JP4084768B2 - Mold and manufacturing method thereof - Google Patents

Description

  The present invention relates to a mold such as an injection mold and a method for manufacturing the same.

  For an injection molding machine or the like used for molding a resin or the like, for example, a molding die such as a mold including a fixed die and a movable die is used. Such a mold is provided with a mold cooling (temperature adjustment) mechanism in order to solidify the molten resin filled (injected) into a cavity formed between the fixed mold and the movable mold. . In order to solidify the molten resin in the cavity quickly and uniformly, for example, (1) the number and arrangement positions of cooling passages (die temperature adjusting passages) provided along the mating surfaces and the mold material ( Various attempts have been made to devise materials etc., and (2) to manage and control the temperature, flow rate, etc. of cooling water (refrigerant) (see Patent Documents 1 and 2).

Japanese Patent No. 3072217 Japanese Patent No. 3316883

But,
(1) Since the cooling passage is generally drilled with a drill or the like, it is often formed in a straight line in each of the fixed mold and the movable mold, and there is a design and manufacturing limit in arrangement;
(2) There is a limit due to the rated capacity / number of pumps and a flow rate (water pressure) limit to prevent water leakage from the connection;
For these reasons, as the shape of the molded product (that is, the cavity) becomes complicated, the mold temperature in the cooling process tends to be uneven and high. This causes a partial or temporal variation in the solidification of the molded product, and (a) due to deformation / deterioration of dimensional accuracy of the molded product when solidifying, or due to deformation / damage of the molded product when protruding, Product yield decreases, or (b) production efficiency decreases due to a longer molding cycle.

  An object of the present invention is to provide a molding die capable of uniformizing solidification of a molded product by devising an arrangement position and a molding method of a mold temperature adjusting passage, and to improve product yield and production efficiency, and a manufacturing method thereof. Is to provide.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the mold according to the present invention is:
By moving the movable mold closer to the fixed mold, they are in contact with each other at the mating surface and a cavity is formed between them,
The mold temperature adjusting passage includes a through passage formed through the mating surface and straddling the fixed mold and the movable mold.

  According to such a molding die, when the molded product is solidified by the mold temperature adjusting medium (cooling medium or heating medium) that flows through the through passage formed through the mating surface and straddling the fixed mold and the movable mold. Positional or temporal variations are less likely to occur. At that time, elimination of the temperature difference near the boundary (mating surface) between the fixed mold and the movable mold, and heat extraction (heat conduction) at the part where the retained heat of molten resin etc. tends to accumulate due to the shape of the cavity (molded product) Can be improved. In particular, the through-passage passes through the mating surface, and the mold temperature control medium flowing through the through-passage does not come into direct contact with the molten resin in the cavity. ) Is unlikely to occur. Therefore, even if the shape of the molded product becomes complicated, it is possible to suppress a decrease in product yield due to deformation of the molded product and a decrease in production efficiency due to a prolonged molding cycle.

  In such a mold, at least one of the fixed mold and the movable mold is integrally formed by laminating a plurality of layered bodies having a cross section parallel to the mating surface, and the layered body forms a cavity. It is desirable to include a cavity wall portion and a through passage wall portion constituting the through passage. As a result, even when the cavity (molded product) has a complicated three-dimensional shape, the through-passage (temperature control piping) can be accurately incorporated at the most effective position for mold temperature control, and the molded product can be solidified. This can contribute to the improvement of product yield and production efficiency.

  Specifically, the through-passage wall portion is formed in a layered body in a form in which the periphery is surrounded by the cavity wall portion except for a local opening. As a result, a confined narrow space is formed so that the retained heat of the molten resin or the like is most likely to accumulate (for example, an umbrella-shaped (or mushroom-shaped, skirt-shaped) portion, an interdigital shape (or a blind shape, a curtain shape) It is easy to improve the heat sinking (heat conduction) in the cavity having the portion.

  A representative example of the “molding die” according to the present invention is an injection molding die (see Patent Document 1) in which a cavity die (female die) is a fixed die and a core die (male die) is a movable die, or one of them is fixed. This is an injection mold (see Patent Document 2) composed of a pair of split molds having a mold and the other as a movable mold. However, “molding die” includes molding methods other than injection molding (for example, compression molding, transfer molding, etc.), and molding materials other than metal used for molding materials other than plastic (for example, glass) (for example, rubber). , Plastic, etc.). Note that the “die temperature adjusting passage” is usually a cooling passage, but depending on the molding material, it is necessary to maintain the mold (die) at a high temperature in order to improve crystallinity. It also has a function as

Further, in order to solve the above problems, a molding die for injection molding according to the present invention is:
A mold for injection molding in which a movable mold is moved closer to a fixed mold so that they are clamped at a mating surface and a cavity is formed between them.
A cooling passage as a mold temperature adjusting passage includes a through passage formed through the mating surface and straddling the fixed mold and the movable mold,
The refrigerant flowing through the through passage is sucked and discharged from the cooling passage on at least one of the fixed type and the movable type.

  According to such a mold for injection molding, even if the through passage is formed across the mating surface and straddling the fixed mold and the movable mold, the refrigerant flowing through the mold does not jet from the mating surface. Therefore, since it is not necessary to perform sealing processing such as an O-ring, packing, and resin coating layer on the through passages of the mating surfaces, the structure is simple and inexpensive, and the occurrence of rust due to refrigerant leakage can be prevented. Note that a cooling liquid such as cooling water or a cooling gas such as cooling air can be used as the refrigerant. Further, the through passage may be connected to either a fixed type or a movable type cooling passage, and can be connected to the cooling passage in either a serial or parallel manner. Further, the through passage may be connected as a bypass passage over the fixed and movable cooling passages.

