Common defects of aluminum alloy castings

Aluminum alloy castings are prone to casting defects such as shrinkage cavities, sand holes, pores, and slag inclusions in the production process. How to repair the pores and other defects of aluminum alloy castings? If electric welding, argon arc welding and other equipment are used for repair, it is easy to produce thermal deformation and other side effects due to the large amount of heat release, which cannot meet the requirements of repair welding. The cold welding repair machine is based on the principle of high-frequency electric spark instantaneous discharge and non-thermal surfacing. It is used to repair the casting defects of aluminum alloy castings. Due to the small heat affected zone of cold welding, it will not cause annealing deformation, cracks, hard spots and hardening, the repair material and the substrate may be cured simultaneously after melting.

2022-05-13

What is aluminum alloy casting and what are its applications?

Aluminum alloy casting mold refers to the gravity casting process in which molten metal is poured into the mold under the action of the earth's gravity, also known as gravity casting. Generalized gravity casting includes sand casting, metal casting, investment casting, lost foam casting, clay casting, etc. The narrow sense of gravity casting mainly refers to metal casting, so the broad sense of gravity casting is obviously more. Aluminum alloy casting die-casting mold refers to the mold that casts metal parts on a special die-casting die forging machine and completes the die-casting process. The basic process of die casting is as follows: molten metal is cast at low speed or high speed and filled into the cavity of the mold, which has a movable cavity surface.

2022-04-28

What problems will occur in the process of aluminum alloy casting

Some data show that the solubility of more hydrogen in aluminum alloys increases with increasing temperature of the alloy solution and decreases with decreasing temperature. When the solution produced by aluminum alloy casting changes from liquid to solid, the solubility of hydrogen in aluminum alloy decreases by 19 times. Therefore, during the cooling and solidification process of the aluminum alloy liquid, at a certain moment of hydrogen, the hydrogen content exceeds its solubility and is precipitated in the form of bubbles. The hydrogen bubbles formed by supersaturated hydrogen evolution will form fine and scattered pores during the solidification process, and then float upward and discharge.

2022-04-13

Why do aluminum alloy casting

Aluminum alloy casting has good casting performance and can be made into parts with complex shapes; it does not require a lot of additional equipment; it has the advantages of saving metal, reducing costs, and reducing working hours, and is widely used in aviation, civil and other industries. Aluminum alloy casting is used to manufacture beams, gas turbine blades, pump bodies, towers, hubs, intake lips and engine casings. It is also used in the manufacture of automotive cylinder heads, gearboxes and pistons, instrument housings and turbocharger pump bodies.

2022-03-29

How to carry out surface treatment work for aluminum alloy casting products

As we all know, the processing system of aluminum alloy casting will affect the whole operation process, so what are the factors that affect the aluminum alloy casting? The reasonable design of the low pressure mold can dredge the feed channel in the aluminum alloy casting process, produce good and rapid continuous condensation effect, realize the condensation from the far end to the riser, prevent forging defects and improve the output power. The preheating temperature of the mold is generally 400-450°C. The temperature of the aluminum alloy casting mold is too low or too high will destroy the reasonable temperature field of the mold, and the casting is difficult to form or the pass rate is low. The coating on the surface of the mold has the ability to resist thermal shock.

2022-03-14

A brief understanding of the casting mold

With the rapid development of automobile, motorcycle, aerospace and other industries, casting molds are growing rapidly at a rate of more than 25% per year. Casting mold technology has made great progress, but the automobile as the representative of the large aluminum alloy engine block and complex pressure casting mold mainly rely on imports. China's automobile and motorcycle industry has entered a period of rapid growth, and its output has increased significantly for many years. It is foreseeable that in the next 10 to 20 years, China's casting mold production will continue to be driven by the strong thrust and rapid growth of the automobile industry. In the context of energy saving and emission reduction, the growth rate of casting molds will slow down, while the growth rate of aluminum-magnesium alloy casting molds and squeeze casting molds will slow down.

2022-02-28

How to extend the service life of casting molds

During the maintenance of casting molds for pressure parts such as pressure plate, upper force plate, discharge plate and pneumatic ejector, check the relationship between various parts and whether there is any damage, repair the damaged parts, check whether there is leakage of the cylinder cap and take measures according to the specific situation. If the trachea is damaged, replace it. Several important parts of the casting mold should be checked: the ejection and guiding parts are used to determine the opening and closing movement of the mold and the ejection of the plastic parts. If any part of the mold gets stuck due to damage, it will stop production. Therefore, the stripper should be maintained frequently. After completing a production cycle, the working surface of the casting mold, the movement and the guide rail are coated with anti-rust oil. Special attention should be paid to the protective teeth

2022-02-14

What is casting mold

Casting mold means that in order to obtain the structural shape of the part, the structural shape of the part is prefabricated with other materials that are easy to form, and then the mold is put into the sand mold, so that the cavity part forms the same structure in the sand mold. The fluid liquid is then poured into the cavity. Once the liquid cools and solidifies, a part having the same shape and structure as the mold can be formed. The casting mold is an important part of the casting process. Casting mold refers to the mold used for casting molding in the casting process. The casting mold is matched with the casting process, mainly including gravity casting mold, high pressure casting mold (pressure casting mold), casting mold, squeeze casting mold, etc.

2022-01-22

Test mode of casting mould

The mold needs to be baked according to regulations during the production process, and the material in the barrel should be correct. In order to prevent defective products or sundries from being injected into the mold, which may block the mold, the material pipe should be thoroughly cleaned. The barrel temperature of the casting mold and the mold temperature should be compatible with the processed raw materials. If you want to produce a more satisfactory casting mold product, you should adjust the pressure and injection volume. It should be noted that it is impossible to remove burrs during the production process of the casting mold. Some cavity products are not completely solidified and even difficult to remove burrs.

2022-01-07

How to maintain the casting mold

Analyze the casting mold, what kind of mold structure, arrange the product process, determine the content of each process, and use the design software for product design. When designing a product, it usually starts with a subsequent process. Next, let's talk about the daily maintenance knowledge of casting molds: 1. The punch is easy to break, bend, and bite during the use of the casting mold. The punch sleeve is generally bitten. Damaged punches and sleeves are generally replaced with parts of the same specification. The parameters of the punch mainly include the size of the working part, the size of the installation part, the length size, etc. 2. Fastening parts. Check for loose or damaged fastening parts. The method used is to replace the same specifications

2021-12-23