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Removable tap chasers and tap systems including the same

A technology of screw tapping and combing knife, which is applied in the direction of thread cutting tools, manufacturing tools, thread cutting devices, etc., can solve the problem that the screw tapping system cannot be used, achieve the advantages of flexibility and the scope of application, improve quality, increase length and persistent effect

Inactive Publication Date: 2006-03-15
KENNAMETAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] While the removable and replaceable nature of the tap combs in collapsible and non-foldable tap systems gives them unique advantages over fixed taps, removing even a single tap from such systems Comb knives will also render the entire screw tapping system unusable for a period of time

Method used

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  • Removable tap chasers and tap systems including the same
  • Removable tap chasers and tap systems including the same
  • Removable tap chasers and tap systems including the same

Examples

Experimental program
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Effect test

example 1

[0056] Conventional extending high-speed corrugated screw tapping bits and extending uncoated carbide material screw tapping bits constructed in accordance with the present invention were formed on cast copper (85-5-5 -5) Holes in workpieces tap internal threads. Screw taps basically have the same thread shape and geometry. The cutting conditions are as follows:

[0057] ● Surface speed - 200 feet per minute (61 meters per minute)

[0058] ● Rotation speed - 612 revolutions per minute

[0059] The diameter of the hole to be tapped - 1.266 inches (32.16 mm)

[0060] ● Pitch to be formed - 14 teeth per inch (0.071 inches)

[0061] The thread shape that will be obtained by tapping the thread - National Taper Pipe Thread (NPT)

[0062] ● Coolant - no coolant is used

[0063] Test results such as Figure 11 (a) is shown in the diagram. The high-speed corrugated screw comb successfully tapped approximately 13,000 internal holes before the screw tap wore out beyond use. By c...

example 2

[0065] In a second comparative test, a conventional extending high-speed corrugated screw tap and an extending uncoated carbide screw tap constructed in accordance with the present invention were formed on cast red by using the following cutting conditions. Tapping internal threads for holes in copper (85-5-5-5) workpieces. Screw taps basically have the same thread shape and geometry. The cutting conditions are as follows:

[0066] ● Surface speed - 300 feet per minute (91 meters per minute)

[0067] ●Spin speed - 500 revolutions per minute

[0068] The diameter of the hole to be tapped - 2 inches (51mm)

[0069] Pitch to be formed - 11.5 teeth per inch (0.087 inches)

[0070] The thread shape that will be obtained by tapping the thread - National Taper Pipe Thread (NPT)

[0071] ● Coolant - no coolant is used

[0072] Test results such as Figure 11 (b) as shown in the diagram. Using the machining conditions described above, the high-speed corrugated screw tap tapped ...

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Abstract

The present disclosure provides a removable tap chaser for tapping an internal thread in a hole in a workpiece. The tap chaser consists of at least one carbide material and is adapted to be removably mounted on a tap system such as, for example, one of a collapsible tap system and a non-collapsible tap system.

Description

technical field [0001] The invention discloses a screw tapping comb cutter which is removable and replaceable and suitable for a screw tapping system. One aspect of the present invention provides, inter alia, a screw tapping comb that is removable, replaceable and suitable for use in collapsible and non-collapsible tapping systems, the tapping comb designed for a single pass through a workpiece When cutting out the internal thread. The novel screw tapping comb of the invention can significantly improve machining productivity, reduce the cost of machined parts, prolong tool life and improve thread quality and smoothness. Background technique [0002] "Tapping" is generally defined as the machining process that produces internal threads. Known in the prior art of machining, a "tap" is a thread-cutting tool which has cutting elements of the desired shape on the circumference. The screw tap performs axial movement simultaneously with the rotational movement, thereby cutting o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23G5/00B23G1/16
CPCB23G2210/04B23G5/14B23G2200/10B23G5/16B23G5/06Y10T408/03
Inventor 爱德华·C·沃尔夫唐纳德·G·巴尼斯V·布赖恩·舒克
Owner KENNAMETAL INC
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