Slide assembly for injection mold

Abstract

To provide a slide assembly which can be used for an injection mold, and which is more economical and simpler than the conventional ones.SOLUTION: A slide assembly for an injection mold comprises: a closing wedge (1); a slide body (5) having a hole for housing at least a part of the closing wedge (1); and a figure insert (4) engaged with the slide body (5). The figure insert (4) in the use position is vertically and horizontally movable with respect to the slide body (5).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a slide assembly for an injection mold.

Background Art

[0002] In the field of injection molding, in order to manufacture a part of the appearance shape, a slide assembly may be used to form, for example, a protruding side portion of a product. A traditional system in a conventional molding method is mainly composed of a movable mold plate of a male mold, also called a molding plate, and a fixed mold plate of a female mold, also called a cavity plate. When the mold is opened, it operates only in one direction, and all machined parts must be removed from the mold by the movement in the opening direction of the mold. Therefore, it was impossible to reproduce or mold the shape of the side portion as seen in, for example, an undercut problem.

[0003] When performing molding involving the manufacture of a portion having a shape that cannot be demolded by a conventional method, it is necessary to apply a mechanism called a slide. This slide mechanism is for realizing displacement in a direction perpendicular to the opening direction of the mold in the mold opening process and the closing process. By using this mechanism, it becomes possible to demold the above-mentioned portions (negatives) in the vertical direction when the mold is opened and when the injection-molded product is demolded.

[0004] Therefore, in order to make the problematic appearance portion demoldable, in each case, it was necessary to move the slide itself along guides or rails that determine the path to be traveled by the slide.

[0005] When using such a conventional slide assembly, there are disadvantages such as an increase in the number of component parts forming the structure and an increase in the man-hours of machining, resulting in complexity and an increase in cost.

[0006] Furthermore, achieving the intended movement requires a structure that involves extending an inclined guide, which in turn restricts the degree of freedom in space. As a result, when considering automating the manufacturing system, it becomes difficult to use robots that perform actions such as pulling out parts. [Overview of the project] [Problems that the invention aims to solve]

[0007] In view of these circumstances, the object of the present invention is to provide a slide assembly that can be used in injection molding dies and is more economical and simpler than conventional slide assemblies. [Means for solving the problem]

[0008] A slide assembly usable in an injection molding die according to the present invention is defined in claim 1. Additional features of the slide assembly according to the present invention are described in the dependent claims.

[0009] The slide assembly according to the present invention comprises multiple interconnected elements and can be introduced into a mold plate and used as a slide unit. As a result, while conventional methods required high hardening and precision in the base guide to achieve perfect operation, this is no longer necessary according to the present invention. Furthermore, according to the present invention, there is no need to incorporate inclined guides or the like to enable slide movement, and auxiliary mechanisms to maintain the slide state during the injection process are also unnecessary.

[0010] The only requirement for the slide assembly is that a recess is formed on a punch plate (punch plate) that houses the magnetic slide base, and the punch plate is formed, for example, from a non-magnetic stainless steel base. A properly polarized magnet is housed in the recess. A plate of non-magnetic slide material is bonded to this recess using adhesive, forming a parallelepiped assembly with dimensions to suit each slide model.

[0011] Furthermore, at a predetermined position, the slide assembly incorporates a positioning ball, which, when pressurized by a spring, functions as a positioning member for fixing the slide body when the mold is released.

[0012] The magnetic base is positioned within the mold by its own gripping force, and the slide assembly maintains reliable adhesion throughout the entire operating cycle. A slide stopper is incorporated into the assembly, but this is merely a further guarantee that the slide will not move unintentionally even if malfunctions occur within the mold.

[0013] The closing wedge includes an extension that extends at an angle or inclination to form a slide bevel. With this configuration, the slide assembly can be slid in response to the opening and closing operation of the mold by using an angular socket designed to achieve this purpose. This is because a contact surface is formed between the closing wedge and the slide body through this opening and closing operation. That is, due to the inclination angle of these parts, the slide body slides forward when the mold is closed, and slides backward in the same manner when the mold is opened.

[0014] The closing wedge also has an adjustment plate based on the correct dimensions. Therefore, when the mold is closed, the bearing surface and the precise seal between the punch plate and cavity plate fit together tightly. Only one screw is needed to fully secure the closing wedge within the cavity plate housing.

[0015] The sliding body has a parallelepiped shape and an angled or inclined hole. A closing wedge, which forms part of this assembly, is slidably fitted into this hole.

[0016] The end of the slide body into which the shaped insert is mounted is provided with a hole or slot that extends laterally across the entire width of the slide. This hole or slot has an inverted L-shape, and its longitudinal tolerance is comparable to that of any slide system used within this sector. On the other hand, when assembled, a slight displacement is permitted laterally between the hole or slot of the slide body and the extension of the shaped insert.

