1, the operating instructions for the preparation of: according to equipment for the preparation of items that can be processed, which includes operations job preparation and job steps, process characteristics control requirements (processing device parameters, such as grinding diameter, the workpiece and wheel speed , sand turn trimming frequency, slim bearing, eccentricity, etc.; channel coarse and fine, overtime, workpiece speed, beat frequency and angle Whetstone, Whetstone pressure and ultra-precision time and other parameters; tooling adjustment norms, etc.), product characteristics control requirements (process control projects, testing tools, etc.), the main products project failed rework operations guidance.
2, the product process control plan preparation: There are general and specific product model two kinds. Sequential arrangement by a process flow diagram of the process carried out, work number is consistent, some processes can be combined, but the need for notes, such as demagnetization cleaning. Characteristics projects and processes should be the same size cards, it is important also need to specify the process characteristics, such as grinding channel, the wheel speed, workpiece speed, light grinding time, dresser, etc., generally have the book provides guidance on the job, you can indicate references . There are specific types of product specification shall control the planning process and grind super size card processing agreement. Also the measurement technology, measurement sampling samples, control methods and error proofing, response plans and corrective measures, according to the actual production can do and control and to ensure quality content preparation, because of the part of the production control plan requirements must be process control.
3, the product of the preparation process failure modes: first by a process flow diagram and the process of risk assessment, was named high-risk failure analysis to be done.
There are general and specific product model two kinds. Sequential arrangement by a process flow diagram of the process carried out, work number consistent. Included were rated high risk of failure processes may require the presence of all, the possible consequences, which may be the reason of being a means of control methods, and the possibility of them out, and whether measures need to be taken and so on.
Such as grinding end faces potential failure modes and failure reasons: ① width size is too large or too small, mainly related to the grinding time
And stress-related; ② parallelism tolerance, when using the vertical shaft surface grinding machine, its failure causes the wheel spindle is not perpendicular to the magnetic table, magnetic units surface wear, magnetic units magnetic enough, grinding work, "slip", magnetic units surface dirty, dirty work or face burr, magnetic rotary precision is not high, when using double end grinder, the two parallel grinding wheel face is not good, two wheel face serious wear and tear, improper installation exit guide plate, grinding I such as excessive; ③ flatness tolerance, when using the vertical shaft surface grinding machine, its failure causes a workpiece is too thin, heat deformation, wheel too hard, cutting fluid supply, etc., when using the double end grinder, the main export at the guide plate is not properly installed and so on.
Grinding diameter when the potential failure modes and failure reasons: ① aperture is too large, the bearing surface size tolerance, was grinding the workpiece aperture to remain excessive, over automatic feed stroke, etc.; ② tolerance ellipse, oval workpiece support surface too large, reflected in the mill complex on the surface of the workpiece support surface with card injury; ③ cylindricity tolerance, the workpiece spindle axis and the wheel axis is not parallel to the centerline, wheel dressing well, wheel width too wide, vertical reciprocating distance is too short, rough cylinder through the large, rough diameter stay excessive infeed is too fast, too short a time without feeding, wheel too soft; ④ holes face is not perpendicular magnetic clamps enough support position not equal.
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