MXPA96003674A - Unified appliance for supply of lubricant, mounted in a troq - Google Patents

Abstract

The present invention relates to an apparatus for the supply of a unified lubricant, for a die-casting machine having a stationary die and a movable die forming a pair of dies defining, when closed, a removable die cavity. in a line of separation between the dies, the movable die can be moved to and from the stationary die for closed and open positions of the pair of dies, and injection means for supplying molten molten metal, under pressure, to the die cavity to form a press-molded product, the apparatus is characterized in that it comprises: a supply cylinder mounted in one of the dies, but separated from the injection means, the supply cylinder has an inner end and an outer end, the inner end, in the open position of the die is open for external access, and, in the closed position of the die, is oriented towards the wall of another of the dies and connects the cavity through a restricted conduit between the dies, a solid piston or rod with reciprocating or reciprocable movement in the cylinder, between an advanced or advanced position near the inner end of the cylinder, and a position retracted, separated away from the inner end, and means for driving the solid piston between the retracted and advanced positions to crush a lubricating element unified in the cylinder against the other die wall and drive the lubricant through the restricted conduit towards the interior of the cavity

Description

UNIFIED APPARATUS FOR SUPPLYING LUBRICANT, MOUNTED INTO A TUBE DESCRIPTION DB THE INVENTION This invention relates to the lubrication of die-casting machines, and more particularly to an apparatus for lubricating a die cavity by using a unified or packaged lubricant. For many years, a principal method for applying lubricants or die release agents to the surfaces of a die for die casting has been through the spraying of a liquid that conveys a lubricant onto the surfaces of the die cavity when the of dies are open. More recently, various forms of mechanisms or lubrication apparatuses have been proposed for use in conjunction with die-casting machines. These have included devices for introducing various forms of bulk lubricants into the die cavity or a die-casting die sleeve of the die-casting machine, as well as the application of a meltable lubricant within the cycle sleeve. of molding to supply it to the die surfaces together with the molded metal REF: 22922 cast. However, a suitable apparatus for providing die lubrication with a flowable, block or packed lubricant, unified to a piston or to be forced into the die cavity or in the molding cycle sleeve before introduction is still to be described. of metal. The present invention provides an apparatus for use in conjunction with die-casting machines, which is operative to supply lubricant of unified blocks or lubricant containers to a die cavity of an associated die-casting machine. In certain specific embodiments, the apparatus may include a cylinder mounted in one of two dies and an opposite end wall carried by the other die. For example, the cylinder can be mounted on an insert in a movable ejector die and coincide with an end wall mounted on an insert in an associated stationary cover die. The cylinder can be placed generally horizontal and parallel with the line of division of the pair of associated dies. An upward filling opening can be provided through which a unified lubricating element can be inserted between the ends of the cylinder when the dies are open. Alternatively, a lubricant element can be inserted through an opening element of the cylinder. When the dies are closed, the end of the cylinder is closed by a wall in the cover die, except for a restricted conduit which connects to the cavity of the die. A solid piston or rod in the cylinder is driven by means such as a directly connected drive cylinder, a rack and pinion mechanism or a cam actuator. The unified lubricant elements which are usable for the delivery apparatus may include packaged lubricants or in containers or containers including liquid or semi-solid lubricants (such as solid / liquid compounds) sealed in a container. The container is broken by pressing it with the solid piston against the closed end of the cylinder and by pressing the lubricant through the restricted conduit into the die cavity. A block of lubricant can be used in a container (containerizer), which can flow under pressure. Further details of the unified lubricating elements which can be used for an apparatus for lubricating dies, according to the invention, are set forth in the co-pending U.S. patent application Serial No. 03003,032 filed with the same date as this request.