  Specifically, the coolant flowing in the cooling passage is cooling water, and the cooling water is discharged from the cooling passage on one side of the fixed type and the movable type by a negative pressure pump together with the outside air sucked into the through passage from the mating surface. It is desirable to be sucked out. In this case, since it is not necessary to pump the cooling water, the burden on the pump (and the drive motor) can be reduced, and the cooling efficiency is improved by sucking outside air.

Furthermore, in order to solve the said subject, the manufacturing method of the shaping | molding die which concerns on this invention is the following.
A cavity wall portion that is intended to form a cavity formed between each of the plurality of layered bodies having a cross section parallel to a reference plane including a mating surface of the fixed mold and the movable mold, and the mating surface And a through-passage wall part that is planned to form a through-passage that penetrates the
The plurality of layered bodies are laminated and integrated, and at least one of the fixed mold and the movable mold is formed.

  According to such a mold manufacturing method, a cavity wall portion and a through-passage wall portion can be integrally formed in a slice-like (thin film-like) layered body in one step, and a plurality of layered bodies are laminated and integrated. As a result, a molding die having a cavity and a through passage can be formed, so that the time required for molding can be shortened.

Here, specifically, the following method can be adopted as the laminated integrated molding method in the present invention.
(1) Method of melting / curing hot melt curable material ... A hot melt curable material (for example, metal powder) is uniformly spread on the plate in a layered form with a predetermined thickness, and a laser beam or the like is formed in a cavity cross-sectional shape and through passage. Irradiation along a cross-sectional shape is a molding method in which an irradiation site forms a layered body that is heat-melt-cured, and at the same time, the layered bodies adjacent to each other by the irradiation are laminated and integrated (Japanese Patent Publication No. 6-98687, (See Japanese Patent No. 2620353).
(2) Method by curing photocurable substance: Put a photocurable fluid (eg, photocurable resin solution) into the container, and let the light beam from a light source such as a mercury lamp follow the cross-sectional shape of the cavity and the through-passage. Irradiation to form a layered body in which the irradiated part is photocured, and at the same time, the layered bodies adjacent to each other are laminated and integrated by the irradiation (Japanese Patent Publication No. 6-24773, Japanese Patent Publication No. 7-57531). Issue gazette).
(3) Method of cutting and laminating sheet-like substances: placing a sheet-like substance (for example, a metal sheet material) of a predetermined thickness on a plate and passing a laser beam etc. along the cavity cross-sectional shape and the through-passage cross-sectional shape This is a molding method in which a layered body cut by irradiation is formed, and a plurality of layered bodies are laminated and integrated (see JP-A-8-318535).

  In addition, “simultaneously forming the cavity wall portion and the through-passage wall portion” means that the cavity wall portion and the through-passage wall portion are formed (together) in the layered body forming step. Therefore, for example, in addition to a method in which two laser transmitters are operated simultaneously and both wall portions are melted and melted at once, one wall portion and then the other wall portion are sequentially melted by one laser transmitter. A curing method may be used. In addition, “stacked integration of a plurality of layered bodies” includes a method of integrating adjacent layered bodies in parallel with the simultaneous integration of both wall portions, and a plurality of layered bodies ( For example, a sheet-like substance) may be formed in advance, and adjacent layered bodies may be integrated one after another or all layered bodies may be integrated together.

  In such a mold manufacturing method, the layered body on the fixed mold side and the layered body on the movable mold side have the same thickness at equal distances from the reference plane, respectively, and the cavity wall portion and the through passage The wall part is formed at the same time, and a plurality of layered bodies are laminated and integrated, and the fixed mold and the movable mold are formed in the form of simultaneous progression. Symmetric cavities may be formed. By molding a fixed mold and a movable mold having a cavity symmetric with respect to the reference plane in the form of simultaneous progress, the time required for molding can be further greatly reduced, and the control for molding is simplified. .

(Example)
Next, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a front sectional view and a right side view showing an injection molding machine using an injection mold which is an embodiment of a molding die according to the present invention. This injection molding machine 100 manufactures molded articles such as resin parts for automobiles using an injection mold 10 (molding mold; hereinafter simply referred to as a mold). An injection molding machine 100 shown in FIG. 1 includes a mold clamping device 20 that opens and closes a mold 10 and clamps and fixes the mold 10 at high pressure, and a mold 13 such as a synthetic resin, and a cavity 13 (cavity) of the mold 10 is melted. And a cooling device 40 for cooling and solidifying the molten resin or the like in the cavity 13 by circulating cooling the cooling water (refrigerant; mold temperature adjusting medium) in the mold 10. A mold temperature adjusting device) and a protruding device 50 for taking out a resin molded product or the like that has entered the cavity 13 and has been cooled and solidified.

