JP5758476B2 - Injection molding machine - Google Patents

Description

  The present disclosure relates to an injection molding machine.

  Conventionally, in the injection molding of the resin part to be disposed in the lead frame while keeping the thermoplastic resin in a fluid state by heating the runner part of the resin molding die, an arbitrary number of resin molding scheduled parts of the lead frame N gates and cavities, which are arbitrarily arranged at equal intervals, are provided for each N pitch, and between the first injection molding and the Nth injection molding. An injection molding method characterized by repeating N-1 times pitch feed and then repeating N × (n-1) +1 pitch feed as one cycle is known (for example, see Patent Document 1). .

  Also, it is a resin-sealed mold for clamping a lead frame on which a semiconductor chip is mounted and sealing a part of the lead frame with a resin. A resin-sealed mold including an eject pin for releasing from the surface is disclosed (for example, see Patent Document 2).

JP 2007-253350 A JP 2009-148934 JP

  By the way, when the eject pin is moved in order to release the molded product after resin sealing onto the hoop material from the mold surface, the hoop material is long in the lateral direction, which causes a problem that the hoop material bends.

  Therefore, an object of the present disclosure is to provide a molding machine that can reduce the deflection of the hoop material accompanying the ejector operation.

According to one aspect of the present disclosure, an injection molding machine including a resin molding die and an ejector mechanism,
Protruding means for projecting a hoop material in the mold closing direction outside the mold, the projecting means operating in synchronization with the ejector operation of the ejector mechanism by extending a crosshead of the ejector mechanism, and the ejector The mechanism is provided on a fixed platen or a movable platen, a hollow portion penetrating in the hoop feed direction is formed in the fixed platen or the movable platen, and a cross head of the ejector mechanism is extended so as to penetrate the hollow portion. An injection molding machine is provided.

  According to the present disclosure, it is possible to obtain a molding machine that can reduce the deflection of the hoop material accompanying the ejector operation.

It is a figure which shows the single-piece structure of the hot runner 10 which may be used with the resin molding die by this invention. It is a figure which shows the single-piece | unit structure of the hot runner 20 which may be used with the resin molding die by this invention. It is a top view which shows an example of the hoop material 100 which may be used with the resin molding die by this invention. It is a top view which shows an example of the hot runner arrangement | positioning aspect in the resin molding die by this invention by the relationship with the hoop material. It is a figure which shows the flow of injection molding implement | achieved by the hot runner arrangement | sequence aspect shown in FIG. It is sectional drawing which shows the main structures of the molding machine 600 by one Example of this invention. 6 is a cross-sectional view showing a main cross section of a stationary platen 620 of the molding machine 600. FIG. It is sectional drawing which shows the main structures of the molding machine 800 by other one Example of this invention. It is sectional drawing which shows the main structures of the molding machine 900 by further another Example of this invention.

  Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram showing a single product configuration of a hot runner 20 that may be used in a resin mold according to the present invention. FIG. 1 shows a hot runner 10 having a single hot runner nozzle 12, FIG. 1 (A) shows a top view of the hot runner nozzle 12 as viewed in the axial direction, and FIG. 1 (B) shows a hot runner. The side view including the axial direction of the nozzle 12 is shown. When a plurality of hot runners 10 are provided in a row, the interval L between the hot runner nozzles 12 of adjacent hot runners 10 is L = l1 + l2.

  FIG. 2 is a diagram showing a single product configuration of another hot runner 20 that may be used in the resin molding die according to the present invention. FIG. 1 shows a dual-type hot runner 20 having two hot runner nozzles 22, FIG. 2A shows a top view of the hot runner nozzle 22 in the axial direction, and FIG. The side view including the axial direction of the hot runner nozzle 22 is shown. When this hot runner 20 is used, the interval L between adjacent hot runner nozzles 22 is determined as shown in the figure.

  Note that the configuration of the hot runner to which the present invention is applied is not limited to that shown in FIGS. 1 and 2, and a hot runner of a triple system or more such as a triple system may be used. Further, for example, a plurality of hot runners 20 shown in FIG. 2 may be arranged in a row, and four or more hot runner nozzles may be arranged in one row. In the following, a case where the hot runner 20 shown in FIG. 2 is used will be described as a representative in order to prevent the description from becoming complicated.

  FIG. 3 is a plan view showing an example of a hoop material 100 that may be used in the resin molding die according to the present invention. FIG. 3 is a plan view of the hoop material 100 viewed in the direction perpendicular to the plane. The hoop material 100 is typically made of a metal material.

  In the hoop material 100, resin molding scheduled portions are regularly set in a grid pattern along a hoop feed direction line and a row direction line corresponding to the feed direction of the hoop material 100. In the example shown in FIG. 3, eight resin molding scheduled portions 101 to 108 are provided on the line in the column direction.

