CNC tool: When designing the clamping device, the determination of the clamping force includes three elements: the direction of the clamping force, the point of action and the magnitude of the clamping force.
1. The direction of the clamping force of the CNC tool The direction of the clamping force is related to the basic configuration of the positioning of the small parts and the direction of the external force on the workpiece.
Observe the following guidelines when selecting CNC tools:
① The direction of the clamping force should be conducive to stable positioning, and the main clamping force should be directed towards the main positioning base.
②The direction of the clamping force should be conducive to reducing the clamping force to reduce the deformation of the workpiece and reduce labor intensity.
③The direction of the clamping force should be the direction with better rigidity of the workpiece. Since the stiffness of the workpiece in different directions is not equal, different force-bearing surfaces also deform differently due to the size of the contact area. Especially when clamping thin-walled parts, care should be taken to make the direction of the clamping force point to the direction of the rigidity of the workpiece.
2. The action point of the clamping force of the CNC tool The action point of the clamping force refers to a small area where the clamping part contacts the workpiece. The problem of selecting the action point is to determine the position and number of the clamping force action point under the condition that the clamping direction is fixed. The selection of the clamping force point is the factor to achieve a better clamping state, and the reasonable selection of the clamping force point follows the following principles:
200 The roughness value of the grinding surface is reduced from 2.0 to 1.1 CNC tool
3. The energy consumption of CNC tool processing is low, saving manufacturing resources. When cutting at high speed, the volume of cutting layer material cut by unit power increases significantly. Such as Lockheed Aircraft Company's aluminum alloy high-speed cutting, the spindle speed is from 4 000 1/…. When increased to 20 000, the cutting force decreased by 30^, while the material removal rate increased by 3 times. The material removal rate per unit power can reach 130~160 (1) than 'tearing', while ordinary milling is only 30 'tearing). Due to the high removal rate and low energy consumption, the production time of the workpiece
It is short, improves the utilization rate of energy and equipment, and reduces the proportion of cutting processing in manufacturing system resources. Therefore, high-speed cutting meets the requirements of the sustainable development strategy.
4. CNC tools simplify the process and reduce production costs. In some applications, the surface quality of high-speed milling is comparable to that of grinding, and high-speed milling can be directly used as the next finishing process. Therefore, the technological process is simplified, the production cost is reduced, and the economic benefit is considerable.
Of course, high-speed milling also has some disadvantages, such as expensive tool materials and machine tools (including CNC systems), high requirements for CNC tool balance performance, and low spindle life.
Post time: Dec-01-2019
