NEWS
Preparation and Application of Electroplated Diamond Tool
Author: yisainuo Time: 2017-05-27 18:18:42
With the economic development, scientific and technological progress, different industries on the requirements of electroplated diamond tools are basically the same, that is, high efficiency, long life, high grinding accuracy. To ensure these characteristics, the coating metal not only have a higher hardness, wear resistance, but also in the various parts of the matrix to be evenly distributed, so that the coating off the tool life shortened.
Electroplated diamond tools: refers to the metal electrodeposition method, the diamond firmly by the carcass metal wrapped in the matrix (steel or other materials) made of a diamond tool, it is widely used in mechanical electronics, glass, building materials, Oil drilling and other industries.
Electroplated diamond grinding head
Applications: For machining of crankshaft, main bearing, connecting rod bearing, piston rod, piston ring groove, valve head and stem, gear, rack, thread and journal, electroplating diamond reamer for light industry and hydraulic Parts reaming, electroplated diamond grinding wheel with high processing accuracy and high service life, in addition to grinding nail with a file, sharpening the use of electroplating stone, dentists with electroplated diamond diamonds and so on.
1. Machining industry
Electroplated diamond roller has been successfully applied to dressing grinding with ordinary grinding wheel or directly on the workpiece molding grinding, and widely used in processing crankshaft, bearings, hydraulic valves and so on.
Electroplated diamond hand-made file or machine file, and a variety of shapes of diamond grinding head, widely used in processing grinding, carbide or quenching hard steel made of steel mold, or a variety of shapes of the workpiece surface and the hole.
Electroplated diamond reamers have become a tool for hydraulic equipment and sewing machine parts. It has the advantages of high precision, high efficiency and durability.
2. electrical and electronic industry
Electroplated diamond inner and outer cutting blades for cutting the finest materials such as semiconductors. With high efficiency, narrow slits, less material loss and so on.
Electrical and electric equipment commonly used in graphite and carbon fine materials, with a hard and brittle nature, can make electroplated diamond grinding roller planing large graphite blocks;
Can be used electroplating saw blade cutting; available grinding wheel grinding grinding.
3. Glass industry
Electroplated diamond digging knife can be directly on the optical glass plate to extract a variety of optical instrument lens round billet.
Electroplated diamond grinding wheel, reamer, drill Tsui, etc., can be in ordinary flat glass on the edging, drilling, reaming.
4. Arts and Crafts and Commodity Industry
Electroplating diamond grinding head, etc., can be a variety of precious stones, jasper, ceramics and other industrial art carving and grinding flowers.
Electroplated diamond nail file as a complete set of modification tools, designed for people to wear nails.
Electroplated diamond grinding wheel for rubber sole trim.
Basic process:
Diamond selection:
basic requirements:
I. Appearance features: pure diamond should be colorless and transparent (in fact, often contains impurities and defects and color). Artificial diamond under the metallographic microscope was observed octahedral, diamond dodecahedron, cube and its aggregates. Often yellowish green, more impurities were gray-green, boron-containing diamond was black.
II. Performance: According to JB2808-79 standard, diamond is divided into JR1, JR2, JR, JR44 models. The higher the label, the higher the hardness, the better the quality, the more expensive, but not the better performance. Although JR4 diamond hardness is the highest, but not as sharp as JR3 diamond, if the two mixed use, both to maintain good performance, but also reduce production costs.
Diamond exclusion:
Magnetic impurity: Synthetic diamond contains magnetic inclusions (catalyst metal), generally have a magnetic, the higher the content of inclusions, the stronger the magnetic. Magnetic strong diamond, not only impurities, low strength, poor heat resistance, and will have a negative impact on the quality of plating, easy to form a nickel tumor, it is not easy to use. The reason for the magnetic inclusions of good conductor, so that the diamond particles of poor insulation, there has been a weak conductivity. In the power line clamp effect under the effect of metal nickel is preferentially plated on the diamond layer formed on the coating more than the formation of nickel tumor. In order to avoid the impact of magnetic impurities, the use of magnetic graphite before the election, preferably in a dedicated magnetic separator, you can also use the magnet to remove magnetic particles strong. Once the diamond is found strong magnetic, the diamond should be all returned.