Alternative forms of a unified lubricant delivery apparatus may include arrangements in which a cylinder is mounted on or within the mobile die, for example, and that are generally placed normal to the line of separation of the pair of dies. The inner end of the cylinder is closed by a wall of the stationary punch, when the dies are closed, with a restricted connection to the cavity of the punch. The opening of the dies exposes the inner end of the cylinder for the insertion of a unified lubricant and, if necessary, the extraction or removal of a previously crushed lubricant container. In the other forms, the structure and operation may be generally similar to the arrangements or arrangements previously described. These and other features and advantages of the invention will be more fully understood from the following description of certain exemplary embodiments of the invention taken in conjunction with the accompanying drawings: In the drawings: Figure 1 is a schematic cross-sectional view die-press die molding machine including one embodiment of the unified lubricant delivery apparatus according to the invention and showing the dies in closed position, - figure 2 is a view similar to that of figure l, but showing the dies in an open position, - Figure 3 is a fragmentary, cross-sectional view from the plane of line 3-3 of Figure 1 showing the structure of the unified lubricant supply apparatus mounted within the pair of dies; Figure 4 is a front view of the ejector die from the plane of line 4-4 of Figure 2, which further illustrates the delivery apparatus; Figure 5 is a cross-sectional view from line 5-5 of Figure 4; Figure 6 is a cross-sectional view from line 6-6 of Figure 4; Figure 7 is a bottom view of a modified form of the lubricant supply apparatus mounted within a pair of dies; Figure 8 is a front view, similar to that of Figure 4, but showing the delivery apparatus of the embodiment of Figure 7; Figure 9 is a fragmentary, cross-sectional view through the opening of the cylinder fill from the plane of line 9-9 of Figure 8; Figure 10 is a semi-schematic cross-sectional view of a die-casting machine that includes an alternative embodiment of the unified lubricant delivery apparatus and showing the dies in a closed position; Figure 11 is a view similar to that of Figure 10, but showing the dies in an open position; Figure 12 is an enlarged cross-sectional view illustrating portions of the lubricant supply apparatus shown in Figure 10; Figure 13 is a cross-sectional view similar to the cover die portion of Figure 12 but showing an alternative cover die insert; Fig. 14 is a cross-sectional view similar to that of Fig. 12, but showing a rack and pinion mechanism for the solid piston; Fig. 15 is a side view showing the external portions of the mechanism of Fig. 12 including an arrangement or arrangement of pivot arm for driving the pinion; Fig. 16 is a schematic side view illustrating an alternative mechanism arrangement including a rack for driving the pinion, and Fig. 17 is a cross-sectional view, similar to that of Fig. 14, but showing an arrangement of cam driven by a cylinder to drive the solid piston. Referring first to Figures 1 to 6, of the drawings, in greater detail, the number 10 generally indicates a die-casting machine having a stationary cover die 12 and a mobile ejector die 14. When closed, the dies define an internal die cavity 16 defined by opposing walls of dies that include a recess in at least one die. The opposing die walls are generally removable along the separation line 18. Within the stationary die 12, a molding cycle sleeve 20 extends through an open internal end 22 in the separation line 18. The molding cycle sleeve extends outwardly from the stationary die towards an opposite end near which a filling opening 24 is provided to admit a load of molten metal for die casting during the operation of the die-casting machine . A piston or plunger 26 reciprocates or reciprocates within the molding cycle sleeve to drive the molten molten metal under pressure into the die cavity 16. When the dies are closed, as in Figure 1, a wall 28 of the movable die closes the inner end 22 of the molding cycle sleeve, except for a cavity and gate which forms a restricted conduit 30 connecting the inside of the sleeve of the molding cycle. molding cycle with the die cavity 16. When the dies are opened, as shown in Figure 2, the inner end of the molding cycle sleeve also opens by movement of the wall 28 when it moves away from the end 22. In the illustrated embodiment, the press molding machine The conventional die described heretofore is modified by providing an apparatus 32 for delivery of unified lubricant, located within the upper portions of the die pair 12, 14. The apparatus 32 includes a movable die insert 34 and a stationary die insert 36. The details of these insert parts and the associated structure of the support dies 12, 14 and the lubricant supply apparatus 32 are best shown in Figures 3 to 6. The movable die insertion piece 36 includes a projection 38 which it extends through the main separation line 18 to coincide, when the dies are closed, with the recess 40 in the stationary punch insert 36. The projection 40 includes an internal supply cylinder 42 having an outer end opening 44 towards the outside of the movable die, and an inner end opening 46 through an inner end 48 of the projection 38. This end 48 of the projection is slightly angled to help opening and closing the mobile die. The cylinder 42 extends generally horizontally and parallel to the plane of the separation line 18 between the two dies 12-14. Nevertheless, if desired, the cylinder can be extended in a different direction to the horizontal one. Preferably, the horizontally positioned cylinder 42 has an upper filling opening 50 extending upwardly from the cylinder, through the upper wall of the projection 38. The opening 50 is generally rectangular and is longitudinally elongated to receive an element. unified lubricant that can generally be cylindrical and elongated in the longitudinal direction of the cylinder. When the dies are opened, as shown in Figure 2, the filling opening 50 is exposed for insertion of a unified lubricating element. However, since the inner end 46 of the cylinder 42 is also open at that time, the upper filling opening 50 can be suppressed, if desired, and the lubricating element can be inserted through the inner end 46 of the cylinder. On one end of the mobile ejector die, adjacent the outer end 44 of the cylinder, a bracket or bracket 52 is mounted on its outer end, and a drive cylinder 54 which can be of any suitable type, such as hydraulic or pneumatic. The cylinder 54 includes a rod 56 which is connected to a solid cylindrical piston 58 extending and reciprocating or reciprocable within the cylinder 42. In its retracted position, shown in Figures 3 and 4, the inner end 60 of the solid piston is located just outside the upper filling opening 50. When the solid piston 58 is fully advanced by the drive cylinder 54, the inner end 60 is aligned, or closely approximates, the inner end 46 of the cylinder. The end 60 of the cylinder may be inclined at its upper portions to coincide with the inclination of the cylinder end while the lower portion of the solid piston has a smaller inclination to allow space for shredding a lubricant container against the wall 28 of the cover die associated. A restricted conduit, in the form of a groove 62, can be formed in the wall 28 of the cover die - ?? -stationary, or in adjacent portions of the mobile ejector die, or both dies, to connect the inner end 46 of the cylinder with the die cavity 16, not shown in Figures 3 and 4. The forward stroke of the solid piston 58 it is limited by the stops 64, which are coupled by a rectangular head 66 formed at the outer end of the solid piston. The head 66 also cooperates with a guide 68 mounted on the holder 52 to prevent rotation of the solid piston within the cylinder 42. The head 66 can also be used to establish the contact of limit switches or other devices to control the drive of the cylinder. 54 of drive. The method of operation and the various forms of unified lubricating elements usable with the unified lubricant delivery apparatus include those of the type just described, which are indicated in substantial detail in copending application Serial No. 03003.032 mentioned previously. However, in general, prior to molding or casting the metal into the die-casting machine 10, the dies are opened and a unified lubricating element of any suitable shape is inserted into the cylinder 42 through the opening 50. of top fill or, alternatively, through the open inside end 46 of the cylinder. Subsequently, the dies are closed, and the drive cylinder 54 is operated to advance the solid piston 58 until its inner end 60 closely aligns with the inner end 46 of the cylinder. This crushes the unified lubricant element, which depresses and exits the lubricant which is rapidly driven through the restricted conduit defined by the groove 62 in the die cavity 16 as it coats the inner surfaces. After, molten molten metal is poured in a conventional manner, through the filling opening 24 into the interior of the molding cycle sleeve 20 and is driven as the piston 26 advances into the cavity 16, where it cools and solidifies. Subsequently, the dies are opened again and the finished part of the cavity 16 is removed. At this time, if the unified lubricating element is of the type included within a container that can be shredded, the shredded container is also removed from the inner end 46 of the cylinder 42, the solid piston 58 retracts and the mechanism is then ready for the insertion of another lubricant element and the repetition of the process. If the machine 10 is equipped in this manner, vacuum will be applied to the closed die cavity before passing the molten metal thereto. Vacuum may also be applied prior to operating the lubricant supply apparatus in order to assist in the distribution of the lubricant within the die cavity, and possibly within the molding cycle sleeve. Figures 7 to 9 illustrate a slightly modified embodiment of the apparatus 70 for unified supply, also installed within a die-casting machine, of which only the portions of the stationary and moving dies 12, 14 are shown. The apparatus 70 is of a larger size and is designed to be used with relatively larger die cavities compared to the previously described embodiment. But, since many of the elements are the same or similar to those described previously, similar numbers are used to indicate similar parts which do not need to be described further. The embodiment of Figures 7 to 9 differs in the form of a reinforced support 72, which supports the drive cylinder 54. In addition, a single stop 74 is mounted on the support 72, and which is coupled by the ends 76, 78 of the flat part 80 formed on the side of the solid piston 82. The flat part 80 is also coupled with the stop 74, which forms a guide to prevent rotation of the solid piston within the cylinder 42. It should be understood that the shape of the elements is such that the cylinder and the piston, which would be different from a circular cross-section, - the opening of the piston filled, which may have another shape than rectangular; the restricted conduit slot 62, which may vary in configuration; and other related elements may change in shape or position without changing the essential operating method and the structural relationships of the embodiments of the invention just described. Now, with reference to Figures 10 to 12, a different embodiment of apparatus for unified lubricant supply integrated in a die-casting machine indicated generally by the number 90 is shown. The die-casting machine 90 includes elements conventional ones similar to those of the machine 10 previously described and for which cylindrical numbers are used for similar parts. Therefore, the machine 90 includes stationary and movable dies 12, 14, defining a die cavity 16, spaced apart along the separation line 18. The stationary die carries a molding cycle sleeve 20 having an inner end 22 with a filling opening 24 near the outer end, and a piston 26 received in reciprocating or reciprocating movement within the sleeve 20. The molding cycle sleeve the molten molten metal receives through the filling opening 24 and the piston 26 drives it through a restricted conduit 30 formed by a slot and with a door in the wall 28 of the mobile die and into the interior of the cavity 16 of the die The die-casting machine 90 also includes an apparatus 92 for supplying lubricant. The apparatus 92 includes a movable die insert in the form of a sleeve 94 and a stationary die insert in the form of a block 96. As shown in Fig. 12, the block 96 includes an end wall 98 which is along the separation line 18 when the dies 12 and 14 are closed. The sleeve 94 extends from the separation line 18 outwardly within the movable die 14 and internally defines a supply cylinder 100 having an inner end 102 which opens along the separation line 18 but which is closed by the end wall 98 of the stationary punch insert 96 when the dies are closed. A support 104, mounted on the outside of the movable die 14, supports a drive cylinder 106 having a rod 108 extending into the interior of the cylinder 100 through an open exterior end 110 thereof and connecting with a member. of crushing the solid piston 112 which performs a reciprocating or reciprocating movement inside the cylinder.

