Page 350 - Design for Six Sigma a Roadmap for Product Development

320 Chapter Nine

It is proposed to introduce ferromagnetic particles into the sealant, pressing
them (with a magnetic field) against the stem. The particles hold fast,
increase sealant viscosity, and prevent formation of blowholes.

Method 4: Improve the field
In the case of inadequate useful action:

F
Subject Object

Another common cause is that the current field is not effective in
delivering action to the object. We can try to change the field in one of
the following ways:

■ Change the direction of the field
■ Change the intensity of the field
■ Change the space structure of the field (uniform, nonuniform, and
so on)
■ Change the time structure of the field (inpulsive, accelerate, deac-
celerate, back and forth, and so on)
■ Apply a new substance between subject and object to alter the prop-
erty of the field
■ Add another field or fields to enhance the overall effects

That is, we change the original system to:

Altered
Subject Object
F

Example 9.18. Remote Electrical Welding In the electronic manufacturing
process, we need to weld thin wires in difficult-to-access areas. Electric cur-
rent is applied in order to melt the wire:

Wire
Current

However, the wire won’t melt unless the current is large; therefore, apply-
ing a high-electricity-resistant coating at the wire joint area is recommended
to ensure a voltage drop near the joint sufficient to convert the electric field
into a high-heat field at the wire joint area. This heat melts the wire and
forms a bond, but very little voltage drop will occur at other parts of wire,
leaving them intact, unaffected by the current.