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- Aluminum Die Casting Defects Case Study
Automotive engine oil pan 1, defects that appear The product is an essential part of the car engine, the working environment is harsh, and it is required not to leak oil. We mainly encounter the sensor hole air holes in the production of this product that can not meet the requirements, large plane local air holes into pepper powder, it is difficult to lift. 2, the reasons for the generation 1) Oil sump is a deep cavity part, aluminum liquid from the water mouth to the water tail, the process is long, easy to produce cold material. And the sensing air hole is an isolated part, which is not conducive to the discharge of cold material. 2) The principle of product die-casting release agent is manual spraying, the amount of spraying changes every time, and there are more unstable factors, causing the product to be easily deformed. 3) Bad exhaust. 3, Solution 1) Open a slag collection bag in the sensor part to facilitate the discharge of cold material in this part. 2) Use ABB robots to ensure stable and fast spraying. 3) Open an exhaust block on the mold to get the best exhaust effect. Thermostat housing 1, Defects that occur The product needs not to show water under high temperatures and pressure, so the sealing groove of the product is required to be very strict. Product sealing slot requirements do not allow air holes, such as in production, the end of the product often appear pepper-like air holes, will cause the product scrap; and the proportion of air leakage caused by more. 2, the reasons for the generation 1) complex structure of the product, more tabs in the middle, the aluminum liquid is not smooth in the flow, at the end of the product is easy to produce rolled gas. 2) The wall thickness of the product varies too much, the smallest place is only 4 mm, but the thickest place can reach 30 mm, and it is easy to produce shrinkage and shrinkage holes in the wall thickness. 3) There is an 85 mm long sliding block on the product, which is easy to pull on and crack the product, causing air leakage. 3, Improvement measures 1) Add a vacuum exhaust device to the mold to reduce the amount of gas in the mold cavity. 2) Open a partial extrusion pin at the product wall thickness to reduce the product shrinkage and shrinkage hole. 3) Make program changes to the machine, set core extraction spraying, and spray lubrication to the oblique extraction core to reduce the phenomenon of strain and cracking. Aluminum alloy base 1, defects The problem of casting inlet buckling, buckling crack, and deformation after cooling occurs during the trial production of the product. 2, Causes of occurrence 1) Casting heat sink with the thin and narrow wall, in order to cast water tail heat sink forming good and take high speed and high-pressure molding, resulting in a large impact on the inlet port buckling die buckling crack. 2) The casting is too long, uneven wall thickness, different crystallization strength of each part, and the shrinkage in cooling have different differences causing distortion and deformation. 3, improvement measures 1) Do surface cloaking treatment at the inlet of the mold to improve the buckling mold. 2) Take vacuum die-casting, not to reduce the inner gate speed and improve the internal quality when reducing the injection speed and pressure, so as to reduce the impact on the inlet port during the injection and improve the buckling mold. 3) Adopt cooling without water spout to reduce the deformation by pulling the casting during cooling. 4) Pre-align the product in the condition of semi-cooling of the casting, when the internal stress of the product is not completely released. Gear chamber 1, Defective problem Air leakage was found during product air inspection. 2, Cause Analysis The casting structure is complex, and in order to achieve a good appearance and required strength, the filling speed is up to about 60m/s and the specific pressure is more than 820kg/cm2. Therefore, a great impact on the part shown, so that the product surface burns, sticky aluminum; at the same time, due to the large difference in wall thickness of the part, the cooling rate is not the same and will lead to shrinkage, shrinkage crack, and these defects will lead to air leakage in the product in the gas inspection. 3, solution 1) Adopt point cooling method for die cooling in the corresponding part, which increases the local cooling effect; adopt local extrusion pin process to solve the problem of shrinkage. 2) Do surface cloaking treatment at the inlet of the mold to improve the buckling die and solve the burn. The gas station connection body 1, defect problem Casting both sides of the core extraction cavity buckling injury and lamination, the fixed mold forming surface of the two fixed columns has water lines or cold separation. 2, cause analysis 1) Due to the thin and long cores on both sides, the casting is wrapped by aluminum liquid, the temperature rises quickly, causing the cores to adhere to the inner cavity of the casting, and strains when taking off the mold. 2) After closing the mold, the core and the mold with a gap, resulting in feeding, forming a flying edge, after opening the mold, the core extraction, the flying edge can not be normal off, was caught in the mold, after closing the mold, the flying edge with the core inserted, the next filling, aluminum liquid in the flying edge on both sides of the molding, forming a sandwich. 3) The two fixed pillars on the molding surface of the fixed mold extend into the mold 35 mm, and are slender, with cooling water inside the mold, the top of the pillar is closer to the cooling water channel, after opening the mold, the pillar position cools down faster, and when spraying, the mold release agent is easy to remain because of the small space in the cavity of the pillar. 3, Solution 1) Install additional cooling points inside the extractor core on both sides of the mold to take away the heat from the end properly. 2) Polish the surface of the extractor core to stick to aluminum and cloak it to prevent the flying edge from sticking. Enable deceleration, deceleration position 525 mm to prevent flying edge. 3) Open 1/3 of the cooling water at the two pillars after normal, reduce the mold temperature appropriately, and blow out the residual mold release agent in the inner cavity after spraying in the fixed mold.