[0017] A magnet, correctly positioned in a slot or L-shaped hole on one side of the slide body, exerts magnetic force, which functions to maintain lateral contact between the mold insert, such as a shape insert, and the slide body. A groove is formed on one side of the slide body, allowing for the installation of a slide stopper within the mold. This slide stopper does not prevent the slide body from sliding. However, the presence of the lower part of this groove allows the slide stopper to function as an operating safety device.

[0018] The shape insert is a parallelepiped having predetermined dimensions and can be attached to the slide body using protrusions that extend laterally and in an inverted L-shape. The protrusions have a shape that allows them to be fitted into slots or holes extending laterally in the slide body and have appropriate tolerances to achieve the appropriate displaceability required depending on the location.

[0019] The slide stopper is an element formed by cylindrical columns of predetermined dimensions, and has a housing that surrounds and accommodates fixing screws in the vertical direction. By machining them so that they are staggered when viewed horizontally, extended portions are formed, and these extended portions function as support guides for the slide body when it is mounted on the mold.

[0020] The assembly between the slide body and the shape insert is achieved by machining these two parts in an inverted L-shape, which are held in place by the interaction of magnetic forces of magnets. Furthermore, by positioning them correctly, friction between the shape insert and the mold cavity during operation can be prevented. In this way, any friction that may cause defects or burr formation in the injection section can be avoided.

[0021] When two components are assembled together, due to the tolerances and allowable errors mentioned in the machining section, once they are fitted together, not only is lateral sliding movement possible between the two parts, but also angled sliding movement is possible. In this case, the safety of the axial connection is not compromised.

[0022] From this perspective, it can be seen that the "chain link" effect is achieved by having manufacturing tolerances. In other words, the two parts together constitute a single element, but these two parts can move around themselves within a limited range, both vertically and horizontally, as well as in slight oscillations and rotations, without compromising their inherent axial connection.

[0023] When the shape plate and the insert are set to a critical point of adjustment, the sliding function of the slide assembly within the mold no longer requires the high precision required in conventional systems. Consequently, what was necessary in conventional slides to control the slide to reach the end of its stroke can now be accomplished with a simpler slide path.

[0024] The advantages of the slide assembly according to the present invention can be found in relation to the type of machining and positioning of the shaped inserts, which are all interchangeable depending on the design, and in any case perfect centering can be maintained. Such effects are achieved by tapering and horizontally fitting the inserts and cavities (also called recesses or cavities) together, or by flat surfaces contacting each other between the cavities and the closing plate.

[0025] This design and adjustment mechanism enable frictionless fitting, and during the closing operation, the shaped insert is held in a slightly lifted position, preventing it from rubbing against the slide surface. Furthermore, the shaped insert is supported only in the final stage of closing the cavity plate, and this support allows it to move towards the lower side plane of the closing plate.

[0026] Support of the cavity plate when the mold on the shape insert is closed ensures that this part of the mold closes securely. Until secure closing occurs at the end of the closing stroke, the above contact allows the shape insert to be slid slightly, guiding the shape insert out of the housing while sliding it.

[0027] Machining in the vertical direction between the lateral adjustment cones and the support base is carried out with the highest precision. This is because, although friction could occur due to displacement in conventional systems, in the present application, there is no longer a need to perform classic conical machining to avoid friction.

[0028] When attempting to achieve the accuracy required in conventional slides, the manufacturing cost becomes high due to the precision required for operation. This is because the harder the rigid element, the more it needs to be movable between the shape insert in each cycle and fit precisely. Therefore, any small misalignment in the connection between these two parts may cause burrs in the injection product.

[0029] The slide assembly according to the present invention brings about a fundamental change compared to the generally adopted concepts. This is because the number of components is sufficient to be less than before (that is, the manufacturing cost can be suppressed), and when adopting the shape and arrangement as in the present application, machining the mold becomes simpler and easier, and as a result, the manufacturing cost can be suppressed. Another advantage that those skilled in the art of injection molding will highly evaluate is that since there is no need to provide an inclined guide to realize a planned displacement, the cavity plate is separated from any protruding part, and there is no need to arrange such a guide in the first place. Also, for this reason, conventionally, in order to automate the manufacturing system, it was necessary to use a robot to pull out parts, but in the present application, such a constraint is eliminated, and it can be made significantly simpler.

[0030] To supplement the prepared specification and to assist in deepening the understanding of the features according to the present invention, a series of drawings are attached here as an integral part of the specification based on preferred examples of specific embodiments.