  In FIG. 1, the mold 10 is divided into a fixed mold 11 located on the upper side and a movable mold 12 located on the lower side in the figure, and when the fixed mold 11 and the movable mold 12 are closed by the mating surface PL, A cavity 13 which is a space filled (injected) with molten resin is formed. In this embodiment, the cavity 13 is formed in both molds 11 and 12 as a fixed side cavity 131 and a movable side cavity 132 having a symmetric shape with respect to the reference plane S including the mating surface PL. The split mold) and the movable mold 12 (second split mold) constitute a pair of split molds (mold 10). The fixed die 11 is further attached to a fixed attachment plate 15 (fixed to a fixed die plate (not shown) of the injection molding machine 100) positioned above the fixed die 11, and the movable die 12 is further below the fixed die 11. It is attached to the receiving plate 16 located. Further, the receiving plate 16 is connected to the mold clamping device 20 so as to be close to and away from the fixed side mounting plate 15 in the vertical direction (vertical direction). The fixed mold 11 and the movable mold 12 are respectively formed with guide portions 11a and 12a for closing with the mating surface PL. In this embodiment, the guide convex portions 11a provided at the four corners of the fixed mold 11 and It is comprised from the guide recessed part 12a provided in the four corners of the movable mold | type 12 (refer FIG. 4, FIG. 5).

  The mold clamping device 20 includes a plurality of (for example, two; see FIG. 4) implantation bolts 21 (fastening members) fixed at one end to the receiving plate 16 and a toggle link mechanism connected to the other end of the implantation bolt 21. And a tightening portion 22. The injection device 30 includes a hopper 31 for storing a molding material such as a resin, a cylinder 32 for storing a molten resin obtained by heating and melting the molding material, and a screw 33 for feeding the molten resin into the cavity 13 in the cylinder 32. have. On the other hand, a locating ring 17 is fixed to the fixed side mounting plate 15, and a well type sprue bush 18 that opens a pinpoint gate 18 a communicating with the cavity 13 is fitted and fixed to the locating ring 17. At the time of injection molding, the nozzle 32 a at the tip of the cylinder 32 is inserted into the sprue bush 18, and the molten resin in the cylinder 32 is sent into the cavity 13 by the screw 33.

  The cooling device 40 includes cooling passages 41 and 42 (die temperature control passages; temperature control pipes) each having a circular cross section formed inside the fixed mold 11 and the movable mold 12 for flowing cooling water, and a fixed mold. 11 and a negative pressure pump 43 (suction pump, decompression pump) for sucking and discharging cooling water from the cooling passages 41 and 42 of the movable mold 12. The negative pressure pump 43 is provided with an electric motor 43a (pump driving means) for driving. Reference numeral 44 denotes a check valve for preventing a reverse flow of the cooling water from the negative pressure pump 43 to the cooling passages 41 and 42, and 45 denotes a cooling water storage tank (see FIG. 2).

  The protruding device 50 protrudes below the receiving plate 16 and protrudes into the cavity 13, an upper ejector plate 51 positioned via a gap corresponding to the stroke L, a lower ejector plate 52 attached to the lower surface of the upper ejector plate 51, and Thus, a protruding mechanism 53 for taking out the molded product M is provided. The protruding mechanism 53 includes a plurality of (for example, six; see FIG. 4) eject pins 53a, a plurality of (for example, two; see FIG. 4) eject stopper pins 53b, and a plurality (for example, two; see FIG. 4). Return spring 53c (urging member; elastic member) and a pressing portion (not shown) for pressing the lower ejector plate 52 upward.

  Among them, the eject pin 53a is fixed at the base end to the upper ejector plate 51, the tip coincides with the lower edge of the cavity 13 at the time of mold clamping or the like, closes the cavity 13, and the tip when the molded product M is taken out. Penetrates the receiving plate 16 and the movable mold 12 and enters the cavity 13. The eject stopper pin 53b is fixed at the base end to the upper ejector plate 51, and when the molded product M is taken out, the distal end may penetrate the receiving plate 16 and the movable mold 12 and come into contact with the mating surface PL of the fixed mold 11. is there. The return spring 53c is configured by a compression coil spring or the like fitted on the stud bolt 21 so as to maintain a protruding stroke L between the receiving plate 16 and the upper ejector plate 51. Therefore, the return spring 53c has a function of crimping the fixed mold 11 and the movable mold 12 with the mating surface PL at the time of mold clamping or the like, and when the molded product M is taken out, it is compressed by the upper ejector plate 51 and ejected. The pin 53a and the eject stopper pin 53b are pushed upward.

  FIG. 2 shows the internal structure of a mold 10 composed of such a split movable mold 12 and fixed mold 11, and FIG. 3 shows a molded product M injection-molded using the mold 10 of FIG. ing. FIG. 4 is a plan view of the movable mold 12, and FIG. 5 is a bottom view of the fixed mold 11. Note that the fixed mold 11 in FIG. 5 is inverted by 180 ° centering on the line segment X1-Y1, and the mating surface is such that the point X2 and the point X1, and the point Y2 and the point Y1 coincide with the movable mold 12 in FIG. FIG. 2 shows a state where PL and PL face each other (face-to-face).

  As described above, the cavity 13 shown in FIG. 2 includes the fixed-side cavity 131 and the movable-side cavity 132 that have a symmetrical shape with respect to the reference plane S including the mating surface PL of the fixed mold 11 and the movable mold 12. The Specifically, the cavity 13 has a flat plate-like base portion 13b having a predetermined thickness in the depth direction (front-rear direction) and extending in the horizontal direction (left-right direction) longer than the vertical direction (up-down direction); A base portion 13b that bifurcates at the top portion 13t formed in a truncated cone shape at the tip of the handle portion 13s, and a zenith portion 13t that protrudes forward from the lateral central portion of the base portion 13b. Umbrella-shaped portion 13c (cap-shaped portion; mushroom-shaped portion) that opens in a divergent shape toward the bottom, and skirt portion 13f that protrudes in the vertical direction (vertical direction) in parallel with base portion 13b at the tip of each umbrella-shaped portion 13c Are integrally formed. In addition, the periphery of the mating surface PL of the fixed mold 11 and the movable mold 12 is formed in a rectangular shape having a long side in the longitudinal direction of the cavity 13 (base portion 13b) (see FIGS. 4 and 5).

