Applicable to rounding and chamfering the outer and inner corners of machining parts of general mechanical cutting, not suitable for rounding and chamfering special requirements.
2. clipping (JB/ZQ4238-1997)1. Chamfering and rounding of the outer round recess and related accessories
2. Undercuts with the same nominal diameter and different fits
3. Groove with slot and slot
- undercut slotted hole. The diameter d2 of the undercut can be determined according to the selected flat or V-key, the depth t2 of the undercut is usually 20 mm, and for design reasons the minimum value of t2 must be at least 10 mm; Undercut roughness is generally selected as Ra3.2um, Ra1.6um, Ra0.8um, Ra0.4um can also be selected according to needs.
4. Grinding wheel overtravel groove (GB/T6403.5—1986)
Suitable for the overtravel groove of the grinding wheel on the grinding surface of common structural parts. Grinding wheel overtravel groove on the turntable and end face.
3. Dovetail Groove (JB/ZQ4241-1997)Dovetail grooves are often used in conjunction with trapezoidal rails to guide and support them.
4. oil groove (GB/T6403.2-1986)Suitable for plain bearing oil grooves and general purpose flat surface oil grooves.
1. The shape and size of the lubrication groove for plain bearings.
2. The shape and size of the oil groove on the plane
5. Center holeSee Table 1-36 for type A center hole without protector, type B center hole with protector, type C center hole with protector and threads, see Table 1-38, type R center hole.
6. Knurling (GB/T6403.3—1986)
The process of rolling a pattern onto the surface of a workpiece with a knurling tool on a lathe is called knurling. The knurling pattern usually has two kinds of straight fiber and mesh pattern, and different thickness. The thickness of the pattern is determined by the step size.
1. Form of knurling and form of knurling pattern
The thickness of the knurling pattern should be selected according to the diameter of the knurling surface of the workpiece. If the diameter is large, select a pattern with a large modulus, if the diameter is small, select a pattern with a small modulus.
2. Examples of prescribed knurling marks
①Mouldulus m=0.2, straight grain knurling, its rules are designated as: straight grain m=0.2 (GB6403.3-1986).
②Grid pattern m=0.3, grid pattern knurling and its rules are marked as: grid pattern m=0.3 (GB6403.3-1986).
3. Knurling
(1) Install the blank. Fastening should be as reliable as possible.
①When installing the workpiece, the length of the chuck should be the shortest.
②The long piece is supported by the top.
③ When turning the outer knurling circle, its diameter should be about 0.25mm smaller than the final size.
(2) Install the knurling knife.
①Make sure that the chips on the knurling knife are removed, and if necessary, clean them with a wire brush.
②When installing the knurling knife, the pivot pin must be aligned and deflected at a slight angle.
④ Hold the tool firmly.
(3) The workpiece is knurled.
①Select low cutting speed and high feed.
②Start the machine spindle and apply enough coolant to the knurling cutter.
③ Shake the knurling knife to cut into the workpiece and apply pressure until a puffy diamond pattern is formed.
④ Feed horizontally and then longitudinally until the required knurling length is obtained.
⑤ Shake the knurling knife to quickly separate the workpiece.
(4) Chamfering. Deburr the end face of the workpiece by cutting a 45° chamfer 45° deep to the bottom of the knurling groove. heart high.
③ Visually adjust the knurling knife and tilt it at a slight angle for easier insertion.
④ Hold the tool firmly.
(3) The workpiece is knurled.
①Select low cutting speed and high feed.
②Start the machine spindle and apply enough coolant to the knurling cutter.
③ Shake the knurling knife to cut into the workpiece and apply pressure until a puffy diamond pattern is formed.
④ Feed horizontally and then longitudinally until the required knurling length is obtained.
⑤ Shake the knurling knife to quickly separate the workpiece.
(4) Chamfering. Deburr the end face of the workpiece by cutting a 45° chamfer 45° deep to the bottom of the knurling groove.