TWI616304B - Injection molding machine - Google Patents

Abstract

An object of the present invention is to provide a resin molding mold, an injection molding machine, and an injection molding method which can effectively perform resin molding on a hoop material by using a hot runner. The resin molding die of the present invention is provided with a first row of hot runners and a second row of hot runners in a direction perpendicular to the feeding direction of the hoop material, and is characterized in that the hot runner nozzles of the first row of hot runners are connected to the ring. The hoop material feed direction is offset relative to the hot runner nozzles of the second row of hot runners.

Description

Injection molding machine

This application claims priority based on Japanese Patent Application No. 2010-091660 filed on April 12, 2010. The entire contents of its application are incorporated herein by reference.

The invention relates to a resin molding mold, an injection molding machine and an injection molding method.

Conventionally, an injection molding method is known, which is characterized in that when the runner portion of a resin molding mold is heated and the resin portion disposed on the lead frame is held while the thermoplastic resin is kept in a flowing state, the injection molding method may be performed at an arbitrary speed. The number of N pitches coincides with one cycle, and any number of n gates and cavities arranged at equal intervals are provided at the resin molding scheduled part of the lead frame. During the first injection molding to the Nth injection molding, N- One pitch feed is performed, and then the feed is repeated with N × (n-1) +1 pitch as one cycle (for example, refer to Patent Document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 2007-253350

However, when the hoop material (lead frame) is fed with a pitch, resin molding is performed on a plurality of resin molding scheduled portions set on the hoop material. At this time, the effective method is as follows: set the same number of flows in the direction of the resin molding die as the same pitch as the number of resin molding scheduled parts set on the hoop material on the operation line perpendicular to the hoop feed direction. Road nozzle.

However, with the increase in the density of the plurality of resin molding scheduled parts set on the hoop material, that is, molding components, it is difficult to provide the hoop material perpendicular to the hoop material in a direction perpendicular to the hoop material feed direction. The number of runner nozzles with the same number of resin molding scheduled parts set on the operation line of the hoop feed direction. That is, if the interval between the resin molding scheduled parts adjacent to the hoop material in a direction perpendicular to the hoop feed direction becomes smaller, it is necessary to reduce the distance between the hoop material and the abutment in a direction perpendicular to the hoop feed direction The interval between the runner nozzles, but such a structure is sometimes difficult to realize from the consideration of the physical structure of the runner nozzle and the location of the runner nozzle.

Therefore, an object of the present invention is to provide a resin molding die, an injection molding machine, and an injection molding method capable of efficiently performing resin molding on a hoop material using a hot runner.

In order to achieve the above object, according to an aspect of the present invention, a resin molding mold is provided. The resin molding mold is provided with a first row of hot runners and a second row of hot runners in a direction perpendicular to the feeding direction of the hoop material. It is characterized in that the hot runner nozzles of the hot runner in the first row are offset relative to the hot runner nozzles of the hot runner in the second row in a direction perpendicular to the feeding direction of the hoop material.

According to another aspect of the present invention, there is provided an injection molding method using a resin molding die, and the foregoing resin molding die is attached to the opposite hoop material. In the direction perpendicular to the feeding direction, there are hot runners in the first row and hot runners in the second row. The hot runner nozzle offset is characterized in that it includes a first injection molding step for the first resin from the hot runner nozzle of the first row of hot runners to the first resin in the hoop material on the operation line perpendicular to the hoop material feed direction. The molding scheduled part is injected with thermoplastic resin; the feeding step is performed after the first injection molding step, and the distance equal to the distance between the first row of hot runners and the second row of hot runners in the feeding direction of the hoop material. Feeding the hoop material; and a second injection molding step, after the aforementioned feeding step, injecting a thermoplastic resin from a hot runner nozzle of the second row of hot runners to the second resin molding scheduled portion of the aforementioned operation line in the hoop material. .

According to the present invention, a resin molding die, an injection molding machine, and an injection molding method capable of efficiently performing resin molding on a hoop material using a hot runner are obtained.