  Therefore, the molded product M formed by filling the cavity 13 with the molten resin also has a symmetric form with respect to the reference plane S, as shown in FIG. The handle portion Ms, the zenith portion Mt, the umbrella-like portion Mc, and the skirt portion Mf are integrally formed in the same shape as the cavity 13.

  Returning to FIG. 2, the fixed-side cooling passage 41 piped to the fixed mold 11 is formed in a form that continuously surrounds the periphery of the fixed-side cavity 131 substantially parallel to the mating surface PL (reference plane S). A side circulation passage 41R is provided. The fixed-side circulation passage 41R connected to the inlet-side plug 41i provided on one end side in the longitudinal direction (right side in FIGS. 1 and 2) of the fixed-side mounting plate 15 (see FIG. 1) is a fixed die 11 (fixed-side cavity). 131) includes a rear portion 41b that extends rearward of the base portion 13b along the upper edge in the lateral direction (the other end in the longitudinal direction) (see FIGS. 1 and 5). Further, the fixed-side circulation passage 41R includes a reversing portion 41e that bypasses the outside of the base portion 13b and changes its direction, and a front portion that continues in the reverse direction in the lateral direction along the upper edge following the reversing portion 41e. 41f. The end of the front portion 41f is connected to an outlet side plug 41o provided on one end side in the longitudinal direction of the fixed side mounting plate 15. Further, in the front portion 41f, a front side semicircular portion 41c2 that detours the front outer side of each portion of the handle portion 13s, the zenith portion 13t, the umbrella-like portion 13c, and the skirt portion 13f as a front protrusion portion in a semicircular shape is formed, A rear-side semicircle portion 41c1 is also formed in the rear portion 41b so as to correspond to the front-side semicircle portion 41c2.

  Therefore, the cooling water that has flowed into the fixed-side circulation passage 41R from the inlet-side plug 41i is the rear part 41b → the rear semicircle part 41c1 → the rear part 41b → the reversing part 41e → the front part 41f → the front semicircle part 41c2 → the front. It is sucked and discharged by the negative pressure pump 43 from the outlet side plug 41o through the portion 41f.

  On the other hand, the movable-side cooling passage 42 piped to the movable die 12 is a movable-side circulation passage formed in a form that continuously surrounds the periphery of the movable-side cavity 132 substantially in parallel with the mating surface PL (reference plane S). 42R. The movable-side circulation passage 42R extends from the inlet-side plug 42i provided on one end side (right side in FIG. 2) in the longitudinal direction of the movable mold 12 (movable-side cavity 132) to the lower front side of the base portion 13b of the movable-side cavity 132. It includes a front portion 42f that goes in the direction (the other end in the longitudinal direction) (see FIGS. 1 and 4). Furthermore, the movable side circulation passage 42R includes a reversing portion 42e that changes direction below the other end side of the base portion 13b, and a rearward lower portion of the base portion 13b following the reversing portion 42e in the lateral direction and toward one end in the longitudinal direction. And a rear portion 42b reaching the outlet-side plug 42o provided. Further, in the front portion 42f, a front-side semicircular portion 42c that detours the front outer side of each portion of the handle portion 13s, the zenith portion 13t, the umbrella-like portion 13c, and the skirt portion 13f as a front protrusion portion in a semicircular shape is formed. Yes. In addition, the rear side semicircle part corresponding to the front side semicircle part 42c is not formed in the rear part 42b.

  In the movable side circulation passage 42R, the central portion in the lateral direction of the rear portion 42b (the portion corresponding to the front semicircle portion 42c) is parallel to the internal space of the front semicircle portion 42c below the base portion 13b. Protruding portions 42p and 42p are formed to enter (see FIG. 4). Further, a through passage 42T that rises upward from the tip of the parallel projecting portions 42p, 42p of the movable side circulation passage 42R and connects in a gate shape penetrates the mating surface PL of the fixed mold 11 and the movable mold 12 and is fixed. It is connected and formed so as to reach the mold 11 (see FIGS. 1A, 4 and 5). The upright portions 42s and 42s of the portal-shaped through passage 42T are triangular wall portions (or triangular shapes) of the movable mold 12 surrounded by the base portion 13b, the handle portion 13s, the umbrella-like portion 13c, and the skirt portion 13f of the cavity 13. The upper ends thereof are connected to horizontal connecting portions 42j having substantially the same height as the rear portion 41b, the front portion 41f, and the like of the fixed side circulation passage 41R.

  Therefore, the cooling water flowing into the movable side circulation passage 42R from the inlet side plug 42i is forward part 42f → front side semicircular part 42c → front part 42f → reversing part 42e → rear part 42b → protrusion part 42p → through passage 42T ( Upright portion 42s → connecting portion 42j → standing portion 42s) → protruding portion 42p → rear portion 42b and the outside air sucked into the through passage 42T from the mating surface PL and sucked and discharged from the outlet side plug 42o by the negative pressure pump 43. The As a result, the retained heat of the molten resin in the cavity 13 confined by the base portion 13b, the handle portion 13s, the umbrella-like portion 13c, and the skirt portion 13f is efficiently transferred to the cooling water flowing through the through passage 42T. In addition, since the internal diameter of the protrusion part 42p and the through-passage 42T is set smaller than the internal diameter of the other movable side circulation path 42R, the flow velocity of the cooling water flowing through the through-passage 42T becomes relatively high.

