Improve brass threaded inserts Turning Productivity With Redesigned Multi Plus Inserts
Aus Bildungsstreik 2009
Standard Versus Multi+ Threading Inserts
The traditional method of threading, introduced and popular since the early 1960's, has been the use of lay-down threaded insert. These inserts typically have three cutting corners, each ground in such a way that one corner can produce a thread on a component, even up to the shoulder face of a component.
Depth of thread, a tool with one thread-cutting tooth typically makes 4 to 24 machining passes to produce the finished thread size and fit to the standard gage. The actual number of passes depends on the pitch. The design of full profile brass inserts requires the finished thread form to be in accordance with the relevant international standard (e.g. Whitworth, UN or other). It therefore follows that the design of the nose radius of the insert must comply with the design standard.
Single-tooth inserts are practical for many thread turning applications, especially when machining time is not expected to take long. For example, when machining short threads, soft materials or small batches. However, one major disadvantage of this design is that only one tooth does the cutting and the rate of wear is more rapid.
A single tooth performs both the roughing passes and the finishing pass. With each cutting pass over the workpiece, the tool's nose radius is the part of the insert profile that does most of the work.In addition, the machining of hard materials, such as difficult-to-machine alloys, puts further stress on the nose radius and accelerates the rate of wear. Hence, overall tool life is limited by the ability of the tool's nose to withstand the entire cutting load over several passes.
What are Multi+ Inserts?
Multi+ is a set of multi-tooth inserts, specially designed for high-volume production. These indexable inserts are often used in automotive, fittings, oil, medical and other mass production industries.
Each insert has a series of teeth on the corner or face of the insert. Each tooth is successively larger than the previous one. The first teeth are for roughing and semi-finishing, and they remove the most material. The last tooth does the finish cut. Therefore, only the last tooth is designed to finish the thread to the desired dimensions, according to the thread standard.
Since there are multiple teeth, more material is removed per pass, and fewer passes are needed to machine the thread. The advantage is much shorter cycle times and substantial increase in productivity.
Improved Design Provides Longer Tool Life
The Multi+ inserts have been redesigned to further optimize the distribution of the cutting load. With the new Multi+ inserts, the cutting load is distributed more efficiently, so that the load on final finishing tooth is even lower. The advantage: significantly increased tool life!
Because there are several teeth cutting simultaneously, multi-tooth inserts generate high cutting forces. It is essential that the machine tool has a high level of rigidity.
Internal, Blind Holes
A blind hole is a hole that does not go through the workpiece, meaning the bottom end is closed. If an internal blind hole must be threaded close to the bottom, keep in mind that the finishing tooth on a multi-tooth insert cannot reach all the way to the end of the thread. In this case, a single-tooth insert is appropriate Visit Website.