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

Precoated sand shell mold casting method

A technology of shell casting and coated sand, which is applied in the direction of casting molding equipment, molds, cores, etc., can solve the problems of insufficient durability, reduce gas generation, increase durability and service life, and increase toughness degree of effect

Pending Publication Date: 2022-03-01
湖北谷城东华科技有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the casting process of common coated sand shell products, air holes will be generated inside, which will cause the problem of insufficient durability

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of coated sand shell mold casting method, the coated sand shell mold casting method comprises the following steps:

[0029] S1: first carry out the configuration of coated sand, weigh 800 parts of zircon sand or chromite sand, 300 parts of solid phenolic resin, 60 parts of hexamethylenetetramine, 20 parts of high temperature resistant additive, 20 parts of ultra-short glass fiber material, 20 parts of oil shale powder for standby; in step S1, SiO2>90% and mud content ≤0.2% are required in zircon sand or chromite sand; particle size distribution should adopt 3-5 sieve dispersion; internal AFS fineness is 50 ~65; Choose round silica sand in zircon sand or chromite sand; Angle factor should be less than 1.3 in zircon sand or chromite sand; PH value is less than 7; In step S1, the hot plate method polymerization speed of solid phenolic resin is set to 25~27s; softening point of solid phenolic resin: 90~105℃; fluidity of solid phenolic resin: 60~110mm; free phenol con...

Embodiment 2

[0040] A kind of coated sand shell mold casting method, the coated sand shell mold casting method comprises the following steps:

[0041]S1: First carry out the configuration of coated sand, weigh 1000 parts of zircon sand or chromite sand, 500 parts of solid phenolic resin, 100 parts of hexamethylenetetramine, 50 parts of high temperature resistant additive, and 20 parts of ultra-short glass fiber material , 20 parts of oil shale powder for subsequent use; in step S1, SiO2>90% is required in zircon sand or chromite sand, mud content≤0.2%; particle size distribution should adopt 3~5 sieve dispersion; internal AFS fineness is 50~65; choose rounded silica sand in zircon sand or chromite sand; angle factor in zircon sand or chromite sand should be less than 1.3; pH value is less than 7; in step S1, the hot plate method polymerization speed of solid phenolic resin 25~27s; softening point of solid phenolic resin: 90~105℃; fluidity of solid phenolic resin: 60~110mm; free phenol cont...

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
Softening pointaaaaaaaaaa
Fluidityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a precoated sand shell mold casting method. The precoated sand shell mold casting method comprises the steps of precoated sand preparation, mold design, solid core preparation, precoated sand shell mold preparation, pouring and the like. When the mold is designed, the thickness of the whole shell mold is consistent as much as possible, and an exhaust channel is reserved at the position of a sand mold core head, so that gas in a sand core after mold closing can be exhausted outwards along the exhaust channel, and sand at all positions can be completely cured, does not carry raw sand and is not over-cured under the same molding parameters of the produced shell mold; according to the precoated sand and the preparation method thereof, the precoated sand is added with the ultra-short glass fiber material during preparation, so that the toughness of the product is improved, and the phenomenon that the precoated sand is difficult to deform in the continuous use process is avoided; and the precoated sand is easy to damage, so that the durability and the service life of the product are improved.

Description

technical field [0001] The invention belongs to the technical field of metal casting, in particular to a film-coated sand shell mold casting method. Background technique [0002] Coated sand fingers. Molding sand or core sand whose surface is covered with a layer of solid resin film before molding. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand, and the ethanol volatilizes to obtain coated sand; Preheat the sand to a certain temperature, add resin to melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. For steel castings and iron castings. [0003] However, during the casting process of common coated sand shell products, air holes will be generated inside, which will cause the problem of insufficient durabilit...

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
IPC IPC(8): B22C1/00B22C1/02B22C1/22B22C9/02B22C15/24
CPCB22C1/00B22C1/02B22C1/2253B22C15/24B22C9/02
Inventor 王雨鸣
Owner 湖北谷城东华科技有限公司