Qu'est-ce que le procédé d'ébavurage cryogénique ?

19 septembre 2024

In modern manufacturing, deburring or deflashing is an important step to ensure product precision and quality. Whether it is automotive parts, electronic components, or other industrial products, burr problems have always plagued manufacturers. Burrs not only affect the appearance of the product, but may also cause poor operation of mechanical devices and even shorten the service life of the product. Therefore, how to remove burrs efficiently and economically has become a focus of attention in the manufacturing industry. With the continuous advancement of technology, an innovative deburring technology has gradually come into the public eye-cryogenic deflashing process. Compared with traditional deburring processes, this technology has gradually become an indispensable part of industrial automation and precision manufacturing due to its high efficiency and precision. In this article, we will introduce the cryogenic deflashing process in detail, explore its working principle, differences from traditional processes, applicable materials, and its advantages in manufacturing.

Qu'est-ce que le procédé d'ébavurage cryogénique ?

Définition

As the name suggests, the cryogenic deflashing process is a technology that removes burrs by physical means after cooling the workpiece to an extremely low temperature. The principle is to cool the material to a brittle state, so that the burrs on its surface become brittle, and then these burrs are easily removed by mechanical vibration or other physical methods. The common cooling medium is liquid nitrogen, which can quickly cool the material to a low temperature close to minus 150°C, thereby achieving an ideal deburring effect.

Cryogenic deflashing is particularly suitable for some heat-sensitive materials, such as plastics, silicone, and certain soft metals. These materials are easily deformed or damaged at high temperatures, and traditional mechanical or chemical deburring methods are difficult to handle accurately, while low-temperature processes can avoid these problems and achieve the purpose of deburring while maintaining the shape and performance of the workpiece.

Working principle

It mainly includes three steps: cooling, hardening, and mechanical removal:

Cooling: First, the pretreated workpiece is placed in a low-temperature environment, usually a liquid nitrogen refrigeration box, which can quickly cool the workpiece to a temperature close to minus 150°C.

Hardening burrs: At low temperatures, the burrs of the material become fragile, while the main structure remains relatively stable. Due to the different thermal expansion coefficients of different materials, the burr part on the surface of the workpiece often becomes brittle before the main material, making it more fragile.

Mechanical removal: The embrittled burrs will fall off naturally through mechanical vibration or other slight physical stimulation (such as mechanical shot blasting or air flow impact). This process is very precise and will not damage the surface or shape of the workpiece, which is particularly suitable for parts with high requirements for surface finish.

Cleaning and inspection: After deburring, the surface of the workpiece is cleaned again to remove residual debris or other impurities to ensure that the workpiece achieves the expected finish and accuracy.

Quality inspection: Common inspection methods include microscopic inspection, visual inspection or surface measurement instruments to detect the surface flatness and finish of the workpiece to ensure that all burrs have been removed and the workpiece has not been otherwise damaged.

Purpose

The main purpose of cryogenic deflashing is to remove burrs efficiently and non-destructively to ensure the accuracy, surface finish and service life of the workpiece. Another important purpose is to save time and cost. Cryogenic deflashing has a high degree of automation and can process a large number of workpieces at a time, so it has high efficiency in mass production. In addition, since there will be no excessive wear on the workpiece surface or change in material structure, subsequent processing steps can be simplified, thereby further saving production costs.

Avantages

High precision

Since cryogenic deflashing technology relies on temperature differences to embrittle burrs, it does not cause any damage to the workpiece body. This means that even very delicate workpieces (such as electronic components or medical devices) can maintain their shape and size. This high-precision deburring technology greatly improves the product qualification rate.

Suitable for complex geometries

Compared with traditional mechanical deburring, cryogenic deflashing can easily handle some complex part structures, such as grooves, slits, tiny holes, etc. These parts are usually difficult to handle with traditional mechanical methods, while the cryogenic deflashing process removes burrs through liquid nitrogen cooling and vibration, without being restricted by geometric shapes.

Strong material adaptability

Cryogenic deflashing is suitable for processing a range of materials, especially heat-sensitive materials. For example, plastics, plastics and some soft metals are easily deformed or damaged under high temperature or strong mechanical action, while the cryogenic deflashing process can remove burrs without heating or applying too much mechanical pressure, retaining the original physical and chemical properties of the material.

Efficient and automated

The entire process of the cryogenic deflashing process can be highly automated. The workpiece only needs to go through a few steps in the machine, such as cooling, vibration and cleaning, to complete the deburring operation. A large number of parts can be processed at one time, which greatly improves production efficiency and is particularly suitable for mass production.

