Mechanical process How to machine threaded holes

1. Drill the bottom hole of the thread to the required depth.

2. Drill the hole in the middle part (if the chamfer of the tail of the threaded hole has an angle requirement, the drill bit will be sharpened according to the requirements).

3. Drill the last big hole, grind the drill bit as required, and drill the flat bottom hole.

1.Countersinking. Machining of the largest counterbore;

2.Machining of the smallest bottom holes;

3.processing of the optical aperture in the middle part;

4.Finally, the threaded holes are processed.

The process of fitter making screw holes and screws: the process of making screw holes is to make threaded bottom holes, and then tapping and tapping, and the screws are processed by lathes.

The parts are assembled, assembled and matched according to the assembly technical requirements of mechanical equipment, and adjusted, inspected and tested, etc., to make them qualified mechanical equipment.

Precautions: 1) The file is a right-handed tool, which should be placed on the right side of the vise, and the handle of the file should not be exposed outside the tong table when placed on the vise, so as not to fall off the ground and hurt the foot or damage the file.

2) Do not use a file without a handle or a file with a split handle.

3) The file handle should not hit the workpiece during filing, so as to avoid accidents caused by the file handle falling off.

The principle of threaded hole processing is to punch the hole first, and then tap the wire with a tap. The diameter of the perforation is the inner diameter of the thread, and its processing technology content is also very demanding.

In traditional machining, if the bottom hole and tapping thread are processed before bending, after bending, because the threaded hole is in the deformation area, the threaded hole is deformed into an elliptical hole by bending, and the basic function of the thread has been lost, and it cannot be corrected, so this process method cannot be used.

If it is bent after processing the bottom hole and tapping the thread, the hole center is on the arc surface, the direct drilling is easy to drill deviation or break the drill bit, plus the tooling fixture, there is a drill sleeve guide, the drilled thread bottom hole is easy to become an oblique hole, and the thread is also oblique, so there is an urgent need on the market for a threaded hole processing structure that is not easy to deform on the bending part to improve this equipment.

Any kind of machine, no hole can not be made, to connect the parts, need a variety of different sizes of screw holes, pin holes or rivet holes, in order to fix the transmission parts, need a variety of mounting holes, the machine parts themselves also have many kinds of holes, processing holes so that the holes meet the requirements of the operation is called hole processing.

Any size of the taper thread bottom hole can be directly drilled and tapped. The cone pipe screw slowly sells the pattern 1 16, and the diameter of the Ma Zheng Natan flower drill. Cone pipe thread 1 8, twist drill diameter.

Cone pipe thread 1, twist drill diameter. Cone pipe thread 2, twist drill diameter. The above data is taken from the thread standard manual.

The taper of the taper pipe thread is 1:16, and after drilling the bottom hole of the thread, the taps complete the subsequent processing work.

There are several processing methods for screw holes:

Drilling method: use a drill bit to drill a hole in the workpiece, and then use a thread to cut out the thread in the hole.

Reaming method: Drill a hole in the workpiece first, and then use a reamer to cut a thread in the hole.

Rolling method: Threads are rolled out on the workpiece with a rolling tool, which is suitable for mass production.

Skateboard cutting method: Cutting threads on the workpiece with skateboard cutting tools, suitable for high-precision and high-quality thread processing.

Die forging method: use a mold to forge on the workpiece, and at the same time forge the threads together to create a dry stool.

Self-tapping threading method: Cutting self-tapping threads directly on the workpiece, suitable for materials such as thin plates and plastics.

These methods have their own advantages and disadvantages, and the selection needs to be comprehensively considered according to the workpiece material, thread specifications, machining accuracy and other factors.