subject: Analysis Of Steel Casting Required For Testing Machines [print this page] Sand steel casting apparatus of cooling rate on the impact of organizations, with different solidification cooling intensity on the solution be caused by different cooling zones and the latent heat release rate. Solid solution alloys Ingots are generally from the surface of fine grain zone, columnar grain zone and coarse equiaxed central zone composed of the five elemental analyzer also want all the full equiaxed. Sand steel casting equipment undercooling, sand equipment is conducive to the formation of equiaxed grains have been stable, and maintenance of the stability number, There is also conducive to the mold wall nucleation and the formation of equiaxed and free, thus further increasing the unit volume of grain number; However, when the undercooling increased to a certain total, there may be excessive because of the release of latent heat caused by the solution of local overheating, so the money has been pouring small grains were formed by melting, reduce the growing up core. Sand steel casting equipment In addition, the mold wall formation of equiaxed grains and free no longer produced in the model of micro-regions of equiaxed ingot size and area ratio of all cut off, provided the rate for the ingot of micronized , steel casting sand casting equipment appropriate to increase the cooling rate is conducive to the rate of increase of ingot fine, that is beneficial to grain refinement.
Analysis of cast steel required for testing equipment.
Multi-element analysis instrument, an instrument that can detect all the conventional steel and other materials, elements of C, S, Mn, P, Si, Cr, Ni, Mo, Cu, Ti, Al, W, V, Zn, Fe, etc.; multi-element analyzer computer control using brand computers, electronic balance, desktop printer to print test results; multi-element analyzer software fully functional and can completely replace the traditional hand-written laboratory work, and according to the actual needs of the various units, arbitrarily set the test report format; detection huge, with 108 elements of the channel detection space, storage n curve.
Blowhole defect castings and Prevention
Lost foam steel casting of cast iron, steel casting porosity based on the following four categories of causes:
1. Abrasive liquid pyrolysis products arising from the involvement of metal pores. Such large pores, and accompanied by more than carbon black.
Prevention is to improve the process, so that liquid metal steel casting process smooth, does not produce turbulence while increasing the pouring temperature and vacuum degree and the coating layer permeability.
2. The appearance of pores caused by bad paint drying. Look dry and poor, with more moisture, coating drying adhesive joints look bad or not bad penetrate paint dry, pouring large amounts of gas generated when, easily formed anti-spray, such a case, the most easy to produce pores.
Prevention is the appearance fully dried, cast coating layer after drying time, appearance bond shall not be tainted bonding phenomenon.
3. Appearance of pores caused by excess adhesive. Binder too, gasification slow, its involvement in the formation of liquid metal holes.
Prevention is the use of low fat, gas, gasification speed binder, in the premise of ensuring a strong bond with a resin content the less the better.
4. Gating pore formed when involved in the air. Solutions through the rational design of gating system, molten metal casting process to ensure smooth flow, not volume gas.
Steel casting dimensional tolerance, and to prevent deformation
Produce castings difference sizes, deformation of the factors are: steel casting their structure, shape and size, weight distribution, changes in foam mold of the size and strength, modeling technology and operations, steel casting and so on. Here analyzes the foam mold, molding technology and operation of the steel casting dimensional tolerance and deformation.
1. Foam mold on the dimensional accuracy of castings
A, mold quality: In order to look more accurate than steel casting precision, to ensure dimensional accuracy and strength of the mold, so mold in the course of luminescence at deformation caused by the precision die size down, affecting foam quality.
B, model materials (EPS, EPMMA, STMMA) and the process of modeling: dimensional accuracy of the model affect the pattern material and process factors: the degree of cooling after molding, so look before taking mold to cool, foam end to get a good look dimensional stability, and prevent the appearance when the top of the pattern deformation. Remove the appearance of the dried, foam mold drying process is known as aging, a stable size, increase productivity, can be obtained after modeling the appearance in 60 ~ 70 "" under dry, 2 to 8 hours drying time, the actual size is not different look identical, thus affecting the dimensional accuracy of castings. Pattern density, pattern density, strength, not easily deformed.
2. Molding technology and operation on the steel casting size and deformation of ultra-poor
EPC is the shape of the foam paint brush had buried in dry sand, after compaction by vibration steel casting. As the compaction of dry sand filling process by the vibration force of the size, orientation and mobility of dry sand and other various factors, thus modeling the process of molding process and the operation of the deformation of the foam have a greater impact, operation according to steel casting structure, choose the right look like the tap intensity parameters and supplemented by the necessary technical measures.
Boxes and to prevent collapse
Part in the steel casting process the mold or partial collapse, collapse type steel casting can not be formed or in part to more meat-type collapse, or collapse, said type. As the mold with vibration-free binder for dry sand molding, mold in the steel casting process on the negative pressure pumping, the methods used to maintain pressure mold setting stable, cast iron cast steel casting process, molten metal of high thermal radiation bubble accelerated gasification, a large number of cavity formation, relying on pressure to shape, if at this time due to steel casting speed, exhaust velocity, rising velocity of liquid metal can not meet the matching requirement, there will collapse type.
EPC Cast Iron Cast Steel There are many types of defects, not to enumerate in this short, EPC deficit with foam, dry sand, paint, vacuum, liquid metal is related to a strict standard of the five relevant , to be reasonable with all kinds of defects can be gradually resolved.
Lost foam cast iron cast steel through the joint efforts of our technical staff, technology and innovation and continuous improvement, application scope and full play to the advantage of lost foam steel casting, and, with the product requirements of constant change and improve, EPC and other special steel casting process of composite applications will explore the development of EPC larger space for our cast iron pieces in a better use of EPC technology to lay a solid foundation.
