Molding mold, ejector mechanism and flow pressure regulator used therein

Abstract

To facilitate a manufacture of molds and ejector pins, to improve an efficiency of mold disassembly and assembly, to increase a durability of the molds, to maintain and equalize a flow pressure of a molten material in a channel, and to improve a quality of a molded product by eliminating air, gas, etc.SOLUTION: In a molding mold 1, a time lag ejector pin TEP is composed of a driven pin part TE1 and a driving pin part TE2, the driven pin part TE1 includes: a standby biasing means SB; standby position regulating means WR; a split base end arranged at any position of an ejector hole EH or an ejector plate 50 when it is in a standby position, when the time lag ejector pin TEP is in the standby position, the driving pin part TE2 is provided on the ejector plate 50, and when each ejector pin 51 is in a standby position, an ejector mechanism 5 is provided in which a divided tip is disposed at a timing adjustment position TAP where a timing adjustment gap TAG is separated or where the divided tip is directly abutted without a gap.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a molding die technology for filling a molten material to mold a product, and more particularly to a zector mechanism and a flow pressure regulator used in a molding die. [Background technology]

[0002] (Conventional ejector pin) Conventionally, in a mold for resin injection molding, as the dimensions of the molded product become larger, the mold cavity becomes deeper and the injection pressure of the molten resin material is set higher. To satisfy these conditions, multiple thicker mold plates are used, which increases the size of the entire mold and, accordingly, the ejector pins also become thicker and longer.

[0003] The longer the ejector pin, the more important it is to prevent bending during the manufacturing process, and high machining precision is required to finish it into a straight shape, which increases the manufacturing cost. The lengths of the ejector pins installed in accordance with the differences in the depth of each part of the cavity also differed from one another. In particular, long ejector pins were difficult to handle and required more careful handling when disassembling and assembling the mold, which reduced work efficiency.

[0004] If the ejector pin is long, high machining accuracy is required for the inner diameter of the ejector hole passing through the die and the center accuracy in the longitudinal direction, etc., which results in a rise in the manufacturing costs of the die and the ejector pin.

[0005] As shown in Fig. 4(a), when a molten resin material MM is filled into a mold, cooled and solidified, the mold is opened and a rectangular plate-shaped resin molded product MM is pushed out of a cavity (not shown) by a plurality of ejector pins 51, as shown in Fig. 4(b), warping occurs in the molded product MM, and if the warping is too large, it becomes a defective product and cannot be shipped as a product. In addition, residual strain remains in the molded product, and the residual strain can later cause problems such as deformation and cracks in the molded product.

[0006] Similarly, as shown in Figure 5(a), when a resin molded product MM having a short cylindrical sleeve protruding from the center of the upper surface of a rectangular plate is pushed out from a cavity (not shown) by multiple ejector pins 51, warping occurs in the molded product MM as shown in Figure 5(b). If the warping is too large, the product will be determined to be defective and will not be able to be shipped.

[0007] One technique for solving this problem is to delay the timing of the ejector pin's protrusion relative to the protrusion of other ejector pins. For example, in Patent Document 1 (Japanese Utility Model Application Publication No. 6-64824), when a molded product that is in close contact with a core mold is pushed up and peeled off from the core mold by the first to third ejector pins, one side of the outer periphery of the molded product is pushed up and peeled off by the second and third ejector pins before the other side, and air is supplied to the peeled off part by an overhead block and air supply piping.

[0008] The air supplied to the peeled part on one side of the outer periphery of the molded product reaches the other side of the inner and outer periphery of the joint surface against the sealing force acting on the joint surface between the molded product and the core mold, so that the molded product and the core mold are completely peeled off. Therefore, the molded product can be easily peeled off from the core mold. Furthermore, after the complete peeling, the first ejector pin that abuts against the bottom of the recess or the balance adjustment screw rises due to the rise of the ejector plate, and rises with a delay from the second and third ejector pins, so that the entire molded product is pushed up above the core mold by all the ejector pins, and therefore a molded product release device is disclosed that can minimize the deflection of the molded product and prevent deformation, damage, etc. due to the deflection.

[0009] In addition, in Patent Document 2 (Japanese Utility Model Application Laid-Open Publication No. 4-128820), when the movable die retreats and separates from the fixed die, the movable core slidably assembled in the movable die retreats by the inclined pin fixed to the fixed die. After that, the ejector plate moves upward, and the leading ejector pin fixed to the ejector plate pushes out the molded product. At this time, there is a certain distance before the delay ejector pin reaches the molded product, and normally (until now), the gate is pushed out first by the delay ejector pin, and the molded product is deformed and pushed out, but in the invention of Patent Document 2, there is a certain distance between the timing bar and the lower plate, so the delay ejector pin comes into contact with the lower plate and starts moving after the ejector plate advances the certain distance. Therefore, when the molded product and the gate are pushed out, the leading ejector pin and the delay ejector pin come into contact with each other at the same time and are pushed out. This results in a mold structure that does not leave marks from the ejector pins on the molded product, and an injection molding mold is disclosed that allows the molded product to be removed without being deformed.

[0010] (Poor filling of molten resin) Conventionally, when producing a molded product using a multi-cavity mold for resin injection molding, molten resin is injected from the nozzle of the injection device through the sprue, runner, and gate inside the mold into each cavity, and then cooled and solidified inside the mold to produce the molded product. The quality of molded products removed from the mold are not all the same; each product has a different appearance, size, weight, etc., and mass production leads to quality variations and the occurrence of defective products. For this reason, many molded products are subject to full inspection.

[0011] The causes of variation in the quality of molded products are air spaces in the molten resin material in the flow paths connecting each cavity, and the effects of gas generated by the molten resin material. As shown in Figures 9 and 10(a) and (b), in particular in the case of multiple-cavity molding, the molten resin material MM is not uniformly filled into each cavity CV. Depending on the shape of the flow path from the injection device (not shown) of the molten resin material MM to the sprue FP1, runner FP2, and gate FP3, and the air or gas in the flow path, the molten resin material MM is divided into cavities CV where it flows easily and cavities CV where it flows more or less difficult, as shown by the arrows F1, F2, and F3 in Figures 9 and 10(a) and (b). This phenomenon is considered to be caused by the so-called hesitation phenomenon in which the flow (filling) into the cavities is temporarily or instantaneously halted (stopped) due to reasons such as the temperature control of the mold, the mold design reasons such as the shape and size of the runner and the shape and size of the gate, and the flow characteristics of the molten material.

[0012] Techniques for solving the problem of insufficient filling of the molten resin material into the cavity have been developed in the past. For example, Patent Document 3 (Registered Utility Model No. 3226416) discloses a lens molding die, a gas pressure control device, and a high-pressure gas generator, in which the lens molding die comprises a first die plate and a second die plate, a lens mold cavity is formed between the first die plate and the second die plate, a runner is provided in the second die plate which communicates with the lens mold cavity, a sprue is provided in the first die plate for communication with the runner, a gas passage is provided in the second die plate which communicates with the lens mold cavity, and the output side of the high-pressure gas generator communicates with the gas passage via the gas pressure control device.

[0013] The invention of Patent Document 3 discloses a lens molding system that applies pressure in a reverse direction to the front edge of the melt flow by controlling the change in gas pressure inside the lens mold cavity, thereby increasing the pressure at the front edge of the melt flow during the molding process, suppressing the gushing of the melt on both the upper and lower sides, and changing the flow direction of the melt, thereby changing the welding angle of the bonding line and eliminating the bonding line. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] Japanese Utility Model Application Publication No. 6-64824 [Patent Document 2] Japanese Utility Model Application Publication No. 4-128820 [Patent Document 3] Registered Utility Model No. 3226416 Summary of the Invention [Problem to be solved by the invention]

[0015] (Ejector pin) However, the conventional ejector pin shown in Patent Document 1 (Japanese Utility Model Application Laid-Open Publication No. 6-64824), which protrudes with a delay following the movement of the ejector plate, is a single rod-shaped pin extending from the ejector plate to the cavity, and this ejector pin requires high-precision machining, resulting in high manufacturing costs and requiring more man-hours to disassemble and assemble the mold, which are drawbacks.

[0016] The delay ejector pin shown in Patent Document 2 (Japanese Utility Model Application Laid-Open Publication No. 4-128820) is divided into two parts, an upper part and a lower part, but this two-part structure is fitted within the thickness of the ejector plate, and the area from the ejector plate to the cavity is a single rod-shaped member, so the manufacture of the ejector pin also requires high-precision machining.

[0017] In view of the above circumstances, the present invention aims to provide a molding die and an ejector mechanism for use therewith, which shortens the ejector pins even in large dies, makes the processing of the ejector pins easier, improves the work efficiency of the die disassembly and assembly processes, and increases the durability of the die.

[0018] (Poor filling of molten resin) Furthermore, the lens molding system shown in Patent Document 3 (Registered Utility Model No. 3226416) requires the provision of a gas passageway in the mold that communicates with the cavity, and is structured so that the output side of a high-pressure gas generator that generates high-pressure inert gas is connected to the mold via a gas pressure control device, and the gas pressure control device is equipped with a barometer that measures the internal pressure of the cavity and performs feedback control based on the measured pressure.

[0019] This resulted in a complex mold structure, which in turn increased manufacturing costs, and also left the problem of new expenses being required for the manufacture, upkeep and maintenance of the mold, such as the supply of inert gas and feedback control.

[0020] In addition, in a conventional mold, as shown by the two-dot chain lines (time-flow pressure) in Figures 6 and 9, the molten resin material MM as the melt agent MM flowed from the sprue FP1 into the runner FP2 at an injection pressure of 30 MPa undergoes pressure loss due to friction with the inner wall of the flow path and bending and branching of the flow path, causing the flow pressure to drop to 10 MPa or less, and the molten resin material MM flows directly into the cavity CV from the gate FP3, filling the cavity CV, where the flow pressure rises to its maximum value. After that, the molten resin material MM solidifies after a pressure holding period for the gate sealing time and a cooling period, and the pressure in the flow path FP of the sprue FP1, runner FP2, and gate FP3, and in the cavity CV, drop, resulting in molding through this pressure change. However, when the molten resin material MM injected at 30 MPa flows from the gate FP3 into the cavity CV, the pressure is reduced to 10 MPa or less, and it may not be possible to obtain a sufficient inflow speed at the initial stage of flowing into the cavity CV.

