Welcome To Our Website. Any questions about PCD cutting, brazing and grinding, Call Us:+86 17700605088

Application of PCD tools in automobile piston machining

2021-02-01 17:18:55

PCD refers to a polycrystal formed by mixing diamond micro-powder (with a particle size of micrometers) and a small amount of metal powder (such as Co) and then sintering at high temperature (1400 ℃) and high pressure.


The PCD composite sheet supplied as a commodity on the market is a super-hard composite material that is firmly combined with a cemented carbide substrate by a polycrystalline diamond layer under high temperature and pressure. It has the high hardness and high wear resistance of PCD. And both the good strength and toughness of cemented carbide.


Therefore, the tool made of PCD composite sheet is the most widely used diamond tool, which is widely used in the automotive, aerospace, building materials and other industrial fields. The tool made with it has the advantages of high cutting speed, long tool life and low cost of mass machining workpieces, mainly because it has the following performance characteristics that other tool materials cannot match.


PCD tools in automobile piston machining


PCD tool performance characteristics

1. Very high hardness and wear resistance

The hardness of polycrystalline diamond is 3 to 4 times higher than that of cemented carbide, close to natural diamond, and its wear resistance is more than 100 times higher. Because the diamond grains are freely distributed in all directions and have no directionality, the hardness and resistance in all directions are The abrasiveness is consistent, it is difficult for cracks to propagate from one grain to another, and its crack resistance is better than that of single crystal diamond.


2. Low coefficient of friction and high modulus of elasticity

The coefficient of friction between the PCD tool and the workpiece material is lower than that of other tool materials except for single crystal diamond, usually between 011 and 013. The small friction coefficient can reduce the cutting force and reduce the cutting temperature.


The modulus of elasticity of PCD is much larger than that of cemented carbide, so its cutting edge is not easily deformed during the cutting process, and can maintain the original geometric parameters of the cutting edge to a large extent, and keep the cutting edge sharp for a long time.


3. Good thermal conductivity and low thermal expansion coefficient

High thermal conductivity and thermal diffusivity make PCD tools easy to lose cutting heat during cutting, so that the temperature in the cutting zone will be lower and the tool life will be long. The low coefficient of thermal expansion makes the tool less prone to major deformation during the cutting process.


4. Sharp edge and low surface roughness

The edge of PCD tool is very sharp. Generally, the peak value of the edge is less than 5μm, and the radius of the blunt edge of the edge is less than 4μm. In most occasions, the rake face of PCD tools is mirrored, and the surface roughness can reach 0101μm, which can make chips flow out easily along the rake face and reduce the generation of built-up edge.


Application of PCD Tool in Piston Machining

In order to improve engine performance, the engine piston material is changed from low-silicon aluminum alloy to medium-silicon aluminum alloy, and even high-silicon aluminum alloy is used.


The excellent characteristics of PCD make PCD tools widely used in processing aluminum alloys, especially high-silicon aluminum alloys. The hardness and wear resistance of high-silicon aluminum alloy are higher than other aluminum alloys. When cutting, the tool alternately cuts soft aluminum base and hard silicon particles, and ordinary tools are easy to wear. At the same time, the tool is also prone to build-up edge, which will deteriorate the machining accuracy and surface roughness.


In order to avoid built-up edge and work hardening, the cutting edge must be sharp and the cutting face must be smooth. PCD tools meet these requirements.


  • How to cut graphite block?
    24 May 2024

    How to cut graphite block?

    Graphite is a brittle material with a heterogeneous structure. Graphite cutting is achieved by generating discontinuous chip particles or powder through the brittle fracture of the graphite material.Moresuperhard provide quality diamond cutting wheel for precision cutting hard materials like ceramic,carbide,graphite,silicon etc

  • Ceramic CBN grinding wheel for grinding rotor
    24 May 2024

    Ceramic CBN grinding wheel for grinding rotor

    As key equipment in modern energy conversion and power systems, turbines require extremely high precision and quality in their manufacturing and maintenance processes. The grinding of turbine rotor grooves is one of the important processes, which directly affects the performance and life of the turbine. In recent years, ceramic CBN (cubic boron nitride) grinding wheels have gradually become an ideal choice for grinding turbine rotor grooves due to their excellent hardness, wear resistance and thermal stability. This article will explore the application and advantages of ceramic CBN grinding wheels in turbine rotor groove grinding.

  Add:  Zhongyuan Rd, Zhongyuan District, Zhengzhou, 450001, Henan, China

  Tel: +86 17700605088

  WhatsApp:+86 17700605088

  E-mail: pcd@moresuperhard.com