How to polish stainless steel pipes? How to polish the inner wall of stainless steel pipe?

Vertical or radial drills can be used for quilting. The structure of the quilting head is cylindrical, and there are several grooves around the circumference of the oil stone bar, and the quilting can be carried out by using a grinding machine to polish the inner hole of the round pipe. The underside of the groove is fitted with a compression spring.

During the quilting, the pressure spring pushes the oil stone to the inner wall of the round pipe, and a quilting machine drives the knife bar of the quilting head to rotate up and down to polish the inner wall of the pipe. Generally speaking, the stroke of the quilting machine is much larger than that of a vertical drill or radial drill, and a longer pipe can be processed with a quilting machine. Vertical drills or radial drills can only process relatively short pipes.

The accuracy of the quilting can be achieved. Chemical polishing can only polish those pipes with smooth inner walls, and it is not suitable for pipes with poor inner wall roughness.

There are two ways to polish the inner wall of stainless steel pipes

Mechanical polishing

Stretch into the pipe with the throwing rod to drive the thousand impeller wheel or the self-made abrasive belt wheel to rotate at high speed, and polish with the rotation of the steel pipe itself, and slowly advance the throwing rod while rotating. If you feel that the mechanical polishing is not bright enough, you can apply polishing paste appropriately to increase the brightness when polishing.

Electropolishing

Electrolytic polishing is to use the thrown workpiece as the anode, the insoluble metal as the cathode, the two poles are immersed in the electrolytic cell at the same time, and the bridge is used to direct current to produce selective anodic dissolution, so as to achieve the effect of increasing the brightness of the surface of the workpiece.

Mechanical polishing is based on the grinding and rolling action of very fine polishing powder to remove a very thin layer of metal on the grinding surface of the sample. If there are deep grinding marks on the grinding surface before polishing, it is difficult to remove them by mechanical polishing alone.

Because if the grinding marks are thrown away, it is necessary to thicken the polishing liquid, increase the pressure exerted during polishing for a long time or increase it, resulting in the flow and disturbance of the metal on the surface of the grinding surface, and the thickening of the deformation layer of the grinding surface of the sample, so that the crystalline phase in some alloys will fall off.

Especially when the hardness of aluminum alloy is not too large, the oxidation of the surface layer of the grinding surface will be more serious, which will affect the observation of the structure. Therefore, the specimen that has been mechanically polished is only allowed to leave a uniform fine grinding mark in one direction after fine grinding.

The inner polishing grade 2 of the rusty steel pipe is slightly bright on the surface, and the outline is not clear.

Stainless steel brightness rating:

Visual inspection method divides the brightness of the surface of the polished part into 5 grades:

Grade 1: There is a white oxide film on the surface, and there is no brightness;

Level 2: Slightly shiny, unable to see the outline;

Level 3: The brightness is better, and the outline can be seen;

Grade 4: The surface is bright, and the contours can be seen more clearly (equivalent to the surface quality of electrochemical polishing);

Level 5: Mirror-like.

Stainless steel has been widely used because of its high corrosion resistance and decoration, especially in medical appliances, food industry utensils, tableware, kitchen utensils, etc. Stainless steel appliances should be corrosion-resistant, bright and clean and hygienic, and the surface of the utensils should not be attached to the toxic substances that destroy the body. Therefore, the surface treatment of such appliances is required, that is, to completely remove harmful substances from the surface.

The materials required for stainless steel polishing generally include: "polishing wax, hemp wheel, nylon wheel, cloth wheel, wind wheel, thread cloth wheel" and so on.

There are two methods of polishing the inner wall of stainless steel pipe: mechanical polishing with throwing rod stretches into the pipe to drive the thousand impeller wheel or the self-made abrasive belt wheel to rotate at high speed, and polishes with the rotation of the steel pipe itself, and slowly advances the throwing rod while rotating. If you feel that the polishing of the buried section of the hood is not bright enough, you can apply polishing paste appropriately to increase the brightness of the liquid book when polishing it finely.

Electrolytic polishing electrolytic polishing is to use the thrown workpiece as the anode, the insoluble metal as the cathode, and the two poles are immersed in the electrolytic cell at the same time, and the selective anode dissolution is produced by direct current, so as to achieve the effect of increasing the brightness of the surface of the workpiece.

The round tube polishing machine is also called the centerless polishing machine, the centerless cylindrical polishing machine, and the cylindrical polishing machine, which can be divided into a single group of round tube polishing machine and a multi-station round tube polishing machine. The round tube polishing machine is mainly used for rust removal and polishing in hardware manufacturing, vehicle accessories, steel and wood furniture, instrument machinery, standard parts and electroplating before and after plating, and is the best choice for polishing round pipes, round bars and slender shafts. The workpiece processed by the round tube polishing machine has high brightness and does not affect the original size of the workpiece, which is especially suitable for the high-gloss polishing of the workpiece after processing by the centerless grinding machine.

The round tube polishing machine has high working efficiency