The use of forklift axle housing for CNC machine tools

When machining the workpiece, due to the limitation of the axle housing structure, the hydraulic tailstock clamps the workpiece due to the axial force, so that the deformation of the bridge and the bore is inconsistent, the workpiece will be deformed by deflection, and after the machining is finished, the tip is deformed. The rebound causes the tolerance of the surface of the rotary surface to be out of tolerance, and the value of the radial circle jumps to the middle portion. In order to solve the surface roughness problem of the machined surface, the unilateral improvement of the machine speed can still not solve the problem. Because the part is an asymmetrical structure, the imbalance caused by the high-speed rotation of the workpiece will make the geometrical tolerance too poor.

The surface is machined using a Sandvik width of the fine-cutting knife to cut the surface to produce severe tool vibrations with squeezing marks. The vibrating lines are spiral and have a width similar to that of non-metallic cutting. The analysis knows that the slot cutter should be used at high speed, and the unilateral increase of the machine speed due to structural constraints will result in loss of balance when the workpiece rotates, resulting in increased radial runout. The machining allowance of the shoulders is uneven, and there is no machining allowance at the shoulder of the workpiece. There are three reasons: on the one hand, the size of the hole positioning holes at both ends of the size is inconsistent, and the center shifts when the workpiece is positioned; on the other hand, the horizontal turning lathe is used for rough roughing, and the machining allowance is inconsistent everywhere, and the error will be accumulated to a certain extent. There is no machining allowance for the shoulder at some point; another reason is the size.

The contact area between the positioning holes at both ends and the tip of the machine tool is not enough, there is a virtual contact, and the workpiece is displaced during the cutting process. Measures In response to the above problems, the following measures are taken: the composite jig at the boring increases the anti-deformation mechanism to eliminate the deflection deformation of the workpiece during clamping. Change the fine car cutter blade structure. Due to the limitation of the workpiece structure, the standard slot cutter performance cannot be fully exerted when the speed cannot be unilaterally increased. A contact between the blade edge and the workpiece is reduced in the middle of the blade edge to eliminate the problem caused by the tool transversely moving. Vibration; at the same time increase the back angle of the blade, improve the chip removal performance, reduce the extrusion, the blade uses Sandvik "breakthrough No. 1" blade. Use special tools and gauges to strictly control the axial dimension and contact area of ​​the chamfering of the face at both ends of the axial dimension of the axle housing.

Calculate the dimension chain, draw the rough rough drawing of the rough, clarify the machining allowance of each rough car part, and adopt the economical lathe roughing blank to ensure the consistency of the blank size. By taking the above measures, the influencing factors are completely eliminated, and qualified workpieces are processed. The economical use of this equipment to process the forklift drive axle housing improves efficiency, reduces labor intensity, reduces manufacturing costs, and shortens the processing cycle.

Conclusion Through the successful application of this machine tool in our factory, the application knowledge. We believe that in the future application of CNC machine tools, we should pay attention to the following aspects: clear the processing parts and contents of the machined parts, and determine the process flow of the processing object. When arranging the processing steps, the characteristics of the machine tool should be fully considered, and the principle of centralized processing in multiple processes in one clamping should be adopted to reduce the number of clamping times, the number of tool changes, and the idle travel time to eliminate unnecessary positioning errors; unreasonable process The arrangement causes the production tact of each machine tool to be mismatched, and it may not be able to form a beat production.

According to the actual needs, choose the reasonable numerical control machine tool precision index, mainly the positioning accuracy and repeat positioning accuracy. The positioning accuracy and the repeat positioning accuracy comprehensively reflect the comprehensive precision of each moving component of each axis, especially the repeated positioning accuracy reflects the positioning stability of the control axis at any positioning point within the stroke. Choose a reasonable CNC system. With the development of digital technology, the function of the numerical control system is relatively strong, and the price difference is relatively large. The cost-effective numerical control system should be selected according to the actual situation, so that its performance can be maximized.

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