JP4761368B2 - Injection mold - Google Patents

Description

  The present invention relates to an injection molding die, and in particular, in an injection molding die that can change molding specifications such as single-cutter specifications and double-cutter specifications by exchanging the telescopic pieces, it is easy to replace the telescopic pieces. The present invention relates to an injection mold that can be performed at low cost.

  For example, as shown in FIG. 12, an injection mold 1 for molding a resin molded body is generally composed of a movable mold 2 and a fixed mold 3, and the movable mold 2 and the fixed mold are arranged. As shown in FIG. 13, arbitrary cavities 4 a and 4 b are defined by clamping the mold 3. The cavities 4a and 4b are provided with a sprue 5a, a runner 5b, and a gate 5c as resin passages in the mold 1 and filled with molten resin through the resin passages to obtain a resin molded product having a desired shape. Molded.

  Here, when the resin molded products molded in the respective cavities 4a and 4b are 4A and 4B, for example, when 4A and 4B are simultaneously molded in one molding cycle, the runner communicates in the middle of the runner 5b. A die having a structure in which the insert piece unit 6 is arranged and the cavities 4a and 4b can be simultaneously injected and filled with molten resin is adopted. On the other hand, for example, when only the resin molded product 4A on one side is molded and the resin molded product 4B on the other side is not adopted, the insert piece unit 7 for stopping the resin is arranged in the middle of the runner 5b. The supply is stopped. FIG. 14 shows the configuration of the runner communication telescoping unit 6. In the unit 6, the insert pieces 6a are attached to the movable mold 2 and the fixed mold 3, respectively, and each insert piece 6a has a groove 6b having a semicircular cross section and is formed by a bolt 6c. The insert piece 6 a is attached to the molds 2 and 3. And the groove parts 6b are united by joining the insert piece 6a, and it is comprised so that resin may be flowed by making the runner 5b communicate.

  On the other hand, as shown in FIG. 15, in the insert piece unit 7 for resin stop, the insert piece 7a attached to the movable mold 2 and the fixed mold 3 has a flat joint surface. The insert block 7a is attached in the middle of the runner 5b with the bolt 7b, and the runner 5b is cut off and the supply of the molten resin is cut off to the cavity 4b on the other side. A conventional example of a configuration in which a molding condition (molding specification) of the molten resin is adjusted by providing an adjustment insert in the runner is described in detail in Patent Document 1.

JP 2003-320559 A

  Thus, conventionally, when changing the molding specifications and molding conditions, an adjustment insert is attached to the mold in the middle of the runner. For example, when the resin is allowed to flow through the runner 5b, two telescopic pieces 6a provided with the groove 6b are prepared and attached by bolting corresponding to the movable side mold 2 and the fixed side mold 3, respectively. On the other hand, when the supply of the resin is stopped, the insert pieces 7a each having a flat face are assembled to the movable mold 2 and the fixed mold 3 by using bolts 7b. Therefore, when using the insert piece units 6 and 7, a pair of insert pieces 6a, 6a, 7a and 7a are required, and each of them is supported by bolting. It has been pointed out that the replacement work at the time of replacement is troublesome.

  The present invention has been made in view of such circumstances, and simplifies the structure and mounting work of the runner communicating telescopic unit and the runner blocking telescopic unit when changing the molding specifications during injection molding. The purpose of this is to provide a mold for injection molding with reduced cost and improved practicality.

  In order to solve the above-mentioned problems, the present invention comprises a cavity mold and a core mold, and a molten resin is injected and filled into the cavity through a runner and a gate formed on a parting surface of the cavity mold and the core mold. This is an injection mold for molding an injection-molded product by changing the molding specification by selectively arranging a runner communication telescope unit and a runner shut-off telescope unit in the middle of the runner. In the injection mold as described above, the inserter unit for communicating the runner is composed of insert pieces each having a groove portion, and the runner can be communicated by aligning the groove portions, and the runner cutoff insert The piece unit is composed of an insert piece having a groove portion and an insert piece provided with a protrusion that fits the groove portion, and the runner is shut off by fitting the groove portion and the protrusion. Rukoto can, in both insert piece unit, characterized in that shared the insert piece provided with a groove.

  Here, the injection mold is composed of a movable mold and a fixed mold, and a runner and a gate are formed along the parting surfaces of both molds to supply molten resin to the cavity. Sprues communicating with these runners are provided on the fixed mold side. In addition, an ejector mechanism or the like is provided on the movable mold side.

