Bronze Lost Wax Casting

Bronze with tin as the main alloying element. The tin content is generally between 3 and 14%, and it is mainly used to make elastic components and wear-resistant parts. The tin content of deformed tin bronze does not exceed 8%, and sometimes elements such as phosphorus, lead, and zinc are added. Phosphorus is a good deoxidizer and also improves fluidity and wear resistance. Adding lead to tin bronze can improve machinability and wear resistance, and adding zinc can improve casting properties. This alloy has high mechanical properties, anti-wear properties and corrosion resistance, easy cutting, good brazing and welding properties, small shrinkage coefficient, and non-magnetic. Bronze bushings, bushings, diamagnetic elements and other coatings can be prepared by wire flame spraying and arc spraying. Size specifications are Ф1.6mm, Ф2.3mm. Tin bronze lost wax casting has high strength, corrosion resistance and excellent casting properties, and has been widely used in various industrial sectors for a long time.

Product Description

Tin bronze lost wax casting basic situation

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:

Tin bronze, silicon bronze, aluminum bronze, brass, red copper, titanium alloy, high manganese steel, high chromium steel, high nickel steel, carbon steel, alloy steel, stainless steel, gray iron, cast iron, cast steel, cast aluminum, etc. Customized according to customer requirements.

Product Features

In addition to tin bronze containing 3% to 14% tin, elements such as phosphorus, zinc, and lead are often added. It is the earliest alloy used by human beings and has a history of about 4,000 years. It is corrosion-resistant, wear-resistant, has good mechanical properties and process properties, and can be welded and brazed well, and does not produce sparks when impacted. Divided into processed tin bronze and cast tin bronze. The tin content of tin bronze used for pressure processing is less than 6%~7%, and the tin content of cast tin bronze is 10%~14%. Commonly used grades are QSn4-3, QSn4.4-2.5, QSn7-O.2, ZQSn10, ZQSn5-2-5, ZQSn6-6-3 and so on. Tin bronze is a non-ferrous metal alloy with the smallest casting shrinkage, and can be used to produce castings with complex shapes, clear outlines and low air tightness requirements. Tin bronze is very resistant to corrosion in the atmosphere, sea water, fresh water and steam, and is widely used in steam boilers and marine ship parts. Phosphorus-containing tin bronze has good mechanical properties and can be used as wear-resistant parts and elastic parts of high-precision machine tools. Lead-containing tin bronze is often used as wear-resistant parts and sliding bearings, and zinc-containing tin bronze can be used for high air tightness castings.

The solidification range of tin bronze is large, and the dendrite segregation is serious; it is not easy to form concentrated shrinkage pores during solidification, and the volume shrinkage is very small; the reverse segregation of tin is prone to occur in the ingot, and white spots (8-phase precipitation) can be seen on the surface of the ingot in severe cases. There are even tin-rich particles, commonly known as tinsweat. Improving casting methods and process conditions can reduce the degree of reverse segregation; in liquid alloys, tin is prone to form hard and brittle inclusions SnO2, and smelting should be fully deoxidized to prevent inclusions due to inclusions. The mechanical properties of the alloy are reduced; the sensitivity to overheating and gas is very small, and it can be welded and brazed well; no spark occurs when impacted, non-magnetic, cold-resistant, and has extremely high wear resistance.

Industrial Tin Bronze Tin bronze is an important copper alloy used in industry. In order to improve its casting, mechanical and wear resistance, and to save tin, phosphorus, zinc, lead and other alloying elements are added to tin bronze. Therefore, tin bronze can be divided into three categories: tin phosphor bronze, tin zinc bronze and tin zinc lead.

Tin Bronze Lost Wax Casting Categories

Phosphorus is a good deoxidizer for copper alloys, which can increase the fluidity of the alloy, improve the technological and mechanical properties of tin bronze, but increase the degree of reverse segregation.

The limit solubility of phosphorus in tin bronze is 0.15%. If it is too much, a+δ+Cu3P ternary eutectic will be formed. The melting point is 628℃. It is easy to produce hot brittleness during hot rolling, so it can only be cold worked. Therefore, the phosphorus content in deformed tin bronze should not be greater than 0.5%, and during hot working, phosphorus should be less than 0.25%.

Phosphorus-containing tin bronze is a well-known elastic material. During processing, it is necessary to control the grain size before cold working and low temperature annealing after processing. The strength, modulus of elasticity and fatigue strength of the fine-grained material are higher than those of the coarse-grained material, but the plasticity is lower. The cold-worked material is annealed at 200~260℃ for 1~2h at low temperature to produce annealing hardening effect, which can further improve the strength, plasticity, elastic limit and elastic modulus of the product, and increase the stability of elasticity.

There are 4 grades of phosphorus-containing tin bronze included in the Chinese national standard. Tin (Sn) × Among them, QSn6.5-0.1 alloy is mainly used to make elastic components, especially spring contact pieces with good electrical conductivity, wear-resistant parts and diamagnetic components in instruments and meters; Qsn6.5-0.4 alloy is mainly used for papermaking, Metal meshes are manufactured in industries such as chemical and food, and are also used in the manufacture of wear-resistant and spring parts;

QSn7-0.2 alloy is used for parts that bear friction under moderate load and sliding speed, such as bearings, bushings, turbines, etc., and can also manufacture elastic elements and other mechanical and electrical parts;

QSn4-0.3 alloy is used in the production of various pipes in pressure gauges as sensitive components, and is known as pressure gauge bronze.

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

Copper is a non-ferrous metal that is closely related to human beings. It is widely used in electrical, light industry, machinery manufacturing, construction industry, national defense industry and other fields. It is second only to aluminum in the consumption of non-ferrous metal materials in my country.

Tin bronze is a non-ferrous metal alloy with the smallest casting shrinkage, and is used to produce castings with complex shapes, clear outlines and low air tightness requirements. Tin bronze is very resistant to corrosion in the atmosphere, sea water, fresh water and steam, and is widely used in steam boilers and marine ship parts. Phosphorus-containing tin bronze has good mechanical properties and can be used as wear-resistant parts and elastic parts of high-precision machine tools. Lead-containing tin bronze is often used as wear parts and sliding bearings. Zinc-tin bronze can be used for high air tightness castings.

Tin bronze lost wax casting is the most widely used and the largest amount in the electrical and electronic industries, accounting for more than half of the total consumption. Used in all kinds of cables and wires, such as motors and transformers, switches and printed circuit boards In the manufacture of machinery and transport vehicles, used in the manufacture of industrial valves and fittings, instruments, plain bearings, moulds, heat exchangers and pumps, etc.

It is widely used in the manufacture of vacuums, distillation pots, brewing pots, etc. in the chemical industry.

In the defense industry, it is used to manufacture bullets, shells, gun parts, etc. For every 3 million rounds of bullets, 130-140 tons of copper are needed.

In the construction industry, it is used as various pipes, pipe fittings, decorative devices, etc.