Electric, pneumatic automatic feed drilling head of development – drilling head, combination machine tool – metal industry
Abstract: This article describes the electric, pneumatic automatic feed drilling head of the working principle and basic structure and details of the first movement and the dynamic analysis and design calculations.
Keywords: Drilling head works design and calculation
Development of electrical-pneumatic automatic feed drilling head
Abstract : In this paper, the working principles and basic structure of theelectrical & pneumatic automatic feed drilling head areintroduced, motional analysis and design calculation on drillinghead are made in detail.
Keywords : Drilling head; Working principle; Design calculation
1 Overview With the rapid development of science and technology and scale of chemical production needs, using specialized equipment combined into a modern and efficient high-speed assembly line and multifunction Machine Tool In many industries has become a product of the process to ensure accuracy, reduce production costs, increase productivity and competitiveness of enterprises one of the key measures. Power head is an important driving force of combined machine tool parts, its quality and performance will directly affect the entire machine tool performance is good or bad, but in general the combination of machine tool design, the power head can only provide the primary campaign, the feed motion is matched by the associated hydraulic or mechanical slide to achieve, and this combination of tools to design and manufacture has become more difficult. To this end, the author in the digestion and absorption of foreign advanced technology based on the research design of a new electric, pneumatic automatic feed drilling head shown in Figure 1. Pneumatic control and hydraulic damping system shown in Figure 2.
1. Hydraulic governor 2. Synchronous Pulley 3. Bearing 4. Ring
5. Splined shaft 6. Ring 7. Bearing 8. Drilling Chuck
9. Piston rod 10. Spindle 11. Cylinder 12. Bearings
13. Bracket 14. Motor 15. Belt 16. Back cover
Figure 1 Figure 2 2 electric, pneumatic automatic feed power head of the main structural characteristics
Electric, pneumatic automatic feed drilling head from the main movement, the feed movement and control system composed of three parts.
(1) the main movement Electric, pneumatic automatic feed drilling head of the main campaign with three-phase induction motor drive, by the timing belt and the spline shaft of the motor's torque transfer to the spindle, spindle speed can be different to replace the different synchronization toothed pulley to achieve. As the power head of the main movement by motor drive, spindle speed characteristics of a good, output power and torque, can be adapted to large aperture multi-axis drilling and processing conditions.
(2) feed motion As the pressure transmission
fast response with action, environmental adaptability, simple structure, small volume etc., and can realize stepless speed regulation, long working life, convenient source of power source, so power to the movement into the head using compressed air as a power source. Taking into account the compressibility of air, load changes, power head smooth movement of poor, working into the speed of adjustment and control of the hydraulic governor to implement, dynamic head of the fast-forward and rewind speed of the exhaust throttle respectively valve to adjust.
(3) control system Electric, pneumatic automatic feed drilling head feed motion using compressed air as power source, the feed motion control is also used pneumatic control system, by a two five-ventilation valve, a motorized valve , two manual valves, a number of external control throttle and two component gas supply port, compact structure, with manual and remote control operation function and in situ, the former signal and reset signal protection. Power head fast way to process and work to block iron by continuously adjustable.
(4) characteristics of mechanical structure Electric, pneumatic automatic feed drilling head is a set of dynamic head of the main movement, the feed movement and control device in one of the drilling head, in order to achieve its compact form factor, the power head is embedded in the cylinder axis structure, spindle concentric with the piston rod, piston rod is hollow. Which is equipped with imported bearing, in order to improve the accuracy of the rotary spindle, spindle bearings mounted by the belt through the splined connection with the motor, cylinder fixed to the bracket, the piston rod is equipped with a hydraulic speed and stroke adjustment Screw By adjusting the screw collision limit switch, reset for power head spindle.
3 parameter calculation Electric, pneumatic automatic feed drilling head design parameters of the main provisions of the workpiece by the maximum aperture to determine the drilling parameters. Therefore, electric, pneumatic automatic feed drilling head of parameters, which must be calculated starting from the drilling process parameters.
(1) Drilling Force formula (1) Where: F?? Drilling process required drilling force, N;
C F ?? Material factor; D O ?? Workpiece machining diameter, mm;
X F ?? Equal to 1; Y F ?? Equal to 0.7;
F?? Feed, mm / r; K F ?? Workpiece hardness factor. (2) drilling torque formula (2) Where: M?? Required during the drilling torque, Nm;
C M ?? Material factor; D O ?? Workpiece machining diameter, mm;
X M ?? Equal to 1.9;
Y M ?? Equal to 0.8;
F?? Feed, mm / r; K M ?? Workpiece hardness factor. (3) drilling power formula P M = 2 Mn.10 -3 (3)
Where: P M ?? Drilling process the required power;
N?? Drill Speed, r / s. (4) propulsion power head formula F = (D 2 -D 2 ) P / 4 (4)
Where: F?? Power head of the driving force, N;
D?? Piston diameter, mm; D?? Piston rod diameter, mm; P?? Gas pressure, MPa; ?? Efficiency coefficient (0.85) (5) Air consumption formula Q = S (2D 2 -D 2 ) v . 10 -9 / (4t) (5)
Where:
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