US2412101A - Machine for piercing wiredrawing die units - Google Patents

Description

J. L. MY Rs 2,412,101

MACHINE FOR PIERCING WIRE DRAWING DIE UNITS Filed Dec. 6, 1943 Patented Dec. 3, 1946 MACHINE FOR PIERCING WIREDRAWING DIE UNIT-S John L. Smycrs; Fort Wayne, 1nd .a s s igno r to Ajax Industrial ,Supplies, -In c',, Fort Wayne, Ind., a corporation of Indiana Application December 6, 1943, Serial No. 513,201

This invention relates to improvements in machines for piercing wire drawing dies of that type wherein a refractory die body, such as a diamond, is established within a surrounding metallic encasement and subsequently bored to provide a die opening through the axis thereof tor the passage of wire'as in the usual wire-drawing operation.

In the usual practice, a die unit, constituted of a die body and its encasement, is disposed upon a spindle, and an arbor provided with a needle or nib is arranged in axial alinement with the unit and spindle, there being provided mechanism for rotating the spindle and arbor in opposie directions and for concurrently imparting axial reciprocating movement to the arbor. Generally, in such arrangements there is occasioned an impact between the nib and die body upon completion of each down stroke of the arbor whereupon the full weight of the arbor is suddenly imposed upon the nib causing it to buckle or spring out of true alinement with the common axis of the revolving parts.

Such unintended lateral play of the nib tends to cause enlargement of the bore as it is made in the die body and is detrimental especially when the bore required is of exceedingly small diameter and the nib necessarily slender. Such tendencies are aggravated as violence of the impacts increase which frequently cause inaccurate performance or fracture of the nib.

An object of the present invention is to afford in connection with a die-piercing machine having a revolving and axially movable spindle provided with a nib, and a die supporting spindle axiall alined with said arbor, a support for said arbor to yieldingly limit the stroke thereof, and means to create axial tremor of the arbor wherefore to lengthen the normal limited stroke of said arbor, thus to soften and increase the frequency of impacts between the nib and a die body disposed on said spindle.

Another object of the invention is to provide a die piercing machine by which to facilitate making of die openings through die bodies in such manner as to more accurately pierce the die body and materially reduce the time ordinarily required to penetrate it.

And a further object of the invention is to provide in a wire die piercing machine means whereby the impacts between the penetratin nib and the die body are softened and increased in frequency as compared with the common practice, wherefore .to attain accuracy and speed in performing the boring operation.

4 Claims. (o1. 1-25-,-3o

Other objects and advantages of the invention appear in the following description.

The above objects are accomplished by the construction shown in the accompanying drawing, in which:

Fig. 1 is a side elevational view of a machin in which the invention is incorporated, parts being in section; and

Fig. 2 is a top plan View of the arbor-supporting finger and a vibrator associated therewith, forming part of the machine.

The illustrative embodiment of the invention consists of a machine having a frame ,3 provided with alined bearings 4-5 in which is mounted an arbor .6 having rotary and axial movement therein and which is provided withmeans for rotation thereof, preferably consisting of a pull y 1 driven by a belt 8 actuated by any suitable means (not shown). The lower end of the arbor has in connection therewith a chuck 9 provided with .aneedle or nib ,lil thatrotates with the arbor upon a common axis.

In the base I l of the framers mounted a spindle i2 provided on its upper end with a face plate l3, and at its bottom with a pulley l4 actuated by a belt |5 connected with a suitable source of powerlnot shown). The spindle and the arbor are axially alined and preferably are rotated in opposite directions. 7

On the frameare provided brackets [,6 in which issupported a horizontalrshaft I1 thataffords pivotal, support for a lever or finger I8 the forward end of which is bifurcated and extends a-stridethe arbor 6 and upon which the pulley I bears and resists downward movement thereof.

On theframe 3 is mounted a guide IS in which is slidably mounted for vertical movement therein a carriage 2B the upper end of which has mounted therein a threaded post 2! provided with a lock nut fi by which the post is secured in adjusted positions relative to the carriage. The

upper end of the post has thereon a cushion 23, preferably made of rubber and which has contact with and yieldingly supports the finger 18 in a Upon the finger I8 is mounted a vibrator of any suitable construction, preferably consisting of an electric magnetic base 30 provided with an electrical coil 3| that is energized by alternating current supplied from any suitable source (not shown) through conductors 32-33. The base 30 has a core 34 that extends upwardly through the coil 3|, and disposed over the upper end of the core, suitably spaced therefrom, is a reed 35 supported at one end by a block 36 that has pivotal support as indicated by 31 upon the base 30. The block is provided with an adjusting screw 38 the inner end of which bears against the base, the arrangement being such that, by adjustably turning of the screw, the space between the reed 35 and the core 34 is varied. When the coil is energized the reed is magnetically attracted, thus im-.

parting to the finger more or less vertical vibratory movement which in turn causes vertical tremors of the arbor apart or in addition to the normal axial movement thereof occasioned by action of the carriage or adjustment of the post. The tremors'thus imparted cause elongation in the range of the normal stroke of the arbor permitted by yielding action of the cushion 23 with respect to the finger.

