How to buy cold chamber die casting machine ? The selection of die casting machine is usually based on the clamping force, injection quantity and casting area. 1、 Determine the clamping force of alloy die casting machine The clamping force is the first parameter to be determined when selecting the die casting machine. The function of mold locking force is mainly to overcome the mold expansion force in the mold cavity, lock the parting surface of the mold, prevent liquid metal splashing and ensure the dimensional accuracy of the casting. The die locking force of the automatic high precision die casting machine is calculated as follows: F=k × p × s F --- calculate clamping force K --- safety factor P --- injection specific pressure S -- projected area The safety factor K is related to the complexity of the casting and the die casting process. It is generally taken as 1-1.3. For thin-walled complex castings, the parting surface of the die is greatly impacted due to the high injection speed, injection specific pressure and die temperature. Therefore, K should be taken as the larger value, and vice versa. II. Determine the injection quantity of the machine Injection quantity is an important parameter of intelligent die casting machine. It is the most permanent parameter when selecting the die casting machine, expressed in kilograms. Select a die casting machine with sufficient injection quantity - a die casting machine with injection quantity just equal to the blank weight of die casting parts shall not be selected. The usual choice is that the weight of die-casting blank should account for 25% - 85% of the injection volume. III. determine the projected area of parts The projection area is an important parameter for die casting model selection. The projection area mentioned here is not only the area of parts, but also the area of garbage bin and nozzle. The area estimation is generally obtained by dividing the clamping force by the injection specific pressure during die casting. For the existing beer pieces, the calculation of casting area should be divided into small regular shapes. (1) calculation of s of circle area with diameter D: S= Л d2/4 (2) calculation of square area s with side length a: S = A2 (3) calculation of rectangular area s with length a and width B: S = ab (4) calculation of trapezoidal area s with upper bottom a, lower bottom B and height H: S = (a + b) H / 2

cold chamber die casting machine pressure die casting machine refers to the application of about 2 times of high pressure [500-1500 kg / cm] to the final pressure of document speed injection in a very short time {MS setting conditions} after the injection. Therefore, it does not refer to the pressure value above, but to what device can effectively increase the pressure to higher than the high-speed final pressure to achieve the effect of pressurization. The final casting pressure refers to the pressure after about 0.3 seconds after the completion of injection, whether pressurized or not. Generally, the purpose of effective pressurization to improve the final casting pressure is to forcibly squeeze the liquid metal from the solidification shrinkage part that is rapidly solidified after filling the forming part, so as to prevent the so-called depression. At the same time, the residual pores and pin holes that are not removed from the forming part are compressed with high pressure to make them smaller. In order to achieve these two purposes, the higher the final pressure, the better the effect, but the higher the final pressure, the smaller the casting projection area. Therefore, larger casting machines and stronger molds are needed, which brings economic problems, so the range of 500-800 kg / cm is enough. In order to make full use of the pressurization effect, the time to rise to the final pressure after high-speed filling, that is, the pressurization rise time, is very important. Theoretically, pressurization should be maintained from the beginning of solidification to the end of solidification. If flash splashing occurs too early, and if the gate solidifies too late, it is impossible to replenish and pressurize the liquid metal at the forming part. In practical production, the pressurization rise time of medium pressure caster is generally set at 10-30ms. The pressurization device varies with the die casting machine manufacturer. Toshiba and Toyo machines only need to read the pressure gauge of the injection cylinder to see the difference between the pressure when the pressurization is effective and invalid. However, when the pressurization of Yubu machine is invalid, the pressure on the hydraulic oil supply side is the same as that on the discharge side. The pressure on the discharge side is called back pressure. When the back pressure is 0, it is 100% pressurized, and the pressure on the discharge side is above 0, When the supply side is below the pressure, it is the effective percentage of pressurization. The final pressure can be seen from the operating manual of the machine. alloy die casting machine It is occasionally seen at the casting site that flash is ejected every time, because the casting area is too large. When the flash is ejected, the casting area shall be confirmed immediately, and the allowable pressure value shall be calculated with the following formula Allowable pressure value kg / C ㎡ = clamping force kg × 0 9／casting area ...

