Data name
　Clamp with a complicated shape (How would you process it at your company? Processing with 3 steps)
Overview
　
The works of No1 and No2 below have a complicated figure. Furthemore, there are engravings from both side, and remaining thickness becomes as thin as max2.25min 1.0 As a result, it is difficult to clamp the producut using common method. Therefore, this work is processed, using resin as afixer.
Keyword: vibration, clamp, clamp distortion
Work No1 which is difficult to clamp

Back and front

It is cut out from the board of material size　110×200×16
Dimensions of finished product: Vertical 70×width162×thickness MAX12.5MIN1.0(rib width 2×thickness1.25×length 36)Material A5052
Work that is difficult to clamp No2
　
Back and front
　
It is cut out from the board of material size70×160×10.
Finished dimensions of product:Length43.3×136.2×thickness MAX8.5(rib thickness MIN0.75)Material A5052
result
　It is finished with no clamp distortion, processing strain, and no-vaibration.
Commentary
Although it is hard to be detected in the photograph, it is not possible to be clamped by the vice, because it has a complicated figure and a groove from the back side of the surface.
In such a case, the melthod often used is fixing a work with per urethane resin.
As process
　1）Drilling of the surface from the material plate(machining)
　2）Pouring resin into the surface groove(manual work)
　3）Reference processing of the surface into which resin is poured(machining)
　4）Processing and cutting from the back side(machining)
　


 The first step
Cutting a groove into the surface.

　　　

 Injection of per-urethane resin
(It is convenient to put nylon, delrin, etc.for ease of removal)



In the second step
Cutting reference plane of per-urethane resin part
(When processing distortion occurs in the first process, vacuum chuck can correct it)



The third step
Digging and cutting of the back side(blue part is work)
(When vacuum chuck is used in the second step, it should also be used in this step)
removal
When there is nylon, delrin, etc, screw up, and pull out, and air blow. When it is difficult to be detached, putting it in hot water makes it easy.
advantage
　・This method has the advantage of being able to fix the work as it is.
　・We do not need an expensive jig.
　・Novibration during cutting, and dimensional and surface accuracy improves.
Disadvantage
　・It's not suitable for mass production.
Other
　・When used in combination with avacuum chuck, another interesting effect occurs.



Light brown parts are per-urethane resin. Multiple points in resin are molded chips.
The blace dot of the 3rd photo is the hole for remobal of air blow.
Used Pel/urethane resin and molded chip

Pel/urethane resin used in this case is MU-986 of Nippon pelnox Corporation.
Molded chips are mixed in order to deter the shrinkage of the per urethane resin.
Other processed sample
Point of work
　
The curing time of MU-986is supposed to be 30minutes(10minutes, 20minutes, and 30minutes, curing time types are included in the catalog), but it takes about 1hour to cure.(It generates heat while curing, but it can be processed once it gets cold)
　Although it can be taken away using air blow, it is convenient to set it in a way so you can hit with praghan.
Although not per urethane, you can use these as altematives.
Solid at nomal temperatue, and becomes like clay when heat is applied. there is no actual record yet.
(Free resin)

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