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Laser sintered sand and its preparation method, sand core and its preparation method

A laser sintering and sand core technology, applied in the direction of cores, manufacturing tools, casting and molding equipment, etc., can solve the problem of low sand core strength, and achieve the effects of reducing manual intervention, high sintering initial strength, and improving molding efficiency.

Active Publication Date: 2012-02-01
安徽隆源成型科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The invention aims at the shortage of low strength of the sand core prepared by using the existing laser sintered sand, and provides a laser sintered sand and its preparation method, and a sand core and its preparation method

Method used

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  • Laser sintered sand and its preparation method, sand core and its preparation method
  • Laser sintered sand and its preparation method, sand core and its preparation method
  • Laser sintered sand and its preparation method, sand core and its preparation method

Examples

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preparation example Construction

[0044] image 3 It is a schematic flow chart of the preparation method of laser sintered sand of the present invention. Such as image 3 Shown, the preparation method of described laser sintering sand comprises the following steps:

[0045] Step 101, coating thermosetting resin and additives on the surface of the first type of raw sand to form the first component A, the first type of raw sand is silica sand, zircon sand, enstatite sand, corundum sand, limestone sand, magnesium sand sand, mullite sand, chromite sand or carbon grain sand.

[0046] The thermosetting resin and additives in the first component A prepared in step 101 are coated on the surface of the first type of raw sand. Coating the thermosetting resin and additives on the surface of the first type of raw sand is thermal coating. In this embodiment, the thermosetting resin is a thermosetting phenolic resin.

[0047] The additives include a curing agent, a lubricant and a coupling agent. The step 101 includes t...

Embodiment 1

[0068] Preparation of the first component A: First, heat 2,000 parts of scrubbed silica sand with specifications of 70 mesh to 140 mesh, AFS fineness of 50 to 60, and silica sand value of 85 to 180°C, then add it to the rotor sand mixer and stir at high speed ; Secondly, after adding 1 part of r-aminopropyltriethoxysilane, stir for 10 seconds; then, add 40 parts of high-strength low-gas phenolic resin (PF1901, Jinan Shengquan Company) with a softening point of 85 ° C and stir for 60 seconds to 90 seconds; then, add 8 parts of 50% aqueous solution of hexamethylenetetramine and continue stirring for 60 seconds; then, add 2 parts of calcium stearate and continue stirring for 30 seconds to 60 seconds; finally, when the mixture is cooled to the resin After softening point, the mixture is broken up by stirring, sanded and sieved.

[0069] Preparation of the second component B: First, heat 110 parts of montan wax with a melting point of 80°C to 100°C to fully melt, then add 45 parts ...

Embodiment 2

[0074] The preparation of the first component A is the same as in Example 1.

[0075] Preparation of the second component B: First, heat 2000 parts of the same raw sand as in Example 1 to 240°C and add it to the sand mixer; secondly, quickly add 1 part of r-aminopropyltriethoxysilane Coupling agent, stir for about 10 seconds; then, add 120 grams of low-melting point ternary copolymerized nylon powder with a melting point between 90°C and 100°C, and stir for 150 seconds; finally, add 40 parts of the same as in Example 1 at 100°C in advance The fully melted montan wax, polyethylene-ethyl acetate copolymer resin and terpene resin are mixed and melted and stirred for 120 seconds. After the mixture is fully cooled, the mixture is broken up, sanded and sieved.

[0076] The mixing ratio of the first component A and the second component B and the laser sintering process are the same as in the first embodiment.

[0077] The secondary curing process is the same as in Embodiment 1.

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Abstract

The invention relates to a laser sintered sand and a preparation method thereof, a sand core and a preparation method thereof. The laser sintered sand is composed of a uniformly mixed first component and a second component, the first component is composed of the first type of raw sand with an angle coefficient less than 1.3, a thermosetting resin and additives, wherein the thermosetting resin and The additive is coated on the surface of the first type of raw sand; the second component is composed of the second type of raw sand with an angle coefficient less than 1.1, thermoplastic materials and additives, wherein the thermoplastic material and the additive are coated on the second type of raw sand Sand the surface. The laser sintering sand of the present invention does not need to add auxiliary support structures in the process of laser sintering, thereby improving the molding efficiency and reducing manual intervention; any complex sand core can be manufactured without a mold, and the sand core has a high initial strength of sintering, and It can meet the requirements of the metal casting process on the thermal strength and gas generation of the sand core.

Description

technical field [0001] The invention relates to a laser sintered sand and a preparation method thereof, a sand core and a preparation method thereof, in particular to a laser sintered sand without a mould, a preparation method thereof, a sand core and a preparation method thereof. Background technique [0002] For the production of complex sand castings, the manufacture of sand cores, also known as sand molds, is an essential link. The traditional sand core production is completed by manufacturing molds, core shooting and core assembly. The advantage of using mold production is that once the trial production is qualified, it can be put into mass production. However, for complex castings with small batches or very short delivery times, the manufacturing cycle and cost of molds become prominent problems. In the fierce environment of modern product competition, the requirements for the development cycle of new products are getting shorter and shorter, while the demand for per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/00B22C1/02B22C1/22B22C9/10C08L61/06C08L23/08C08L33/02C08L77/00C08L71/08
Inventor 冯涛孙建民赵红柳国峰
Owner 安徽隆源成型科技有限公司
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