  The configuration of the hoop material that may be used in the resin molding die according to the present invention is not limited to that shown in FIG. 3, and two or more resins are arranged along the column direction line perpendicular to the hoop feed direction line. It is optional as long as it has a part to be molded.

  Here, the interval between the resin molding scheduled portions along the row direction line of the hoop material 100 is defined as Lf. That is, the interval between the resin molding scheduled portions 101 and 102, the interval between the resin molding scheduled portions 102 and 103, the interval between the resin molding scheduled portions 103 and 104, and the like are assumed to be the same Lf. The interval Lf between the resin molding scheduled portions is generally smaller than the interval L between the hot runner nozzles 22 described above. This is due to the progress of downsizing of the resin molding scheduled portion. In addition, it is advantageous from the viewpoint of increasing throughput to set as many resin molding scheduled portions as possible on one hoop material 100, whereas the interval L between the hot runner nozzles 22 is the structure of the hot runner nozzles 22. This is because there is a limit to the reduction from the above restrictions (particularly the restrictions on the relation of mounting the heater).

  Here, as an example, it is assumed that the interval L between the hot runner nozzles 22 is four times the interval Lf between the resin molding scheduled portions. That is, L = 4Lf. When two or more hot runner nozzles are arranged in one row (a row along the row direction line), the interval L between the hot runner nozzles is twice or three times the interval Lf between the resin molding scheduled portions. In addition, it is desirable to be an integer multiple.

  FIG. 4 is a plan view showing an example of a hot runner arrangement mode in the resin mold according to the present invention in relation to the hoop material 100. FIG. 4 is a plan view of the hoop material 100 viewed in the direction perpendicular to the plane.

  In FIG. 4, eight hot runners 20 shown in FIG. 2 are provided. Here, the eight hot runners are respectively used in order of 201 to 208 in the feed direction of the hoop material 100 from the top side. Instruct the hot runner nozzles of each hot runner 201-208 at 221-228, respectively.

  As shown in FIG. 4, the hot runners 201 to 208 are arranged in a direction perpendicular to the feeding direction of the hoop material 100. That is, the hot runners 201 to 208 are arranged in parallel to the row direction line of the hoop material 100.

  The hot runners 201 to 204 (first hot runner group) are arranged in the feeding direction of the hoop material 100 so that the row direction lines of the hoop material 100 are spaced one by one. That is, the hot runners 201 to 204 are arranged so as to be separated from each other by two lines in the row direction line of the hoop material 100 in the feeding direction of the hoop material 100. Further, the hot runners 201 to 204 are arranged so as to be offset from each other by one line (= Lf) of the hoop feed direction line of the hoop material 100 in a direction perpendicular to the feed direction of the hoop material 100 (that is, the row direction). Yes. In other words, the hot runner 204 is arranged offset from the hot runner 203 by one line of the hoop feed direction line of the hoop material 100 in the direction perpendicular to the feed direction of the hoop material 100 (downward in the drawing). The hot runner 203 is similarly offset from the hot runner 202 by one line in the hoop feed direction line, and the hot runner 202 is similarly arranged in the hoop feed direction line with respect to the hot runner 201. They are offset by an amount.

  Similarly, the hot runners 205 to 208 (second hot runner group) are arranged with a line in the row direction of the hoop material 100 one by one in the feed direction of the hoop material 100. That is, the hot runners 205 to 208 are arranged apart from each other by two lines in the row direction of the hoop material 100 in the feeding direction of the hoop material 100. Further, the hot runners 205 to 208 are arranged so as to be offset from each other by one line of the hoop feed direction line of the hoop material 100 in the direction perpendicular to the feed direction of the hoop material 100 (that is, the row direction). That is, the hot runner 208 is offset from the hot runner 207 by one line of the hoop feed direction line of the hoop material 100 in a direction perpendicular to the feed direction of the hoop material 100 (downward in the drawing). Similarly, the hot runner 207 is offset from the hot runner 206 by one line in the hoop feed direction line, and the hot runner 206 is similarly arranged in the hoop feed direction line by one line. They are offset by an amount.

