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

Wire for piston rings

A piston ring and quality technology, applied in the field of steel wire, can solve problems such as wire breakage, and achieve the effect of small width deviation, excellent processability, and appropriate Vickers hardness

Inactive Publication Date: 2015-06-03
TOKUSEN IND CO LTD +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thread also sometimes breaks when winding

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
  • Wire for piston rings
  • Wire for piston rings
  • Wire for piston rings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A steel ingot is obtained from a molten metal whose components have been prepared. The steel ingot is hot-rolled, annealed, cold-drawn, and cold-rolled to obtain a plain wire. Quenching is performed on the plain wire. The quenching temperature is 1070°C. The wire of Example 1 was obtained by tempering this plain wire. The tempering temperature is 664°C. Observing the cross-section of this wire, as a result, the area ratio P2 was 8.45%, and the density D was 221 pieces / 1000μm 2 . The Vickers hardness Hv of this wire was 421. The cross-sectional shape of the line is shown in Figure 4 .

Embodiment 2-6 and comparative example 1-2

[0070] The lines of Examples 2-6 and Comparative Examples 1-2 were obtained in the same manner as in Example 1 except that the tempering temperature was set as shown in Table 2 and Table 3 below.

Embodiment 7-10 and comparative example 3-4

[0072] Except having set the quantity of Mo as shown in following Table 4, it carried out similarly to Example 1, and obtained the lines of Examples 7-10 and Comparative Examples 3-4.

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
Vickers hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

Provided is a wire for piston rings with which variation in the width of the piston ring gap is reduced, workability during coiling is excellent, and which can be manufactured at low cost. This wire for piston rings is obtained from steel comprising 0.50 mass% to 0.80 mass% of C, 1.00 mass% or less of Si, 1.00 mass% or less of Mn, 11.0 mass% to 14.0 mass% of Cr, 0.20 mass% to 2.0 mass% of Mo, and unavoidable impurities. The area ratio of carbide particles with an equivalent circle diameter of 0.2 µm to 5 µm is 10% or less in the structure of a transverse cross-section, and the Vickers hardness is 350 to 450. The wire is manufactured by undergoing hardening and tempering and the tempering temperature is 645°C or more.

Description

technical field [0001] The present invention relates to wires for pistons of internal combustion engines, compressors and the like. Specifically, the present invention relates to steel wires. Background technique [0002] Conventionally, piston rings made of cast iron have been used in internal combustion engines such as automobile engines. In recent years, piston rings made of steel have become popular. Steel piston rings are excellent in strength. Piston rings made of steel can be produced easily. [0003] We use thread for production of steel piston ring. In the production of this line, a steel ingot having a prescribed composition is first obtained. The steel ingot is subjected to hot rolling, annealing, cold drawing, cold rolling, etc. to obtain a plain wire. Quenching and tempering were performed on this plain wire to obtain a wire for piston rings. [0004] The wire is subjected to bending processing. This bending process is called winding. The thread is cut ...

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 Applications(China)
IPC IPC(8): C22C38/00C21D9/52C22C38/22C22C38/24F16J9/26
CPCC21D8/065C21D9/52C22C38/001C22C38/02C22C38/04C22C38/22C22C38/24C21D2211/004C22C38/00C21D1/18C21D6/002C21D6/005C21D6/008C21D9/525F16J9/26
Inventor 加门良一水野幸隆
Owner TOKUSEN IND CO LTD