aluminium alloy cold chamber die casting machine In die casting, the die is filled under the pressure of 15 ~ 120MPa. Pressure always works during solidification. Pressure is generated in the casting machine and applied to the melt through the piston, and the piston slurry molten metal is injected into the mold. By this method, castings with wall thickness less than 1mm and sharp edges can be produced. Higher casting pressure leads to higher metal flow viscosity (10 ~ 150m / a) and shorter filling time (150 ~ 20ms). This also means that when gradually in contact with the die surface, although the cooling speed is very fast, it will not solidify until the die is fully filled. For this reason, the best mold filling is very important. The high pressure acting on the die surface will also produce pressure to separate the two half dies, which is opposite to the corresponding "locking force". These forces put a great load on the die. Unlike in re cold casting, hot working steel, small box and solid die with stable clamping frame need to be used. The hydraulic unit associated with the machine is equipped with a high-pressure reservoir, and the control of the machine requires extensive automation. All this doubles the cost of machinery and tools. The high dimensional accuracy and surface properties of production, together with high output, make this process more economical, especially for long-term processes. These are also the reasons why and die casting are more widely used in aluminum alloys than other casting processes. The load of all die parts increases the pressure of the casting, so the sand core can not exceed a specific temperature (higher than that in low-pressure die casting). The metal core must be pulled out to allow the casting to be taken out of the mold. It cannot be used as a groove in practice, which also limits the design of die castings. However, in many cases, appropriate methods can be found to make up for this defect. Die casting has the following advantages: Very high dimensional accuracy is possible in casting parts with small tolerances; Lower mechanical tolerances and less machining are required; It can produce hollow cylindrical precision castings, such as bearing bodies, narrow drilled precision castings and castings engraved on castings; Thin wall gradually; Clean and polish the surface; aluminium alloy die casting machine: High productivity and short production time; die casting machine: Automated production.

Compressors are classified as follows according to different structural forms: according to their principles, they can be divided into: Reciprocating piston compressor, rotary compressor (turbine, water ring, turbine) compressor, axial compressor, jet compressor and screw compressor, among which reciprocating piston compressor is the most widely used. How are piston compressors classified ？ There are many classification methods and different names for piston compressor. There are usually the following classification methods: 1.According to the cylinder position (cylinder centerline) of the compressor, it can be divided into: (1) Horizontal compressor, all cylinders are horizontal (the center line of the cylinder is horizontal). (2) Vertical compressor cylinders are arranged vertically (vertical compressor). (3) For angular compressor, the cylinder is arranged in different angles such as L-type, V-type, W-type and star type. 2. According to the number of compressor cylinder sections (stages), it can be divided into: (1) Single stage compressor (single stage): the gas is compressed once in the cylinder. (2) Double stage compressor (two stages): the gas is compressed twice in the cylinder. (3) Multistage compressor (multistage): the gas is compressed many times in the cylinder. 3.According to the arrangement method of cylinders, they can be divided into: (1) Tandem compressor: multi-stage compressor with several cylinders arranged on the same shaft in turn, also known as single row compressor. (2) Parallel compressor: multi-stage compressor with several cylinders arranged in parallel on several shafts, also known as double row compressor or multi row compressor. (3) Compound compressor: a multi-stage compressor composed of series and parallel. (4) Symmetrical balanced compressor: the cylinders are arranged horizontally on both sides of the crankshaft whose journals are 180 degrees from each other, arranged in H-shape, and their inertial force can be basically balanced. (large compressors are developing in this direction). 4.According to the compression action of the piston, it can be divided into: (1) Single acting compressor: gas is compressed only on one side of the piston, also known as single acting compressor. (2) Double acting compressor: gas can be compressed on both sides of the piston, also known as compound or multi action compressor. (3) Multi cylinder single acting compressor: it uses one side of the piston for compression, while the compressor with multiple cylinders. (4) Multi cylinder double acting compressor: the two sides of the piston are used for compression, while the compressor with multiple cylinders. 5. According to the final discharge pressure of the compressor, it can be divided into: (1) Low pressure compressor: the end discharge pressure is 3 ~ 10 gauge pressure. (2) Medium pressure compressor: the final discharge pressure is 10 ~ 100 gauge pressure. (3) High pressure compressor: the final discharge pressure is 100 ~ 1000 ...

