For beginners, many spinning workers do not know how to make a correct CNC spinning program. The spinning debugging technology includes many details that need attention. Besides the correct drawing of the tool path and the writing of the CNC program, the installation of the  mold (mandrel) and the roller (wheel), the elimination of machine problems, these details all affect the spin forming. There are 11 steps to finish the CNC spinning programming.

1. Metal spinning mandrel

When the factory get order from customer, your client will send the drawings of metal spinning product to you, you need to analysis the specification, materials and shape of the metal spun product, then design the mandrel and choose the right material of mandrel .

How to make and design a mandrel ＞

2. Choose a right CNC metal spinning lathe

① Appearance and production speed requirement

When the metal spun product is little, (such as diameter＜300mm,aluminum thickness＜  1.5mm, steel thickness＜1mm, stainless steel＜0.8mm) and soft materials can made by little CNC metal spinning machine, it have high spindle speed and feed speed, so it can spin metal spun products more quickly and smoothly.

② Tolerance requirement

When the metal spun products need to control the diameter tolerance, as we all know, the metal cold working and pressing have the spring back, it effects the final accuracy. The better way need to make it in the heavy duty and double roller machine, it can reduce the metal springback and can make the workpiece hold the mandrel tightly.

How to control the accuracy of metal spun product ＞

③ Thicker, bigger and harder metal blank

When the diameter ＞ 600mm, the aluminum thickness＞8mm, stainless steel ＞5mm, steel thickness ＞6mm, the metal hardness ＞ stainless steel, you need to choose a heavy duty and the machine blank specification＞1200mm, it can output more spinning force.

4. Blank estimation

The evaluation of the material sheet includes the diameter and thickness of the material,except necking can increase the thickness, sheet spinning and expanding reduce the blank thickness, you can calculate the diameter by thinning rate and different metal spinning shape.

How to evaluate the thickness and diamond of spinning material ＞

5. Blank material cutting

You can using plating laser cutting to cut the round sheet that used in sheet spinning, using the tube laser cutting to cut the tube that used in the tube spinning.

6. Choose a right roller

Choosing a right machine can reduce the risk of break or crinkle in the spin forming, except the diameter and radius, the shape of roller is also important to avoid interference with the mandrel.

How to choose a right spinning roller ＞

7. Tool path drawing

Even though the tool path drawing is hardest work for spin forming, it need to make different shape and accumulate a lot of experience, If you want to have a good learning process, you can give yourself a reasonable plan.

1. Learn to how make the shearing spinning, it is the simple in spin forming.
2. Learn to how make a aluminum conventional spinning, good ductility of aluminum is better to spin.
3. Choosing different shape to spin, such as cone, hemisphere, trumpet, head, cylinder.
4. Using the stainless steel to spin a cylinder that height ＞ 150mm.
5. Trying to make the workpiece hold mandrel tightly and control the tolerance.

The CNC metal spinning path and parameter ＞

7. Making a CNC program

To learn to create numerical control programs, one must understand the coordinates of numerical control programming. Generally, machines have absolute coordinates and relative coordinates. The program of numerical control programming is executed according to the coordinate position of each point of the roller.

In addition, you need to understand the machine operation instructions. This CNC spinning machine manufacturer will provide you with an instruction manual, The main instructions include spindle rotation, feed speed, linear motion and circular arc motion

8. Parameter setting

Actually the diameter and thickness is less, the spindle and feed speed is quicker. The following parameters can be provided for your reference.

9. Mandrel installation and roller installation

Mandrel needs to keep the installation plate is clean. Otherwise the mandrel will runout when the plate have dusty or fillings, Mandrel needs to control runout is less than 0.04mm, the roller needs to control the runout is less than 0.02mm, when you finish roller assemble, you use hand to feel whether the roller move from axis direction, you must control roller just can spin smoothly without moving in axis direction.

10. Clamp adjustment

The clamp usually tends to runout after long-term use, you can check the the plane of clamp whether it is scratches or the hydraulic cylinder is bending, and the bearing is worn out. Clamp runout is less, the bottom of the metal spun product is better, the final accuracy is better.

Adjusting the right clamp hydraulic pressure, as long as the force of clamp can hold the blank on the mandrel, it can reduce the hydraulic pressure as possible, the hydraulic pressure is bigger, the bearings of spindle and clamp wear quickly.

11. Numerical control program simulation

It is mainly for checking the correctness of numerical control programs and wrong CNC program work to impact the machine. You can stop the spindle, using less feed speed and bigger gap to run the CNC program. During this process, to test the gap between the roller and mandrel, when you make sure the CNC program is right, you can adjust the right feed speed and gap back, then you can put the blank on the CNC metal spinning machine tool and run the CNC program to spin forming.