US2266432A - Method of die casting heads on pins - Google Patents

Description

Dec. 16, 1941. 1.. H. MORIN ETAL 2,266,432

METHOD OF DIE CASTING HEADS ON PINS Filed Feb. 28, 1939 INVENTOR zmwwmew/wwxr dd/J HMO/Pl ATTORNEY Patented Dec. 16, 1941 METHOD OF DIE CASTING HEADS ON PINS Louis B. Morin and Davis Marinsky, Bronx, N. Y., assignors to Whitehall Patents Corporation, Bronx, N. Y., a corporation or New York Application February 28, 1939, Serial No. 258,928

9 Claims.

This invention relates to the method of die casting heads or bodies upon pins and like members, and more particularly to a method wherein a series of successive pins are arranged upon an elongated supporting strip or tape and fed thereby into position between relatively movable dies to expose a portion 01' the pin within the impression or mold cavity of the dies and in pressure feeding heated casting material into the impression to form on that part of the pin arranged therein, the head or other body; and then in trimming the casting just formed to produce a finished casting on the pins successively moved into casting position. The invention further relates to the method of forming heads or bodies of two differently colored thermoplastic materials upon the pins. The novel steps of the I method will be best understood from the following description when taken together with the accompanying drawing in which certain embodiments of the invention are diagrammatically disclosed, and in which the separate parts are designated by suitable reference characters in each of the views. and in which:

Fig. 1 is a diagrammatic view illustrating a part of a pin supporting strip and showing the method of bringing successive pins on the strip in registering position between relatively movable dies in forming heads on said pins.

Fig. 2 is a sectional view substantially on the line 2-2 of Fig. 1.

Fig. 3 is an enlarged diagrammatic view substantially similar to that shown in Fig. 1, but omitting parts 01' the construction and showing another adaptation of the invention.

Fig. 4 is a view showing several difierent types of heads and pin constructions.

Fig. 5 is a perspective view of a modified form of part 01' a complete head made according to the method shown in Fig. 3; and, Fig. 6 is a view similar to Fig. 5 showing the completion of the head.

Figs. 1 and 2 of the drawing show one adaptation of the invention and in these figures a diagrammatic illustration is shown of the method of forming a single unitary die cast body, for example, a head upon a pin, rod or other mounting member. In carrying this method into effect, an elongated flexible strip l of paper or any other suitable material is provided and to this strip or conveyor member is -attached at regularly spaced intervals a series of pins or other mountings ll, one end of the pins being enlarged or provided with anchor portions I2; whereas the other end II is pointed. The member transversely spaced keepers It for supporting the pins in connection therewith. At [5 is shown relatively movable dies of a die casting machine, adjacent surfaces of the dies being recessed to form a mold cavity or impression it of any desired form or contour, so long as the contour will permit ejection of the resulting cast body or head 11 formed by the injection of heated casting material into the impression I! through a gate or admission orifice lBa on the parting line it of the dies. The material is injected through a nozzle l9, indicated in Fig. 1 oi. the drawing, which will be timely moved into registering position with the gate orifice lid; and in like manner, a timely pressure discharge of the casting material will be forced from the nozzle into the impression l8.

It is also desirable in some instances to arrange a pin 20 on the parting line of the dies so as to enter the gate passage I to facilitate ejection of the casting from the dies I5 in the separation thereof. However, in some instances, the pins It! will be of sumcient strength and suitably supported to serve for this purpose.

At this time it is also pointed out that in some instances the shape or contour of the orifice |6a will be such that the resulting gate 2| trimmed from the body I! by a knife or other trimming tool 22 will be of a contour to form another article. For example, a button may be so formed. This is, of course, by no means essential. However, in forming another article, the core 20 serves as the means to control the shaping thereof.

Suitable means such as guide shoes or channels 23, 24, will be employed to guide the pins Ii, into and between the dies l5 so as to bring the enlarged ends l2 in proper registering position with the impression it. It will also be apparent that suitable means will be provided to guide the mounting strip or tape ID from a roll Illa, note Fig. 2, into position to pass between the guides 23. .The pin 20 may be used as the feeding and spacing means, it being understood that after one casting is formed, it is fed by the pin into a position adjacent the lower surface oi! the dies when the dies are in a fully open position, after which the dies are partially closed and the casting is stripped from the pin, leaving the casting supported upon .the lower surface of the dies. This spacing between the cast position and the position upon the lower surface of the dies represents equal spacing of the pin II as will readily appear. When the ejector and feed pin 20 is it is provided with not employed, other means will be provided controlling the feed of the tape Hi to bring successive pins in proper registering alinement with the impression.

