CN102389943A - Manufacturing method of thin shell - Google Patents

Abstract

The invention discloses a manufacturing method of a thin shell. With water glass as a paint binder, the method employs a manual shell making operation of hardening with crystal aluminum chloride and filters paint into a paint bucket after stirring it well. In the method, the processes of coating, sand lining, hardening, and air drying go repeatedly, with 3.5 shell layers manufactured and 40-60min of air drying for each layer. For technologies before changing, a small shell is usually made into 6 layers and a large shell is made into 7 layers. Thus, the method of the invention not only reduces the capital investment of raw materials, but also enhances the work efficiency.

Description

A kind of preparation method of slim shell

Technical field

The invention belongs to the castings production technical field, be specifically related to a kind of preparation method of slim shell.

Background technology

The shell casting is the casting method that forms the shell casting mold with the compound of silica sand or zircon sand and resin or resin coated sand.Make the molding sand quantity that shell casting mold or shell core can significantly reduce use with resin sand, the foundry goods clear-cut of acquisition, any surface finish, size is accurate, can be without machining or only processing on a small quantity.Therefore shell moulded casting is specially adapted to the foundry goods of the various alloys that production lot is big, dimension precision requirement is high, wall is thin and complex-shaped.And present shell need be done the 6-7 layer, and big part more will be done the 7--8 layer, consume material not only, and waste time and energy.

Summary of the invention

The objective of the invention is to avoid above-mentioned weak point of the prior art, and a kind of preparation method of the slim shell that reduces cost, effectively increases work efficiency is provided.

Realize that the technical scheme that the object of the invention adopted is: a kind of preparation method of slim shell, said method comprises the steps:

A, elder generation's preparation superficial layer coating are measured waterglass proportion with densimeter, guarantee it at 1.28-1.30, modulus 3-3.4; In charging basket, mix up waterglass proportion earlier, add 270 order silica flours then, stir while adding, the powder liquor ratio is controlled at 1:1.10-1:1.25; Coating stirred 1 hour, measured viscosity with flow cup, and if viscosity is not in the time of 8-20 ℃, in the time of 40-70s and 20-35 ℃; In the scope of 25-35s, be adjusted to acceptability limit, coating leaves standstill more than 2--4 hour and just can use after stirring; Repetition measurement dope viscosity before the dip-coating material, and be adjusted to acceptability limit immerses module then and moves up and down in the coating and rotate, and mentions the back and drips and remove unnecessary coating; And the rotation module, make coating cover the module surface, be coated with bubble then with the brush coating and brush away bubble if having to lack;

B, stucco: the 70 order quartz sands of in sander, packing into, start sander, in the floating layer of sand of module insertion with first-class coating, rotate module during stucco;

C, the module that will spread sand immersed in the ammonium chloride sclerosis pond sclerosis 20--25 minute, took out module then with clear water flush away hardening bath, hung on the support air-dry 40--60 minute;

D, configuration transition zone coating; Measure dope viscosity with flow cup; Adjusting after the viscosity module with drying immerses in the coating and is coated with extension; Sprinkling 20-40 purpose high alumina sand, hardened 40-50 minute in the aluminium chloride pond of putting into pH value 1.5--2.5, proportion >=1.18, took out to be suspended to air-dry room-dry 40-60 minutes after module is washed.

Since the present invention with waterglass as the paint adhesion agent, hand-manipulated with the system shell of crystal aluminum chloride sclerosis, be filled in the paint can after coating fully stirred; Go round and begin again according to coating, extension sand, sclerosis, air-dry operation, its system shell number is 3.5 layers, and every layer air-dry time is 40-60 minutes; Compare like this before the technology change, general smallclothes are done 6 layers, and big part is done 7 layers; Not only reduce raw-material fund input, also improved operating efficiency.

The specific embodiment

Through specific embodiment, further specify advantage of the present invention below:

Embodiment 1

Preparation superficial layer coating is measured waterglass proportion 1.28, modulus 3.1 with densimeter earlier.In charging basket, mix up waterglass proportion earlier, add 270 order silica flours then, stir while adding, the powder liquor ratio is controlled at 1:1.10; Coating fully stirred 1 hour, measured viscosity with flow cup, and if viscosity is not in the time of 8-20 ℃, in the time of 40-70s and 20-35 ℃; In the scope of 25-35S, be adjusted to acceptability limit, coating leaves standstill more than 2.5 hours and just can use after stirring; Repetition measurement dope viscosity before the dip-coating material, and be adjusted to acceptability limit immerses module then and moves up and down in the coating and rotate, and mentions the back and drips and remove unnecessary coating; And rationally rotate module, and make coating can cover the module surface equably, be coated with bubble then with the brush coating and brush away bubble if having to lack; Stucco: the 70 order quartz sands of in sander, packing into, start sander, in the floating layer of sand of module insertion with first-class coating, rotate module during stucco, make stucco even, do not have to leak and spread, do not have accumulation; The module that has spread sand was immersed in the ammonium chloride sclerosis pond sclerosis 22 minutes, take out module then, hang on the support air-dry 45 minutes with clear water flush away hardening bath; Configuration transition zone coating; Measure dope viscosity with flow cup; Adjusting after the viscosity module with drying immerses to be coated with in the coating and hangs evenly; Sprinkling 28 purpose high alumina sands, hardened 45 minutes in the aluminium chloride pond of putting into pH value 1.5--2.5, proportion >=1.18, took out to be suspended to air-dry room-dry 45 minutes after module is washed.

Embodiment 2

Preparation superficial layer coating is measured waterglass proportion 1.29, modulus 3.3 with densimeter earlier; In charging basket, mix up waterglass proportion earlier, add 270 order silica flours then, stir while adding; The powder liquor ratio is controlled at 1:1.20, and coating fully stirred 1 hour, measured viscosity with flow cup; If viscosity is in the time of 8-20 ℃, 40-70s; In the time of 20-35 ℃, in the scope of 25-35S, be adjusted to acceptability limit; Coating leaves standstill more than 3 hours and just can use after stirring, repetition measurement dope viscosity before the dip-coating material; And be adjusted to acceptability limit, and then module is immersed and move up and down in the coating and rotate, mention the back and drip and remove unnecessary coating; And rationally rotate module, and make coating can cover the module surface equably, be coated with bubble then with the brush coating and brush away bubble if having to lack; Stucco: the 70 order quartz sands of in sander, packing into, start sander, in the floating layer of sand of module insertion with first-class coating, rotate module during stucco, make stucco even, do not have to leak and spread, do not have accumulation; The module that has spread sand was immersed in the ammonium chloride sclerosis pond sclerosis 24 minutes, take out module then, hang on the support air-dry 50 minutes with clear water flush away hardening bath; Configuration transition zone coating; Measure dope viscosity with flow cup; Adjusting after the viscosity module with drying immerses to be coated with in the coating and hangs evenly; Sprinkling 35 purpose high alumina sands, hardened 50 minutes in the aluminium chloride pond of putting into pH value 1.5--2.5, proportion >=1.18, took out to be suspended to air-dry room-dry 50 minutes after module is washed.

Claims (1)

1. the preparation method of a slim shell is characterized in that said method comprises the steps:

A, elder generation's preparation superficial layer coating are measured waterglass proportion with densimeter, guarantee it at 1.28-1.30, modulus 3-3.4; In charging basket, mix up waterglass proportion earlier, add 270 order silica flours then, stir while adding, the powder liquor ratio is controlled at 1:1.10-1:1.25; Coating stirred 1 hour, measured viscosity with flow cup, and if viscosity is not in the time of 8-20 ℃, in the time of 40-70s and 20-35 ℃; In the scope of 25-35s, be adjusted to acceptability limit, coating leaves standstill more than 2--4 hour and just can use after stirring; Repetition measurement dope viscosity before the dip-coating material, and be adjusted to acceptability limit immerses module then and moves up and down in the coating and rotate, and mentions the back and drips and remove unnecessary coating; And the rotation module, make coating cover the module surface, be coated with bubble then with the brush coating and brush away bubble if having to lack;

B, stucco: the 70 order quartz sands of in sander, packing into, start sander, in the floating layer of sand of module insertion with first-class coating, rotate module during stucco;

C, the module that will spread sand immersed in the ammonium chloride sclerosis pond sclerosis 20--25 minute, took out module then with clear water flush away hardening bath, hung on the support air-dry 40--60 minute;

D, configuration transition zone coating; Measure dope viscosity with flow cup; Adjusting after the viscosity module with drying immerses in the coating and is coated with extension; Sprinkling 20-40 purpose high alumina sand, hardened 40-50 minute in the aluminium chloride pond of putting into pH value 1.5--2.5, proportion >=1.18, took out to be suspended to air-dry room-dry 40-60 minutes after module is washed.