GUANGZHOU HAOZHI INDUSTRIAL CO., LTD.

Definitionof zirconia

Zirconium oxide (chemical formula: ZrO2)is the main oxide of zirconium. Under normal conditions, it is white, odorless andtasteless crystal and is hardly soluble in water, hydrochloric acid and dilutesulfuric acid. Usually containing a small amount of hafnium oxide, it ischemically inert and is characterized with high melting point, high electricalresistivity, high refractive index and low thermal expansion coefficient,making it an important high temperature resistant material, ceramic insultingmaterial and ceramic sunscreen. It is also the main raw material of artificialdrilling. Its bandgap is about 5-7eV.

Since invented by Garvei, a scientist of Australia in 1970s, it hasowned the flexural strength greater than 1,500MPa and the fracture toughness upto 15MPa.m1/2, so it will not be broken when it falls from a 2m high position.

Ceramicfeatures

Products that are made of ceramic materials are characterized with highhardness, wearing and scratching resistance, exquisite appearance and jade-likehand feeling. Additionally with its advantages in signal transmission, it isvery popular in 3C industry. It has been widely used for mobile phones, smartwearable devices and other products.

Compared with ordinary aluminum alloy, stainless steel and othermaterials, engineering ceramics has extremely high hardness and wearingresistance as well as great brittleness, so it is hard to be machined.

Due to the high hardness of ceramics, the cutting force of grindingwheel abrasive is great during grinding. Ceramic powder’s easy gluing to agrinding wheel results in the continuous increase of the cutting force so thatthe grinding wheel is worn rapidly. Therefore, the cutter cost has been alwayshigh.

When the surface of the ceramic casing is finished, the grinding wheelis worn rapidly, resulting in the poor accuracy of dimensions, inconsistentsurface smoothness and low product yield.

If the temperature rise is too high during machining, the materialstructure of ceramics will undergo irreversible changes. Therefore, it needs tocooldown the ceramic workpiece quickly during machining in order toavoid defects on machining surface caused by temperature change.

Fine ceramic powder can easily invade the spindle and machineaccessories, affecting the life of the spindle and related machine components.

Ultrasonicgrinding

During machining, the cutter forces the abrasives to impact the surfaceof workpiece through vibration at an ultrasonic frequency (21K~24K) whilerotating, generating hammering action and reducing the cutting force. At thesame time, the ultrasonic cavitation effect can strongly remove the ceramicpowder from the cutter and machined surfaces, ensuring the stability thecutting force during the cutting process and preventing the cutter from defectssuch as sticking debris, burning, crushing damage, etc. Therefore, it caneffectively improve the quality of machined surfaces, obtain the mirror-levelmachining effect with a roughness less than Ra0.1 and greatly improve theservice life of the cutter and the machining efficiency.

Centralwater-flowing cooling

With the unique patent design of central water-flowing for the ultrahigh-speed spindles, the cooling fluid can be sprayed from the inner hole onthe front end of the cutter to cool the cutter through the central hole of thespindle center, so that the cutter can be fully cooled and ceramic powder andresidual abrasive on the cutter can be completely removed while the spindle isgrinding the ceramics at a high-speed. In addition, when water comes from thespindle center, it can effectively solve the shortcomings that machining areascannot be cooled by coolant while machining deep holes or small holes. It canfully cool the cutter from the inside to the outside and thus improve theservice life of the cutter. At the same time, it can effectively cool thespindle center so as to improve the motor efficiency, reduce the thermalexpansion of the spindle center and increase the machining accuracy.

Ultrahigh-speed spindle machining

The motorized spindle with the oil-gas lubrication structure can achievethe grinding and machining of ceramic materials at a speed up to 75,000rpm orhigher. The linear speed of the cutter is greatly improved and the grindingforce is greatly reduced. In addition, when grinding ceramics at an ultrahigh-speed, the ceramic powder can be quickly separated from the cutter andmachined surface due to the high-speed centrifugal force. Simultaneously, itcan quickly remove the heat from the machining area. In addition, the coolingeffect of central water-flowing greatly prolongs the service life of thecutter; and the machining quality and machining efficiency are also greatlyimproved.

High-speedpermanent magnet synchronous motor

By use of the permanent magnet synchronous motor, the motor power isimproved by 25%; the start and stop time of the spindle is short; the torque isbig; the motor efficiency is high; therefore, the machining efficiency of thespindle is greatly improved.

Shaft-endtriple seal

Integrating three seals, namely dynamic pressure seal, labyrinth sealand air curtain seal at the front end, the spindle can effectively prevent fineceramic powder from invading the spindle, avoid the spindle damage and greatlyimprove the grinding reliability of the spindle.

Solution

A variety of industry-leading ceramic machining technologies

A variety of ceramic machining solutions

After-sales technical services with quick response

Lowcost solution

The spindle is the built-in motorized spindle that is specially used forthe ceramic machining industry. With a built-in three-phase AC asynchronousinduction motor, it can perfectly match with the systems of Mitsubishi, Fanuc,Siemens, etc. Designed with a variety of independent patents, the spindle ischaracterized with a compact structure, light weight, small inertia, fast startand stop, small vibration and low noise. It can achieve high-precision, stableand efficient machining.

A solutionof high-speed permanent magnet synchronous motor with central water-flowing

The ultra high speed, together with central water-flowing jet, caneffectively remove ceramic powder and abrasive chips from the grinding wheeland machined surfaces, lower the temperature of grinding area, improve theservice life of cutter and ensure the machining quality.

With the optimized design of structure, the spindle has an ultra lowvibration and ultra high precision at an ultra high-speed, so that themachining quality is further improved.

The built-in efficient permanent magnet motor can present big power, bigtorque and high efficiency.

Solutionof most advanced ultrasonic motorized spindle

Ultra high-speed plus ultrasonic vibration can greatly reduce thecutting force of the cutter, effectively remove ceramic powder and abrasivefrom the cutter and the workpiece, improve the service life of the cutter andensure the best machining quality.

The ultrasonic transducer is integrated inside the spindle, which can beused only with an ordinary shank, without affecting the automatic cutter changeof the tool magazine. Therefore, it is both economic and practical.