It will, of course, be apparent that the pins II are movable vertically between the adjacent surfaces of the dies when in open position and normally moved on the parting line of said dies. It will be apparent that the strip or tape Ill may constitute a permanent part of the resulting product; that is to say, the pin with the die cast heads thereon may be sold in the'strip form of any given length or with any desired number of pins on a strip or sheet, depending entirely upon the manner of selling or using the same. The die cast heads may be formed from any suitable die cast material including the various metals or metal alloys as well as thermoplastic materials, such for example as cellulose acetate. In,the latter instance, a dual nozzle construction may be employed, such as diagrammatically illustrated in Fig. 3 of the drawing, with the nozzles arranged horizontally rather than vertically so that each nozzle may be moved into registering alinement with the gate l6a in forming any desired series of difierent colored thermoplastic castings on the pins, To give one illustration of the many possible arrangements of two color castings, it will appear that every two successive castings may be in one color and the next successive one, two, or any other number of castings, may be another color. This operation is repeated throughout the continuous operation of forming intermittently the successive series of castings at a relatively high speed.

Considering Fig. 4 of the drawing it will appear' that any desired shape or form of casting may be arranged upon the pins. For example at Ila is shown the pin having a square head 11a.

At ilb is shown a pin having a disc-type head iib; whereas at Me is shown a pin having an offset l2 instead of the enlargement l2 shown in Fig. 1 with a spherical head He arranged thereon. Here it must be pointed out that the illustrations are merely suggestions of the many types of heads or enlarged bodies that can be formed upon th'e pins or other mounting members. In view of the fact that very flne definitions can be produced in pressure die castings oi the type and kind under consideration, the heads may be engraved or characterized in any manner which will enable the castings ejected from the dies which are employed.

In Fig. 3 of the drawing, another adaptation of the invention is shown which is applicable primari y to the casting of thermoplastic materials, such for example as cellulose acetate; and in this figure is diagrammatically illustrated at Ifla a part of a pin conveying or feed tape or member similar to the member l6, upon which pins ild similar to the pins H are arranged and guided in the same manner between relatively movable dies 25. The dies are provided on adjacent surfaces thereof with two independent impressions 26 and 21, which are spaced apart a distance equal to the spacing of the pins ild, the impression 26 having a gate orifice 28 leading thereto on the parting line of the die; whereas the impression 21 has a gate orifice 29 leading thereto. The orifice 28 enters the impression 26 at the lower edge of the impression as pictured in Fig. 3; whereas the orifice 29 enters the impression 21 centrally of the outer edge thereof so that when the part casting 30 is moved from the impression 26 into the impression 21, the gate portion 30a of said part casting will be arranged in an auxiliary orifice 28a and blue casting material 34, in the illustration given, into the impressions 26, 21. The cast body 30 will be cast in a red thermoplastic material and will have a dovetail key member 35 on the outer surface thereof; whereas the cast body 36 of the blue thermoplastic material will be formed around the dovetail coupling 35 in the impression 21, so that the resulting head will be composed of the two cast bodies 30, 36, the body 36 having a gate 36a. The gates 39a, 36a are trimmed on by angularly arranged and operating knifes or trimming tools 31, 38, when the complete casting is disposed upon the lower surface 25a of the dies, as seen in Fig. 3 of the drawing. This surface is so spaced with respect to the impression 21 as to be equal to the spacing of the pins lid. In other words, when an ejector pin 39, on which the gates 39a, 3612 are formed, is moved downwardly, the gate 30a will be moved into registering position with the passage 28a, and the gate 36a will be moved into position to engage the surface 25a as seen in the drawing.

It will be understood that the pin 39 is stripped from the gates 30a, 36a, and returned to its raised position intermediate successive casting operations and while the dies are in a partly open position. Here again. it will be understood that in some instances, the feed and ejector pin 39 need not be employed, and the pins Hd may be used for this purpose as well as to properly feed the castings through the stages of successive operations.

