How to prevent the occurrence of streaks due to the continuous improvement of casting molds

Precision casting mold equipment products have strong competitiveness in the sales market, and have been further improved according to the application performance of the products. Under the effective promotion of maintaining the advantages and functions of the product application, sodium silicate precision castings should be used according to the use value of the product. The actual effect, improve the full play of its product application characteristics, continuously improve the overall improvement of its advantages with reliable product application characteristics, and improve the effective improvement of its practical significance with the comprehensive promotion of products, and then reflect the actual effect. Features of the product.

In the application that closely focuses on the improvement of the quality of precision casting equipment, the products should be used to improve the full application of its overall application, integrate the reflection of the use value of its products, and deepen the use of its products with reliable product application capabilities. Reflect and improve the rapid development of its overall advantages and capabilities. The precision of castings obtained by various forging methods is different, the initial project investment and output rate are different, and the final economic benefits are also different. Therefore, in order to ensure more, faster, better, and less economical, it should be applied to all fields. The basic cost estimate is carried out to solve the forging method used, so as to clarify the forging method that has high economic benefits and can ensure the specified forging method of castings. The necessary machinery and equipment for the basic steps of forging sodium silicate high-precision steel castings are: high-precision casting wax injection-wax injection machine, ice water machine, central air conditioner; dipping-slurry barrel, floating sand machine, air conditioner, dewaxing furnace, Dehumidifier, deliquoring barrel, static placing barrel, robotic arm and fully automatic centralized wax supply system software can be used for slurry soaking; Rongjin-sintering furnace, high-frequency melting furnace, shell shaker; post-processing process-cutting machine, grinding machine Removal machine, sand blasting machine, sand cleaning machine, heat treatment furnace, high-speed punching machine; maintenance-pneumatic grinding equipment, argon brazing and hot-melt welding machine, grinding machine; quality assurance-spectrum analyzer, three-dimensional these. This is all relatively common, and if necessary, it must be a vacuum pump casting furnace or a vacuum heat treatment furnace or x-ray. I don't know if you are making ordinary steel parts or comparing, the necessary equipment for the basic steps of sodium silicate precision castings are: wax injection - wax injection machine, ice water machine, central air conditioner; slurry - slurry barrel, floating sand machine , central air-conditioning, dewaxing furnace, dehumidifier, deliquor bucket, static placing bucket, robotic arm and fully automatic centralized wax supply system software can be used for dipping; Rongjin-sintering furnace, spiral melting furnace, shell shaker; Post-processing process - cutting machine, grinding machine, sand blasting machine, sand cleaning machine, heat treatment furnace, high-speed punching machine; maintenance - pneumatic grinding equipment, argon brazing and hot-melt welding machine, grinding machine; quality assurance - spectrum Analyzer, three-dimensional, these. This is all relatively common, and if necessary, it must be a vacuum pump casting furnace or a vacuum heat treatment furnace or x-ray. Forging of sodium silicate high-precision steel castings is a general term for the processing technology of castings with specifications. Compared with the traditional sand casting process, the size of the castings produced by the precision casting equipment is increased, and the surface smoothness is increased. Its products are high-precision, complicated, and close to the appearance of the parts. They can be applied immediately without production processing or very little production processing. Therefore, investment casting is an excellent processing technology for this near-net shape. As everyone knows, patterns will be formed during the whole forging process. What is going on? 1. The imprints left by filling the die with the double metal flow in different steps. 2. The temperature of the abrasive tool is low. For example, the mold temperature of zinc alloy material is less than 150 °C, and the mold temperature of aluminum alloy profile is less than 180 °C, which is easy to cause this disadvantage. 3. The charging rate is too high. 4. Excessive use of architectural coatings. Countermeasures for removal: 1. Adjust the section or position of the inner glue inlet. 2. Adjust the temperature of the abrasive tool and expand the overflow groove. 3. Moderately adjust the filling rate to change the metal material

The flow of liquid filling die. 4. The application of architectural coatings is thin and well-proportioned. With the rapid development of the precision casting equipment manufacturing industry, the use of precision castings has become more and more common. To put it bluntly, the key nature of high-precision steel casting machinery and equipment is precision, and there are many factors that endanger the precision of precision castings. : The structure of casting parts, casting parts materials, mould making, shell making, sintering, pouring and many other factors are harmful, among which all the stage settings and unscientific operation will cause changes in the shrinkage rate of casting parts, resulting in There is an error in the precision of casting specifications and regulations. The following are the factors that can lead to precision shortcomings in precision casting specifications:

(1) Hazards of casting structure: a. The wall thickness of the casting is large, and the shrinkage rate is large, and the wall of the casting is thin and the shrinkage rate is small. b. The random shrinkage rate is large, and the blocking shrinkage rate is small.