[0021] As shown in Figures 10(a) and 10(b), for example, when a plurality of cavities CV are filled through a runner FP2 branched into a plurality of branches from a single sprue FP1 and a gate FP3 further branched therefrom, as shown by F1, F2, and F3 in Figure 10(a), the flow pressure of the molten resin material MM flowing into the cavity CV decreases as the distance from the sprue FP1 increases, and the filling conditions deteriorate, resulting in the production of a defective molded product MM as shown in Figure 10(b). In addition, the causes of such molding defects are considered to be, for example, the type of resin to be filled, the specifications of the mold, the specifications of the molding machine, etc., as well as molding conditions set for each material to obtain various molded products such as metals and foods, and the flow of the molten material (filler) such as resin in the flow passages in the mold, the pressure conditions, etc.

[0022] In view of the above circumstances, the present invention aims to provide a molding die and a flow pressure regulator for use therewith which maintain and equalize the flow pressure of the molten material in the flow passages of the sprue, runner or gate, remove air, gas, etc., and eliminate hesitation phenomena, thereby making the quality of the molded products in each cavity more uniform and improving the defective rate. [Means for solving the problem]

[0023] The present invention relates to a molding die having at least a movable die, a fixed die and an ejector box, a cavity being formed between parting surfaces, a flow path being provided leading to the cavity from the outside, and a plurality of ejector holes in the movable die, the mold having a plurality of ejector pins inserted into each of the ejector holes so as to be able to freely appear and disappear, and an ejector plate in the ejector box, each ejector pin being either a standard ejector pin or a time lag ejector pin, the time lag ejector pin comprising a driven pin portion and a drive pin portion, the driven pin portion having a protruding end which coincides with a wall of the cavity of the movable die when the time lag ejector pin is in a standby position, and a drive pin portion which is synchronous with the ejector hole of the movable die. The present invention relates to a molding die provided with an ejector mechanism having a standby biasing means which biases the driven pin portion in a standby direction with a force weaker than the driving force of the ejector plate, a standby position regulating means which regulates the driven pin portion to the standby position against the bias of the standby biasing means, and a split base end which is arranged in either the ejector hole when the time lag ejector pin is in the standby position, or in any position on the ejector plate when it is in the standby position, wherein the drive pin portion is provided on the ejector plate, and when each ejector pin is in the standby position, the split tip end is arranged at either of timing adjustment positions TAP where there is a timing adjustment gap between the split base end of the driven pin portion or where there is direct contact without any gap.

[0024] The ejector box secures a space for driving the ejector plate or an ejector driving mechanism instead of the ejector plate. It is not limited to a box type, and may be a skeleton type without walls, or a type surrounded by walls with openings.

[0025] The parting surfaces form a cavity, a gate, a runner, and a part of a sprue between the movable mold and the fixed mold, and a very small gap can be secured to allow air mixed in the molten material flowing into the cavity and the flow path and gas generated by the molten material to be discharged to the outside of the molding die.

[0026] The dimension of the gap between the parting surfaces when the movable and fixed dies are joined and the molten material is injected can be, for example, 0.02 to 0.5 mm, 0.025 to 0.076 mm, 0.051 to 0.152 mm, 0.102 to 0.229 mm, or 0.230 to 0.510 mm. For example, between the parting surfaces facing the flow paths of the gate, runner, and sprue, gas venting gaps leading from a plurality of points of the flow paths to the outside of the molding die can be engraved. The gas venting gaps can be very shallow groove-like, slightly enlarged, for example, by about 0.01 to 0.2 mm, compared to the gap between normal parting surfaces.

[0027] The ejector mechanism drives each ejector pin to move back and forth between a respective projection position and a respective standby position during the injection molding process. For example, the ejector mechanism may be comprised of an ejector hole, an ejector plate, a standard ejector pin, and a time lag ejector pin.

[0028] The ejector pin pushes the molded product in the cavity out of the molding die, and may be, for example, a standard ejector pin or a time-lag ejector pin.

[0029] When the standard ejector pin receives the driving force of an ejector plate or an ejector drive mechanism replacing it, it protrudes, for example, slower than a time lag ejector pin that is protruded first, or faster than a time lag ejector pin that is protruded with a delay, thereby reducing the stress applied by extrusion to outer edges and thin-walled portions of the molded product that are prone to deformation.

[0030] The standard ejector pin may include a driven pin portion disposed in the ejector hole and a drive pin portion provided on the ejector plate.

[0031] When the time lag ejector pin receives the driving force of an ejector plate or an ejector drive mechanism replacing it, it protrudes, for example, before the standard ejector pin or protrudes later than the standard ejector pin, thereby reducing the stress applied by extrusion to the outer edges and thin-walled portions of the molded product that are prone to deformation.

[0032] The driven pin portion of the time lag ejector pin pushes out the molded product in response to the protruding action of the drive pin portion, and is separated from the drive pin portion and is arranged either within the ejector hole of the movable mold when the time lag ejector pin is in the standby position, or on the wall of the ejector plate facing the movable mold when it is in the standby position, thereby preventing thermal deformation due to temperature changes in the movable mold from being transmitted to the drive pin portion.

[0033] The drive pin portion of the time lag ejector pin transmits the drive force of the ejector plate or an ejector drive mechanism replaced therewith to the driven pin portion with a time lag, transmitting the protruding force to the driven pin portion either earlier or later than the standard ejector pin. Also, the drive pin portion is separated from the driven pin portion, avoiding the thermal influence from the driven pin portion and preventing wear, deformation and damage of the time lag ejector pin and ejector hole.

[0034] The standby biasing means biases the driven pin in the standby direction with a force weaker than the driving force of the ejector plate. For example, the driven pin can be biased using any driving force such as a spring, hydraulic pressure, compressed air, magnetic force, a motor, etc. The standby biasing means can be expected to have the same effect by using a mechanical system such as a cam mechanism or a scissor mechanism, or a hydraulic or air cylinder instead of a spring.

[0035] The standby position restricting means restricts the driven pin portion to the standby position against the biasing force of the standby biasing means, thereby preventing the driven pin portion from being excessively retracted.

[0036] The time lag ejector pin may have a timing adjustment gap between the divided base end of the driven pin portion and the divided tip end of the drive pin portion when each ejector pin is in the standby position.

[0037] The timing adjustment gap is provided between the divided base end of the driven pin portion and the divided tip end of the drive pin portion, and the driving force of the drive pin portion is transmitted to the driven pin portion with a time difference of either before or after the protruding action of a standard ejector pin that receives the driving force of an ejector plate or an ejector drive mechanism replaced therewith, causing the driven pin portion to protrude. The narrower the interval of the timing adjustment gap is set, the earlier the driven pin portion protrudes, and the wider the interval is set, the later the protruding action is.

[0038] The timing adjustment position is a position at which the divided tip end of the drive pin portion is disposed across the timing adjustment gap from the divided base end of the driven pin portion when each ejector pin is in the standby position.

[0039] The present invention relates to a molding die having at least a movable die, a fixed die and an ejector box, a cavity being formed between parting surfaces, at least one of a sprue, a runner and a gate being provided so as to reach the cavity from the outside, and having a plurality of ejector holes penetrating from a wall of the cavity of the movable die to the ejector box, and a plurality of ejector pins being inserted into each of the ejector holes so as to be able to freely appear and disappear, and an ejector plate in the ejector box, and each ejector pin is a standard ejector pin or a time-lapse ejector pin. The ejector plate includes a driven plate that faces the wall of the movable mold at a distance corresponding to at least the amount of projection of each standard ejector pin when the standard ejector pin is in the protruding position, and a driving plate that faces the wall of the driven plate on the opposite side to the movable mold at a distance for generating a projection time lag when each standard ejector pin and time lag ejector pin are disposed at the standby position, and the standard ejector pin has a base end connected to the driven plate, and a tip end connected to the wall of the movable mold when the driven plate is in the standby position. The time lag ejector pin is set to a length that coincides with the wall of the cavity, and the time lag ejector pin is composed of a driven pin portion and a drive pin portion, and the driven pin portion has a protruding end that coincides with the wall of the cavity of the movable mold when the time lag ejector pin is in a standby position, a standby biasing means that biases the driven pin portion in a standby direction with respect to the ejector hole of the movable mold with a force weaker than the driving force of the ejector plate, a standby position restricting means that restricts the driven pin portion to the standby position against the biasing force of the standby biasing means, and a drive pin portion that biases the ejector hole of the movable mold with a force weaker than the driving force of the ejector plate when the time lag ejector pin is in a standby position. The ejector mechanism has a split base end located either within an ejector hole, or on a wall facing the inside of the ejector box of the movable mold, or on a wall facing the movable mold or the driven plate when the driven plate is in the standby position, and the drive pin portion is provided on the driven plate of the ejector plate, and when each ejector pin is in the standby position, the split tip end is located at either of the timing adjustment positions where there is a timing adjustment gap between the split base end of the driven pin portion or where there is direct contact with the split tip without any gap.

[0040] When the drive plate starts to protrude, the driven plate of the ejector plate comes into contact with the drive plate after the drive plate has traveled the distance for generating the protrusion time lag, and protrudes with a delay relative to the drive plate.

[0041] The driving plate of the ejector plate starts protruding prior to the driven plate, and comes into contact with the driven plate after traveling a distance for generating the protrusion time lag, causing the driven plate to protrude with a delay relative to the driving plate.

