JPS5823528Y2 - Milling cutter jig - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a milling cutter jig for processing the surface of a sheet with manual holes such as a boiler header.

Conventionally, in the land boiler header o1, as shown in Fig. 1, a person's hand is inserted into the header 01 when welding the partition plate 02, cutting it, or inspecting the inside of the header 01. There is a hand hole o1a for the operation, but there is no hand hole o1a for the
1a needs to be closed by attaching a hand hole cover from the inside of the header 01 (D).

Figures 2 to 4 are diagrams showing how to attach the hand hole cover. After placing the sheet surface 01b on the inside of the hand hole o1a as shown in Figure 2, the hand hole cover 21 is attached as shown in Figure 3. and tightening member 22. After fixing the hand hole cover 21 with the tightening port 23 and nut 24 and welding the welded portion 25, the tightening member 22. Remove the tightening bolt 23.

Generally, a travel type drill press installed in the factory is used to process the seat surface 01b of the hand hole 01a described above, but in the field, the seat surface 01b is located inside the header 01 and is difficult to see from the outside. .

There is no small and lightweight milling cutter jig, and conventional travel drill presses are difficult to install and fix on site.

It was considered impossible for several reasons.

In view of the above, the present invention is designed to improve boiler header 01 even on site.
It is an object of the present invention to provide a milling cutter jig that can cut the seat surface 01b of the hand hole 01a, etc.

An embodiment of the present invention will be described below with reference to FIGS. 5 to 10.

In Figures 5 to 7, 1 is a boiler header, 1a is a hand hole, 2 is an underframe, and 3 is a tool box supported movably on the underframe 2, and a dovetail groove 3a bored in its side wall. A protrusion 2a protruding from the inner wall of the underframe 2 is fitted into the frame.

Reference numeral 5 denotes a □-ring cutter having incisors 5a, which is fixed to one end of a shaft 5b by a fixing screw 5c, and the shaft 5b is supported by the tool box 3.

6 a and 6 b indicate screws provided on the same axis with the tool box 3 in between, and the screw 6 a is screwed into the underframe 2 and one end is brought into contact with the tool box 3 .

The screw 6b is screwed into the tool box 3, and one end is brought into contact with the fixing member 2c of the underframe 2.

4a is a fixing hole provided in the fixing member 2C.

How to use the □-ring cutter jig with the above configuration is to insert the milling cutter 5 into the hand hole 1a as shown in Fig. 8, and then penetrate the fixing hole 4a and the hand hole 1a as shown in Fig. 9. The jig is fixed to the header 1 by tightening the bolts 7.

Thereafter, the shaft 5b of the milling cutter 5 is gripped and rotated by a drill 8 supported by the frame 9, whereby the milling cutter 5 is rotated and the seat surface 1b of the hand hole 1a is cut.

At this time, turn the screws 6 a and 6 b to remove the tool box 3.
By sliding in the direction of the arrow in FIG. 5A, the sheet surface 1b can be processed as shown in FIG. 11.

Furthermore, a bearing may be provided in the tool box 3 to support the shaft 5b of the milling cutter.

As described above, the milling cutter jig according to the present invention is used to cut the inner surface of a cylindrical body. A tool box that supports the axis of a milling cutter that cuts the inner surface of a cylindrical body, an underframe that supports the tool box so that it can move relatively in the direction of the generatrix, and a tool box on the same axis along the generatrix with the tool box in between. a pair of screws provided in the underframe and screwed into either one of the underframe or the tool box and abutting the other, and two fixing holes in the underframe and a hole in the cylindrical body communicating with the two fixing holes. Since it is equipped with a pair of bolts and nuts that penetrate through and tighten and fix both, it is possible to process the hand-hole sheet surface of the inner surface of a cylindrical body such as a boiler header even if the button is installed on site.

Furthermore, the structure is compact and lightweight, making it extremely easy to transport to the site, easily attaching and detaching from a cylindrical body, and allowing precision milling.

Furthermore, since the underframe is fixed to the cylindrical body using a pair of bolts and nuts inserted through holes provided in the cylindrical body, there is no need to damage the outside of the cylindrical body during fixation. There are advantages such as no

[Brief explanation of the drawing]

Figure 1 is a partial perspective view of the boiler header, Figure 2 is an enlarged partial longitudinal cross-sectional view of the hand portion of the boiler header, and Figure 3 is a partial perspective view of the boiler header.
Figure 4 is an explanatory diagram showing how to install the hand hole cover, Figure 5 is
10 to 10 show an embodiment of the present invention, FIG. 5 is a plan view, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5,
FIG. 7 is a sectional view taken along the line ■--■ in FIG. 5, and FIGS. 8 to 10 are partially sectional side views showing how the jig according to the present invention is used. FIG. 11 is an explanatory diagram of the sheet surface. 5...Milling cutter, 5b...
Axis, 3...Tool box, 2...Underframe.

Claims (1)

[Scope of utility model registration request] A toolbox that supports the shaft of a milling cutter that cuts the inner surface of a cylindrical body that is cut around a plurality of holes drilled at intervals along the generatrix of a cylindrical body such as a boiler header, and the toolbox. and an underframe that supports the tool box so as to be relatively movable in the direction of the generatrix, and are provided on the same axis along the generatrix with the tool box in between, and are screwed to either the underframe or the tool box, respectively, and are respectively screwed to the other. A pair of screws are brought into contact with each other, and a pair of bolts and nuts are inserted through two fixing holes in the underframe and a hole in the cylindrical body communicating with the two fixing holes to tighten and fix both. A milling cutter jig featuring: