Nut Kernel Shell Seperator Machine
Nut Kernel Shell Seperator Machine:
Company Introdution: Nut Kernel Shell Machine,Shell Machine,Nut Kernel Separator Machine,Separator Machine Henan Gems Machinery Co.,Ltd , https://www.gemsmachine.com
The machining principle eliminates the formation of gear tooth error as shown. In the finishing process of tooth profile diamond electrochemical, area 1 and area 2 simultaneously cut the margin, and the height of area 1 and area 2 is:! =bsinb=2-1 where: b is the width of the machined toothed disc; 1, 2 area 1 and area 2 electrode gap values; formed tooth error.
The amount of metal removed from area 1 is a composite method, that is, a micro-grinding and electrolysis method; and the amount of metal removed from area 2 is substantially by electrolysis. Therefore, when a fatigue layer having a high ohmic resistance is formed on the area 2, the process of anodic dissolution and the detachment of metal may be stopped [2].
The speed at which the metal is removed by micro-grinding is: v1 = (S / a2) vk (1) where: the amount of diamond particles effectively cut; the area of ​​the S-grinding cut; the spacing of a particle; the slip of the vk tool speed.
The rate at which the metal is removed electrochemically is: 2 = c(U-Un)/2 where: c electrochemical equivalent; the anode output of the current;
The margin removed in the N pairs of rolling cycles is: ZN = y2N - y1N = t). N-, Z1k (3) analytical formula (1) formula (3) shows that the effect of the diamond electrochemical finishing process of the tooth is basically the speed v1 and the speed v1 of removing the metal amount from the area 1 and the area 2 The ratio of v2 is determined. In order to achieve high machining accuracy, v1/v2 should be the largest [4].
Experimental Results The test apparatus was used to verify the accuracy of the machining method of the toothed diamond electrochemical as shown.
1. processed gear; 2. cam; 3. tachogenerator; 4. cathode gear; 5. oscilloscope; 6. capacitor battery diamond electrochemical roughing test device using parameters: fatigue layer treated electrolyte, cathode rotation The frequency n=3001000r/min, the braking torque MT=0.20.5Nm, the working voltage U=36V, the working current 2030A. The radial runout p and the toothing error H of the processed wheel can be judged. The results of its research.
Experimental Analysis (1) The value of the rotational frequency n of the cathode and the value of the braking torque MT have a large influence on the accuracy and roughness of the surface to be machined. When the MT is very small, the superiority of the diamond electrochemical finishing process is reflected in the electrochemical action stage under the fatigue condition of the machined surface; when the MT is increased, the micro-grinding process is strengthened, and the processing time is significantly shortened by 23 times.
(2) In order to achieve high surface quality of the gear teeth, it should be processed under the working current. At this time, the diamond particles work in a flat state.
(3) When the cathode rotation frequency is increased from 300r/min to 1000r/min, the time of diamond electrochemical finishing is reduced by 1.52.0 times, the original radial runout of 0.3mm is reduced to the specified value of 0.040.05mm, and the cathode rotation rate is increased. Along with the increase of the tooth profile sliding speed, the fatigue layer of the machined surface is strongly removed, the braking torque is increased by 2 times, and the machining time is reduced by 1.52.0 times (). This is because, at a large braking torque, it is ensured that the diamond particles strengthen the processed surface to a greater depth, which promotes a more intense removal of the fatigue layer. When the MT is increased and the time is reduced by 1.52.0 times, the original 0.07 mm tooth orientation error reaches a given value of 0.01 mm, and its value is reduced by 1.5 times.
(4) As the contact area increases, the pressure on the diamond particles decreases during the electrochemical finishing of the diamond; the micro-grinding process is transformed into a process of scraping the fatigue layer, and the amount of metal removed is Performed during electrochemical polishing.
In the involute region, the error is reduced because the teeth n1 of the matched cathode and the sides of the machined tooth n2 do not coincide. Therefore, the meshing condition is broken at the contact point, which is manifested by the inconsistent normal profile of the sides n1 and n2. As a result, the pressure on the diamond particles and the removal of the metal amount are increased, that is, the process of reducing the error is automatically adjusted. The involute error reduction map is as shown.
Conclusion (1) The effect of improving precision in diamond electrochemical machining is significant. The effect of the diamond electrochemical finishing method is mainly reflected in the machining allowance. Firstly, the high-productivity diamond is electrochemically ground and cut, and then converted to diamond electrochemical polishing to ensure high precision of the gear.
(2) The diamond particles have high wear resistance and can stably maintain the two-pole pitch. The distance between the electrodes is an important condition for ensuring current stability and preventing short circuits. And after the power is cut off, the diamond can be rubbed again, resulting in high precision and small surface roughness.
(3) The gear is a complex profile part. During the machining process, the three sides of the cathode at the large diameter of the tooth are enveloped by the tooth profile of the workpiece, while at the small diameter, the three sides of the work are enveloped by the cathode. Therefore, the shape and size of the cathode It is designed according to the shape of the workpiece and the distribution law of the machining gap.
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