10‧‧‧ hot runner

12‧‧‧Hot runner nozzle

20‧‧‧ hot runner

22‧‧‧Hot runner nozzle

100‧‧‧Hoop material

101-108‧‧‧Resin molding scheduled department

201-208‧‧‧ hot runner

221-228‧‧‧Hot runner nozzle

600, 800, 900‧‧‧forming machines

602‧‧‧ fixed mold

603‧‧‧Hoop feeder

604‧‧‧ movable platen

606‧‧‧Motion

608‧‧‧Top plate

Pin 610‧‧‧E

612‧‧‧Ejection

620‧‧‧Fixed plate

622‧‧‧ ejector

623‧‧‧The upper end of the ball screw

624‧‧‧ toggle lever

628‧‧‧Hollow

629‧‧‧ Hollow for ejector

630‧‧‧ Cross Head

631‧‧‧ Cross head end

632‧‧‧ Lifter for hoop feeder

802‧‧‧ fixed mold

803‧‧‧Hoop feeder

804‧‧‧Fixed plate

806‧‧‧Motion

808‧‧‧Top plate

810‧‧‧E

812‧‧‧Ejection

820‧‧‧movable pressure plate

822‧‧‧Ejector

823‧‧‧The upper end of the ball screw

824‧‧‧Elbow lever

828‧‧‧Hollow

829‧‧‧ Hollow for ejector

830‧‧‧ Crosshead

831‧‧‧ Cross head end

832‧‧‧ Push rod for hoop feeder

Figures 1 (A) and (B) are diagrams showing a single product structure of the hot runner 10 that can be used in the resin molding die according to the present invention.

Figures 2 (A) and (B) are diagrams showing a single product structure of the hot runner 20 that can be used in the resin molding die according to the present invention.

FIG. 3 is a plan view showing an example of the hoop material 100 that can be used in the resin molding die according to the present invention.

FIG. 4 is a plan view showing an example of an arrangement pattern of the hot runners in the resin molding die according to the present invention in relation to the hoop material 100.

Figs. 5 (A) to (E) are diagrams showing an injection molding process realized by the hot runner arrangement pattern shown in Fig. 4.

6 (A) and (B) are cross-sectional views showing a main structure of a molding machine 600 according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a main section of the fixed platen 620 of the molding machine 600.

8 (A) and 8 (B) are sectional views showing a main structure of a molding machine 800 according to another embodiment of the present invention.

9 (A) and 9 (B) are cross-sectional views showing a main structure of a molding machine 900 according to still another embodiment of the present invention.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a single product structure of the hot runner 10 that can be used in a resin molding die 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, and Fig. 1 (B) shows an axis including the hot runner nozzle 12. Side view. When the hot runners 10 are arranged in a plurality of rows, the interval L between the hot runner nozzles 12 of the adjacent hot runners 10 is L = l1 + l2.

FIG. 2 is a diagram showing a single product structure of another hot runner 20 that can be used in a resin molding mold according to the present invention. FIG. 2 shows a two-line hot runner 20 having two hot runner nozzles 22, and FIG. 2 (A) shows A top view of the hot runner nozzle 22 viewed in the axial direction, and FIG. 2 (B) shows a side view including the hot runner nozzle 22 in the axial direction. When this hot runner 20 is used, the interval L between adjacent hot runner nozzles 22 is defined as shown in the figure.

In addition, the structure of the hot-runner to which the present invention is applied is not limited to the structure shown in FIG. 1 or FIG. 2, and a hot-runner of 3 or more strings may be used. In addition, for example, the hot runners 20 shown in FIG. 2 may be arranged in a plurality of rows, and four or more hot runner nozzles may be arranged in one row. In addition, in order to prevent the description from being complicated, a case where the hot runner 20 shown in FIG. 2 is used is described as a representative.

FIG. 3 is a plan view showing an example of the hoop material 100 that can 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 a vertical direction. The hoop material 100 is typically made of a metal material.

The hoop material 100 regularly sets a predetermined resin molding portion in a checkerboard pattern along the hoop feeding direction operation line and the column direction operation line corresponding to the feeding direction of the hoop material 100. In the example shown in FIG. 3, eight resin molding scheduled portions 101-108 are provided on the column-direction working line.

In addition, the structure of the hoop material that can be used in the resin molding mold according to the present invention is not limited to the structure shown in FIG. The structure of two or more predetermined resin molding parts may be an arbitrary structure.

Here, the interval between the planned resin molding portions along the working line in the direction of the hoop material 100 is set to 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, and the resin molding preliminary portion. The interval and the like between the fixed portions 103 and 104 are set to be the same as Lf. The interval Lf between the predetermined resin molding portions is generally smaller than the interval L between the hot runner nozzles 22 described above. This is due to the progress in miniaturization of the resin molding planned portion. In addition, it is due to the fact that it is advantageous to set as many resin molding planned portions as possible on one hoop material 100 from the viewpoint of increasing the throughput. On the contrary, due to the structural limitation of the hot runner nozzle 22 (especially, Restriction on the relationship of the heaters) is limited in reducing the interval L between the hot runner nozzles 22.

Here, as an example, the interval L between the hot runner nozzles 22 is set to four times the interval Lf between the planned resin molding portions. That is, L = 4Lf. In addition, when two or more hot runner nozzles are arranged in one row (the row along the working direction of the row direction), the interval L between the hot runner nozzles is preferably two or three times the interval Lf between the resin molding scheduled portions. Multiples.

