JPH0419724U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の一実施例であるねじ切削用タ
ツプの正面図である。第２図は第１図のタツプに
おける切刃の正面形状を説明する図である。第３
図は第１図のタツプの食付き部における切刃の逃
げ形状を示す図である。第４図は第１図のタツプ
における第１完全切刃の逃げ形状を示す図である
。第５図は第１図のタツプの完全山部における第
１完全切刃以外の切刃の逃げ形状を示す図である
。 １０……ねじ切削用タツプ、１８……完全山部
、２０……食付き部、２４，２６……切刃、２４
ａ……第１完全切刃、θ_１……食付き部の切刃の
逃げ角、θ_２……第１完全切刃の逃げ角。 FIG. 1 is a front view of a thread cutting tap which is an embodiment of the present invention. FIG. 2 is a diagram illustrating the front shape of the cutting edge of the tap shown in FIG. 1. Third
The figure shows the relief shape of the cutting edge at the biting part of the tap in FIG. 1. FIG. 4 is a diagram showing the relief shape of the first complete cutting edge in the tap of FIG. 1. FIG. 5 is a diagram showing the relief shape of the cutting edges other than the first complete cutting edge in the complete peak portion of the tap shown in FIG. 10...Tap for thread cutting, 18...Full ridge portion, 20...Change portion, 24, 26...Cutting blade, 24
a...First complete cutting edge, _θ1 ... Relief angle of the cutting edge at the biting part, _θ2 ... Relief angle of the first complete cutting edge.

Claims (1)

【実用新案登録請求の範囲】 形成すべき雌ねじのねじ溝と同一形状の切刃を
有する完全山部と、該完全山部に連続して設けら
れるとともに先端側程小径とされて切刃の形状が
不完全な食付き部とを備えたねじ切削用タツプに
おいて、 前記完全山部に存在する多数の切刃のうち最も
先端側に位置する第１完全切刃の逃げ角を、前記
食付き部における切刃の逃げ角と同程度としたこ
とを特徴とするねじ切削用タツプ。[Scope of Claim for Utility Model Registration] A complete crest having a cutting edge of the same shape as the thread groove of the female thread to be formed, and a shape of the cutting edge that is continuous with the complete ridge and has a smaller diameter toward the tip. In a thread cutting tap having an incomplete chamfer, the relief angle of the first complete cutting edge located at the most distal side among the plurality of cutting edges present in the complete ridge is determined by the chamfering part. A thread cutting tap characterized by having a clearance angle comparable to that of the cutting edge.