  As described above, the cooling passages 41 and 42 are formed in the fixed mold 11 and the movable mold 12 so as to substantially overlap with each other in plan view, and the flow direction of the cooling water between the fixed-side circulation path 41R and the movable-side circulation path 42R. Therefore, the molten resin in the cavity 13 is easily cooled and solidified uniformly as a whole. Moreover, since the through-passage 42T passing through the mating surface PL and reaching the fixed mold 11 is connected in series to the movable-side circulation passage 42R, the degree of freedom of the cooling pipe is increased and the cooling efficiency is improved. When the through passage 42T passes through the portion of the cavity 13 surrounded by the base portion 13b, the handle portion 13s, the umbrella-like portion 13c, and the skirt portion 13f, the heat retained by the molten resin in the cavity 13 is likely to accumulate. The heat drawn from this part becomes good. In addition, since the rear semicircular portion 41c1 is formed in order to keep the fixed side circulation passage 41R corresponding to the arrangement position of the through passage 42T away from the base portion 13b, the cooling effect by the through passage 42T is improved. However, excessive cooling of the central portion in the lateral direction of the base portion 13b is prevented. Therefore, the entire molded product M is cooled and solidified in a well-balanced manner, and deformation such as warping and bending of the base portion Mb is reduced.

  As shown in FIG. 4, the eject pins 53a are provided at three locations, both at the lateral ends and the central portion from below the base portion 13b, at two locations from below the bottom portions 13f, and at one location from below the zenith portion 13t. Thus, it is possible to enter the movable side cavity 132 at a total of six locations. Further, the eject stopper pin 53b can abut on the mating surface PL of the fixed die 11 at two locations from below at the center position in the thickness direction of the base portion 13b (that is, the center position in the depth direction of the mold 10). . Furthermore, the eject stopper pin 53b and the return spring 53c (planting bolt 21) are provided at two points that are symmetric with respect to the center position of the nozzle 32a at the tip of the cylinder 32, respectively.

  By the way, as shown in FIG. 1, the center position of the nozzle 32a (gate 18a) at the tip of the cylinder 32 is changed from the center position of the eject pin 53a located at the lateral center of the base section 13b (cavity 13) to the base section 13b. Are shifted (separated; offset) by a predetermined separation distance W (for example, 2 mm) on the center line in the thickness direction. Since the center position of the nozzle 32a and the center position of the eject pin 53a are displaced by a distance W, when the eject pin 53a is inserted into the cavity 13 and the molded product M is protruded, cooling and solidification is performed in the cavity 13. The obtained resin is easily separated from the resin in the gate 18a (sprue bush 18). Thus, continuous molding can be performed while the nozzle 32 a is connected to the sprue bushing 18.

  Next, the manufacturing method of the metal mold | die 10 demonstrated above is demonstrated. FIG. 6 shows movable side layered bodies 112a,..., 112n for manufacturing the movable mold 12, and FIG. 7 shows fixed side layered bodies 111a,. In this embodiment, the movable side layered bodies 112a,..., 112n in FIG. 6 and the fixed side layered bodies 111a,. Irradiating a laser beam or the like to form a layered body in which the irradiated part is heat-melted and hardened, and at the same time, a "molding method in which layered bodies adjacent to each other are laminated and integrated"・ The molding method by curing ”is used. Since the molding method principle is described in Japanese Patent Publication No. 6-98687, Japanese Patent No. 2620353, etc., the description thereof is omitted here.

  As shown in FIG. 6, the movable mold 12 is composed of a plurality of movable side layered bodies 112a,..., 112n having a cross section parallel to the mating surface PL (reference plane S; see FIG. 2). 112a,..., 112n are manufactured by a laminated integrated molding method in which they are integrally formed by laminating and fixing. At this time, the movable side layered body 112a that forms a portion of the movable mold 12 that is close to the mating surface PL (reference plane S) has a cavity wall that constitutes a part of the movable side cavity 132. The part 132a and the through-passage wall part 42Ta that constitutes a part of the through-passage 42T that penetrates the mating surface PL are formed integrally at the same time. Specifically, as the cavity wall portion 132a, a base wall portion 113b and a handle wall portion 113s that constitute each part of the base portion 13b, the handle portion 13s, the zenith portion 13t, the umbrella-like portion 13c, and the skirt portion 13f. -The zenith wall part 113t, the umbrella-like wall part 113c, and the skirt wall part 113f are included. Further, the penetrating passage wall portion 42Ta includes a standing wall portion 142s that constitutes a part of the standing portion 42s. Here, “simultaneous formation of the cavity wall portion 132a and the through-passage wall portion 42Ta” uses a single laser transmitter to heat and melt the cavity wall portion 132a first and then the through-passage wall portion 42Ta sequentially. This is achieved by forming by curing. The through-passage wall portion 42Ta (the standing wall portion 142s) is surrounded by each wall portion constituting the cavity wall portion 132a except for a local opening between the base wall portion 113b and the bottom wall portion 113f. In this manner, the movable side layered body 112a is formed.

