News - Page 2 - High and low pressure casting, gravity casting, mold making, focused on aluminum alloy casting plant

5 common defects and solutions such as casting shrinkage holes, surface roughness and lack of finish

2024-08-03

I. Porosity phenomenon (including bubbles, choking holes, air pockets) Causes: 1, the mold preheating temperature is too low, the liquid metal through the pouring system is cooled too quickly. 2, mold exhaust design is poor, gas emission is not smooth. 3, bad paint, poor exhaust, or even volatile or decomposition gas. 4, There are holes and pits on the surface of the mold cavity. After the liquid metal is injected, the gas rapidly expands and compresses the liquid metal, forming choking holes. 5、The surface of the mold cavity is rusted and not cleaned up. 6、Improper storage of raw materials (sand core), not preheated before use. 7、Bad deoxidizer, or insufficient dosage or improper operation. The following are short methods to prevent gas holes (bubbles, choke holes, air pockets): 1, within the appropriate range to control the pouring temperature, to avoid gas expansion is too high. 2、Mold preheating sufficiently, using good permeability, particle size...

High pressure casting Die casting machine tonnage selection

2024-08-03

These days a customer asked me how to choose the right die casting tonnage is not die casting tonnage the bigger the better, so write this article slightly explain the die casting mold tonnage selection. Picture high pressure casting is a kind of pressure casting, in the case of high speed and high pressure liquid through the pressure chamber, by the die casting machine hammer into the mold internal molding, die casting machine tonnage the larger the pressure is mainly reflected in the clamping force, and die casting hammer. So how to judge the die casting products need the size of the tonnage? How to calculate the high pressure die casting tonnage, here we mainly from four aspects to consider: 1, calibration die casting products clamping force What is clamping force? Clamping force refers to, high pressure die casting products in the casting process, the molten metal liquid with high pressure into the mold cavity will produce a hold up the force, this time high pressure die casting machine exerted to the mold of...

Classification of metal manufacturing processes

2024-08-03

Hot working includes casting, forging and welding. Cold working, also known as metal cutting process, including tool cutting process (which has turning process, drilling and boring process, planing, inserting, broaching, milling process, abrasive cutting process; the processing of gear teeth). The following are briefly introduced. (A) casting The casting process is to pour liquid metal into the mold, to be cooled to obtain a certain shape and sex of the casting. This is the method of molding metal in the liquid state. Casting can produce billet blanks of complex shapes, especially complex internal cavities, with unlimited size and weight. Both single-piece production, can also be mass production, the use of most of the material from a wide range of sources, low prices, but also available scrap and waste parts, so the cost is low. Castings and parts of the shape and size close to the processing allowance is small. Casting...

Low pressure casting aluminum wheel hub crack formation causes and improvement measures

2024-08-03

Low-pressure casting can achieve a high degree of mechanization and automation, improve productivity (10 ~ 15 type / h), it can also reduce many human factors that are detrimental to the production process, improve the rate of finished products, and greatly reduce the labor intensity of workers. However, the quality of low pressure casting by the process plan, process parameters, mold structure and manual operation and other factors, any design unreasonable or improper operation of the link may lead to low pressure casting defects. The generation of aluminum wheel cracks is an important factor that affects the production cost and productivity of enterprises. Therefore, it is particularly important to discuss the causes of cracks in low pressure casting aluminum wheels. Next, I will discuss with you the formation and elimination measures of low pressure casting aluminum alloy automotive wheel cracks in China. The main factors affecting the generation of cracks For the same alloy, whether the wheel hub is cracked or not, towards...

Quality of castings

2024-08-03

Mainly includes appearance quality, internal quality and use quality. Commonly used in Ningbo Hexin die casting, low pressure, gravity products of various non-ferrous metal casting quality analysis. Castings quality range: Appearance quality Surface roughness: usually by comparing the sample block or instrumental measurements to determine the smoothness of the casting surface. Surface defects: such as sand eyes, sand holes, sticky sand, oxidized skin, air holes, shrinkage holes, slag entrapment, succulent, missing meat, cracks, etc. These defects will not only affect the appearance of the casting, but also affect the performance of the casting. Size deviation and shape deviation: Size inspection and shape inspection are usually used to assess whether the size and shape of the castings meet the design requirements. Weight deviation: Whether the weight of the casting is within the permissible limits. Intrinsic quality Intrinsic quality is the core part of casting quality, mainly including the following aspects...

Ningbo Hexin Moulding & Plastic Co.

2024-08-03

Ningbo Hexin Molding Co., Ltd. in the era of rapid development of information, based on the development of science and technology, information technology. A small program was released on WeChat. As long as the WeChat search Ningbo Hexin, you can check Ningbo Hexin, which greatly facilitates new and old customers to recognize the development of Ningbo Hexin. The strategic direction of the current stage of development . Ningbo Hexin shows a variety of aluminum alloy products through WeChat applet. The range of Ningbo Hexin products and services process includes: Let customers intuitively understand the range of products produced by Ningbo Hexin:

Confirmation of wall thickness and minimum wall thickness machining allowance

2024-08-02

Wall thickness at the area, mm ² ~ 25002500 ~ 1000010 000 ~ 50 000 ¡"50 000 minimum wall thickness, mm0.71.01.52.2 common wall thickness, mm2.02.53.03.51.casting fillet die casting casting fillet of the minimum radius of 0.3 mm, the recommended radius of 0.5 mm.2.machining allowance 2.1 die casting Required machining allowance applies to the entire gross bad pieces, that is, all the surfaces to be machined only a value, and the value of the final machined pieces of the finished product after the maximum contour size to determine the maximum size of a part of the die casting casting in the casting state should not exceed the size of the finished product with the required machining allowance and casting the total tolerance of the sum of the (see Figure 2). When skew is used, the skew shall be considered separately.2.2 Required machining allowanceThe required machining allowance code is RMA, and its machining allowance grade...

Commonly used casting aluminum alloy grades

2024-08-02

Commonly used casting aluminum alloy brands Main features and uses of each brand of aluminum alloy ZL101 Simple composition, easy to melt casting, good casting performance, good airtightness, good welding and cutting processing performance, but the mechanical properties are not high. Suitable for casting thin-walled, large area, complex shape, low strength requirements of various parts, such as pump shells, gear boxes, instrument shells (frames), home appliances and so on. Mainly used in sand casting and metal casting. Zl101A Due to the addition of trace Ti on the basis of ZL101, grain refinement, strengthened alloy organization, its comprehensive performance is higher than ZL101, ZL102 has good corrosion resistance, can be used as a motorcycle, automobile, household appliances and instrumentation products on the general load of the engineering structure and a variety of structural components of high-quality castings. At present, its use is second only to ZL102. mainly used...

Foundry Design Public was established

2024-08-02

Established casting design weibo official account Casting design content 1, analysis of casting process types. 2, analyze the advantages and disadvantages of casting process. 3, casting process design formula analysis. 4, casting the actual process of casting process analysis.