US3058270A

US3058270A - Die holder for die conditioning machine

Info

Publication number: US3058270A
Application number: US111197A
Authority: US
Inventors: John E Brown; Harold A Osterberg
Original assignee: United States Steel Corp
Current assignee: United States Steel Corp
Priority date: 1961-05-19
Filing date: 1961-05-19
Publication date: 1962-10-16
Anticipated expiration: 1979-10-16

Description

Oct. 16, 1962 J. E. BROWN ETAI. 3,958,270

DIE HOLDER FOR DIE CONDITIONING MACHINE Filed May 19, 1961 Q PIE- 1. a" 6 2 0 1r E 56 y j 26 24 34 28 H- 3 l2 Q a l8 l/ I9 INVENTORS JOHN E. BROWN and HAROLD .4. OSTERBERG Aflorney ttes The present invention relates generally to die conditioning apparatus and more particularly has as its primary object the provision of an improved die holder assembly for supporting a wire-drawing die for ripping or lapping in a die conditioning machine.

Another object of the invention is to provide a wiredrawing die holder assembly wherein a die receptacle is mounted on and is provided with a driving connection with a rotatable platform so that a die to be conditioned can be positively rotated relative to the lapping pin of a die lapping machine.

It is another object of the invention to provide a wire-drawing die holder assembly of the foregoing character wherein the die receptacle is mounted on the rotatable platform in such a manner to permit limited shifting of the receptacle during the conditioning process so as to effect self-centering of a die held in the receptacle relative to the longitudinal axis of the lapping plIl.

It is a further object of the invention to provide a wire-drawing die holder assembly which includes a receptacle comprised of a pair of separate spaced apart segments having matching semi-circular recesses therein which form a socket for receiving a die and which segments are held in engagement with the die by means of a resilient band extending around the annular peripheries of the segments.

It is a further object of the invention to provide a wire-drawing die holder assembly of the foregoing character wherein the driving connection between the platform and the die receptacle is effected by means of a lug projecting upwardly from the platform and a slot in the bottom of the receptacle in which the lug is received.

As a corollary to the object immediately above, it is a further object of the invention to provide a wire-drawing die holder assembly of the foregoing character in which aligned grooves are formed in the outer annular walls of the segments coplanar with the slot in the bottom of the receptacle and the resilient band is disposed in the aligned grooves whereby the band limits movement of the receptacle axially of the lug and also maintains the segments in engagement with the die.

These and other objects will become more apparent after referring to the following specification and attached drawings in which:

FIGURE 1 is an elevational view partly in vertical section; and

FIGURE 2 is a plan view taken on the line 11-11 of FIGURE 1 with parts broken away to show underlying structure.

Referring more particularly to the drawings reference numeral 2 designates generally the wire-drawing die holder assembly of the invention shown mounted in the frame 4 of a die lapping machine for supporting a wiredrawing die D in position for conditioning by a lapping pin 6 of the lapping machine.

The die holder assembly of the invention includes a platform 7 which is preferably in the form of a horizontally disposed worm gear 8 having a recessed upper face into which is fitted a drive plate 10. The drive plate 10 which is provided with a center hole 20 is fixedly mounted in the recessed upper face of the gear fififhlffi Patented Oct. 16, 1962 8 by means of a pair of countersunk screws 12. The gear 8 is rigidly fitted on the end of a hollow shaft 14 which depends from the gear and extends through a bushing 16 in the frame 4. The upper portion 18 of the bushing 16 is flanged and serves as a bearing for the gear 8. The upper end of the hollow shaft 14 is flush with the bottom of the recess in the upper face of the gear 8. Worm gear 8 is in mesh with and driven by a worm 19 which is fixedly mounted on a drive shaft 21 connected with suitable power means (not shown).

A pair of aligned, diametrically extending lugs 22 project upwardly from the upper surface of the plate 10 and extend radially from opposite sides of the hole 20, as best shown in FIGURE 2.