  On the other hand, in the movable mold 12, the movable side layered body 112 n that forms a part separated from the mating surface PL (reference plane S) has one of the movable side circulation passages 42 R surrounding the movable side cavity 132. The movable-side circumferential passage wall 42Rn constituting the part and the through-passage wall 42Tn constituting a part of the through-passage 42T penetrating the mating surface PL are integrally formed at the same time. Specifically, as the movable-side circulation passage wall portion 42Rn, each of the inlet-side plug 42i, the front portion 42f, the front-side semicircular portion 42c, the reversing portion 42e, the rear portion 42b, the protruding portion 42p, and the outlet-side plug 42o. The inlet side plug wall part 142i, the front wall part 142f, the front side semicircular wall part 142c, the reverse wall part 142e, the rear wall part 142b, the protruding wall part 142p, and the outlet side plug wall part 42o are included. . Further, the penetrating passage wall portion 42Tn includes a standing wall portion 142s that constitutes a part of the standing portion 42s. Here, the “simultaneous formation of the movable-side circulation passage wall 42Rn and the through-passage wall portion 42Tn” means that the movable-side circulation passage wall 42Rn is first used, and then the through-passage wall portion using one laser transmitter. It is achieved by forming 42Tn by sequential hot melt curing.

  In the movable side layered body 112a, a stopper pin hole wall portion 153b for allowing the eject stopper pin 53b to pass through is simultaneously formed integrally with the cavity wall portion 132a and the through-passage wall portion 42Ta. In addition, the movable side layered body 112n is provided with a stopper side hole wall portion 153b and an eject pin hole wall portion 153a for allowing the eject pin 53a to pass along with the movable side circulation passage wall portion 42Rn and the through passage wall portion 42Tn. It is integrally formed.

  As shown in FIG. 7, the fixed die 11 is composed of a plurality of fixed side layered bodies 111a,..., 111n having a cross section parallel to the mating surface PL (reference plane S; see FIG. 2). The layered bodies 111a,..., 111n are manufactured by a laminated integrated molding method in which the layered bodies 111a,. At that time, in the fixed mold 11, a cavity wall that forms a part of the fixed side cavity 131 is formed in the fixed side layered body 111 a that forms a part close to the mating surface PL (reference plane S). The part 131a and the through-passage wall part 42Ta that constitutes a part of the through-passage 42T that penetrates the mating surface PL are formed integrally at the same time. Specifically, as the cavity wall portion 131a, a base wall portion 113b and a handle wall portion 113s that constitute a part of each of the base portion 13b, the handle portion 13s, the zenith portion 13t, the umbrella-like portion 13c, and the skirt portion 13f. -The zenith wall part 113t, the umbrella-like wall part 113c, and the skirt wall part 113f are included. Further, the penetrating passage wall portion 42Ta includes a standing wall portion 142s that constitutes a part of the standing portion 42s. Here, "simultaneous formation of the cavity wall 131a and the through-passage wall 42Ta" uses a single laser transmitter to heat and melt the cavity wall 131a and then the through-passage wall 42Ta sequentially. This is achieved by forming by curing. The through-passage wall portion 42Ta (the standing wall portion 142s) is surrounded by each wall portion constituting the cavity wall portion 131a except for a local opening between the base wall portion 113b and the bottom wall portion 113f. The fixed-side layered body 111a is formed in such a form.

  On the other hand, in the fixed mold 11, the fixed side layered body 111 n that forms a part separated from the mating surface PL (reference plane S) has a cavity wall portion that constitutes a part of the fixed side cavity 131. 131a, a fixed-side circulation passage wall 41Rn that forms a part of the fixed-side circulation passage 41R that surrounds the periphery of the fixed-side cavity 131, and a part of the through-passage 42T that penetrates the mating surface PL. A different through-passage wall 42Tn is formed integrally at the same time. Specifically, a base wall portion 113b that constitutes a part of the base portion 13b is included as the cavity wall portion 131a. Further, as the fixed-side circulation passage wall portion 41Rn, the rear wall portion 141b that constitutes a part of each of the rear portion 41b, the rear-side semicircle portion 41c1, the reversing portion 41e, the front portion 41f, and the front-side semicircle portion 41c2. The rear side semicircular wall part 141c1, the inversion wall part 141e, the front wall part 141f, and the front side semicircular wall part 141c2 are included. Further, the through-passage wall portion 42Tn includes a connecting wall portion 142j that constitutes a part of the connecting portion 42j. Here, “simultaneous integral formation of the cavity wall 131a, the fixed-side circulation passage wall 41Rn, and the through-passage wall 42Tn” uses a single laser transmitter to first define the cavity wall 131a and then the fixed-side This is achieved by forming the circulation passage wall portion 41Rn and subsequently the through passage wall portion 42Tn by sequentially heat melting and hardening.

  Further, in the manufacturing method of the movable mold 12 and the fixed mold 11, the movable side layered bodies 112a,... And the fixed side layered bodies 111a,... Have the same thickness with an equal distance from the reference plane S, respectively. The cavity wall portions 132a and 131a and the through-passage wall portion 42Ta are integrally formed at the same time. Then, the two sets of layered bodies 112a,..., 112n and 111a,..., 111n are laminated and integrated, and the movable mold 12 and the fixed mold 11 are formed in the form of simultaneous progress. That is, when the movable mold 12 and the fixed mold 11 are a pair of split molds in which the movable cavity 132 and the stationary cavity 131 are formed in a symmetric form with respect to the reference plane S including the mating surface PL, The molding time can be shortened by simultaneously operating two laser transmitters dedicated to molding the mold 12 and the fixed mold 11. Further, if the distance from the reference plane S between the movable side circulation path 42R and the fixed side circulation path 41R is made equal, and the vertical thicknesses of the movable mold 12 and the fixed mold 11 are made equal, the movable mold 12 and the fixed mold 11 moldings can be started simultaneously and ended simultaneously based on the same control content (control program).

