Spinning parts are generally rotary cylinders or discs, and spinning blanks are usually thick-walled cylinders or circular sheets.
The principle of spinning accessories is on the position of the large carriage of the lathe. It is designed as a rotary frame with axial movement power. The rotary wheel fixed on the rotary frame can move radially. Coaxially connected with the main shaft is a mandrel (shaft), and the spinning blank is sleeved on the mandrel (shaft). The rotary wheel rotates passively in reverse through the friction force generated by the contact with the blank sleeved on the mandrel (shaft). At the same time, the rotary wheel frame moves axially under the action of the axial large thrust oil cylinder.
Types of spinning pulleys Under the joint action of the axial force of the spinner frame and the radial force of the spinner wheel, the surface of the blank is subjected to point-by-point continuous plastic deformation. At the position of the tail top support of the lathe, it is designed as a tail top hydraulic cylinder with the same axis as the main shaft, and the hydraulic cylinder exerts axial thrust on the blank end surface sleeved on the mandrel (shaft). The base of the spinning fittings is made of aluminum alloy with a thickness of 2mm. Aluminum is in a relatively negative position in the electrochemical sequence, and it has an extremely high affinity for oxygen. Difficulties. After the oxide film on the surface of aluminum and aluminum alloy is removed in alkali solution, a new oxide film will be formed soon when it encounters oxygen in the air. This layer of oxide film will seriously affect the bonding force between the electroplating layer and the substrate.