Factors and control points of wrong and missed detection of grinding wheel

Definition: The appearance of the unqualified grinding wheel product is not checked out, and the qualified product is packaged and put into storage.

Inspection method: visual inspection

Harmfulness:

  1. Customers reduce their trust in product quality, management level and company image.
  2. Customers of substandard products cannot use them normally, causing economic losses to customers.
  3. When a customer returns a product due to an error or missed inspection, re-inspection requires a lot of manpower and material resources, causing great economic losses to the company.
  4. Unqualified products have potential safety hazards, which may cause personal injury to users in serious cases.

Cause of:

  1. Inspectors are not very responsible, and fail to inspect the grinding wheel as required.
  2. Inadequate supervision of management personnel.
  3. Inadequate training.

Quality Factors and Control Points of Mixture Leakage

Definition: The mixture has poor uniformity and more free powder.

Inspection method: visual inspection

Harmfulness:

  1. The production workshop is dusty.
  2. The vibrating sieve machine screens the material, and the powder is layered.
  3. Poor stability of the forming material and poor static balance of the grinding wheel.
  4. The structure of the grinding wheel is uneven, the appearance of the grinding wheel after hardening is poor, and the hole diameter and edge flow material.
  5. The hardness of the grinding wheel is uneven, the consumption is uneven during use, and the edges are easy to chip off.

Cause of:

  1. The powder-to-liquid ratio is unreasonable, and the amount of resin powder added is small.
  2. The material fork of the mixing pot is severely worn, and the resin powder on the side of the pot is difficult to mix evenly.
  3. The mixing time is not enough when mixing, and the powder is separated from the material after parking.
  4. Poor compatibility between resin liquid and resin powder.

Quality factors and control points of grinding wheel slippage and less network

Definition:

Leakage net—the internal net part of the grinding wheel leaks out.

Less net—The net is not placed in the grinding wheel as required.

Inspection Method:

Leaked network, external network—visual inspection.

Built-in network-the next station operator visual inspection.

Harmfulness:

  1. Lost the net: (1) Affect the appearance of the grinding wheel, and the product has no market competitiveness.

(2) The abrasive grains at the leaked mesh have poor cohesiveness and are easy to sand out.

(3) In use, the safety is poor. In severe cases, the grinding wheel may break, causing personal injury.

  1. Less network: The strength of the grinding wheel cannot meet the safety requirements of the design, and the grinding wheel breaks directly when the worker is in use, causing personal injury.

Cause of:

  1. The coarse particles of the mixture cause difficulty in spreading and leak through the net.
  2. The scraper is not adjusted well or the spreading speed is fast, which leads to partial failure and slippage.
  3. The mesh is not well compressed during pre-compression: the mesh is not flattened or compacted, and the mesh partially floats during the spreading process, causing the internal mesh to leak.
  4. Too much waxing will cause wax masses to be formed in the spread material, which will form a slip through the net after hardening.
  5. The operation is not careful, and the material mass is not processed in time.
  6. Less network:

(1) The program design of the automatic unwinding device is unreasonable, and no automatic shutdown is detected when the net is not released.

(2) The operator is not serious, and the net has not been put out without checking out.