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Bainite nodular cast iron slide block and manufacture method thereof

A technology of bainitic nodular graphite and nodular cast iron, which is applied in the manufacturing field of the slider, can solve the problems of complex machining and heat treatment process, reduced service life of the workpiece, and high cost of the finished slider, so as to achieve good machinability, durability Good effect on knife life, anti-scratch performance and wear resistance

Inactive Publication Date: 2012-06-13
区文波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical requirements are not met, resulting in a reduction in the service life of the workpiece
In addition, the steel used for steel sliders is expensive, and the blank manufacturing, machining and heat treatment processes are complicated, resulting in high cost of finished sliders.

Method used

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  • Bainite nodular cast iron slide block and manufacture method thereof
  • Bainite nodular cast iron slide block and manufacture method thereof
  • Bainite nodular cast iron slide block and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: the wall thickness of slider is 10mm, selects the chemical composition of copper-molybdenum ductile iron to be: carbon 3.6%, silicon 2.8%, manganese 0.40%, phosphorus 0.06%, sulfur 0.05%, magnesium 0.04%, rare earth 0.035%, copper 0.18%, molybdenum 0.10%, and the rest is iron. The as-cast metallographic structure is pearlite matrix + 20-30% ferrite + 3-5% carbide. Spheroidization level 1-2, spheroidal ink size 5-6. Hardness 170 ~ 241HB. The manufacturing method includes: forming cavity molding of the slider, smelting and pouring of copper-molybdenum ductile iron, mechanical processing of the slider, bainitic heat treatment and the like. Bainite treatment parameters: first heat the slider at a temperature of 860-900°C for austenitization, then oil-cool, keep it at a temperature of 240-290°C for 45-60 minutes, and then temper at 280-320°C 2 to 4 hours.

Embodiment 2

[0035] Embodiment 2: the wall thickness of slide block is 25mm, selects the chemical composition of copper-molybdenum ductile iron to be: carbon 3.8%, sulfur 2.35%, manganese 0.35%, phosphorus 0.07%, sulfur 0.06%, magnesium 0.035%, rare earth 0.042%, copper 0.46%, molybdenum 0.32%, and the rest is iron. The as-cast metallographic structure is sorbite pearlite matrix + 10-20% broken ferrite + 5-10% carbide. Spheroidization level 1, graphite size 2-3. Hardness 328 ~ 353HB. Due to the high hardness of the formed slider, it is difficult to cut and process, and annealing is required to reduce its hardness. Annealing process: 600~620℃, holding time 2~4 hours, hardness ≤28HRC. The slider is then machined and heat treated for bainitizing. Bainite treatment parameters: first heat the slider at a temperature of 850-870°C for austenitization, then oil-cool, keep it at a temperature of 240-260°C for 45-60 minutes, and then temper at 280-300°C 2 to 4 hours.

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Abstract

The invention discloses bainite nodular cast iron slide block and manufacture method thereof. The slide block is manufactured by copper-molybdenum nodular cast iron, and bainite is used as a matrix. The manufacture method comprises the following steps of: firstly, manufacturing a forming cavity of the slide block; then pouring molten copper-molybdenum nodular cast iron into the forming cavity; next, machining according to the size of the slide block; and finally, carrying out bainite heat treatment on the slide block. The bainite nodular cast iron slide block is manufactured by adopting the copper-molybdenum nodular cast iron, and the cost of a copper-molybdenum nodular cast iron blank is 40-60 percent lower than that of a steel blank, and the matrix is the bainite, thus the scratch resistance and the wear resistance are good. The slide block has good vibration absorption property so as to ensure that the operation state of a guide rail pair is more stable, and the slide block also has good machining property so as to prolong the service life of cutters, improve the cutting speed and reduce the machining cost. From casting and heat treatment to processing a finished product, the whole process has short production period and low energy consumption, and the weight of the slide block is reduced by 5-8 percent so as to be beneficial to reducing the production cost.

Description

technical field [0001] The invention relates to a rolling guide rail auxiliary slider; the invention also relates to a manufacturing method of the slider. Background technique [0002] At present, the materials used in domestic and foreign rolling guide rail auxiliary sliders are generally formed by high-quality low-alloy structural steel die forging or hot rolling or cold drawing. In order to ensure wear resistance, when manufacturing sliders, steel sliders are quenched or carburized. However, this type of material has poor hardenability, and the depth of the hardened layer after quenching is uneven, especially for sliders with large dimensions. For the same slider, the part with thinner wall thickness has a deeper effective hardened layer depth; the part with thicker wall thickness has a shallower effective hardened layer depth. The technical requirements are not met, resulting in a reduction in the service life of the workpiece. In addition, the steel materials used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C21D5/00
Inventor 区文波
Owner 区文波
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