JP2006044119A - Injection molding machine and injection molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a high precision resin-made optical lens or the like free from a residual stress, high in accuracy of the height and concentricity of a product, which can be made by a multi-cavity molding process. <P>SOLUTION: A punch member 7 is inserted into a cavity 6 of an injection-molding machine to make an article 5 by a tip portion 7b of the punch member, an article-molding shape portion 11a of an ejecting/molding pin 11 sliding within the punch member and an article-molding shaping portion 2a in the mold. Simultaneously or before or after, the punch member is inserted to mate a mating edge portion 2g of the outer circumferential portion 2b of the article-molding shaping portion on the mold with the tip end portion 7g of the punch member and to separate the article from dregs 6a. The ejecting/molding pin and the punch member can be independently driven, and the punch member is connected to a rod 9a of a servo-actuator 9 for feedback control. Further the ejecting/molding pin is displaced in the same manner to compression-mold an injected and filled material within the punch member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plastic injection molding machine and an injection molding method, and in particular, during injection molding, in an ideal state in a mold, optical parts such as optical lenses, prisms, reflectors, and precision mechanical parts such as small precision gears. The present invention relates to an injection molding machine and an injection molding method.

  Conventionally, optical parts such as optical lenses, prisms, and reflectors, or precision machine parts such as small gears have been mass-produced by injection molding that is easy to mass-produce. However, conventional injection molding machines cannot provide high molding accuracy, and the quality of products obtained by injection molding is limited to intermediate or low quality. For this reason, various proposals for obtaining a highly accurate molded product in an injection molding machine have been made. For example, in Patent Document 1, a fixed mold or a movable mold is provided with a plate-shaped cavity and a gate portion for injecting resin into the plate-shaped cavity, and the movable mold can be plunged into the plate-shaped cavity and vibrated in the plunging direction. A first punch is provided. Further, the fixed mold is provided with a second punch that can be driven / synchronized with the first punch against the first punch across the plate-shaped cavity. At least one entry surface of the punch is provided with a molded portion of the product portion to be transferred to the surface of the molded product, and the product portion is compressed, pressed, punched, etc. while vibrating the punch during the injection molding process. I am doing so. That is, the plate-shaped cavity is sandwiched between a pair of punches having a molding shape portion on the punch surface, and the plate-shaped cavity sandwiched between the punches is compressed and pressed while vibrating one punch, and formed into a product shape, After molding, the optical parts are punched out from the plate cavity by synchronizing both punches. This makes it easy to handle and handle gates, is easy to pick a large number, suitable for mass production, has high mold transfer accuracy, and is free from the effects of internal distortion and residual stress in the vicinity of the gate. It is disclosed that small precision mechanical parts and the like can be obtained.

On the other hand, in Patent Document 2, a sleeve-shaped punch member is provided in a movable mold, a discharge / molding pin that is slidable in the sleeve-shaped punch member is provided, and the fixed mold corresponds to the punch member. A fitting convex part or fitting concave part that can form a punch member and a fitting part is provided at the position, and after punching into the cavity and drilling, the punch and fitting part are brought into contact with each other. The residue is separated from the hole by the fitting portion, and the residue is discharged by the discharge pin. As a result, when performing hole processing of an injection molded product during the injection molding process, the hole is processed by one punch member for one hole, and there is no resin residue such as a skin layer in the hole of the molded product. An injection molding machine is disclosed that is easy to discharge, does not require a post-process, and can also process a horizontal hole.
Japanese Patent Application Laid-Open No. 7-100878 Japanese Patent Application Laid-Open No. 7-100879

  However, in Patent Document 1, since the plate-like cavity is sandwiched between two punches and both punches are controlled separately, it is difficult to maintain the accuracy of the distance between both punches with high accuracy. There was a problem that the height of the fluctuated. In addition, since both the upper and lower punches can move in the mold, there is a limit to the concentric accuracy, and there has been a problem that the product is misaligned. On the other hand, Patent Document 2 relates to drilling, and what is discharged at the same time as drilling is not a product but a residue, and no suggestion or disclosure is disclosed regarding its use.

