Safe handling of metal cutting tool sets

Metal cutting tool sets such as burins, hand saws, taps, and wrenches play an important role in metal cutting and care is required when using them. The following is a detailed description of the precautions for the tool sets.

Here is the content list:

l Burin tool

l Hand saw tool

l Taps and teeth tool

Burin tool

① Burin is a tool for burring, usually made of carbon steel, not high-speed steel for burin. The hardness is HRC (48-52) after thermal solution; burin top is not allowed to quench, not allowed to have cracks and burrs; 

② Ordinary burin burr the surface of the blank, pouring mouth and split material available flat burin (broad burin); burin groove and split curve-shaped plate material available pointed burin (narrow burin); burin oil groove using oil groove burin; 

③ Hold burin way and operation to the right. The burin should be held with the middle finger, ring finger, and pinky finger of the left hand, the thumb and index finger naturally together, the head of the burin sticks out about 20mm; such as reducing the vibration of the burin striking the hand, the burin should not be held too tight; 

④ Burin, should be gently burin from the work side of the sharp corner, burin open gap and then work with the full edge, otherwise, the burin easy to pop open or slip; cutting from the end of the workpiece at 10n, should turn around burin; 

⑤ To prevent the hammer from the burin end slip off when hitting the hand can be set above the burin handle grip - a foam rubber pad; to prevent flying chips or debris injury, the operator should wear goggles, the workbench should be placed on the steel mesh guard; 

⑥ Burin tip should be a slightly spherical shape, if there is a flying edge roll spur should be promptly trimmed to ensure that the hammering force through the burin centerline.

Hand saw tool

Hand saw blade mostly made of carbon tool steel and alloy tool steel, and hardened by thermal solution.

Hand saw in use, saw blade breakage is an important factor leading to injury. Therefore, in the use of the following matters should be noted: 

① Should be by the hardness and thickness of the material processed to the right choice of the saw blade; saw blade installation elasticity should be moderate, by the hand sense at any time to adjust; 

② Sawed workpiece to clamp, sawing can not have displacement and vibration; sawing line from the workpiece support point to be close; 

③ Sawing to support the saw bow, to prevent skew, start sawing to be smooth, starting sawing angle should not exceed 15 °, the angle is too large, the saw teeth are easy to workpiece clamping; 

④When sawing, push the saw forward with both hands to the appropriate force; backward sawing, the hand saw should be slightly raised, do not apply pressure. The size of the force should be by the hardness of the workpiece to be cut and the formulation, the hardness of the large force can be added more, the hardness of the small can be added less; 

⑤ Installation or transfer of new saw blade, the necessary attention to ensure that the direction of the tip of the saw blade teeth to face forward; sawing halfway after the transfer of the new article, should be turned around sawing, inappropriate to continue along the original saw mouth sawing; when the workpiece is almost cut by the saw, the application of hand-holding, so as not to fall to hurt feet.

Taps and teeth tool

Taps and wrenches are tools for cutting internal and external screws. Ordinarily made of tool steel or high-speed steel, and quenched and hardened by thermal solution. There are two types of taps: hand taps and machine taps; there are round taps and cylindrical pipe thread taps. Attention should be paid to tapping and threading: ①The end hole should be chamfered during tapping; the tap should be coaxial with the workpiece hole; axial pressure should be applied at the beginning of tapping to make the tap cut in. After a few turns, there is no need to apply Axial force; ②When the tap is calibrated for some entry screw holes, it will return 1/4 or 1/2 turn every half turn to one turn so that the chips will be broken and then tapped down; when tapping the through-hole, it must be withdrawn frequently Tap for chip removal.

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