It is believed that the method disclosed in Fig. 3 will be quite clear from the foregoing description. However, it will be understood that the cycle of operation is as iollows: A pin l Id is first moved to dispose the enlarged portion at one end thereof within the impression 26; it being understood that in the initial operation means will be provided to plug a pin receiving aperture opening into the impression 31. In the first injeotionof heated thermoplastic material, a casting, such as 30, including the dovetail key element 35, will be formed in the impression 26. The pin with this partially formed head is then moved into the impression 21 which is shaped to receive the head operation, the first completely formed casting is moved into position adjacent the lower surface 25a of the dies, and when in this position, and in performing the next casting operation, the gates 30a, 36a, are trimmed off by the knives 31, 38. The angular arrangement of these knives is to clear the castings to permit the same to feed into a suitable receiver arranged below the dies.

In Figs. 5 and 6 of the drawing is shown one of many adaptations of the method as disclosed in Fig. 3, for example in making a first casting 40, equivalent to the casting 30, instead of forming a dovetail member 35, a member 4| in the form of a letter T will be cast so that when the second cast body 62 equivalent to the body 36 is formed,

the T will be disposed through the front surface of the cast body 42. In this arrangement it will, of course, be apparent that the gate orifice 29 will be spaced so as to clear the surface of the T. There is no apparent need of attempting to mention the many possible adaptations of the method shown in Fig. 3, which not only consists in the casting of heads or enlarged bodies of two different colors, butalso in the many different possible shapings of the bodies formed by different colored cast materials.

With thermoplastic materials of the type and kind under consideration, it is also possible to mix or blend two or more different colored materials in each of the cylinders Ma, Ma, leading to the discharge nozzles. Thus each body or cast portion of the resulting unitary casting may not only be of different colors, but of different combinations of multi-colors, or multi-colors in one cast portion and a solid color in the other cast portion.

It will, of course, be understood that the various casting materials employed are heated and discharged in accordance with processes which are now well known in the art. Therefore, no specific mention need here be made.

It will also be apparent that the invention as herein illustrated has been associated with pins, but the invention is applicable to the die casting of bodies of single or two color casting materials upon mounting members of any type or kind, intermittently moved into position within the impression'or mold cavity of relatively movable dies, and in the provision of means for feeding and guiding said members with respect to the dies. It will also be understood that in some instances the pins need not necessarily be mounting members, but merely other forms of core pinsnipon which the individually cast parts are formed in the manner taught in Fig. 3 of the drawing, this being the case Where it is desired simply to produce unitary cast bodies composed of the cast parts. In fact, the same principle may be applied to the teachings in Figs. 1 and 2 of the drawing. In both instances, the other core pins need not necessarily be employed.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent, is:

l. The herein described method of forming die cast bodies on one end of an elongated member, which consists in first die casting one body on said end of the member with an anchor or keying portion on one surface of said body, then die casting another body of different characteristics on the first named body to engage the keying portion thereof to form on the resulting member an enlarged head composed of both of said cast bodies.

2. The herein described method of forming die cast bodies on one end of an elongated member, which consists in first die casting one body on said end of the member with an anchor or keying portion on one surface of said body, then die cast" ing another body of different characteristics on the first named body to engage the keying portion thereof to form on the resulting member an enlarged head composed of both of said cast bodies, and so casting one of said bodies as to expose a part thereof through an outer surface of the other of said bodies.

ing portion on one surface of said body, then die casting another body of different characteristics on the first named body to engage the keying portion thereof to form on the resulting member an enlarged head composed of both of said cast bodies, and forming the two cast bodies simultaneously in successive die casting operations upon independent members by the simultaneous pressure injection of casting material into independ ent impressions of relatively-movable dies.

4. The herein described method of forming two die cast bodies upon a mounting member which consists in moving toward and from each other dies having pairs of spaced impressions upon adjacent surfaces thereof, one pair of impressions defining a small mold chamber and gate passage, the other pair of impressions defining a larger mold chamber and a second gate passage, and at least part of said large mold chamber having the same configuration as part of said first named chamber and passage, moving successive members relatively to the dies along the parting line thereof to bring each member into registering position with each impression, closing the dies around parts of said members, and injecting heated casting material simultaneously from two sources of supply into the separate impressions of the closed dies to form individual cast bodies therein and upon said independent members extending into each impression.