  In view of such problems, the problem of the present invention is that gate processing and handling are simple as in the prior art, and it is easy to pick a large number of pieces, suitable for mass production, high mold transfer accuracy, internal distortion and residual in the vicinity of the gate. Provided are an injection molding machine and an injection molding method capable of obtaining a high-precision plastic optical lens, small precision mechanical parts, and the like that are not affected by stress and that have high dimensional accuracy and high concentric accuracy. That is.

  In the patent document 2, the present inventors have found the possibility as a product when paying attention to the waste discharged in drilling. That is, in Patent Document 2, the fitting portion with the punch is determined by the hole diameter and the punch diameter and shape, but if the discharge pin side is shaped and the fitting portion is formed around the discharge pin side, I learned that it can be taken out of the cavity as a product, not as a residue. As described above, it has been found that the product and the residue have a front-back relationship, and the residue can be made into the product shape.

  With this knowledge, in the present invention, in an injection molding machine having a fixed mold and a movable mold, a sleeve-shaped punch member provided in the movable mold or the fixed mold and capable of entering into the cavity; A discharge-molding molding pin that is slidably provided in the punch member, is fixed to the mold side on which the punch member is mounted, and has a product molding shape portion at the tip thereof, and a part of the cavity is sandwiched therebetween A mold-side product molding shape portion provided in a mold on the side facing the product molding shape portion, and an outer peripheral portion of the mold-side product molding shape portion facing the punch member. The above-described problems have been solved by providing an injection molding machine provided with a fitting edge provided so as to be fitted to the inner or outer tip edge of the punch member.

  That is, according to the present injection molding machine, the mold-side product molding shape portion is provided directly or indirectly fixed to the mold, and only the discharge and molding pin side is slidably held by the punch member. Concentric accuracy is improved. Further, the accuracy in the height direction is determined only by the distance between the discharge-use molding pin and the mold-side product molding shape portion. The discharge-use molding pin and the mold-side product molding shape part can be easily mechanically positioned relative to each other, and can be positioned with high accuracy. Further, by inserting a sleeve-like punch member into the cavity, the injected filling member (plastic) is molded or molded with the punch member, the discharge-use molding pin, and the mold-side product molding shape portion. Furthermore, the product and the outside of the punch member can be separated as a residue by fitting between the punch member and the fitting edge, that is, shearing at the fitting portion.

  As described in Patent Document 2 described above, the discharge / combination forming pin is fixed at one end to the ejector plate and penetrates the rod and the punch member such as an actuator for driving the movable member and the punch member provided on the working die. If it provides in this way, after the product and the cavity part outside the punch member are separated, the product attached to the punch member side by the discharge action of the discharge / molding pin is automatically discharged by opening the mold. On the other hand, in the invention according to claim 2, the discharging and forming pin can be driven independently of the punch member. Accordingly, the distance between the discharge-use molding pin and the mold-side product molding shape portion can be appropriately controlled. Therefore, not only molding by simple injection molding but compression molding or the like can be performed between the mold-side product molding shape portion and the discharge / molding pin. Further, when the punch member enters, the discharge molding pin can be retracted to smoothly enter the punch member, or the product can be discharged after the mold is opened.

  In compression molding or the like, control of the compression speed, position, etc. is important, and high-precision molding can be performed by applying vibration. Therefore, in the invention described in claim 3, the discharge / molding pin is connected to a rod of a servo actuator to be feedback controlled. Needless to say, the punch member may be connected to a rod such as a servo actuator for feedback control so that vibration can be appropriately applied and speed and position can be controlled as in the conventional case.

  In order to obtain a product by such an injection molding machine, in the invention according to claim 4, in the injection molding machine according to claim 1, during or after injection filling, or after completion of the gate seal after injection filling, it is maintained. During the pressure process and / or during cooling after completion of holding pressure, the punch member is forcibly displaced to enter the cavity, and at least after the gate seal after injection filling is completed, the tip of the punch member is moved. Injection molding which is fitted with the fitting edge, and the injection filling member is divided into the punch member inside and outside at the fitting edge, and the injection filling member inside the punch member is taken out as a molded part. It was a method.

