Inspection of diamond circular saw blades for cutting concrete
The inspection items of diamond circular saw blades for cutting concrete include appearance, geometric dimensions, saw blade end runout and radial runout, substrate hardness and flatness, and diamond tip strength.
Appearance of saw blades for cutting concrete
The appearance quality of the diamond circular saw blade should be inspected visually or with a 10x magnifying glass, and the chipping should be inspected with a sample plate or a vernier caliper with an index value of 0.02mm.
Appearance requires that there should be no cracks on the surface of each tooth and no more than 2 chipping edges with a length and width of 1mm, and the sintered piece should not have a mute sound. The saw blade with an outer diameter of less than 600mm needs to be edged, and the diamond particles on the working surface should be exposed and evenly distributed. If the substrate is painted, the coating should be uniform, smooth, free of spots and scratches. The welding saw blade requires that the weld be full, there should be no cracks and holes, and the solder accumulation should not be higher than the end face of the sawtooth.
Circular saw blade geometry
The external dimension of the diamond circular saw blade for cutting concrete is detected with a vernier caliper with a division of 0.02mm, and the diameter of the saw blade is detected with a smooth hole plug gauge or an inner diameter micrometer. The base body of the saw blade and the external dimensions of the saw teeth are tested with a steel tape measure, a steel ruler and a vernier caliper, and the inner hole diameter is detected with a vernier caliper or an inner micrometer with a special plug gauge indexing value of 0.02mm. The end-face symmetry detection of the cutter teeth on the base body is detected with a special tool with a dial indicator.
Blade face and radial runout
The testing instrument required for the end face and radial runout of the diamond circular saw blade is a circular runout instrument. The radial runout of the mandrel shall not be greater than 0.01mm, and the runout tolerance of the flange end face shall not be greater than 1/10 of the end face runout tolerance value of the measured saw blade. The diameter of the flange shall not be greater than 1/3 of the diameter of the saw blade being tested. The diameter of the flange of the saw blade with an outer diameter of less than 400mm shall not exceed 1/2 of the diameter of the saw blade under test.
When detecting the end face of the saw blade and the radial runout, use the flange to fix the saw blade on the mandrel, place the dial indicator contacts on the outer diameter of the saw blade and the side of the base at 10mm from the bottom of the groove, rotate the saw blade slowly, and read The value on the dial indicator is the radial and end face circular runout value of the saw blade.
The hardness and flatness of the matrix of the diamond saw blade
The hardness of the substrate is tested with a Rockwell hardness tester. According to the different materials and processes, the hardness of the general welding saw blade substrate ranges from 33 to 45HRC. When testing, check any three points, and the hardness value is required to be between ±2 of the average value. The flatness of the substrate is checked with a 500:002 flat ruler and feeler gauge. The flatness of the saw blade with an outer diameter of less than 400mm is tested with a 50~300mm knife edge ruler and a feeler gauge.
Testing of bond strength of diamond circular saw blade for cutting concrete
The bonding strength of the diamond circular saw blade largely determines the use effect of the product. In the process of saw blade cutting concrete, due to the insufficient bonding strength between the saw blade and the substrate, the individual saw teeth are broken and thrown out, which will seriously threaten the safety of the operator and also affect the service life of the saw blade. Therefore, the detection and control of the bonding strength of diamond saw blades is very important.
Regarding the detection of the bonding strength of diamond circular saw blades, it is mentioned in GB/T112701-2002 and GB/T11270.2-2002. It is recommended to use the ZMC-A type diamond saw blade saw tooth bonding strength tester for testing in the standard, but for For manufacturing enterprises, the practicability of this testing instrument is poor. Generally, the main tool for testing the bonding strength of welding saw blades is a torque wrench, or testing equipment is used for testing, such as the domestic AWB4 automatic bonding strength testing machine and the German SPE bonding strength testing machine. Ultrasonic measurement method is a new type of measurement method for the welding quality of laser welding saw blades. . The main advantage of this measurement method is the non-destructive nature of the measurement.
The detection index of the bonding strength is generally expressed by the bending moment M, and can also be expressed by the bending strength. The former is mainly used in the actual production testing process, and the latter is mainly used in product development and design. And many large export-oriented enterprises, mainly based on EN13236:2001E “Superabrasive Abrasives Safety Requirements” to formulate the internal control guidelines of the enterprise. According to the EN standard, saw blade bonding strength testing is divided into destructive testing and non-destructive testing.