Factors affecting the service life of CBN tools

The service life of the tool is directly related to the level of processing cost. A good machine tool also needs to be equipped with a suitable tool to maximize the performance of the machine tool. Similarly, the service life of the tool is also affected by many factors. Understand the factors that affect the use of the tool. , Can improve cutting efficiency and reduce tool wear.

Machine tool

1. The power of the machine tool, the rigidity of the machine tool system, the speed of the spindle of the machine tool, the range of the provided feed, and the strength of the cutting mechanism.

2. The rigidity of a system formed by machine tool-workpiece-tool. For example, whether the workpiece fixture, the rigidity of the tool turret, and the rigidity of the machine tool affect the normal effect of the tool.

3. The guide rail is lubricated in time, and the feed movement is stable without creeping.

4. The gear meshing of the main shaft box is accurate and stable, the main shaft rigidity is good, the rotation accuracy is high, the torque and the bending strength are good, and the stable operation is guaranteed under the impact load.

5. The machine tool coolant selection and lubrication part have no faults.

6. Accuracy and strength of tooling and fixture, rotation accuracy of tool post, position accuracy, accurate transmission of ball screw, large modulus of elasticity and small deflection.

The parameter selection of the tool for cutting processing (blade parameters, geometric parameters, cutting parameters, tool processing materials, etc.)

1. Blade parameters, such as blade model, arc, chamfering, and passivation are appropriate.

2. Tool parameters refer to the spatial angle formed by the blade installed on the tool holder, such as entering angle, rake angle, blade inclination, etc.

3. Cutting parameters (cutting speed, back-cutting amount, feed rate), reasonable cutting parameters should be selected in consideration of actual processing site conditions, including the type of material being processed, whether it is intermittent, hardness, etc., and reasonable selection of linear speed and depth of cut, The amount of knife, etc.

4. The conditions of tool use (cooling method) such as wet and dry cutting, oil cooling, water cooling, and air cooling.

Machine tool material to be processed (workpiece aspect)

1. Material matching, reasonable matching and use of tool materials and processed materials (to avoid chemical wear and metallographic wear).

2. The stability of the workpiece material: 1) Material composition and metallographic structure; 2) Hardness (whether it is changed); 3) Casting process, stable control of sand, pores, and hard spots; 4) Aging time.

The choice of fixture

1. The workpiece and the tool bar are firmly clamped.

2. It has sufficient rigidity and precision.

3. It has a reliable positioning datum.

Surface to be processed (drawing process and technical requirements)

1. The dimensional accuracy of the work piece.

2. The shape and position accuracy.

3. The roughness of the machined surface.

4. The thermal deformation of the work piece.