  That is, at least until the gate seal after injection filling is completed, the injection filling member is smoothly flowed into the space that becomes the product formed by the punch member, the discharge-and-molding molding pin, and the mold side product molding shape portion. Preferably, it is preferable to fill the space in which the product is formed with resin or the like without piercing the punch member until the injection filling is almost completed. Further, after the gate seal is completed, the punch member and the tip edge portion of the punch member are fitted to the fitting edge portion, and the filling member inside the punch member is used as a product, and the outside of the punch member is separated as a residue.

  Furthermore, in the invention described in claim 5, in the in-mold vibration processing device according to claim 2 or 3, during the injection filling, after the gate seal after the injection filling is completed, or during the pressure holding process. Or / and during cooling after completion of pressure holding, the punch member is forcibly displaced to enter the cavity, and at least after the gate seal after injection filling is completed, the front end of the punch member is moved to the fitting edge. An injection molding method in which the injection filling member is divided into an inside and an outside of the punch member at the fitting edge, and the injection filling member inside the punch member is taken out as a molded part. After the gate seal after injection filling of the discharge / combination forming pin is completed, or during the pressure-holding process, during cooling after completion of the pressure-holding, or after cutting, the discharge-and-use molding pin is displaced to displace the punch portion. To provide an injection molding method for compression molding the inside of the injection filling member.

  That is, the injection filling member inside the punch member can be compression-molded by displacing the discharge / molding pin after at least the gate seal after the injection filling is completed or after the division. Furthermore, in the invention described in claim 6, when the discharge / molding pin is displaced, a minute vibration is applied to the discharge / molding pin, and the vibration filling energy softens the injection filling member inside the punch member or controls solidification. And since it is made to soften sufficiently, compression is performed smoothly.

  Further, in the invention according to claim 7, when the punch member is displaced, the punch member is subjected to minute vibration, and the vibration member energy softens the vicinity of the punch member of the injection filling member filled in the cavity, Alternatively, solidification was controlled to sufficiently soften. Thereby, the displacement of the punch member is smooth, and the resin is homogenized and stabilized.

  In the present invention, the product is formed by the punch member (inner side), the mold side product molding shape part, and the discharge-use molding pin, and it can be positioned with high concentricity and high accuracy. Since the outside of the punch member can be separated as a residue, it is possible to obtain a high-precision plastic optical lens, small precision mechanical parts, etc. that are not affected by internal distortion or residual stress in the vicinity of the gate. In addition, as in Patent Document 1, it is not necessary to provide a complicated gate or runner, the runner portion may be used as it is, and there is no problem with the runner arrangement, so that gate design and resin flow design are facilitated. In addition, particularly in the present invention, the design on the fixed mold side is facilitated, and the mold design and processing are simplified. In addition, high-density product placement is possible, and multiple sets can be arranged as a set of punch members, ejection-molding pins, mold-side product molding shape parts, and fitting edges, so a large amount in one injection process This makes it easy to pick up a large number of products and is suitable for mass production.

  In the second aspect of the present invention, the discharge / molding pin can be driven independently, can be compression-molded, etc., and can be controlled in various ways, so that it is possible to obtain a uniform molded product with good transfer accuracy. In addition, the molding conditions can be easily controlled, and can be applied to lenses that require high accuracy and homogeneity. Furthermore, in the invention described in claim 3, since the discharge / molding pin is feedback-controlled to control the vibration, position and speed, it is possible to provide a molded product such as a higher quality lens.

  In the invention according to claim 4, until the gate seal is completed, the injection filling member is smoothly flown into the product space, and after the gate seal is completed, the filling member inside the punch member is used as the product, and the punch member Since the outside is separated as a residue, there is no flow trace (weld line). Furthermore, in the invention according to claim 5, the discharge-molding pin is displaced and the product is compression-molded.In addition, in the invention according to claim 6, micro-vibration is given to the discharge-molding pin and softened. Since the compression is performed smoothly, the shape can be transferred, and a molded product with extremely high uniformity and no internal distortion can be obtained. Further, a high-quality lens is provided. In the invention of claim 7, the punch member is subjected to minute vibration, the resin is softened, the displacement is made smooth, the resin is homogenized and stabilized, and there is no adverse effect on the product. became.