1. What are the main parts of the die casting machine? Answer: the die casting machine is mainly composed of closing mechanism, injection mechanism, ejection mechanism, power (hydraulic) system, control system It is composed of lubrication system, cooling system, etc. 2．What is the tonnage of die casting machine named after? A: the tonnage of die casting machine is named after the maximum clamping force (clamping force). For example, 180t die casting machine, its maximum clamping force is 180 tons. 3. What is the function of the closing mechanism of the die casting machine? Answer: the function of the closing mechanism is to install and fix the die and drive the moving die of the die-casting die to open or close the die. 4. What is the nominal pressure of the hydraulic system of the horizontal die casting machine? A: it is 12 MPa (or 120 kg / cm2). 5. What is the function of the injection mechanism? A: the injection mechanism is a key part of the die-casting process, which makes the metal liquid fill into the mold cavity at a certain speed and pressure from the injection chamber. 6. What are the cyclic action steps of the injection punch during normal production? Answer: the steps are: slow speed (from the beginning of the injection head to crossing the pouring port of the injection chamber)cold chamber die casting machine A rapid (the injection head allows the liquid metal to enter the runner and sprue) II. Fast (make the liquid metal go straight into the inner gate from the beginning to fill the mold cavity) Pressurization (when the liquid metal fills the mold cavity, the pressure of the injection cylinder increases rapidly to a certain value, and the filler metal is compacted and maintained for a period of time)horizontal die casting machine Tracking (at the same time of mold opening, the injection head continues to move forward some distance with the surplus material of gate sleeve) Return (the ejector head returns to the original state and completes a cycle) 7. What are the basic technical parameters of horizontal cold chamber die casting machine produced in China? Answer: there are (1) clamping force (KN), (2) injection force (KN), (3) jacking force (KN), (4) jacking stroke (mm), (5) moving formwork stroke (mm), (6) die thickness (mm), (7) injection chamber diameter (mm), (8) injection specific pressure (MPA), (9) maximum projected area of casting (cm2), (10) maximum metal pouring volume (aluminum alloy) (kg) (11) Working pressure of the system (MPA), (12) spacing within the column (mm), (13) main motor power (kw). 8. What process parameters can be adjusted during die casting production? Answer: (1) mold thickness, (2) mold closing speed, (3) mold opening speed, (4) mold closing time, (5) slow injection, (6) fast injection, (3) slow injection stroke, (8) fast injection stroke, (9) injection pressure (specific pressure), (10) tracking stroke, (11) tracking delay, (12) ejection stroke, (13) ejection speed, (14) ejection delay, (15) Cycle...

1. What parts does the die casting machine die consist of? A: the structure of the die casting die can be divided into the following parts according to its function: (as shown below)aluminum die casting machines  (1)Molding part (dynamic and fixed die casting mold core, molding insert, core pulling, etc.) (2) Mold base part (movable and fixed mold clamping plate, AB plate, supporting plate and mold foot) (3) Bypass system (gate sleeve, splitter cone, runner, inlet bypass) (4) Overflow system (overflow tank, steam exhaust tank) (5) Ejector mechanism (ejector pin, ejector pin fixing plate, ejector plate, reset lever) (6) Guide parts (guide post, guide sleeve, middle guide post, middle guide sleeve) (7) Core pulling mechanism (core pulling slider, inclined guide post, clamping block, spring, etc.) (8) Others (cooling system, heating system, reinforcing column, etc.) 2. What material is the die casting die made of? Answer: the die casting die of our company is mainly made of the following Steels: (1) H13 (heat resistant steel) as front and rear mold core, core pulling core, gate sleeve, shunting cone, etc.) (2) 45 steel (as a and B plates, sliding blocks, inclined guide posts, etc.) (3) T8, T10 (guide post, guide sleeve, thimble, reset rod, etc.) (4) A3 steel (front and rear die clamping plates, supporting plates, thimble plates, die feet, etc.) 3. What is the heat treatment hardness of die casting machine die core? What are the consequences of being too soft and too hard? Answer: the maximum hardness of mold core heat treatment is hrc45 ~ 48. If the treatment is too soft (lower than hrc43), the die core is easy to collapse, deform and stick during die production; If the treatment is too hard (higher than HRC50), the mold core is easy to crack. After nitriding, the hardness of some parts will reach hrc58-60 (such as gate sleeve, insert, etc.). 4. What are the factors considered when selecting the die casting machine for the die casting die? Answer: (1) mold installation (i.e. whether the die casting machine can fit the mold is related to the distance between the inner rod of the Golin column and the position of the pressure chamber); (2) Pouring amount of molten metal (whether the capacity of injection chamber of die casting machine is sufficient); (3) Clamping force (when setting a reasonable specific pressure, the clamping force is enough to lock the mold); (4) Injection specific pressure (to ensure casting quality); (5) Mold opening stroke (able to take out the product).