Operation In utilizing the invention the die unitto be pierced generally consists of a die body 39 provided with a reinforcing encasement 40, there being made in the unit axial cavities 4| in its top and bottom that extend through the encasement and partially into the die body made preliminary to the piercing operation. The unit is centered on the face-plate and secured thereon in axial alinement with the spindle and arbor by any suitable means, such as wax applied in the usual manner. The arbor is then lowered by adjustment of the post 2| while the carriage 20 is in its lowermost position, so the nib l closely approaches contact with the die body. Rotary motion is then imparted to the arbor and spindle, and the carriage is reciprocated vertically by the mechanisms therefor provided so that while the unit is revolved in one direction the nib is rotated in the'opposite direction and simultaneously is axially reciprocated through the medium of the carriage and the finger. When current is supplied through the conductors 32-33 the vibrator is energized causing the finger to tremble thereby creating vertical tremors of the arbor which receives support on the finger. The cushion 23 on the post yields more or less to the trembling action of the finger so that the downward stroke -of the arbor is correspondingly lengthened thus permitting the nib to have actual contact with the die body with penetrating effect. usual practice the operation is efiected by use of a fine abrasive dust accumulated in the region of the point of impact between the nib and die body.

As the tremors of the arbor are of high frequency the resultant impacts between the nib and die body cause corresponding rapid penetration of the nib through the body, its downward progress being controlled by manipulation of the post.

In making dies of small bore, such as are re quired for drawing very fine wire, it is essential that the thrust of the nib be gentle as the point 'of its impact with the die body isapproached in order to circumvent buckling or blunting of the: nib. In such instances reciprocation of the carriage maybe dispensed with by removal of the belt 29from the pulley 28 and turning AS in the 4 the shaft 26 so the cam 25 is in its lowermost position. The spindle 6 is then adjusted vertically to a selected position by turning the post 2| to move the finger so the nib closely approaches contact with the die body. Thus, when the vibrator is energized vertical tremors of the spindle created through the medium of the finger are more or less softened especially in the downward action of the spindle, by yielding of the cushion 23. Piercing of the die body by the nib is progressed as the post 21 is adjusted downwardly by the operator. The downward urge of the arbor is induced by the tremors of high frequency which are accompanied by correspondingly numerous impacts between the nib and the die body resulting in rapid penetrative effect as compared with the usual practice in which a longer and much slower stroke of the arbor is employed.

In the present invention the actual penetrating effect of the nib through the die body is ac-- complished by the lengthened portion of the down stroke of the arbor occasioned by the tremors thereof while the weight of the arbor is for the most part born by the finger while supported yieldingly on the cushion. In this manner the nib, upon each impact with the die body, is relieved of the weight of the arbor, which is a valuable feature of the invention.

Variations from the particular construction above disclosed may be resorted to by the exercise of skill in the art, without departure from the scope oi the invention, and the following claims are intended to be inclusive of such variations.

What I claim is:

1. In a machine for piercing wire drawing die units, an arbor mounted for rotation and axial movement provided with a nib, a spindle mounted for rotation axially alined with said arbor adapted to support a die unit to be pierced by said nib, a finger mounted for up and down move-' ment connectedly related with said arbor, a reciprocating carriage having an adjustable post thereon provided with a cushion engaging said finger to yieldingly limit the down stroke of said finger, a high frequency vibrator in connection with the finger wherefore to impart vertical tremors to the arbor thus to lengthen its axial movement, and means for actuating said carriage, arbor, spindle and the vibrator.

2. In a wire drawing die body piercing apparatus, a frame, a support on the frame for a die body to be pierced, an arbor mounted in said frame for rotation and axial reciprocating movement, having a nib to engage said body and provided with means to rotate said arbor, a pivoted finger having supporting relation with saidarbor provided with cushioned means to axially reciprocate said arbor, and a high frequency vibrator operatively associated with said finger by which high frequency tremors are concurrently superimposed upon the axial reciprocating movement of the arbor during engagement of the said body by the nib.

3. A piercing apparatus for wire drawing dies consisting of a die-body support mounted for rotation, an arbor provided with a nib, mounted for axial and angular movement and axially alined with said die-body support, a finger mounted for pivotal movement, having a yielding support and connected relation with said arbor adapted to restrain downstroke thereoL'a high frequency vibratory member in connection with said finger to cause axial tremor of said arbor concurrently with pivotal movement of said finger, and activating means for said die-body support, arbor and vibratory member.

4. A piercing apparatus for wire drawing dies consisting of a die-body support mounted for rotation, an arbor provided with a nib mounted for axial and angular movement and axially alined with said die-body support, a finger mounted for pivotal movement having supporting connection with said arbor, an adjustable 6 yielding support for said finger adapted to restrain the down-stroke of said finger and the arbor supported thereby, a high frequency vibrator on said finger adapted to cause tremor thereof concurrently with its pivotal movement during engagement of said nib with a die body placed on said support, and means to activate said diebody support, arbor and vibrator.

JOHN L. SMYERS.

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