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High speed pressing and forming method of warm powder and device thereof

A high-speed pressing and powder technology, applied in the field of powder metallurgy, can solve the problems of restricting research and development, unable to achieve high-speed pressing and forming of warm powder, and achieve the effects of avoiding uneven density distribution, simple structure and low cost.

Inactive Publication Date: 2010-06-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above-mentioned high-speed press-forming equipment has supporting heating equipment, and cannot realize high-speed press-formation of warm powder, and no high-speed press specially used for warm powder has come out, which greatly limits the research and development of this technology.

Method used

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  • High speed pressing and forming method of warm powder and device thereof
  • High speed pressing and forming method of warm powder and device thereof
  • High speed pressing and forming method of warm powder and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A warm powder high-speed pressing forming method is an integrated technology of warm pressing and high-speed pressing forming. This technology uses a motor to adjust the falling height of the hammer to obtain different impact velocities under different falling heights of the hammer. The impact stress wave transmits energy to the warm powder through the upper die punch, so that the warm powder can be formed rapidly and densely. The warm powder high-speed compression molding device that realizes the above method is as figure 1 As shown, it includes a fixed pulley 1, a motor 2 with a model of MR5130 and a power of 40W, a frame 3, a guide cylinder 4, a hammer with a mass of 10kg 5, an upper template 6, a side template 7, and a photoelectric sensor and a pulse meter. Partially composed speedometer 8, in which the photoelectric sensor is BR20M-TDTL through-beam photoelectric sensor, upper and lower die punches 9, 11, pressure plate 10, model CYL203, pressure sensor 12 with a ...

Embodiment 2

[0034] This embodiment adopts the mold wall lubrication technology on the basis of Example 1, that is, evenly coats 1 μm thick HW absolute ethanol suspension in the cavity of the mold 13. Example 1 is the same. figure 2 It is the shock wave suppression curve under the condition of using or not adopting the mold wall lubrication technology in the method of the present invention. from figure 2 The maximum impact force is 349.1KN, the action time is about 34ms, and the green density of the sample is 7.61g / cm 3 , The green stripping force is 45.3KN. It can be seen that the combination of warm powder high-speed pressing and mold wall lubrication technology increases the maximum impact force by about 42.8KN, and prolongs the action time of powder by about 12ms, thus further increasing the density of the green body and reducing the demoulding force, so that the powder metallurgy products can reach a high level. The level is nearly finalized.

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Abstract

The invention discloses a high speed pressing and forming method of warm powder and a device thereof. The method is an integrated technology of warm-pressing as well as high speed pressing and forming, takes the gravitational potential energy of a drop hammer as pressing energy, a punch hammer falls down to impact on an upper punch to transfer the energy to the powder so as to rapidly and densely form the powder. The punch hammer rope of the device for carrying out the method is connected with a motor by a pulley installed above a guide cylinder and is kept to freely and vertically move in the guide cylinder; a speedometer is symmetrically installed on the two sides of a side die plate; a heating ring is directly sleeved on a die; a pressure sensor is contacted with the lower die punch and is connected with a data acquisition card; and the data acquisition card is connected with a computer by a USB interface. The pressing graph of a shock wave is displayed on the computer, and the maximum value of an impact force and the time impacting on the powder can be directly read from the graphs; and the invention has simple structure, convenient use, reliability and practicability as well as relative low price, is particularly suitable for colleges and universities as well as research and development institutions.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a warm powder high-speed pressing forming method and a device thereof. Background technique [0002] High velocity compaction (HVC for short) forming technology is a hot spot in the research and development of powder metallurgy technology. The research on high-speed pressing at home and abroad is still in the exploratory stage, and the research on its key manufacturing technology and densification mechanism is not yet in-depth. Powder metallurgy high-speed pressing technology is a Swedish metallurgical powder manufacturer A new process and new technology of powder metallurgy jointly researched and developed by AB and equipment manufacturer Hydropulsor AB in 2001. This technology is the result of an extreme extension of the traditional powder compaction technology. Specifically, the high-speed impact of the heavy hammer is used to generate powerful shock wave energy to densif...

Claims

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Application Information

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IPC IPC(8): B22F3/03
Inventor 肖志瑜唐翠勇陈进邓三才邵明李元元
Owner SOUTH CHINA UNIV OF TECH
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