Although in the automotive industry, this type of grinding burn test instrument based on the BN method can be used in many occasions, in contrast, the detection of the cams in the camshaft of the engine is the most used. This aspect is due to the fact that the cam is a load-bearing part and the working condition is poor; on the other hand, the different curvature radius of the circumferential direction of the cam may cause a difference in the surface state during the grinding process, in which case the grinding burn occurs. The probability will increase.
Figure 3 is a schematic diagram of the instrument, which is a high-efficiency semi-automatic testing device, which is very suitable for use in automobile engine and internal combustion engine factories under mass production conditions. First of all, for different camshafts, a precisely machined axial positioner is required, which has a row of notches in the longitudinal direction, and each notch corresponds to a detected cam. Before starting the measurement, you must carefully adjust its position on the body. When the sensor arm is inserted into any gap, the probe is just aligned with the corresponding cam. At this time, the screw with the knob can be used to fix the axial positioner. Fixed to the body. After the operator starts the device, the workpiece to be tested starts to rotate under the driving tip. At this time, the operator simply lifts the handle on the sensor arm to move the sensor along a cylindrical guide rail on the body. When the first cam is inspected, gently put it into the handle. While the handle is embedded in the notch of the positioner, the probe is pressed against the surface of the cam under the action of the force spring, and dynamic detection is performed as the workpiece rotates. During this period, the continuously output BN signal is presented as a curve on the control panel display on the device side. After completing the one-week test, the operator lifts the handle on the sensor arm again, causing the probe to disengage from the first detected cam and move to the next measurement, until all the cams are measured and return to the starting point.
1. Body 2. Sensor and arm 3. Drive tip 4. Dead tip (tail frame) 5. Axial positioner 6. Tailstock handle
7. Axial positioner fixing knob 8. Guide pin 9. Limit screw 10. Stop block Figure 3 BN grinding grinding test instrument schematic
Although it is only a semi-automatic device, it is easy to operate and highly efficient. Checking a workpiece, such as the camshaft of a four-cylinder engine, includes loading and unloading for less than 2 minutes.
At present, such new type of grinding burn detection instruments based on the principle of magnetic bomb method have been commercialized and successfully applied in many industries. For the characteristics of different workpieces to be tested and the needs of individual users, these new types of testing instruments can be designed and manufactured into different types, with static methods of point-by-point measurement, and continuous dynamic measurement methods as described above. The depth that the instrument can detect depends on the conductivity of the material being inspected, the permeability, and the determined excitation frequency. The instrument is equipped with two excitation frequencies, 3-15kHz and 70~200kHz. The depth of inspection of such new instruments developed according to the principle of magnetic bombing is generally in the range of 0.01 to 1.5 mm, but usually the depth of the surface grinding of the workpiece is 0.02 to 0.2 mm.
Although the domestic market has just started, the occasions that have been adopted include the camshafts in the automotive engine industry and the ferrules in the bearing industry, which show quite broad prospects.
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