Brief Description of the Drawings

[0032] The slide assembly according to the present invention comprises a slide body 5, the slide body 5 having a hole 51 for accommodating a closing wedge 1, and a shape insert 4 is attached to the slide body 5.

[0033] The closing wedge 1 comprises a parallelepiped main portion 14 and an extension portion 15 as shown in Figure 2. The extension portion 15 is housed in the hole 51 of the slide body 5. Preferably, the extension portion 15 forms an acute angle with the main portion 14, thereby defining an inclined surface, which preferably complements or corresponds to the inclined surface defined by the hole 51.

[0034] This slide assembly is designed to move the shape insert 4 attached to the slide body 5 when the closing wedge 1 is activated as the mold opens and closes.

[0035] The closing wedge 1 is attached to a part of the mold referred to as the injection side by the housing of the cavity plate, which is adjusted to the dimensions of the closing wedge 1 and the screw 3.

[0036] Furthermore, the closing wedge 1 includes an adjustment plate 2 located on the closing wedge 1. In particular, the adjustment plate 2 is located on the main portion 14, away from the extension portion 15. With this configuration, when the mold is closed, the height position within the mold housing is adjusted to a precise position.

[0037] In this way, the inclined surface of the extension 15 of the sealing wedge, i.e., the closing wedge 1, comes into contact with the inclined surface of the hole 51 of the slide body 5, and is positioned precisely in the correct location. As a result, the shape of the shape insert 4 is adapted to the position of the shape insert in the mold, and no leaks occur when the plastic, such as the molded product, is injected.

[0038] The assembly of the slide body 5 and the shape insert 4 moves above the slide base 6. The slide base 6 is made of a magnetic material and consists of a built-in magnet 8. This configuration allows the slide base 6 to remain attached to the mold even during the translation process when the mold is opened and closed.

[0039] Furthermore, the slide base 6 includes a slide layer 7 positioned between the slide base 6 and the slide body 5. This slide layer 7 is made of a low-friction material such as PTFE (polytetrafluoroethylene) resin with added turcite®, i.e., a filler (e.g., bronze).

[0040] By using a material with such low friction characteristics, wear of the slide body 5 when it slides on the slide base 6 can be prevented. Furthermore, the slide layer 7 has the characteristic of not requiring lubrication (i.e., it is self-lubricating).

[0041] The cross-sectional view shown in Figure 3 allows us to see how the screw 3 penetrates the slide body 5 and how it secures the closing wedge 1 and the adjustment plate 2. For this purpose, the closing wedge 1 has a screw hole in the part into which it is inserted. This configuration prevents the closing wedge 1 from becoming loose and falling out when the screw is removed for disassembly. Another advantage of this configuration is that it eliminates the risk of losing the closing wedge.

[0042] Furthermore, the slide assembly according to the present invention includes a slide stopper 9 as shown in Figure 1. The main function of this slide stopper 9 is to prevent the slide assembly from being in the wrong position and causing the slide body 5 to slide out of the mold if some abnormality occurs during the injection process. It also has the function of eliminating the risk of the slide body 5 being pushed out of the mold and falling off.

[0043] For this purpose, the slide stopper 9 is bolted to the mold, and the slide stopper 9 also has a flange that functions as a stopper.

[0044] As described above, the slide assembly moves each time the mold is opened and closed. When the mold is closed, the bonding force between the parts and the fit to the mold shape insert are improved, and it is confirmed that this slide mechanism is not replaced by the injection pressure when the plastic is injected into the mold cavity.

[0045] However, when the mold is opened, it is extremely important that the position of the slide assembly at the time of mold opening is accurate and repeatable in each cycle. For this purpose, the magnetic slide base 6 performs this function, making it possible to achieve the above-mentioned position.

[0046] Another technical advantage of the slide assembly according to the present invention is that the shape insert 4 can move freely relative to the slide body 5.

[0047] For this purpose, the shape insert 4 has an L-shaped projection 13, which is housed in a corresponding (complementary) hole 16 of the slide body 5 with a gap between them. This allows the shape insert 4 to move vertically and horizontally relative to the slide body 5, as well as to tilt and rotate around a horizontal axis in the position of use. In other words, the slide body 5 can move from left to right, up and down, and can also move by tilting and rotating. The movement of the shape insert 4 in this manner is shown in Figures 4 to 6. These drawings show three positions for the shape insert 4 relative to the slide body 5.

[0048] Furthermore, the slide body 5 is equipped with one or more magnets 10, which are positioned adjacent to the holes 16 corresponding to the protrusions 13. These one or more magnets 10 can hold the shape insert 4 in place by the magnetic force of the magnets themselves. When the shape insert 4 is held in place correctly, friction between the shape insert 4 and the mold cavity during operation can be prevented, thereby preventing any abrasion that could cause defects or burrs in the injection molding section.