[0042] The time lag ejector pin can be configured such that, when each ejector pin is in the standby position, a timing adjustment gap is provided between the split base end of the driven pin portion and the split tip end of the drive pin portion, or the time lag ejector pin can be directly abutted without any gap.

[0043] The timing adjustment position can be the position of the split tip end of the drive pin portion that is either separated by a timing adjustment gap from the split base end of the driven pin portion or directly abuts without any gap when each ejector pin is in the standby position.

[0044] The distance for generating the protrusion time lag is a separation distance set between the driven plate and the driving plate when the ejector plate is in the standby position, and a time difference is set between the start of protrusion of the driving plate and the start of protrusion of the driven plate depending on the length of the distance. The longer the distance, the larger the time difference is set, and the smaller the distance, the smaller the time difference is set. Furthermore, when the driven pin portion is set to the same dimension, the larger the distance for generating the protrusion time lag, the smaller the protrusion amount of the time lag ejector pin is set, and the smaller the distance, the larger the protrusion amount of the time lag ejector pin is set.

[0045] The present invention has a plurality of ejector pins inserted into a plurality of ejector holes so as to be able to freely appear and disappear, and an ejector plate in the ejector box, each of which is either a standard ejector pin or a time lag ejector pin, and the ejector plate includes a driven plate that faces a wall of the movable mold at a distance corresponding to at least the amount of protrusion of each of the standard ejector pins when the standard ejector pins are in a standby position, and When each of the standard ejector pins and the time lag ejector pins is arranged at a standby position, the driven plate faces the wall of the driven plate opposite the movable mold at a distance for generating a time lag, and the base end of the standard ejector pin is connected to the driven plate, and when the driven plate is at the standby position, the length of the tip is set so that it coincides with the wall of the cavity of the movable mold, and the time lag ejector pin is composed of a driven pin portion and a drive pin portion, and the driven pin portion is a protruding end that coincides with a wall of the cavity of the movable mold when the time lag ejector pin is in a standby position, a standby biasing means that biases the driven pin portion in a standby direction with respect to the ejector hole of the movable mold with a force weaker than the driving force of the ejector plate, a standby position restricting means that restricts the driven pin portion to the standby position against the biasing force of the standby biasing means, and a standby position restricting means that biases the driven pin portion against a wall facing the ejector hole of the movable mold, an ejector box of the movable mold, or a standby position restricting means when the time lag ejector pin is in a standby position. and a split base end arranged at either a wall of the driven plate facing the movable mold or a wall facing the driven plate when the driven plate is in a standby position, the drive pin portion is provided on the driven plate of the ejector plate, and when each ejector pin is in a standby position, the split tip is arranged at either a timing adjustment position where there is a timing adjustment gap between the split base end of the driven pin portion and the split tip, or where there is direct contact with the split tip without any gap.

[0046] The present invention relates to the ejector mechanism, wherein the time lag ejector pin has a drive pin portion provided on a driving plate of the ejector plate, and a split tip end is arranged at a timing adjustment position where it directly abuts, without any gap, against the split base end of the driven pin portion when each ejector pin is in a standby position.

[0047] In the ejector mechanism of the present invention, in which the split base ends of the driven pin portions and the split tip ends of the drive pin portions are in direct contact with each other without any gap when each ejector pin is in a standby position, the time lag ejector pins protrude further than the standard ejector pins when the drive plate of the ejector plate approaches the driven plate.

[0048] The present invention relates to the ejector mechanism in which the time lag ejector pin has the drive pin portion protruding from the drive plate of the ejector plate, and when each ejector pin is in a standby position, the split tip end is arranged at a timing adjustment position which separates from the split base end of the driven pin portion a timing adjustment gap which is either equal to the distance for generating a protruding time lag between the drive plate and driven plate in the standby position, or shorter than the distance for generating the protruding time lag.

[0049] In the ejector mechanism of the present invention, in which the divided tip end of the drive pin portion is arranged at a timing adjustment position which, when each ejector pin is in a standby position, separates from the divided base end of the driven pin portion a timing adjustment gap which is either equal to the distance for generating a protrusion time lag between the drive plate and driven plate in the standby position or shorter than the distance for generating the protrusion time lag, the time lag ejector pin can be made to protrude slightly further than the standard ejector pin when the drive plate of the ejector plate approaches the driven plate.

[0050] The present invention relates to the ejector mechanism, wherein the time lag ejector pin has a drive pin portion that protrudes from a driving plate of the ejector plate, and when each ejector pin is in a standby position, a split tip end is arranged at a timing adjustment position that separates a timing adjustment gap between the split base end of the driven pin portion and the drive plate and the driven plate in the standby position by a distance that exceeds the distance for generating a protruding time lag between the drive plate and the driven plate in the standby position.

[0051] In the ejector mechanism of the present invention, in which the divided tip end of the drive pin portion is arranged at a timing adjustment position between the divided base end of the driven pin portion and the divided base end of the driven pin portion by a timing adjustment gap that exceeds the distance between the drive plate and driven plate in the standby position when each of the ejector pins is in the standby position, the time lag ejector pin can be protruded with a delay after the standard ejector pin when the drive plate of the ejector plate approaches the driven plate.

[0052] The time lag ejector pin relates to the ejector mechanism, in which at least one of the driven pin portion and the driving pin portion is provided with a projection timing adjustment means, which is made of a screw mechanism and can change the timing adjustment gap between them.

[0053] The projection timing adjustment means can adjust and temporarily fix the timing adjustment gap with respect to at least one of the driven pin portion or the driving pin portion, and can adjust the timing adjustment gap. The projection timing adjustment means can have a length adjustment mechanism and a temporary fixing mechanism. The length adjustment mechanism can be, for example, a screw mechanism such as a bolt and nut, or a telescopic mechanism that can expand and contract. The temporary fixing mechanism can be, for example, a double nut or a temporary fixing pin, which can temporarily fix the length adjustment mechanism to an expanded or contracted length.

[0054] The present invention relates to a molding die provided with a flow pressure regulator comprising: valve means which is provided at least at one location of a movable or fixed sprue, runner or gate, crosses the flow path of the molten material beyond the parting surface and is freely movable between a gapped closed position in which a small cross-sectional area of ​​the flow path is secured in the crossing direction and an open position which opens to an area equivalent to the cross-sectional area of ​​the flow path; and elastic biasing means which presses the valve means to the gapped closed position when the pressure inside the flow path of the molten material is below standard flow pressure, and which has an elastic force to bias the valve means to retreat to the open position when the standard flow pressure is reached.

[0055] The valve means is biased by the elastic biasing means to close the flow passage of the sprue, runner, gate, or the like to a state in which a small cross-sectional area of ​​the flow passage remains, blocking the inflow of the molten material, increasing the flow pressure in the flow passage, and opening the flow passage when the flow pressure increases. The valve means provided to cross the flow passage of the molten material beyond the parting surface can be configured to block the molten material that has flowed into the flow passage so that it passes through in small amounts at a time, increase the flow pressure, and discharge air contained in the molten material and gas generated by the molten material to the outside of the molding die through the parting surfaces when closed in the gap-closed position. Furthermore, the valve means can be configured to discharge the air and gas to the outside of the molding die through the parting surfaces at the position where the valve means was disposed when opened beyond the parting surfaces.

[0056] In the above-mentioned gapped closed position, when closed, a small gap is formed between the tip of the valve means and the wall surface of the flow path, most of the molten material flowing into the flow path is blocked by the valve means, increasing the flow pressure, and only a small portion of the molten material passes through the gap with the increased flow pressure. The passing molten material applies the same flow pressure to the tip of the valve means, and when this flow pressure exceeds the biasing force of the elastic biasing means, the valve means is retracted in the opening direction.

[0057] The gapped closed position is the position where the tip of the valve means is located when the valve means is closed, and is a position where the flow path in which the flow pressure regulator is provided is closed to an opening degree of less than 100%, and can be set to an opening degree of several percent to several tens of percent, as shown in the embodiment described below.

[0058] The open position may be a position where the valve means is fully open, where a cross-sectional area corresponding to each flow path of the sprue, runner, gate, etc. is opened, and where the valve means is retracted beyond the parting surface.

[0059] The above-mentioned flow pressure regulator can be replaced by one that has a valve means, a drive source capable of driving the valve means to move back and forth between a closed position where the flow path is 100% closed and an open position where the flow path is 100% open, a flow pressure sensor disposed upstream of the valve means in the flow path, and a control unit connected to the drive source and the flow pressure sensor, and that controls the drive source so that when the detection value of the flow pressure sensor is less than the standard flow pressure, the valve means is disposed in the closed position where it is 100% closed, and when the detection value of the flow pressure sensor reaches the standard flow pressure, the control unit is disposed in the open position where it is 100% open.

[0060] The standard flow pressure may be equivalent to the flow pressure of the molten material flowing from the injection unit into the molding die, for example, when the flow pressure of the molten material flowing from the injection unit into the molding die is 30 MPa, the standard flow pressure may be 30 MPa to 20 MPa, and may be the same as the supply pressure from the injection unit or may be in the range of up to a flow pressure that is about 10 MPa less than the supply pressure. For example, the standard flow pressure may be in the range of up to a flow pressure that is about 5 MPa less than the supply pressure, for example, 30 MPa to 25 MPa, and the smaller the degree of reduction in pressure from the supply pressure, the faster the cavity can be filled, the shorter the molding time, and the higher the quality of the molded product.

[0061] The present invention relates to the molding die provided with a flow pressure regulator comprising: a cylinder portion drilled in at least one of a movable or fixed sprue, runner or gate so as to communicate in a direction intersecting with a flow path of the molten material; a valve piece serving as valve means having a tip shaped to be able to close with a gap so as to secure a gap between the wall surface of the flow path of the molten material and being freely movable between a gapped closed position where a small cross-sectional area of ​​the flow path is secured from within the cylinder portion beyond the parting surface and an open position beyond the parting surface so as to open a cross-sectional area equivalent to the flow path; and elastic biasing means provided between a deep portion of the cylinder portion and a base end of the valve piece, for disposing the valve piece in the gapped closed position when the inside of the flow path does not meet the standard flow pressure, and for biasing the valve piece with an elastic force to retreat to the open position when the inside of the flow path reaches the standard flow pressure.

