US2028319A - Method of and means for producing bolts and the like - Google Patents

Description

Jan. 21, 1936. w. 1.. CLOUSE I 8,

METHOD OF AND MEANS FOR PRODUCING BOLTS AND THE LIKE Filed June 1, 1954 5 Sheets-Sheet l I WL. Zinuzntnr Jan. 21, 1936. w. L. CLOUSE 2,028,319

METH OD OF AND MEANS FOR PRODUCING BOLTS AND THE LIKE 'Filed June 1, 1934 5 Sheets-Sheet 2 lgig, 40

5.5 V P I i fqg Z6 1. Clause inucnmr 21v 1936' w. I... cLousE 2,028,31

METHOD OF AND MEANS FOR PRODUCING BOLTS AND THE LIKE Filed June l, 1934 5 Sheets-Sheet 3 Patented Jan. 21, 1936 UNITED STATES METHOD OF AND MEANS FOR PRODUCING BOLTS AND THE LIKE William L. Clouse, Tiffin, Ohio, assignor to National Machinery 00., Tiifin, Ohio Application June 1, 1934, Serial No. 728,607

7 Claims.

' This invention relates to a new and improved method of producing bolts and the like and to a mechanism for carrying out the method.

The invention is designed more particularly as an improvement upon inventions of the type disclosed, for example, in my Patent No. 1,929,- 184, issued to me on October 3, 1933. In said patent the blank is sheared off and transferred into line with a stationary die where the. metal is extruded by the action of. a ram or header.

In practice, however, it has been found desirable under some conditions to use separate gripping dies which cooperate to grip the blank, shear it from the stock. and then transfer it to position in front of the hole in the extrusion bush. Obviously where gripping dies are employed for this purpose it is. not possible to utilize an extrusion bush extending into the. gripping dies as shown in Figure 1 of my patent herein referred to. On the other hand if gripping dies are arranged to move across the face of the ex.- trusion die while carrying a blank into shaping position, the application of transverse pressure to the two gripping dies after the blank has been transferred, has generally resulted in the production of faulty articles. hasbeen due to the fact that followingshaping of the blank Within the extrusion bush and between the grip-ping dies, the pressure on the gripping dies has necessarily been removed in order to permit an ejector to expel the formed article. It has been found, however, that as. the gripping dies are relieved from pressure, the die remote from the toggleor' otherpressure producing. mechanism will tend. to expand or breathe, thereby thrusting laterally against. that portion of the formed article projecting from the. extrusion bush. Thus the article has been bent or scarred where it leaves the extrusion bush. with the result that many articles. produced in machines of this type have been rejected.

Recognizing the disadvantages resulting. from the breathing action of the compressed grip-- ping die when relieved from pressure, the present invention hasbeen devised for the purpose of eliminating bending, scarring orother objectionable characteristics while at the same time utilizing a movable gripping jaw because of the many.

the bending or scarring action which would result shouldthe extrusion bush be held firmly against movement.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts and in certain steps of the method hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts and in the disclosed method without departing from the spirit of the invention as claimed.

In the accompanying drawings several forms of the invention whereby the method maybe performed, have been illustrated.

In said drawings:

Figure 1 is a section through a portion of the bed frame of the machine showing the gripping dies under compression and holding a shaped blank prior to the release of pressure and the ejection of the blank.

FigureZ is a similar view showing a slightly modified form.

Figure 3 is a section showing another form wherein there is no operative cooperation between the bush and the gripping dies.

Figure. 4- is a modification of the structure shown in Figure 3, a combination extrusion and shear bush being yieldingly held for movement relative to the breast plate of the machine.

Figure5 shows a structure in which the extrusion and shear bushes are mounted within a stationary breast plate, means being employed for permitting movement of the extrusion bush to compensate for the breathing of the gripping dies.

Figure '6 is a section on line 6-6, Figure 5.

Figure 7 is a section showing another modification in which the gripping dies are not used for shearing the blank but are employed solely for the purpose of holding the blank properly alined with a yieldingly' restrained extrusion bush.