- Factors Affecting the Size of Die Castings
Factors affecting the size of die castings are broadly the following. 1, molding compression is caused by the size of the error. Molding shrinkage is the main factor affecting the size of die castings. Because molding compression is a complex process, so the shrinkage rate has a wide range of choices. According to the external shape of the die casting and structural characteristics, respectively, select the size of each part of the appropriate molding shrinkage and determine the size of the molding, is to ensure that the die casting size accuracy of the key issues. 2, the manufacturing error of molding parts. 2.1, the molding parts of the insert, mold processing datum, and the impact of processing technology. 2.2, machining errors of molded parts. 2.3, assembly errors of molded parts. 2.4, the error caused by the slope of the molded parts of the mold. 3, the influence of fluctuations in molding shrinkage during die-casting. 3.1, the influence of die-casting molding process parameters, such as press injection ratio pressure and internal gate speed. 3.2, the effect of mold temperature. 3.3, the effect of the temperature of the die casting when the mold is removed. Die castings in the shrinkage process, broadly divided into the following three stages. a, liquid shrinkage, after die casting, still in the liquid metal liquid temperature reduction caused by shrinkage; b, solidification shrinkage, in the cooling and solidification process, the metal liquid from the liquid to solid crystallization stage shrinkage; c, solid shrinkage, metal completely solidified when the crystallization is completed stage and out of the mold body shrinkage. In die casting, because the superheat temperature of the metal liquid is not high, so the volume shrinkage in the liquid shrinkage stage is not large; shrinkage in the solidification stage, although larger, but is completed in the mold forming parts, and therefore by the molding parts, especially the core of the resistance limit. When the die-casting die temperature decreases and can reach the temperature of the mold, die castings from the mold body, only after the free shrinkage state, that is, the solid-state shrinkage stage. This shrinkage process has continued until the die casting reaches room temperature before the basic end. Therefore, it can be said that the temperature of the mold of the final shrinkage of the die casting plays an important role in determining the amount. 4, the error caused by the phase time movement of the structural parts. 4.1, mold closing errors. 4.2, the movement error of the side-drawing core and the movable core. 4.3, the error caused by the precision of the die-casting machine and the instability of the process performance. 5, punching error. 5.1, molding parts by the impact of pressure injection deformation caused by the error. 5.2, forming parts surface by the metal liquid or impurity erosion generated by the error. 5.3, subject to pressure injection stamping, template, or forming parts to produce elastic deformation or plastic deformation and the formation of forming part of the size error.