Cost savings

Although the initial equipment investment for cryogenic deflashing may be high, in the long run, the cost of using this technology is low. Due to the high degree of process automation, no large amount of manual intervention is required, and the processing time is short and efficient, the unit processing cost of each workpiece is low.

Strong environmental protection

Cryogenic deflashing uses liquid nitrogen, which is a non-toxic, harmless and recyclable environmentally friendly material. Compared with some chemical deburring methods, it does not produce harmful exhaust gas, wastewater or other pollutants. It is not only environmentally friendly, but also complies with increasingly stringent environmental protection regulations.

Differences from traditional deburring processes

The main difference lies in temperature and treatment methods. Traditional processes usually rely on mechanical cutting, grinding, chemical treatment or high-temperature treatment, which work well for hard materials, but often have limitations when processing soft or complex structure materials.

Cryogenic deflashing hardens the burrs by cooling and then removes them in a gentle manner. In contrast, it does not produce significant thermal or mechanical stress, so it does not affect the intrinsic properties of the material. In addition, the cryogenic deflashing process is also suitable for processing parts with complex geometries, such as grooves, slits and other areas that are difficult to deburr mechanically. Another advantage is that the speed and accuracy of the cryogenic deflashing process are also superior to traditional mechanical or chemical deburring processes.

Traditional deburring process types

Mechanical deburring: burrs are removed by manual or automatic cutting, grinding or polishing tools. The advantages are simple operation and low equipment cost, but for parts with complex shapes, mechanical methods often cannot cover all areas. In addition, mechanical deburring may cause a certain degree of scratches or deformation on the surface of the workpiece.
Thermal deburring: burrs are melted or evaporated by high temperature (usually burning), which is suitable for some high temperature resistant materials. This method is suitable for processing large-area burrs, but the deburring range cannot be accurately controlled, and it may affect the mechanical properties of the material itself.
Electrochemical deburring (ECM): burrs are removed by electrolyte and electric current. Its advantage is that the depth of deburring can be precisely controlled, and it is suitable for processing high-hardness metal materials, but the equipment is expensive and the processing speed is slow.
Chemical deburring: burrs are corroded and removed using acidic or alkaline solutions. It is suitable for some small precision parts, but the corrosiveness of the solution may have an adverse effect on the main body of the material.

Comparison of applicability with other processes

Cryogenic deflashing has significant advantages over other deburring processes, especially in the processing of parts with high precision and complex geometries. The comparative analysis in the following table can help you understand their differences more intuitively.

Materials suitable for cryogenic deflashing

The uniqueness of cryogenic deflashing technology is that it can process materials that are difficult to deburr by traditional processes, especially in applications with high precision requirements. The following are several common materials used in cryogenic deflashing:

Rubber and elastomers

Rubber and elastomers are difficult to process using traditional mechanical deburring methods due to their soft and tough properties. These materials are usually used for automotive sealing strips, electronic equipment gaskets, soft parts in medical devices, etc.

Physical properties: Rubber and elastomer materials quickly become brittle at low temperatures, and burrs are easier to peel off without damaging the main structure.
Chemical properties: These materials will not undergo chemical changes in low temperature environments and can restore their original elasticity.
Scénarios d'application : The automotive industry, electronics industry, medical equipment manufacturing, etc. require high-precision parts, which are usually the main application areas of cryogenic deflashing processes.

Thermoplastics

Thermoplastics include ABS, polyethylene (PE), polypropylene (PP), etc., which are widely used in daily necessities, medical devices, electronic housings, automotive accessories and other fields. These materials are usually soft and easy to generate tiny burrs during the production process.

Physical properties: Thermoplastics can be quickly cooled in low temperature environments, and the burrs become brittle, so that the burrs can be removed without damaging the main structure.
Chemical properties: Low temperature treatment does not change the chemical properties of these materials, so the strength, chemical resistance, heat resistance and other properties of the materials are maintained.
Scénarios d'application : Cryogenic deflashing technology is widely used in plastic parts, such as electronic product housings, automotive interior parts, food packaging, etc.

Soft metals

Soft metals such as aluminum and magnesium are often used in aerospace, automobile manufacturing, precision instruments and other fields. Because these metals are sensitive to temperature and mechanical stress, traditional mechanical deburring methods can easily cause deformation or damage to the workpiece.

