In the transmission of worm gears, worm gears and worms are important moving parts. At this stage, worm gears and worms are widely used in mining machinery and engineering machinery. After the CNC lathe was applied to practical production, the production power of the worm wheel and worm was not only improved, but also the machining accuracy was guaranteed. There is a certain degree of difficulty in machining worm gears on CNC lathes. It is necessary to accurately grasp the depth of the machining and the degree of the cutting tool to prevent the phenomenon of knife sticking that may occur during the machining process.
Worm gear manufacturers' analysis of multi-head worm gears
Design process content
The main processing content is the right-handed axial straight gallery multi-head worm gear, and there is no need to set the back-out amount in the process of programming the workpiece. The right side of the multi-head worm gear is the position of the starting point. In the process of machining the worm gear, the starting point of programming is generally set on the right end of the workpiece. The workpiece material is generally selected as 45 steel; the tool material is generally selected as high-speed steel or cemented carbide; set the full tooth of the worm gear to 6.6mm, and use the G92 command to end the left and right cutting method to cope with the situation of a large amount of back tool. Therefore, the reliability of the processing is guaranteed; in the process of clamping the workpiece, the method of one-clamp one-top or double-top clamp is generally preferred for clamping; the fault of the tooth root circle diameter needs to be controlled within 0.2mm, and The error of the Z-axis tool change needs to be controlled within the left and right tool rushing amount, specifically 0.1mm, which must meet the requirements of the work piece.
When designing the process, the main program needs to be carried out from the starting point, and other subroutines are needed in the process of processing multi-head worm gears, so that the integrity of the entire process can be guaranteed. Generally, finish turning is performed after rough turning. The speed of the lathe is selected as 10 RPM. During the machining process, the accuracy of the axial tooth thickness and the surface roughness of the tooth side must be recognized. After the rough turning of the left and right cutting method, you can see the gap of the blade between the spaced blades on both sides of the tooth. The recognition of the starting point of the fine turning can be adjusted to a certain extent based on the fault of the tool to prevent the phenomenon of empty cutting. After the positioning of the main program for finishing, the left side surface of the worm gear is processed strictly in accordance with the requirements of the relevant drawings. Assuming that the main program requires secondary positioning, the thickness of the worm gear and the roughness of the right side surface must be guaranteed. In addition, the addition of cutting fluid can advance the cutting power to a certain extent and improve the quality of tooth surface processing.