(2) Hazards of casting materials: a. The higher the carbon content in the raw material, the smaller the linear shrinkage rate, the lower the carbon content, the greater the linear shrinkage rate. b. The casting shrinkage rate of common materials is given: forging shrinkage rate K=(LM-LJ)/LJ×100%, LM is the die specification, and LJ is the casting specification. K is affected by the following elements: wax pattern K1, casting structure K2, aluminum alloy type K3, pouring temperature K4.

(3) The harm of mold making to the linear shrinkage rate of castings: a. The harm of wax injection temperature, wax injection working pressure, and pressure holding time to investment specifications is the most significant in terms of wax injection temperature, followed by wax injection working pressure. Pressing time is of little detriment to the final specification of the investment after ensuring that the investment is formed. b. The linear shrinkage of wax (mold) material is about 0.9-1.1%. c. When the investment mold is stored, it will deepen and cause shrinkage, and the shrinkage value is about 10% of the total shrinkage, but after 12 hours of storage, the investment mold specification is basically stable. d. The axial shrinkage rate of the wax mold is only 30-40% of the long and short azimuth shrinkage rate. The damage of the wax injection temperature to the random shrinkage rate far exceeds the damage to the resistance shrinkage rate (the best injection wax temperature is 57-59 ℃). , the higher the temperature, the greater the shrinkage).

(4) Hazards of shell-making raw materials: Zircon sand, zircon powder, Shangdian sand, and Shangdian powder are selected because their thermal expansion coefficient is small, only 4.6×10-6/℃, which can be ignored.

(5) Hazards of shell burning: Because the thermal expansion coefficient of the shell is small, when the shell temperature is 1150 ℃, it is only 0.053%, so it can be ignored.

(6) Hazards of casting temperature: the higher the pouring temperature, the greater the shrinkage rate, the lower the pouring temperature, the smaller the shrinkage rate, so the pouring temperature is as high as possible. High-precision steel casting machines and equipment with high performance should use their strengths to select technically excellent modeling design and core making methods. The production line of the old shock-type or shock-pressure molding machine has insufficient production rate, high labor efficiency and high noise, and is not suitable for many production regulations. It should be gradually updated in various aspects. For small and medium-sized high-precision steel casting machinery and equipment in Shandong Province, a boxless high-pressure molding machine production line with horizontal or vertical TCM treatment can be selected, and the solid shape design has high productivity and small footprint; A variety of high-pressure molding machine production lines and air-blast molding design lines can be used to integrate the requirements of rapid and high-precision molding design production lines. Core making methods can be used: cold core box, hot core box, shell core Equal core method. High-precision steel casting machinery and equipment refers to the general name of this processing technology, which refers to the processing technology of castings obtained by using high-precision modeling and design methods.

Machines and equipment can obtain many castings, such as: hardware, auto parts, electric locomotive parts and various valves, so it is a very critical processing technology in today's industrial production. So when developing high-precision steel casting machinery and equipment, people must pay attention to what aspects will affect the accuracy of high-precision steel casting machinery and equipment specifications? At first, the structure of castings is such a very critical hazard factor. Usually, the thicker the wall of the casting, the greater the shrinkage, and in turn the smaller; the material of the casting will also harm the intensive reading of the high-precision steel casting machinery and equipment. The higher the carbon content in the usual raw materials, the smaller the linear shrinkage. The smaller it is, the greater the linear shrinkage rate in turn; finally, the shrinkage rate of the casting is also very harmful to the mold making. Usually, the temperature and working pressure of the ground wax and the pressure holding time are harmful to the specifications. It is very large; finally, shell making is a very critical factor, generally all of which are zircon sand, zircon powder, Shangdian sand, and Shangdian powder, because their surge index is very small; the fifth , the casting temperature is a very critical factor, the higher the casting temperature, the greater the shrinkage rate, so the casting temperature must be well controlled.