Method for casting ledges of middle troughs of scraper conveyer by V (vacuum) method

A technology of scraper conveyor and trough side, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of complex structure of the middle trough, inability to cast and shape, and uneven thickness, so as to reduce deformation and achieve accurate dimensions , the effect of less harmful gas

Active Publication Date: 2015-06-17
JIZHONG ENERGY HANDAN MINING GRP TONGFANG COAL MINING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the structure of the middle groove is too complicated, and the thickness varies from place to place, casting the middle groove with the ordinary V method has disadvantages such as large deformation and inability to cast.

Method used

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  • Method for casting ledges of middle troughs of scraper conveyer by V (vacuum) method
  • Method for casting ledges of middle troughs of scraper conveyer by V (vacuum) method
  • Method for casting ledges of middle troughs of scraper conveyer by V (vacuum) method

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Embodiment Construction

[0045] The present invention is described in further detail below by a best embodiment:

[0046] A method for casting the side of a groove in the middle part of a scraper conveyor using the V method, including placing a pattern, covering the pattern with a film and heating and forming, placing a sand box, adding sand and vibrating, covering the film, removing the mold, closing the box, pouring, Shakeout process.

[0047] The material of the side of the middle groove in this embodiment is ZG30MnSiCrNi, wherein the weight percentage of Si is controlled at 0.6-0.8%, the weight percentage of Mn is controlled at 1.1-1.4%, and the weight percentage of Ni is controlled at 0.1-0.2% , the weight percentage of Cr is controlled at 0.2-0.3%, and other components can be controlled according to the national standard; the casting temperature is 1580-1600 °C.

[0048] The sand box is in the form of a combination of upper and lower sand boxes, and 10mm thick steel plates are continuously weld...

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Abstract

The invention discloses a method for casting ledges of middle troughs of a scraper conveyer by the V (vacuum) method. A sand box adopts a vacuum sand box consisting of an upper sand box and a lower sand box which are combined with each other as well as independently-controlled vacuum chambers; a sucker with densely-arranged air suction holes is arranged on a concave-convex part of each model; a covering film on each model is required to be compacted; the surface of an EV film is coated with a zircon power fireproof coating which is 0.9-1.1 mm in thickness; the ramming time is 5-20 seconds; air exhaust holes are also formed at dry sand and pouring gates; the vacuum degree is always kept at 0.04-0.06 MPa in processes of rapping, assembling and pouring; the pouring is implemented by an inclined pouring manner within 60-70 seconds; after the pouring is finished, the vacuum degree is adjusted to be 0.02 MPa and is kept for 10-15 minutes; then negative pressure can be withdrawn to wait for falling of sand for box removal. By the technical measures, the ledges of the middle troughs with high quality and high yield can be cast by the V method.

Description

technical field [0001] The invention relates to a casting method, in particular to a method for casting a groove in the middle of a scraper conveyor using a V method. Background technique [0002] V-method casting is also known as negative pressure casting, which is named after the prefix "V" of the English word Vacuum (vacuum). Its biggest advantage over traditional sand casting is that it does not use adhesives. V-method casting uses a plastic film to seal the sand box, the air in the mold is drawn out by a vacuum pumping system, and the pressure difference between the inside and outside of the mold makes the dry sand dense to form the required cavity. After setting the core, closing the box, vacuuming, pouring, solidifying, and then releasing the negative pressure, the molding sand collapses and the casting is obtained. [0003] The process of V method molding is: [0004] 1. Place the pattern: put the pattern on the template, which has a large number of ventilation ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/03B22C9/22
Inventor 齐会昌郭洪涛王信平孟德义胡术祥孟祥敏王志娜马驰翟连英杨玉生刘跃合苗秀海周顺利宋延辉
Owner JIZHONG ENERGY HANDAN MINING GRP TONGFANG COAL MINING MACHINERY
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