Next, an outline of a method (injection molding method) for producing a molded product M by the injection molding machine 100 using the mold 10 thus produced will be described with reference to FIG.
(1) Mold Clamping Process By operating the clamping part 22 of the mold clamping device 20, the movable mold 12 (receiving plate 16) is moved closer to the fixed mold 11 (fixed side mounting plate 15) and closed by the mating surface PL. Then, the mold 10 is clamped with a predetermined clamping force.
(2) Nozzle touch process The nozzle 32a of the injection device 30 is inserted and fixed to the sprue bushing 18 of the fixed side mounting plate 15. The nozzle 32a can be continuously formed while being connected to the sprue bushing 18.
(3) Injection process The screw 33 of the injection device 30 is rotated to feed the molten resin in the cylinder 32 into the cavity 13 with a predetermined injection pressure.
(4) Cooling step By operating the cooling device 40, cooling water is circulated through the cooling passages 41 and 42 of the fixed mold 11 and the movable mold 12, and the molten resin in the cavity 13 is cooled and solidified.
(5) Mold opening process The movable mold 12 (receiving plate 16) is moved away from the fixed mold 11 (fixed side mounting plate 15) by operating the clamping portion 22 of the mold clamping device 20 in the opposite direction to the mold clamping process. And the mold 10 is separated.
(6) Protrusion step By operating the pressing portion of the protrusion device 50, the upper ejector plate 51 (lower ejector plate 52) protrudes against the elastic force of the return spring 53c, and is pressed and moved upward over the stroke L. The tip of the eject pin 53a enters the cavity 13 and the molded product M is taken out. When the pressing portion is operated in the reverse direction to release the pressing force, the upper ejector plate 51 (lower ejector plate 52) moves downward by the elastic force of the return spring 53c, and the eject pin 53a returns to its original position.

(Modification)
A modification of the mold in FIG. 2 is shown in FIG. The mold 210 in FIG. 8A is composed of a fixed mold 211 as a female mold (cavity mold) and a movable mold 212 as a male mold (core mold). In this case, when the fixed mold 211 and the movable mold 212 are closed by the mating surface PL, a plurality of reference planes including the mating surface PL are formed vertically (for example, two surfaces), and the cavity 213 includes the upper reference plane S1 and the lower reference plane. It is formed between the plane S2.

  The cavity 213 is integrally formed with a top plate portion 213t extending in the lateral direction (left-right direction) and a plurality of (for example, four) leg portions 213f protruding downward from the top plate portion 213t, and the top plate between the leg portions 213f. Through holes 213h are formed in the portions 213t, respectively. Therefore, the molded product N formed by filling the cavity 213 with the molten resin is also integrated with the top plate portion Nt, the leg portion Nf, and the through hole Nh in the same shape as the cavity 213 as shown in FIG. Formed.

  Inside the mold 210 shown in FIG. 8 (a), a cooling passage 241 (die temperature adjusting passage; temperature) having a circular cross section in order to allow cooling water to flow from the movable die 212 to the fixed die 211 in the cooling device 240. Regulating piping) is formed. Each of the cooling passages 241 includes a circulation passage 241R and a penetration passage 241T that are formed through the mating surface PL and straddle the fixed die 211 and the movable die 212. Specifically, the circulation path 241R continuously surrounds the periphery of the cavity 213 along the mating surface PL, and forms a single loop that penetrates the mating surface PL (lower reference plane S2) outside the cavity 213. Is formed. Further, the through passage 241T branches from the circulation passage 241R in the movable die 212 and penetrates the mating surface PL (the lower reference plane S2 and the upper reference plane S1), passes through the through hole 213h of the cavity 213, and enters the fixed die 211. It is formed in parallel as a plurality of (for example, three) bypass passages that merge with the circulation passage 241R. In FIG. 8A, parts having the same functions as those in FIG.

  Therefore, the cooling water that has flowed into the circulation passage 241R in the movable mold 212 passes through the mating surface PL (lower reference plane S2) outside the cavity 213, and flows out of the circulation passage 241R in the fixed mold 211. At this time, the through passage 241T branched from the circulation passage 241R in the movable mold 212 passes through the mating surface PL (the lower reference plane S2 and the upper reference plane S1) and joins the circulation passage 241R in the fixed mold 211. As a result, the retained heat of the molten resin in the cavity 213 confined by the top plate portion 213t and the leg portion 213f is efficiently transferred to the cooling water flowing through the through passage 241T. Since the inner diameter of the through passage 241T is set smaller than the inner diameter of the circulation passage 241R, the flow rate of the cooling water flowing through the through passage 241T is relatively high.

  Such a mold 210 is also laminated and integrated by the above-described “molding method by melting and curing a hot-melt curable substance”. For example, as shown in FIG. 8 (b), the movable side layered body 312a, which forms a portion of the movable mold 212 close to the mating surface PL (lower reference plane S2), has a cavity 213 (leg portion). 213f) and the cavity wall portion 213a (leg wall portion 313f) that constitutes a part of the cavity and the through-passage wall portion 241Ta that constitutes a part of the penetration path 241T that penetrates the mating surface PL are integrated simultaneously. It is formed. The circular passage 241R and the through passage 241T formed in the movable mold 212 and the fixed mold 211 can also be formed by drilling such as a drill as in the prior art.