- Design for Die Casting Mold of Middle Shell Side Gating
1, structural process analysis of die casting 1.1 The reasonable choice of materials used in die casting. Aluminum alloy because of its good die-casting performance, specific strength, and specific stiffness is high, high and low-temperature mechanical properties are also good, its surface has a dense oxide film, and certain corrosion resistance and in the production of die castings are used in large quantities, widely. 1.2 The minimum wall thickness of the die casting is 3mm, and the minimum wall thickness is also by the process requirements, and the 3mm*54mm rib on the two long sides, 8mm*4mm rectangular hole, R4mm flange, etc. are also by the requirements of the die casting process. 1.3 Because of the strong affinity between aluminum alloy and iron at high temperatures, it is easy to bond with the pressure chamber, and the die-casting mold design should use a cold chamber die-casting machine as far as possible. 2, the choice of parting surface According to the middle shell for the long frame hollow parts, both sides of the long side have different side convex, step, small rectangular hole structure characteristics. The die casting parting surface of this die casting, except for the horizontal parting between the moving die and the fixed die, is chosen in the upper face of the shell, and the forming of both long sides needs to adopt the lateral parting mold structure form (i.e. the form of lateral core extraction of the inclined pin slider). 3, the determination of the pouring system Due to the thin wall thickness of the four sides of the intermediate shell and the difference between the plant and width dimensions, to prevent cold separation and ensure the thermal balance of the mold, the pouring system uses side gates. The molten alloy is pressed in simultaneously from both ends of the long side of the casting, and a larger overflow slot is set at the part where the metal liquid meets or is likely to produce eddy currents. A larger overflow slot can be set both exhaust role and can set slag and conducive to the thermal balance of the mold. 4, the choice of die-casting machine The middle shell is no insert die-casting, can choose horizontal cold room die-casting machine, according to the actual production of enterprises to choose the appropriate die-casting machine, to meet the actual production requirements. 5, die-casting mold forming parts working size calculation and determination By die-casting alloy comprehensive shrinkage rate list data can be seen: aluminum alloy shrinkage rate in the free shrinkage rate of 0.50%-0.75%; hindered shrinkage rate of 0.40%-0.65%. After separate analysis and calculation, it is determined. 6, die-casting process protocol The process protocol is mainly to determine the process parameters of die-casting production. Die-casting production process parameters mainly include die-casting with new, old material reasonable ratio (old material is impossible to abandon, new, old material unreasonable ratio will affect the material performance and shrinkage rate), determine the die-casting production process protocol, equipment, the correct use of paint (because it has the role of improving the working conditions of the mold, improve molding conditions, improve the quality of castings and extend the life of the mold and essential), etc. 7, die-casting mold assembly design There are two structural options in the design of die assembly. Program one: die-casting forming castings, the shape of the inner cavity mold forming part are designed into the form of the overall structure; program two: forming castings, the shape of the mold work parts are designed into the set, set block set combination of structural form. After analysis and comparison, although program one uses less material, good strength, short processing cycle, but the mold manufacturing accuracy is difficult to ensure that the mold damage and wear are not easy to repair. While the second option increases the use of alloy steel, the processing cycle is extended, but the precision of the working parts of the mold is easy to ensure, and the size adjustment of the working parts of the mold and the wear and damage formed after a certain period of production is also convenient to repair and replace. In the assembly structure of the mold, the fixed mold insert and the fixed mold insert of the fixed mold part are set into the fixed mold plate in the form of grouping. For the moving side, the moving die insert and the moving die insert are inserted into the moving template in a group. The die plate is made of medium carbon steel. The working parts are made of hot work die steel for die casting, the strength, and processing accuracy of the die can be guaranteed, and the adjustment of each forming size is also convenient. Because the hollow shell of die casting has long sides of rectangular holes, flanges, convex tendons, and other structures respectively. So both sides need to use different slider structure forming, tilt pin core parting, wedge tight block locking lateral forming form. Considering the thin wall thickness around the middle shell, and the size of the overflow groove has been enlarged, so pushrods are set on the overflow groove and the cross sprue, and 8 rectangular sheet pushrods are set on both sides of the long side of the die casting to ensure the smooth and synchronous launch of the overflow groove, cross sprue and die casting. The mold is reset by the reset rod to push the pushrod fixed plate to reset.
