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Method and device for measuring friction factor of plastic micro forming

A technology of friction factor and measurement method, which is applied in the direction of measuring devices, mechanical devices, instruments, etc., can solve the problems of measurement errors of small-sized samples, and achieve the effect of high precision and simple experimental devices

Inactive Publication Date: 2015-03-25
SHENZHEN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] For this reason, the present invention proposes a solution in order to solve the problem that the traditional friction factor measurement method has very large errors in the measurement of micro-sized samples, and the ring compression test method usually used in the measurement of the friction coefficient of plastic micro-forming in the measurement of the inner diameter of the ring. Method and device for measuring friction factor of plastic microforming

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  • Method and device for measuring friction factor of plastic micro forming
  • Method and device for measuring friction factor of plastic micro forming
  • Method and device for measuring friction factor of plastic micro forming

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Embodiment 1

[0026] Such as figure 1 As shown, the measuring device used in the method for measuring the friction factor of plastic microforming in this embodiment is composed of an indenter 1, a sample 2, a positioning ring 3, a mold 4, a fixing ring 5, etc., and their combination sequence is as follows: And the indenter 1, the sample 2, the positioning ring 3, the mold 4 and the fixing ring 5 are arranged in sequence. The pressure head 1 can move up and down.

[0027] Both the mold 4 and the positioning ring 3 adopt a split design, the mold 4 is composed of two split molds, and the positioning ring 3 is composed of two split positioning rings. The split mold 4 is designed to facilitate the removal of parts, and the divided positioning ring 3 is designed to facilitate the removal of the positioning ring 3 after the indenter compresses the sample.

[0028] The sample 2 is cylindrical, and the positioning ring 3 after the two petals are bonded is in the shape of an inverted cup. The posi...

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Abstract

The invention discloses a method for measuring a friction factor of plastic micro forming. The technical problem that a large error is generated when the friction factor of a sample of a micro size is measured in the prior art is solved. According to the technical scheme of the invention, cylindrical samples of a certain size are compressed on a mold of which the center is provided with a mold hole, and the samples generate deformation of different degrees according to different friction factors. If the friction factor is small, most of samples flow to two sides, few samples flow into the hole, and a formed rod piece is short in size; and if the friction factor is large, the few samples flow to two sides, most of the samples flow into the hole, and the formed rod piece is long in size. The length of the rod piece is measured and is compared with a friction factor correction curve, so that the friction factors under the condition can be determined. Because the friction factor is determined by measuring the length of an extrusion rod according to the method, the error generated by the measurement of the friction factor of the sample of the micro size is extremely small.

Description

technical field [0001] The invention relates to a method for measuring the friction factor of plastic micro-forming. Specifically, it is a method for testing the friction factor of micro-plastomers, which belongs to the field of precision forming micro-friction. Background technique [0002] In the plastic forming process, the friction between the blank and the die is one of the most important factors affecting the metal forming process, which is related to the forming limit, die life, surface quality, etc. The determination of the existing plastic forming friction factor is mainly realized by ring compression. Ring compression experiments such as Figure 5 , 6 As shown in Fig. 1, a ring of a certain size (the dotted line in the view) is placed on the material testing machine for compression, and the sample deforms to different degrees according to the friction factor. If the friction factor is small, the inner diameter of the ring (solid line in the view) increases after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/02
Inventor 龚峰马将
Owner SHENZHEN UNIV
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