Universal milling machine features:
The main features of the universal milling machine are structural stability and wide processing range. The milling head is a combination of two 45 ° angle milling heads, from the mechanical point of view, in the cutting process to offset the left and right and up and down the direction of resistance, making universal milling machine more stable than other structural milling machine, which is the main universal milling machine Features. At present there is a milling on the market can only do 90 ° rotation is very convenient, but this structure, from the mechanical point of view this can not eliminate the cutting resistance, so the service life is reduced a lot, and can not do multi-angle rotation. (With universal milling head steering icon Figure 1)
Universal milling machine milling head can achieve 360 ° rotation to solve the ordinary milling machine and this can not be processed in the processing of some dead ends such as: slope angle, diamond angle, ordinary milling machine also not be achieved. (With processing map)
The shortcomings of the universal milling machine and its improved methods:
Universal milling machines also have some drawbacks such as: speed is generally around 2000 rpm, the spindle can not be stretched because is structure is driven by two pairs of 45 ° helical bevel gears (red gears in Figure 3). This gear characteristics of the torque transmission torque is strong, but its shortcomings are noise, heat is not good, coupled with the general use of grease, heat is not good, reducing the gear life.
Universal milling machine needs revolution is to improve the speed, to achieve the high precision milling head automatically change the angle of the function. Improve gear material and machining accuracy. To achieve the speed can reach 6000-10000 turn, change the lubrication and cooling problems, so that you can use in the processing center to improve the machining center cutting force is not high, the production efficiency is reduced, you can also apply to the large gantry machining center to achieve high Speed, high precision, high efficiency. So that abrasive manufacturing industry to reduce a lot of costs.
The issues that need resolving:
First of all to solve the material problem, we currently use the material 20GrMnTi 40Gr steel in the current production , is basically to meet the requirements, but in the current automated production for the market ,this can not meet the needs. We currently take the process of turning milling - heat treatment - nitriding and carburizing - fine grinding. If we use plastic alloy material to solve the high fever , when the original gear is very easy to produce sintering problems, the second is to solve the high-speed gears in the case of noise problems ,Third, to solve the problem of gear life.
Milling head material improvement;
To choose high-precision ball cast iron , because of this material under high temperature deformation small. Because the ball cast iron material structure and ordinary gray cast iron is different. (Cast iron atomic structure Figure 4) , the ball cast iron in the high frequency of rotation is a small amount of wear deformation and gray cast iron can not do this.
Solve the problem of the material at the same time, but also to solve the processing problem A high precision parts processing can not be separated from high precision equipment, universal milling head processing, mainly in the spindle hole axis and 45 ° angle of the joint control accuracy. To use high-precision composite boring and milling center can be achieved, but also a sophisticated inspection equipment to ensure the accuracy of the work piece.
Solve the machining problem and solve the assembly problem:
High-precision assembly to 25 ° ± 3 ° in the constant temperature of the room, in a clean state can be achieved. The assembly of the staff have to go through a professional, experienced technical staff, with mechanical automatic device equipment can be achieved, here is not doing a detailed description of .