Do you know the inspection specification of large machine tool castings?

Wuxi Hongming Casting Co., Ltd. takes you to understand the inspection specifications of large machine tool castings

The appearance quality of large machine tool castings refers to the surface roughness, surface defect, scale error, shape error and component error of machine tool castings. The intrinsic quality of machine tool castings mainly refers to the chemical composition, physical function, mechanical function, metallographic structure of machine tool castings, as well as holes, cracks, doping, segregation and other conditions existing in the machine tool castings. The use quality of machine tool castings refers to the long-term ability of machine tool castings under different conditions, including the functions of not afraid of cold and heat, fatigue, shock absorption, and the process functions of machinability and weldability. The quality of machine tool castings has a great impact on the function of mechanical products. For example, the quality and scale stability of machine tool castings directly affect the accuracy of the machine tool. The quality of machine tool castings has a great impact on the function of mechanical products. For example, the machine tool castings are not afraid of grinding and scale stability, which directly affects the accuracy of the machine tool.

Below, introduce the inspection specifications of large machine tool castings:

1. Specification of chemical composition of castings;

Second, the mechanical function specification of castings, tensile strength, hardness;

3. Metallographic specifications of castings, carbide content, pearlite content, graphite length, etc.;

Fourth, the scale requirements of castings;

Large machine tool castings are widely used in the processing of instruments, standard parts, bearing industry, electronics, light industry, auto parts and other parts, especially suitable for non-ferrous metals. It has the advantages of good scale accuracy, good rigidity, small processing allowance, good appearance quality, easy to operate, shorten the production cycle, improve the production rate, and good castings and shock absorption. The melting point is relatively low, the fluidity is outstanding, and the shortening rate is small. Machine tool castings are mostly bed, its structure is simple, the process function is good, and it is easy to process the guide rail surface. The horizontal bed with a horizontally placed tool holder can improve the motion accuracy of the tool holder, and can generally be used for the layout of large CNC lathes or small CNC lathes. However, because the lower part of the horizontal bed is small, it is difficult to remove chips. From the perspective of structural scale, the horizontal placement of the tool holder makes the transverse scale of the slide longer, and then increases the structural scale of the width direction of the machine tool.

The two important links in the whole process of large machine tool castings are modeling and pouring. Sand casting is preferred for machine tool castings, because sand casting is more expensive than other casting methods, the production process is mechanized, and the production cycle is not long. When the wet type can not meet the requirements, then consider using clay sand table dry sand type, dry sand type or other sand type. Machine tool casting machine tool casting liquid metal pouring production should follow the principle of high temperature furnace, low temperature pouring. Machine tool castings before sand compaction pay attention to a few points: the appearance of residual carborundum dispersion, if the direct sand compaction, the position of the new sand is not uniform, and then lead to the plate cutting force is not uniform; Because the plate often presses sand. Make the surface hardened, the new sand is not easy to press into; There are scratches on the surface of the sand pressing plate. The sand is not easy to press in. When repairing the measuring block, it is easy to run sand and scratch the surface of the measuring block.

The above is the content of our Wuxi Hong Ming Casting Co., Ltd. today, if you have any consultation, welcome to call our company's phone!