Forming die for expanding rod die of short polish rod countersunk head type bolt

Abstract

The invention discloses a short polish rod countersunk head type bolt expansion rod die forming die which is composed of a die sleeve and a die core arranged in the die sleeve. The shape of the head of the short polish rod countersunk head type bolt and the size of a polish rod part serve as the size standard of the mold core; the die core is made of YG20C, the hardness HRA is larger than 84 after heat treatment, the die sleeve is made of T10A, the hardness HRA is 44-48 after heat treatment, and the final surfaces of the die core and the die sleeve are passivated. Raw materials are saved, and the production cost is reduced; machining is stable and reliable, and the product quality is improved; the processing efficiency is high, the production period is shortened and the production cost is reduced; use is easy, and the requirement for the skill level of machining personnel is low; the upsetting forming die is simple in structure, easy to machine and manufacture and low in cost.

Description

Technical Field

[0001] The invention relates to a forming die for a short smooth rod countersunk bolt expansion rod die, belonging to the technical field of manufacturing mechanical processing parts. Background Art

[0002] At present, short smooth rod countersunk bolt expansion rods are widely used in aircraft, electronic components, instruments and meters, and the demand is large. This type of product is produced frequently and in large quantities.

[0003] Since the short-stem countersunk bolt expansion rod has a relatively short polished rod, it is difficult to form the polished rod. There are two traditional processing methods for this type of product: 1. Grind the diameter of the thread rolling blank after butt processing, such as Figure 1 and Figure 2 As shown; 2. Lengthen the bolt shank and clamp the extended part for processing, such as Figure 3 and Figure 4 shown.

[0004] Both of the above processing methods have disadvantages: 1. The method of grinding the diameter of the thread rolling blank after butt processing has low processing efficiency, poor stability, high processing cost and long product production cycle, and requires high skill level of processing personnel; 2. The method of lengthening the bolt rod and clamping the lengthened part for processing wastes raw materials, has low processing efficiency, poor stability, high processing costs and a long product production cycle. Summary of the invention

[0005] The present invention aims to solve the technical problems of relatively wasteful raw materials, low processing efficiency, poor stability, high processing cost, long product production cycle, high skill level requirements for processing personnel, and great difficulty in molding the part.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A short-shaft countersunk bolt expansion rod forming die is composed of a die sleeve and a die core arranged in the die sleeve; the die core takes the shape of the head of the short-shaft countersunk bolt and the size of the bare rod as the size reference of the die core; the die core material is YG20C, and the hardness reaches HRA>84 after heat treatment; the die sleeve material is T10A, and the hardness reaches HRC44-48 after heat treatment; the final surface treatment of the die core and the die sleeve is passivation.

[0007] The beneficial effects of adopting the above technical solution are: The invention saves raw materials and reduces production costs; the processing is stable and reliable, and the product quality is improved; the processing efficiency is high, the production cycle is shortened and the production cost is reduced; it is simple to use and has low requirements on the skill level of the processing personnel; the upsetting molding mold has a simple structure, is easy to process and manufacture, and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the structure after docking.

[0009] Figure 2 Schematic diagram of the structure after butt machining and grinding to remove the tool mark.

[0010] Figure 3 This is a schematic diagram of the structure after the rod is lengthened.

[0011] Figure 4 This is a schematic diagram of the structure after the rod clamping and lengthening part is processed.

[0012] Figure 5 This is a schematic diagram of the structure of a short-bar countersunk bolt.

[0013] Figure 6 It is a schematic structural diagram of a forming die for a short smooth rod countersunk bolt expansion rod die of the present invention.

[0014] Figure 7 for Figure 6 A partial enlarged view of point A in the middle.

[0015] In the figure: 1- mold sleeve, 2- mold core.

[0016] Figure 8 This is the schematic diagram of cutting short-stem countersunk bolts.

[0017] Fig. 9 This is a schematic diagram of the structure of a short-stem countersunk bolt after cutting.

[0018] Fig.10 This is the schematic diagram of the initial upsetting of short-stem countersunk bolts.

[0019] Fig.11 This is a schematic diagram of the structure of a short-stem countersunk bolt after initial upsetting.

[0020] Fig.12 This is the principle diagram of forming short smooth rod countersunk bolts.

[0021] Fig.13 This is a schematic diagram of the structure of a short-bar countersunk bolt after forming.

[0022] Fig.14 for Fig.13 A partial enlarged view of point B. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] A short-ballast countersunk bolt expansion rod forming die is composed of a die sleeve 1 and a die core 2 arranged in the die sleeve 1. During processing, the head and the polished rod of the short-ballast countersunk bolt can be processed and formed at one time on a cold heading machine. Figure 8-Figure 14 As shown, no CNC machining is required; the mold core 2 takes the shape of the head of the short polished rod countersunk bolt and the size of the polished rod as the size reference of the mold core 2; the mold core 1 is made of YG20C, and its hardness reaches HRA>84 after heat treatment; the mold sleeve 2 is made of T10A, and its hardness reaches HRC44~48 after heat treatment; the final surface treatment of the mold core 1 and the mold sleeve 2 is passivation.

Claims

1. A short-ballast countersunk bolt expansion rod forming die, characterized in that: The mold core (2) is composed of a mold sleeve (1) and a mold core (2) arranged in the mold sleeve (1). The mold core (2) has a size reference based on the shape of the head of a short-shaft countersunk bolt and the size of the polished rod. The mold core (1) is made of YG20C, and its hardness reaches HRA>84 after heat treatment. The mold sleeve (2) is made of T10A, and its hardness reaches HRC44-48 after heat treatment. The final surface treatment of the mold core (1) and the mold sleeve (2) is passivation.

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