[0062] The valve means may be the valve piece provided so as to be movable forward and backward with respect to a cylinder portion communicating in a direction intersecting a flow path such as a sprue, a runner, or a gate. The valve piece may be capable of closing the flow path to a gap-closed position. The valve piece may be, for example, a plate-like valve provided so as to be rotatable about an axis intersecting the flow direction of the flow path and shaped so as to be able to close to the gap-closed position, and an operating piece extending from the plate-like valve beyond the axis into the wall thickness of the molding die may be urged by an elastic urging means such as a spring in a direction to close the plate-like valve from an open position in which the plate-like valve is parallel to the flow path to a gap-closed position in which the plate-like valve is intersecting the flow path.

[0063] The present invention relates to a flow pressure regulator for a molding die, comprising: a cylinder portion drilled in at least either the gate of the movable or fixed type, or the middle portion of the runner immediately preceding the gate, so as to communicate in a direction intersecting with the flow path of the molten material; a valve piece as valve means having a tip shaped to be able to close with a gap so as to secure a gap between the wall surface of the flow path of the molten material and being freely provided between a gap closed position where a small cross-sectional area of ​​the flow path is secured from within the cylinder portion beyond the parting surface and an open position beyond the parting surface so as to open a cross-sectional area equivalent to the flow path; and elastic biasing means provided between a deep portion of the cylinder portion and the base end of the valve piece, for disposing the valve piece in the gap closed position when the inside of the flow path does not meet the standard flow pressure, and for biasing the valve piece with an elastic force to retreat to the open position when the inside of the flow path reaches the standard flow pressure.

[0064] When the above-mentioned flow pressure regulator is provided at least at either the gate or the middle part of the runner immediately before the gate, the flow pressure of the molten material immediately before it flows into the cavity is increased, so that the cavity can be filled more quickly and uniformly from the start of injection to the end of injection.

[0065] The flow pressure regulator may be installed at a location where the flow pressure of the flow path is reduced, immediately before a cavity, etc. For example, it may be installed at a corner or branch of the flow path, or at a location where the cross-sectional area of ​​the flow path changes, and as shown in the embodiment described later, it may be installed at a branch point of the runner, or in the middle of the runner immediately before a gate. Effect of the Invention

[0066] According to the molding die and the ejector mechanism used therein of the present invention, it is possible to shorten the ejector pins even in the case of a large die, facilitate high-precision machining of the ejector holes and ejector pins, improve the work efficiency of the die disassembly and assembly processes, and increase the durability of the die.

[0067] The molding die of the present invention and the flow pressure regulator used therein can achieve the excellent effects of maintaining and equalizing the flow pressure of the molten material in the flow passages of the sprue, runner or gate, removing air, gas, etc., and making the quality of the molded products of each cavity more uniform, thereby improving the defect rate. [Brief description of the drawings]

[0068] [Figure 1] (a) A cross-sectional view showing an ejector mechanism of the present invention. (a1) A cross-sectional view showing another example of the ejector mechanism of the present invention. (b) A cross-sectional view showing an ejector mechanism with a time lag ejector pin protruding. (b1) A cross-sectional view showing another example of an ejector mechanism with a time lag ejector pin protruding. (c) A cross-sectional view showing an ejector mechanism with all ejector pins protruding. (c1) A cross-sectional view showing another example of an ejector mechanism with all ejector pins protruding. [Diagram 2] (a) A cross-sectional view showing a molding die incorporating the ejector mechanism of the present invention, (b) A cross-sectional view showing the molding die with the movable die open, (c) A cross-sectional view showing an ejector mechanism with a standard ejector pin protruding, and (d) A cross-sectional view showing an ejector mechanism with a time lag ejector pin protruding with a delay. [Diagram 3] (a) A cross-sectional view showing another example of a molding die incorporating the ejector mechanism of the present invention. (b) A cross-sectional view showing another example of a molding die with a movable die open. (c) A cross-sectional view showing another example of an ejector mechanism with a standard ejector pin protruding. (d) A cross-sectional view showing another example of an ejector mechanism with a time lag ejector pin protruding with a delay. [Figure 4] (a) is a perspective view showing the protruding portion of the ejector pin with respect to the molded product, (b) is a perspective view showing a molded product with large warpage caused by simultaneously protruding all the ejector pins using a conventional molding die, and (c) is a perspective view showing a molded product with reduced warpage caused by staggering the timing of each ejector pin protruding using the molding die of the present invention. [Diagram 5] (a) is a perspective view showing the protruding portion of the ejector pin with respect to the molded product, (b) is a perspective view showing a molded product with large warpage caused by simultaneously protruding all the ejector pins using a conventional molding die, and (c) is a perspective view showing a molded product with reduced warpage caused by staggering the timing of each ejector pin protruding using the molding die of the present invention. [Figure 6] FIG. 2 is a perspective view showing an example of the arrangement of a flow pressure regulator in a flow path of a molten material in the molding die of the present invention. [Figure 7] 1A is a cross-sectional view showing the front and side of the flow pressure regulator of the present invention, and FIG. [Figure 8] 1A is a three-view diagram showing a valve piece of a flow pressure regulator, (b) is a three-view diagram showing a valve piece of a flow pressure regulator with a different tip shape, and (c) is a three-view diagram showing a valve piece of a flow pressure regulator with a different tip shape. [Figure 9] 1 is a graph showing the change in flow pressure of molten material over time from the start to the end of injection molding. [Figure 10] 1A is a conceptual diagram showing an initial state of molten material flowing into each cavity of a conventional multi-cavity molding die, and (b) is a conceptual diagram showing a state where molten material flowing into each cavity of a conventional multi-cavity molding die is finished being filled. [Figure 11] 1A is a conceptual diagram showing an initial state of molten material flowing into each cavity of the multi-cavity molding die of the present invention, and FIG. 1B is a conceptual diagram showing a state where the molten material flowing into each cavity of the multi-cavity molding die of the present invention has finished being filled. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0069] Hereinafter, a molding die 1 according to this embodiment and an ejector mechanism 5 and a flow pressure regulator 6 used therein will be specifically described with reference to the drawings. In particular, this embodiment shows a two-plate type molding die 1 equipped with a movable die 2, a fixed die 3, and an ejector box 4, but the molding die 1 may be of a three-plate or more type configuration, such as a three-plate type having a runner stripper plate (not shown).

[0070] The ejector mechanism 5 according to the present invention can be incorporated into the molding die 1 shown in Figures 1(a), (b) and (c). The molding die 1 has a plurality of ejector pins 51 inserted into each of a plurality of ejector holes EH so as to be able to freely appear and disappear, and an ejector plate 50 in an ejector box 4, and each ejector pin 51 can be either a standard ejector pin SEP or a time lag ejector pin TEP.

[0071] (Ejector mechanism 5 in which the time lag ejector pin TEP projects before the standard ejector pin SEP) The ejector plate 50 includes a driven plate EB1 and a driving plate EB2. The driven plate EB1 is disposed so that, when each standard ejector pin SEP is in the standby position shown in FIG. 1(a), it faces the wall facing the inside of the ejector box 4 of the movable mold 2 at a distance D1 that is equivalent to or exceeds the protrusion amount PA when each standard ejector pin SEP is in the protruding position shown in FIG. 1(c).

[0072] The drive plate EB2 is disposed against the wall of the driven plate EB1 opposite the movable mold 2 so as to face the driven plate EB1 across a distance D2 for generating a protrusion time lag when the standard ejector pins SEP and the time lag ejector pins TEP are disposed in their standby positions as shown in FIG. 1(a).

[0073] The driven plate EB2 is driven by the advancement and retreat of an ejector rod (not shown). The driven plate EB1 can be moved by the drive force transmitted by contact with the driven plate EB2 as it moves.

[0074] The standard ejector pin SEP consists of a driven pin portion SE1 and a drive pin portion SE2, and as shown in FIG. 1(a), the base end of the drive pin portion SE2 is connected to the driven plate EB1, and the tip of the driven pin portion SE1 can be set to a length that matches the wall of the cavity CV of the movable mold 2 when the driven plate EB1 is in the standby position.

[0075] The standard ejector pin SEP can have a standby biasing means SB consisting of a coil spring that biases the driven pin portion SE1 in the standby direction relative to the ejector hole EH of the movable mold 2 with a force weaker than the driving force of the ejector plate 50, and a standby position regulating means WR that regulates the driven pin portion SE1 to the standby position against the bias of the standby biasing means SB.

[0076] The standby biasing means SB can be configured such that a coil spring is mounted in a cylindrical space CD provided in the middle of the ejector hole EH of the movable mold 2, the driven pin portion SE1 is mounted so as to pass vertically through the center of the coil spring, the tip of the coil spring abuts against the tip of the cylindrical space CD (the edge of the ejector hole EH), and the base end of the coil spring abuts against a flange portion FG provided in the middle of the driven pin portion SE1.

[0077] The standby position regulating means WR may be composed of an annular flange AC provided at the end of a cylindrical bushing installed in the cylindrical space CD, and may regulate the retraction of the flange FG. Furthermore, it may be configured such that male threads are engraved on the outer peripheral walls of the cylindrical bushing and the annular flange AC, and a corresponding female thread is engraved on the inner peripheral wall of the cylindrical space CD, and a standby position adjustment mechanism (not shown) is provided to adjust the standby position of the driven pin portion SE1 in the forward and backward directions of the driven pin portion SE1.

