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Are You Bothered By The Taps Problem ,Look at This

Are you bothered by the tap problem, look at this.

Problems encountered by taps in CNC machining operations: chipping, chip removal, double eyelids, tooth burrs, missing teeth, broken.

Tap break blade

Tapping is a relatively difficult machining procedure, because its cutting edge is basically 100% in contact with the workpiece, so various problems that may occur, such as the performance of the workpiece, the choice of tools and machine tools, and how high the cutting speed should be , Feed amount, etc.

Choice of tap and cutting amount

There are too many tools to choose from in tap selection. First of all, we should figure out five questions before tapping:

1. What material is the workpiece being processed?

2. How strong is the material of the workpiece?

3. Are the processed screw holes through holes or blind holes?

4. How deep is the screw hole (or what is the allowable thickness?

5. What are the types and sizes of screw holes to be processed?

For materials with high hardness and strength, the tap should select the eccentric clearance angle from the beginning of the cutting edge.

Selection of flute tapping flutes

First of all, we need to understand the rough classification of tapping chip removal, including straight groove type, spiral groove type, first spiral groove type.

Straight groove type, balanced choice.

Spiral taps are suitable for blind hole processing. The disadvantages are that the positive angle blade is too sharp, and the durability is not good and the price is expensive.

The apical spiral groove type is more conducive to chip removal than the straight groove type, which is more durable and suitable for through holes. The disadvantage is that the apex invalid wire.

The apical spiral groove type is more conducive to chip removal than the straight groove type and is more suitable for through holes. The disadvantage is that the apex invalid wire is too long.

Simple contrast relationship of straight groove type, spiral groove type, apex spiral groove type tap:

Spiral groove tap

Spiral groove taps are mainly used for blind hole thread processing. When processing hard and high-strength workpiece materials, using a tap with a smaller helix angle can improve its structural strength.

For processing 400 series stainless steel (15 ° helix angle)

Used to process 300 series stainless steel (41 ° helix angle) Figure 3 Spiral groove tap

Contrast between spiral and apex spiral

The spiral shape is suitable for blind holes, and iron filings are discharged out of the holes. Spiral apex, chip downwards.

If you still do n’t understand, look at this. Intuitive comparison of straight groove and spiral

Tapping of special workpiece materials

The workability of the material of the workpiece is the key to the difficulty of tapping. According to the performance of the material, it is very important to change the geometry of the cutting part of the tap, especially its rake angle and the degree of depression in front of the depression.

Machining high-strength workpiece materials

For high-strength workpiece materials, the rake angle and depression of the tap are usually small, increasing the cutting edge strength. Long chip materials require large rake angles and undercuts for chipping and chip breaking. Machining harder workpiece materials requires a larger rake angle to reduce friction and adequately cold cutting edges.Processing of materials with different hardness levels.

For materials with high hardness and strength, the tap should select the eccentric clearance angle from the beginning of the cutting edge.

For example, when processing stainless steel materials, a spiral groove with a small rotation angle is selected to cope with the hard and sticky processing characteristics of stainless steel in order to facilitate long-term cutting and chip removal of blind hole tapping.

Tapping stainless steel materials

Common problems during tap tapping

1. The bottom hole is too large, which causes the top of the tooth to be rough and the end of the stop gauge to be screwed in.

2. The cutting force is too large, or the tap wear is severe and the replacement is not timely. The cutting resistance suddenly becomes large and then breaks.

3.W-thread thread crest is usually too strong by the head or the second return attack.

4. Incorrect selection of spiral groove.

There are various causes of tap breakage: machine tools, fixtures, workpieces, processes, chucks and tools are all possible.

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