Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Sintered material for valve guides and production methods therefor

A valve guide and raw material technology, applied in the field of sintered valve guide materials and its preparation, can solve the problems of harsh sliding environment, reduced lubricating oil supply, etc., and achieve the effect of maintaining wear resistance and low cost

Active Publication Date: 2014-05-07
RESONAC CORPORATION
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] On the other hand, with the recent improvement in performance and fuel consumption of internal combustion engines for automobiles, the valve guide is further exposed to high temperature and high contact pressure during the operation of the internal combustion engine, and in addition to the recent improvement in environmental awareness. The amount of lubricating oil supplied to the valve guide and the valve stem boundary surface tends to decrease, resulting in a more severe sliding environment for the valve guide

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
  • Sintered material for valve guides and production methods therefor
  • Sintered material for valve guides and production methods therefor
  • Sintered material for valve guides and production methods therefor

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] [Method for producing the first sintered valve guide material]

[0041] In order to suppress the diffusion of Cu in the above-mentioned iron matrix, a matrix with uneven Cu concentration is formed where the part with high Cu concentration and the part with low Cu concentration coexist, and the dispersed plate-shaped iron carbide (Fe 3 In the case of the sintered valve guide material of C), the first method of producing the sintered valve guide material of the present invention is characterized in that, as the raw material powder, when a mixed powder obtained by adding copper powder and graphite powder to iron powder is used, The heating temperature during sintering (sintering temperature) is set to be lower than the melting point of Cu (1085° C.), and sintering is performed using only Cu diffusion into the iron matrix as solid phase diffusion without generating a Cu liquid phase.

[0042] At this time, if the raw material powder is provided with graphite powder in which...

no. 1 Embodiment

[0061] Prepare iron powder, copper powder and graphite powder, add copper powder and the graphite powder of 2% mass as shown in table 1 in iron powder, mix and prepare raw material powder, the raw material powder that will make is added under the molding pressure of 650MPa Compression, forming a circular tubular green compact with an outer diameter of 11mm, an inner diameter of 6mm, and a length of 40mm (for wear tests) and a round tubular green compact with an outer diameter of 18mm, inner diameter of 10mm, and a length of 10mm (for radial compressive strength tests) , sintering the obtained circular tubular green compact in an ammonia decomposition atmosphere at a heating temperature of 1000°C, setting the holding time at 30 minutes, and then cooling to prepare sintered test samples of test samples 01-10 . In addition, when cooling from heating temperature to normal temperature, the cooling rate in the temperature range from 850 degreeC to 600 degreeC was 10 degreeC / min.

...

no. 2 Embodiment

[0077] Using the iron powder, copper powder and graphite powder used in the first embodiment, add 2% mass of copper powder, graphite powder in the ratio shown in Table 2 to the iron powder, mix and prepare the raw material powder, and prepare the raw material The powder was shaped and sintered under the same conditions as in the first embodiment to prepare test samples with test sample numbers 12-17. The overall composition of these test products is shown in Table 2 together. In addition, with respect to these test samples, an abrasion test and a radial compression test were performed in the same manner as in the first example, and the area ratio of the iron carbide phase and the area ratio of the copper phase were measured. The results are shown in Table 2 together. It should be noted that, as an example in which the graphite powder addition amount is 2% by mass, the values ​​of the test sample whose test sample number is 05 in the first embodiment are shown in Table 2 toget...

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
compressive strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to View More

Abstract

A sintered material for valve guides consists of, by mass %, 1.3 to 3 % of C, 1 to 4 % of Cu, and the balance of Fe and inevitable impurities. The sintered material exhibits a metallic structure made of pores and a matrix, the matrix is a mixed structure of a pearlite phase, a ferrite phase, an iron carbide phase, and a copper phase, and a part of the pores includes graphite that is dispersed therein. The iron carbide phase is dispersed at 3 to 25 % by area ratio and the copper phase is dispersed at 0.5 to 3.5 % by area ratio with respect to a cross section of the metallic structure, respectively.

Description

technical field [0001] The invention relates to a sintered valve guide material used in an internal combustion engine and a preparation method thereof, in particular to a technology for further improving wear resistance while controlling preparation cost. Background technique [0002] The valve guide used in the internal combustion engine is a circular tubular member, and the rod (rod portion) of the intake valve for sucking in the fuel mixture gas discharged to the combustion chamber of the internal combustion engine and the exhaust valve for discharging the combustion gas from the combustion chamber is supported on its inner surface. It is necessary to maintain its own wear resistance and a smooth sliding state that does not wear the valve stem for a long time. As such valve guides, cast iron parts have been used until now, but sintered alloys can obtain a special metal structure alloy that cannot be obtained from molten materials, and impart wear resistance. If a mold is ...

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): C22C38/16C22C37/00C22C33/02
CPCB22F3/1028B22F3/11C22C9/02C22C13/00F01L3/02C22C38/008B22F5/008C22C33/0264C22C38/16C22C9/00
Inventor 藤塚裕树河田英昭
Owner RESONAC CORPORATION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com