Dongguan Dinnovation CNC metal spinning Co,. Ltd.
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① Bucket CNC spinning casebucket CNC spinning case show

Bucket is a common metal product made by metal spinning  , it is easy to break when the roller spin many times when height is too long. you can choose the bigger radius of roller to reduce the risk of breaking , Except the problem of spinning breaking ,demold is another problem that you should know .We will tell you how to settle these problems in details .

● Cutting the edge when roller spin many times

The edge is irregular when roller spin many times,usually the metal sheet will break in the half of the spinning routine ,you can check whether the edge is not round ,the thickness of the edge is different that cause the wrinkling ,the longer edge bear more force than the shorter edge ,so longer edge position is easy to break  .So you should cut the edge before the wrinkling and breaking.

● Demolding problems

Demolding is a important element for bucket metal spinning .As the height is high ,it is hard to take out the product from mold when spinning finnish .There are two ways of demolding that you can use .First ,designing a angel in the mold ,it is about 0.2°-1°, this website introduce it in details Second ,you can design a demolding fixturing inside like the picture show ,the inside fixturing use a turning cylinder to provide demolding force to pull the bucket out .

② Venturi CNC spinning case 

● Which position is easy to break  

It is hardest to spin if  venturi is made by stainless steel 304 ,the bad ductility of SUS304 and complex shape of venturi make it break when it spin  ,So we should use the metal spinning technology to overcome the broken situation .There are two easy broken position that you should known in the picture .

● How to control the flatness of venturi 

If you overcome the broken problems ,then you should adjust the flange flatness of venturi .First ,you can adjust the gap of  roller and mold . Second ,adjusting spindle speed and feed speed to control the flatness .Third ,you can repair the mold in the flange position like the picture show ,you can turning a angle to overcome the stainless steel rebound after CNC spinning .

● Demolding design 

The last problem is the demold ,you can design a demold part like the picture show ,when you turning the bottom of venturi ,the demold part can take off  from the venturi .

● The hardness of the spinning roller and mold

We must use CR12mov steel to make the spinning mold and roller ,using the heat treatment to improve the hardness of mold and roller surface ,the spinning roller should use the electroplate to improve the exterior hardness and wear resistance ,otherwise spinning roller wear quickly and make the product break in the spinning .

● Heating the sheet stainless steel 304 before spinning 

It is about 30-50 seconds to heat sheet and make the sheet soft ,it is easy to form when the sheet is softer and The broken situation will reduce .

③ CNC neck spinning case 

CNC neck spinning case show

The most important thing of neck spinning is that the fixture can hold the tube tightly ,how to choose the fixture that we will introduce it .

● Thin wall or aluminum neck spinning 

You can choose pneumatic fixture that move fast and can improve the production efficiency .it can bear high spindle speed and the temperature doesn't rise too much after a long time spinning  .

● Thick wall or stainless steel neck spinning 

You can choose hydraulic fixture that can hold the tube tightly ,otherwise the tube can move out in CNC spinning as the spinning force is strong .

● How to control the accuracy  

You can design the inner mold that can make the accuracy better . 

④ Liner and Cone CNC spinning case

cone CNC spinning process case show

Cone is a common product in sheer spinning ,the product includes funnel ,liner ,lampshade and so on .The thinning rate of sheer spinning is different from conventional spinning.If you want to make the surface smooth ,you should adjust the rate of spindle speed and feed speed .You can also adjusted the gap .if the gap is too little ,the metal will backflow and the machine will shake ,the bottom will have litte gap ,and surface will have shaking line like the picture shows ;if the gap is too big ,the interior surface will not be bright and smooth .So we should adjust the clearance in correct value.

We all know liner is a military part ,the technical requirement is very high .If you want to make precision liner ,you should consider the assembling precision of  mold and spinning roller .you should use the morse taper to assemble the mold to make sure the assembled accuracy every time .The other details you can browse this website

⑤ Signal cover CNC spinning case

signal cover CNC spinning case show

The curve of signal cover is important requirement ,the accuracy of curve impact the signal transformation . How we can make the accuracy better ,there are two ways to adjust .First ,you can adjust the mold shape to overcome the metal rebound .We can see the picture show ,if metal rebound make the product and mold have some clearance after CNC spinning ,we can check it by inspection tool ,then we can adjust this part of mold to reduce rebound. Second ,choosing right CNC spinning path is important ,we can check the gap of mold and roller ,we introduce it in cone CNC spinning  case .of cause ,the roller feed and rotate speed is important too ,you had better to spin the sheet just one time ,if you spin it to adjust again ,may be the rebound is serious .

⑥ Deep drawing and CNC spinning case

CNC spinning and pressing case

We can use the deep drawing as the first step for some deep products(the height is over 300mm), it can improve the production efficiency by deep drawing , we should keep a rounded angle like the first picture show ,if there are a shape angle that will improve the intensity .so it will be not smooth after cnc spinning or it easy to broke .

The aluminum and steel can spin like the second picture ,but stainless steel can not ,because the hardness and intensity of stainless steel is bigger ,when we spin like this ,the angle will crack .

⑦ Flanging CNC metal spinning process case

flanging CNC spinning case

You should use two steps to finish spinning ,the first step you can spin the inside part of product ,this step you should keep the gap is little ,because the ratio of sheet diameter /minimum mold diameter is big ,if the gap is too big ,the part of sheet that is close to the position of minimum mold diameter is easy to crack  , we can see the position in the picture ,this position should have a rounded angle .The second step we can finish the flanging, the spinning forming is easier than the first step .but we should keep the flatness ,we introduce it in venturi case ,the thickness of the flange is different form point A to point B, the thickness increase form point A to point B, so the different intensity and innerstress make flange rebound .We can adjust the flatness of flange to overcome the rebound ,but we can't adjust the thickness of flange .