Other Hardware,Door Pull Handles,Glass Door Handles,Shower Door Pull Handle Foshan City, Nanhai District Huidexing Stainless Steel Products LTD., , https://www.huidexing.net
At present, the domestic and international high-quality stone and jade market is active in development, and the economic development prospects are very broad, thus stimulating and driving the rapid development of related processing industries. In terms of processing difficulty, jade is the most difficult to process. Generally, the Mohs hardness of precious stones such as turquoise is 3 to 4.5, and the Mohs hardness of jade in jade is 4.5 to 5.5, and the hardness of jadeite such as Burmese jade is 6.5 to 7. In layman's terms, the more precious the jade material, the more difficult it is to process. Because in addition to the high hardness, precious jade materials have strict requirements for fine cutting, beautiful cut surface and jade loss.
There are usually two types of technical approaches for the manufacture of cutting saw blades for hard and precious materials such as jade and gemstones:
1. Powder metallurgy hot pressing and welding process: the diamond particles are mixed with metal powder such as bronze, and then hot pressed into a cutting wear ring (or block), and then the wear ring is welded to the saw blade base. The saw blade used for cutting jade has the fatal weakness of cutting efficiency, large slit, and serious wear of jade.
2. Electroplated diamond saw blade: After the groove is formed on the outer edge of the saw blade base, the diamond is evenly sprinkled, and then the substrate is bonded to the diamond by electroplating. The saw blade produced by this method can cut all jade materials and work efficiently. However, the following disadvantages exist: 1 diamond particles adhere to the non-edge of the saw blade base during electroplating, so that the thickness of the saw blade is increased, the slit is widened, thereby increasing the loss of jade material; 2 due to the limitation of the plating bath, it is impossible to manufacture large Sized blades of size; 3 electroplating process has serious environmental pollution problems.
This paper briefly introduces the technical route of self-developed diamond jig saw blades for processing jade and gemstones.
Second, the technical route of the project
In this project, the selected artificial diamond particles are bonded into a piece of flakes by self-developed binder, placed in the edge of the saw blade base with precise design calculation, and the metal edge of the saw blade is made by scientific and reasonable calendering process. Appropriate plastic deformation, which plays a good role in fixing the diamond single crystal. This method of not using electroplating can make large diameter sheets and avoid environmental pollution caused by electroplating.
Third, the development of the introduction
1, abrasive selection
The dental saw blade developed by this project uses synthetic diamond as the cutting sharp body, and the particle size and concentration of the diamond abrasive should be selected according to the processing technology requirements. Due to the different sizes of saw blades for cutting jade, there are different requirements for the particle size and concentration of diamond. The saw blades produced by our company range in diameter from Φ200 to Φ1250, with a total of 13 bins. We pre-selected 3 particle sizes and 2 concentrations for each size for comparative test screening to determine 13 different sizes of product and diamond grain size.
2, substrate selection and processing
The saw blade base requires both a certain strength and a corresponding toughness and ductility. After the steel grade is selected, the mechanical calculation is performed according to the size of the saw blade, and the thickness is determined to meet the strength required for the application. Another function of the strength requirement is to ensure the cutting efficiency, while the plasticity and toughness provide the metal deformation degree of the saw blade in the pressing pressure delay to firmly support the diamond particle agglomerate to ensure the cutting.
After detailed calculations and tests, high-quality cold-rolled steel sheets imported from Japan were selected as the base material. Its chemical composition is: C<0.08%, Mn=0.30%-0.45%, Al=0.02%-0.07%, and the mechanical properties are “бb=260～350N/mm2, бS<240mm2, δ10≥39%â€. These performance guarantees that the substrate can meet the technical requirements for turning, constitutional and pressure delay.
3, binder trial production
After 10 to 15 types of test comparison, the YJ204 special binder was determined.
The binder enables the diamond particles to be flexibly bonded, both to ensure bond strength and to withstand the metal extrusion force of the calendering process. Viewed from the microscope, there is a semi-cured grease bond film between the bonded synthetic diamond agglomerates. When the pressure is not subjected to the rolling stress, the thickness of the adhesive film is large; after the calendering and extrusion, the area of ​​the adhesive film is enlarged, and the thickness is small, but the good particle bonding is always maintained.
4, calendering process
In order to facilitate the calendering operation, we have designed the corresponding molds suitable for various product sizes. The shape of the molds is well matched with the shaft holes and side grooves of the saw blades. With the guarantee of the mold, the calendering deformation of the base metal can be concentrated in the alveolar portion. The deformed alveolar is closely combined with the inner diamond-like piece of the diamond to form a convex spherical wave connection, and such a tooth shape is most advantageous for the sawing of the jadeite.
For the selection of calendering process parameters, we carried out hundreds of calendering tests on the basis of mechanical calculations, and accurately measured and recorded the deformation amounts under various pressure intensities. At present, the calendering mechanical parameters selected in the production process have a good correspondence with the diameter of the saw blade.
Fourth, the conclusion
Our new patented diamond dental saw blade successfully overcomes the shortcomings of the other two types of saw blades for cutting hard materials. Its characteristics are:
1. The products of this project can cut jade materials, especially jadeite such as jadeite (there are no problems in cutting other hard materials), with high cutting efficiency and good guiding.
2. The dental saw blade is not limited by the electroplating process. The saw blade is large and thin (the thickness of the saw blade with a diameter of 1250mm is only 2.5mm). The slit is thin and the cut surface is beautiful, which makes the loss of jade material small.
3. Avoid the environmental pollution caused by the electroplating process.
Development of Diamond Crushing Saw Blade for Gem Processing
I. Introduction