The EVOlineThread Rolling system continues the productivity advantages of OD threadforming in a new exciting way. Standard of machine screw pitch is the distance from the crest of one thread to the next. Fette Tools is the leading distributor of these rolling systems and provides the best technical service in the industry. Our program range, product quality, experience and service have helped us become the leading distributor of Thread Rolling Products in the industry. We not only offer the broadest rolling program available, but back this up with professional expertise based on our vast experience. Because all applications vary in some manner, each is carefully studied by our engineering staff. In cases of exotic materials, special profiles, or the need for special leads to enhance material flow, Fette Tools offers the best and the most economical solution to your unique application. No other manufacturer offers such a broad range of rolling systems along with the best solution for each customer’s unique application. Additionally, Fette has always driven technological progress, continuously striving to strengthen their position as the leader in thread forming technologies. To potential customers, the initial cost of a thread rolling system may seem like a significant stumbling block.
On the contrary, they may have a different pitch and even a different elevation rate. 2 and 3 the profile height of the entry portion is radially displaced inwardly from that of the calibrating portion. 3 by the dotted line 32, which represents the final profile height. The radial displacement, which is indicated as 34, is also referred to as the elevation rate. Likewise, there is a retraction of the profile height towards the flattened areas 16 and 24 in the exit portion 22 and 30 to facilitate the exiting motion of the roll on the work. This invention relates to a roll for a radial thread-rolling head.
Shorter progressions can be used for work up to shoulders or other workpiece features, but roller life can be affected by the additional stress. Thread rolling success is determined in large part by the shape of the form to be produced. Most of the threads produced are made to the 60 degree Unified and similar standards, which are easily rolled. Most of the rollers used to produce these forms have relatively sharp crests, usually with radius edge to help the die penetrate the material. The angles of these threads, 30 degrees on each flank, provide the force to make the material flow axially and radially in a controlled and predictable manner. NAREX MTE produces and deliveres axial thread rolling heads fixed Zhv and universal heads Zhvu or heads RK . This operation can be done on lathe, it is not necessary thread rolling machine. FETTE Thread rolling heads/ attachments can be used on almost any type of machine tool, including CNC automatic lathes, basic engine lathes, rotary transfer machines, and machining centers.
In the case of heat-treated alloy steels in the usual hardness range of 26 to 32 Rockwell C, the production may be 30 or 40 per minute or less. These production rates are intended as a general guide only. The diameters of rolled threads usually range from the smallest machine screw sizes up to 1 or 1½ inches (25.4 or 38.1 mm), depending upon the type and size of machine. Thread rolling is a type of threading process which involves deforming a metal stock by rolling it through dies. This process forms external threads along the surface of the metal stock. Internal threads can be formed using the same principle, specifically termed thread forming. In contrast with other widely used threading processes such as thread cutting, thread rolling is not a subtractive process. The rolled threaded fasteners offer advantages such as stronger threads, precise final dimensions, good surface finish, and a lower coefficient of friction. Radial Thread RollingRadial Thread RollingIn this process there is use of two or three rolls to form a thread in one rotation of the workpiece blank.
precision thread rolling
Reducing cutting fluid use offers the chance for considerable cost savings. Metalworking manufacturers are under competitive pressures like never before. It’s no longer sufficient to make parts “the way we always have.” Increasingly, matching the best processing technique to a specific application can mean the difference between making money on a job or losing it. In case of fixed head Zhv – YES, in case of universal head Zhvu or RK – NO. Designed for manual reaming of holes in range 7.6÷60mm up to the type of reamer. Even though there are thousands of fasteners to choose from a particular material or finish may not be available in every size and length. So, try different combinations of filters like Size, Grade and Material to see matching Lengths and Finishes. Contact the seller- opens in a new window or tab and request shipping to your location. Adapters are of solid or adjustable type and are designed for selected cross slide positions on the automatics. A large assortment of adapters is available for more than 500 applications.
