What is the difference between a hot chamber die casting machine and a cold chamber die casting machine?

Die-casting machines are generally divided into two categories: hot-chamber die-casting machines and cold-chamber die-casting machines. Cold chamber die casting machines are divided into horizontal die casting machines and vertical die casting machines (including full vertical die casting machines) according to their chamber structure and arrangement.

The pressure chamber of the hot-pressing chamber die-casting machine (referred to as the hot-air die-casting machine) is immersed in the liquid metal of the heat preservation and melting crucible, and the injection part is not directly connected to the machine base, but is installed on the crucible. The advantages of this type of die casting machine are that the production process is simple, the efficiency is high, the metal consumption is low, and the process is stable. However, the pressure chamber and the injection punch are immersed in liquid metal for a long time, which affects the service life. And it is easy to increase the iron content of the alloy. Most of the hot-chamber die-casting machines are currently used for die-casting low-melting-point alloy castings such as zinc alloys, but they are also used for die-casting small aluminum and magnesium alloy die-castings.

What is the difference between a hot and cold chamber die casting machine and a cold chamber die casting machine?

Die-casting machines are generally divided into two categories: hot-chamber die-casting machines and cold-chamber die-casting machines. Cold chamber die casting machines are divided into horizontal die casting machines and vertical die casting machines (including full vertical die casting machines) according to their chamber structure and arrangement.

The pressure chamber of the hot-pressing chamber die-casting machine (referred to as the hot-air die-casting machine) is immersed in the liquid metal of the heat preservation and melting crucible, and the injection part is not directly connected to the machine base, but is installed on the crucible. The advantages of this type of die casting machine are that the production process is simple, the efficiency is high, the metal consumption is low, and the process is stable. However, the pressure chamber and the injection punch are immersed in liquid metal for a long time, which affects the service life. And it is easy to increase the iron content of the alloy. Most of the hot-chamber die-casting machines are currently used for die-casting low-melting-point alloy castings such as zinc alloys, but they are also used for die-casting small aluminum and magnesium alloy die-castings.

The pressure chamber of the cold chamber die casting machine is separate from the holding furnace. During die casting, the liquid metal is taken out of the holding furnace and poured into the pressure chamber for die casting.

1. In terms of structure: the main difference between the hot chamber die casting machine and the cold chamber die casting machine is the injection part. The pressure chamber and the sweet pot of the hot chamber die casting machine are connected together; Separately, it relies on the manipulator of the automatic soup feeder to scoop the molten metal from the crucible into the trough.

The hammer head of the cold room machine is empty, and cooling water flows through it.

2. In terms of performance: the melting point of the metal of the hot chamber die casting machine is low, the production efficiency is the same, the casting quality is high, and the quality stability of the casting is high, (usually die-casting zinc alloy); the melting point of the metal of the cold chamber die casting machine is high, the production efficiency is low, and the casting Low quality stability (usually applicable to aluminum alloys, magnesium alloys, copper alloys).

Why is the noise different from normal after adjusting the total pressure, the noise is very loud, and the pressure gauge oil pipe vibrates strongly? The model is a 7.5T hot-type old die-casting machine

It may be that your line type is not adjusted properly.

In fact, there are many problems with die casting machines.

In fact, there are many problems with the die-casting machine. Especially some considered faults are more troublesome, so everyone must be very careful and pay attention when operating the die-casting machine.

The key to eliminating these faults is to distinguish whether it belongs to electrical, hydraulic or mechanical faults. Common faults of die casting machines are: ineffective action, no action, no pressure, action error, etc. Mastering the structure and working principle of the die-casting machine as well as the input and output conditions related to each action, the working principle of the hydraulic system of the die-casting machine, and the pressure and speed adjustment methods are the basis for troubleshooting. Any abnormal sound, loose fasteners, deformation of parts, and abnormal displacement need to be checked and repaired in time. The following focuses on the analysis and introduction of the possible causes and elimination of 10 common fault phenomena of hot die casting machines.

The working conditions are relatively bad, because the hot die-casting machine works under high temperature, high pressure and high speed. After working continuously for a long time, it is inevitable that there will be failures, such as abnormal noise, unstable movement, or even the machine stops at a certain position and the cycle cannot continue. Once these faults appear, the operator should pay great attention, observe carefully, determine the location and possible causes of the fault, and eliminate the fault in time to ensure normal production. For the general PLC-controlled die-casting machine, since there is no fault reveal, it can only be judged according to the phenomenon before and after the fault and the conditions required by the PLC control sequence, and it is more difficult to troubleshoot the fault; for the PC-controlled die-casting machine, due to the relatively Rich self-diagnosis functions, namely fault revealing and monitoring and alarming functions, under normal circumstances, the alarm is related to the monitored part, which is easier to diagnose and handle. In short, once the die-casting machine fails, the operator or maintainer needs to conduct a comprehensive analysis in time to find the cause and eliminate it.

Die casting machine failure: hydraulic pump cannot start

Inspection and analysis: Press the hydraulic pump start button to observe whether the hydraulic pump relay is pulled in.

Check hydraulic pump relay

1. If the relay does not pull in after the hydraulic pump is started, check it

1 Whether the hydraulic pump thermal relay is activated or damaged.

2 Whether the power circuit is normal (check with a multimeter).

3. Whether the start and stop button contacts are normal, and whether the control circuit is open.

4 Whether the relay coil is damaged (check with a multimeter).

2. If the relay is pulled in after the hydraulic pump is started, check it

1 Whether the hydraulic pump is damaged.

2 Whether the connection line between the three-phase power supply and the hydraulic pump is normal.

3 Whether the hydraulic pump is damaged or the assembly is too tight. It should be easy to turn the coupling by hand, and there should be a gap of about 3 to 5 mm when moving the coupling left and right.

Die casting machine failure: no total pressure

No total pressure Check and analysis: After the hydraulic pump is started, press the pressure start button, first observe whether the pressure indicating ammeter shows a value, to determine whether there is current in the solenoid coil of the proportional pressure valve (proportional relief valve), and distinguish whether it is an electrical or hydraulic fault.

1. Check if there is current output

1 Whether the hydraulic pump is reversed (the person faces the direction of the hydraulic pump shaft, and the clockwise rotation is the forward rotation).

2 Check the overflow valve to see if it is improperly adjusted or stuck.

3 Check whether the shut-off valve is closed.

Check the relief valve

4. Whether the first-speed and second-speed cartridge valves of injection injection are in the open state, and whether the hydraulic valve that controls the pressurization is normal.

5. Whether the throttle valve of the proportional relief valve is missing or loose.

2. Check if there is no current output

1 Whether the rectifier plate is normal, and whether the pressure proportional amplifier plate is improperly adjusted or damaged.

2. Observe whether the computer is working normally. Press the pressure-starting button by hand to see if there is input at the corresponding point on the computer, and whether the total pressure point has output. If there is no input, check whether the line between the pressure-starting button and the computer is normal. If there is no output at the total pressure point, the computer is faulty.

3 Check whether the line between the output of the electric proportional board and the oil valve is normal, and whether the electric proportional coil is normal.

4 Check whether the pressure dialing is normal.

Automobile Parts-Right Bracket-500T

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1.Die design

Number of cavities; In-gate design; air exhaust system; moving cores; parting; cooling; ejector placement.

2.Part design and optimizing

Optimizing for process; tolerance; wall thickness; draft angle; radii inside /outside; Parting.

3.Flow simulation to evaluate die design and eliminate initial design defect.