Ten things that must be paid attention to in precision casting! 1. Unblock all obstacles to the channel and site. 2. Check if the ladle is dry, whether the bottom of the bag, the ear, the bag and the end are safe and reliable, and whether the rotation is flexible. Do not use dry Iron ladle. 3, all tools in contact with molten iron, must be preheated to 500 degrees Celsius before use, otherwise it should not be used. 4, the ladle should not exceed 80% of the volume, the ladle should be smooth and slow, keep the steps to prevent the overflow of molten iron. Cast iron 5, before the crane crane should check the iron of the hook, the chain is reliable, the chain is not allowed to knot, there is a person responsible for tracking the iron in the water There must be no staff on the line. 6. Strictly implement the "six will not fall": (1) The temperature of molten iron is not enough; (2) The molten iron grade is not poured; (3) does not b
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Effect of drying time of shell on casting quality The burr defect generally occurs on the outer surface or a large plane of the stainless steel casting, and the irregular or intermittent irregular protrusion forms a burr flash. The reason for the formation of the burr is that the crack occurs before the casting, and after the molten steel is injected, it penetrates into the crack of the shell, and a burr defect is formed after solidification. There are two types of shell drying processes: 1. The temperature of the surface layer drying room is controlled within the range of 20-24 ° C, and the humidity is in the range of 60%-70%, without wind or breeze drying. 2. The temperature between the transition layer and the back layer drying is in the range of 22-26 ° C, and the humidity is between 50% and 55%. When blowing, it is required to blow strong wind, but do not face the mold shell, try to make the air flow in the dry room.
Analysis of the causes and solutions of loose materials in stainless steel casting Stainless steel casting, whether it is a flat ingot or a round ingot, often causes problems of porosity and loose defects in the production. The pores and looseness are like twin sisters, often accompanied by a living, which brings a lot of trouble to aluminum processing. The presence of a circular hole in a stainless steel cast structure is called a pore. It is a bubble defect formed by the deposited gas in the ingot during the cooling and solidification of the metal liquid. Looseness is the process of solidification in the stainless steel casting structure. Due to the stainless steel in the liquid and solidified state, the volume is not well replenished to produce a dispersion hole. The main factor of pore formation: the gas in the melt in the solution is in a saturated state, and there is a large amount of non-metal slag in the solution. When the gas floats slowly during the
Improve the yield of castings and effectively control defects Analysis and research on stainless steel casting defects is one of the key technologies to improve the yield of castings. However, the difficulty is not small. Mainly manifested in: 1 involves a wide range of knowledge, such as alloys, casting processes, modeling materials, casting equipment and testing of production processes. 2 The diversity of the causes of casting defects, a defect can be caused by a variety of reasons, and one cause may cause several defects. 3 The restrictive nature of technical measures, such as the use of a certain measure, can prevent a certain type of defect, but may lead to another type of defect. 4 Influencing factors are difficult to control, such as the quality of raw materials, air temperature and humidity. In order to reduce casting defects and improve the yield of castings, it is necessary to effectively c
Shrinkage of stainless steel castings When stainless steel castings shrink, they are affected by some external resistance, in addition to chemical composition, temperature and phase change. The shrinkage of the casting in the mold is only hindered by the friction between the metal surface and the surface of the mold, which is called free shrinkage; if the shrinkage of the casting in the mold is otherwise hindered, it is said to be resistively shrinkage. It is obvious that for the same alloy, the resistive shrinkage is less than the free shrinkage. Stainless steel castings are subject to the following resistances when shrinking in the mold. (1) Friction of the surface of the mold. When the casting shrinks, the friction between the surface and the surface of the mold, the magnitude of the frictional resistance is related to the weight of the casting, the smoothness of the surface of the mold, and the surface coating of the mold.
