Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1984-05-10
1985-12-24
Gilden, Leon
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72358, 72359, B21D 4500
Patent
active
045598037
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the manufacture of hollow articles. The invention has been developed for the manufacture of the outer member of a constant velocity universal joint of the cross-groove type. In such a joint, there is an inner member and an outer member each of which is grooved and there are two sets of helical grooves in each member, the grooves of the two sets being on helices of opposite hand. Balls are engaged in the grooves and are held in a cage and because of the crossed configuration of the grooves the balls are held in the bisector plane of the joint as the parts of the joint articulate.
Although the invention has been developed for making outer members for such cross-groove constant velocity joints it is applicable generally to the manufacture of hollow articles of the type, hereinafter referred to as being of the type specified, having at least two grooves in the bore thereof, the grooves having longitudinal axes of symmetry (as hereinafter defined) which differ (as hereinafter defined) The article may have at least two sets of grooves with the grooves in each set being spaced round the longitudinal axis of the bore and having longitudinal axes of symmetry which are the same (as hereinafter defined), the longitudinal axes of symmetry of the grooves in one set being different from the longitudinal axes of symmetry of the grooves in the other set.
By longitudinal axis of symmetry of a groove we mean the imaginary line which is equally spaced from the edges of the groove and which lies in an imaginary surface forming a continuation of the bore surface and containing said edges.
When we say that the longitudinal axes of symmetry are the same we mean that the loci of points moving in synchronism from the one ends of said axes to the other bear a fixed relation to one another. Conversely, when we say that the longitudinal axes of symmetry differ we mean that the loci of such moving points do not lie in a fixed relation to one another. Thus, for example, the axes could be on helices of different hand, or of the same hand and different pitch or on helices of different pitch and hand. Some of the axes could be straight and others could be helical.
Presently in the manufacture of outer members for cross-groove constant velocity joints the blanks are made by forging, extrusion or some other metal forming method and the grooves are then machined in the bore. Such machining operations are expensive in time and equipment besides removing material. It would be convenient to be able to form the grooves in the bore without removal of metal or even to make them with imprecise grooves which would require less machining than at present. However since the longitudinal axes of symmetry of the grooves differ as defined above a one-piece tool could not be removed from the bore after the grooves had been formed.
It is an object of one aspect of the invention to provide a tool for making hollow articles of the type specified and particularly for making outer members of constant velocity joints in which machining of the grooves may be reduced or eliminated.
According to this aspect of the invention we provide a tool for use in making a hollow article of the type specified by forming the material of the article about the tool and subsequently withdrawing the tool, the tool comprising first and second parts which are mounted so as to be capable of relative movement parallel to and about a tool axis (which when the tool is in use will be coincident with the longitudinal axis of the bore in the article) so as to bring portions of the parts into and out of mutual intercalation, each of said portions carrying at least one projection to form a groove, each groove which is formed by a projection on the first part having a longitudinal axis of symmetry which differs (as hereinbefore defined) from the longitudinal axis of symmetry of the or each groove formed by a projection on the second part and wherein, if a portion has more than one projection thereon, the projections on the portion are arranged to form grooves whose lo
REFERENCES:
patent: 3842646 (1974-10-01), Kuhn
patent: 4317356 (1982-03-01), Stell
patent: 4406146 (1983-09-01), Suzuki
James Stephen R.
Langford Edward A.
Neale Reginald L.
Gilden Leon
PFD Limited
LandOfFree
Tool for making hollow articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tool for making hollow articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tool for making hollow articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1472580