FIG. 4 is a plan view showing an example of an arrangement pattern of the hot runners in the resin molding die 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 a vertical direction.

In Fig. 4, eight hot runners 20 shown in Fig. 2 are provided. Here, the eight hot runners are respectively indicated by the symbols 201-208 in the feeding direction of the hoop material 100 from the front row. The hot runner nozzles of each hot runner 201-208 are indicated by 221-228, respectively.

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

The hot runners 201-204 (the first hot runner group) are arranged on the operation line of every other hoop material 100 row direction in the feeding direction of the hoop material 100. also That is, the hot runners 201-204 are arranged apart from each other in the feeding direction of the hoop material 100 by an amount corresponding to two working lines of the hoop material 100 in the column direction. In addition, the hot runners 201-204 are offset from each other in a direction perpendicular to the feeding direction of the hoop material 100 (that is, the column direction) by one working line of the hoop feeding direction operation line of the hoop material 100 ( = Lf). That is, the hot runner 204 is offset relative to the hot runner 203 in a direction perpendicular to the feeding direction of the hoop material 100 by an amount corresponding to one working line of the hoop feeding direction working line (to the figure) Down direction), the hot runner 203 is similarly offset from the hot runner 202 by an amount corresponding to one working line of the hoop feed direction operating line, and the hot runner 202 is also offset from the hot runner 201 by the same amount. The hoop feed direction working line is arranged in an amount corresponding to one working line.

Similarly, the hot runners 205-208 (the second hot runner group) are arranged on the operation line of every other row of the hoop material 100 in the feeding direction of the hoop material 100. That is, the hot runners 205-208 are arranged apart from each other in the feeding direction of the hoop material 100 by an amount corresponding to two working lines of the hoop material 100 in the column direction. Also, the hot runners 205-208 are offset from each other in a direction perpendicular to the feeding direction of the hoop material 100 (that is, the row direction), corresponding to one working line of the hoop feeding direction operation line of the hoop material 100. The amount is configured. That is, the hot runner 208 is offset relative to the hot runner 207 in a direction perpendicular to the feeding direction of the hoop material 100 by an amount corresponding to one working line of the hoop feeding direction operation line (to the figure) Down direction), the hot runner 207 is similarly offset from the hot runner 206 by an amount corresponding to one working line of the hoop feed direction operating line, and the hot runner 206 is also offset from the hot runner 205 by the same amount. The hoop feed direction working line is arranged in an amount corresponding to one working line.

The hot runner 204 is arranged in the feeding direction of the hoop material 100 with respect to the hot runner 205 by an amount corresponding to three working lines of the hoop material 100 in the direction of operation. The hot runner 201 and the hot runner 205 are not offset in a direction perpendicular to the feeding direction of the hoop material 100, and the hot runner 202 and the hot runner 206 are not biased in a direction perpendicular to the feeding direction of the hoop material 100 The hot runner 203 and the hot runner 207 are not shifted in a direction perpendicular to the feeding direction of the hoop material 100, and the hot runner 204 and the hot runner 208 are not moved in a direction perpendicular to the feeding direction of the hoop material 100. Offset. More specifically, the hot runner 201 is provided with two hot runner nozzles 221 aligned with the hoop material 100 at positions corresponding to the first and fifth hoop feed direction operation lines from above in the figure. In addition, the hot runner 205 includes two hot runner nozzles 225 that are aligned with the hoop material 100 at positions corresponding to the first and fifth hoop feed direction operation lines from above in the figure. Similarly, the hot runner 202 is provided with two hot runner nozzles 222 aligned with the hoop material 100 on the second and sixth hoop feed direction operation lines from the top in the figure. In addition, the hot runner 206 includes two hot runner nozzles 226 aligned with the hoop material 100 on the second and sixth hoop feed direction operation lines from the top in the figure. Similarly, the hot runner 203 includes two hot runner nozzles 223 that are aligned with the hoop material 100 at the 3rd and 7th hoop feed direction operation lines from above in the figure. In addition, the hot runner 207 includes two hot runner nozzles 227 aligned with the hoop material 100 at positions corresponding to the 3rd and 7th hoop feed direction operation lines from above in the figure. Similarly, the hot runner 204 is provided with two hot runner nozzles 224 aligned with the hoop material 100 at the 4th and 8th hoop feed direction operation lines from the top in the figure. In addition, the hot runner 208 includes two hot runner nozzles 228 aligned with the hoop material 100 at positions corresponding to the fourth and eighth hoop feed direction operation lines from above in the figure.