[0049] The reason for this freedom of movement is that the angular position of the shape insert 4 of the slide assembly relative to the shape insert 4 of the mold is adjusted by locking it at a 10° taper. By adjusting the angle in this way, it is possible to keep the shape insert 4 of the slide assembly in the correct position. In this way, while conventional slide assemblies require precise and strict alignment, the slide assembly according to the present invention is freed from such a need, and as a result, the need for high-precision machining can be reduced. Furthermore, in conventional slide assemblies, it is necessary to maintain the position of the slide assembly with high precision prior to the adjustment and assembly of the shape insert in the next process, and for this purpose a side guide was required, but in the present invention such a side guide can be eliminated.

[0050] Furthermore, the slide base 6 is equipped with a positioning ball 19 secured by a spring for positioning the slide base 6, and also has a removal hole or disassembly hole 12 that can be easily removed using a wrench. This wrench can also be used to remove the screw located in the slide stopper 9.

[0051] As can be seen in Figure 1, and especially in Figures 7 and 8, the shape insert 4 comprises an inclined side portion 17 and a stop surface 18.

[0052] Thus, when the shaped inserts 4 are assembled within the mold cavity, there are tolerances between them. Therefore, once they are fitted together, transversal sliding and angular sliding can occur between them without compromising the stability of the axial connection.

[0053] From this perspective, it is understood that the effects of a "chain link" can be obtained by having manufacturing tolerances. That is, two parts come together to form a single element, and in such a case, they can be laid out in a state centered on themselves within a limited range, such as vertical, horizontal, and slight oscillating motion, without impairing their inherent axial connection.

[0054] In other words, during assembly, the inclined side portion 17 first comes into contact with the corresponding complementary side wall of the cavity shown in Figure 7, causing it to move laterally so that it fits snugly into the cavity, and the stop surface 18 comes into contact with the inner wall surface of the cavity (Figure 8).

[0055] As described above with reference to specific embodiments of the present invention, it will be apparent to those with ordinary skill in the art that various changes and modifications can be made to the described slide assemblies. Furthermore, all of the described and detailed components can be replaced with other components equivalent in the art without departing from the scope of protection set forth in the appended claims.

Claims

1. 1. A slide assembly for an injection molding die, comprising: a closing wedge (1); a slide (5) having a hole for receiving at least a part of the closing wedge (1); a shaped insert (4) engaged with said slide body (5); Equipped with A slide assembly, wherein when in the use position, said shaped insert (4) is vertically and horizontally movable relative to said slide (5).

2. 2. A slide assembly for an injection mould according to claim 1, wherein the profile insert (4) is pivotable about a horizontal axis relative to the slide body (5) in the use position.

3. 3. A slide assembly for an injection mould according to claim 1 or 2, wherein the shape insert (4) comprises a protrusion (13) received in a corresponding hole (16) in the slide body (5).

4. 4. A slide assembly for an injection molding die according to claim 3, wherein the slide body (5) is provided with at least one magnet (10), the magnet (10) being positioned adjacent to the corresponding hole (16).

5. A slide assembly for an injection molding mold as described in claim 1, further comprising a slide base (6), wherein the slide body (5) is placed on the slide base (6) and the slide body (5) slides on the slide base (6).

6. A slide assembly for an injection molding mold as described in claim 5, wherein the slide base (6) is a magnetic material.

7. A slide assembly for an injection molding mold as described in claim 5, wherein the slide base (6) has a slide layer (7) arranged between the slide base (6) and the slide body (5).

8. 8. A slide assembly for an injection mould according to claim 7, wherein the slide layer (7) is filled with polytetrafluoroethylene resin.

9. A slide assembly for an injection molding mold as described in claim 1, wherein the closing wedge (1) has a main portion (14) and an extension portion (15), and the extension portion (15) is accommodated in a hole in the slide body (5).

10. 10. A slide assembly for an injection molding die according to claim 9, wherein the extension portion (15) forms an acute angle with the main portion (14) and defines an inclined surface, the inclined surface corresponding to the inclined surface defined by the hole.

11. A slide assembly for an injection molding mold as described in claim 1, wherein the closing wedge (1) has an adjusting plate (2) positioned at a position farthest from the slide body (5).

12. A slide assembly for an injection molding mold as described in claim 1, further comprising a screw (3) passing through the closing wedge (1).

13. A slide assembly for an injection molding mold as described in claim 5, wherein the slide base (6) is provided with a positioning ball (19).

14. A slide assembly for an injection molding mold as described in claim 5, wherein the slide base (6) has a removal hole (12).

15. A slide assembly for an injection molding mold as described in claim 1, wherein the shaped insert (4) has an inclined side portion (17).

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