  And the runner communication insert piece unit and the runner shut-off insert piece unit used when changing the molding specification are fixed to the movable mold and the fixed mold in the middle of the runner by bolting. . The runner communication telescope unit is prepared with a set of telescope pieces with grooves, and is assembled to the corresponding parts of the movable mold and fixed mold, and when both telescope units are joined, Form a runner. On the other hand, the inserter unit for shutting off the runner is prepared with an insert piece provided with a groove portion and an insert piece provided with a ridge to fill the groove portion, and assembled to a movable side die and a fixed side die, respectively. At this time, the ridge seals the groove.

  Therefore, since the inserter unit for communicating with the runner and the inserter unit for shutting off the runner can share the insert piece provided with the groove, the groove is provided on either the movable side mold or the fixed side mold. Therefore, when changing the molding specifications, it is only necessary to replace the insert piece for the mold on the other side, and the required number of insert pieces is smaller than the conventional structure. The number of mounting steps can be reduced while halving.

  Next, in a further preferred embodiment of the present invention, a cavity mold and a core mold are provided, and a molten resin is injected and filled into the cavity through a runner and a gate formed on the parting surfaces of the cavity mold and the core mold. Thus, an injection mold for molding an injection-molded product, and by selectively placing an insert piece in the middle of the runner, the molding specification is changed by connecting or shutting off the runner. In the injection mold, the runner communication insert piece is configured as a groove portion so that one side of the insert piece is configured as a runner communication insert piece and the other side is configured as a runner shut-off insert piece. If runners are inserted into the cavity part or the core parting surface, the runner communication inserts are formed. The groove portion of the runner is aligned with the groove portion of the runner provided on the parting surface of the mating mold, and the runner is communicated. On the other hand, the protrusions of the runner blocking insert piece are fitted into the groove portion and the runner is blocked. It is characterized by that.

  According to this embodiment, the insert piece used for the runner communication or the runner shut-off is a single piece, so that either the cavity type or the core type is used for the runner communication. Since it is only necessary to selectively install the insert piece and the runner blocking insert piece, the structure can be further simplified and the attachment work can be performed more easily.

  As described above, the injection mold according to the present invention is a telescopic piece having a groove as a configuration of a runner communicating telescopic unit and a runner shut-off telescopic unit used when changing molding specifications. If the insert piece having the groove is attached to the mold on one side and the insert piece unit for runner communication is used, the insert piece having the groove is attached to the mold on the other side. In the case of a runner-blocking telescopic piece unit, the telescopic piece having a protruding ridge that seals the groove may be assembled to the mold on the other side, so the number of telescopic pieces and the number of mounting steps can be halved. The structure can be simplified and the mounting workability can be improved.

  Furthermore, according to a preferred embodiment of the injection mold according to the present invention, the runner communicating insert piece and the runner shut-off insert piece are each used as a single insert piece, Since it only needs to be provided corresponding to the groove for the runner in the mold, the mold structure and the mounting operation can be further simplified.

  Hereinafter, the best mode of an injection mold according to the present invention will be described in detail with reference to the accompanying drawings. Note that the gist of the present invention is as described in the scope of claims, and the contents of the embodiments described below are merely examples of the present invention.

  FIG. 1 to FIG. 9 show an embodiment of the present invention. FIG. 1 is an overall view showing the structure of an injection mold according to the present invention. FIG. FIG. 3 is an explanatory diagram showing an example of the arrangement of the runner communication in the injection mold, FIG. 3 is an explanatory diagram showing an example of the arrangement of the runner communication, and FIGS. FIG. 6 and FIG. 7 are perspective views and cross-sectional views showing the configuration of the runner shut-off telescope unit, and FIGS. 8 and 9 are runner communication telescope units and runner shut-off inserts. FIG. 10 and FIG. 11 are cross-sectional views showing further modifications of the injection mold according to the present invention.

  In FIG. 1, an injection mold 10 according to the present invention is roughly composed of a cavity mold 20 on the fixed side and a core mold 30 on the movable side. More specifically, in the cavity mold 20, a locating ring 22 and a sprue bush 23 that are connected to an injection molding machine (not shown) are attached to a fixed side mounting plate 21. A template 24 (being a mold surface on the product surface side) 24 is attached.

