Silica Sol Casting

The Silica sol casting method is: first make a model of the casting to be made with wax material, and weld the model to the gate rod with the same material to make a module (when the casting is large, it can be a single group). The surface of the group is dipped in refractory paint (a mixture of water glass or silica sol and fine sand), and then sprinkled with refractory sand (the dipping and sanding must be repeated several times to make the sand layer thick enough). The module is heated, and the wax material is released from the gate to form an empty shell. The empty shell is baked to make it into a solid mold shell, and the metal liquid is poured from the gate, and after condensation, it becomes a metal casting.

Product Description

Basic information of Silica sol casting

1. Implementation standards: The company strictly implements ISO9001 & TS 16949 certification.

2. Product material standards: ISO, GB, ASTM, SAE, ISO, EN, DIN, JIS, BS

3. Main processes: sand casting, silica sol investment casting, water glass investment casting,shell casting,deburring, sand blasting, machining, heat treatment, leak testing, surface treatment, etc.

4. Available materials:

High manganese steel, high chromium steel, high nickel steel, carbon steel, alloy steel, stainless steel, gray iron, cast iron, cast steel, cast aluminum, cast copper, etc. can be customized according to customer requirements.

Silica Sol Casting Shell Classification

Precision casting is to obtain high-precision castings by pouring molten metal solution into shell molds. Today, the manufacturer of precision casting parts, we will talk to you about the knowledge and characteristics of 4 different shell-making processes of precision casting in detail.

1. Water glass shell

This process technology has a history of production and manufacturing in my country for nearly 50 years. Through the perseverance of colleagues in the precision casting industry for decades, the application and scientific research of water glass shell process technology has reached a high level. Over the years, based on the improvement of the back shell refractory material and the application and promotion of new hardeners, the compressive strength of the water glass shell has been doubled.

2. Composite shell

Compared with the water glass shell, the surface quality of the casting is greatly improved, the surface roughness is reduced, the surface defects are reduced, and the repair rate is reduced. It can be applied to high alloy steel such as stainless steel and heat-resistant steel. The production cycle is much shorter than that of the low temperature wax-silica sol mold, and is similar to the water glass mold.

3. Silica sol (low temperature wax) shell

This process technology is in line with national conditions, and has great adaptability and advantages in precision casting of more than 1kg, especially medium and large castings of more than 5kg. Compared with the composite shell, the production quality is stable, especially the casting has high dimensional accuracy, because it has no water glass, the shell has good high temperature performance, and the shell has high air permeability and strong creep resistance after firing at 1000-1200 °C It can not only be used for thin-walled parts, small and medium-sized castings with complex structure, but also can produce extra-large castings weighing 50-100kg, such as water pumps, impellers, guide casings, pump bodies, ball valve bodies, valve plates, etc. Compared with thin-walled small and medium-sized castings or large castings, fork shells or lifting shells can be used for direct casting before the furnace, and high yield can be obtained.

4. Silica sol (medium temperature wax) shell

It is a commonly used precision casting processing technology in the world. It has high casting production quality and low repair rate. It is especially suitable for small and medium-sized castings and extra-small castings with high surface roughness requirements and high dimensional accuracy. (2-1000g).

Through the above introduction, I believe that everyone has a certain understanding of the four shell-making processes of precision casting. Qinhuangdao Zhongwei Precision Machinery Co., Ltd. produces water glass lost wax precision casting, lost foam precision casting Sand casting casting process has rich production experience. We expect manufacturers from all over the world to consult and negotiate business.

Provide joint development and one-stop customized services from mold manufacturing to precision casting production. Introducing foreign advanced technology and equipment, and constantly striving to innovate through our own efforts, we are committed to providing high-quality precision casting for China's high-end manufacturing industry.

Post Casting Process

1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering

2. Processing equipment: CNC, WEDM, lathe, milling machine, drilling machine, grinder, etc.;

3. Surface treatment: powder spraying, chrome plating, painting, sandblasting, nickel plating, galvanizing, blackening, polishing, bluing, etc.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam).

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control: the defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements

3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine;

4. Provide after-sales service.

5. The quality can be traced back.

Application

Silica sol casting is used in textile castings, sewing castings, auto parts precision castings, agricultural machinery precision castings, textile machinery precision castings, rice transplanter needle castings, lock castings, stainless steel castings, silica sol precision castings, carbon steel castings, sewing machine castings, hardware Precision castings, marine hardware castings, high-speed rail hardware castings, lighting hardware castings, furniture hardware castings, marine hardware castings and other precision castings. The international advanced silica sol casting technology is used, and various castings have high precision and quality assurance.