A crankshaft lathe is a specialized type of lathe used to machine the connecting rod neck and the crank arm side of an internal combustion engine and an air compressor crankshaft.
Compared with general lathes, crankshaft lathes have the following characteristics:
(1) The special chuck is used. In addition to the chuck with the general clamps, the chuck also has the function of adjusting the eccentricity and the azimuth.
The chuck is mounted on the machine tool spindle, and the slide table can be moved on the radial rail of the chuck body to adjust the eccentricity.
The chuck holds the workpiece and can be swung around its own axis to adjust the azimuth.
(2) Large crankshaft lathes do not have a rear ejector pin, but have a central frame support with the same number of crankshaft journals at the lower part of the workpiece.
(3) Multi-tool machining semi-automatic cycle. In order to improve productivity, the crankshaft lathe generally has front and rear tool holders, and the connecting rod neck and the arm side are processed at the same time.
The machine is automatically processed after starting the machine, and the machine stops automatically after processing.
The reason why the crankshaft lathe has these characteristics is that the rigidity of the crankshaft itself is poor in design and manufacture, the crankshaft connecting rod neck and the crankshaft rotation line do not coincide, and the azimuth angle of the crankshaft is different.
Conditions of Use
The normal use of the crankshaft lathe must meet the following conditions: the power supply voltage fluctuation at the position where the machine is located is small, the ambient temperature is lower than 30 degrees Celsius, and the relative temperature is less than 80%.
- Machine position environmental requirements
The position of the machine tool should be away from the vibration source, and the direct sunlight and heat radiation should be avoided to avoid the influence of moisture and air flow.
If there is a vibration source near the machine tool, anti-vibration grooves should be placed around the machine.
Otherwise, it will directly affect the machining accuracy and stability of the machine tool, which will make the electronic components contact poorly, cause malfunction, and affect the reliability of the machine tool.
- Power requirements
Generally, the crankshaft lathe is installed in the machine shop, which not only has large changes in ambient temperature, but also has poor use conditions, and various electromechanical devices are numerous, resulting in large fluctuations in the power grid.
Therefore, the location of the crankshaft lathe requires strict control of the power supply voltage.
Power supply voltage fluctuations must be within the allowable range and remain relatively stable. Otherwise it will affect the normal operation of the CNC system.
- Temperature conditions
The ambient temperature of the crankshaft lathe is less than 30 degrees, and the relative temperature is less than 80%.
Generally, the numerical control electric control box is internally provided with an exhaust fan or a cooling fan to keep the electronic components, especially the central processing unit, with a constant operating temperature or a small temperature difference.
Excessive temperature and humidity will result in reduced life of the control system components and lead to increased failure.
Increased temperature and humidity, increased dust can cause bonding on the integrated circuit board and cause short circuits.
- Use the machine according to the instructions
When using the machine, the user is not allowed to arbitrarily change the parameters set by the manufacturer in the control system.
The setting of these parameters is directly related to the dynamic characteristics of the various parts of the machine.
Only the value of the gap compensation parameter can be adjusted according to the actual situation.
The user cannot change the machine attachment at will, such as using a hydraulic chuck that exceeds the specifications.
When the manufacturer sets the accessories, it fully considers the matching of the parameters of each link.
Blind replacement causes mismatches in the parameters of various links, and even causes an accident that is not estimated.
The pressure of the hydraulic chuck, hydraulic tool holder, hydraulic tailstock, and hydraulic cylinder should be within the allowable stress range, and no increase is allowed.