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我厂生产的某产品零件上有一M90×1.5—6H 的内螺纹(通孔),考虑到加工该螺纹切削量较大,直接用丝锥加工有一定困难,故该螺纹先在普通车床上进行粗加工。为了使加工出的产品零件具有良好的互换性,然后用具有标准尺寸的丝锥在车床上进行校正加工。由于加工的产品批量大,丝锥的损耗较多,因此,设计了简易的装配式丝锥(如图所示)。装配式丝锥,是先将丝锥3装入柄部5的前端光滑部分。用键4将丝锥与柄部固定,防止丝锥在工作中与柄部有滑动。再将螺钉1套入垫圈2并一同拧在柄部上即可。为了不损坏已粗车出的螺纹牙型,保证丝锥在校正加工过程中具有良好的对中性,需在丝锥切削锥的前端增加一光滑圆柱面作为导向部分。其圆柱直径Φ应比丝锥小径小0.2～0.3mm;长度尺寸 L 取4～6mm;
I plant a product parts have a M90 × 1.5-6H internal thread (through hole), taking into account the processing of the larger thread cutting, tap processing directly have some difficulties, so the thread rough in the ordinary lathe Processing. In order to make the processed product parts have good interchangeability, and then use a standard size of the tap in the lathe for calibration processing. Due to the large volume of processed products, tap loss more, therefore, the design of a simple assembly-type taps (as shown). Assembly type tap, tap 3 is first loaded into the smooth part of the handle 5 front. Use the key 4 to fix the tap and handle to prevent the tap from sliding with the handle during work. Then set the screw 1 into the washer 2 and screw it together on the handle. In order not to damage the already rough out of the thread profile, to ensure that the tap in the calibration process has a good neutrality, you need to tap the front end of the tapered cone to increase a smooth cylindrical surface as a guide part. The diameter of the cylinder Φ should be 0.2 ~ 0.3mm smaller than the tap diameter; length size L take 4 ~ 6mm;