Generally, the tap extrudes with greater efficiency at higher RPMs but it is also possible to run the tap at lower speeds with satisfactory results.Ĭounter Sinking or Chamfering Helpful: Because these taps displace metal, some metal will be displaced above the mouth of the hole during tapping. Spindle Speeds: For most materials, spindle speeds may be increased over those recommended for conventional cutting type taps. We recommend MQL Systems Dry-Cut Cutting Fluid. Standard Lubrication: In general it is best to use a good cutting oil or lubricant rather than a coolant for cold forming taps. It is unnecessary to have lead screw tapping equipment in order to run the cold forming tap because the tool will pick up its own lead upon entering the hole. No Lead Screw Necessary: These taps work equally well when used in a standard tapping head, automatic screw machine, or lead screw tapper. On most applications, therefore, conventional equipment is suitable for driving cold forming taps. Torque: Where the operation calls for 75% of thread or less, the torque required varies with the material from no additional torque to 50% additional torque. These tools, with four threads of taper, will require less torque, will produce less burr upon entering the hole, and will give greater life. Copper and copper alloys (ductile brasses)Ĭold Forming Tap Application Information Tapping Application The Same: Except for changes in hole size, the application of cold forming taps differs in no way from conventional cutting taps.īlind Hole Tapping Possible: Whenever possible, in blind holes, drill or core deep enough to permit the use of the plug style taps.Aluminum die casting alloys (low silicon).Examples of material classes which have been tapped are: Surface damage may cause torque to increase to a point of stopping the machine or breaking the tap.Ĭold forming taps have been recommended for threading ductile materials. This may be accomplished by using sharp drills, correct speed and feeds. Material Recommended: Care must be taken to minimize surface damage to the hole when tapping materials which are prone to work harden. The resulting thread has a burnished surface. The cold forming tap has neither flutes nor cutting edges and therefore, it produces no chips and cannot create a chip problem. These grain fibers are not cut away as in conventional tapping. The desired thread is formed in the metal under pressure and the grain fibers, as in good forging, follow the contour of the thread. It may be less expensive in the long term.Internal threads can be produced by a cold forming or swaging process. These new tap holders are more expensive than standard collet holders, but if your shop is having trouble holding depth on rigid tapped holes or getting optimum tap life, it may be worth trying the new tap holder design. As testimony, a SynchroFlex holder that had tapped more than 1.5 million holes was recently checked and found to still have the same force to deflection ratio as it had when new. It is only used for the axial compensation. Torque is not transmitted through the flexure. The movement of the flexure is limited to a safe operating range so it is not overstressed. The flexure is designed for long term duty. Measuring the thrust forces shows that a solid holder can exert 84 times greater axial forces on the tap than when using a SynchroFlex tap holder doing exactly the same rigid tapping operation. Even though the discrepancy between the machine synchronization and the tap pitch is very small, the forces exerted on the tap with a solid holder are high.
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