In the example shown in Figure 4, two pitches are used to indicate P in the figure. The hoop material 100 is fed in the feeding direction. Here, the 1 pitch corresponds to the interval between the adjacent resin molding scheduled parts in the hoop material 100 in the feeding direction of the hoop material 100, and corresponds to the two working lines of the hoop material 100 in the direction of the line. the amount. That is, the hoop material 100 is fed at a pitch corresponding to the distance between each adjacent hot runner in the hot runners 201-204 or 205-208.

FIG. 5 is a diagram showing an injection molding process realized by the hot runner arrangement shown in FIG. 4. 5 (A) to 5 (E) show the positional relationship between the hot runner arrangement pattern and the hoop material 100 in a time series order, and show a state in which resin molding is performed to each resin molding scheduled portion. In FIGS. 5 (A) to 5 (E), the resin molding planned portion on which resin molding has been performed is indicated by blackening.

In FIG. 5 (A), thermoplastic resin is simultaneously injected from all the hot runner nozzles 221-228 of each hot runner 201-208, and each of the hoop materials 100 at positions corresponding to the hot runner nozzles 221-228 is injected. The resin molding scheduled part performs resin molding.

Next, as shown in FIG. 5 (B), two pitches are fed from the position of the hoop material 100 shown in FIG. 5 (A). Furthermore, at the positions where the two pitches are fed, thermoplastic resin is simultaneously injected from all the hot runner nozzles 221-228 of each hot runner 201-208, and the hoop material at positions corresponding to the hot runner nozzles 221-228, respectively. Resin molding is performed by each of the resin molding scheduled portions on 100.

Next, similarly, as shown in FIG. 5 (C), two pitches are fed from the position of the hoop material 100 shown in FIG. 5 (B). Furthermore, at the positions where the two pitches are fed, thermoplastic resin is simultaneously injected from all of the hot runner nozzles 221-228 of each hot runner 201-208, and the corresponding positions are corresponding to the hot runner nozzles 221-228, respectively. Resin molding is performed at each resin molding predetermined portion on the hoop material 100 at the position of the resin.

Hereinafter, similarly, as shown in FIG. 5 (D) and FIG. 5 (E), the hoop material 100 is fed with two pitches, and all the hot runner nozzles 221-228 of each hot runner 201-208 are fed at a time. At the same time, the thermoplastic resin is injected, and resin molding is performed on each resin molding predetermined portion on the hoop material 100 at positions corresponding to the hot runner nozzles 221-228, respectively. In this way, the hoop material 100 is further fed with 2 pitches, and thermoplastic resin is simultaneously injected from all the hot runner nozzles 221-228 of each hot runner 201-208 at a time corresponding to the hot runner nozzles 221-228, respectively. Resin molding is performed by each resin molding predetermined portion on the hoop material 100.

Here, referring to FIGS. 5 (A) to 5 (E), first of all, focus on the column-direction working line P on the hoop material 100 shown in FIG. 5 (A), and oppose the column-direction working line P. The resin molding modes of each of the resin molding scheduled sections 101-108 will be described.

Each of the resin molding scheduled portions 101-108 on the row-direction working line P is shifted in the feeding direction of the hoop material 100 with respect to each of the hot runners 205-208, corresponding to one operation line of the hoop material 100-line operation line. The amount. Therefore, until the hoop material 100 is fed to the position shown in FIG. 5 (E), resin molding into the respective resin molding scheduled portions 101-108 cannot be achieved. If the hoop material 100 is fed at the position shown in FIG. 5 (E), first, the fourth and eighth resin molding planned portions 104, 108 from the top of each of the resin molding planned portions 101-108 through the hot runner 204, 108 performs resin molding. Next, if the hoop material 100 is fed by two pitches (not shown) from the position shown in FIG. 5 (E), the hot runner 203 is used to position each of the resin molding scheduled portions 101-108 from above. The 3rd and 7th resin molding scheduled parts 103 and 107 perform resin molding. Secondly, if the hoop material 100 is fed by 2 pitches (Not shown), resin molding is performed on the second and sixth resin molding scheduled portions 102 and 106 from above by using the hot runner 202 to each of the resin molding scheduled portions 101-108. Next, if the hoop material 100 is fed with two pitches (not shown), the first and fifth resin molding scheduled portions 101 and 105 are moved from above to each of the resin molding scheduled portions 101-108 through the hot runner 201. Perform resin molding.

In this way, the resin molding of all the resin molding scheduled portions 101 to 108 on the nematic working line P is performed by a process of sequentially feeding the hoop material 100 at two pitches.

Next, referring to FIGS. 5 (A) to 5 (E), first of all, focus on the column-direction working line Q on the hoop material 100 shown in FIG. 5 (A), and oppose the column-direction working line Q. The resin molding forms of each of the resin molding scheduled sections 101 to 108 will be described.

