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Plastic forming method of inner hexagonal hole of a slender bar

A plastic forming, hexagonal hole technology, applied in the direction of connecting components, threaded fasteners, bolts, etc., can solve the problems of female mold rupture, reduce production efficiency, affect product quality, etc., and achieve the effect of reducing mold life and improving mold life.

Active Publication Date: 2020-05-05
AVIC STANDARD PARTS MFG
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  • Application Information

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Problems solved by technology

However, due to the limited fluidity of the workpiece material, when this process is applied to slender rods (length-to-diameter ratio ≥ 5), it is easy to cause the outer diameter of the inner hexagonal hole to expand, the die to break and the hexagonal punch to be damaged. Problems such as pulling out require additional processing and frequent mold changes, which not only affects product quality, but also reduces production efficiency, thus hindering mass production of such products

Method used

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  • Plastic forming method of inner hexagonal hole of a slender bar
  • Plastic forming method of inner hexagonal hole of a slender bar
  • Plastic forming method of inner hexagonal hole of a slender bar

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Embodiment Construction

[0028] A plastic forming method for an inner hexagonal hole of a slender rod, comprising the following steps:

[0029] (1) Cutting (see Figure 5 , 6 ): Determine the raw material diameter d0 according to the specifications of the final workpiece, then calculate and determine the blanking length L0 according to the volume of the workpiece and the determined raw material diameter, and cut off;

[0030] (2) End face shaping (see Figure 7 , 8 ): Automated production with a three-station cold heading machine, as the first station, determine the shaping size according to the size of the final workpiece, prefabricate the mouth spot spot and chamfer, and the prefabricated mouth spot spot size is in accordance with the final workpiece mouth spot spot size Confirm that the diameter size D and angle a are the same as the final product size, the depth t1 is about 0.25~0.35 hexagonal compared to the width S, and the chamfer size is consistent with the final product chamfer size;

[0...

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Abstract

The invention discloses a plastic forming method of an internal hexagonal hole of a long and thin rod. The plastic forming method of the internal hexagonal hole of the long and thin rod comprises thefollowing steps of blanking; end face shaping on a first station, and prefabrication of a counter bore and a bevel at an opening; thin extrusion on a second position, specifically, an internal hexagonal hole section is extruded to be thin; and formation on a third station, specifically, the internal hexagonal hole is formed. According to the plastic forming method of the internal hexagonal hole ofthe long and thin rod, the service life of a die is long, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a plastic forming method for inner hexagonal holes of slender rods. Background technique [0002] set screw (see figure 1 , 2 ) is one of the common fasteners, and it is also a common standard part. It is mainly used for positioning and locking. It is used in various machinery and equipment. The annual market demand is no less than 1 billion pieces. Cylindrical rod-shaped parts with inner hexagonal holes are blanks before rolling threads of set screws with a nominal diameter not greater than M24 produced in batches. [0003] The blank is automatically produced on a double-click cold heading machine or a double-station cold heading machine. The cold heading process is blanking, end face shaping (the first station: prefabricated mouth countersink and chamfering), forming (the second station : Formed inner hexagonal hole). However, due to the limited fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/46
CPCB21K1/463
Inventor 王恩洪杨秀珍杨正侣
Owner AVIC STANDARD PARTS MFG
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