Adsorption of impurities: diamond is not pure, the surface of a total of a layer of adsorption impurities, if not removed in advance, diamond particles will float on the surface of the electrolyte, can not be deposited on the substrate up. Therefore, the use of diamond must be hydrophilic (wet) treatment, hydrophilic method can refer to the information.
The basic principle of metal plating: plating bath, will be immersed in the plating solution and the DC power supply connected to the negative (the composition of the cathode), the metal to be plated and DC power supply connected to the positive (composed of anode), plating tank In the plating solution containing metal ions in the plating, connected to the power supply after the metal ions in the plating solution will be deposited in the cathode.
Electrodeposition diagram
Electroplated diamond principle: Diamond in weak acid solution adsorption H + (which can be added after adding diamond solution pH increased proof), and under the action of the electric field to the cathode slowly moving, and finally adsorbed on the cathode surface. In this way, when Ni2 +, Co2 +, Mn2 + continue to adsorb on the cathode surface, the diamond adsorbed on the surface of the cathode is wrapped up to form a diamond composite coating.
Electrolyte heating: Since the heating temperature of the electrolyte is not very high (<50 °), it is usually heated in a water bath and the plating vessel is placed in the water bath of the operation table. Heating can be used titanium heating pipe or water heater, the former placed in the water bath, the latter hot water pipe into the water bath. The heating tube can be equipped with a temperature control device. The principle of the electronic relay (DJ-702 type) to control the main part of the electric heating the main circuit, that is, contactor JC, so close (or disconnect), thus connected (or cut off) heating power to achieve automatic temperature control purpose.
Recovery of the plating solution: the end of the plating, the workpiece out of the slot, the application of distilled water in the plating tank above the surface of the workpiece, so that the workpiece out of the electrolyte and entrained diamond flow back to the tank for recycling.
Electroplating clean production of the basic conditions: At present, electroplating diamond tool manufacturers most of the plant is relatively simple, poor production conditions, do not attach importance to environmental protection, resulting in environmental pollution, affecting product quality. To achieve clean production, improve product quality, must be integrated management.
Select the electroplating workshop address, pay full attention to the impact of the electroplating workshop on the surrounding environment. Electroplating workshop should be located in fresh air and good convection, to ensure that the workshop natural ventilation and good lighting. But also to prevent the surrounding environment on the workshop pollution, to prevent the outdoor dust blowing into the workshop, fell into the plating tank.
Comprehensive management:
① overall exhaust: In order to keep the workshop well ventilated, should be the overall mechanical ventilation as an auxiliary means, the use of exhaust fan from the upper part of the indoor exhaust, the air volume should be sent by the air supply system to compensate for fresh air.
② local exhaust: In order to control the spread of harmful gases, to prevent pollution of indoor air, in the production of harmful parts of the site to have local exhaust facilities. Outdoor exhaust should be higher than the roof of the roof 115 ~ 2m.
③ closed exhaust: degreased workpiece and pickled diamond will produce thick yellow smoke, pollution, harmful to the human body. Must be carried out in the fume hood, to achieve strong closed exhaust.
Strict hygiene
① operator into the electroplating workshop to wear uniforms, for work shoes, prohibit non-staff casually into the workshop.
② daily work is completed, carefully clean up the operating site; regularly clean up the workshop equipment and electroplating containers, auxiliary equipment, remove dust and salt crystals, keep the equipment clean and normal operation (special conductive parts).
③ When the plating equipment is disabled, cover it with cover (especially the plating tank and sand holding container) and keep it clean.
④ workshop to prohibit the accumulation of non-production debris, reduce the source of dust.