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How to improve the accuracy of the silicone mold

by:Bofeng     2020-10-27
Silicone mold smart is the actual size of processed parts surface precision, shape, position and degree of the ideal geometrical parameters of drawing request!

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ideal geometric parameters, for size, average size, for shape, namely absolute round, cylindrical, flat, cone and lines, etc.

for each position, which is absolutely parallel, perpendicular, coaxial, symmetry, etc.

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1, dimensional accuracy

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smart parts after the actual size and the size of the consistent degree of tolerance zone center.

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2, shape accuracy

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refers to the think tank made after the actual shape of the workpiece surface consistent with the geometry of the ideal.

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3, the location accuracy

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after refers to the smart parts about the difference between the actual location of the precision surface.

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4, the relationship between the

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usually in silicone mold parts processing precision machine parts design and regulations, should pay attention to control the shape error position within the tolerance, position tolerance and should be less than the size tolerance. Also is the important surface precision components or parts, the shape accuracy requirements shall be higher than the location accuracy, position accuracy requirement should be higher than the dimension accuracy requirement.

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parts actual geometric parameters and the ideal geometrical parameters deviation value is called machining error. The size of the machining error reflects the machining precision of high and low. The smaller error processing accuracy is lower, the greater the processing precision is higher.

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a, silicone mold machining precision profile

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machining accuracy is mainly used in the production of products, machining precision and machining error are evaluating surface geometric parameters of the term. The machining accuracy as measured by the tolerance grade level value is smaller, its precision is higher; Expressed in numerical processing error, the error is bigger. Machining precision is high, is the processing error is small, and vice versa.

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tolerance grade from IT01 IT0, IT1, IT2, IT3 IT18 a total of 20, one of the highest IT01 said the parts machining precision, IT18 said the parts processing precision is the lowest, generally IT7, IT8 is the machining accuracy of medium level.

any processing method of actual parameters are not absolutely accurate, look from the function of the parts, as long as the machining error on the part drawing requirements, within the limits of tolerance that reached the machining accuracy.

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silicone mold accuracy and precision difference:

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1, the silicone mold accuracy

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refers to the proximity between the measurement results and the real value. High measurement accuracy, is refers to the system error is small, the average deviation of measurement data true value is less, but scattered data, namely the size of the random error is not clear.

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2, silicone mold precision

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refers to the repeated sample is using the same alternate between the result of the reproducibility and consistency. Possible precision is high, but the precision is not accurate. For example, use 1 mm length were determined to get the results of three 1 respectively. 051mm,1. 053mm,1. 052 mm, although their precision is high, but it is not accurate.

silicone mold precision said the correctness of the measurement results, the silicone mold precision repeatability and reproducibility of the measurement result, precision is the premise of the silicone mold precision.

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two, improve the silicone mold processing accuracy method

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1, adjust silicone mold process system

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1) Try cutting method to adjust the

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cut through the test Measuring size - Turning to adjust the knives Feed cutting - Try cutting and so on until you reach the required size.

this method the production efficiency is low, it is mainly used for single piece and small batch production of small batch production

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2) Adjustment method

through adjust the machine in advance, fixture, the relative position of workpiece and tool to obtain the required size. This method high productivity, is mainly used for small batch trial production and small batch customization.

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2, reduce the error of machine tool

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1) Improve the manufacturing precision of the spindle assembly

should enhance the rotation accuracy of bearing:

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a, choose high precision rolling bearings

two, with high precision more oil is woven

three dynamic pressure bearing, using high precision hydrostatic bearing,

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should improve the accuracy of and bearing accessories:

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a, improve housing support hole, the machining precision of the spindle shaft neck;

two, improve the machining accuracy of to match the bearing surface;

3, measurement and adjust the corresponding range of radial runout, make or phase offset error compensation.

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( 2) For rolling bearing preloaded appropriate

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a, can eliminate the gap;

2, increase the bearing stiffness;

3, homogenizing rolling element error.

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3, reduce the transmission chain error

1) Drive less number, transmission chain is short, high driving accuracy;

( 2) By slow down transmission, the transmission accuracy is the key principle, and the closer it gets to the end of the drive, the smaller the ratio should be

3) Ends should be higher than other transmission precision parts.

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4, reduce tool wear

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in front of the cutting tool wear size of sharp wear stage will have to change again.

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