How to deal with aluminum casting defects in aluminum casting manufacturers How do aluminum casting manufacturers deal with aluminum casting defects? Aluminum castings are ubiquitous in our lives, but the best things are flawed. If you notice these defects and avoid them well, then you can Better presented to the seller. Oxidation slag defects of aluminum castings. Under normal circumstances, our oxidized slag is mostly distributed on the upper surface of aluminum castings, which is more likely to occur in the corners of aluminum castings that are not ventilated. Generally, the fractures of aluminum castings are grayish white or yellow. It is generally found in x-ray or in the machining of aluminum castings, found in alkali-washed aluminum or pickled aluminum castings and anodized. Therefore, when the above problems occur, we must pass the aluminum castings and the materials should be blown to control the frequency of
Talk about how the cost of precision casting is shared? Precision casting is divided by weight, and each factory is somewhat different. (suitable for 100 grams of products) Precision casting silica sol process has 23, each labor cost, 23 labor costs, and a wax, how much is the raw material of this product, plus water and electricity. (suitable for products of more than 100 grams) The unit price of the product * the weight of the product (the price of the blank), the processing fee and the processing fee are required.
Talk about the basic concept of precision casting Precision casting includes: investment casting, ceramic casting, metal casting, pressure casting, lost foam casting. Among them, investment casting is also commonly used, also known as lost wax casting : using a suitable investment material (such as paraffin) to make a melting mold; repeating the refractory coating and blasting sand on the investment mold, hardening shell and drying; Then, the internal melting mold is melted off to obtain a cavity; the fired shell is obtained to obtain sufficient strength, and the residual investment material is burned off; the metal material required for casting is poured; the solidification is cooled, and the sand is removed after shelling, thereby obtaining High precision finished product. Heat treatment and cold working and surface treatment according to product requirements.
How is precision castings rust-proof? Corrosion or discoloration of metals or alloys in the atmosphere due to oxygen, moisture, acids, salts and humid air is known as rust or rust, which can turn metal surfaces with very high strength into low-strength compounds. For this reason, investment castings often require intermediate rust prevention. For rust prevention, water rust or oil rust is usually used. No matter which method is used to prevent rust, the castings are washed in advance to remove the dirt on the surface and promote the formation of a passivation film. The composition, temperature and use of the scrubbing solution. After the casting is washed, it should be dried with hot, dry compressed air, and then rust-proof treatment. The engineering projects recently undertaken by the precision casting company have been completed and the cooperation between the two parties is very pleasant
Five methods for preventing cracks in precision casting 1. Gray iron thin-walled parts have stronger chilling effect or faster solidification speed, so the chemical composition can be reduced by one grade (or the carbon equivalent of the ingredients can be increased). 2. The crack is generated due to the stress generated during the solidification of the casting. Therefore, the casting is preferably subjected to artificial aging treatment to eliminate the stress before processing. 3. The cracks in the castings are cold cracked (the crack is relatively flat, not oxidized, the structure is very clear) and the hot crack (the crack is more tortuous, the fracture is oxidized), so it depends on whether the phosphorus and sulfur in the chemical composition exceed the standard. . Phosphorus is prone to cold cracking, and sulfur is prone to hot cracking. 4. Increase the fillet of the intersection of the casting
How to control the quality of precision casting in the wax mold workshop Quality control is an important task in the wax mold workshop. Many defects in castings are caused by the pre-process wax pattern. Once the problem occurs, the product has been circulated to the subsequent departments and cannot or is difficult to handle. Therefore, the quality of the wax mold workshop is controlled. To do a good job of the quality of castings, this article is based on the experience of medium temperature molding materials combined with our experience, the following points: First, in order to stabilize the wax performance of the wax-making workshop, our company changed the shortcomings of the original high-temperature dehydration process to the static water discharge and the hydraulic machine dehydration process. The impurities of the wax material, the ash is greatly reduced, and the quality is guaranteed. 2. Confirm whether th
Some characteristics of stainless steel castings Stainless steel castings mainly include casting technical content, material, batch and so on. The technical difficulty is small, the batch size is large, and the material versatility of the castings is often fierce in competition. The expected profit of the castings cannot be too high. On the contrary, the castings with long technical difficulty and long development period or the castings with small batch sizes and materials are not expected to be profitable. Can be higher.
