for machining the cross groove at one time and will not cause the quality problems such as collapse on the periphery of the cross groove and changing of the angle of a countersunk head when the head portion is formed. Anti-fatigue strength of parts is obviously promoted, and while precision requirements are met, the method has the advantages of saving time and material.

Description

Adopt the method for cold heading technique processing cross recess formpiston

Technical field

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

Background technology

Usually select the cross recess part to fix in the aviation enterprise on the aircraft skin structure, be that the countersunk raised head shape mainly is to satisfy the aerodynamically-shaped needs of aircraft with the head design of cross recess part, simultaneously in order to satisfy its mechanics and stability, the head of cross recess part need adopt the multi-angle profile, as shown in Figure 1.

Cross recess machining parts used in everyday is first chance extra bus workpieces profile, back punching out cross recess on punch press.Occur easily subsiding around the cross recess with above-mentioned process processing cross recess part, head countersunk head angle changes serious, and the cross recess degree of depth of part control inaccuracy, part cross groove depth, to cause part strength low, and rupture at part head and polished rod transition position easily, the part cross recess is shallow, do not reach the requirement of design pretightning force during the part assembling, have a strong impact on the assembly quality of part.In sum, the cross recess part adopts traditional processing method to cause part quality to guarantee, production can't be carried out.

For the drawback that overcomes cross recess part conventional machining process and in order to satisfy the needs of producing in batches, those skilled in the art select for use the cross formpiston to process when processing cross recess part head, as shown in Figure 2.The formpiston part is because the protruding profile that cross recess part head is complementary constitutes, and the head sizes with the cross recess part that so just can be intact reflects.Because it is complex-shaped for the cross recess formpiston, it is various to relate to size, and material hardness is high to be difficult for processing (material of selecting for use 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 purpose of this invention is to provide a kind of method that adopts cold heading technique processing cross recess formpiston, guaranteeing under the constant situation of formpiston material and hardness, after intervention by profile milling cutter, moulding drift, moulding stamper aid and the improvement of punching press work step, the appearance and size of reflection cross recess formpiston that not only can be intact, and can once when the head moulding, process cross recess and not produce and subside around the cross recess and quality problems such as countersunk head angle change, the part fatigue resistance obviously improves, and has the effect of when joint, material-saving when satisfying required precision.

Technical scheme of the present invention: adopt the method for cold heading technique processing cross recess formpiston, comprise following concrete steps:

(1) machine-shaping milling cutter;

(2) rough mill the cross grooved of moulding drift with profile milling cutter after, adopt forming grinding wheel fine finishining to remove surplus, control size b, e, f and compound angle γ, the δ of moulding drift simultaneously;

(3) with moulding drift punch forming pressing mold;

(4) with moulding stamper compacting cross recess formpiston.

The forming grinding wheel that adopts in the above-mentioned steps (2) is that granularity is 180 corundum sand wheel, and the profile of this emery wheel is tailored with the profile complementation of profile milling cutter and by inspection template and carried out the precision detection.

Described forming grinding wheel is when tailoring, by adopting the workbench rotating pad to add thickness feeler and using microscope to make the peak of emery wheel and adamantine peak at grade.

Beneficial effect of the present invention: the present invention mills the special process arrangement of moulding drift, moulding drift punch forming pressing mold, moulding stamper counter cross recess formpiston by profile milling cutter, can realize the processing of a series of cross recess formpistons such as countersunk head, countersunk raised head, the dimensional accuracy height of the cross recess formpiston that processes, hardness is good, be difficult for formation abrasion, therefore adopt this cross recess formpiston processing cross recess part, not only guaranteed the qualification rate of cross recess part, and the production cycle is shortened greatly, improved the production efficiency of cross recess part; Emphasis of the present invention designs the processing technology of moulding drift, adopting granularity is that 180 corundum sand wheel makes the cross drift intersection point that processes be of a size of cusp, eight intersection points of four distinguish of profile are cusp, therefore the cross drift that processes not only meets dimensional requirement, and guaranteed the photometric requirement of profile, adopt the forming grinding wheel that detects through precision can guarantee profile precision and the degree of accuracy of the cross drift that processes simultaneously; Forming grinding wheel is when tailoring, by adopting the workbench rotating pad to add thickness feeler and using microscope to make the peak of emery wheel and adamantine peak at grade, can guarantee the accurate of forming grinding wheel angle, and then make size b, e, the f of moulding drift unaffected, guaranteed the precision of cross recess part profile.

Description of drawings

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 moulding drift.

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 among 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.

The specific embodiment

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, identical with milling cutter processing commonly used, material selection W18Cr4V, tooth Profile Machining is finished by milling and sharpening, the back of tooth and angle divide thick fine finishining to carry out by relief grinding, machine the back and hand over the close control chamber to test, and determine to guarantee size α and the e of profile milling cutter;

(2) rough mill the cross grooved of moulding drift with profile milling cutter after, adopt forming grinding wheel fine finishining to remove surplus, size b, e, the f of control moulding drift, adopt the canned folder of folder to realize that the accurate location of moulding drift is with control compound angle γ, δ simultaneously, the material selection Cr12MoV of moulding drift, extremely shown in Figure 8 as Fig. 5;

(3) with moulding drift punch forming pressing mold, the material of moulding stamper is selected Cr12MoV equally for use, and is extremely shown in Figure 13 as Fig. 9;

(4) with moulding stamper compacting cross recess formpiston.

The forming grinding wheel that adopts in the above-mentioned steps (2) is that granularity is 180 corundum sand wheel, and the profile of this emery wheel is tailored with the profile complementation of profile milling cutter and by inspection template and carried out the precision detection, as Figure 14 and shown in Figure 15.

Described forming grinding wheel is when tailoring, by adopting the workbench rotating pad to add thickness feeler and using microscope to make the peak of emery wheel and adamantine peak at grade.Concrete steps are as follows: as shown in figure 16, establishing α earlier is the angle that forming grinding wheel need be processed, and by sin α/2 * 150 °=A, namely adds the thickness feeler of A value, behind the thickness feeler that is encased inside the A value, and the workbench β that will rotate to an angle; Use the adamantine peak D point of microscopic then, till clear, adjust the peak C point of emery wheel again, the peak that makes both is again on the same plane, still till clear, finishes adjustment work this moment.

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;

(3) with moulding drift punch forming pressing mold;

(4) with moulding stamper compacting cross recess formpiston.

2. employing cold heading technique as claimed in claim 1 is processed the method for cross recess formpiston, it is characterized in that the forming grinding wheel that adopts in the step (2) is that granularity is 180 corundum sand wheel, the profile of this emery wheel is tailored with the profile complementation of profile milling cutter and by inspection template and is carried out the precision detection.

3. employing cold heading technique as claimed in claim 2 is processed the method for cross recess formpiston, it is characterized in that: described forming grinding wheel is when tailoring, by adopting the workbench rotating pad to add thickness feeler and using microscope to make the peak of emery wheel and adamantine peak at grade.