  The hot runner 204 is arranged away from the hot runner 205 by three lines in the line direction of the hoop material 100 in the feeding direction of the hoop material 100. The hot runner 201 and the hot runner 205 are not offset in the direction perpendicular to the feeding direction of the hoop material 100, and the hot runner 202 and the hot runner 206 are not offset in the direction perpendicular to the feeding direction of the hoop material 100. The hot runner 203 and the hot runner 207 are not offset in the direction perpendicular to the feeding direction of the hoop material 100, and the hot runner 204 and the hot runner 208 are offset in the direction perpendicular to the feeding direction of the hoop material 100. Not. More specifically, the hot runner 201 includes two hot runner nozzles 221 that are aligned with the first and fifth hoop feed direction lines from the top of the hoop material 100 in the drawing. Further, the hot runner 205 includes two hot runner nozzles 225 aligned with the first and fifth hoop feed direction lines from the top of the hoop material 100 in the drawing. Similarly, the hot runner 202 includes two hot runner nozzles 222 aligned with the second and sixth hoop feed direction lines from the top of the hoop material 100 in the drawing. Further, the hot runner 206 includes two hot runner nozzles 226 aligned with the second and sixth hoop feed direction lines from the top of the hoop material 100 in the drawing. Similarly, the hot runner 203 includes two hot runner nozzles 223 aligned with the third and seventh hoop feed direction lines from the top of the hoop material 100 in the drawing. Further, the hot runner 207 includes two hot runner nozzles 227 aligned with the third and seventh hoop feed direction lines from the top of the hoop material 100 in the drawing. Similarly, the hot runner 204 includes two hot runner nozzles 224 aligned with the fourth and eighth hoop feed direction lines from the top of the hoop material 100 in the drawing. Further, the hot runner 208 includes two hot runner nozzles 228 aligned with the fourth and eighth hoop feed direction lines from the top of the hoop material 100 in the drawing.

  In the example shown in FIG. 4, the hoop material 100 is fed by two pitches in the feeding direction indicated by P in the drawing. Here, one pitch corresponds to the interval between adjacent resin molding scheduled portions in the hoop material 100 in the feed direction of the hoop material 100, and corresponds to two lines in the row direction line of the hoop material 100. That is, the hoop material 100 is fed by a pitch corresponding to the distance between adjacent hot runners in the hot runners 201-204 or 205-208.

  FIG. 5 is a diagram showing a flow of injection molding realized by the hot runner arrangement mode shown in FIG. 5 (A) to 5 (E) show the positional relationship between the hot runner arrangement mode and the hoop material 100 in chronological order, and the mode in which resin molding is performed on each resin molding scheduled portion. In FIGS. 5A to 5E, the resin molding scheduled portion where the resin molding has been executed is indicated by black painting.

  In FIG. 5 (A), thermoplastic resin is simultaneously injected from all the hot runner nozzles 221-228 of each hot runner 201-208, and on the hoop material 100 at a position corresponding to each of the hot runner nozzles 221-228. Resin molding to each resin molding scheduled part is performed.

  Next, as shown in FIG. 5B, the pitch is fed by 2 pitches from the position of the hoop material 100 shown in FIG. And the thermoplastic resin is simultaneously injected from all the hot runner nozzles 221-228 of each hot runner 201-208 at the position where the two pitches are fed, and the hoops at positions corresponding to the respective hot runner nozzles 221-228. Resin molding to each resin molding scheduled part on the material 100 is executed.

  Next, similarly, as shown in FIG. 5 (C), the sheet is fed by 2 pitches from the position of the hoop material 100 shown in FIG. 5 (B). And the thermoplastic resin is simultaneously injected from all the hot runner nozzles 221-228 of each hot runner 201-208 at the position where the two pitches are fed, and the hoops at positions corresponding to the respective hot runner nozzles 221-228. Resin molding to each resin molding scheduled part on the material 100 is executed.

  Hereinafter, similarly, as shown in FIGS. 5D and 5E, the hoop material 100 is fed by two pitches, and from each of the hot runner nozzles 221-228 of each hot runner 201-208, each time. The thermoplastic resin is injected at the same time, and resin molding is performed on the respective resin molding scheduled portions on the hoop material 100 at positions corresponding to the hot runner nozzles 221-228. In this way, the hoop material 100 is further fed by two pitches, and each time, the thermoplastic resin is simultaneously injected from all the hot runner nozzles 221-228 of each hot runner 201-208, and each of the hot runner nozzles 221-228. The resin molding to each resin molding scheduled part on the hoop material 100 in the position corresponding to is performed.

  Here, referring to FIG. 5 (A) to FIG. 5 (E), first, focusing on the column direction line P on the hoop material 100 shown in FIG. 5 (A), each resin molding on the column direction line P is performed. The resin molding aspect to the plan parts 101-108 is demonstrated.

  Each resin molding scheduled portion 101-108 on the row direction line P is shifted by one line in the row direction line of the hoop material 100 in the feed direction of the hoop material 100 with respect to each hot runner 205-208. Therefore, the resin molding to each resin molding scheduled portion 101-108 is not realized until the hoop material 100 is sent to the position shown in FIG. When the hoop material 100 is sent to the position shown in FIG. 5E, first, the hot runner 204 moves to the fourth and eighth resin molding scheduled portions 104 and 108 from the top among the resin molding scheduled portions 101-108. The resin molding is executed. Next, when the hoop material 100 is fed by two pitches from the position shown in FIG. 5E (not shown), the hot runner 203 causes the third and seventh resins from the top among the respective resin molding scheduled portions 101 to 108. Resin molding to the molding planned portions 103 and 107 is executed. Next, when the hoop material 100 is fed by 2 pitches (not shown), the hot runner 202 applies resin to the second and sixth resin molding scheduled portions 102 and 106 from the top among the resin molding scheduled portions 101 to 108. Molding is performed. Next, when the hoop material 100 is fed by two pitches (not shown), the hot runner 201 applies resin to the first and fifth resin molding scheduled portions 101 and 105 from the top among the resin molding scheduled portions 101 to 108. Molding is performed.

