Tips for selecting the indexable turning tool blades in common machine clamps

The blade of the outer circle of the car: The selection principle is mainly determined according to the specific conditions of the processing technology. Generally, choose the blade with higher versatility and with more cutting edges on the same blade. Choose a larger size for rough turning, and a smaller size for fine and semi-finished turning. S-shape: Four cutting edges, short cutting edge (referring to the same inscribed circle diameter), high cutting edge strength, mainly used for 75°, 45° turning tools, and for processing through holes in inner hole cutters. T-shape: Three cutting edges, long cutting edge and low cutting edge strength. When used on ordinary lathes, blades with auxiliary deflection angles are often used to improve the cutting edge strength. Mainly used for 90° turning tools. In the inner hole turning tool, it is mainly used for processing blind holes and stepped holes.

C-shape: There are two tool nose angles. The two cutting edges with a 100° nose angle are of high strength. They are generally made into 75° turning tools for rough turning of the outer circle and the end face. The two cutting edges with a 80° nose angle have higher strength, and you don’t need to change the tool. It can machine end faces or cylindrical faces, and is generally used for machining stepped holes in internal turning tools. R shape: round cutting edge, used for processing special arc surface, high blade utilization, but large radial force. W shape: Three cutting edges are relatively short, the cutting edge angle is 80°, and the cutting edge strength is higher. It is mainly used for processing cylindrical and stepped surfaces on ordinary lathes.

D-shape: Two cutting edges are long and the tip angle is 55°. The tip strength is lower. It is mainly used for profiling processing. When it is made into a 93° turning tool, the cutting angle should not be greater than 27°～30°; When making a 62.5° turning tool, the cutting angle should not be greater than 57°-60°. It can be used for stepped holes and shallow root removal when machining inner holes. (Guide: Two misunderstandings of technical personnel on thread standards)

V-shape: Two cutting edges are long and the cutting edge angle is 35°. The cutting edge strength is low, and it is used for profiling processing. When making a 93° turning tool, the cutting angle is not more than 50°; when making a 72.5° turning tool, the cutting angle is not more than 70°; when making a 107.5° turning tool, the cutting angle is not more than 35°. Fig. 1 Fig. 2 Ordinary Q-shaped blade Fig. 3 Cutting blade with chip breaker groove Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Cutting and grooving blade: Cutting blade: Q is commonly used on ordinary lathes Shaped blade, this blade can be re-grinded, and the price is generally lower for indexable turning tool blades 2 ~ 3 yuan / piece, its disadvantage is that the cutting edge is straight, can not cause the chip to shrink and deform laterally, and it is easy to match the machined surface Friction, and its slip angle and side clearance angle are very small, so the cutting heat is high, easy to wear, you should always observe the cutting edge when using it, and regrind or replace the blade in time.

Generally, cutting blades that directly press chip-breaking grooves are used on CNC lathes, which can cause the chips to shrink and deform laterally, cut lightly, and reliably break the chips. In addition, its side angle and side clearance angles are very large. The cutting heat is less, and the service life is longer, but the price is higher. Grooving blades: general cutting blades for deep groove cutting, forming blades for cutting shallow grooves, such as the following: vertical grooving blades, flat grooving blades, strip grooving blades, and stepped arc root groove blades. The groove width cut by the blade has a high precision.

Threaded blade: L-shaped blade is commonly used. This blade can be reground and is cheap, but it cannot cut the top of the tooth. The thread with higher cutting precision needs to use a tooth-shaped blade. Because the tooth shape size of the internal and external thread is different, it is divided into internal and external thread blades. The thread pitch is fixed and the tooth top can be cut. As a clamping method, it is divided into two types. One is the blade with no holes and the upper pressure clamp is used. This kind of blade needs to add a chip plate when processing materials with higher plasticity, such as; the other is Press out the chip breaker and the blade with clamping hole, it is clamped with the press hole type Torx screw.

Cutting edge length Cutting edge length: should be selected according to the amount of back-grabbing. Generally, the cutting edge length of through-groove inserts should be ≥1.5 times the amount of back-grabbing, and the cutting edge length of closed-groove inserts should be ≥2 times. The back of the knife.

Tool nose arc: When the rigidity is allowed, use a larger tool nose arc radius as long as the rigidity is allowed, and generally use a smaller arc radius for fine turning, but when the rigidity is allowed, a larger value should be used. For selection, the radius of the commonly used press forming circle is 0.4; 0.8; 1.2; 2.4 and so on. Blade thickness Blade thickness: The selection principle is to make the blade have enough strength to withstand the cutting force. It is usually selected according to the amount of back feed and feed. For example, some ceramic blades should choose a thicker blade. Blade method clearance angle Blade method clearance angle: commonly used are: 0° code N; 5° code B; 7° code C; 11° code P. 0° clearance angle is generally used for rough and semi-finish turning, 5°; 7°; 11°, generally used for semi-finish, fine turning, profiling and machining inner holes. Blade precision Blade precision: 16 kinds of precision are stipulated by the country for indexable blades, of which 6 are suitable for turning tools, code-named H, E, G, M, N, U, H is the highest, U is the lowest, rough and semi-finishing on ordinary lathes Use U-level, or use M for CNC lathes that require higher tool tip position, and use G for more advanced ones.

More related metal stamping industry news: