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Powder metallurgy static mould wall lubricating device

A mold wall lubrication and powder metallurgy technology, applied in the field of powder metallurgy, can solve the problems of use, high cost, limited selection of lubricating powder, etc., and achieve the effect of great flexibility and easier maintenance.

Inactive Publication Date: 2005-06-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because, after rubbing through the powder delivery hose, if the lubricating powder should be able to generate enough electrostatic charge, in the electrostatic sequence list, its position should be far away from the material of the powder delivery hose, which greatly limits the amount of the lubricant powder. However, there are often lubricating powders with better lubricating effect but cannot be used by the device
This is the most fatal shortcoming of electrostatic mold wall lubrication
[0007] 2. Instability of powder spraying
[0008] 3. The amount of static electricity is not easy to control
High cost, because the powder delivery hose is a multi-diameter friction gun, which greatly increases the cost of the device

Method used

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  • Powder metallurgy static mould wall lubricating device
  • Powder metallurgy static mould wall lubricating device
  • Powder metallurgy static mould wall lubricating device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0046] Example 1: Determination of the required amount of charge that the new electrostatic mold wall lubrication device can bring to each lubricating powder by means of corona discharge. Set the device with a voltage of 12KV as an example, each spraying time does not exceed 1 second, the powder spraying wind pressure is about 0.6MPa, and the length of the powder delivery hose is 1m. Use an electronic analytical balance (accuracy: 0.0001g) to measure the mass of the lubricating powder, and calculate the charge-to-mass ratio of the lubricating powder. The results are shown in the table below:

[0047]

lubricant powder

EBS wax

w-special

the wax

stearic acid

zinc

compound run

powder one

compound run

slippery powder two

compound run

slip powder three

compound run

Slippery powder four

compound run

Slippery five

charge to mass ratio

(μc / g)

0.166

...

example 2

[0050] Example 2: Spray lubricating powder on the inner wall of the mold with this new type of electrostatic mold wall lubrication equipment, and press 316L stainless steel powder (fineness: ≤74μm) by using external lubrication or a combination of internal and external lubrication under room / temperature pressure. At 680MPa, measure the green compact density with the micrometer method. The results of each experiment are shown in the table below:

[0051] to lubricate

Way

Internal lubrication

0.2% W-special wax

0.2% EBS wax

none

External lubrication

Compound lubricant powder six

Compound Lubricating Powder II

EBS wax

graphite

EBS wax

EBS wax

Pressed powder heating temperature

(℃)

120

120

120

120

120

120

120

room temperature

110

room temperature

mold heating temperature

(℃)

1...

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Abstract

The invention provides a powder metallurgy electrostatic mold wall lubrication device, which is characterized in that it consists of a general compressed air source, a high-voltage electrostatic generator (1), an airflow control system (2), a powder storage device, a powder spraying system, a powder storage Tube cabinet (3), powder conveying hose (7), circulation hose (8), powder spraying hose (9) are formed, and each interface is connected by hose. The advantage of the present invention is that: the innovation point of the novel electrostatic mold wall lubricating device is that the method of corona discharge is used. Corona discharge can make any kind of lubricating powder electrostatically charged, which has greater flexibility in the choice of lubricant, and the charge of lubricating powder can be better controlled. It is easy to maintain and can better control the powder output of lubricating powder. It is suitable for the lubrication of powder metallurgy electrostatic mold wall, and also can be used for the lubrication of other equipment in the field of metal processing and new materials.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular provides a powder metallurgy electrostatic mold wall lubrication device, which is suitable for the lubrication of powder metallurgy electrostatic mold walls, and can also be used for the lubrication of other appliances in the fields of metal processing and new materials. Background technique [0002] Powder metallurgy technology is a part processing technology through powder mixing, precision pressing and sintering. It can realize the near net forming of structural parts, especially iron-based and sintered steel-based parts, reduce a large number of mechanical processing procedures, and reduce production costs. Therefore, powder metallurgy structural parts are widely used in industries such as automobiles, machinery, instruments, household appliances, and food processing machines. Continuously reduce the processing costs of related industries. [0003] However, there...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/00B22F3/03
Inventor 果世驹陈邦峰杨霞胡学晟魏延平
Owner UNIV OF SCI & TECH BEIJING
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