Physical properties: Soft metals do not become brittle at low temperatures, but the hardness of the burr part decreases, so it can be easily removed by mechanical vibration or air flow impact.
Chemical properties: Low temperature does not change the chemical properties of metals, so their basic properties such as corrosion resistance and strength remain unchanged.
Scénarios d'application : In high-demand metal processing industries such as aviation parts, automotive parts, and precision instruments, cryogenic deflashing processes are usually used to ensure high precision of workpieces.

Matériaux composites

Composites are widely used in industries such as aviation, automobiles, and sports equipment, especially in some parts with high strength and lightweight requirements.

Physical properties: Composite materials are mixed with different materials and have strong mechanical properties, but their complex structure makes burr removal difficult. The cryogenic deflashing process can effectively process these materials without affecting their structural strength.
Chemical properties: Low temperature will not affect the chemical stability of composite materials, ensuring their corrosion resistance and wear resistance in the use environment.
Scénarios d'application : High-precision and high-strength applications such as aerospace, automobile manufacturing, and sports equipment are ideal areas for cryogenic deflashing.

Future trends in cryogenic deflashing

Continuous technological innovation

Cooling technology optimization

Develop more efficient cooling media and cooling systems to further improve cooling speed and uniformity and reduce energy consumption. For example, research new liquid nitrogen injection technology or cryogenic gas mixing technology to achieve more precise temperature control and faster cooling effect.
Explore the application of other cryogenic cooling sources, such as liquid carbon dioxide or cryogenic nitrogen, to meet the needs of different materials and processes.

Improvement of deburring methods

Combine advanced mechanical vibration technology, ultrasonic technology or laser technology to improve the efficiency and accuracy of deburring. For example, use ultrasonic vibration combined with cryogenic cooling to enhance the embrittlement and shedding effect of burrs; or use laser-assisted deburring to accurately remove burrs in specific parts.
Develop intelligent deburring equipment that can automatically adjust process parameters according to the material, shape and size of the workpiece to achieve personalized deburring solutions.

Application field expansion

Emerging industry applications

With the rapid development of emerging industries such as new energy vehicles, aerospace, and electronic information, the demand for high-precision and high-quality parts is increasing. Cryogenic deflashing technology will be more widely used in these fields, such as new energy vehicle battery components, aircraft engine blades, and electronic chip packaging.
In industries such as medical devices and optical instruments that have extremely high requirements for surface quality, cryogenic deflashing technology will also play an important role to ensure the safety and reliability of products.

Complex material processing

For more and more new composite materials, nanomaterials and functional materials, traditional deburring methods often cannot meet the requirements. Cryogenic deflashing technology will continue to expand its applicable material range, develop special deburring solutions for these complex materials, and improve the processing performance and use performance of materials.

Green and sustainable

Environmentally friendly cooling medium

Further research and promote the application of environmentally friendly cooling medium to reduce the impact on the environment. For example, develop biodegradable cryogenic coolants or use air circulation cooling technology to reduce dependence on traditional cooling media such as liquid nitrogen.
Strengthen the recycling and reuse of cooling media, improve resource utilization, and reduce production costs.

Energy saving and emission reduction

Optimize the energy consumption of cryogenic deflashing process, and achieve the goal of energy saving and emission reduction by improving equipment design and improving energy conversion efficiency. For example, use efficient insulation materials to reduce heat loss, or use waste heat recovery technology to reuse the heat generated during the deburring process.

Industry collaborative development

Upstream and downstream industry chain integration

The cryogenic deflashing process will be closely integrated with upstream and downstream industries such as material research and development, equipment manufacturing, and parts processing to form a collaborative development industry chain. Through joint research and development and technological innovation, the competitiveness and added value of the entire industry will be improved.
Strengthen cooperation with relevant industry associations, scientific research institutions and enterprises to promote the standardization and standardization of cryogenic deflashing process and promote the healthy and orderly development of the industry.

Intelligent manufacturing integration

With the continuous development of intelligent manufacturing technology, the cryogenic deflashing process will be deeply integrated with automation, digitalization, and intelligent technology. It realizes functions such as fully automated control of the production process, real-time data monitoring and analysis, and remote fault diagnosis, and improves production efficiency and quality stability.
Use big data and artificial intelligence technology to optimize and predict the deburring process, discover potential problems in advance and take corresponding measures to reduce production costs and risks.

In the future, with the advancement of science and technology and the growth of demand in the manufacturing industry, cryogenic deflashing technology is expected to play a more important role in more fields. It not only improves the quality of the product, but also further improves production efficiency while ensuring environmental protection. The development of this technology will undoubtedly help the manufacturing industry move towards a new era of greater precision and efficiency.