Method for hot press forming articles

Patent · Fri Jan 01 00:00:00 EST 1982

OSTI ID:864135

Baker, Robert R ^[1]; Hartsock, Dale L ^[1]

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1. Livonia, MI

This disclosure relates to an improved method for achieving the best bond strength and for minimizing distortion and cracking of hot pressed articles. In particular, in a method for hot press forming both an outer facing circumferential surface of and an inner portion of a hub, and of bonding that so-formed outer facing circumferential surface to an inner facing circumferential surface of a pre-formed ring thereby to form an article, the following improvement is made. Normally, in this method, the outside ring is restrained by a restraining sleeve of ring-shaped cross-section having an inside diameter. A die member, used to hot press form the hub, is so-formed as to have an outside diameter sized to engage the inside diameter of the restraining sleeve in a manner permitting relative movement therebetween. The improved method is one in which several pairs of matched restraining sleeve and die member are formed with each matched pair having a predetermined diameter. The predetermined diameter of each matched pair is different from another matched pair by stepped increments. The largest inside diameter of a restraining sleeve is equal to the diameter of the outer facing circumferential surface of the hub. Each pair of the matched restraining sleeve and die member is used to form an article in which an inside hub is bonded to an outside ring. The several samples so-formed are evaluated to determine which sample has the best bond formed between the hub and the ring with the least or no cracking or distortion in the ring portion of the article. Thereafter, the matched restraining sleeve and die member which form the article having the best bonding characteristics and least distortion cracking is then used for repeated formations of articles.

• DOE Contract Number: DAAG-46-71-C-0162
• Assignee: Ford Motor Company (Dearborn, MI)
• Patent Number(s): US 4315876
• OSTI ID: 864135
• Country of Publication: United States
• Language: English

Related Subjects

method
hot
press
forming
articles
disclosure
relates
improved
achieving
bond
strength
minimizing
distortion
cracking
pressed
particular
outer
facing
circumferential
surface
inner
portion
hub
bonding
so-formed
pre-formed
form
article
following
improvement
normally
outside
restrained
restraining
sleeve
ring-shaped
cross-section
inside
diameter
die
sized
engage
manner
permitting
relative
movement
therebetween
pairs
matched
formed
pair
predetermined
stepped
increments
largest
equal
bonded
samples
evaluated
determine
sample
thereafter
characteristics
repeated
formations
inner portion
outside diameter
hot pressed
improved method
disclosure relates
relative movement
inside diameter
manner permitting
hot press
bonding characteristics
matched pair
forming articles
shaped cross-section
press forming
bond strength
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