[0078] As shown in Figure 1(a), when the follower plate EB1, follower pin portion SE1 and drive pin portion SE2 are each in their standby positions, the tip of the follower pin portion SE1 is aligned with the wall of the cavity CV of the movable mold 2, the base end of the follower pin portion SE1 is aligned with the wall facing the ejector box 4 of the movable mold 2, and further, the tip of the drive pin portion SE2 is aligned with the wall facing the ejector box 4 of the movable mold 2, so that the base end of the follower pin portion SE1 and the tip of the drive pin portion SE2 are constantly joined together.

[0079] The time lag ejector pin TEP comprises a driven pin portion TE1 and a driving pin portion TE2, and the driven pin portion TE1 has a protruding end that coincides with the wall of the cavity CV of the movable mold 2 when the time lag ejector pin TEP is in the standby position, a standby biasing means SB consisting of a coil spring that biases the driven pin portion TE1 in the standby direction toward the ejector hole EH of the movable mold 2 with a force weaker than the driving force of the ejector plate 50, and a standby position regulating means WR that regulates the driven pin portion TE1 to the standby position against the bias of the standby biasing means SB.

[0080] Furthermore, as shown in FIG. 1(a), the driven pin portion TE1 can have a split base end arranged at a position that coincides with the wall facing the inside of the ejector box 4 of the movable mold 2 when the time lag ejector pin TEP is in the standby position.

[0081] The drive pin portion TE2 is provided on the driving plate EB2 of the ejector plate 50, and when each ejector pin 51 (SEP, TEP) is in the standby position shown in Figure 1 (a), its divided tip is arranged at a timing adjustment position TPA where it directly abuts with the divided base end of the driven pin portion TE1 without any gap.

[0082] The standby biasing means SB is similar to that provided on the standard ejector pin SEP, and can be configured such that a coil spring is mounted in a cylindrical space CD provided in the middle of the ejector hole EH of the movable mold 2, the driven pin portion TE1 is mounted so as to pass vertically through the center of the coil spring, the tip of the coil spring abuts against the tip of the cylindrical space CD (the edge of the ejector hole EH), and the base end of the coil spring abuts against a flange portion FG provided in the middle of the driven pin portion TE1.

[0083] The standby position regulating means WR is similar to that provided on the standard ejector pin SEP, and can be composed of an annular flange portion AC provided at the end of an internal cylindrical bushing to regulate the retreat of the flange portion FG. Furthermore, it is possible for a male thread to be engraved on the outer peripheral wall of the cylindrical bushing and the annular flange portion AC, and for a corresponding female thread to be engraved on the inner peripheral wall of the cylindrical space CD, and for a standby position adjustment mechanism (not shown) to be provided that enables the standby position of the driven pin portion TE1 to be adjusted in the forward / backward direction.

[0084] The ejector mechanism 5 has a return pin RP, which is inserted into a return hole RH formed in the movable mold 2 and has a tip disposed in a standby position coinciding with the parting surface PL when the standard ejector pin SEP is in the standby position, as shown in Figures 1(a) and (b).

[0085] As shown in Figures 1(a) and (b), when the standard ejector pin SEP is in the standby position at its midpoint, the return pin RP has a flange-shaped seat FS integrated with the wall of the driven plate EB1 on the movable die 2 side, and a standby biasing means SB consisting of a coil spring is provided between the movable die 2 and the flange-shaped seat FS.

[0086] The standby biasing means SB can be configured to have a force weaker than the driving force of the ejector plate 50, and to press the flange-shaped seat portion FS of the return pin RP to retreat following the driven plate EB1 when the ejector plate 50 retreats to its standby position. The standby biasing means SB can be configured to have a force weaker than the driving force of the ejector plate 50, and to exert an elastic force capable of returning the driven plate EB1 to the standby position at a distance D1 from the wall of the movable mold 2 when the driving force of the ejector plate 50 is released.

[0087] The return pin RP has its base end slidably inserted into a guide hole GH formed in the driven plate EB1 and the driving plate EB2, and an extension tube portion EX is provided near the guide hole GH to the driving plate EB2. Within the extension tube portion EX, an elastic return means ERM consisting of a coil spring that exerts an elastic force weaker than the driving force of the ejector plate 50 can be provided so as to ensure a distance D2 for generating the protrusion time lag between the driven plate EB1 and the driving plate EB2.

[0088] A protective cylinder portion PC extending in the opposite direction to the driven plate EB1 is protruded from the guide hole GH of the driving plate EB2, so that the base end of the turn pin RP can be protected from contact with other objects.

[0089] Furthermore, as shown in FIG. 1(a1), the ejector mechanism 5 of the present invention has a single standard ejector pin SEP that is not divided, and is provided at its midpoint with standby biasing means SB consisting of a coil spring that biases the ejector hole EH of the movable mold 2 in the standby direction with a force weaker than the driving force of the ejector plate 50, and standby position regulating means WR that regulates the standard ejector pin SEP to the standby position against the bias of the standby biasing means SB.

[0090] 1(a1), the standard ejector pin SEP can be extended to a position where its base end coincides with the wall of the driven plate EB1 facing the movable mold 2 when the standard ejector pin SEP is in the standby position, and the length of the base end can be set so that the base end is always in contact with the driven plate EB1. A wear-resistant washer WS can be embedded in a replaceable manner in the portion of the driven plate EB1 where the base end comes into contact with the ground. A male screw is engraved on the outer periphery of the washer WS, and a corresponding female screw hole is drilled in the driven plate EB1, and a standby position adjustment mechanism (not shown) can be provided to adjust the standby position of the standard ejector pin SEP in the forward and backward directions.

[0091] As shown in FIG. 1(a1), when the time lag ejector pin TEP, the driven plate EB1 and the drive plate EB2 of the ejector plate 50 are in the standby position, the split base end of the driven pin portion TE1 is extended to a position coinciding with the wall of the driven plate EB1 facing the movable mold 2, and the split tip end of the drive pin portion TE2 is positioned at a position coinciding with the wall of the driven plate EB1 facing the movable mold 2.

[0092] (Operation example of molding die 1 and ejector mechanism 5) As shown in FIG. 1(a) or (a1), in the molding die 1 of the present invention, molten resin material is filled into the cavity as the molten material from an injection device (not shown) through a sprue of a fixed die (not shown), and after the molten material has cooled and solidified, the movable die 2 is removed from the fixed die.

[0093] 1(b) or (b1), the driving plate EB2 of the ejector plate 50 moves toward and joins with the driven plate EB1 under the driving force of an ejector rod (not shown), and the driving pin portion TE2 of the time lag ejector pin TEP and the driven pin portion TE1 joined thereto are raised by the distance D2 for generating a protrusion time lag against the biasing force of the standby biasing means SB, and the tip of the driven pin portion TE1 protrudes from the wall surface of the cavity CV by the same distance D2, and the driven pin portion TE1 pushes out a part of the molded product left in the cavity. At this time, the standard ejector pin SEP and the return pin RP remain in their standby positions, and the other part of the molded product corresponding to the standard ejector pin SEP remains in close contact with the cavity.

[0094] As shown in FIG. 1(c) or (c1), while maintaining their mutually joined state, the driving plate EB2 and the driven plate EB1 are moved further toward the movable mold 2, and the time lag ejector pin TEP, the standard ejector pin SEP and the return pin RP are protruded from the wall surface (or parting surface PL) of the cavity CV by the protrusion amount PA in FIG. 1(c) or (c1) against the biasing forces of their respective standby biasing means SB, and the molded product (not shown) is completely separated from the cavity CV and taken out from the molding die 1.

[0095] After the molded product has been removed, as shown in Figure 1(a) or (a1), the driving force from the ejector rod of the ejector plate 50 is released, and the driven plate EB1 and the driven plate EB2 retreat to their standby positions, and each standby biasing means SB moves the standard ejector pin SEP and the time lag ejector pin TEP toward each standby position regulating means WR, and also moves the return pin RP toward its standby position. Furthermore, when the movable mold 2 is joined to a fixed mold not shown, the return pin RP pushes the driven plate EB1 back to its standby position, and it is ready to fill with molten resin material again.

[0096] Furthermore, as shown in Figures 1(a), (b) and (c), when the time lag ejector pin TEP is in the standby position, when the split base end of the driven pin portion TE1 is aligned with the wall of the movable mold 2 on the ejector box 4 side, and when the split base end of the driven pin portion TE1 is aligned with the wall of the movable mold 2 side of the driven plate EB1 as shown in Figures 1(a1), (b1) and (c1), the effects of shear force and the like due to thermal deformation (thermal gradient) of the time lag ejector pin TEP between the movable mold 2, ejector box 4 and ejector plate 50 are eliminated.

[0097] (Ejector mechanism 5 in which the time lag ejector pin TEP projects with a delay from the standard ejector pin SEP) Moreover, the ejector mechanism 5 according to the present invention can be incorporated into the molding die 1 shown in Figures 2(a), (b), (c) and (d). The molding die 1 has a plurality of ejector pins 51 inserted into each of a plurality of ejector holes EH so as to be able to freely appear and disappear, and an ejector plate 50 in an ejector box 4, and each ejector pin 51 can be either a standard ejector pin SEP or a time lag ejector pin TEP.

[0098] When each standard ejector pin SEP is in the standby position shown in FIG. 2(a), the ejector plate 50 faces the wall facing the inside of the ejector box 4 of the movable mold 2 at a distance D1 that is at least equivalent to or exceeds the protrusion amount PA when each standard ejector pin SEP is in the protruding position shown in FIG. 2(d), and can be driven back and forth by the ejector rod EJ.

[0099] The standard ejector pin SEP has its base end connected to the ejector plate 50, and can be set to a length such that its tip coincides with the wall of the cavity CV of the movable mold 2 when the ejector plate 50 is in the standby position, as shown in FIG. 2(a).

[0100] The return pin RP has its base end connected to the ejector plate 50, and can be set to a length such that its tip coincides with the wall of the cavity CV of the movable mold 2 when the ejector plate 50 is in the standby position, as shown in Figure 2(a).

