Tungsten carbide roll

1-1

Check whether the roll surface has shock, twill, bump, sand hole, hole, etc.

Visual measurement

1-2

Check whether the size of the roll meets the technical requirements in drawing?

Calipers and Micrometer

2-1

1. Lift the roll to the special rotary tooling for dehumidification and oil removal.

2. The roll must be rotated during dehumidification.

2-2

Revolution: check the tachometer

Baking time: automatic walk back and forth

Baking temperature: remove moisture and dry the surface.

Cleaning agent type: special cleaning agent

3-1

The air used for sandblasting is filtered by condenser and filter when it comes out of compressor. White paper shall be used for detection before each use.

The method is as follows: blow white paper with compressed air for 1 minute, with a distance of 100-150 mm, and observe whether there is water or oil stain.

The air used for sandblasting is filtered by condenser and filter when it comes out of compressor. White paper shall be used for detection before each use.

The method is as follows: blow white paper with compressed air for 1 minute, with a distance of 100-150 mm, and observe whether there is water or oil stain.

3-2

Sandblasting equipment: pressure type automatic sandblasting machine

Spray gun: 1

Sandblasting angle: 60 ° - 90 °

Sandblasting material: white corundum

Nozzle diameter: 6-7mm

Spray gun distance: 200-250mm

Sand blasting air pressure is 0.45 ~ 0.75mpa

Sandblasting equipment: pressure type automatic sandblasting machine

Spray gun: 1

Sandblasting angle: 60 ° - 90 °

Sandblasting material: white corundum

Nozzle diameter: 6-7mm

Spray gun distance: 200-250mm

Sand blasting air pressure is 0.45 ~ 0.75mpa

3-3

Inspection after sandblasting:

1. Use compressed air to blow clean the workpiece surface.

2. The surface cleanliness after sandblasting shall reach ISO 8501 SA3.

3. Use roughness meter to measure according to the technical requirements, to meet the requirement that the roughness of the finished roll surface is determined.

ISO 8501 Sa3

Roughness tester

5-1

1. After spraying, the roller is hoisted to the special large grinding machine for peak removal.

2. Special polishing belt must be used for polishing.

3. Meet the roughness requirements of drawings.

4. Measure and record the roughness.

 1. After spraying, the roller is hoisted to the special large grinding machine for peak removal.

2. Special polishing belt must be used for polishing.

3. Meet the roughness requirements of drawings.

4. Measure and record the roughness.

Dial indicator and Roughness tester

5-2

Roughness tester:

MITUTOYO SJ-301

6-1

1. The qualified roller shall be packed with special wrapping materials.

2. The packed roller must be placed on the shockproof pad when stacking.

3. the workpieces must be stored off the ground, and shall not be stored in the environment with damp and corrosive liquid.

VM

6-2

Post the required qualification mark

Finished

Drawing No.

XXXX

Roll Name

 Roll

Spraying Equipment

PRAXAIR from America

 Equipment Model

JP-5000

Spraying type

Supersonic spraying

technician

 Chen Guoli

4-1

The spraying must be completed within 2 hours after the end of the previous process. If the spraying is not finished after 2 hours, the roll srface must be sandblasted again.

Clock

4-2

Use compressed air to blow the surface of roll before spraying.

VM

4-3

1.Types of materials: materials are selected according to the requirements of the drawings

Material for spraying:

Praxair 1375/H.C STARCK558 or H.C STARCK 519

2.Material Specifications：Size

  15-53μm

VM

4-4

Supersonic spraying parameters

Unit type：JP5000

Air carrying capacity：29

Oxygen quantity：1950

Kerosene quantity：6-6.2

distance:300-350mm

powder feeding rate：65g/min

（JP-5000）

HVOF spraying equipment（JP-5000）

4-5

1. Use jp-5000 spraying equipment produced by Praxair company to operate and construct.

2. Check whether the spraying tooling is installed in place again before spraying.

3. Carry out the construction according to the specified spraying parameters.

4. After spraying, use compressed air to clean the surface of the roll and remove the residual dust (spot welding at both ends of the roller with test block reserved for standby and testing)

4-6

Coating inspection:

1. Coating thickness requirements: test with thickness gauge according to the drawing.

2. The coating surface shall be free of splashes, peeling and cracking.

3. The coating thickness is uniform.

thickness meter