Tree parts are a common type of parts, with a rotary body structure, generally larger than the diameter, and are widely used in various mechanical equipment to support the transmission parts, transmit the torque and the loads of ‘bear. The machining of the tree parts must follow certain rules.
1. Basic treatment routes for tree parts
The main parts of treatment of parts in the tree are external circular surfaces and common special surfaces. Basic treatment routes can be summarized in four.
First of all, the road to treatment for the rough truck to a semi-finished truck, then to a fine truck. -Camie finalized, then with coarse grinding, and finally the processing path for fine grinding is adopted. Grinding is its most ideal monitoring processing process; Ferreous metals have less harshness and are subject to blockage. With the semi-finished car, then rough grinding, fine grinding, and finally performs a photo finishing treatment.
2. Pre-processing of tree parts
Before turning the outer circle of the parts of the tree, certain preparation processes must be carried out, which is the process of pre -treatment of the parts of the tree. The most important preparation process is to straighten. Because the piece of whites leans and often deforms during manufacturing, transport and storage. In order to ensure reliable tightening and uniform distribution of the treatment allowance, in the cold state, calibration is carried out by various presses or smoking.
3. Positioning of the reference for the machining of the tree parts
First, the central hole in the part is used as a positioning reference for treatment. In the treatment of parts of the tree, the coaxiality of each external circular surface, the conical hole and the surface of the thread, and the perpendicularity of the end in front of the axis of rotation are important manifestations of the precision of the position. These surfaces are generally based on the central line of the tree as design reference and are positioned with a central hole to comply with the principle of overlap of the reference. The central hole is not only a positioning reference during the treatment of the turn, but also a positioning reference and an inspection reference for other processing processes, which complies with the unified reference principle. When two central holes are used to locate, several external circles and end faces can also be treated to the maximum extent in a single tightening.
The outer circle and the central hole are used as a positioning reference for treatment. This method effectively overcomes the disadvantage of poor rigidity in the positioning of the central hole, especially when processing heavier parts, the positioning of the central hole will cause unstable tightening and the quantity of cut should not be too large. If you use the outer circle and the central hole as a positioning reference, you don’t have to worry about this problem. During rough machining, the method of using the external circular surface of the tree and a central hole as a positioning reference can withstand a large cutting torque during machining, which is the most common positioning method For the pieces of the tree.
The third is to use the two external circular surfaces as a positioning reference for treatment. When machining the inner hole in the hollow shaft, the central hole cannot be used as a positioning reference, so that the two external circular surfaces of the tree must be used as a positioning reference. During the machining of the machine-tool pin, the two support journals are often used as a positioning reference, which can effectively ensure the requirement for coaxiality of the cone hole compared to the support journal, and eliminate the errors caused by the non-coincision of the reference.
Finally, the cone cap with a central hole is used as a positioning reference for treatment. This method is most often used in the treatment of the external circular surface of the hollow shaft.
4. Crampting tree parts
The treatment of cone caps and handle mandrels in cone must have high machining precision. The traffic jams or the surface of the cone on the sleeve mandrels of the cone are that it has a high degree of coaxiality with the central hole. Consequently, when choosing a tightening method, you must pay attention to the minimization of the number of installation time of blocking of the cone, thus reducing the repeated installation error of the parts. In real production, once the cone is installed, it will generally not be deleted or replaced during treatment before the end of treatment.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