  In this way, resin molding to all of the resin molding scheduled portions 101-108 on the row direction line P is realized in a process in which the hoop material 100 is sequentially fed by two pitches.

  Next, referring to FIG. 5A to FIG. 5E, first, focusing on the column direction line Q on the hoop material 100 shown in FIG. The resin molding aspect to the part 101-108 is demonstrated.

  At the position shown in FIG. 5A, first, the hot runner 208 performs resin molding on the fourth and eighth resin molding scheduled portions 104 and 108 from the top among the resin molding scheduled portions 101-108. . Next, when the hoop material 100 is fed two pitches from the position shown in FIG. 5A to the position shown in FIG. 5B, the hot runner 207 causes the third resin molding scheduled portion 101-108 to be third from the top. The resin molding to the seventh resin molding scheduled portions 103 and 107 is executed. Next, when the hoop material 100 is fed two pitches from the position shown in FIG. 5B to the position shown in FIG. 5C, the hot runner 206 takes the second from the top among the resin molding scheduled portions 101-108. Resin molding to the sixth resin molding scheduled portions 102 and 106 is executed. Next, when the hoop material 100 is fed two pitches from the position shown in FIG. 5C to the position shown in FIG. 5D, the hot runner 205 takes the first one from the top among the resin molding scheduled portions 101-108. Resin molding to the fifth resin molding scheduled portions 101 and 105 is executed. Thereafter, the hoop material 100 is further fed by two pitches, and the hoop material 100 passes below the hot runner 201-204. During this time, the respective resin molding scheduled portions 101-108 on the row direction line Q are used. No resin molding is performed. This is because each resin molding scheduled portion 101-108 on the row direction line Q is shifted by one line of the row direction line of the hoop material 100 in the feed direction of the hoop material 100 with respect to each hot runner 201-204. This is because.

  In this way, resin molding to all of the resin molding scheduled portions 101-108 on the row direction line Q is realized in the process in which the hoop material 100 is sequentially fed by two pitches.

  For all of the resin molding scheduled portions 101-108 on each column direction line on the downstream side (right side in the drawing) from the column direction line P, a hoop is formed in the same manner as any of the column direction lines P and Q. Resin molding is realized in the process in which the material 100 is sequentially fed by two pitches.

  It should be noted that some of the column direction lines on the head side (left side in the drawing) from the column direction line P have a resin molding scheduled portion where the resin molding is not performed at the stage of passing through the hot runner 201. Such a part may be used only after the resin molding is scheduled for resin molding, or may be used after the resin molding is performed on the resin molding scheduled part by other methods, or may be discarded. Good. When discarding a line in the column direction having a resin molding scheduled portion that has not been subjected to resin molding at the stage of passing through the hot runner 201, it has a resin molding scheduled portion that has not been subjected to resin molding at the stage of passing through the hot runner 201. For the line in the row direction, the thermoplastic resin material may be saved by not performing the resin molding from the beginning. Further, when the entire portion on the head side with respect to the column direction line P is discarded, the thermoplastic resin material may be saved by not performing resin molding on the portion from the beginning. In other words, the resin molding may be performed only on each column direction line downstream from the column direction line P.

  By the way, when pitching the hoop material (lead frame) and performing resin molding on a plurality of resin molding scheduled portions set on the hoop material, the hoop material is set on a line perpendicular to the hoop feed direction on the hoop material. It is efficient to provide the same number of runner nozzles as the number of resin molding scheduled portions in the row direction of the resin molding die at the same pitch.

  However, due to the increase in the density of a plurality of resin molding scheduled portions set on the hoop material, that is, the number of the resin molding planned portions set on the line perpendicular to the hoop feed direction on the hoop material due to the molded parts, etc. It has become difficult to provide a number of runner nozzles in a direction perpendicular to the hoop feed direction. That is, when the interval between the resin molding scheduled portions adjacent to each other in the direction perpendicular to the hoop feed direction in the hoop material is reduced, it is necessary to reduce the interval between the runner nozzles adjacent in the direction perpendicular to the hoop feed direction accordingly. However, such a configuration may be difficult due to physical structure limitations of the runner nozzle and its associated parts.

  On the other hand, according to the present embodiment described above, the following excellent effects can be obtained.

