Practical Work Drilling Holes In Metal

Holes in sheet metal can be obtained by punching or drilling. For punching holes with a diameter of up to 8 mm, a punch (beard) is used. A steel rod with a flat working surface (Fig. 81).A sheet of tin is placed on the end of a wooden block, the punch is installed at the desired point, and a hole is punched with the help of a bench hammer. The edges of the resulting hole on the underside of the sheet are leveled with a hammer or hammer.In factories, to obtain holes in sheet metal, a special tool is used instead of a punch. A punch. Punch holes in the stamping press (Fig. 82). A sheet or several sheets are laid on a matrix with one or more holes. A punch or several punches under pressure enter the matrix and punch holes, pushing the waste. Circles with a diameter equal to the diameter of the holes. Precise holes in the metal can be obtained by drilling. At the same time, the same methods and rules of safe operation are performed as when drilling holes in wood. The location of the hole is marked with a punch, so that the drill does not slip over the workpiece (Fig. 83).

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Practical Work Drilling Holes In Metal

Practical Work Drilling Holes In Metal

Drilling is carried out with a hand drill, electric drill (Fig. 84) or on a drilling machine. When drilling sheet metal, an ordinary spiral drill crushes and tears the workpiece. In this case, drills with special sharpening are used (Fig. 85, a). A wooden block is placed under the blank (Fig. 85, b, c).

1. When punching holes, use a working hammer. Do not hold your fingers near the working part of the punch.
2. Securely fasten the part in a vice or on a table when drilling.
3. Check the reliability of fixing the drill in the chuck.
4. When drilling, do not press the handle of the drill strongly.

Punching and drilling holes
1. Drill holes in the suspension (see Fig. 59, a), the handle of the household scoop (Fig. 86), the hook for the hanger (see Fig. 59, b) and other details, having previously marked their position with a center punch.

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2. Using the holes in the handle, mark the holes in the back of the scoop body (see the routing on page 70) and punch them with a punch.

  • Drilling, punch, stamping press, punch, electric drill.

1. What are the tools used in the training workshop for making holes in the workpieces.

2. For what purpose, when punching and drilling holes, a wooden block is placed under the sheet blank?

3. Why are drills with special sharpening used for thin sheet metal drilling?

4. Why is it necessary to reduce the pressure on the workpiece at the end of drilling?

5. Why, when drilling with a drill, should the axis of rotation of the drill be strictly perpendicular to the plane of the workpiece?

6. What is the difference between a punch (beard) and a punch?

A.T. Tishchenko, P.S. Samorodsky, V.D. Simonenko, N.P. Schipitsyn, Technology Grade 5
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