Author: Site Editor Publish Time: 2019-07-30 Origin: Site
Grinding is a method of finishing, and grinding waste are rarely seen. Due to the dimensional accuracy of the valve sealing surface, grinding waste is even rarer. Frequent occurrences of sealing surface grinding are irregularities in geometry, surface scratches, and grooving. Common defect forms, causes, and prevention methods are as follows.
List of content for this article：
1. Difference defects form for industrial valves,
2. Prevention methods and maintenance for different defects.
Defect form: scratched, napped
Cause one: the abrasive is mixed with individual coarse abrasive grains.
Prevention Method 1: The abrasives can be sorted by adding water precipitation method, and the maintenance of abrasives can be strengthened.
Cause 2: Dust, iron filings or other debris in the abrasive
Method 2: Containers containing abrasives should be covered and kept clean during configuration
Cause three: the part is not clean or has burrs
Prevention Method 3: The sealing surface should be deburred and cleaned before grinding.
Cause 4: Grinder or lap is not clean
Method 4: The first research machine is best separated from the fine grinding machine, and the cleaning machine and the rig are cleaned.
Cause 5: excessive dust in the workshop
Prevention Method 5: Establish a closed grinding chamber and keep the room clean
Defect form: knife mark or pull groove
Cause one: the quality of the previous process is not good, the luminosity is too low
Prevention method 1: The part should be ground before grinding, and the luminosity should not be lower than ▽6 when using the finishing vehicle.
Cause 2: Abrasive material is too thick
Prevention Method 2: Use fine abrasive
Cause three: the cutting heat generated during grinding is too high
Prevention Method 3: Reduce the grinding pressure, reduce the grinding speed and often add abrasive
Defect form: geometry is incorrect
Cause one: improper grinding movement
Prevention Method 1: Improve the grinding movement
Cause 2: The abrasive is too thick or unevenly coated
Prevention Method 2: Use a thinner abrasive and pay attention to a uniform coating
Cause 3: uneven grinding pressure
Prevention method three: the force should be uniform when grinding by hand
Cause 4: Poor precision in the previous process
Prevention Method 4: Improve the machining accuracy of the previous process and pay attention to prevent the part from deforming
Cause 5: Grinding time is too long
Prevention Method 5: Reduce the grinding allowance, try to use coarser abrasives or increase the grinding speed and increase the grinding pressure
Cause 6: The rig is not accurate
Method 6: Check and repair the rigs frequently. When the lap is too fast, you can use other wear-resistant materials.