In the position shown in FIG. 5 (A), first, the resin molding is performed on the fourth and eighth resin molding scheduled portions 104 and 108 from above through the hot runner 208 to each of the resin molding scheduled portions 101-108. Next, when the hoop material 100 is fed with two pitches from the position shown in FIG. 5 (A) to the position shown in FIG. 5 (B), the resin molding predetermined portions 101- In 108, resin molding is performed from the 3rd and 7th resin molding planned parts 103 and 107 from above. Next, if the hoop material 100 is fed with two pitches from the position shown in FIG. 5 (B) to the position shown in FIG. 5 (C), the resin molding planned portions 101- In 108, resin molding is performed from the upper 2nd and 6th resin molding planned parts 102 and 106. Next, if the hoop material 100 is fed by two pitches from the position shown in FIG. 5 (C) to the position shown in FIG. 5 (D), the resin molding predetermined portions 101- 1st and 5th from above in 108 The resin molding scheduled sections 101 and 105 perform resin molding. Thereafter, the hoop material 100 is further fed at two pitches, and the hoop material 100 passes below the hot runners 201-204. However, during this period, the resin molding scheduled portions 101-108 on the nematic operation line Q are not performed. Resin molding. This is because each resin molding scheduled part 101-108 on the column-direction working line Q is deviated from the hot-runner 201-204 in the feeding direction of the hoop material 100 with respect to each of the hot runners 201-204. The amount corresponding to the line.

In this way, the resin molding of all the resin molding scheduled portions 101 to 108 on the nematic working line Q is realized by a process of sequentially feeding the hoop material 100 at two pitches.

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

In addition, some of the working lines in each of the column-direction working lines that are closer to the front row side (the left side in the figure) than the column-direction working line P have a resin molding scheduled portion that does not perform resin molding at the stage of passing through the hot runner 201. Such a part may be used only based on the resin molding scheduled part that has been subjected to resin molding, or may be used in addition to the resin molding scheduled part that is subjected to resin molding by other methods, or may be discarded. When the line of operation having the direction of the resin molding planned portion that has not been resin-molded during the stage of passing through the hot runner 201 is abandoned, it is also possible to start with The column direction working line does not perform resin molding, thereby saving thermoplastic resin materials. In addition, when giving up the entire part on the front row side than the work line P in the column direction, it is also possible to right Such a part is not subjected to resin molding, thereby saving a thermoplastic resin material. That is, the resin molding may be performed only on the column-direction working lines on the downstream side from the column-direction working line P.

According to this embodiment as described above, the following excellent effects are obtained in particular.

As described above, even if it is not possible to arrange the number of hot runner nozzles corresponding to the number (in this example, eight) of the resin molding scheduled portions 101-108 on the hoop material 100 in the column direction operation line in one row. At the same time, the same number of hot runner nozzles can be achieved by the coordinated action of the hot runners 201-204 or 205-208 arranged offset from the hoop feed direction and the direction perpendicular to the hoop (column direction). In addition, the hoop material 100 is also only controlled for feeding at a predetermined pitch (in this example, two pitches), so for example, it is similar to a structure that can periodically change the feed pitch of the hoop material 100 (in the patent Compared with the structure disclosed in Document 1, the control content can be simplified.

In addition, when it is not possible to make the width of the hot runner (the length of the hoop feed direction) smaller than the interval between the adjacent resin molding scheduled parts in the hoop material 100 in the hoop feed direction, it can be used as shown in Figure 4 and The hot runners 201-204 are arranged in the form shown in FIG. 5 so as to align the operation lines on the operation lines of the hoop material 100 after the predetermined number All of the resin molding scheduled portions 101-108 realize resin molding. In addition, when 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 the adjacent resin molding scheduled portions in the hoop material 100 in the hoop feed direction. It is also possible to arrange the hot runners 201-204 tightly in the hoop feed direction (not empty rows). In this case, change the hoop material 100 to 1 If the pitches are sequentially fed, the hot runners 205-208 can be eliminated. Alternatively, a hot runner 205 may be arranged between the hot runners 201 and 202 in the hoop feed direction, and a hot runner 206 may be arranged between the hot runners 202 and 203 in the hoop feed direction. A hot runner 207 is arranged between the hot runners 203 and 204, and a hot runner 208 is arranged close to the downstream side (not empty row) of the hot runner 204 in the hoop feeding direction. In this case, the structure in which the hoop material 100 is sequentially fed at two pitches can be maintained to maintain a high production speed.

In addition, although the present embodiment described above relates to specific hot runner arrangement patterns as shown in FIGS. 4 and 5, there are various hot runner arrangement patterns that can achieve the same effects as the present embodiment.

For example, in the specific arrangement of the hot runners shown in Figs. 4 and 5, the order within the hot runners 201-204 can be arbitrarily changed in the hoop feed direction. For example, the hot runner 201 and the hot runner 204 may be exchanged and arranged in the hoop feed direction. Similarly, the order in the hot runners 205-208 can also be arbitrarily changed in the hoop feed direction.