  If the cavity is a plate-like cavity as in the above-mentioned Patent Document 1, the flow of the filling member such as the resin including the discharge-purpose molding pin and the mold-side product molding shape portion is smooth and uniform. New products can be obtained, and the mold design is easier and easier to manufacture than that of Patent Document 1. Moreover, if the punch member, the discharge combined molding pin, the mold-side product molding shape portion, and the fitting edge portion are provided at positions separated from the gate portion for injecting resin into the cavity, the residual strain of the gate portion, etc. In addition, the product part can be separated from the gate part, so that processing such as gate cutting does not affect the product part, so it can be easily performed with high accuracy and high quality. Provide plastic products.

  In addition, after forcibly displacing the punch member and before dividing, the punch member is brought into contact with the molding surface of the injection filling member inside the punch member while giving minute vibrations to the punch member for at least a short time. Needless to say, surface roughness and accuracy can be improved. Further, since the product portion can be separated in the mold during the injection molding, a process such as gate separation is not required again. In addition, it can be easily taken out and inspected in the post-process, can be handled easily, and can be manufactured on the same line as normal injection molding. Needless to say, the product can be molded, separated, and cut during the same injection time as before, the molding cycle is short, and high injection pressure and high-precision mold temperature adjustment are not required.

  Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a main part of a mold of an injection molding machine in the case of a single piece showing the first embodiment of the present invention. 2 is a partial cross-sectional view in the vicinity of the product forming portion during or after injection filling, and FIG. 3 is a partial cross-sectional view in the vicinity of the product forming portion at the time of product division. The product is a convex lens with a disc-shaped ridge at the center and convex hemispheres on both sides. 1 and 2, the mold includes a fixed mold 2 and a movable mold 1, and a runner portion 3, a gate portion 18, and a plate-like cavity 6 are formed on the contact surfaces of both the molds 2 and 1. A sleeve-like punch member 7 that can be inserted into the cavity is slidably incorporated in the movable mold 1. Reference numeral 8 denotes a sprue, and the runner portion 3 connects the plate-like cavity 6 and the sprue 8. The gate portion 18 indicates a resin inlet portion of the plate-like cavity 6 and may be a simple extension portion of the runner portion 3.

  The punch member 7 can be controlled by a hydraulic servo cylinder 9 so that minute vibration or gentle reciprocation can be selected by program control. A fast response proportional valve or a piezoelectric actuator may be used in place of the servo valve 12 that gives minute vibrations or gentle reciprocation. The cylinder 9 may be provided outside the movable mold 1. A discharge pin 10 and a sprue discharge pin 16 for discharging the resin molded in the cavity 6 are fixed at one end to the ejector plate 15 and penetrate the movable mold 1.

  Particularly in the first embodiment, the discharge / molding pin 11 is slidably provided in the punch member 7a. A product molding shape portion 11 a is provided at the tip of the discharge / molding pin 11, opens to the cavity 6, and the opposite side passes through the rod 9 a of the hydraulic servo cylinder 9 and is fixed to the ejector plate 15. A mold side product molding shape portion 2a is provided on the fixed mold 2 so as to face the product molding shape portion 11a with a part of the cavity 6 interposed therebetween. As shown in FIG. 3, the outer peripheral portion 2b of the mold side product molding shape portion 2a has a fitting edge portion 2g adapted to be fitted to the outer edge portion 7g of the outer edge portion 7b of the punch member 7. Is provided. With the outer peripheral edge portion 7g of the punch member fitted to the fitting edge portion 2g, the tip end surface 7c of the punch member, the product molding shape portion 11a of the discharge / molding pin, the mold side product molding shape portion 2a, and the outer peripheral portion 2b And a product portion 5 is formed.

  Next, the operation of the first embodiment will be described. In FIG. 1, the inflowing molten resin 14 passes from the injection molding machine cylinder (not shown) through the sprue 8, the runner part 3, and the gate part 18. Are introduced into the plate-like cavity 6 including the product-molded shape portion 11 a, the mold-side product-molded shape portion 2 a, and the outer peripheral portion 2. At the time of injection and pressure holding, the sleeve-like punch member 7 is held by a hydraulic servo cylinder 9 at a position as shown in FIGS. The inflowing molten resin 14 vibrates left and right as seen in FIGS. 1 and 2 while the plate-like cavity 6 is injected and filled, after injection and filling, during the pressure holding process, or during cooling after the pressure holding is completed. However, if it is forcibly moved to the right, the resin at the interface between the punch member 7 and the product portion 5 is prevented from being softened or solidified by vibration energy, and the punch member can be easily moved. The exothermic softening temperature is said to be 130-140 ° C, and since the temperature difference between the plate-like cavity 6 and the product part 5 during the injection process is small, it is easy to flow, and the local shrinkage during mold cooling is also small. The molded product of the plate is very homogeneous.

