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High-strength high-wear-resistant bainite cast steel used for block cast middle groove, and preparation technology thereof

A preparation process and high-strength technology, applied in the direction of manufacturing tools, casting equipment, and process efficiency improvement, can solve the problems of changing the wear resistance of grooves, increasing production costs, and high costs, preventing fracture failure, and improving use. Longevity and the effect of reducing the cost of fully mechanized mining

Active Publication Date: 2019-01-22
JIKAI HEBEI MECHATRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, although domestic manufacturers have many methods to improve the wear resistance of the middle groove, none of them can fundamentally improve the wear resistance of the middle groove. The method of using materials to increase the wear resistance of the groove side only changes the wear resistance of the groove side, and will cause many problems such as interference with scraper transportation and processing difficulties. Layer and the method of welding wear-resistant layer on the surface of the middle plate to improve the wear resistance of the middle plate and the bottom plate of the middle groove will not only increase the running resistance of the middle groove, but also increase the production cost, and the materials of each part are different. The difference in shrinkage may easily lead to open welding of the middle plate, falling of the back cover plate, damage of the tongue plate, etc. The method of replacing the middle plate and the bottom plate with a plate with high wear resistance to improve the service life of the middle tank is not only costly, but also Moreover, due to the different materials, the wear resistance of each part is inconsistent, and the thinning of the upper edge of the groove is easy to cause floating chains, which endangers the safe operation of miners.

Method used

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  • High-strength high-wear-resistant bainite cast steel used for block cast middle groove, and preparation technology thereof
  • High-strength high-wear-resistant bainite cast steel used for block cast middle groove, and preparation technology thereof
  • High-strength high-wear-resistant bainite cast steel used for block cast middle groove, and preparation technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] like figure 1 As shown, a high-strength and high-wear-resistant bainite cast steel for the entire casting middle tank and its preparation process, including raw materials, lost foam preparation - raw material hot melting - lost foam casting - diffusion annealing pretreatment - cast steel salt bath quenching , Tempering—the process steps of cast steel quality inspection, the specific steps are as follows:

[0047] (1) Preparation of raw materials and lost foam: prepare different raw materials according to a certain ratio, and customize a suitable lost foam corresponding to the middle groove to be produced;

[0048] (2) Hot melting of raw materials: Put the raw materials into the high-temperature furnace to heat and melt the raw materials;

[0049] (3) The lost foam casting steps are as follows:

[0050] ① Put the lost foam into the lost foam sand box;

[0051] ②Fill a small amount of molding sand around the bottom of the lost foam to locate the position of the lost fo...

Embodiment 2

[0063] like Figure 2-4 As shown, in the lost foam sand box treasure sand box body 1 described in step (3), the inside and outside surface of the sand box body 1 is provided with a gauze frame 3 , and the inside of the gauze frame 3 is provided with a gauze 4 The outer surface of the front end of the main body of the sand box 1 is provided with a connecting block 5, the outer surface of the front end of the connecting block 5 is provided with a handle 6, and the outer surface of one side of the main body of the sand box 1 is provided with a movable plate 7. An inclined block 9 is provided on one side of the outer surface of the main body 1 of the flask near the movable plate 7 , and a pulling rod 10 is provided on the outer surface of the movable plate 7 .

[0064] A further improvement of the present invention is that: the salt bath furnace in step 5 includes a furnace shell 11, the inner and outer surface of the furnace shell 11 is provided with a heat insulating layer 12, a...

Embodiment 3

[0071] like Figure 5-7 As shown, the outer surface of the lower end of the chimney 15 and the furnace roof 14 are flexibly connected, the spacer 17 is fixedly connected to the chimney 15, and the spacer 18 and the roof 14 are connected to each other. For the fixed connection, the spacer frame 18 and the spacer block 17 are connected flexibly.

[0072] A further improvement of the present invention is that: the inside of the furnace inner layer 13 is provided with an electrode rod 19, the electrode rod 19 penetrates the upper surface of the furnace roof 14, and the electrode rod 19 and the furnace roof 14 are fixed There is a certain distance between the lower end of the electrode rod 19 and the outer surface of the lower end of the furnace inner layer 13 .

[0073] The working principle of the carburizing box in this mold processing technology: customize the lost foam corresponding to the middle groove that needs to be manufactured, place the lost foam inside the main body o...

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Abstract

The invention discloses high-strength high-wear-resistant bainite cast steel used for a block cast middle groove, and a preparation technology thereof. The preparation technology comprises the following technical steps: preparing raw materials and evanescent modes, carrying out raw material hot melting, casting the evanescent modes, carrying out diffusion annealing preprocessing, carrying out caststeel salt bath quenching and tempering and detecting cast steel quality. The bainite cast steel used for the middle groove has the characteristics of high strength and high wear-resistant performance, the middle groove is subjected to integral casting forming, and the problem that all positions have inconsistent wear resistance is avoided. When a work surface is turned, maintenance is not required, the current work surface is directly turned to a next work surface, and the coal mining efficiency is improved. Meanwhile, since the materials of different positions are different, so that the effect of new goods are traded for old goods is realized, waste middle groove can be recovered and recast, waste is recycled, and the fully mechanized mining cost of users is greatly lowered, thus realizing an important meaning for the energy and material saving, the circular economy and the sustainable development of coal production.

Description

technical field [0001] The invention relates to the technical field of middle groove production, in particular to a high-strength and high-wear-resistant bainite cast steel for integral casting of a middle groove and a preparation process thereof. Background technique [0002] At present, although domestic manufacturers have many methods to improve the wear resistance of the middle groove, they cannot fundamentally improve the wear resistance of the middle groove. By welding the wear-resistant layer in the middle groove and changing the casting of the groove The method of increasing the wear resistance of the groove by material only changes the wear resistance of the groove, and will cause many problems such as interfering with the transportation of the scraper and processing difficulties. The method of improving the wear resistance of the middle plate and the bottom plate in the middle groove will not only increase the running resistance of the middle groove, but also inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/44C22C38/42C21D6/00C21D1/18C21D1/26B22C9/04
CPCB22C9/046C21D1/18C21D1/26C21D6/004C21D6/005C21D6/008C21D2211/002C22C38/02C22C38/04C22C38/42C22C38/44C22C38/58Y02P10/20
Inventor 赵辉苏怡宁周志彪文艳雷张建军张宏财
Owner JIKAI HEBEI MECHATRONICS TECH CO LTD
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