[0101] The time lag ejector pin TEP has a driven pin portion TE1 and a driving pin portion TE2. The driven pin portion TE1 may have a standby biasing means SB consisting of a coil spring that biases the driven pin portion TE1 in the standby direction with a force weaker than the driving force of the ejector plate 50, and a standby position regulating means WR that regulates the driven pin portion TE1 to the standby position against the bias of the standby biasing means SB.

[0102] The driven pin portion TE1 can be set to a length such that its tip coincides with the wall of the cavity CV of the movable mold 2 when no driving force is applied from the drive pin portion TE2 and the biasing force from the standby biasing means SB is regulated by the standby position regulating means WR. The standby biasing means SB and the standby position regulating means WR are similar to those described above. The same components are given the same reference numerals to avoid duplication of explanation. The driven pin portion TE1 can be set to a length such that its divided base end remains within the ejector hole EH of the movable mold 2.

[0103] The base end of the drive pin portion TE2 is integrated with the ejector plate 50. When the ejector plate 50 is in the standby position, the divided tip end of the drive pin portion TE2 can be arranged at a timing adjustment position TAP separated from the divided base end of the driven pin portion TE1 by a timing adjustment gap TAG corresponding to the protrusion amount PA.

[0104] (Another Operation Example of the Molding Die 1 and the Ejector Mechanism 5) As shown in Figures 2(a), (b), (c) and (d), in the molding die 1 of the present invention, molten resin material MM as molten material MM is filled into the cavity CV from an injection device not shown through the sprue FP1 of the fixed die 3, and after it has cooled and solidified, the movable die 2 is removed from the fixed die 3 as shown in Figure 2(b).

[0105] 2(c), the ejector plate 50 is operated by the driving force of the ejector rod EJ, the standard ejector pin SEP is protruded from the wall of the cavity CV (or the parting surface PL), and one part of the molded product MM is pushed out ahead of the other part. At this time, the return pin RP is protruded in the same manner as the standard ejector pin SEP. During this time, the drive pin portion TE2 is moved to reduce the timing adjustment gap TAG, but is maintained in a non-contact state with the driven pin portion TE1, and during that time, the protrusion timing of the time lag ejector pin TEP is delayed.

[0106] As the ejector plate 50 continues to move, the standard ejector pin SEP is further protruded, and the separation tip of the drive pin portion TE2 of the time lag ejector pin TEP moves the timing adjustment gap TAG and comes into contact with the separation base end of the driven pin portion TE1, and as shown in Figure 2(d), the tip of the driven pin portion TE1 protrudes from the wall of the cavity CV of the movable mold 2 by the protrusion amount PA, and the molded product MM is completely released from the cavity CV of the movable mold 2 and removed from the molding die 1.

[0107] After the molded product MM has been removed, as shown in FIG. 2(a), the driving force of the ejector rod EJ of the ejector plate 50 is released, the ejector plate 50 retreats toward the standby position, and the standby biasing means SB elastically biases the driven pin portion TE1 to the standby position regulating means WR, the time lag ejector pin TEP and the standard ejector pin SEP return to their standby positions, and when the movable mold 2 is joined to the fixed mold 3, the return pin RP reliably pushes the ejector plate 50 back to its standby position, and the mold is again ready to be filled with molten resin material MM.

[0108] Furthermore, as shown in Figures 2(a), (b), (c) and (d), when the time lag ejector pin TEP is in the standby position, if the split base end of the driven pin portion TE1 is set to a length that allows it to remain within the ejector hole EH of the movable mold 2, the effects of thermal deformation between the movable mold 2, the ejector box 4 and the ejector plate 50 are eliminated.

[0109] Furthermore, as shown in Figures 3(a), (b), (c) and (d), at least one of the driven pin portion TE1 or the driving pin portion TE2 of the time lag ejector pin TEP can be provided with a protrusion timing adjustment means PAM consisting of a screw mechanism and capable of changing the timing adjustment gap TAG between them.

[0110] The ejection timing adjustment means PAM can be, for example, such that the drive pin portion TE2 of the time lag ejector pin TEP is separated at its midpoint into a base end piece PX and a tip piece PT, the base end piece PX has a nut hole NH drilled from its tip to its base end side, the tip piece PT has a bolt portion BT hanging down from its base end, and a positioning nut PN is screwed into the midpoint of the bolt portion BT.

[0111] The bolt portion BT is screwed into the nut hole NH, the timing adjustment position TAP of the separated tip of the tip piece PT relative to the base end piece PX is adjusted forward and backward, and the positioning nut PN is tightened until it firmly abuts against the base end piece PX, and the separated tip of the tip piece PT is securely fixed to the timing adjustment position TAP relative to the base end piece PX. The molding die 1 provided with the projection timing adjustment means PAM makes it possible to easily adjust the timing adjustment gap TAG, and as shown in Figures 3(a), (b), (c) and (d), it is possible to carry out a series of injection molding steps, and the operation is similar to that shown in Figures 2(a), (b), (c) and (d), so that the same components are given the same reference numerals and their explanations are omitted.

[0112] As shown in FIG. 4(a), when a conventional molding die in which multiple ejector pins 51 all protrude at the same time is used, the rectangular plate-shaped molded product MM warps significantly, as shown in FIG. 4(b). However, according to any of the molding die 1 of the present invention shown in FIG. 1 to FIG. 3, the ejector pins 51 on the peripheral side of the rectangular plate-shaped molded product MM protrude later than those near the center, or the ejector pins 51 near the center of the molded product MM protrude before those on the peripheral side, thereby making it possible to significantly reduce warping, as shown in FIG. 4(c).

[0113] As shown in Figure 5(a), when a conventional molding die 1 in which multiple ejector pins 51 all protrude at the same time is used, a molded product MM in which a cylindrical protrusion is integrated near the center of a rectangular plate-like shape suffers from significant warping, as shown in Figure 5(b). However, when using any of the molding dies 1 of the present invention shown in Figures 1 to 3, the ejector pins 51 on the peripheral side of the molded product MM in which a cylindrical protrusion is integrated near the center of a rectangular plate-like shape protrude later than those near the center, or the ejector pins 51 near the center of the molded product MM, particularly in the part in which the cylindrical protrusion is integrated, protrude before those on the peripheral side, thereby making it possible to significantly reduce warping, as shown in Figure 5(c).

[0114] (Molding die 1 equipped with flow pressure regulator 6) As shown in Figures 6 and 7, the molding die 1 of the present invention can be provided with a flow pressure regulator 6 equipped with an elastic biasing means BM that has a valve means T provided at least at one of the sprue FP1, runner FP2 or gate FP3 of the movable die 2 or fixed die 3, that crosses the flow path FP of the molten material MM beyond the parting surface PL and is freely movable between a gapped closed position GCP in which a small cross-sectional area of ​​the flow path FP is secured in the crossing direction and an open position OPP beyond the parting surface PL, and that presses the valve means T to the gapped closed position GCP when the inside of the flow path FP of the molten material MM does not meet the standard flow pressure, and that has an elastic force that biases the valve means T to the open position OPP beyond the parting surface PL when the standard flow pressure is reached.

[0115] As shown in FIG. 6, the flow pressure regulator 6 according to the present invention can be disposed at each of the branching point A of the runner FP2 of the movable die 2 or the fixed die 3 of the molding die 1, and at a position B immediately before the gate FP3 of the same runner FP2.

[0116] Also, as shown in Figures 6 and 11(b), the flow pressure regulator 6 of the present invention can be provided either at position B immediately before each gate FP3 of each runner FP2, or at a midpoint C of each gate FP3.

[0117] The flow pressure regulator 6 has a valve means T consisting of a cylinder portion CY drilled into either the movable mold 2 or the fixed mold 3 so as to communicate in a direction intersecting with the flow path FP of the molten resin material MM as the molten material MM at at least one of the sprue FP1, runner FP2 or gate FP3, and a valve piece KM having a tip shaped to be capable of closing a gap so as to secure a gap between the wall surface of the flow path FP of the molten resin material MM and arranged to be freely moved between a gap closed position GCP where a small cross-sectional area of ​​the flow path FP is secured from within the cylinder portion CY beyond the parting surface PL, and an open position OPP beyond the parting surface PL.

[0118] The valve element KM may be provided with an elastic biasing means BM which is provided between a deep portion of the cylinder portion CY and the base end of the valve element KM and which disposes the valve element KM in the gapped closed position GCP when the inside of the flow path FP does not reach the standard flow pressure, and which has an elastic force to bias the valve element KM backward to the open position OPP when the inside of the flow path FP reaches the standard flow pressure.

[0119] As shown in Figures 7(a) and (b), the cylinder section CY is provided with a bush hole BH drilled in a direction intersecting with a flow path FP of either the pull FP1, the runner FP2 or the gate FP3 for either the movable type 2 or the fixed type 3, and a guide hole GH for the valve piece KM that is continuous with the bush hole BH, has a smaller diameter than the bush hole BH, and opens into the flow path FP, and a guide bush GB can be removably attached to the bush hole BH.

[0120] The guide bush GB is composed of a tip bush GB1 and a base bush GB2, and the tip bush GB1 has a tip hole GBH that is continuous with the guide hole GH and a short cylindrical portion GB1 with an inner diameter larger than the diameter of the guide hole GH, and the dimensions are set so that the reciprocating movement of the base of the valve piece KM is permitted within the length range of the short cylindrical portion GB1. The tip bush GB1 can be attached to the bush hole BH near the flow path FP.

[0121] The base bush GB2 is attached to the bush hole BH so as to abut against the base end of the short cylindrical portion GB1 on the opposite side to the tip hole GBH of the tip bush GB1, and a spring hole HS having an inner diameter smaller than the inner diameter of the short cylindrical portion GB1 is drilled therein, and a coil spring BM as an elastic biasing means BM extending into the tip bush GB1 is attached to the spring hole HS.

