Grader End Bit 9J4406 Earth Moving Machinery Spare Parts

Knife corner

In the construction machinery industry, "tool Angle" usually refers to the combination of geometric angles of the cutting part of a tool, which jointly determine the cutting performance, tool life and processing quality. The core perspectives include:

I. Definition and Function of Core Cutting Angle ‌

Anterior Angle (γ₀) ‌

The Angle between the base surface and the rake face directly affects the sharpness of the tool and the cutting resistance.

Selection principle ‌ : the higher the hardness of the material, the smaller the rake Angle; For rough machining, take the smaller value (to enhance strength), and for fine machining, take the larger value (to improve smoothness).

Rear Angle (α₀) ‌

The Angle between the cutting plane and the rear tool face reduces the friction between the rear tool face and the workpiece.

Optimization direction ‌ : For fine processing, a larger relief Angle (6° to 12°) is required, while for hard materials, a smaller value is taken.

Principal deviation Angle (κᵣ) ‌

The Angle between the main cutting edge and the feed direction controls the back force and the cutting thickness.

Application scenario ‌ :

When the system rigidity is high, take a smaller value (such as 45°) to increase the tool life.

When processing stepped or right-angle workpieces, a 90° main deflection Angle is required.

Edge Angle (λₛ) ‌

The Angle between the main cutting edge and the base surface determines the chip flow direction and the strength of the tool tip.

Function ‌ : The positive edge Angle is conducive to chip removal, while the negative edge Angle enhances the impact resistance of the tool tip.

(Insert a schematic diagram of the tool Angle here to show the spatial relationship of each Angle.)

Ii. Correlation between Auxiliary Angles and Processing Quality ‌

Secondary deflection Angle ‌

The Angle between the secondary cutting edge and the opposite direction of the feed affects the roughness and friction of the machined surface. Reducing the secondary deflection Angle can improve the surface quality, but vibration should be avoided.

Knife nose radius ‌

The radius of the tool tip arc, a larger tool nose radius can disperse the cutting heat and improve the surface finish, but a larger one will increase the cutting resistance.

(Insert a rich media card here: Video Analysis of Turning tool angles/Angle Configuration Table for Different Working Conditions)

Iii. Special Considerations for Construction Machinery Processing ‌

Material adaptability ‌

When processing high-hardness alloys, carbide tools with negative rake angles or zero relief angles should be used to enhance the strength of the cutting edge.

Chamfering process optimization ‌

For complex structures such as C-shaped parts, special fixtures need to be designed (such as by inserting spacers for step-by-step processing) to ensure the stability of the tool angles.

Cutting force control ‌

A reduction in the principal deflection Angle will significantly increase the dorsal force, which needs to be matched with the rigidity of the machine tool. Increasing the cutting edge Angle during rough turning can reduce the feed resistance.

Summary ‌

The combination of tool angles needs to be dynamically adjusted based on the material of the workpiece, the processing stage (rough/fine), and the rigidity of the system.

Wear resistance priority ‌ : reduce rake Angle/relief Angle, increase tool nose radius;

Surface quality priority ‌ : increase the relief Angle/secondary deflection Angle in coordination with the rake Angle;

High-efficiency cutting ‌ : the main deflection Angle is 75° to 90° to reduce the back force, and the cut edge Angle is increased to reduce the resistance.

Note: In practical applications, parameters need to be further optimized in combination with the tool material (high-speed steel/carbide) and cooling conditions.