  On the other hand, the core mold 30 on the movable side has a receiving plate 33 attached to the movable mounting plate 31 via a spacer block 32. The movable plate 34 and the core (the product back side) 35 which will be the mold surface) is attached. In addition, an ejector mechanism 40 is provided inside the core mold 30 to project an injection molded product from the mold. The ejector mechanism 40 moves up and down in conjunction with the ejector plate 41 that moves up and down, which is accommodated in a space defined between the receiving plate 33 and the movable side mounting plate 31, and the ejector plate 41. The ejector pin 42 and the sprue lock pin 43 are configured.

  FIG. 1 shows the clamping state of the injection mold 10, which is defined between the fixed side mold plate 24 and the core 35 when the cavity mold 20 and the core mold 30 are clamped. As the resin passage for filling the melted resin into the cavities C1 and C2, the sprue 50 is provided with the sprue 50 provided in the sprue bush 23, and the runner 51 and the gate 52 communicating therewith. Molten resin is supplied into the cavities C1 and C2.

  By the way, the sprue 50 in the injection mold 10 according to the present invention is set at a substantially central position of the runner 51, so that the resin flows from the spru 50 to the runner 51 in both directions, and the resin flows to the two cavities C1 and C2. As shown in FIG. 2, due to variations in the molding specifications, the molten resin is poured into the cavities C1 and C2 from the sprue 50, the runner 51, and the gate 52, respectively, and two molded products are molded simultaneously. As shown in FIG. 3, there is a case where the resin is poured only into the cavity C1 on one side and the resin is not poured into the cavity C2 on the other side, and only the molded product on one side is molded. And when changing such a molding specification, it corresponds to the exchange operation of the insert piece, and the feature is that the insert piece can be exchanged easily and quickly.

  That is, when the resin is injected and filled into the two cavities C1 and C2, as shown in FIG. 2, the runner communication telescope unit 60 is arranged in the middle of the runner 51, and the sprue 50 is moved in the direction of arrow A in the figure. Resin is poured in the B direction, and the resin can be injected and filled into the two cavities C1 and C2. On the other hand, as shown in FIG. 3, when the resin is injected and filled only into the cavity C1 on one side, a runner blocking nested piece unit 60A is disposed in the runner 51 from the sprue 50 to the cavity C2 on the other side. The runner 51 is dammed and the resin is poured only in the direction of the arrow A at the hatched portion indicated by the symbol D in the figure, and the resin is injected and filled into the cavity C1 on one side. However, the resin flows into the cavity C2 on the other side. The supply is shut off.

  The configuration of the runner communication telescoping unit 60 on one side will be described. First, as shown in FIGS. 4 and 5, in the inserter piece 60 for runner communication, the insert piece 61 attached to the core mold 30 is formed with a groove 61 a having a semicircular cross section at the center. A bolt hole 61b is provided on both sides of the runner 51, and a bolt 61c is inserted into the bolt hole 61b and fastened to the core mold 30. 30 is fixed. On the other hand, the insert piece 62 attached to the cavity mold 20 has the same shape set up and down symmetrically as the insert piece 61 provided with the groove portion 61a described above, and the groove portion 62a is vertically symmetrical with respect to the groove portion 61a. A bolt hole 62b for fixing to the cavity mold 20 is formed, and the bolt 62c is fastened to the cavity mold 20 to be attached to the cavity mold 20. Then, as shown in FIG. 5, if the insert pieces 61 and 62 are bolted to the cavity mold 20 and the core mold 30, respectively, the runners 51 can be communicated with each other by combining the groove portions 61a and 62a.

  On the other hand, as shown in FIGS. 6 and 7, the runner shut-off telescope unit 60 </ b> A has the same core 61 as the runner communication telescope unit 60 using a bolt 61 c as shown in FIGS. 6 and 7. Although the same is applied to the runner blocking insert piece unit 60A, the insert piece 63 to be assembled to the cavity mold 20 is changed for the runner cut insert piece unit 60A. That is, a convex strip 63a having a semicircular cross section is formed in the telescopic piece 63 so as to be fitted and sealed in the groove 61a of the telescopic piece 61, and the telescopic piece 63 is inserted into the cavity mold 20 through the bolt 63c in the bolt hole 63b. 7, as shown in FIG. 7, the groove 61 a of the insertion piece 61 on one side is sealed by the interaction of the insertion pieces 61 and 63, and the runner 51 is inserted into the runner blocking entry piece unit 60 </ b> A. The resin is stopped at Therefore, when the molding specification shown in FIG. 2 is compared with the molding specification shown in FIG. 3, the insert piece 61 is shared with respect to the core mold 30 in both of them. The insert piece 62 is assembled to the cavity mold 20 to form the runner communication insert piece unit 60, or the insert piece 63 is assembled to the cavity mold 20 and used as the runner shut-off insert piece unit 60A. You just need to change what you do.

