高速加工 VS 高効率加工

高速加工が話題となっていますが、実際のところ「高速」加工とはどういうものでしょう?単純に最大の送り速度で走り、複数の浅いパスをとることを言うのでしょうか?実際にこの方法でやってみると、少し深くパスをとった場合より、効率が悪くなることもあることがわかりました。切削時間を最短にするには送り速度が関係しますが、それは必ずしも「最速の送り=最高の効率」を意味するとは限らないのです。高効率加工、すなわち、部品を最短の時間で加工することこそ、本来の目的のはずです。 この高効率加工を実行するために重要なのは、各切削条件に合わせて、実行する送り速度を変えることです。
 
 
 
「通常高速加工では、表面を美しく仕上げ、工具、材料、スピンドルへのダメージを避けるために、たいへん浅く削ります。しかし送り速度の最適化ソフトを利用すると、高速の送りを保ちながらもより深く削ることによって効率を上げることができ、なおかつチップの負荷が瞬間的に増える箇所では工具等を守ってくれます。また一定に保たれるチップ負荷のツールパスにより、工具の強度や機械の速度・馬力が最適化されます。このソフトはチップの負荷が大き過ぎるという条件を検出すると、送り速度を適切なレベルへと調整し、少なくなるとまた戻してくれます。」
      Alan Christman, CIMdata
     Software Trends Enhance Moldmaking 社
     MoldMaking Technology 誌, 2002年11月号より
 
たいへん軽い切削の場合に最大の送り速度で切削すると、小さなステップダウンやステップオーバーが多くの(時には)効率の悪いパスを要求し、時間短縮という目的を妨げることがあります。またより深く切削することで(この場合 .500" 対 .100")効率は上がりますが、工具が破損したり、機械の能力を超えてしまう可能性も出てきます。
 
 
ここで自動最適化ソフトがその威力を発揮します。ベリカットは各切削セグメントでどれだけの材料が除かれるかを正確に知り、負荷が大き過ぎる箇所では送り速度を落とします。これにより工具破損を防ぎ、機械がその力の限界を超えないようにします。可能な箇所では同じ早送りが維持されますが、各パスを .100"で切削しながらステップダウンする場合より、効率が上がり時間が短縮されます。
 
Airbus is selling so well that the demand to increase build rate has never been higher. BAE Systems (Filton, UK) needed a simple way to improve throughput - it found the answer in VERICUT.
With VERICUT, engineers at Stellex Monitor modeled the Sidewinder and Spar Mill machines.
Tell Tool of Westfield, Mass., has integrated VERICUT CNC simulation software into its numerical control program prove-out process.
VERICUT enabled us to start ordinary production after a minimum of time. Since this product is new for Volvo Aero Norge and our company had never before had parts with similar machining complexity, it is difficult to estimate the amount of cost saving.
Before implementing VERICUT, the company experienced the usual time-consuming and expensive manufacturing problems related to NC program prove-outs such as scrap loss, broken tooling, and a danger of occasional machine crash.
Over the last two years, AH has used Machine Simulation to speed the implementation of several new 5-axis machine tools.
VERICUT showed the NC programmers leftover or heavy stock." And the software detected a couple of places where the depth of cut was too large and tools were shanking out," said Collings. They then went back and corrected the errors in the tool path before
Dassault, Seclin initially purchased VERICUT in order to reduce the number of manual prove-outs using polystyrene material, which represented a significant expense in terms of time and money.
VERICUT enabled the designers and programmers see exactly what they were building as and in-process model in different stages of the machining cycle.
We utilized VERICUT to verify the CNC programs for cutting the tooling before they were sent to the machine control,
To protect their investment, they have been using VERICUT since 1996. They have two people to verify the accuracy of their G-code files.
"When we first started using OptiPath we concentrated on the feed rate option; now we use the constant chip thickness capability. With jobs up to 200 hours long, 50% saving is significant like having another machine tool."
The entire process took less than two hours and no manpower was required, whereas, creating the same pattern manually (the old way), would have taken one of our designers several days.
The verification process stays ahead of the actual machine position in the NC code being verified. Opera-tors can see errors before they occur.
The bottom line? Using VERICUT has made Supreme's existing machine tools more productive. Enthusiasm is up, delivery times have been reduced, and pricing is more competitive.delivery times have been reduced, and pricing is more competitive.
Using VERICUT to compare the electrode burn with the mold cavity ensures that we have all the correct clearances in the electrodes and that we have 100% clean-up." says Allen.
If I was using VERICUT at the time I would've caught the problem, and had a chance to fix it before it damaged the part.
Now I rarely see the potential crashes because the students find and correct them before I review the work. Catching those costly problems is a non-event now!
VERICUT can change speeds and feeds according to cutting conditions including difference in material and tooling. It is done automatically; the programmer does not have to make even one manual insert into the code."
Flying shrapnel from shattered cutting tools and components is avoided by using VERICUT to test student programs before they are run on NC machines.
The NC programmers at Ingersoll also rely on the simulation software to prevent mistakes when programming complex, five-axis parts.
After creating the NC programs in Mastercam, they began simulating the machining process in VERICUT by simulating the G-code data. There often can be a difference between the motion as programmed and the code after it's run through the post processor
After selecting VERICUT for third-party verification, each NC programmer attended two days of basic training where they experienced first-hand the type of results they could expect to achieve.
The program simulates milling, drilling, turning, wire EDM, and mill/turn machining operations using both G-codes and CAM output.
VERICUT provides simulation capabilities for the all the 3-5 axis and wire EDM parts, with focused control over the orientation of our 5-axis machine tool including the cutters used on that machine.
The inspection probe is created as a tool in VERICUT so the complete in- cycle gauging sequence is checked for collisions.
The bottom was machined first. This effort took about 24 hours from start to finish. By using VERICUT software from CGTech, Elliot was able to test the NC program for any problems before it was ever cut on the machine.
Cosworth Racing Integrates Walter TDM Tool Management into Manufacturing Systems
With data exported from NX, Vericut simulates the cutting process on the shop floor utilizing the machine G-code to detect any issues prior to NC Program release.
マシンシミュレーション
干渉チェック
加工シミュレーション
切削シミュレーション
機械シミュレーション
NCプログラム検証
機械加工検証ソフト
加工プログラムチェック
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