[0122] The valve piece KM can be configured as follows: a rod-shaped valve portion KM that is capable of sliding freely back and forth through the tip hole GBH and the guide hole GH; and a flange end FE that is arranged within the tip bush GB1 of the rod-shaped valve portion KM, has a diameter set to be less than the inner diameter of the short cylindrical portion GB1 and larger than the tip hole GBH and the guide hole GH, and is capable of sliding back and forth within the length range of the short cylindrical portion GB1; and the coil spring BM is abutted against the flange end FE and is elastically urged toward the tip end (protruding direction).

[0123] When the tip of the rod-shaped valve portion KM facing the flow passage FP is maximally protruded toward the opposing inner wall of the flow passage FP, the valve piece KM can be arranged in a gap closed position GCP having an opening degree of, for example, several percent to several tens of percent between the tip of the rod-shaped valve portion KM and the opposing inner wall of the flow passage FP, relative to an open opening degree of 100%.

[0124] The opening degree of the valve piece KM in the gap closed position GCP can be, for example, 1 to 10%, 10 to 20%, or 20 to 50% relative to the 100% opening degree of the open flow path FP.

[0125] The standard flow pressure can be set to a pressure that is equal to or lower than the inflow pressure (e.g., 30 MPa) of the molten resin material MM flowing from the injection device to the sprue FP1, and exceeds the flow pressure (e.g., 10 MPa) in the flow path FP reduced by the pressure loss from the runner FP2 to the gate FP3 of a conventional mold.

[0126] The standard flow pressure may be, for example, 10 to 30 MPa or 15 MPa. Also, for example, it may be, for example, 20 to 30 MPa or 25 MPa. For example, it may be 30 MPa. The standard flow pressure may be, for example, 0.2 to 0.002 kg / mm2.

[0127] The shape of the tip of the rod-shaped valve portion KM of the valve piece KM is, as shown in Figures 7(a) and (b), a gentle spherical shape with a radius of curvature larger than the radius of the rod-shaped valve portion KM, and a relief edge ER is provided in which the periphery of the spherical shape is chamfered with a constant radius of curvature smaller than the radius of the rod-shaped valve portion KM. As shown in Figure 7(b) , when the valve piece KM is moved to the open position OPP, the relief edge ER is retracted beyond the parting surface PL of the flow path FP to the open position OPP, and the flow path FP is connected to the parting surface PL.

[0128] As shown in Fig. 8(a), the valve piece KM may have a tip end of the rod-shaped valve portion KM with a flat tip end and a corner chamfered edge to form a relief edge ER, which is an upside-down trapezoidal cross-sectional shape. As shown in Fig. 8(b), the valve piece KM may have a tip end of the rod-shaped valve portion KM with a flat tip end and a corner chamfered edge to form a relief edge ER. As shown in Fig. 8(c), the valve piece KM may have a tip end of the rod-shaped valve portion KM with a semicircular spherical cross-sectional shape, which is a spherical tip end and a peripheral wall of the spherical tip end and a relief edge ER.

[0129] The outer diameter of the tip end region of the rod-shaped valve portion KM of each valve piece KM shown in Figures 7(a),(b) and 8(a),(b) and (c) that closes the flow passage FP with a gap can be set to 0.3 to 0.8 mm so as to correspond to the inner diameter of the flow passage FP. The outer diameter of the tip end region of the rod-shaped valve portion KM of each valve piece KM shown in Figures 7(a),(b) and 8(a),(b) and (c) that closes the flow passage FP with a gap can be set to 0.3 to 0.8 cm so as to correspond to the inner diameter of the flow passage FP.

[0130] In addition to the shapes mentioned above, the relief edge ER can be chamfered in other shapes such as spoon chamfered, inner round chamfered, monkey cheek chamfered, spur chamfered, ginkgo chamfered, neat chamfered, bottom chamfered, string chamfered, and gourd chamfered.

[0131] (Molding process using a molding die 1 equipped with a flow pressure regulator 6) As shown in Figures 6, 7 and 9, when molten resin material MM as molten material MM flows in from the sprue FP1 at a flow pressure of 30 MPa, the flow pressure drops to less than 10 MPa before it reaches the flow pressure regulator 6 at the branching point A of the runner FP2 branching off from the sprue FP1.

[0132] The flow pressure regulator 6 at the branch point A of the runner FP2 can be set to remain in the gap closed position GCP until the standard flow pressure of 30 MPa is reached, for example. When the flow pressure in the runner FP2 from the sprue FP1 to the branch point A is less than 30 MPa, the flow pressure regulator 6 at the branch point A, whose standard flow pressure is set to 30 MPa, remains in the gap closed position GCP and maintains a state in which the flow of the molten resin material MM is almost completely blocked, during which the pressure of the molten resin material MM gradually increases, and gas and entrained air generated from the molten resin material MM are discharged to the outside of the molding die 1 through the parting surface PL.

[0133] As shown in A of Fig. 9, when the flow pressure at the branch point A exceeds 30 MPa, the valve piece KM is retracted to the open position OPP against the biasing force of the coil spring BM as shown in Fig. 7(b). The relief edge ER of the rod-shaped valve part KM retracted to the open position OPP retracts beyond the parting surface area PL and communicates the inside of the flow path FP with the parting surface area PL, so that even at the branch point A where the flow pressure regulator 6 is provided, gas generated by the molten resin material MM and mixed air are released to the outside through the parting surface PL.

[0134] When the flow pressure regulator 6 at the branch point A is opened, the molten resin material MM flows into the flow path FP from each branch point A of each runner FP2 to the flow pressure regulator 6 at the position B immediately before each gate FP3.

[0135] The flow pressure regulator 6 at position B immediately before each gate FP3 may have a standard flow pressure set to, for example, 25 MPa, and the flow pressure regulator 6 at position B immediately before each gate FP3 may have a standard flow pressure set to, for example, 30 MPa.

[0136] The valve piece KM of the flow pressure regulator 6 can be set to stay in the gap closed position GCP until the flow pressure at the position B immediately before the gate FP3 reaches, for example, the standard flow pressure of 25 MPa by changing the coil spring BM which is the elastic biasing means BM, or can be set to stay in the gap closed position GCP until the flow pressure at the position B immediately before the gate FP3 reaches, for example, the standard flow pressure of 30 MPa.

[0137] If the flow pressure from each branch point A of each runner FP2 to position B just before each gate FP3 is less than 25 MPa (or 30 MPa), the valve piece KM remains in the gap closed position GCP, maintaining a state in which the flow of the molten resin material MM is almost completely blocked.During this time, the pressure of the molten resin material MM gradually increases, and gas and entrained air generated by the molten resin material MM are discharged outside the molding die 1 through the parting surface PL.

[0138] As shown in FIG. 9B, when the flow pressure at position B immediately before each gate FP3 of each runner FP2 reaches 25 MPa (or 30 MPa), the valve piece KM is moved back to the open position OPP against the biasing force of the coil spring BM.

[0139] As shown in CV of Figure 9, when each flow pressure regulator 6 at position B just before each gate FP3 is opened, the molten resin material MM flows into each cavity CV from position B just before each gate FP3 through each gate FP3 while maintaining a flow pressure of 25 MPa or more (or 30 MPa).

[0140] As shown in Fig. 6, the molten resin material MM is uniformly flowed into each cavity CV at a flow pressure of 25 MPa or more (or 30 MPa), making it possible to mold a homogeneous and high-quality molded product MM. For example, in the case of a molding die 1 having a plurality of cavities CV at different distances from a sprue FP1 as shown by F1, F2, and F3 in Figs. 11(a) and (b), if the flow pressure regulator 6 is provided at the gate FP3 of each cavity CV, it is possible to make the molten resin material MM flow into each cavity CV at the same flow pressure of 25 MPa or more (or 30 MPa).

[0141] As shown by the two-dot chain line in Figure 9, in a conventional mold, after the molten resin material MM reaches all of the cavities and each cavity is fully filled, the flow pressure is increased and the molten resin material MM is held and cooled while still containing gas or air. However, in the molding mold 1 equipped with the flow pressure regulator 6 of the present invention, the flow pressure is increased to 25 MPa or more (or 30 MPa) at each of the branching point A of the runner FP2 and at position B just before the gate FP3 of each runner FP2, and each cavity CV is filled with the flow pressure of 25 MPa (or 30 MPa). Therefore, each cavity CV is filled more quickly than in a conventional mold, which shortens the molding time, homogenizes the quality of the molded product MM, and increases the rate of non-defective products. [Industrial Applicability]

[0142] The molding die of the present invention, and the ejector mechanism and flow pressure regulator used therein, can be used to mold synthetic resins, metals, food, medicines, and other molten materials (fillers). [Explanation of symbols]

[0143] 1 Molding mold 2 Movable type 3 Fixed type 4 Ejector Box PL parting surface CV Cavity FP Melt material MM flow path FP1 same sprue FP2 Same runner FP3 Same Gate 5 Ejector mechanism EH Ejector hole 50 Ejector plate EB1 Same driven plate D1 Distance from the wall of the movable type 2 GH Same guide hole WS same washer D2 Distance for generating protruding time lag EB2 main drive plate PC same protective cylinder part EJ Ejector Rod 51 Ejector pin SEP Standard Ejector Pin SE1 Same Follower pin part SE2 Same drive pin part FG Flange part PA Same protrusion amount TEP Time Lag Ejector Pin TE1 Same Follower pin part SB Same Standby activation means CD Cylindrical Space FG Flange part WR Same standby position regulating means AC Annular flange TE2 Same Drive pin part PT same tip piece PX Same Base piece TAG Same Timing adjustment gap TAP Same timing adjustment position PAM Projection timing adjustment means BT same bolt part PN Same Positioning Nut NH same nut hole RP Return Pin FS Same flange-shaped seat SB Same Standby activation means ERM Elastic Return Means RH Same return hole GH Same guide hole EX Same extension tube 6 Flow Pressure Regulator T Valve means CY Cylinder section BH Bush Hall GB Guide bush GB1 Same end bush (tube end) GBH Same tip hole GB2 Same base bush HS Same Spring hole GH Same guide hole KM same valve piece (rod-shaped valve part) ER Same escape periphery FE same flange end BM Same elastic biasing means GCP same gap closed position OPP same open position A Runner FP2 branching point B Runner FP2, just before gate FP3 C Same Gate FP3 midway MM Molten resin material (molten material, molded product)