  As described above, the number of hot runner nozzles corresponding to the number (8 in this example) of the resin molding scheduled portions 101-108 along the row direction line on the hoop material 100 cannot be arranged in one row. Even in this case, the same number of hot runner nozzles can be realized in cooperation with the hot runners 201-204 or 205-208 arranged offset in the hoop feed direction and the direction perpendicular to the hoop feed direction (row direction). In addition, since the hoop material 100 is also controlled to send only a predetermined pitch (2 pitches in this example), for example, compared to a configuration (configuration disclosed in Patent Document 1) in which the pitch of the hoop material 100 is periodically changed. Thus, the control content can be simplified.

  Further, even when the width of the hot runner (the length in the hoop feed direction) cannot be made smaller than the interval between adjacent resin molding scheduled portions in the hoop material 100 in the hoop feed direction, as shown in FIGS. By arranging the hot runners 201-204 in such a manner, each resin molding schedule on each row direction line after a predetermined number of rows in the hoop material 100 (in this example, after the fifteenth row direction line P from the top) is arranged. Resin molding can be realized for all of the portions 101-108. In the case where the width of the hot runner (that is, the interval between adjacent hot runners in the hoop feed direction) can be equal to or less than the interval between adjacent resin molding scheduled portions in the hoop material 100 in the hoop feed direction. The hot runners 201 to 204 may be arranged so as to be packed in a hoop feed direction (without leaving a row). In this case, the hot runners 205-208 can be dispensed with by changing the configuration in which the hoop material 100 is sequentially fed one pitch at a time. Alternatively, the hot runner 205 is disposed between the hot runners 201 and 202 in the hoop feed direction, the hot runner 206 is disposed between the hot runners 202 and 203 in the hoop feed direction, and the hot runner 203 is disposed in the hoop feed direction. The hot runner 207 may be disposed between the hot runners 207, and the hot runners 208 may be disposed on the downstream side of the hot runner 205 in the hoop feed direction (without leaving a row). In this case, it is possible to maintain a configuration in which the hoop material 100 is sequentially fed by two pitches, and to maintain a high production rate.

  In addition, although the present Example mentioned above is related to the specific hot runner arrangement | positioning aspect shown in FIG.4 and FIG.5, the hot runner arrangement | positioning aspect which can acquire the effect similar to a present Example is various. .

  For example, in the specific hot runner arrangement mode shown in FIGS. 4 and 5, the order in the hot runners 201 to 204 may be arbitrarily changed in the hoop feed direction. For example, the hot runner 201 and the hot runner 204 may be interchanged in the hoop feed direction. Similarly, the order in the hot runners 205-208 may be arbitrarily changed in the hoop feed direction.

  Moreover, in the specific hot runner arrangement | positioning aspect shown to FIG.4 and FIG.5, it changes into the structure which sends the hoop material 100 one pitch at a time, and may omit the hot runners 205-208. Also in this case, the order in the hot runners 201-204 may be arbitrarily changed in the hoop feed direction. In the above example, two hot runner groups are used, but three or more hot runner groups may be used. This is suitable when the width of the hot runner (the length of the hot runner alone in the hoop feed direction) cannot be smaller than twice the interval between adjacent resin molding scheduled portions in the hoop material 100 in the hoop feed direction. It is.

In addition, the hot runner arrangement | positioning aspect which can acquire the effect similar to a present Example should just satisfy the following conditions, for example.
(1) A plurality of resin molding scheduled portions on the same row direction line of the hoop material 100 cooperate with a plurality of hot runners arranged offset in the hoop feed direction and the direction (row direction) perpendicular thereto. Resin molded.
(2) Each of the plurality of resin molding scheduled portions on the same row direction line of the hoop material 100 is resin-molded by one of the plurality of rows of hot runners, and the other row hot The runner does not guide or set the position where resin molding is possible.
(3) The above conditions (1) and (2) are satisfied when the hoop material 100 is sent regularly by a predetermined pitch.

  The above-described injection molding method according to the above-described embodiment, the resin molding die used therefor, and the molding machine including the same are suitable for manufacturing the base portion of the electronic component.

  Here, Patent Document 2 discloses a resin-sealing mold for clamping a lead frame on which a semiconductor chip is mounted and sealing a part of the lead frame with a resin. A resin-sealed mold including an eject pin for releasing a later lead frame from the mold surface is disclosed.

  By the way, when the eject pin is moved in order to release the molded product after resin sealing onto the hoop material from the mold surface, the hoop material is long in the lateral direction, which causes a problem that the hoop material bends.

  Therefore, hereinafter, a configuration of a molding machine capable of solving such a problem will be described with reference to FIG.

  FIG. 6 is a cross-sectional view (front view) showing a main configuration of a molding machine 600 according to an embodiment of the present invention. The molding machine 600 of this embodiment is embodied as a vertical injection molding machine. 6A shows a state during mold clamping / molding of the molding machine 600, and FIG. 6B shows a mold opening / product ejection / hoop feeder rising state of the molding machine 600. FIG. FIG. 7 shows a cross-sectional view of the stationary platen 620 of the molding machine 600.