- CAMEL DIE | Die Casting Mold Factory In China
OVER 10 YEARS OF DIE CASTING MOLDS BUILDING DIE CASTING MOLDS FACTORY OUR PHILOSOPHY Reduce Cost REDUCE COST We focus on building quality die casting dies and trim tools to help the customer save costs for many years. OPTIMAL CYCLE-TIME OPTIMAL CYCLE-TIME It's Our job that develop and build dies that support best-in-class cycle-time, part quality, and the longer die life. EFFECTIVE COMMUNICATION EFFECTIVE COMMUNICATION Our engineers fully understand the mold industry and how to communicate effectively with your clients. EASY MAINTENANCE EASY MAINTENANCE We deeply believe that good mold maintenance ensures a longer mold life and smooth production. HIGH-QUALITY PRODUCTION HIGH-QUALITY PRODUCTION More than 10 years of experience work in the mold industry, Build over 240 sets of molds per year. SHORT LEAD-TIME SHORT LEAD-TIME 100% Export business from China to Europe and American, Professional shipping personnel to solve various cross-border transportation services. TEAM CO-DESIGN TEAM CO-DESIGN We communicate with the client about each specific matter and then meet to discuss the design plan until the best plan is reached. AVOID RISK AVOID RISK We strictly control each phase of the processes and conduct staff safety training to ensure safe work and reduce processing risks. PROJECT MANAGEMENT We operate every step in strict accordance with or even beyond industry regulations and ERP system process specifications. 24/7 Hours Online Pre-sales Service 1. Request For Quote 2. Design For Manufacturing 3. Flow Simulation & FEM 4. Mold Design 5. Engineering Work 6. Quality Control 7. Sampling 8. Inspection Report 9. Maintenance 10. Shipment Global After-sales Service ABOUT US SHENZHEN CAMEL DIE LIMITED is a professional die casting mold manufacturer and supplier founded in 2009, China, provides high-quality die casting mold design , stable mold development , and mold production export from China to North America & Europe. One of the worldwide leading mold manufacturers specializing in high pressure die casting (HPDC) mold build in-house. Currently, our factory has 15 sets of CNC machines and the primary material covers aluminum alloy , zinc alloy , and magnesium alloy . In addition, one-stop manufacturing service for all industrial applications, such as automotive, telecom equipment, electrical appliances, mechanical, motorcycle accessories, lighting, home appliances, medical instruments, aerospace, and machinery industries, etc. Our first factory located in Dongguan city with 5,400 square meters for mold building , supplies a capacity of around 285 sets per year. And the second factory, estimated in 2019 located in Huizhou city with 6,100 square meters to make tools and dies about 240 sets of large molds per year. Essential equipment for die casting mold manufacture including CNC, EDM, WEDM, Fixtures, CMM, OMM, die spotting machine, oil temperature machine, and mold trial machine. We are also ISO 9001:2015 and IATF 16949:2016 certificate plant. OUR PERFORMANCE 97.14% On-Time Delivery 240 Sets Average Annual Capacity 24- Hours Hotline Service 9 Locations Global After Service
- Die Casting Mold For Magnesium Alloy | cameldie.com
HPDC - Magnesium Alloy Die Casting Molds Magnesium Alloy is the lightest commonly used structural metal. Its use in die cast parts has grown dramatically, often replacing plastic parts with greater strength and rigidity at no weight penalty. Mg alloy AZ91D is the most widely-used magnesium die casting alloy, offering high purity with excellent corrosion resistance, excellent strength, and excellent castability. Corrosion resistance in AZ91D is achieved by enforcing strict limits on metallic impurities. Magnesium’s high cost limits it to weight-sensitive applications in the aerospace and automotive industries. Commonly used magnesium die casting alloys metals grades: AZ91D, AZ31B, AZ40, AZ41, AM60B, AM50A, etc. The Main Physical Of Magnesium Alloys As Below: ●AZ91D belongs to the category of cast magnesium alloy, which has a low affinity with iron, less mold sticking, and has a longer mold life than aluminum alloy. Magnesium alloy is the lightest metal among practical metals, with high strength and high rigidity. It is mostly used in lightweight parts such as automobile instrument panel frame, wiper bracket, bicycle wheel hub, steering wheel frame, etc. Magnesium alloy die castings are mainly processed by die casting assisted by subsequent processing, and the appearance can be changed by surface methods such as electrophoresis. ●AZ31B magnesium alloy is a wrought