In addition, in the specific arrangement of the hot runners shown in FIGS. 4 and 5, the structure in which the hoop material 100 is sequentially fed at a pitch may be changed, and the hot runners 205 to 208 may be omitted. Alternatively, in this case, the order in the hot runners 201-204 may be arbitrarily changed in the hoop feeding direction. In the above example, two hot runner groups are used, but three or more hot runner groups may be used. This is best when the width of the hot runner (the length of the hoop feed direction of the single hot runner product) cannot be less than twice the interval between the adjacent resin molding scheduled portions in the hoop material 100 in the hoop feed direction.

In addition, a hot runner row having the same effect as that of this embodiment can be obtained. The form of the row may satisfy the following conditions, for example.

(1) A plurality of predetermined resin molding sections on the operation line of the hoop material 100 in the same row and a plurality of hot runners are arranged in an offset arrangement in the hoop feed direction and a direction perpendicular to the hoop (row direction) to perform resin. forming.

(2) A plurality of scheduled resin molding sections on the same direction of the hoop material 100 are respectively formed by resin molding through the hot runners in any one of the plurality of hot runners, and will not be guided by the hot runners in other rows. To the position where resin can be molded and set.

(3) The above conditions (1) and (2) are satisfied when the hoop material 100 is regularly fed at a predetermined pitch.

In addition, the injection molding method based on the above-described embodiment, the resin molding mold used in the method, and a molding machine provided with the mold are suitable for manufacturing a basic part of an electronic component.

Here, Japanese Patent Application Laid-Open No. 2009-148934 discloses a resin sealing mold which is used to seal a part of the lead frame with resin in addition to clamping a lead frame on which a semiconductor chip is mounted. The eject pin of the lead frame after the resin sealing is released from the mold surface.

However, when the ejector pin is moved in order to release the mold from the surface of the mold and seal the molded product on the hoop material, the hoop material is long in the lateral direction, so that deflection occurs on the hoop material. The problem.

Therefore, the structure of a molding machine capable of eliminating such problems will be described below with reference to the drawings subsequent to FIG. 6.

FIG. 6 is a cross-sectional view (front view) showing a main structure of a molding machine 600 according to an embodiment of the present invention. The molding machine 600 of this embodiment serves as The vertical injection molding machine is embodied. FIG. 6 (A) shows the state of the molding machine 600 during clamping or molding, and FIG. 6 (B) shows the state of the mold opening or product launch of the molding machine 600 or the hoop feeder rising. FIG. 7 is a cross-sectional view of the fixed 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, an ejector 622, and a toggle rod 624 , Cross head 630 and lifting rod 632 for hoop feeder.

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

The hoop feeder 603 moves the hoop material 100 (refer to FIG. 3 and the like) relative to the movable mold 602 and the fixed mold 606 and supplies the hoop material 603. The hoop feeder 603 is controlled by feeding the hoop material 100 at a predetermined pitch (2 pitches) after the mold opening of the molding machine 600 or product launch or the hoop feeder rises, for example. The hoop feeder 603 can be reciprocally supported in a mold clamping direction (upward and downward direction in the figure) by a support mechanism (not shown).

The fixed mold 606 is fixed to the fixed platen 620. The fixed mold 606 is provided with a push-out plate 608 and an E pin 610 for pushing out the hoop material 100 (and a molded product formed thereon). The E pin 610 is connected to the ejection plate 608. The ejector plate 608 is supported in the fixed mold 606 in a reciprocating direction in the mold clamping direction (upper and lower directions in the figure).

The fixed pressure plate 620 is connected to the toggle lever 624. The toggle lever 624 is connected to A toggle seat (not shown) is connected to the movable platen 604 by a connecting rod (not shown). The toggle lever 624 is driven by a driving mechanism (for example, an electric motor), which is not shown, and moves the movable platen 604 relative to the fixed platen 620 to achieve mold clamping and mold opening. In addition, the toggle lever 624 may be in any form including a form of a bell crank.

A hollow portion 628 is formed on the fixed platen 620 and penetrates in the hoop feeding direction. The hollow portion 628 may be formed as a cast hole of the fixed platen 620 or as a processed hole. From the viewpoint of the rigidity of the fixed platen 620, the hollow portion 628 is preferably formed with a minimum required size (the area of a portion of a hole in a cross section) for securing a movable range of the crosshead 630 described later.