  The molding machine 600 includes a movable mold 602, a hoop feeder 603, a movable platen 604, a fixed mold 606, an ejector plate 608, an E pin 610, an ejector rod 612, a fixed platen 620, and an ejector 622. , A toggle link 624, a cross head 630, and a hoop feeder lifting rod 632.

  The movable mold 602 is fixed to the movable platen 604. The movable mold 602 may be embodied as a resin mold having the specific hot runner arrangement mode shown in FIGS. 4 and 5 (or other above-described arrangement modes). However, other types of runners such as a cold runner may be installed in the movable mold 602, or a hot runner having a normal arrangement (not according to the above-described embodiment) may be installed.

  The hoop feeder 603 moves and supplies the hoop material 100 (see FIG. 3 and the like) to the movable mold 602 and the fixed mold 606. The hoop feeder 603 is controlled so that the hoop material 100 is fed, for example, by a predetermined pitch (2 pitches) after the mold opening of the molding machine 600, the product ejection, and the rise of the hoop feeder. The hoop feeder 603 is supported by a support mechanism (not shown) so as to be able to reciprocate in the mold clamping direction (vertical direction in the figure).

  The fixed mold 606 is fixed to the fixed platen 620. The fixed mold 606 is provided with an ejector plate 608 and an E pin 610 for protruding the hoop material 100 (and thus a molded product formed there). The E pin 610 is connected to the ejector plate 608. The ejector plate 608 is supported in the fixed mold 606 so as to be able to reciprocate in the mold clamping direction (vertical direction in the figure).

  A toggle link 624 is connected to the fixed platen 620. The toggle link 624 is connected to a toggle support (not shown), and the toggle support is connected to the movable platen 604 via a tie bar (not shown). The toggle link 624 is driven by a driving mechanism (for example, an electric motor) (not shown), and moves the movable platen 604 relative to the fixed platen 620 to realize mold clamping and mold opening. Note that the toggle link 624 may be of any type including a bell clamp type.

  The fixed platen 620 is formed with a hollow portion 628 that penetrates in the hoop feed direction. The hollow portion 628 may be formed as a cast hole of the fixed platen 620 or may be formed as a processed hole. The hollow portion 628 is preferably formed with a minimum size (area of the hole portion in the cross section) necessary to ensure a movable range of a crosshead 630 described later from the viewpoint of the rigidity of the fixed platen 620. .

  A cross head 630 is provided in the hollow portion 628 of the fixed platen 620. The cross head 630 is a member that extends in the hoop feed direction, and is provided so as to penetrate the hollow portion 628 of the fixed platen 620. The cross head 630 has end portions (extension portions) 631 exposed from both sides of the fixed platen 620 in the hoop feed direction. One end (lower end) of a hoop feeder lifting rod 632 is connected to the end 631 of the crosshead 630. The hoop feeder lifting rod 632 is arranged so as to extend toward the hoop feeder 603. That is, the other end (upper end) of the lifting / lowering rod 632 for the hoop feeder extends to the vicinity of the lower surface of the hoop feeder 603.

  An ejector 622 is connected to the crosshead 630. The ejector 622 functions as a drive mechanism that drives the cross head 630 in the mold opening / closing direction (vertical direction in the drawing). The ejector 622 may include, for example, a ball screw mechanism and an electric motor. In the illustrated example, the ejector 622 includes a ball screw upper end 623 (see FIG. 6B) that contacts the lower surface of the cross head 630, and the cross head 630 is pushed up by the ball screw upper end 623 to close the mold of the cross head 630. Move in the direction (upward in the figure).

  One end (lower end) of the ejector rod 612 is connected to the cross head 630 in the hollow portion 628 of the fixed platen 620. The ejector rod 612 is arranged so as to extend toward the lower surface of the ejector plate 608. That is, the other end (upper end) of the ejector rod 612 extends to the vicinity of the lower surface of the ejector plate 608. The ejector rod 612 is provided so as to penetrate the fixed platen 620 in the mold opening / closing direction. For this purpose, the fixed platen 620 is formed with an ejector rod hollow portion 629 that penetrates in the mold opening and closing direction. The ejector rod hollow portion 629 may be formed as a cast hole of the fixed platen 620 or may be formed as a processed hole. The ejector rod hollow portion 629 is formed so as to communicate with the hollow portion 628 of the fixed platen 620.

  In this embodiment, when the cross head 630 is moved in the mold closing direction by the ejector 622, the ejector rod 612 connected to the cross head 630 is moved in the mold closing direction, and at the same time, connected to the cross head 630. The hoop feeder lifting rod 632 is moved in the mold closing direction. When the ejector rod 612 is moved in the mold closing direction, the end of the ejector rod 612 comes into contact with the lower surface of the ejector plate 608. When the ejector rod 612 is further moved in the mold closing direction, the ejector plate 608 and the E pin 610 are moved. Is moved in the mold closing direction. Thereby, the protrusion of the hoop material 100 by the E pin 610 is realized. Similarly, when the hoop feeder lifting rod 632 is moved in the mold closing direction, the end of the hoop feeder lifting rod 632 comes into contact with the lower surface of the hoop feeder 603, and the hoop feeder lifting rod 632 is further moved in the mold closing direction. When moved, the hoop feeder 603 is moved (lifted up) in the mold closing direction. Thereby, the movement of the hoop material 100 supported by the hoop feeder 603 in the mold closing direction is realized.