Referring to the figures by characters of reference, 'l designates a portion of the bed frame of the. machine which is recessed as at 2 for the reception of a breast plate 3. This breast plate, in the structure shown in Figure 1, is capable of a limited lateral movement, this being permitted in view of the fact that the recess is slightly wider than the breast plate therein. The breast plate is provided with an extrusion bush 4 and a shear bush 5, the latter being alined with a feed opening 6 through which stock S is supplied. An ejector pin P is mounted back in the extrusion bush and in order that this pin and the stock may not interfere with the lateral sliding movement of the breast plate in its recess 2, the openings in the bed frame and breast plate are made oversize.

Gripping dies 1 and 8 are slidably mounted upon the face of the breast plate and the ends of the bushes and the die 8 is connected to a toggle mechanism 9 or the like whereby during the movement of a rod I 0 in one direction said die will be shifted toward the opposite or dead side of the machine. However when the rod I0 is moved in the opposite direction the die 8 is drawn laterally from the position shown in Figure l.

A transfer plate I I is interposed between die I and the dead side of the bed frame and this transfer plate has a stem I2 slidable in the bed frame and engaged by a spring I3 which is constantly under tension. The transfer plate is of such thickness that when the two gripping dies 1 and 8 are under transverse compression, a blank B gripped therebetween will be held accurately positioned in front of the hole in the extrusion bush 4.

The slide I4 with which die 8 moves, has an extension l5 which laps one side of the breast plate 3 but is spaced therefrom. A spring I6 is adapted to receive thrust from this extension and transmit it to the breast plate.

In practice the die 8 is drawn laterally by shifting the toggle 9 out of the position shown in Figure 1. This movement of die 8 will release spring I3 and force die I to travel therewith until the two dies are brought into position in front of the shear bush 5 so that a length of stock can be fed from the shear bush and into position between dies 1 and 8. Following this operation the toggle 9 is actuated to shift dies 1 and 8 laterally against the action of the spring restrained transfer plate I I. As the gripping dies thus move the die 8 will shear the blank from the stock S and when the two dies are placed under maximum compression the spring IE will be holding breast plate 3 tightly against the far side of recess 2 and the blank will be accurately positioned in front of the extrusion bush 4. The heading tool I! will then be actuated to shape the metal in the extrusion bush and between the gripping dies. Following this shaping operation the toggle 9 is again actuated to relieve the gripping dies from transverse compression. Should the breast plate 3 be held immovably, the shaped blank, while seated in the dies would be distorted by the resultant breathing action of die I when relieved from compression. In the present instance, however, this breathing action of die I will cause the formed blank to move the breast plate 3 a sufiicient distance to compensate for the breathing action and the resistanceto this movement offered by spring I6 and the weight of breast plate 3 will not be suflicient to cause any injurious action upon the blank.

Furthermore the spring I3 is not of sufficient strength to cause injury by die I to the blank and, therefore, after the breast plate and die I have been moved the limited distance permitted by the clearance in recess 2 the ejector pin P can be brought into action to expel the article from the bush 4. It will be found that by mounting these parts so as to compensate for the breathing action of die I a well finished article free from all distortion or scarring will be produced by each operation.

Obviously the same results as those herein described can be accomplished by various modifications of the machine shown in Figure 1. For

example instead of providing a yielding thrust connection between the extension I5 of slide I4 and the plate 3, an adjustable thrust pin 20 can be carried by the extension for bearing against the breast plate 2 I, as shown in Figure 2.

In Figure 3 has been illustrated a structure in which the resilient restraint of the breast plate is maintained independently of the action of the slide 22 and the gripping jaws. In this structure the slide 2 differs from slide 24 in that it is not provided with an extension lapping one side of the breast plate but is adapted to move with the gripping jaws along one face of the breast plate. The recess 23 in which the breast plate 24 is mounted is slightly wider than the breast plate to provide a small clearance as shown at 25 and one wall of the recess has a socket 23 in which is located a spring 21 which thrusts constantly against the breast plate so as to hold it pressed normally against the far side of the recess. I

' The separate extrusion and shear bushes 28 and 29 respectively are. carried by the breast plate and when the gripping die 3!) breathes following its relief from compression, the formed blank 3 engaged thereby willshift the breast plate against the action of its spring 2'! so as to compensate for this breathing action.