magnesium alloy with good mechanical properties and is mainly used for automobile parts, machine parts, and communication equipment. ●AZ40 magnesium alloy product use: engine gear casing, oil pump and oil pipe, instrument panel, gearbox body, crankcase, engine front cover, cylinder head, air conditioner casing, etc. ●AZ41 magnesium alloy has high strength and hardness, electrical and thermal conductivity, good wear resistance, and wear resistance. After aging treatment, the hardness, strength, electrical conductivity, and thermal conductivity are significantly improved, and it is easy to weld. ● AM60B has high elongation and impact resistance. Steering wheels and seats on cars, etc. ●AM50A has high elongation and impact resistance. Steering wheels and seats on cars, etc. Magnesium alloy die casting die life depends upon the part/tool design, as well as the Tool steels used. Commonly mold steels are used: H-13, H-13, ESR, Assab 8407, Bohler W302, and Assab 8418. etc. CAMEL is a professional high-pressure die-casting molds (HPDC) manufacturer in China, The main products include aluminum alloy die-casting molds, zinc alloy die-casting molds, and magnesium alloy die-casting molds. From tools design & build to die casting parts pre & mass production. The main industries we support are Automotive Industry, Motorcycle Industry, Aerospace Industry, Office furniture Industry, Lock Industry, Electrical Industry, Lighting Industry, Casino Industry, Home Appliances Industry, Machinery Industry, Communications Industry, and Others. Capabilities: Currently, We occupy 54,000 square feet with a workshop plant located at Huizhou City, And another plant 49,000 square feet workshop plant located at Dongguan City, China. Quantities of Major Machines： 15 sets of CNC Machining Centers 5 sets of EDM Machining 2 sets of Wire cutting 2 sets of CMM 2 sets of Projector 2 sets of Spot Machine Take care of all projects according to the mold projects management system. DFM ( 2 days) Moldflow Analysis (24 Hours) Mold Design (2-3 days) Weekly Tooling Schedule Mold Trial Mold Shipment Die Casting Molds We Build: Trimming Die High-Pressure Zinc alloy die casting mold High-Pressure Aluminum alloy die casting mold High-Pressure Magnesium alloy die casting mold Free Quote & Part Analysis →
- Zinc Die Casting Mold | cameldie.com
What is High Pressure Zinc Alloy Die Casting Molds The zinc die casting parts can reach a tolerance: 0.01mm~0.03mm as a requirement. It can be used in a wide range of industries. Like: Toys, lamps, decorations, Auto parts, Electromechanical parts, mechanical parts, electrical components, etc. Zinc alloy material with a low melting point, good fluidity, high strength, high hardness, high precision, and stability. Zinc die parts have good thin wall capability for mass production, and high corrosion resistance. Therefore, zinc alloy die casting is an ideal alternative to many industrial component materials. Commonly used zinc alloy grades: Zn 1#, Zn 2#, Zn 3#, Zn 5#, Zamak8#, etc. The Main Physical Characteristics Are As Below: Currently, We occupy 54,000 square feet with a workshop plant located at Huizhou City, And another plant 49,000 square foot workshop plant located at Dongguan City, China. Quantities of Major Machines： 15 sets of CNC Machining Centers 5 sets of EDM Machining 2 sets of Wire cutting 2 sets of CMM 2 sets of Projector 2 sets of Spot Machine Zinc alloy dies casting mold life depends upon the part/tool design, as well as the Tool steels used. Commonly Mold Steels Used: H-13, H-13, ESR, Assab 8407, Bohler W302, and Assab 8418. etc. Take care all projects according to mold projects management system. CAMEL has been provided zinc die casting molds from custom zinc die casting tooling to middle-sized zinc die casting parts production, meanwhile including surface treatments service based on customers’ requirements, such as Plating chrome, Plating Tarnish, UV Coating, Powder coating, Painting, Anodizing, Blacking, Impregnating, etc. We run all metal products under ISO 9001:2015 and IATF 16949:2016. Die casting machines for mold trials ranging from 280 tons to 3000 tons ( 280T, 350T, 500T, 800T, 1250T,1650T, 3000T), Our capability from tooling design to build dies about 12-15 sets of big die casting dies per month. DFM ( 2 days) Moldflow Analysis (24 Hours) Mold Design (2-3 days) Weekly Tooling Schedule Mold Trial Mold Shipment Free Quote & Part Analysis → Die Casting Molds We Build: Trimming Die High-Pressure Zinc alloy die casting mold High-Pressure Aluminum alloy die casting mold High-Pressure Magnesium alloy die casting mold