  The punch member 7 is further inserted, and the tip 7b of the punch member is fitted into the fitting edge 2g on the fixed mold side as shown in FIG. As a result, a product is formed by the tip end surface 7c of the punch member, the product molding shape portion 11a of the discharge / molding pin 11, the mold side product molding shape portion 2a, and the outer peripheral portion 2b, and is further sheared by the fitting portion. It is divided into a part 5 and a residue part 6 a outside the punch member 7. After the product is solidified, the mold is opened, the product 5 attached to the fixed mold 2 side is discharged by a discharge pin (not shown), and the residue 6a and the sprue 8 attached to the movable mold 1 side are pushed out by the discharge pin 10 and the sprue discharge pin 16 Separate from the movable mold. Since the product 5 can fix the concentric and height dimensions of the mold side product molding shape portion 2a provided on the fixed mold 2 side and the discharge molding pin 11 side product molding shape portion 11a, a highly accurate product is obtained. be able to.

  In addition, when the product 5 adheres to the movable mold 2 side, it is discharged by the discharge / molding pin 11. The punch member 7 is preferably allowed to enter the cavity 6 while being vibrated. However, if the punch member sleeve is thin, the punch member 7 can enter the cavity 6 and fit into the fitting edge 2g without vibration. It is.

  Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a cross-sectional view of a main part of a mold of an injection molding machine in the case of a single piece showing the second embodiment of the present invention. FIG. 5 is a partial cross-sectional view in the vicinity of a product forming portion during or after injection filling, and FIG. 6 is a partial cross-sectional view in the vicinity of the product forming portion at the time of product division. The product to be molded is the same as that in the first embodiment described above. The same parts as those of the first embodiment described above are denoted by the same reference numerals, and a part of the description is omitted. In the first embodiment described above, as shown in FIGS. 1 and 2, the discharge / molding pin 11 protrudes from the surface of the movable mold 1 and the mold side product molding shape portion 2a is fixed including the outer peripheral portion 2b. A part of the surface on the movable mold 1 side of the outer peripheral part forming the lens flange is formed by a punch member tip end face 7c of the punch member 7 which is recessed from the mold surface 2c. In this case, a boundary line between the discharge / molding pin and the punch member is formed on the flange surface 5a. Moreover, the product part 5 does not necessarily adhere to the fixed mold 2 side when the mold is opened. Moreover, since the product part 5 becomes the deepest part of the fixed mold 2, the resin hardly flows.

  Therefore, in the second embodiment, as shown in FIGS. 5 and 6, the punch member 7 is arranged so that the inner side 7 a of the punch member 7 is the outer side 5 b of the punch, and the shape of the lens (product) including the hook is in the vertical direction. Is formed by the product molding shape portion 11a of the discharge / molding pin and the mold side product molding shape portion 2a, and the product is molded by molding the outer side of the ridge with the inner side 7a of the punch member 7. . As shown in FIG. 5, in the original position, the end surface 7 c of the punch member 7 and the product molding shape portion 11 a of the discharge / molding pin 11 are substantially surface positions. The mold-side product molding shape portion 2a protrudes from the fixed mold surface 2c, and an outer peripheral surface portion 2d is formed on the outer side of the outer peripheral portion 2b so that the outer peripheral surface portion and the inner side 7a of the punch member can be fitted. .

  Similar to the first embodiment, in the second embodiment, the molten resin 14 is caused to flow at the position shown in FIGS. Next, the punch member 7 is forcibly moved to the right while applying left and right vibrations when viewed in FIGS. 4 and 5, so that the inside 7 a of the punch member, the product forming shape portion 11 a of the discharge and forming pin, and the mold side product forming The product part 5 is molded with the shape part 2a. Furthermore, as shown in FIG. 6, by fitting the tip edge portion 7g at the tip of the inner side 7a of the punch member to the fitting edge portion 2g at the outer end of the outer peripheral portion 2b of the mold side product molding shape portion 2a. The product 5 is separated. Further, the first punch 7 is vibrated minutely by the hydraulic servo cylinder 9 and is rubbed in a state where the inner side 7a of the punch member is brought into contact with the surface (side surface of the product portion) of the cut outer surface 5b for a short time. Thus, the surface of the outer side 5b of the ridge can be further cleaned. The vibration of the punch member 7 may give a gentle reciprocating motion for a short time.