If desired a combined extrusion and shear bush 33 can be mounted for limited sliding movement in a recess 34 formed in a fixedly held breast plate 35 as shown in Figure 4, a spring 36 being seated in the breast plate for holding the bush normally pressed against the remote side of the recess. Obviously in this form the bush 33 will move readily with the blank during the breathing action of the die 31.

In the form of the invention shown in Figures 5' and 6, the shear bush 38 is fixedly mounted in the breast plate 39 while the extrusion bush 40 is mounted for limited lateral sliding movement in a recess M in the breast plate. Springs M are located Where they will exert yielding pressure against the extrusion bush as shown in Figure 6. In this structure the extrusion bush will of course move with the blank during the breathing action of gripping die 42.

In all of the structures thus far described one of the gripping dies is used for the purpose of shearing off a blank and carrying it over into position in front of an extrusion die. It is not essential that such a structure be employed. This will be apparent by referring to Figure '7 wherein a stationary gripping die 43 cooperates with a movable gripping die 44, both dies being located in front of an extrusion die 45. The extrusion die is seated in a recess 46 slightly wider than the die sothat said die will have a limited sliding movement in one direction. A spring 41 is positioned to hold the extrusion die normally against movement. The extrusion die is so located that when the two gripping dies are under maximum transverse compression the held blank B will be accurately positioned relative to the extrusion die. However when the die 43 breathes during its release from compression, the engaged blank will cause the extrusion die to move therewith against the action of spring 47 so that there will be no bending or scarring of the blank due to the breathing action.

In the modification illustrated in Figure '7 the stock S is fed against a stop s while a suitable shear and carry-over C is employed for cutting off the blank and bringing it to proper position iln between the gripping dies and the heading tool In every form of the invention which has been described, the spring I3 associated with the transfer plate is of sufiicient strength to move the gripping die when relieved from pressure but is not strong enough to cause mutilation or distortion of an engaged blank by the spring pressed gripping die nor to interfere with the ejection of the blank.

What is claimed is:

1. A machine for pressing and shaping metal including an extrusion die having limitedrsliding movement, gripping dies for holding a blank in correct position relative to the extrusion die, means for holding the extrusion die in correct position to receive metal while being extruded, and means for shaping the metal within the dies thereby to provide means for transmitting motion from one of the gripping dies while breathing during its release from pressure, to the extrusion die.

2. A machine for pressing. and shaping metal including cooperating gripping dies, means for subjecting said dies to transverse compression while holding a blank, and an extrusion diecooperating with the gripping dies and movable to compensate for the breathing of one of the gripping dies while being relieved from compression.

parallel with the lines of force exerted through V the gripping dies, and adjustable means for holding the extrusion die against sliding movement while the gripping dies are under pressure, said adjustable means being shiftable by the release of pressure upon the gripping dies to permit movement of the extrusion die to compensate for the breathing of the gripping dies.

5. A machine for pressing and shaping metal including an extrusion die mounted for limited sliding movement, yielding means for holding the extrusion die normally in one extreme position, gripping dies, means for subjecting the gripping dies to transverse compression independently of the extrusion die to position the held blank correctly relative to the extrusion die while in its normal position, and means for shaping the blank within the extrusion and gripping dies whereby movement due to breathing of one of the gripping dies while being relieved from compression will be transmitted through the formed blank to the movable extrusion die.

6.. A machine for pressing and shaping metal including a breast plate mounted for limited sliding movement, yielding means for holding the breast plate normally in one extreme position, an extrusion die carried by the breast plate, gripping dies for holding a blank, means for subjecting the gripping dies to transverse compression thereby to grip the blank in correct position relative to I the normally positioned extrusion die, and means for shaping the blank within the gripping and extrusion dies thereby to transmit to the extrusion die and breast plate the movement of one of the gripping dies due to its breathing action while being relieved from compression.

7. A machine for pressing and shaping metal including blank gripping dies, and an extrusion die shiftable through a gripped blank by the breathing of the gripping dies.

WILLIAM L. CLOUSE.

Lil

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