We have a lot to tell you about tapping:

Definition of in-die tapping unit:

In-die tapping unit, also called in-mold tapping machine, is a device specialized in forming threads. Due to the integration of stamping and tapping, it can eliminate the secondary processing process of stamping parts, reduce costs, improve production efficiency, and form threads with high precision, suitable for progressive die or transfer die, and is a promising tapping processing technology. The mechanical working principle is to achieve the purpose of thread forming by converting the up and down movement of the punch/bed slider into the spiral movement of the extrusion tap.

Features: Compact structure, easy to install, mechanical drive assembly, or servo drive, small size.

advantage: Thread forming has high precision, stable quality, reduces processes and improves production efficiency.

development path

In-mold tapping machines have been developed and produced as early as the late 1970s. For example, France, Germany, and Italy have successively launched products. The application of in-mold tapping technology has been very common, especially in the fields of automobiles, electronics, household appliances and other fields. The use of this technology has doubled production efficiency. After 2005, China’s tapping technology has gradually matured. Due to differences in tapping principles, technical capabilities, and service levels, the market shares and industries occupied by various in-mold tapping machine manufacturers also have certain differences.

In-die tapping unit began to appear in the Chinese market at the end of the 20th century and the beginning of the 21st century. In the early days, they were basically monopolized by foreign markets or domestic distribution agents. After years of contact and accumulation, there are two development paths in China. One is to transform from the original agent to direct technology transfer to form domestic production and sales. Second, some companies carry out technological improvement and development, production and sales through imitation.
With continuous technological breakthroughs, in-mold tapping machines are mainly divided into three parts of transmission components (including transmission screw assembly, transmission cup assembly, or servo motor and control unit. As well as other uncommon forms such as gear and rack structures) , Tapping components (lead screw, tap collet, etc. are mainly used to clamp taps and control the pitch of production products), fuselage main body (mainly refers to the fuselage plate, and structural main body)
From the original single number of tap, one machine has been developed with multiple taps (some companies can even do 24 tap in one machine)

With the continuous optimization and technological improvement of the transmission structure, by 2020, the market will basically be driven by screws and servo motors. The transmission structure of rack and pinion is already rare. From the original machine, single hole tapping or multi-hole tapping Multiple screw drives are required, and the evolution to a single screw drive can meet most needs, greatly reducing the size of the original machine and the space used in the mold. The transmission components have evolved from racks to screw drives and servo motor control. At the same time, the screw has changed from a single head to a multi-head thread (making the transmission more supple and effectively reducing friction and impact).

As for the tapping components

As for the tapping components, through continuous technological improvements, basically in-mold tapping machines will use up and down protection. That is, if the hole position is inaccurate and the hole position deviation is relatively large during tapping, the machine can be effectively protected in this way. It will not be damaged and can effectively reduce the breakage of taps. (Downside protection). For high-speed tapping, it is necessary to ensure that the thread is intact, and the thread cannot be pulled when retracting. At this time, upward protection is needed. The mutual cancellation of forces is used to achieve a force that is not pulled. The thread is only subject to the friction of rotation. This effectively ensures the quality of threads. As for machine quality and structure, different manufacturers in the market have different experience values. This is very important for the molding of aluminum products. At the same time, this part is also constantly undergoing technological innovation, such as: multi-cavity in-mold tapping machine tapping assembly protection device, in-mold tapping machine with exit and over-torque failure device.

The auxiliary equipment used in conjunction with the in-mold tapping machine has also been making continuous breakthroughs and advances, including the following categories:

1.Tap lubrication system (cooling tap)

2.Tap detection system (detecting whether there is missing tapping or whether the tap is broken)

3.Misfeed positioning system (check the hole position and whether the hole diameter is normal before tapping)

4.Thread detection system (in-mold pass and stop gauge detection)

Basically, when applied to the above auxiliary equipment, full thread inspection can be achieved to ensure 100% quality threads. It lays the foundation for automated and unmanned management.
The use and maintenance of in-mold tapping machines also have certain characteristics. Mechanical machines basically require oiling and maintenance in three places. The settings, maintenance cycles and methods of each manufacturer are different, but they are all similar. The specific details should be determined according to each manufacturer. requirements are implemented. Similar pictures
Domestic companies with strong capabilities can provide a complete set of technical support. Although there are still some gaps with some foreign companies (mainly limited by domestic supporting equipment and resource constraints), basically in-mold tapping technology can be met in China. production needs. Chinese companies have greater flexibility in responding to the market. Technology is also constantly innovating.


products are molded using molds, especially in the fields of automobiles, electronics, and electrical appliances. And the production of mold molding has the advantages of high precision, high complexity, high uniformity and high efficiency that other processing methods cannot match. Although my country’s mold industry has maintained a good growth trend, the high-end market of my country’s molds still relies on imports, especially for some large automobile panel molds, some molds that require ultra-high precision and multi-functional composite molds. In-mold tapping technology is a type of multi-functional composite mold. Because in-mold tapping effectively avoids secondary operations, improves work efficiency, and completely changes the processing technology of metal stamping parts, these high-tech molds It has become the main development direction of the domestic mold industry.
In-die tapping unit has seen obvious differentiation. Large companies are becoming stronger and stronger, while small and medium-sized enterprises in the industry continue to differentiate. At the same time, in-mold tapping machines made in China have already introduced in-mold tapping technology to the world with the development of the mold industry. Include the United States, Canada, Australia, parts of Europe, the Middle East, South Africa, and Southeast Asia.

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