  Next, a modification of the cooling pipe of FIG. 8A is shown in FIG. In the cooling device 440 of FIG. 9, in order to pump the cooling water flowing through the cooling passage 241 (circulation passage 241R and through passage 241T), a pressure feed pump 443 and an electric motor 443a are provided on the inlet side to the circulation passage 241R in the movable mold 212. (Pump driving means) and a check valve 444 is provided on the outlet side from the circulation passage 241R in the fixed die 211. However, in order to prevent cooling water from leaking from the through passage 241T that penetrates the mating surface PL (upper reference plane S1), the mating surface PL of the movable mold 212 and the fixed mold 211 has an O-ring, packing, and resin coating. A sealing material 446 such as a layer is interposed. Further, in order to prevent cooling water from leaking from the circulating passage 241R that penetrates the mating surface PL (lower reference plane S2), the mating surface PL of the movable mold 212 and the fixed mold 211 has an O-ring, packing, and resin coating. A sealing material 447 such as a layer is interposed. In FIG. 9, parts having the same functions as those in FIG.

In addition to the above, the following modifications are possible.
(1) Although only the case where the through passage 42R is arranged in one place in series with the movable side cooling passage 42 has been described, for example, the through passage 42R may be arranged in parallel with the fixed side cooling passage 41 at a plurality of places. Good. Alternatively, the through passage 42 </ b> R may be disposed as a bypass passage straddling the movable side cooling passage 42 and the fixed side cooling passage 41.
(2) Although only the case where one molded product M is manufactured from the mold 10 has been described, a plurality of molded products M may be used.
(3) A pressure-type cooling device as shown in FIG. 9 may be applied to the embodiment shown in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view and a right side view showing an injection molding machine using an injection mold that is an embodiment of a molding die according to the present invention. The perspective perspective view which shows the internal structure of the metal mold | die of FIG. The perspective view of the molded article injection-molded using the metal mold | die of FIG. The top view of a movable type. The bottom view of a fixed type. The top view which shows a movable side layered body. The top view which shows a fixed side layered body. Sectional drawing which shows the modification of the metal mold | die of FIG. 2, the top view of the movable side layered body, and the perspective view of the molded article injection-molded using the metal mold | die of a modification. Explanatory drawing which shows the modification of the cooling piping of Fig.8 (a).

Explanation of symbols

10 Mold (Mold; Injection mold)
11 Fixed type (first division type)
111a to 111n Fixed side layered body (fixed mold side layered body)
12 Movable type (second division type)
112a to 112n Movable side layered body (movable type layered body)
13 Cavity 131 Fixed Side Cavity 131a Cavity Wall 132 Movable Side Cavity 132a Cavity Wall 20 Mold Clamping Device 30 Injection Device 40 Cooling Device (Cold Temperature Control Device)
41 Fixed-side cooling passage (mold temperature control passage; temperature control piping)
41R Fixed side circulation passage 42 Movable side cooling passage (Die temperature adjustment passage; Temperature control piping)
42R Movable side circulation passage 42T Through passage 42Ta Through passage wall 43 Negative pressure pump 50 Projection device 53a Eject pin (projection mechanism)
100 injection molding machine PL mating surface S reference plane

Claims (7)

By moving the movable mold closer to the fixed mold, they are in contact with each other at the mating surface and a cavity is formed between them,
The mold temperature adjusting passage includes a through passage formed through the mating surface and straddling the fixed die and the movable die. At least one of the fixed mold and the movable mold is integrally formed by laminating a plurality of layered bodies having a cross section parallel to the mating surface,
The mold according to claim 1, wherein the layered body includes a cavity wall portion constituting the cavity and a through passage wall portion constituting the through passage. The cavity has a flat plate-shaped base portion, a handle portion projecting upright from the base portion, a zenith portion formed at the tip of the handle portion, and a bifurcated branch at the zenith portion. A triangular wall portion surrounded by a portion including the base portion, the handle portion, and the umbrella-shaped portion of the cavity having such a shape, The molding die according to claim 2, wherein the through passage is penetrated . A mold for injection molding in which a movable mold is moved closer to a fixed mold so that they are clamped at a mating surface and a cavity is formed between them.
A cooling passage as a mold temperature adjusting passage includes a through passage formed through the mating surface and straddling the fixed mold and the movable mold,
A molding die for injection molding, wherein the refrigerant flowing through the through passage is sucked and discharged from a cooling passage on at least one side of the fixed die and the movable die.   The refrigerant flowing through the cooling passage is cooling water, and the cooling water is sucked from the cooling passage on one side of the fixed type and the movable type by a negative pressure pump together with outside air sucked into the through passage from the mating surface. The mold for injection molding according to claim 4, which is discharged. A cavity wall portion that is intended to form a cavity formed between each of a plurality of layered bodies having a cross section parallel to a reference plane including a mating surface of a fixed mold and a movable mold, and the mating surface And a through-passage wall part that is planned to form a through-passage that penetrates the
A method for manufacturing a molding die, wherein the plurality of layered bodies are laminated and integrated, and at least one of the fixed die and the movable die is formed. The layered body on the fixed mold side and the layered body on the movable mold side have the same thickness at an equal distance from the reference plane, and the cavity wall portion and the through-passage wall portion are simultaneously integrated. Formed,
The plurality of layered bodies are respectively laminated and integrated, and the fixed mold and the movable mold are formed in the form of simultaneous progress, so that the fixed mold and the movable mold have symmetric cavities with respect to the reference plane. The manufacturing method of the shaping | molding die of Claim 6 formed respectively.

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