  Here, preferably, the timing at which the end of the ejector rod 612 abuts on the lower surface of the ejector plate 608 and the timing at which the end of the hoop feeder lifting rod 632 abuts on the lower surface of the hoop feeder 603 are the same. Adjusted to That is, the amount of protrusion of the hoop material 100 through the ejector rod 612 in the mold closing direction and the amount of movement of the hoop material 100 through the hoop feeder lifting rod 632 in the mold closing direction are adjusted to be the same. Is done.

  Thus, in this embodiment, the protrusion of the hoop material 100 via the ejector rod 612 and the movement of the hoop material 100 in the mold closing direction via the hoop feeder lifting rod 632 are mechanically linked. Realized at the same time.

  In the assembly method related to the cross head 630, the cross head 630 is inserted into the hollow portion 628 of the fixed platen 620 and then the cross head 630 is fastened to the ejector rod 612 with a nut. At this time, fastening with a socket wrench and a nut fastening jig may be realized using the ejector rod hollow portion 629.

  As described above, according to the molding machine 600 of this embodiment described above, the following excellent effects can be obtained.

  As described above, in this embodiment, as described above, the protrusion of the hoop material 100 via the ejector rod 612 and the movement of the hoop material 100 in the mold closing direction via the hoop feeder lifting rod 632 are the same drive. Therefore, these operations can be surely synchronized. Thereby, the bending of the hoop material 100 at the time of the protrusion of the hoop material 100 can be prevented appropriately.

  The crosshead 630 extends through the hollow portion 628 of the fixed platen 620 and realizes a lift-up function of the hoop feeder 603 on both sides of the fixed platen 620. As described above, according to the present embodiment, the space for extending the cross head 630 is secured by opening the hollow portion 628 in the shape of a side hole in the fixed platen 620 so that the cross head 630 extends in the extending direction. The crosshead 630 can be extended without being restricted by the link member of the toggle link 624. Further, since the hollow portion 628 is formed so that the elements of the fixed platen 620 remain on the punch surface and the anti-punch surface continuously (in a connected state), the rigidity of the fixed platen 620 is reduced due to the hollow portion 628. Can be minimized. In particular, as shown in FIG. 7, by forming the hollow portion 628 so as to be positioned above the toggle link 624, it is possible to further suppress a decrease in rigidity. This is because when the mold clamping force is applied, the upper portion of the toggle link 624 in the fixed platen 620 is a portion where the dent amount of the punch surface is smaller (rather than a convex portion) compared to both sides.

  FIG. 8 is a cross-sectional view (front view) showing a main configuration of a molding machine 800 according to another embodiment of the present invention. The molding machine 800 of the present embodiment is embodied as a horizontal injection molding machine. 8A shows a state during mold clamping and molding of the molding machine 800, and FIG. 8B shows a mold opening / product ejection / hoop feeder ejection state of the molding machine 800. FIG.

  The molding machine 800 includes a fixed mold 802, a hoop feeder 803, a fixed platen 804, a movable mold 806, an ejector plate 808, an E pin 810, an ejector rod 812, a movable platen 820, and an ejector 822. , A toggle link 824, a crosshead 830, and a hoop feeder protruding rod 832.

  Similarly, a hollow portion 828 that penetrates in the hoop feed direction is formed in the movable platen 820. The hollow portion 828 may be formed as a cast hole of the movable platen 820 or may be formed as a processed hole. The hollow portion 828 is formed with a minimum size (area of a hole portion in a cross section) necessary for ensuring a movable range of a crosshead 830 described later.

  A cross head 830 is provided in the hollow portion 828 of the movable platen 820. The cross head 830 is a member that extends in the hoop feed direction, and is provided so as to penetrate the hollow portion 828 of the movable platen 820. The cross head 830 has end portions 831 exposed from both sides of the movable platen 820 in the hoop feed direction. One end (left end) of the hoop feeder protruding rod 832 is connected to the end 831 of the crosshead 830. The hoop feeder protruding rod 832 is disposed so as to extend toward the hoop feeder 803. That is, the other end (right end) of the hoop feeder protruding rod 832 extends to the vicinity of the left surface of the hoop feeder 803.

