Original
By certification 
Qinhuangdao Zhongwei Precision Machinery Co., Ltd. mainly produces various grades of Grey iron castings, gray iron castings and other high-quality mechanical parts, steel castings, and various types of castings of various materials. It is a leading casting enterprise in Qinhuangdao City. Our company is equipped with advanced product manufacturing technology and testing methods, pre-furnace analyzer, post-furnace testing equipment, and spectrometer imported from Germany to more accurately analyze the chemical composition and physical properties of castings. The main products are valve castings, locomotive accessories, and various mechanical parts, which are suitable for all walks of life. Diesel engines, compressors, trains, automobiles, elevators, pumps, pump heads, valves, impellers, construction machinery, etc.
Product Performance
1. The properties of gray cast iron are as follows:
(1) Gray cast iron also has very good casting performance and cutting performance, and because of the existence of graphite, it can also play the role of shock absorption and wear reduction.
(2) The performance of Grey iron castings mainly depends on the performance of the matrix and the quantity, size, distribution and shape of graphite. The gray cast iron composed of fine flake graphite and fine-grained pearlite matrix has the best performance and the widest range of applications.
(3) The tensile strength and plasticity of gray cast iron are also higher than those of general or the same matrix steel, and the graphite flakes have little effect on the compressive strength of gray cast iron, so gray cast iron is often widely used to withstand compressive loads. parts, such as bearing housings and machine bases, etc.
2. Metamorphic treatment is inoculation treatment---inoculation of cast iron
(1) Inoculated cast iron can also change the performance of castings, the strength of inoculated cast iron is also greatly improved, and its toughness and plasticity will also be improved.
(2) The metamorphic treatment is mainly to add a metamorphic agent to the molten iron before the molten iron is poured to promote grain refinement. Generally, the most commonly used modifier is ferrosilicon with a silicon content of 75%, and the addition amount is generally about 0.4% of the weight of the molten iron.
Zhongwei Precision Machinery has been striving to avoid casting defects encountered in the production process of castings, and is also using various processes to improve the performance of gray cast iron to ensure the quality and service life of gray cast iron castings.
Product Description
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:
Gray iron: ISO standard: 100, 150, 200, 250, 300, 350
Ductile iron: ISO standard: 400-18, 450-10, 500-7, 600-3, 700-2, 800-2
—Other materials: cast iron, cast steel, cast aluminum, cast copper, alloy steel, etc. can be customized according to customer requirements.
According to the country, please check the corresponding national material grade in the table.
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5. Available software: Pro/E, Auto CAD, Solidwork.
6. 2D & 3D drawings (Igs, PDF, JPEG, DWG, CAXA, UG, Stp...etc) can also be made according to samples.
7. Production process: sand casting, lost foam casting, water glass lost wax casting, silica sol investment casting, etc.
8. Product weight range: from 0.01kg to 2000kg;
Process Flow
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.
Available Materials List:
Grey iron castings and ductile iron
Other materials: cast iron, cast steel, cast aluminum, cast copper, alloy steel, etc. can be customized according to customer requirements.
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.
Scope of Application
1. Engine parts
2. Auto parts
3. Mechanical parts
4. Railway train parts
5. Truck parts
6. Tractor accessories
7. Construction equipment
8. Agricultural equipment
9. Other industrial fields
http://www.zw-metalware.com/