Thread cutting screws are a class of self-tapping screw that creates threads in existing holes in metal or plastic, and are often used as fasteners in items that need periodic maintenance. Most often used in plastic and metal projects and do not generate the same stress as thread forming screws. Tangential head can make a perfect thread while the center of the work-piece is located in the same point of the center position between 2 rolls. Only 15 to revolutions arerequired to finish the rolling process. So, it gives only little load onti the machine and work-piece. And it dose not regulate the length of thread as far as its diameter is smaller than the internal diameter of the shank. When the diameter to be rolled is much smaller than the diameter of the shoulder preceding it, a cross-slide knurl-holder should be used. If the part to be threaded is not behind a shoulder, a holder on the swing principle should be used. When the work is long (greater in length than two-and-one-half times its diameter) a swing roll-holder should be employed, carrying a support.
2 that behind the claw clutch portion 30a of the shank la an annular motor casing 40 is arranged on shank 1a. Adjacent to the motor casing 40 an annular battery housing 42 is arranged on shank 1a. An electrical motor 44 is received by an eccentric bore of the casing 40 and extends into a bore 46 of the battery housing 42. The reference to an electrical motor is made by way of example only and must not be interpreted as any limitation. A spring housing 2 with a central bore is arranged on a bearing portion 32 and comprises a claw clutch portion which cooperates with the claw clutch portion 30 of the shank 1. In the spring housing 2 a helical spring 10 is arranged, the outer end of which cooperates with a slot within the spring housing 2. The inner end of the helical spring 10 is connected to the portion 32 of the shank 1 .
When the length of the rib stripping is up to the requirements, the rib stripping knife will open automatically. Then turn the handle to continue feeding to realize the rolling thread. When the roller contacts the steel bar, it must be forced and make the spindle rotate a circle. When the feed reaches a certain level, the automatic feed can be realized until the whole rolling process is completed and an automatic stop. Press the reverse start button to realize an automatic return. The thread rolling cylindrical dies with good quality have a long service life and the use of joint surcharge is also minimal. Thread forming and thread rolling, while both involving the creation of threading, aren’t the same.
It offers the highest strength compared to other metals and elements, but is the least corrosion resistant. This general purpose head has a flat bearing surface with a short disc-like body and a slightly rounded top surface. Can be used in most situations when general bearing strength is needed. A general designation for the most common and popular stainless steel, referring to the 18% chromium and 8% nickel. It’s strength has a range from the middle to low end of the grade scale. All 300 series stainless steel share the ratio of chromium to nickel with varying other elements improving different properties. It has higher corrosion resistance than the 400 series stainless steels and it is non-magnetic. This finish, also know as zinc plating, zinc chromate or dichromate provides good corrosion resistance and is the standard for many hardware fasteners. It is an electroplated zinc layer covered with a chromate post-treatment. The zinc protects the steel from corrosion and the chromate layer protects the zinc from degrading.
Chamfer angle–A common mistake in thread rolling is starting with an angle on the pre-rolled blank that is the same as the angle to be produced on the finished part. Like the blank diameter, the pre-rolled chamfer angle will be altered by the displacement of material during the thread rolling process. Start a thread rolling project around 100 to 120 sfm and increase the speed in 50 to 100 rpm increments. Watch for the speed point that produces the least amount of load. This will be the optimum rpm for the application, automatically taking into account material, hardness, diameter, pitch, head size and horsepower. Wagner tangential thread rolling attachments are utilized for rolling threads short threads, close to the shoulder, or behind the shoulder of a part. Wagner thread rolling attachments roll highly precise thread profiles as both of the rolls are synchronized by a gear box. By means of adjustment screws the thread rolls can be adjusted precisely. LMT Fette rolling heads can also be used to produce serrations with a gap angle of about 90°. In order to be able to provide workpieces with the required number of teeth, a master pinion is installed with axial spring action between the rolls.