In threaded rolling, metal stock is deformed during the threading process by being rolled through dies. Using this method, external threads are created along the metal stock’s surface. The same principle, known as thread formation, can be used to create internal threads. Thread rolling is not a subtractive procedure, unlike other commonly used threading techniques like thread cutting. Stronger threads, exact final dimensions, good surface quality, and a lower coefficient of friction are just a few benefits of rolling threaded fasteners. Read More…
H & R Screw Machine Products, Inc.Reed City, CA | 231-832-2356
H & R Screw Machine Products-ISO 9001-certified manufacturer of high-volume screw machine products for many industries. We also produce CNC turned parts and provide machining of customer supplied castings, forgings and stampings.$$$
Thuro Metal Products, Inc.Brentwood, NY | 800-238-3929
It is Thuro’s mission to be the leading choice for screw machine parts, and to offer our products at the highest quality and the lowest cost. Our team members dedicate themselves to ensuring that our customers receive the perfect part on time, every time.$$$
Pacific West America, Inc.Calabasas, CA | 866-317-0208
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GrovTec MachiningWood Village, OR | 503-557-4689
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GROOV-PIN CORPLincoln Park, NJ | 973-628-0002
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Alpha Omega Swiss, Inc.Yorba Linda, CA | 714-692-8009
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Threaded fasteners produced through thread rolling are non-permanent couplings that can be mechanically loosened or disassembled. Lead screws and power screws are categorized as mechanical drives or mechanisms. These machine components deliver electricity to other machine sections while regulating movement.
Thread Rolling Processes
There are three main categories for thread generation processes:
The way the thread is created or shaped varies between these. For example, cutting procedures are more commonly used to describe subtractive processes.
Internal threads are created through the thread machining procedure of tapping. This uses a cylindrical tap, or conical cutting instrument. The many cutting edges on the tap resemble an external thread.
The tap is rotated while being axially advanced farther into the metal stock's bore to produce the internal thread.
Single-point cutting uses a lathe machine, where the metal stock is clamped and rotated. A carriage fed linearly by a lead screw positions the cutting tool. This procedure can create both internal and external threads.
Compared to tapping or die-cutting, this procedure takes longer. It has the benefit of producing several threads with just one cutting tool.
This method is employed to create external threads. It uses a similar degree of force and cutting motion to tapping. The metal stock is cut using a die, with several cutting points that resemble internal threads. Several die designs can be self-opening or solid.
Chasing uses a thread chaser, a collection of assembled single-point cutting tools. To cut the thread, a chaser is commonly attached to a lathe's carriage that is gradually indexed.
During the milling procedure, the stock is threaded using one or more rotary cutting tools. The cutting tool is not only rotated and indexed axially, as in tapping and die-threading, but it also revolves around the perimeter of the threaded surface. Internal and external threads can both be produced via thread milling.
In this operation, the molten metal is injected or poured into a die or mold. The threaded part's negative form is contained in the die. To create precise threads, this procedure needs further machining operations. Therefore, fine threads cannot be produced with this method.
Advantages of Thread Rolling
Using a rolled screw press product has both many benefits and drawbacks. The product's stronger finish and dimensional correctness are thread rolling's key benefits. However, this technique relies on metal deformation. Therefore, it can only be used on soft metals and has higher tooling costs.
High Thread Strength
Thread rolling is known as a cold working procedure since it is often carried out at relatively low temperatures. It is well known that cold working can create stronger parts without additional heat treatment. Rolling is a good threading method for materials that don't respond to heat treatment. Compared to cut or ground threads, rolled threads are 10–20% stronger.
Good Surface Finishes
Without requiring further polishing steps, thread rolling naturally produces smooth and burnished threads. Any unevenness on the thread's surface is removed by the strong compressive forces that distort the metal. Cut threads normally have a surface roughness of 64 to 125 micro-inches Ra, whereas rolled surfaces typically have a surface roughness of 8 to 24 micro-inches Ra. Additionally, rolled threads are free of burrs, chatter marks, tears, and cutting marks.
Since no material is removed from the stock during the rolling thread process and the dies used are mirror images of threads to be manufactured, the procedure may produce parts with high precision and accuracy over an extended period. This is true as long as the dies are precise and produced with enough hardness.
Disadvantages of Thread Rolling
Rolling dies must be exact and firm. Thread dimensional precision will be poor if the die is deformed. In addition, the needed hardness makes it challenging to fabricate the dies precisely.
Not Suitable for Hard Materials
Most thread rolling is done using malleable metals. Although feasible, thread rolling is not performed for metals with a Rockwell hardness greater than 40. Thread grinding is more useful above this hardness level. In addition, tool life is markedly decreased while rolling hard materials.