Stainless steel precision casting defect repairing method As the foundry industry often tries to solve the defects of casting. A lot of repair methods have been taken. First, caster glue: simple, extensive castings, general repairs do not require subsequent processing, and there is no special strength and hardness requirements. The added value of this type of casting is relatively low. Second, welding repair: more than 90% of the foundry manufacturers have chosen welding repair to solve the casting defects encountered in production. Due to the use of metal fillers, the weld repair performance can basically reach the standard of the base metal, and the operation is simple, the welding repair efficiency is high, and it is recognized and trusted by many manufacturers. At present, there are many types of welding machines on the market, which are applied to defect repair, and generally have the following types: E
What materials will be used in precision casting ? In precision casting, we can use stainless steel, carbon steel, alloy steel, etc., which can be used for precision casting. However, specific, it is still necessary to choose from specific situations. Precision casting, which can be referred to as precision casting , is a special casting method. In general, the parts obtained by precision casting do not need to be machined because they can obtain more accurate shapes and higher casting precision. However, we can also heat treat and cold work according to the needs of the product. The types of precision casting mainly include investment casting and pressure casting.
Performance and application of aluminum castings Cast aluminum alloy has the advantages that other aluminum castings can't match, such as aesthetics, light weight and corrosion resistance, which makes it popular among users. Especially since the automobile is lightweight, cast aluminum alloy castings have been obtained in the automotive industry. A wide range of applications. Cast aluminum alloys have a lower density than cast iron and cast steel, but have a higher specific strength. Therefore, the use of aluminum alloy castings under the same load conditions can reduce the weight of the structure, so aluminum alloy castings are widely used in the aviation industry and power machinery and transportation machinery manufacturing. Aluminum alloy has a good surface gloss and good corrosion resistance in the atmosphere and fresh water, so it has a wide range of applications in the manufacture of civilia
Casting properties and development direction of aluminum casting Aluminum castings have advantages that other castings cannot match during the manufacturing process. The products are very beautiful, light in weight and corrosion resistant. Aluminum casting are widely favored by users, especially since automobile lightweighting, casting Aluminum alloy castings are widely used in the automotive industry. The alloy density of aluminum castings is smaller than that of cast iron and cast steel. The strength of the whole product is relatively high. The aluminum alloy castings are used under the same load conditions, which can reduce the weight of the structure. Therefore, such products are transport machinery manufacturing and Wide range of applications in the aviation industry and other fields. Aluminum castings have a good surface gloss when used. The products have good corrosion resistance in the atmosp
6 key processes for stainless steel precision casting 1. Shooting wax group tree: pressure, temperature, repairing and grouping process 2, Coating: temperature, humidity, slurry viscosity, air drying time (especially surface, second, third) 3, dewaxing: temperature, time, concentration 4, roasting smelting: time, calcination temperature, molten steel temperature, impurity removal 5, pouring: slag, angle, speed (time) 6, shell removal: shot blasting
What are the factors affecting the machining accuracy of mechanical parts? When using lathe machining, operations such as driving, parking, cutting, reversing, spindle shifting and switch cutting are manually controlled; when CNC lathe machining is performed by automatic machine tools and profiling machines, the above operation and motion parameters are used. It is controlled by analog devices in the form of designed cams, cams and stops, and it can process more complicated parts with certain flexibility and versatility. However, the machining accuracy of the parts is affected by the manufacturing precision of the cam and the master, and the process preparation time is also long. In the mechanical parts processing industry, the accuracy requirements of the products are relatively high. So what are the factors affecting the machining accuracy of mechanical parts? Let me introduce you to the following sm
Precision machining features The main features of precision mechining parts processing: Precision automatic lathe, there are five sets of tool holders, each equipped with a minute card fine-tuning to achieve high precision of the workpiece; according to the workpiece processing process can be loaded with more than 10 knives. The two-axis device adopts an electromagnetic clutch to drive the tapping spindle, and uses the high-speed rotation and the mechanical spindle in the same direction to perform tapping. The two-axis can be shake-transformed, and the twisted hole and the inner and outer teeth can be processed at the same time. Since the five tools of the machine tool and the two tail shafts can work simultaneously during the machining process, the machine tool is 4 to 6 times faster than the CNC machine tool. Complex parts can be processed simultaneously on the outer c