In the retracted position of the solid piston 112, shown in Figures 10 and 12, the inner end 114 of the solid piston separates from the end wall 98 of the opposite block to form a chamber 116 into which a lubricating element can be placed. unified when the dies are open. A slot 118 is formed in the face of the sleeve 94 and the associated mobile die forms a restricted conduit, when the dies are closed, connecting the chamber 116 to the die cavity 16. The arrangement of the cylinder 100 is generally perpendicular to the separation line 18 which requires slightly less alteration of the dies compared to the arrangement or parallel cylinder arrangement, previously described. However, both arrangements or arrangements may have advantages, based on the desired position of the drive cylinder or other components in relation to the work space necessary for the operation of the die-casting machine. Furthermore, it should be noted that, instead of being formed by insertion parts within the ejector and cover dies, the lubricant supply apparatus of both modes can be mounted on external portions of the dies and can be set within elements of separate body to define a chamber which is connected through a restricted conduit along the die separation line to the die cavity 16. In any of these possible arrangements, the operation of the lubricant supply apparatus is essentially the same. With reference to Figure 10 to 12, when the dies are open, as shown in Figure 11, a unified lubricating element can be inserted through the open inner end 102 of the cylinder 100, into the chamber 116 formed by the piston solid 114 retracted. Subsequently, the dies are closed and the solid piston 114 is advanced by the drive cylinder 106 to crush the lubricant element against the end wall 98 of the insert 96 of the stationary die. In this manner, the lubricant of the crushed element is rapidly pressed and exits out of the chamber and through the restricted conduit or groove 118 into the interior of the die cavity 16 to coat its surfaces with lubricant. Subsequently, molten casting metal is poured into the interior of the molding cycle sleeve 20 and is driven by the plunger 26 into the die cavity 16 through the restricted passage 30. After cooling, the dies are opened again and the finished molding is eliminated. If a lubricating element has been used in a container, the shredded container is subsequently removed from the inner end 102 of the cylinder and the solid piston 112 is retracted so that another unified lubricating element can be inserted into the interior of the chamber and the process. If the machine 90 is equipped, vacuum can be applied to the closed die cavity before pushing the metal therein. Vacuum may also be applied prior to operating the lubricant supply apparatus in order to assist in the distribution of the lubricant within the die cavity and possibly within the molding cycle guide sleeve. Referring now to Figure 13, there is shown an alternative stationary die insert 120, which can replace block 96 of the embodiment of Figure 12. The insert 120 includes a cured stopper 122 which has an end face 124 that provides a wear resistant surface against which the lubricant supply elements can be pressed. The plug 122 is supported by a support member 126 and is mounted inside the insert 120 from the opposite side. Figures 14 to 17 illustrate certain mechanisms or alternative means for driving the solid piston of an apparatus for supplying lubricant instead of the direct connected cylinders illustrated in the previously described embodiments. Although the mechanisms shown are illustrated, applied to a supply apparatus having a cylinder perpendicular to the die separation line, it should be understood that these mechanisms can equally well be applied, where space allows, to arrangements or parallel cylinder arrangements of the type illustrated in the figures 1 to 9 of the drawings. Figures 14 and 15 illustrate a rack and pinion mechanism for the lubricant supply apparatus including a stationary die insert 128 having a sleeve defining a supply cylinder 130 containing a solid piston 132 with movement of reciprocating or reciprocable in a direction perpendicular to the die separation line 18, as in the embodiment of Fig. 12. The solid piston 132 is connected to, and driven by a pinion 134 having teeth 136 which are engaged by a pinion gear 138, everything is mounted on the mobile die 14. The pinion gear 138 is externally connected to a lever 140, shown in FIG. 15. The lever is attached to a rod 142 of an external drive cylinder 144, which in operation, is operable to pivot the lever 140, which rotates the pinion gear 138 and moves the rack 134 linearly to advance or retract the solid piston 132 in the manner previously described. Figure 16 schematically illustrates another embodiment in which the rack 134 and the pinion gear 138 of Figure 14 are alternately driven by a second rack 146 reciprocating or reciprocable movement in the movable die and engaging the pinion 138. The second rack 146 is attached directly to an outer cylinder, not shown, for reciprocating or reciprocating movement of this rack. Figure 17 illustrates another embodiment of additional actuation in which a multi-piece insertion piece is provided for the movable die including a portion of the cylinder, not shown and a drive portion 148. The cylinder portion includes a sleeve defined by the supply cylinder, not shown, which receives a solid piston 150. The solid piston is formed integrally with a cam roller 152 having reciprocating or reciprocating movement in a recess 154 formed in the 148 portion of drive. The cam piston 152 includes an angled opening 156 which is engaged by a cam 158. The cam 158, when reciprocating or reciprocating movement, in the slots 160, 162 through a drive portion 148, is driven. or activated by a drive cylinder 164 connected directly. Alternatively, other means for propelling the cam 158 can be provided. It is noted that with respect to this date, the best method known to the applicant to carry out the aforementioned invention is the conventional one for the manufacture of the objects. to which it refers. Having described the invention as above, property is claimed as contained in the following:

Claims (14)

1. An apparatus for the supply of a unified lubricant, for a die-casting machine having a stationary die and a movable die forming a pair of dies defining, when closed, a separable die cavity in a line of separation between the dies, the movable die can be moved to and from the stationary die for closed and open positions of the pair of dies, and injection means for supplying molten molten metal, under pressure, to the die cavity to form a molded product. Pressure; the apparatus is characterized in that it comprises: a supply cylinder mounted in one of the dies, but separated from the injection means, the supply cylinder has an inner end and an outer end, the inner end, in the open position of the die, is open for external access, and, in the closed position of the die, is oriented towards the wall of another of the dies and connects the cavity through a restricted duct between the dies; a solid piston or rod with reciprocating or reciprocable movement in the cylinder, between an advanced or advanced position near the inner end of the cylinder, and a retracted, separated position away from the inner end; and means for driving the solid piston between the retracted and advanced positions to crush a lubricating element unified in the cylinder against the other die wall and drive the lubricant through the restricted conduit into the cavity.

2. The apparatus according to claim 1, characterized in that the supply cylinder and the solid piston are of circular cross section.

3. The apparatus according to claim 1, characterized in that the supply cylinder is formed inside the mobile die.

4. The apparatus according to claim 1, characterized in that the supply cylinder is formed by an insert member.

5. The apparatus according to claim 4, characterized in that the member of the insert is a sleeve.

6. The apparatus according to claim 1, characterized in that the wall is formed by an insert.

7. The apparatus according to claim 1, characterized in that the means for driving the solid piston includes a directly connected actuator cylinder.

8. The apparatus according to claim 1, characterized in that the driving means of the solid piston includes a rack and pinion mechanism.

9. The apparatus according to claim 1, characterized in that the driving means of the solid piston includes a cam actuator.

10. The apparatus according to claim 1, characterized in that the driving means of the solid piston is mounted on the mobile die.

11. The apparatus according to claim 1, characterized in that the supply cylinder extends generally parallel to the line of separation of the die.

12. The apparatus according to claim 11, characterized in that the supply cylinder also extends in a generally horizontal direction, the cylinder has a top filling opening between the open end and the solid piston in the retracted position to insert a lubricating element inside. of the cylinder.

13. The apparatus according to claim 1, characterized in that the supply cylinder extends generally perpendicular to the line of separation of the die.

14. The apparatus according to claim 13, characterized in that the inner end of the supply cylinder extends to approximately the line of separation of the die.