A cross head 630 is provided in the hollow portion 628 of the fixed platen 620. The cross head 630 is a member extending in the hoop feeding direction and is provided 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 feeding direction. An end portion 631 of the cross head 630 is connected to one end (lower end) of the hoop feeder lifting rod 632. The hoop feeder lifting rod 632 is arranged to extend toward the hoop feeder 603. That is, the other end (upper end) of the hoop feeder lifting rod 632 extends to the vicinity of the lower surface of the hoop feeder 603.

An ejector 622 is connected to the cross head 630. The ejector 622 functions as a driving mechanism that drives the crosshead 630 in the mold opening and closing direction (upward and downward directions in the figure). The ejector 622 may include, for example, a ball screw mechanism and an electric motor. In the example shown in the figure, the ejector 622 has a ball screw upper end portion 623 (see FIG. 6 (B)) abutting on the lower side of the cross head 630, and the cross head 630 is pushed by the ball screw upper end portion 623. To make the crosshead 630 close the mold (Upward direction in the figure).

In the hollow portion 628 of the fixed pressure plate 620, one end (lower end) of the ejection rod 612 is connected to the cross head 630. The ejection lever 612 is arranged so as to extend toward the ejection plate 608. That is, the other end (upper end) of the ejection lever 612 extends to the vicinity of the lower surface of the ejection plate 608. The ejection lever 612 is provided to penetrate the fixed platen 620 in the mold opening and closing direction. For this purpose, a hollow portion 629 for the ejection rod may be formed on the fixed platen 620 and penetrates in the mold opening and closing direction. The hollow portion 629 for the ejector can be formed as a cast hole of the fixed platen 620 or as a machined hole. The hollow portion 629 for the ejector is formed as a hollow portion 628 communicating with the pressure plate 620.

In this embodiment, if the crosshead 630 is moved in the mold closing direction by the ejector 622, the ejection lever 612 connected to the crosshead 630 is moved in the mold closing direction, and at the same time connected to the ring of the crosshead 630 The hoop feeder lifting rod 632 moves in the mold closing direction. If the ejector lever 612 moves in the mold closing direction, the end of the ejector lever 612 abuts against the ejection plate 608. If the ejector lever 612 moves further in the mold closing direction, the ejector plate 608 and E pin 610 Move in the closed mold direction. Thereby, the hoop material 100 is pushed out by the E pin 610. Similarly, if the hoop feeder lifting rod 632 moves in the mold closing direction, the end of the hoop feeder lifting rod 632 abuts below the hoop feeder 603, and if the hoop feeder lifting rod 632 moves further toward the closed mold When moving in the direction, the hoop feeder 603 moves (raises) in the mold closing direction. Thereby, the hoop material 100 supported by the hoop feeder 603 is moved to the mold closing direction.

Here, the timing at which the end of the ejection lever 612 abuts below the ejection plate 608 and the timing at which the end of the hoop feeder lifting rod 632 abuts below the hoop feeder 603 are preferably the same. That is, adjusted to the hoop material 100 The amount pushed out by the ejector rod 612 in the mold closing direction is the same as the amount that the hoop material 100 moves in the mold closing direction via the hoop feeder lifting rod 632.

Thus, in this embodiment, the pushing out of the hoop material 100 through the ejector lever 612 and the movement of the hoop material 100 in the mold closing direction through the hoop feeder lifting rod 632 are simultaneously realized mechanically.

In addition, the assembly method of the crosshead 630 is as follows: After the crosshead 630 is inserted into the hollow portion 628 of the fixed pressure plate 620, the crosshead 630 is fastened to the ejector rod 612 with a nut. At this time, the hollow portion 629 for the ejector can be used for tightening by a socket wrench and a nut tightening jig.

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

As described above, in the present embodiment, the pushing of the hoop material 100 via the ejector lever 612 and the movement of the hoop material 100 via the hoop feeder lifting lever 632 in the mold closing direction are realized by the same drive, and therefore can be reliably obtained These actions are synchronized. Accordingly, it is possible to appropriately prevent deflection of the hoop material 100 when the hoop material 100 is pushed out.

In addition, the cross head 630 extends through the hollow portion 628 of the fixed platen 620, and realizes the lifting function of the hoop feeder 603 on both sides of the fixed platen 620. In this way, according to this embodiment, the space for extending the crosshead 630 is ensured by vacating a horizontal hole-shaped hollow portion 628 in the fixed platen 620, so that the elbow rod 624 provided throughout the extending direction of the crosshead 630 is not connected. Restriction of the lever member can extend the crosshead 630. In addition, since the hollow portion 628 is formed in such a way that the elements of the fixed platen 620 are continuous (in a connected state) on the perforated surface and the reverse side of the perforated plate, the fixed platen caused by the hollow portion 628 can be minimized Reduced rigidity of 620. In particular, as shown in FIG. 7, the hollow portion 628 is formed so as to be positioned on the upper portion of the toggle lever 624, so that it is possible to further suppress a decrease in rigidity. This is because when the clamping force is applied, the upper portion of the toggle lever 624 in the fixed platen 620 is a portion (a portion that becomes convex) having a smaller recessed amount than the two sides of the perforated surface.

