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A special coating for lost foam casting and its preparation method

A technology of lost foam casting and coating, which is applied to casting molding equipment, coatings, molds, etc., to achieve the effect of strengthening adhesion, low price, and reducing post-processing costs

Active Publication Date: 2021-04-23
江西时利和智控节能有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to reduce the dust pollution in the coating preparation process, reduce the pores of the casting and alleviate the problem of carbon increase in the casting

Method used

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Examples

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preparation example Construction

[0026] The invention provides a method for preparing a special coating for lost foam casting, comprising the following steps:

[0027] (1) Preparation of raw materials: use quartz stone as aggregate, and weigh 450-500 parts of quartz stone, 10-20 parts of white latex, 10-15 parts of sodium carboxymethyl cellulose, 20-30 parts of sodium bentonite, cassava 10-15 parts of modified starch, 10-15 parts of boric acid, 10-15 parts of iron oxide red, 1-2 parts of sodium carbonate, 400-500 parts of water;

[0028] (2) Feeding: adding the raw materials into the metal drum, putting metal balls in the metal drum, and closing the metal drum;

[0029] (3) Paint preparation: drive the metal drum to rotate, make the metal balls grind the aggregate, and fully stir the raw materials to obtain a uniform paint;

[0030] (4) Paint storage: After grinding, transfer the paint to the coating and hanging pool.

[0031] In a preferred embodiment of the present invention, in order to avoid a large amo...

Embodiment 1

[0034] The preparation method of the special coating for lost foam casting that this preferred embodiment adopts comprises the following steps:

[0035] (1) Preparation of raw materials: use large-grained quartz stones with a particle size of 4 to 32 mm as aggregates, and weigh 450 parts of quartz stones, 15 parts of white latex, 10 parts of sodium carboxymethyl cellulose, and 25 parts of sodium bentonite. 10 parts of cassava modified starch, 10 parts of boric acid, 10 parts of iron oxide red, 1 part of sodium carbonate, 500 parts of water;

[0036] (2) Feeding: Add raw materials to the metal drum, and put metal balls with a diameter of 100mm in the metal drum. The total volume of the metal balls is 100% of the volume of the quartz stone, and the metal drum is closed;

[0037] (3) Coating preparation: drive the metal drum to rotate continuously at a speed of 50-60r / min for 20 hours, make the metal ball grind the aggregate, and fully stir the raw materials to obtain a uniform c...

Embodiment 2

[0041] The preparation method of the special coating for lost foam casting that this preferred embodiment adopts comprises the following steps:

[0042] (1) Preparation of raw materials: use large-grained quartz stones with a particle size of 4 to 32 mm as aggregates, and weigh 500 parts of quartz stones, 20 parts of white latex, 15 parts of sodium carboxymethyl cellulose, and 30 parts of sodium bentonite. 15 parts of cassava modified starch, 15 parts of boric acid, 10 parts of iron oxide red, 1.5 parts of sodium carbonate, 450 parts of water;

[0043] (2) Feeding: Add raw materials to the metal drum, and put metal balls with a diameter of 100mm in the metal drum. The total volume of the metal balls is 70% of the volume of the quartz stone, and the metal drum is closed;

[0044] (3) Coating preparation: drive the metal drum to rotate continuously at a speed of 60-70r / min for 24 hours to make the metal ball grind the aggregate and fully stir the raw materials to obtain a unifor...

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Abstract

The invention discloses a preparation method of a special coating for lost foam casting, which relates to the field of coatings for lost foam casting, and comprises the following steps: preparing raw materials, grinding aggregates and fully stirring the raw materials to obtain a coating with uniform texture. The special coating for lost foam casting prepared by the present invention has a density of 1.4 to 1.6 g / cm 3 , Baume degree is 60~66°Bé. The invention adopts large-grained quartz stone as the aggregate, and the dust in the production environment is small and the price is low. And by grinding large-grained quartz stone, the size of the aggregate is quite different, and the shell mold prepared by the obtained coating has good air permeability. Under the condition of negative pressure casting, it can effectively reduce the pore defects of the casting and reduce the problem of carburization. The ground and refined quartz stone strengthens the cohesiveness of the coating itself, which is beneficial to reduce sand sticking in castings and reduce production costs.

Description

technical field [0001] The invention relates to the field of lost foam casting coatings, in particular to a special coating for lost foam casting and a preparation method thereof. Background technique [0002] Lost Foam Casting is a foam model made in proportion to the size of the casting. The surface of the foam model is painted with a special refractory paint for lost foam. After the paint is dried, the model is buried in dry sand for vibration and molding. A new casting method in which high-temperature molten metal is poured, the foam model is vaporized, and the liquid metal occupies the position of the model and is cooled and solidified to form a casting. This method is known as the green casting technology of the 21st century because of its advantages such as no need to take molds, no parting surface, high dimensional accuracy of castings, and less machining allowance. [0003] The main performance indicators of foundry coatings include coatability, air permeability, f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 栾新华潘敦童容英
Owner 江西时利和智控节能有限公司
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