Machining method of titanium alloy high-locking bolt

Abstract

The invention discloses a method for machining a titanium alloy high-locking bolt before thread rolling. Comprising the following steps of head forming, thread rolling diameter thinning, head end face and outer circle flattening and full-profile grinding. According to the method, the head is subjected to upsetting forming and thread rolling diameter extrusion forming in the upsetting process, loss of a large number of materials in the follow-up turning and grinding process is avoided, and therefore the material cost is saved. Meanwhile, the full-profile grinding process is adopted, the size consistency and machining precision of products are improved, and compared with a traditional turning process, the machining yield can be remarkably increased, and cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fasteners, and in particular to a processing method before thread rolling of a titanium alloy high-locking bolt. Background Art

[0002] In recent years, titanium alloy high-locking bolts have been widely used in the fields of aviation and aerospace, and the exploration and optimization of their processing technology has never stopped. Traditional processing methods can no longer meet the current factory's needs for high quality, low cost and high efficiency. The traditional processing technology for titanium alloy high-locking bolts in the prior art is: head forming-heat treatment-turning reference-turning countersunk angle surface, head outer circle, head end face, polished rod-turning rolling diameter, flat end-thread rolling-drilling, punching square-cold extrusion R. Before using the turning process to process high-locking bolts, the grinding process was tried to be used for product processing, but the domestic green carbon grinding wheel used in ordinary grinders wore too fast during processing, resulting in too high a grinding wheel dressing frequency and too fast a size change. Therefore, a large number of turning processes were used. However, the larger turning size will affect the final surface roughness of the parts. Compared with the grinding process, it is easier to form machining residual stress on the surface of the parts; more materials are removed, and the price of titanium alloy materials is expensive, resulting in a large amount of material waste, and the procurement cycle of imported materials is long, ranging from 6 months to one year. The waste of materials increases the cost, and the dimensional consistency and processing accuracy are poor. Summary of the invention

[0003] The purpose of the present invention is to overcome the above disadvantages and provide a method for processing titanium alloy high-lock bolts before thread rolling, which can significantly improve the processing yield and reduce costs by squeezing the thread rolling diameter into a fine shape during the upsetting process before the thread rolling process, thereby avoiding a large amount of material loss during the subsequent turning and grinding processes. At the same time, the full-surface grinding process is adopted to improve the dimensional consistency and processing accuracy of the product. Compared with the traditional turning process, the processing yield can be significantly improved and the cost can be reduced.

[0004] The purpose of the present invention and the solution of its main technical problems are achieved by adopting the following technical solutions: A processing method for a titanium alloy high-locking bolt before thread rolling of the present invention is characterized by comprising the following steps: 1) Head forming and thread rolling diameter reduction: During the upsetting process, the head is upset and the thread rolling diameter is extruded.

[0005] 2) Processing of the head end face and the rod end face: Turn the head end face and the head outer circle, flatten the rod end face, ensure the total length, and perform R-turning and denting on the rod end face; 3) Full surface grinding: The product is processed using full-surface grinding technology, including grinding the countersunk angle surface, the outer circle of the rod, the transition R, and the thread rolling diameter.

[0006] The upsetting temperature in step 1) is 600-700°C.

[0007] Compared with the prior art, the present invention has obvious beneficial effects. From the above technical scheme, it can be seen that by extruding the rolling diameter into a fine shape during the upsetting process, a large amount of material loss in the subsequent turning and grinding processes is avoided, thereby saving material costs. At the same time, the full-surface grinding process is adopted to improve the dimensional consistency and processing accuracy of the product. Compared with the traditional turning process, it can significantly improve the processing yield and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the warm forging process diagram; Figure 2 Flat head end surface and outer circle processing drawing; Figure 3 The end surface of the flat rod is processed to maintain the total length, reverse R, and groove; Figure 4 Full surface grinding process diagram. DETAILED DESCRIPTION

[0010] The specific implementation methods, structures, features and functions of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0011] Example 1 A processing method for a titanium alloy high-locking bolt before thread rolling of the present invention comprises the following steps: 1) Head forming and thread rolling diameter reduction: During the upsetting process, the head is upset and the thread rolling diameter is extruded, wherein the upsetting temperature is 600°C.

[0012] 2) Processing of the head end face and the rod end face: Turn the head end face and the head outer circle, flatten the rod end face, ensure the total length, and perform R-turning and denting on the rod end face; 3) Full surface grinding: The product is processed using full-surface grinding technology, including grinding the countersunk angle surface, the outer circle of the rod, the transition R, and the thread rolling diameter.

[0013] Example 2 A processing method for a titanium alloy high-locking bolt before thread rolling of the present invention comprises the following steps: 1) Head forming and thread rolling diameter reduction: During the upsetting process, the head is upset and the thread rolling diameter is extruded, wherein the upsetting temperature is 650°C.

[0014] 2) Processing of the head end face and the rod end face: Turn the head end face and the head outer circle, flatten the rod end face, ensure the total length, and perform R-turning and denting on the rod end face; 3) Full surface grinding: The product is processed using full-surface grinding technology, including grinding the countersunk angle surface, the outer circle of the rod, the transition R, and the thread rolling diameter.

[0015] Example 3 A processing method for a titanium alloy high-locking bolt before thread rolling of the present invention comprises the following steps: 1) Head forming and thread rolling diameter reduction: During the upsetting process, the head is upset and the thread rolling diameter is extruded, wherein the upsetting temperature is 700°C.

[0016] 2) Processing of the head end face and the rod end face: Turn the head end face and the head outer circle, flatten the rod end face, ensure the total length, and perform R-turning and denting on the rod end face; 3) Full surface grinding: The product is processed using full-surface grinding technology, including grinding the countersunk angle surface, the outer circle of the rod, the transition R, and the thread rolling diameter.

[0017] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A processing method for titanium alloy high locking bolts before thread rolling, characterized in that; The following steps are involved: 1) Head forming and thread rolling diameter reduction: During the upsetting process, the wire rolling diameter is squeezed and formed; 2) Processing of the head end face and the rod end face: Turn the head end face and the head outer circle, flatten the rod end face, ensure the total length, and perform R-turning and denting on the rod end face; 3) Full surface grinding: The product is processed using full-surface grinding technology, including grinding the countersunk angle surface, the outer circle of the rod, the transition R, and the thread rolling diameter.

2. A method for processing a titanium alloy high locking bolt as claimed in claim 1, characterized in that; The upsetting temperature in step 1) is 600-700°C.

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