4 thread drill cutter
The thread drilling and milling cutter is made of solid carbide and is a high-efficiency machining tool for medium and small diameter internal threads. The thread drilling cutter can complete the drilling of the bottom hole, the hole chamfering and the internal thread machining at one time, reducing the number of tools used. However, the disadvantage of this type of tool is its poor versatility and its high price. The tool consists of a drilled portion of the head, a threaded portion in the middle, and a chamfered blade at the root of the cutting edge. The diameter of the drilled part is the bottom diameter of the thread that the tool can machine. Due to the limitation of the diameter of the drilled part, a thread drilling and milling cutter can only process one thread of internal thread. When selecting a thread drilling and milling cutter, not only the threaded hole size to be machined, but also the effective machining length of the tool and the depth of the machined hole should be considered. Otherwise, the chamfering function cannot be realized.
5 thread auger milling cutter
Threaded auger milling cutters are also solid carbide tools for efficient internal threading. They can also be used to machine bottom holes and threads at one time. The tool end has a cutting edge like an end mill. Since the helix angle of the thread is not large, when the tool is helically machined, the end cutting edge cuts the workpiece material to machine the bottom hole, and then the thread is machined from the rear of the tool. Some threaded auger milling cutters also have chamfered edges that allow for the chamfering of the holes at the same time. The tool has high processing efficiency and is more versatile than the thread drilling and milling cutter. The tool can process the internal thread diameter range from D to 2D (D is the tool body diameter).
6 milling deep thread cutter
The milled deep thread cutter is a single tooth thread milling cutter. A general thread milling cutter has a plurality of threaded teeth on the cutting edge, the tool has a large contact area with the workpiece, and the cutting force is also large, and the diameter of the tool must be smaller than the threaded aperture when machining the internal thread. Due to the limitation of the diameter of the cutter body, the rigidity of the tool is affected, and the tool is unilaterally stressed when milling the thread. When the deep thread is milled, the knife phenomenon is easy to occur and the thread machining accuracy is affected. Therefore, the effective cutting depth of the general thread milling cutter is about 2 times the diameter of the body. The use of single-toothed deep-threaded tools can better overcome the above shortcomings. Due to the reduced cutting force, the thread machining depth can be greatly improved, and the effective cutting depth of the tool can reach 3 to 4 times the diameter of the cutter body.
7 thread milling tool system
Generality and high efficiency are a prominent contradiction of thread milling cutters. Some tools with composite functions (such as thread drilling and milling cutters) have high processing efficiency but poor versatility, while versatile tool efficiency is often not high. To solve this problem, many tool manufacturers have developed modular thread milling tool systems. The tool system generally consists of a shank, a boring chamfering edge and a universal thread milling cutter. Different types of boring chamfering edges and thread milling cutters can be selected according to the processing requirements. This tool system has good versatility and high processing efficiency, but the tool cost is high.
The above outlines the functions and features of several common thread milling tools. Cooling is also important when milling threads, and it is recommended to use machines and tools with internal cooling. Because the tool rotates at a high speed, the external coolant does not easily enter under the centrifugal force. In addition to the excellent cooling of the tool, the internal cooling method is more important when the blind hole thread is used to facilitate the chip removal. When machining the small diameter internally threaded hole, a higher internal cooling pressure is required. Ensure that the chip removal is smooth. In addition, in the selection of thread milling tools should also consider the specific processing requirements, such as production batch, screw hole number, workpiece material, thread accuracy, size specifications and other factors, the rational selection of tools.
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