  Thus, in the second embodiment, there is no streak such as a boundary line, and the product portion 5 protrudes from the fixed mold surface 2c, so that a resin flow is good and a uniform surface can be easily obtained. Further, when the mold is opened, the product adheres to the discharge / molding pin 11 having a large contact surface and the inner side 7a of the punch member, so that the product can be reliably discharged from the mold by the discharge / molding pin 11.

  7 and 8 show the third embodiment. In contrast to the second embodiment, a recess 2e is formed around the outer peripheral surface portion 2c on the outer side of the outer peripheral portion 2b. It is. As a result, the same quality as that of the second embodiment can be ensured, and further, there is an advantage that the amount of the residue portion (portion excluding the product portion) of the plate-like cavity can be reduced.

  Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a cross-sectional view of a main part of a mold of an injection molding machine in the case of a single piece showing the fourth embodiment of the present invention. FIG. The product to be molded is the same as in the first to third embodiments described above. The same parts as those described above are denoted by the same reference numerals, and a part of the description is omitted. In the first to third embodiments described above, the discharge / molding molding pin 11 is fixed to the ejector plate 15 and is in a fixed position from the time of resin filling to the time of product molding. On the other hand, in the fourth embodiment, the discharge / molding pin 11 can be moved in the punch member 7. As shown in FIG. 9, the discharge / molding pin 11 is slidably provided in the punch member 7 a that is driven by the servo cylinder 9. As in the second embodiment, a product molding shape portion 11 a is provided at the tip of the discharge / molding pin 11 and opens into the cavity 6. In particular, in the fourth embodiment, the opposite side passes through the rod 9 a of the hydraulic servo cylinder 9 and is further connected to the rod 21 a of the hydraulic cylinder 21. A pressure reducing valve 22 and a switching valve 23 for controlling the pressing pressure are connected to the hydraulic cylinder 21, and can be moved and vibrated left and right as viewed in the figure by a hydraulic source 24. Needless to say, a servo cylinder, a piezoelectric actuator, or the like may be used instead of the hydraulic cylinder 21 or the like. Reference numeral 25 denotes an oil tank.

  In the fourth embodiment, the discharge / molding pin 11 can be given vibration or moved arbitrarily, so that the discharge / molding pin is displaced, the product 5 is compression molded, and further, the discharge / molding pin is subjected to minute vibration. Applying, softening, and smooth compression molding are possible, the shape is transferred, and a molded product with high transfer accuracy that is extremely homogeneous and free from internal distortion can be obtained. The product 5 may be discharged either by operating the hydraulic cylinder 21 or by the ejector 15.

  Next, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a sectional view of an essential part of a mold of an injection molding machine in the case of multi-cavity showing the fifth embodiment of the present invention. FIG. 11 and FIG. 11 are plan views of the residue portion 6a from which the product 5 is removed. The product to be molded is the same as in the first to fourth embodiments described above. The same parts as those described above are denoted by the same reference numerals, and a part of the description is omitted. As shown in FIGS. 10 and 11, in the first to fourth embodiments described above, a single product is obtained, whereas in the fifth embodiment, multiple products are obtained. It is.

  In the present embodiment, 3 × 4 = 12 punch members 7, discharge / molding pins 11, and mold-side product molding shape portions 8 are arranged as a set. The rear ends of the twelve punch members 7 are fixed to the rod 9 a of the servo cylinder 9 via the plate 26. Further, the discharge / molding pin 11 passes through the plate 26 and is fixed to the ejector plate 15 via a discharge plate (not shown). As a result, in the second embodiment, a plurality of products 5 (lenses) can be obtained by one injection molding. Needless to say, as in the fourth embodiment, compression / vibration compression molding may be performed so that the discharge / molding pin 11 can be driven independently.