The die receptacle 24 of the assembly consists of two semi-circular recessed segments 26 which define a socket 28 for receiving the wire-drawing die D. The segments are held in engagement with the die by means of tWo tension-spring rings 30 and 32 which are received in

grooves

34 and 36, respectively, located in the outer annular walls of the segments 26. It will be noted that the inside diameter of the socket 28 is equal to the diameter of the die D, however, the segments are not complete semi-circles and, therefore, when the segments are in position around the die, a diametrically extending slot 38 is formed between the adjacent bottom edges of the segments. Slot 38 receives the lugs 22 of drive plate 10 to :form a driving connection between gear 8 and the receptacle 24. The slot 38 has a width greater than the thickness of the lugs 22 so as to permit the die receptacle to shift laterally a slight amount relative to the lugs. Such spacing to permit a slight amount of lateral movement between the die and the lapping pin is necessary to render the die self-centering so as to compensate for wear of machine parts which otherwise would result in throwing the axis of the lapping pin off-center relative to the axis of the platform and die receptacle.

The receptacle 24 has a center opening 40 through the bottom thereof which is aligned with and communicates with the center hole 20 of the drive plate It) and the bore of shaft 14 so as to render the assembly of the invention self-cleaning.

In operation, the platform 7 is rotated at a relatively slow speed while the lapping pin 6, which is supported from above, is rotated at a relatively high speed, usually in the direction of rotation opposite to the direction of rotation of the platform. During the die conditioning operation the lapping pin is caused to reciprocate axially while it is rotating. The mechanism for rotating and reciprocating the lapping pin is well known in the art and is not shown herein. A typical example of such mechanism is shown by Patent No. 2,465,867 issued March 29, 1949.

While one embodiment of our invention has been shown and described it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.

We claim:

1. A wire-drawing die holder assembly for a die lapping machine which comprises a rotatable platform, means connected with said platform for rotating the same, a diametrically extending lug projecting upwardly from the surface of said platform, a die receptacle loosely mounted on said platform, said receptacle having a diametrically extending slot on the bottom thereof for receiving said lug, said slot having a width greater than the thickness of said lug whereby said receptacle is shiftable laterally relative to the longitudinal axis of said lug. s

2. A wire-drawing die holder assembly for a die lapa ping machine which comprises a rotatable platform, means connected with said platform for rotating the same, an elongated central lug projecting upwardly from said platform, a die receptacle loosely mounted on said platform, said receptacle including a pair of spaced apart segments having matching semi-circular recesses therein defining a socket for receiving a Wire-drawing die, the adjacent bottom edges of said segments defining a slot therebetween for receiving said lug, the width of said slot being greater than the thickness: of said lug whereby said receptacle is shiftable laterally relative to said lug, and securing means disposed around said segments to hold the same together around a wire-drawing die.

3. A wire-drawing die holder assembly as defined by claim 2 in which each of said segments has a peripheral groove therein, the peripheral groove in One segment being *aligned with the peripheral groove in the other, and said securing means comprises a resilient band seated in said peripheral grooves.

4. A Wire-drawing die holder assembly as defined -by claim 3 in which said peripheral grooves and the resilient band received therein are co-planar with said lug whereby motion of said receptacle axially of said lug is limited by said resilient band.

5. A wire-drawing die holder assembly as defined 'by claim 2 in which said platform and said socket have aligned center openings therethrough adapted to communicate with the opening of 'a wire-drawing die received in said socket.

6. A wire-drawing die holder assembly as defined lay claim 5 in which said platform includes a substantially horizontally disposed worm gear, and said rotating means comprises a Worm in mesh with said Worm gear.

References Cited in the file of this patent UNITED STATES PATENTS 1,578,163 Muehlieb Mar. 23, 1926 2,412,101 Srnyers Dec. 3, 1946 2,465,867 Gargano Mar. 29, 1949 2,591,298 Roux Apr. 1, 1952 2,835,496 Hall May 20, 1958