MXPA06010568A - Mold assembly - Google Patents

Abstract

A mold assembly wherein a cavity for molding is defined by primary mold cavity and primary mold core elements (22, 24) and a supplemental core element (16), the primary mold cavity (50) and primary mold core elements (22, 24) are carried by first and second mating mold components (12, 14) and the supplemental core element (16) is carried by a slide (18) moveable transversely relative to the direction of motion of the mating mold components (12, 14). The slide (18) is supported by the first mating mold component (14) and has an opening (36) therein for engaging an actuating pin (38) supported by the second mating mold component (12) at an angle oblique to the parting line face of the second mating mold component (12). The actuating pin (38) is removable retained in a support opening (48) in the parting line face of the second mating mold component (12) by means accessiblefrom the second mating mold component parting line face.

Description

MOLD ASSEMBLY I. BACKGROUND OF THE INVENTION Field of the Invention This invention relates, generally, to injection molding apparatus and, more particularly, to pins for effecting the movement of mold cores in sets of molds.

Description of the Prior Art The mold assemblies, to which the present invention pertains, comprise matching mold components, which define at least one mold cavity, these matching mold components are carried by members of molding machines, which can be move in mutual relation, to join and separate the mold components. At least one matching component comprises a primary mold core elements and at least one matching component comprises a primary mold fitting element, the mold components are joined together on the faces of the so-called dividing line of the mold assembly (so-called faces) of division lines). It is known to mold articles comprising features that require at least one additional mold core, which can be moved relative to the mold component, for example to form a transverse recess of a primary mold core. It is known to provide these mold cores on sliding members, which can be moved with recesses of the mold components. The movement of the sliding members is advantageously carried out passively, with the movement of the matching mold components by the coupling of a pulse pin mounted obliquely to the dividing line of the mold assembly. These impulse pins are known in the art as angled pins that derive from the oblique orientation in which they are mounted. The movement of the mold components coinciding towards and away from the dividing line, is transferred to a transverse movement of the sliding members. In the known mold assemblies, it is known for the matching mold components to comprise plates for the assembly of primary core elements and primary cavity elements. With the known mold apparatus, the impulse pins for supplementary cores pass through the plate of the mold component, in which they are retained and held in place by elements on the side of a plate of the mold component, opposite to the face of the mold component division line With these known arrangements, the transverse holes for the impulse pins impose restrictions with respect to the placement of the conduits within such plates for, for example, the transfer fluids of heat. In addition, in such known mold assemblies, access to the drive pin that retains the bolts, requires the removal of the mold components from the machine members and / or the disassembly of the mold components to allow removal of the pin. of impulse from the mold component. Accordingly, it is the known mold assemblies that the replacement of worn impulse pastes is disadvantageously complicated by the removal and disassembly of the mold components.

II. SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold assembly that overcomes the disadvantages of known mold assemblies, wherein the pulse pins are retained in the openings that pass through the mold components and are retained there by elements accessible only from the face of the mold component opposite the face of the dividing line.

It is another object of the present invention to provide a mold assembly comprising a matching mold component, in which a passive driver of the side of the supplemental core is retained in the mold component by means accessible from the face of the dividing line of the components. printed. Other objects and advantages of the invention will become apparent from the accompanying drawings and from the following description thereof. According to the aforementioned objects, of the present invention, there is provided a mold assembly comprising a first and a second matching mold components, one of the first and second matching mold components comprising a primary core element and the other of this first and second mold components coincident, comprises a cavity element, said first and second matching mold components are joined at their faces of dividing lines, a side member for carrying a supplementary core element, the sliding member supported by and able to be moved in relation to with the first matching mold component, the side member having an opening, and a pulse pin for connecting the opening in the side member to effect its movement, with the movement of the first and second mold components in mutual relation, the impulse pin being retained removably in a support opening in the face of the dividing line of the second a matching mold component, by means accessible from the face of the dividing line of the second matching mold component and being supported on the second mold component coinciding at an oblique angle to the face of the dividing line of the second matching component .

III. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a sectional view of the matching mold components of a mold assembly, according to the invention, the matching mold components are shown attached; Figure 2 is a sectional view of the portion of the matching mold components of Figure 1, where these matching mold components are shown separately; and Figure 3 is a three-dimensional view of the pulse pin, shown in Figure 1.

IV. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT For the purpose of illustrating the invention, a preferred embodiment will be described in detail, with reference to the accompanying drawings. It is not the intention of the applicant that the invention be limited to the preferred embodiment to the details thus shown and described. Referring to Figure 1, the mold assembly 10 comprises first and second matching mold components, 12 and 14, and a supplementary mold core element 16, mounted to the movable sliding member or slide 18. The first and second components of matching molds, 12 and 14, meet on their faces, along a dividing line 20 and carry primary and primary core cavity elements, 22 and 24, which define the configuration of an article to be molded (Only a portion of the primary cavity and primary core elements are shown in Figures 1 and 2). The faces of the components, 12 or 14, of matching mold, are joined in the dividing line 20 and are referred to herein and in the appended claims as the faces of the dividing line. The material that is molded, shown in Figure 1 at 50, fills a mold cavity defined by elements, 22 and 24, of primary cavity and primary core, and the core element 16 of additional mold. With the elements of the primary cavity and the first core, 22 and 24, attached, the sliding member 18 and the core element 16 of the supplementary mold are retained in place by the stop of the bead block 26 and the side member 28. The bead block 26 is fixed to the matching mold component 12. The matching mold component 12 advantageously comprises the base plate 28 of the cavity and the cavity retention plate 30, whose primary cavity element 22 is secured. The matching mold component 14 advantageously comprises the base plate 32 of the core and the core retaining plate 34, to which the primary core element 24 is secured. While shown and described with reference to the preferred embodiment as comprised of different elements, it is considered that the matching mold component 12 may also comprise a unitary element, which includes a primary cavity defining the features formed therein. Similarly, the matching mold component 13 can comprise a unitary element including a recess for the primary core sliding member defining the characteristics formed therein. Furthermore, while the supplementary mold core element is illustrated as a separate element from the side by which it is carried, the sliding member 18 may also be a unitary element with the supplementary core defining the characteristics formed therein. Referring to Figure 2, it will be understood that the removal of the molded article requires the separation of the matching mold components, 12 and 14. These matching mold components 12 and 14 are supported by machine members for relative movement to join and separating the primary cavity and primary core mold elements, 22 and 24, the movement being bi-directional, as indicated by the double-headed arrows in the dividing line 20. While in the typical injection molding machine, one matching mold component is stationary and the other is movable, the present invention is directed only with the movement of the matching mold components 12 and 14 in mutual relation, regardless of whether one or both move, apart from the separation of the primary and core cavity elements, 22 and 24, removed from the molded article require the translation of the supplementary mold core element 16, away from the molded material 50. The movement of the sliding member 18 is effected by the passive action through cooperating of the opening 36 in the sliding member 18 and the driving pin 38. Cone shown, the opening 36 and the thrust pin 38 are disposed obliquely to the relative movement direction of the matching mold components, 112 and 14. With the drive pin 38 engaging the surfaces of the opening 36, the relative movement of the matching mold components, 113 and 14, is resolved into a component transverse to the direction of movement of the movable mold components. Thus, the relative movement of the matching mold components, 13 and 14, to join the primary cavity and primary core elements, 22 and 24, will translate the sliding member 18 and the supplementary core element 16 towards the primary core element 2 and will bring the heel block 26 in abutment contact with the sliding member 18, as shown in Figure 1. The relative movement of the matching mold components, 12 and 14 to separate the elements, 22 and 24, from cavity primary and primary core, will relieve the butt contact of the bead block 26 and will translate the sliding member 18 and the supplementary core element 16 away from the primary core element 24, as illustrated in Figure 1. The translation of the medium sliding 18 away from the primary core element 24 is stopped by the abutting contact of the stop sliding block 18.

According to the invention, the pulse pin 33 is retained, removably, in the support opening 48 on the face of the dividing line of the matching mold component 12, this support opening 48 being closed with the component matching mold 12. The impulse pin 38 is inserted into and removed from the support opening 48 from the face of the dividing line of the mold component 12. The push pin 38 is retained, removably in the support opening 48 or accessible means to the face of the dividing line of the matching mold component 12. As seen in Figure 2, the key 40 is mounted to the face of the dividing line of the matching mold component 12 and engages the tongue 44 (Figure 3) of the impulse pin 38 for retaining the impulse pin 38, in the support opening 48. The key 40 is fixed to the component of matching mold 12 by a fastener, such as screw 46. To prevent interference of key 40 and sliding means 18, when the dividing line faces the matching mating mold components, relief is provided in one or both of the dividing line face of the matching mold component 12 and the confronting surface of the sliding means 18. As shown in Figures 1 and 2, the key 40 is received inside the recess 42 in the face of the line division of the comp matching mold body 12. Referring to Figure 3, it will be seen that the drive pin 38 is headless, ie, it does not have a gripping end and a diameter that forms a support for seating against the supporting surface. Rather, the thrust pin 38 has a notch 44 at its periphery, this slit 44 is coupled to the retention element for retaining the thrust pin 38 in a support opening, such as the support opening 48 open only in the face of the dividing line of the matching mold component 12. Advantageously, the push pin 38 is bevelled at the received end within the support opening 48 for ease of insertion therein. In addition, this thrust pin 38 is advantageously tapered at the end which is coupled to the opening 37 in the sliding member 18. As shown in Figure 3, the notch 44 is advantageously made to align with the intersecting line of the face of the dividing line, with the longitudinal axis of the driving pin 38, as the pin 38 is oriented, when held in the supporting opening 48. Alternatively, the notch 44 may be aligned with a line perpendicular to the longitudinal axis of the drive pin 38, and the shoulder for the key in the starting line accommodates the consequent inclination of the key 40 relative to the division line faces. .

INDUSTRIAL APPLICABILITY The present invention overcomes the disadvantages of the known arrangements for the passive performance of the supplementary mold core elements, in which the impulse pins are retained in the openings through the matching mold components, retaining accessible means only from the face of the matching mold component, opposite its face of the dividing line. In particular, the present invention overcomes the need for an opening through a matching mold component and overcomes, consequently, the disadvantage that such openings restrict placement within the matched mold component of the conduits for, for example, the heat transfer fluid. Further, by making the elements to retain the momentum pin in the component the matching mold accessible from the face of the dividing line of the matching mold component, the need to remove and / or disassemble the mold assemblies to replace the momentum pins , it is overcome.

While the preferred embodiment has been described in detail, it is not the intention of the applicant that this invention be defined by the details of the preferred embodiment, but that the invention will be defined by the appended claims and all equivalents thereof.

Claims (4)

1. CLAIMS 1. A mold assembly, comprising: a) a first and second matching mold components, one of this first and second matching mold components comprising a primary core element and the other of these first and second matching components, comprises a primary cavity element, said first and second matching components being on their faces of the dividing line; b) a sliding member, to carry a supplementary core element, this sliding member is supported by a moving means relative to the first matching mold component, this sliding member has an opening therein; c) an impulse pin, without a head, for coupling the opening in the sliding member, and effecting its movement, with the movement of the first and second mold components coinciding in mutual relation, the impulse pin is retained, in shape removable in a support opening, on the face of the dividing line of the second matching mold component, this notch pin is removably attached to the second mold component, by means accessible from the face of the dividing line of the second mold component, this impulse pin has a notch in its periphery; and d) a key, for coupling the sample attached, removably, to the second mold component, by means accessible from the face of the dividing line of the second matching mold component, this impulse pin being retained in the support opening by engaging the notch and the key at an oblique angle to the face of the dividing line of the second matching mold component, whereby, with the removal of the key, this impulse pin can be removed from the opening of the mold. support in the second mold component from its dividing line face.
2. 2. The mold assembly of claim 1, wherein, with the mold components mating together, the key is received in an embossing provided on at least one of the face of the dividing line of the second matching mold component and the surface that it faces the means of sliding.
3. 3. The mold assembly of claim 2, wherein the notch is aligned with the line of intersection of the face of the dividing line, with the longitudinal axis of the pulse pin, as this pulse pin is oriented when it is retained in the second component of the matching mold.
4. 4. The mold assembly of claim 3, wherein the notch is aligned with a perpendicular to the longitudinal axis of the impulse pin and the enhancement is made to accommodate the tilt of the key to the face of the dividing line of the matching mold component. .