It is principal part sectional drawing of the metal mold | die of the injection molding machine in the case of the single picking which shows 1st embodiment of this invention. FIG. 3 is a partial cross-sectional view in the vicinity of a product molding portion during or after injection filling showing the first embodiment of the present invention. It is a fragmentary sectional view of the product molding part vicinity at the time of the product parting which shows 1st embodiment of this invention. It is principal part sectional drawing of the metal mold | die of the injection molding machine in the case of the single picking which shows 2nd embodiment of this invention. It is a fragmentary sectional view of the product molding part vicinity during injection filling which shows 2nd embodiment of this invention, or after injection filling. It is a fragmentary sectional view of the product molding part vicinity at the time of the product parting which shows 2nd embodiment of this invention. It is a fragmentary sectional view near the product forming part during injection filling or after injection filling showing a third embodiment of the present invention. It is a fragmentary sectional view of the product molding part vicinity at the time of the product parting which shows 3rd embodiment of this invention. It is principal part sectional drawing of the metal mold | die of the injection molding machine in the case of the single picking which shows 4th embodiment of this invention. It is principal part sectional drawing of the metal mold | die of the injection molding machine in the case of multi-piece picking which shows 5th embodiment of this invention. It is a top view of the dregs part where the product which shows a 5th embodiment of the present invention was removed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Movable metal mold 2 Fixed mold 2a Mold side product molding shape part 2b Outer peripheral part 2g Fitting edge part 5 Molded part (product)
6 Cavity 7 Punch member 7a Inside of punch member 7b Tip end of punch member 7g Tip edge of punch member 9 Servo actuator (servo cylinder)
9a Rod 11 Ejecting and forming pin 11a Product molding shape part 14 Injection filling member (resin)

Claims (7)

In an injection molding machine having a fixed mold and a movable mold, a sleeve-like punch member provided in the movable mold or the fixed mold and capable of entering into the cavity, and slidable in the punch member. A discharge-molding molding pin fixed to the mold side on which the punch member is attached and having a product molding shape portion at the tip, and a side facing the product molding shape portion with a part of the cavity interposed therebetween A mold-side product molding shape portion provided in the mold, and an outer peripheral portion of the mold-side product molding shape portion is provided to face the punch member and is provided at a tip portion of the punch member. An injection molding machine comprising a fitting edge adapted to be fitted to an inner or outer tip edge. 2. The injection molding machine according to claim 1, wherein the discharge / combination forming pin can be driven independently of the punch member. The injection molding machine according to claim 2, wherein the discharge / combination molding pin is connected to a rod of a servo actuator and feedback-controlled. 2. The injection molding machine according to claim 1, wherein the punch member is forced during injection filling, after completion of gate sealing after injection filling, during a pressure holding process, and / or during cooling after completion of pressure holding. And at least after the gate seal after injection filling is completed, the front edge of the punch member is fitted with the fitting edge, and the injection filling member is formed at the fitting edge. Is divided into the punch member inner side and the outer side, and the injection filling member inside the punch member is taken out as a molded part. 4. The injection molding machine according to claim 2 or 3, wherein the punch member is formed during injection filling, after completion of gate sealing after injection filling, during a pressure holding process, and / or during cooling after completion of pressure holding. Is forced to displace and enter into the cavity, and at least after the gate seal after injection filling is completed, the tip of the punch member is fitted to the fitting edge, and the injection filling is performed at the fitting edge. An injection molding method in which a member is divided into an inner side and an outer side of the punch member, and the injection filling member inside the punch member is taken out as a molded part, and the gate seal after the injection and filling molding pin is injected and filled is completed. The injection filling member inside the punch member is compression-molded by displacing the discharge / molding pin after the holding pressure, during the pressure-holding process, during cooling after the pressure-holding is completed, or after dividing. Injection molding method. 6. A micro vibration is applied to the discharging and forming pin when the discharging and forming pin is displaced, and the injection filling member inside the punch member is softened by the vibration energy, or solidification is controlled and sufficiently softened. The injection molding method described in 1. When the punch member is displaced, a minute vibration is applied to the punch member, and the vicinity of the punch member of the injection filling member filled in the cavity is softened by the vibration energy, or solidification is controlled and sufficiently softened. The injection molding method according to claim 4, 5 or 6.

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