JPS62165822U

JPS62165822U -

Info

Publication number: JPS62165822U
Application number: JP5398186U
Authority: JP
Priority date: 1986-04-10
Filing date: 1986-04-10
Publication date: 1987-10-21
Also published as: JPH035385Y2

Description

[Brief explanation of the drawing]

図面は本考案の一実施例を示すものであり、第
１図は本考案を適用するタンデム型マスタシリン
ダの縦断側面図、第２図は穿孔加工装置の平面図
、第３図は第２図の―線断面図、第４図は第
２図の矢視拡大図、第５図は第４図の矢視図
、第６図は第５図の―線断面図、第７図は第
５図の―線拡大断面図、第８図は第５図の
―線拡大断面図、第９図は第４図の―線拡
大断面図、第１０図はドリルの先端拡大図、第１
１図は実験結果を示すグラフである。１…ワークとしてのシリンダボデイ、１ａ…開
口端面、５…有底穴、５ａ…閉塞端面、２８，３
０…小径孔、３３…位置決め穴としての挿通孔、
３７…挿入体、５６，５７…ピアスパンチ、８５
…突起、９０…ガイドピン。 The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional side view of a tandem type master cylinder to which the present invention is applied, FIG. 2 is a plan view of a drilling device, and FIG. 3 is a diagram of FIG. 4 is an enlarged view of FIG. 2 in the direction of the arrow, FIG. 5 is a view of FIG. 4 in the direction of the arrow, FIG. 6 is a sectional view of FIG. Figure 8 is an enlarged cross-sectional view along the line - of Figure 5, Figure 9 is an enlarged cross-sectional view of Figure 4 along the line, Figure 10 is an enlarged view of the tip of the drill,
Figure 1 is a graph showing the experimental results. DESCRIPTION OF SYMBOLS 1... Cylinder body as a workpiece, 1a... Open end surface, 5... Bottomed hole, 5a... Closed end surface, 28, 3
0...small diameter hole, 33...insertion hole as a positioning hole,
37...insertion body, 56,57...piercing punch, 85
...Protrusion, 90...Guide pin.

Claims

[Scope of utility model registration request]

The insert body, which is inserted into a bottomed hole of a workpiece having a positioning hole at the open end until it is regulated by the open end surface of the workpiece to determine its axial position, has a small diameter hole drilled therein and an inner end periphery of the small diameter hole. A piercing punch that is driven radially outward of the bottomed hole in order to perform the curve forming of the hole is held, and a guide pin is provided to fit into the positioning hole and determine the position in the circumferential direction. In a device for drilling small-diameter holes in the wall of a workpiece that has a bottom hole, a protrusion with a flat tip is attached and detached to the tip of the insert to crush the center residue left on the closed end surface when drilling a bottomed hole. A device for drilling small-diameter holes into the wall of a workpiece having a bottomed hole that freely protrudes.