Unlock instant, AI-driven research and patent intelligence for your innovation.

Stainless steel powder hot pressing shaping method

A technology of warm press forming and stainless steel, applied in the field of powder metallurgy, can solve the problems of unfavorable application and widespread promotion, deterioration of corrosion resistance of parts, reduction of strength of parts, etc., and achieve small dimensional deformation, small environmental pollution, and small demoulding force. Effect

Inactive Publication Date: 2005-06-15
UNIV OF SCI & TECH BEIJING
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this foreign technology still has relatively large defects and deficiencies, and the cost is relatively high, which is not conducive to application and widespread promotion.
[0007] In powder sintered steel, residual porosity reduces the strength of the part and deteriorates the corrosion resistance of the part

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Stainless steel powder hot pressing shaping method
  • Stainless steel powder hot pressing shaping method
  • Stainless steel powder hot pressing shaping method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1: 316L stainless steel powder and 0.2wt% EBS wax powder were used as pressed mixed powder, and the mixed powder was shaken for 0.5h. Use a new type of electrostatic mold wall lubrication injection device for mold wall lubrication. The lubricant powder is EBS wax. The electrostatic voltage is controlled below 10KV. The mold lead wire is grounded to facilitate the adsorption of charged lubricant powder on the mold wall. Weigh 5g of mixed powder and pour it Put it into a cylindrical mold cavity with a diameter of φ10.55mm, and press the mixed powder at room temperature or warm pressure under a pressing pressure of 550-950 MPa. During the warm-pressing process, the temperature of the powder and the mold were controlled at 110°C and 110°C by thermocouples, respectively. Measure the size of the green compact with a screw micrometer (error 0.001mm), weigh it with an electronic balance with a sensitivity of 0.0001g, and calculate the density value. As shown in Table 1...

example 2

[0028] Example 2: Stainless steel powder and 0.2wt% W-special wax powder are used as pressed mixed powder, and the mixed powder is shaken for 0.5h. The mold wall is lubricated with a new type of electrostatic mold wall lubrication injection device (to apply for a patent). The lubricating powder is respectively used: EBS wax, graphite, compound lubricating powder 1, and compound lubricating powder 2. The electrostatic voltage is controlled below 10KV, and the mold guide line is grounded. In order to facilitate the adsorption of the charged lubricating powder on the mold wall, weigh 5g of the mixed powder, pour it into a cylindrical mold cavity with a diameter of φ10.55mm, and press the mixed powder with warm pressure at a pressing pressure of 550-950MPa. During the warm pressing process, the temperature of the powder and the mold were controlled at 120°C and 130°C by thermocouples, respectively. Measure the size of the green compact with a screw micrometer (error 0.001mm), weig...

example 3

[0032] Example 3: Stainless steel powder and 0.2wt% W-special wax powder are used as pressed mixed powder, and the mixed powder is shaken for 0.5h. Use a new type of electrostatic mold wall lubrication injection device (to apply for a patent) for mold wall lubrication. Lubricant powder is used respectively: composite lubricant powder 1, composite lubricant powder 2, the electrostatic voltage is controlled below 10KV, and the mold guide line is grounded to facilitate the charged lubricant powder For adsorption on the mold wall, weigh 5g of the mixed powder, pour it into a cylindrical mold cavity with a diameter of φ10.55mm, and press the mixed powder with warm pressure at a pressing pressure of 550-950MPa. During the warm-pressing process, the temperature is controlled by a thermocouple, the mixed powder is heated to 120°C, and the molds are respectively heated to: 130°C, 140°C and 150°C. Measure the size of the green compact with a screw micrometer (error 0.001mm), weigh it wi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for warm pressing of 316L stainless steel powder. First, the 316L stainless steel pressed powder and the mold are heated, and a thermocouple is used to control the temperature of the 316L stainless steel pressed powder and the mold respectively. The heating temperature of the 316L stainless steel pressed powder is controlled at 100°C~ 140°C, the mold heating temperature is controlled at 100°C~160°C; the electrostatic mold wall lubrication device is used to spray composite lubricant powder on the inner wall of the mold, and the composition of the composite lubricant powder used is: 25%~75% EBS wax + 25%~75% graphite Or 25% to 75% W-special wax + 25% to 75% graphite, the mold guide line is grounded, and after the compound lubricant powder is sprayed, pour the heated 316L stainless steel pressed powder into the cavity of the mold for compression molding. It has the advantages of being able to obtain a higher density green body, meeting better dimensional accuracy requirements, simple operation and high pressing efficiency.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular provides a 316L stainless steel powder warm-press forming method, which provides a new way for high-density press-form metal powder. Background technique [0002] Due to its excellent corrosion resistance and good pressure processability, dense stainless steel parts manufactured by casting, forging and machining processes are widely used in industries such as watches, medical machinery, household appliances, food processing machinery and even jewelry. Powder metallurgy technology can realize the near-net shape of parts, reduce a large number of mechanical processing procedures, and reduce production costs. Therefore, it is increasingly hoped that the powder metallurgy 316L stainless steel parts related to the above industries can be prepared by the process of powder mixing, precision pressing and sintering, so as to reduce the comprehensive production cost of appliance...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/14C22C33/02
Inventor 果世驹陈邦峰杨霞胡学晟魏延平
Owner UNIV OF SCI & TECH BEIJING