  Therefore, conventionally, when the molding specification is changed, four insert pieces are required, and it is necessary to assemble them into the cavity mold 20 and the core mold 30 respectively. However, in the present invention, only the insert pieces 62 and 63 are used. Since the number of mounting steps can be halved, there is an advantage that the cost can be reduced and workability can be improved.

  Next, FIG. 8 and FIG. 9 show a modified example of the runner communication telescoping piece unit 60 and the runner shutoff telescoping piece unit 60A. The shape of each of the groove portions 61a and 62a and the ridge 63a is a square groove portion. 61a, 62a, and the ridge 63a having a square shape. Thus, the shapes of the grooves 61a, 62a and the ridge 63a are selected so as to match the shape of the runner 51 in the injection mold 10. Just do it.

  Next, FIGS. 10 and 11 show a further modification of the present invention. In the above-described embodiment, the runner communication telescope unit 60 and the runner shut-off telescope unit 60A have one side telescope. Although the piece 61 is shared, in order to further simplify the mold structure, as shown in FIG. 10 and FIG. A configuration is adopted in which a single runner communicating insert 70 or a runner blocking insert 71 is disposed so as to correspond to the groove 51 a of the core mold 30 to be configured.

  Here, the configuration of the runner communication insertion piece 70 and the runner blocking insertion piece 71 is basically the same as that of the above-described embodiment, and the runner communication insertion piece 70 has a semicircular groove 70a in the center. 10 are formed on both sides thereof, and bolts 70c are inserted into the bolt holes 70b with respect to the cavity mold 20 and are fastened and fixed to the cavity mold 20, as shown in FIG. The runner communication insert piece 70 is attached and fixed to the cavity mold 20, and the groove portion 51 a of the core mold 30 and the groove portion 70 a of the runner communication insert piece 70 are combined to communicate the runner 51, which is useful as a flow path for molten resin. Available to:

  On the other hand, as shown in FIG. 11, when the runner 51 is shut off, a runner shut-off telescopic piece 71 is used. The runner blocking insert piece 71 has a semicircular ridge 71a projecting along the center so that the groove 51a of the core mold 30 can be sealed, and bolt holes 71b are formed on both sides thereof. The bolt 71c is inserted into the bolt hole 71b, and the runner cutoff insert 71 is fixed to the cavity mold 20. When the cavity mold 20 and the core mold 30 are clamped as shown in the drawing, the runner cutoff insert 71 is inserted. The protrusion 71a of the child piece 71 is fitted into the groove 51a of the core mold 30, and the runner 51 is shut off at this portion, and the supply of the molten resin is stopped.

  10 and 11, a groove 51a is formed in the core mold 30, and the runner communication insertion piece 70 and the runner blocking insertion piece 71 are bolted to the core mold 30 respectively. May be reversed. That is, the runner communicating insert 70 and the runner shut-off insert 71 are attached to the core mold 30 side, and the cavity mold 20 is provided with only a groove (not shown) for forming the runner 51. good.

  In the injection mold 10 according to the present invention, the inserter unit 60 for runner communication and the insert unit 60A for shutting off the runner share the insert piece 61 that is fastened and fixed to the core mold 30. It is also possible to integrate the child piece 61 with the core mold 30, in which case it is only necessary to selectively place the insert pieces 70 and 71 with respect to the cavity mold 20. Further, the insert pieces 70 and 71 may be attached to the core mold 30. Further, in this embodiment, the insert piece units 60 and 60A are set at one place of the runner 51. However, in a multi-cavity injection mold, the runner communication insert piece unit 60 is provided at a plurality of places of the runner 51. Further, it is more advantageous to change the molding specification by selectively arranging the runner blocking insert piece unit 60A.