5. The herein described method of forming two die cast bodies upon a mounting member which consists in moving toward and from each other dies having pairs of spaced impressions upon adjacent surfaces thereof, one pair of impressions defining a small mold chamber and gate passage, the other pair of impressions defining a' larger mold chamber and a second gate passage, and at least part of said large mold chamber having the same configuration as part of said first named chamber and passage, moving successive members relatively to the dies along the parting line thereof to bring each member into registering position with each impression, closing the dies around parts of said members, injecting heated casting material simultaneously from two sources of supply into the separate impressions of the closed dies to form individual cast bodies therein and upon said independent members extending into each impression, and moving the members by means of a movable core extending through said first named gate passage and into said second named gate passage.

6. The herein described method of forming two die cast bodies upon a mounting member which consists in moving toward and from each other dies having pairs of spaced impressions upon adjacent surfaces thereof, one pair of impressions defining a small mold chamber and gate passage, the other pair of impressions defining a larger mold chamber and a second gate passage, and at least part of said large mold chamber having the same configuration as part of said first named chamber and passage, moving successive members relatively to the dies along the parting line thereof to bring each member into registering position with each impression, closing the diesaround parts of said members, and injecting heated casting material simultaneously from two sources of supply into 3. The herein described method of forming div "the separate impressions of the closed dies to cast bodies on one end of an elongated member, which consists in first die casting one body on 'form individual cast bodies therein and upon said independent members extending into each said end of the member with an anchor or key impression. Supporting each dual cast y 011 its mounting member outwardly of the dies and trimming the gates therefrom during the casting of the next successive bodies.

'7. The herein described method of formin a series of similar multiple colored thermoplastic die cast bodies on end portions of elongated members, which-comprises moving dies having pairs of impressions forming spaced mold chambers and gate passages therein toward and from each other, arranging elongated members so that part of successive members extend into adjacent mold chambers, intermittently moving said members a distance equal to the spacing between said members to position the parts thereof in the mold chambers when the dies are closed, and

, simultaneously injecting different colored casting materials through said gate passages to form a casting in the first mold chamber directly upon the member arranged therein, and to form in the next adjacent mold chamber a casting arranged upon the previously formed casting from said first named chamber.

8. The herein described method of forming two die cast bodies upon a mounting member which consists in moving toward and from each other dies having pairs of spaced impressions upon adjacent surfaces thereof, one pair of impressions defining a small mold chamber and gate passage, the other pair of impressions defining a large mold chamber and a second gate passage, and at least part of said large mold chamber having the same configuration as part of said first named chamber and passage, moving successive members relatively to the (lies along the parting line thereof to bring each member into registering position with each impression, closing the dies around parts of said members, injecting heated casting material simultaneously from two sources of supply into the separate impressions of the closed dies to form individual cast bodies therein and upon said independent members extending into. each impression, providing for proper spacing of said members by attaching the same to an elongated support and conveyor and intermittently feeding the conveyor between successive casting operations to continuously feed said members relatively to said dies.

9. The herein described method of forming multiple colored thermoplastic die cast bodies which consists in moving toward and from each other dies having pairs of impressions in abutting surfaces thereof forming spaced mold chambers and gate passages, passing a mounting member having equally spaced projecting parts relatively to said dies to dispose said spaced parts thereof within said mold chambers, simultaneously injecting diflerent colored casting materials into said mold chambers to form a casting in one mold chamber directly upon one of said parts and a casting in the adjacent mold chamber arranged upon an adjacent part including a previously formed casting from said first named chamber, intermittently feeding said mounting member and castings through a distance equal to the spacing of said chambers and projecting parts by means of a movable core pin passing through the gate passage of said first named chamber and extending into the gate passage of the second named chamber, supporting each dual-cast body against a recessed outer surface of the dies during the casting of next successive bodies, and trimming the gate portions from said dual body while supported in said position.

LOUIS H. MORIN. DAVIS MARINSKY.

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