Winding Glass Fiber Cylinder,High Temperature Resistance Fiber Cylinder,High Standard Scuba Diving Cylinder Gas,Glass Fiber Winding Cylinder Jiangsu Minnuo Group Co., Ltd , https://www.minnuocylinder.com
1. Spindle motor 2. Mast lever 3. Compression cylinder 4. Mast lever 5. Pin hole positioning lever 6. Pin hole positioning cylinder 7. Longitudinal servo motor 8. Bed body 9. Support rod 10. Vibration reduction pad 11. Back Spindle 12. Front Spindle Figure 1 Polycrystalline diamond tool machining aluminum alloy cutting parameter recommendation table Tool supply factory cutting speed
v(m/min) feed rate
f(mm/r) Depth of cut
Ap (mm) Japan Sumitomo ~ 3000 ~ 0.2 ~ 3 Japan Toshiba 1000 ~ 2500 ~ 0.2 0.05 ~ 1.0 Japan's Mitsubishi - 3000 ~ 0.2 ~ 1 1 double axis fine boring machine design mechanical part design (Figure 1) diamond tool suitable for use Processes non-ferrous metals and their alloys at high speeds. We use polycrystalline diamond cutting tools for the fine boring and pin drilling process. The cutting parameters of the aluminum alloy processed by polycrystalline diamond tools recommended by some tool suppliers are shown in the right table. The pin holes of the pistons of motorcycles and minicars are small. Take Ø16mm diameter pin holes as an example. When the spindle speed is 2000r/min, the cutting speed is only v=npd=100.48m/min. This cutting speed is recommended by the above table. The contrast is obviously low. During machining, the roughness of the machined surface is mainly determined by the geometry of the residual area and the instability of the cutting process. When using polycrystalline diamond tools to process aluminum alloy, no built-up edge is generated. Due to the increase of cutting speed, the instabilities in the cutting process that affect roughness are mainly the increase of cutting force and the vibration of the boring bar. Within a certain range of speed, through the use of cemented carbide boring bars, to improve the rigidity of the boring bar: strictly control the quality of the boring bar, reduce the imbalance of the boring bar and adjust the tool angle, these negative factors can be affected Reduced to very small. RaâˆH≈ f2 8r Where: H - cutting residual area height, mm f - feedrate, mm/rr - radius of the tool tip arc, mm According to the above formula, in maintaining the feed rate, cutting depth, Under the premise that the radius of the tip radius does not change, increasing the cutting speed will not make the roughness worse. On the contrary, due to the increase of the cutting speed, the best cutting speed is achieved, and at the same time, the feed speed f is properly adjusted, which in turn reduces the surface roughness. (When the spindle rotates at a low speed, the feed rate is too low and it may cause crawling of the guide rail.) Increasing the cutting speed is one of the effective means to increase the machining efficiency. In order to guarantee the performance of the machine tool, we have imported precision spindles with speeds up to 8000r/min. Using two spindles to process two pistons at the same time, the machining efficiency is doubled. Cancel the original manual compression device, use the cylinder compaction, reduce the auxiliary time, reduce the impact of human factors, so that the pressing force is consistent to improve the consistency of the roundness of the pin hole. The original C616 lathe bed is tall and narrow, with great vibration. Redesigned wide body rigid bed, lower machine center of gravity, reduce machine vibration. Use plastic guide rails to reduce the friction of the slide guide pair. THK high-precision ball screw drive is used longitudinally to improve the smoothness of the movement. Automatic intermittent lubrication device ensures full lubrication of all parts. The electric part design spindle is driven by the variable frequency motor, and the frequency converter is steplessly speed-regulated, which makes the adjustment of cutting parameters more convenient and realizes the soft start of the spindle. The FANUC CNC system replaces the original simple CNC, improves control accuracy and reliability, and reduces downtime. Longitudinal servo motor drive is used instead of the original reactive stepper motor to make the movement more stable. 
1. Compact cylinder 1 2, 4, 6. Speed ​​control valve 3. Compression cylinder 2. Pin hole positioning cylinder 7, 8, 9. Electromagnetic valve 10. Check valve 11. Pressure gauge 12. Motor 13 Oil pump 14. Relief valve Fig. 2 Control the exact stop of the spindle to avoid scratching the machined surface when retracting. Hydraulic design (Figure 2) The hydraulic system is mainly used to control the expansion and contraction of the piston positioning rod and the workpiece pressing. In order to facilitate adjustment, two cylinders are used to compress two workpieces separately to achieve independent control. 2 After the production of self-made biaxial boring mills at production level, the main machining levels are as follows: Normal machining spindle speed is around 6000r/min (Adjustment by tooling, selecting proper tool and machining parameters, speed can be further improved): Hole roundness ≤1.5μm, busbar straightness ≤1.5μm: Stable performance, according to the process chart assessment Cp> 1.33: Surface roughness is significantly improved: Ra ≤ 0.4μm: Processing efficiency is significantly improved, a dual-axis boring machine can be replaced 3 Old hydraulic boring machine. The main performance index of the machine tool has reached the level of similar imported machine tools. 3 Economic effect The original production line needs to be equipped with 3 hydraulic boring machines. Now only 1 twin-axis boring machine is needed, and the rolling process can be eliminated at the same time. Each production line can reduce 3 operators. Product quality stability has been significantly improved, reducing the loss of processing waste. In the past two years, we successfully organized and produced more than 10 sets of twin-axis boring machines, which basically replaced the original hydraulic boring machine, resulting in a new level of product quality, saving more than RMB 10 million in capital and achieving a very good economy. And social benefits.
Design and Manufacture of Double Axis Fine Boring Machine
The processing requirements for piston pin holes of motorcycles and minicars are cylindricity ≤ 3μm and roughness Ra ≤ 0.4μm. Such a high demand requires high-precision processing equipment guarantees. At the end of the 8th century, custom-made specialized equipment in the country was expensive. Under the premise of low investment, our technical personnel developed a precision hydraulic spindle and used the C616 lathe bed to assemble a precision boring machine machine to basically solve the problem of pin hole machining for motorcycles and minicars. However, the following problems still exist. Insufficiency: (1) Self-made hydraulic hammer spindle speed ≤2000r/min, cutting speed is low, processing efficiency can not be improved. (2) The surface roughness of the machine is difficult to meet the requirements, and the pin hole must be rolled after finishing. (3) Hydraulic system maintenance workload is large. To further improve the above situation, our company organized a task force to tackle the problem.