top of page
SANKO GOSEI

Temperature conditions for shaft inserts

It is recommended to heat the shaft above the softening temperature of the resin and push it in with a jig.

The shaft insert machine manufactured in-house by Sanko Gosei is designed with the following operating conditions as a guide


① Press-in load and shaft temperature


②Press-fit allowance (gap between shaft diameter and prepared hole diameter)

0.2 to 0.4 mm in diameter (aim for about 0.3 mm)

However, in the case of oil-impregnated metal, preheating is difficult, so the press-fit allowance should be reduced by an order of magnitude to about 0.02 mm


③Knurling

Common twill (Dianal)


It was difficult to meet the standards for coaxiality and perpendicularity when inserting the shaft metal fittings at a temperature that melts the resin, so there was a time when cold press-fitting was performed. However, it is difficult to achieve accuracy in cold work, and if the press-fitting allowance is increased, cracks will occur due to residual stress over time, causing a serious problem.

Therefore, the shaft must be heated above the softening temperature of the resin before being press-fitted.


*The metal insert (female thread side) for receiving M3 screws, etc. must be press-fit after melting the interface resin to a temperature above its melting point.


~Related Articles~

36 views0 comments

Recent Posts

See All

Comments

Rated 0 out of 5 stars.
No ratings yet

Add a rating

Concerns about plastics
Did you solve?

You can find the desired content from the
top page content from the top page.

23989485.png

★月間アクセスランキング★

bottom of page