How to divide the thick teeth and fine teeth in the tap

Xinglong. The mold engineer will explain to you, under normal circumstances, wire tapping.

There are three kinds of standard teeth, coarse teeth, and fine teeth, and the commonly used and recognized tooth spacing in the thread world is usually called standard teeth, such as: m2*, m3*, m4*, m5*etc., wherein, is the standard tooth pitch, the same specification tooth distance is greater than the standard tooth for the thick tooth, less than the standard tooth distance for the fine tooth, such as:

M8* is the standard tooth pitch of M8, then M8* M8*1 M8* These three medium tooth spacing are the coarse teeth of M8, and the tooth spacing 1 is the fine or very fine teeth of M8.

The amount of coarse teeth and fine teeth in the thread boundary is relatively small, especially the coarse teeth are less, while the amount of fine teeth is relatively increasing, and there is an upward trend, due to the cost management in the industry.

The need for more and more workpieces tends to use the book type, the development of small workpieces, the book and the small workpiece due to the thickness, the number of teeth that can be accommodated inside is less and less, in order to ensure the need for thread tension, increase the number of teeth as much as possible, so the fine tooth is the first choice, on the contrary, the coarse tooth loses the market ......

For example, on the workpiece with a thickness of 1mm, if you need M4* tapping teeth, it can only be easy to have one and a half teeth, if you change to M4* tapping, you can get two complete teeth on the workpiece.

At present, due to the fact that fine teeth and coarse teeth have not reached the popularization in use, the dosage is only a special supplement compared with the standard tooth distance.

The difference between taps and plate teeth, taps are used for internal threads (hole threads), also called tapping; The die is used to tap the external thread. It's also called tapping, and the upstairs is the opposite.

Tapping is the plate tooth, which is used to process or repair the external thread, and its internal thread is threaded, which can be manually processed and can also be used in the threading machine, but the accuracy is relatively low; Tapping is used to machine internal threads, and it is threaded on the front and outside.

It should be the set of teeth (wire), the set of teeth (wire) is to form the external thread, and the tapping is to form the internal thread.

I thought that Bai was very clear about this concept before, but later Zhi colleagues asked a few times, and I was confused about the dao. We put the male threaded rod.

It's called screw capacity, right? So when processing this rod, do we call it tapping or tapping? It would be easy to understand if there were aliases between them, as mentioned upstairs. But some masters don't think so, and they have to check the books to see if they are specific.

Tapping machines and tapping machines are the same, but the names are different.

The difference between coarse teeth and fine teeth: the pitch size is different, the thick and dumb teeth are huge, and the fine teeth are small;

1. The spiral rise angle of the fine tooth is smaller, which is more conducive to the self-locking of the thread, so the fine tooth is generally used in the place where it needs to be prevented from loosening.

3. The number of teeth of the same length of coarse thread is small, the cross-sectional size of each tooth is larger, the force is good, and it is more suitable for bearing greater tensile force and impact force.

4. The fine thread should also have the advantage of small pitch, which can play a role in fine-tuning.

Fine thread and coarse thread screws are used for fastening.

Fine-tooth screws are generally used to lock thin-walled parts and parts with high requirements for vibration protection.

The so-called coarse thread, is the standard thread, in the national standard of thread can be found, generally we can buy outside the screws and bolts are coarse thread, compared with the fine thread, the coarse thread has the characteristics of high strength, good interchangeability is widely used, should be used as the best choice. Fine threads are relative to coarse threads, and there are standards to check, which can be found in the mechanical design manual. When designing, try to use standard specifications, fine threads have a small space size, good self-locking, mostly used in places where the force is not large, can be accurately adjusted, such as the lens fixation of various optical instruments, micrometers and other instruments are used for measurement purposes, some threaded connectors do not want to use tools such as oil cup cover, metal shell LED flashlight battery cover and so on.

Due to the small pitch of the fine tooth thread and the small height of the tooth shape, it is easy to mess up the teeth during installation, and the burr has a great impact on the assembly, so it must be cleaned up. At the same time, the number of disassembly and assembly of fine threads should not be too much.

The coarse one has high strength, and the fine one has a good seal. The same level ensures that the load difference is not much (slightly higher for the fine teeth), and the preload of the two is close when fastening. When anti-loosening measures are not taken, the anti-loosening effect of fine tooth threads is better than that of coarse teeth, and is generally used for thin-walled parts and parts with high requirements for vibration resistance.