Claims

1. A molding die having at least a movable die, a fixed die, and an ejector box, a cavity being formed between parting surfaces, a flow path reaching the cavity from the outside being provided, and a plurality of ejector holes being provided in the movable die, A plurality of ejector pins are inserted into each of the ejector holes so as to be able to freely appear and disappear; an ejector plate in the ejector box; having Each ejector pin is either a standard ejector pin or a time lag ejector pin; The time lag ejector pin comprises a driven pin portion and a driving pin portion, The driven pin portion is a protruding end that coincides with a wall of the cavity of the movable mold when the time lag ejector pin is in a standby position; a standby biasing means for biasing the driven pin portion in a standby direction with a force weaker than the driving force of the ejector plate with respect to the movable ejector hole; a standby position restricting means for restricting the driven pin portion to a standby position against the biasing force of the standby biasing means; a split base end disposed in either the ejector hole when the time lag ejector pin is in a standby position or in the ejector plate when the time lag ejector pin is in a standby position; having The drive pin portion is a timing adjustment position TAP is provided on the ejector plate, and when each ejector pin is in a standby position, a divided tip end is disposed at either one of a timing adjustment position TAP at which a timing adjustment gap is provided between the divided base end of the driven pin portion and the divided base end of the driven pin portion or the divided tip end is directly abutted without a gap; An ejector mechanism, A molding die comprising:

2. A molding die having at least a movable die, a fixed die, and an ejector box, a cavity being formed between parting surfaces, at least one of a sprue, a runner, and a gate being provided to reach the cavity from the outside, and a plurality of ejector holes penetrating from a wall of the cavity of the movable die to the ejector box, A plurality of ejector pins are inserted into each of the ejector holes so as to be able to freely appear and disappear; an ejector plate in the ejector box; having Each ejector pin is either a standard ejector pin or a time lag ejector pin; The ejector plate comprises: a driven plate that faces the wall of the movable die at a distance corresponding to at least the amount of protrusion of each standard ejector pin when the standard ejector pin is at a standby position; And, a driving plate which faces a wall of the driven plate opposite to the movable die at a distance for generating a time lag when each of the standard ejector pins and the time lag ejector pins is disposed at a standby position, the driving plate protruding from the wall of the driven plate opposite to the movable die; The standard ejector pin is a base end is connected to the driven plate, and a tip end is set to a length that matches a wall of the cavity of the movable mold when the driven plate is in a standby position; The time lag ejector pin is a driven pin portion disposed on the cavity side; a drive pin portion disposed on the ejector plate side; The driven pin portion is a protruding end that coincides with a wall of the cavity of the movable mold when the time lag ejector pin is in a standby position; a standby biasing means for biasing the driven pin portion in a standby direction with a force weaker than the driving force of the ejector plate with respect to the movable ejector hole; a standby position restricting means for restricting the driven pin portion to a standby position against the biasing force of the standby biasing means; a split base end disposed in any one of the following positions when the time lag ejector pin is in a standby position: inside the ejector hole of the movable mold, on a wall facing the inside of the ejector box of the movable mold, or on a wall of the driven plate facing the movable mold or a wall facing the driving plate when the time lag ejector pin is in a standby position; having The drive pin portion is a split tip end is disposed at a timing adjustment position provided on a driving plate of the ejector plate, and when each ejector pin is in a standby position, the split tip end is disposed at either one of the timing adjustment positions where a timing adjustment gap is provided between the split base end of the driven pin portion and the split base end of the driven pin portion or the split tip end is directly abutted without any gap; An ejector mechanism, A molding die comprising:

3. A plurality of ejector pins are inserted through the plurality of ejector holes so as to be able to freely appear and disappear; an ejector plate in the ejector box; having Each ejector pin is either a standard ejector pin or a time lag ejector pin; The ejector plate comprises: a driven plate that faces the wall of the movable die at a distance corresponding to at least the amount of protrusion of each standard ejector pin when the standard ejector pin is at a standby position; And, a driving plate which faces a wall of the driven plate opposite to the movable die at a distance for generating a time lag when each of the standard ejector pins and the time lag ejector pins is disposed at a standby position, the driving plate protruding from the wall of the driven plate opposite to the movable die; The standard ejector pin is a base end is connected to the driven plate, and a tip end is set to a length that matches a wall of the cavity of the movable mold when the driven plate is in a standby position; The time lag ejector pin is a driven pin portion disposed on the cavity side; a drive pin portion disposed on the ejector plate side; The driven pin portion is a protruding end that coincides with a wall of the cavity of the movable mold when the time lag ejector pin is in a standby position; a standby biasing means for biasing the driven pin portion in a standby direction with a force weaker than the driving force of the ejector plate with respect to the movable ejector hole; a standby position restricting means for restricting the driven pin portion to a standby position against the biasing force of the standby biasing means; a split base end disposed in any one of the following positions when the time lag ejector pin is in a standby position: inside the ejector hole of the movable mold, on a wall facing the inside of the ejector box of the movable mold, or on a wall of the driven plate facing the movable mold or a wall facing the driving plate when the time lag ejector pin is in a standby position; having The drive pin portion is a split tip end of the driven pin portion is disposed at a timing adjustment position where a timing adjustment gap is provided between the split base end of the driven pin portion and the split tip end of the driven pin portion, or the split tip end is disposed at a timing adjustment position where a timing adjustment gap is provided between the split base end of the driven pin portion and the split tip end of the driven pin portion and the split tip end is directly abutted with no gap.

3. An ejector mechanism for the molding die according to claim 2.

4. The time lag ejector pin is The drive pin portion is 4. The ejector mechanism according to claim 3, wherein the ejector pins are provided on a driving plate of the ejector plate, and when each ejector pin is in a standby position, a split tip end is disposed at a timing adjustment position where it directly abuts, without any gap, against a split base end of the driven pin portion.

5. The time lag ejector pin is The drive pin portion is 4. The ejector mechanism according to claim 3, wherein the ejector pins are protrudingly provided on a driving plate of the ejector plate, and when each ejector pin is in a standby position, a divided tip end is disposed at a timing adjustment position which separates from the divided base end of the driven pin portion a timing adjustment gap which is either equal to a distance for generating a protrusion time lag between the driving plate and the driven plate in the standby position or shorter than the distance for generating the protrusion time lag.

6. The time lag ejector pin is The drive pin portion is 4. The ejector mechanism according to claim 3, wherein the ejector pins are provided on a driving plate of the ejector plate so that, when each ejector pin is in a standby position, a divided tip end is disposed at a timing adjustment position which separates from the divided base end of the driven pin portion a timing adjustment gap which exceeds a distance for generating a projection time lag between the driving plate and the driven plate in the standby position.

7. The time lag ejector pin is 4. The ejector mechanism according to claim 3, wherein at least one of said driven pin portion and said driving pin portion is provided with a projection timing adjustment means, which is made of a screw mechanism and can change the timing adjustment gap therebetween.

8. a valve means provided at least at one location of a movable or fixed sprue, runner or gate, crossing a flow path of the molten material beyond the parting surface, and capable of moving back and forth between a gapped closed position in which a small cross-sectional area of ​​the flow path is secured in the crossing direction, and an open position in which the cross-sectional area of ​​the flow path is opened to an extent equivalent to the cross-sectional area of ​​the flow path; an elastic biasing means for pressing the valve means to the gap closed position when the pressure in the flow path of the molten material is less than the standard flow pressure, and for biasing the valve means by an elastic force to move the valve means back to the open position when the standard flow pressure is reached; 3. The molding die according to claim 1, further comprising a flow pressure regulator comprising:

9. A cylinder portion is provided at least at one location of a movable or fixed sprue, runner, or gate so as to communicate in a direction intersecting the flow path of the molten material; a valve piece as a valve means having a tip end shaped to secure a gap between the wall surface of the flow path of the molten material and the tip end capable of closing the gap, the valve piece being provided so as to be movable between a gap closing position from inside the cylinder portion beyond the parting surface to secure a small cross-sectional area of ​​the flow path, and an open position beyond the parting surface to open a cross-sectional area equivalent to the flow path; an elastic biasing means provided between a deep portion of the cylinder portion and a base end of the valve piece, for disposing the valve piece in the gapped closed position when the inside of the flow passage does not satisfy the standard flow pressure, and for biasing the valve piece with an elastic force to retreat to the open position when the inside of the flow passage reaches the standard flow pressure; 3. The molding die according to claim 1, further comprising a flow pressure regulator comprising:

10. a cylinder portion formed so as to communicate with at least the molten material flow path of the movable mold or the fixed mold in a direction crossing the flow path; a valve piece as a valve means having a tip end shaped to secure a gap between the wall surface of the flow path of the molten material and the tip end capable of closing the gap, the valve piece being provided so as to be movable between a gap closing position from inside the cylinder portion beyond the parting surface to secure a small cross-sectional area of ​​the flow path, and an open position beyond the parting surface to open a cross-sectional area equivalent to the flow path; an elastic biasing means provided between a deep portion of the cylinder portion and a base end of the valve piece, for disposing the valve piece in the gapped closed position when the inside of the flow passage does not satisfy the standard flow pressure, and for biasing the valve piece with an elastic force to retreat to the open position when the inside of the flow passage reaches the standard flow pressure; 3. The flow pressure regulator of the molding die according to claim 1 or 2, comprising:

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