1. What is die casting? A: pressure casting is referred to as die casting for short. Die casting is the process of rapidly filling the mold cavity with liquid metal under pressure, changing from liquid to solid to form the required products. 2. What are the types of die casting? A: the injection chamber can be divided into hot chamber die casting (commonly used for zinc alloy) and cold chamber die casting (commonly used for aluminum alloy). The pressure can be divided into low-pressure casting (such as automobile wheel shell) and pressure casting (such as pressure casting in our company). The exhaust mode can be divided into ordinary die casting and vacuum die casting. 3. What are the die casting alloy materials? What are their characteristics? A: the commonly used materials suitable for die casting are zinc alloy, aluminum alloy, magnesium alloy and copper alloy. They have the following characteristics: 1). good fluidity in liquid state; 2). Relatively fixed melting point and freezing point; 3). small shrinkage; 4). it has certain high temperature strength; 5). it has good processability and corrosion resistance. 4. What are the main components of die cast aluminum alloy? What are the impurities ? A: the main ingredients are: aluminum, silicon, copper, magnesium, manganese, zinc, etc. Impurities include: iron, zinc, copper, tin, aluminum, sulfur, phosphorus, etc. Different alloy grades have different requirements for their main components and impurity components. 5. What are the main defects of die castings? A: there are under casting (insufficient material), cracks, deformation, cold separation, cold lines, shrinkage, pores (sand holes), mechanical strain, die sticking strain, delamination, wrong die, slag inclusion, surface cavitation, blistering, fleshy, lack of meat, etc. 6. What is the temperature of aluminum alloy liquid suitable for die casting production? Answer: 650 ℃ ~ 720 ℃ 7.What are the characteristics of die casting production? Answer: (1) high production efficiency, which can realize mechanized or automatic production; (2) Good product quality: A. high dimensional accuracy and high surface finish; B. Good mechanical properties; C. Good interchangeability; D. The contour is clear, the casting wall is thin and complex, and the pattern, pattern and text can obtain high definition; (3) Good economic effect: A. excellent economic indicators; B. Low cost of die castings; C. It can be used as part combination; (4) The investment cost of die casting equipment and mould is high, which is not suitable for small batch production.

In accordance with the spirit of the National Day holiday notice of the General Office of the State Council, combined with the actual situation of Bengbu Longhua Die Casting Machine Co., Ltd., after research and decision, the holiday arrangements for the National Day holiday in 2021 are as follows: It will be closed from October 1st to 7th for a total of 7 days. Officially went to work on October 8. 1. The National Day holiday is arranged for a long time. You can arrange to travel and visit relatives and friends. I hope that all colleagues can completely relax themselves during the long holiday so that they can devote themselves to work after the long holiday. 2. The company's security personnel must do the company's security work during the holiday season, patrol from time to time, and report suspicious phenomena in time. 3. All departments must do a good job of safety self-inspection before the holiday, put an end to all sources of fire, turn off the power supply, lock the doors and windows, and ensure safety after leaving the holiday. 4. During the holidays, all departments shall properly arrange the personnel on duty, and the list of personnel on duty shall be reported to the Personnel Department in time. 5. During the holiday, I hope my colleagues can pay attention to the safety of traffic, personal and property. Finally, I wish you all a safe and happy National Day holiday. Bengbu Longhua Die Casting Machine Co., Ltd.