  An ejector 822 is connected to the crosshead 830. The ejector 822 functions as a drive mechanism that drives the cross head 830 in the mold opening / closing direction (left-right direction in the drawing). The ejector 822 may include, for example, a ball screw mechanism and an electric motor. In the illustrated example, the ejector 822 includes a ball screw right end 823 (see FIG. 8B) that contacts the left surface of the cross head 830, and the cross head 830 is projected by the ball screw right end 823 to close the mold of the cross head 830. Move in the direction (right direction in the figure).

  One end (left end) of an ejector rod 812 is connected to the cross head 830 in the hollow portion 828 of the movable platen 820. The ejector rod 812 is disposed so as to extend toward the left surface of the ejector plate 808. That is, the other end (right end) of the ejector rod 812 extends to the vicinity of the left surface of the ejector plate 808. The ejector rod 812 is provided so as to penetrate the movable platen 820 in the mold opening / closing direction. For this purpose, the movable platen 820 is formed with an ejector rod hollow portion 829 that penetrates in the mold opening and closing direction. The ejector rod hollow portion 829 may be formed as a cast hole of the movable platen 820 or may be formed as a processed hole. The ejector rod hollow portion 829 is formed to communicate with the hollow portion 828 of the movable platen 820.

  According to the molding machine 800 of the present embodiment described above, as with the molding machine 600 described above, the hollow portion 828 is provided in the movable platen 820 to secure a space for extending the cross head 830, thereby The crosshead 830 can be extended without being restricted by the link member. Further, since the hollow portion 828 is formed so that the elements of the movable platen 820 remain continuously on the punch surface and the anti-punch surface, a decrease in rigidity can be minimized. In particular, by forming the hollow portion 828 so as to be located in a portion adjacent to the toggle link 824 in the mold opening / closing direction, it is possible to further suppress a decrease in rigidity (see FIG. 7).

  FIG. 9 is a cross-sectional view (top view) showing a main configuration of a molding machine 900 according to still another embodiment of the present invention. The molding machine 900 of the present embodiment is embodied as a horizontal injection molding machine. 9A shows a state during mold clamping / molding of the molding machine 900, and FIG. 9B shows a state of mold opening / product ejection / hoop feeder ejection of the molding machine 900. FIG.

  The molding machine 900 of the present embodiment is different from the molding machine 800 shown in FIG. 8 in that the hoop feed direction is the horizontal direction, and the hoop feed direction is the vertical direction. Since the other points are substantially the same as those of the molding machine 800 shown in FIG. 8, the same reference numerals are assigned and the description thereof is omitted. When the hoop feed direction is the lateral direction, the link member of the toggle link 824 is provided across the direction intersecting the extending direction of the crosshead 830 as shown in FIG. There are no major restrictions on extension. However, in the case of the molding machine 900 of the present embodiment, similarly, the hollow portion 828 is formed so that the elements of the movable platen 820 remain continuously on the punch surface and the anti-punch surface, so that the decrease in rigidity is minimized. To the limit.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, the cross head is penetrated from the movable platen and the hoop material is protruded from the outside of the mold. However, the present invention is not limited to this, for example, the anti-punch surface side of the movable platen. The crosshead may be extended using space, or the crosshead may be extended by forming a groove on the anti-punch surface. However, in these cases, when the toggle mechanism is employed, the extension direction of the crosshead is limited. Therefore, as in the above-described embodiment, the movable platen is provided with a hollow portion to extend the crosshead. This is preferable from the viewpoint of design freedom.

DESCRIPTION OF SYMBOLS 10 Hot runner 12 Hot runner nozzle 20 Hot runner 22 Hot runner nozzle 100 Hoop material 101-108 Resin molding scheduled part 201-208 Hot runner 221-228 Hot runner nozzle 600,800,900 Molding machine 602 Fixed mold 603 Hoop feeder 604 Movable platen 606 Movable mold 608 Ejector plate 610 E pin 612 Ejector rod 620 Fixed platen 622 Ejector 623 Upper end of ball screw 624 Toggle link 628 Hollow portion 629 Ejector rod hollow portion 630 Cross head 631 Cross head end portion 632 Hoop feeder Rod 802 Fixed mold 803 Hoop feeder 804 Fixed platen 806 Movable mold 808 Ejector plate 810 E pin 81 Ejector rod 820 movable platen 822 Ejector 823 ball screw upper portion 824 toggle link 828 hollow portion 829 hollow portion 830 crosshead 831 projecting rod for an end portion 832 hoop feeder crosshead ejector rod

Claims (1)

An injection molding machine comprising a resin mold and an ejector mechanism,
Protruding means for projecting a hoop material in the mold closing direction outside the mold, the projecting means operating in synchronization with the ejector operation of the ejector mechanism by extending a crosshead of the ejector mechanism, and the ejector The mechanism is provided on a fixed platen or a movable platen, a hollow portion penetrating in the hoop feed direction is formed in the fixed platen or the movable platen, and a cross head of the ejector mechanism is extended so as to penetrate the hollow portion. Features an injection molding machine.

Images