It is explanatory drawing which shows the whole structure of one Example of the metal mold | die for injection molding which concerns on this invention. It is explanatory drawing which shows the arrangement configuration of the runner communication nested piece unit in the injection mold shown in FIG. It is explanatory drawing which shows the arrangement configuration of the runner intercepting insert piece unit in the injection mold shown in FIG. FIG. 3 is a perspective view showing a configuration of a runner communication telescopic unit shown in FIG. 2. FIG. 3 is a cross-sectional view showing a configuration of a runner communication telescopic unit shown in FIG. It is a perspective view which shows the structure of the insert piece unit for runner interruption | blocking shown in FIG. It is sectional drawing which shows the structure of the inserter piece unit for runner interception shown in FIG. It is a perspective view which shows the modification of the insert piece unit for runner communication which concerns on this invention. It is a perspective view which shows the structure of the modification of the nested piece unit for runner interruption | blocking which concerns on this invention. It is sectional drawing which shows the insert piece for runner communication used for the modification of the metal mold | die for injection molding which concerns on this invention. It is sectional drawing which shows the insert piece for a runner interruption | blocking used for the modification of the injection die which concerns on this invention. It is explanatory drawing which shows the conventional metal mold | die for injection molding. It is explanatory drawing which shows the structure of the insert piece unit in the conventional injection die. It is sectional drawing which shows the structure of the conventional runner communication nested piece unit. It is sectional drawing which shows the structure of the conventional insert block unit for a runner cutoff.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Injection mold 20 Cavity mold 21 Fixed side mounting plate 22 Locating ring 23 Sprue bush 24 Fixed side mold plate 30 Core type 31 Movable side mounting plate 32 Spacer block 33 Receiving plate 34 Movable side mold plate 35 Core 40 Ejector mechanism 50 Sprue 51 Runner 52 Gate 60 Runner piece for communication with runner 60A Entry piece unit for runner blocking 61 Entry piece (shared)
61a Groove 61b Bolt hole 61c Bolt 62 Insertion piece 62a Groove 62b Bolt hole 62c Bolt 63 Insertion piece 63a Projection 63b Bolt hole 63c Bolt 70 Runner communication insertion piece 70a Groove 70b Bolt hole 70c Bolt 71 Runner breaker insertion Piece 71a Convex 71b Bolt hole 71c Bolt C1, C2 Cavity

Claims (2)

A cavity mold (20) and a core mold (30), and a cavity (C1, C1 through a runner (51) and a gate (52) formed on a parting surface of the cavity mold (20) and the core mold (30). C2) An injection mold (10) for molding an injection-molded product by injecting and filling molten resin into the runner (51), a runner communicating telescopic unit (60), and a runner In the injection mold (10) in which the molding specifications are changed by selectively arranging the closing insert unit (60A),
The runner communication insert piece unit (60) is composed of insert pieces (61, 62) formed with groove portions (61a, 62a), respectively, and the runner (51) communicates with the groove portions (61a, 62a). The runner blocking insert piece unit (60A) is provided with an insert piece (61) having a groove portion (61a) and a protrusion (63a) fitted to the groove portion (61a). It is comprised from a child piece (63), and a runner (51) can be interrupted | blocked by fitting a groove part (61a) and a protruding item | line (63a), and both in the child piece unit (60, 60A) An injection mold characterized in that the telescopic piece (61) provided with the groove (61a) is shared. A cavity mold (20) and a core mold (30), and a cavity (C1, C1 through a runner (51) and a gate (52) formed on a parting surface of the cavity mold (20) and the core mold (30). C2) An injection mold (10) for molding an injection-molded product by injecting and filling molten resin into the mold, and the insert piece (70, 71) is selectively placed in the middle of the runner (51). In the injection mold (10) in which the molding specification is changed by connecting or shutting off the runner (51),
Entry piece for runner communication so that one side of the insert piece (70, 71) is configured as a runner communication insert piece (70) and the other side is configured as a runner blocking entry piece (71). (70) is formed with a groove (70a), the runner blocking insert piece (71) is formed with a ridge (71a), and each insert piece (70, 71) is formed into a cavity mold (20), If attached to either parting surface of the core mold (30), a runner (51) in which the groove (70a) of the runner communicating insert (70) is provided on the mating part parting surface. ) And the runner (51) communicate with each other, while the protrusion (71a) of the runner blocking insert piece (71) fits into the groove (51a), and the runner (51) is blocked. A mold for injection molding characterized by being made.

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