When used for adjustment, fine threads are more advantageous. Disadvantages of fine threads: they are not suitable for application on materials with excessively coarse tissues and poor strength, and when the tightening force is too large, it is easy to slip the wire.

, coarse tooth tapping is applied to mechanical tapping, fine tooth tapping is usually suitable for aluminum alloy, magnesium alloy, etc., of course, there are exceptions, mainly depending on the tensile force that the threaded hole needs to bear, these birdmen downstairs, do not know what the wire tapping is, just talk nonsense, will mislead others, fine tooth tapping of the tooth pattern is usually a little shallower,

There is no essential difference, what is required is care and patience.

Tapping is to use a certain torque to screw the tap into the bottom hole to be drilled to process the internal thread.

1) The orifice of the threaded bottom hole on the workpiece should be chamfered, and both ends of the through-hole thread should be chamfered.

2) The position of the workpiece clamp should be correct, and the center line of the threaded hole should be placed in the horizontal or vertical position as far as possible, so that it is easy to judge whether the tap axis is perpendicular to the plane of the workpiece.

3) At the beginning of tapping, try to put the tap right, then put pressure on the tap and rotate the wringer, when cutting into 1-2 turns, carefully check and correct the position of the tap. Generally, when cutting into 3-4 turns of thread, the tap position should be correct. In the future, it is only necessary to turn the winch and no more pressure should be applied to the tap, otherwise the thread shape will be damaged.

4) When tapping, every 1 2-1 turns of the winch should be reversed, about 1 2 turns, so that the chips are easy to discharge after breaking, and can reduce the phenomenon that the cutting edge rolls the tap due to sticky chips.

5) When encountering a screw hole that cannot be tapped, it is necessary to withdraw the tap frequently to eliminate the chips in the hole.

Tapping machine is a kind of machining equipment that processes internal threads, screws or buckles on the inner surface of the holes of various parts with different specifications such as machine shells, equipment end faces, nuts, flanges, etc. Tapping machine is also called tapping machine, thread tapping machine, thread tapping machine, automatic tapping machine, etc.

The adjustment of high-precision tapping stroke is simple, the automatic reversal device can freely adjust the tapping stroke, the shallow hole and the low-hole machining parts can also be easily adjusted, the double safety device can prevent the damage (damage) of the tapping, the spindle rotation and up and down, the advance and retreat of the special double safety clutch, the spindle can be automatically stopped, and the reversal will not damage the tool.

Tooth pitch A, B gear with A, B shaft and spindle according to the tooth pitch to advance fully matched, vertical stability, precision, particularly high, screw tapping forward and backward do not need to exert force to operate. At the same time, it is determined by the excellent processing of products, which does not cause threads of different thicknesses, and can be used for soft products such as thin sheets, light-laminated metals, and synthetic resins. At the same time, it can also be equipped with multi-axis for multi-axis synchronous machining, which greatly improves production efficiency.

Tapping is one of the important contents of fitter metal cutting, including marking, drilling, tapping and other links. Tapping can only process triangular threads, which are connection threads and are used for the connection of two or more structural parts. The processing quality of threads directly affects the assembly quality effect of the construction, so the practical teaching attaches great importance to the teaching of all aspects of threading.

The working part is a slotted length of external thread. The working part of the tap includes a cutting part and a calibration part.

Hand taps are generally composed of two sets, which are divided into head cone and two cones. The outer diameter, middle diameter and inner diameter of the two taps are equal, but the length and taper angle of the cutting part are different. The head cone is longer, the cone angle is smaller, and there are about 6 incomplete teeth for cutting in.

The second cone is shorter, the cone angle is larger, and the incomplete teeth are about 2. The hinge is a tool for turning taps, often adjustable to grip a wide range of different tap sizes.

Tapping, tapping, and threading are the same processes, and Ruidexin tapping machine is generally the external or internal thread processing of the product.

Tapping, tapping, and threading are the same processing technology, but they are customarily called differently.

The big name taps the thread, the nickname taps, and the alias taps. The same meaning, the vest is different.

Is there a difference? It seems to be the same thing.

There is no difference between tapping and tapping, they are all the same, but the name is different.