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The use of the device for vibration drilling is described.
It includes a tailstock body, a sliding sleeve, a tailstock screw and a hydraulic vibration device.
The hydraulic vibration device is composed of a hydraulic station, a reversing valve, a cylinder, a follower piston and a speed regulating motor. The cylinder is bolted to the rear of the tailstock body. One end of the follower piston rod is connected to the tailstock screw, and the other end can be equipped with a handle to retain the function of the general lathe tailstock.
During operation, the high-pressure oil outputted by the hydraulic station enters the reversing valve through the oil pipe, and the reversing valve core is rotated by the speed regulating motor, thereby changing the flow direction of the oil path. The oil coming out of the reversing valve enters the cylinder through the pipe joint and pushes the follower piston to reciprocate. Adjusting the speed of the reversing valve can adjust the vibration frequency, adjust the flow of the throttle valve and the relief valve, and adjust the vibration amplitude.
The frequency can be adjusted in the range of 10200 Hz, and the amplitude can be adjusted within the range of 00050 5 mm.
1. Test and result of the plunger hole in the hole, the diameter of the hole is 54mm, the workpiece material is 20CrMo steel, the workpiece is clamped on the special chuck of the lathe spindle, and the main body moves with the spindle rotation, the speed is w=545r/min. Installed on the tailstock, rotate the tailstock handle to achieve axial feed, feed s dynamic drilling effect: hole tolerance is 5mm, the straightness of the hole is 0. The surface is smooth without damage, the pass rate is high, the drill bit is used long life. In the case of ordinary drilling, the surface of the hole is scratched by the chip, and some scratches are deep, so that the subsequent process cannot be performed, and the workpiece is scrapped.
Structural characteristics of the hydraulic vibration tailstock device of the lathe One of the characteristics of the hydraulic vibration device used in the device is that the reversing valve adopts a rotary valve, and the oil passage is changed during the rotation, so that the inlet and outlet ports are alternately replaced, so that the quick reversal can be smoothly realized. It avoids the existence of H inertia in the commutation of the general electromagnetic spool valve and hinders the rapid commutation. Therefore, the vibration frequency can reach 10200 Hz. If the general electromagnetic spool valve is used for commutation, the commutation inertia cannot exist. To achieve high speed commutation, the vibration frequency cannot be too high.
The second characteristic is that the follower piston rod is directly connected with the screw rod, and the vibration of the piston rod directly acts on the cutter to avoid the defects such as looseness, heat generation and amplitude fluctuation of the joint portion, and the axial vibration drilling of the drill bit is reliably realized. .
The vibration displacement during drilling is reduced by vibrating drilling with a twist drill. The drill bit is equivalent to two reverse-mounted turning tools, which can significantly reduce the vibration displacement during drilling, which is beneficial to the improvement of drilling quality.
Conducive to the vibration frequency, amplitude and workpiece rotation speed and feed rate when drilling and chipping vibration, it can control the size and shape of the chip, form fine chips, and reduce the chip and the tool and hole wall. Friction, to avoid chip clogging, so (turn to the next page) new æšç¨”å®šè¿°å™ ç¢‰I reduction 趑 heavy hanging ç–š * Nanchang Institute of Aeronautics and Astronautics (330034) Xu Zhifeng Cai Changchun Yu Huan Yan Qing Song Wan Hong Ningbo University (315211) Liu Xincai The new device is characterized by high efficiency, energy saving, environmental protection, simple structure, safety and reliability. It overcomes many shortcomings of the currently used lifting electromagnetic cranes. The suction force of the permanent magnet lifting crane working surface reached 237.9N/cm2; it fully meets the needs of practical engineering applications. By formulating and perfecting unified technical standards as soon as possible, a series of multi-variable permanent magnet lifting cranes will be formed, which is expected to become a new generation of lifting electromagnets.
At present, lifting hoists for ferromagnetic articles in metallurgy, machinery manufacturing and shipbuilding industries generally use lifting electromagnetic hoists. Because of their large power consumption, large self-heavy, poor safety and heat generation.
The shortcomings of short failure, long maintenance and other workloads have led to the development of various types of permanent magnet lifting cranes, while the high-performance rare earth permanent magnet material NdFeB is improving the performance of permanent magnet lifting cranes, achieving high reliability and miniaturization. It has shown good application prospects in terms of reducing costs and extending service life, and has greatly promoted the development of new permanent magnet devices. To this end, we have carried out research and development of high-stability NdFeB permanent magnet lifting cranes, in order to become a new generation of lifting electromagnetic cranes.
Working Principles of Electromagnetic Cranes and Permanent Magnet Cranes When electromagnetic cranes and permanent magnet cranes are lifted, they generate a strong magnetic field at the working pole surface. At this time, the magnetic lines pass through the suspended ferromagnetic workpiece.
The ferromagnetic workpiece is a component of the main magnetic circuit; when unloading, there is no magnetic field at the working pole surface. At this time, no magnetic field line passes through the sucked steel workpiece, and it can be completely unloaded. The difference is that the electromagnetic hoist is generated by the energization of the excitation coil, and the electromagnetic attraction generated depends on the number of ampere-turning coils. When the electromagnet is working, it is always energized. Therefore, the cable is required to be operated and the power consumption is large. It is prone to heat during work, and there is hysteresis and poor work safety. Therefore, the electromagnetic crane needs to be equipped with water-cooling equipment, anti-power-off equipment, delay device and cable-reeling and other ancillary equipment, resulting in large equipment, heavy weight, complicated technology, many faults, large maintenance workload and long service life. short.
The permanent magnet crane developed by using Qinling boron permanent magnet material can overcome these shortcomings and make a major change in the permanent magnet crane technology. The permanent magnet crane is designed by the principle of continuity of magnetic flux and the superposition principle of magnetic field. The magnetic circuit of permanent magnet crane is designed into multiple magnetic systems, and the magnetic field strength on the working magnetic pole surface is added by the relative motion of the magnetic system. Destruction, so as to achieve the purpose of work and unloading.
(a) Load state (b) Unloading state Permanent magnet lifting crane working principle diagram The working principle is as shown in the figure. When the lifting magnetic pole is in the state of the figure la, the magnetic field lines emerge from the N pole of the magnet, pass the yoke, pass the iron The magnetic workpiece is returned to the S pole of the yoke into the magnet. In this way, the workpiece can be firmly sucked on the working pole surface of the lifting crane. When the magnetic pole is in the state of Figure lb, the magnetic force line is less than the lifting weight. The surface quality of the hole processed by the working pole face (continued from the previous page) is significantly improved.
Conclusion From the above vibration drilling test results and vibration drilling mechanism analysis, the hydraulic vibration tailstock device of the lathe is simple in structure and reliable in operation. It can be installed not only on the lathe tailstock but also on the bench drill due to its vibration power. Large, can also be applied to vibration pull hole and vibration extrusion process, which is conducive to the promotion and application of vibration processing technology.
(Finish)
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