The main cause of angry holes in stainless steel casting In the stainless steel casting process, the pore problem often occurs, which causes a lot of troubles for the casting processing. The pore is the bubble defect formed by the deposited gas in the ingot during the cooling and solidification of the metal liquid. Andrew will analyze the main causes of stomata below. 1. The permeability of the coating is poor or the negative pressure is insufficient. The gas permeability of the filling sand is poor, and the gas and residue in the cavity cannot be discharged in time, and the pores are formed under the filling pressure. 2, the pouring speed is too slow, can not fill the pouring cup, expose the sprue, entrapped in the air, inhaled the slag, forming the air hole and the slag hole. 3, the foam model gasification decomposition generates a large amount of gas and residues can not be d
Influence of wall thickness on casting quality Anyone who specializes in casting design knows that the wall thickness of die-casting parts has a great influence on the quality of stainless steel castings . The walls of castings are too thick and the walls are too thin. Therefore, the wall thickness should be reasonably designed when designing die-casting parts. The quality of the pressure-preserving casting is not affected by the wall thickness. Taking aluminum casting parts as an example, in general, thin-walled thick-walled die-casting parts have higher strength and better compactness. In view of this, the design of stainless steel castings should follow the principle of ensuring sufficient strength of the castings. As far as rigidity is concerned, the wall thickness should be reduced as much as possible and the wall thickness should be kept uniform. Practice has proved that the thickness of the die-cas
Silica sol casting process operation procedure Silica sol casting process operation procedure 1. Check whether the equipment and temperature control instrument are in normal working condition. 2. Pour the old wax liquid recovered from the dewaxing kettle into the filter tank for filtration; then send it to the static tank for 6-8 hours below 90 °C. 3. After the standing water is drained, the wax liquid is poured into the water removal bucket. 4. In addition to the wax liquid in the water tank, keep warm at 110-120 ° C and stir to let the residual water evaporate until the surface of the wax liquid has no foam. 5. The wax liquid except the water is filtered through a <60 mesh screen and placed in a static barrel of <90 ° C, and allowed to stand for more than 12 hours. 6. Each water bucket and static bucket should periodically drain the residual water and dirt at the bottom. 7. The recovered w
Investment precision casting process and advantages Investment precision casting process: firstly, it is necessary to select the appropriate investment material to make the investment mold; then repeat the refractory coating and the refractory sand process on the investment mold, harden the shell and dry; then melt the internal melting mold to obtain Cavity; calcined shell to obtain sufficient strength, and burn off residual investment material; cast the required metal material; solidification and cooling, sanding after shelling, to obtain high-precision finished products. The advantages of investment precision casting process: it is not only suitable for casting of various types and various alloys, but also produces castings with dimensional accuracy and surface quality higher than other casting methods, and even other casting methods are difficult to cas
Aluminum castings Aluminum casting is a kind of pressure casting part. It is a pressure casting mechanical die casting machine with a casting mold. The aluminum or aluminum alloy heated to liquid is poured into the inlet of the die casting machine, and die-cast by die casting machine. The shape and size of aluminum or aluminum alloy parts, such parts are often referred to as aluminum die castings. Aluminum die castings have different names in different places, such as aluminum die-cast parts, die-cast aluminum parts, die-cast aluminum parts, die-cast aluminum, aluminum castings, and aluminum alloy die-cast parts. Since metal aluminum and aluminum alloys have good fluidity and plasticity, and the casting process is cast in a pressure die casting machine, aluminum castings can be made into various complicated shapes and can also be made with higher precision and smoothness
To improve the level of precision casting technology, four points must be achieved. Although the development of China's foundry industry is in a relatively difficult period, from a long-term perspective, China's precision casting industry still has certain hopes for development, market demand has slowly begun to pick up, and coupled with China's foundry industry. The strength of the development has a strong strength, I believe that China's foundry industry will certainly achieve gratifying results. The technical support given by the national policy support and the establishment of the research base, as well as the cooperation relationship with the major institutions of higher learning, are the basis for the development of the foundry industry in China, which provides a solid foundation for the development of China's foundry industry to a certain extent. At the same time, it also provides strong s