FIG. 8 is a cross-sectional view (front view) showing a main structure of a molding machine 800 according to another embodiment of the present invention. The molding machine 800 of this embodiment is embodied as a horizontal injection molding machine. FIG. 8 (A) shows the state of the molding machine 800 during mold clamping or molding, and FIG. 8 (B) shows the state of the molding machine 800 when the mold is opened or the product is pushed out or the hoop feeder is pushed out.

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 lever 812, a movable platen 820, an ejector 822, and a toggle lever 824 , Cross head 830 and push-out lever 832 for hoop feeder.

Similarly, the movable platen 820 is formed with a hollow portion 828 penetrating in the hoop feeding direction. The hollow portion 828 may be formed as a cast hole of the movable platen 820 or as a processed hole. The hollow portion 828 is formed with a required minimum size (partial area of a hole in a cross section) required to secure a movable range of the cross head 830 described later.

A crosshead 830 is provided in a hollow portion 828 of the movable platen 820. The crosshead 830 is a member extending in the hoop feeding direction and is provided to penetrate the hollow portion 828 of the movable platen 820. The crosshead 830 has ends 831 exposed from both sides of the movable platen 820 in the hoop feeding direction. One end (left end) of the hoop feeder push-out lever 832 is connected to the end 831 of the cross head 830. Hoop feeding The ejector lever 832 is arranged so as to extend toward the hoop feeder 803. That is, the other end (right end) of the hoop feeder ejection lever 832 extends to the vicinity of the left side of the hoop feeder 803.

An ejector 822 is connected to the crosshead 830. The ejector 822 functions as a driving mechanism that drives the crosshead 830 in the mold opening and closing direction (the left-right direction in the figure). The ejector 822 may include, for example, a ball screw mechanism and an electric motor. In the example shown in the figure, the ejector 822 includes a right end portion 823 of a ball screw abutting on the left side of the cross head 830 (see FIG. 8 (B)), and the cross head 830 is pushed out at the right end portion 823 of the ball screw. Thereby, the cross head 830 is moved in the mold closing direction (right direction in the figure).

In the hollow portion 828 of the movable platen 820, one end (left end) of the ejector rod 812 is connected to the cross head 830. The ejection lever 812 is arranged so as to extend toward the left side of the ejection plate 808. That is, the other end (right end) of the ejector lever 812 extends to the vicinity of the left side of the ejector plate 808. The ejector lever 812 is provided so as to penetrate the movable platen 820 in the mold opening and closing direction. For this purpose, the movable platen 820 is formed with a hollow portion 829 for an ejector rod that penetrates in the mold opening and closing direction. The hollow portion 829 for the ejector can be formed as a cast hole of the movable platen 820 or as a machined hole. The ejector hollow portion 829 is formed so as to communicate with the hollow portion 828 of the movable platen 820.

According to the molding machine 800 of the present embodiment described above, similar to the molding machine 600 described above, the hollow portion 828 is vacated in the movable platen 820 to ensure the space for the extension of the crosshead 830, and thus is not affected by the link member of the toggle lever 824 The restriction can extend the crosshead 830. In addition, since the hollow portion 828 is formed in such a manner that the elements of the movable platen 820 are continuous on the perforated surface and the reversed perforated surface, it can be minimized. Limit the reduction of rigidity to the limit. In particular, the hollow portion 828 can be formed so as to be located in a portion adjacent to the toggle lever 824 in the mold opening and closing direction, thereby further suppressing a decrease in rigidity (see FIG. 7).

Fig. 9 is a sectional view (bottom view) showing a main structure of a molding machine 900 according to still another embodiment of the present invention. The molding machine 900 of this embodiment is embodied as a horizontal injection molding machine. FIG. 9 (A) shows the state of the molding machine 900 during mold clamping or molding, and FIG. 9 (B) shows the state of the mold opening or product introduction of the molding machine 900 or the hoop feeder.

The difference between the forming machine 900 of this embodiment and the forming machine 800 shown in Fig. 8 in which the hoop feed direction is longitudinal is that the hoop feed direction is transverse. In other respects, it is substantially the same as the molding machine 800 shown in FIG. In addition, when the hoop feed direction is transverse, as shown in FIG. 9, the link member of the toggle lever 824 is provided in a direction crossing the extending direction of the cross head 830, so the cross head 830 is not extended. Bring big restrictions. However, the molding machine 900 of the present embodiment is also the same. Since the hollow portion 828 is formed in such a manner that the elements of the movable platen 820 are continuous on the perforated surface and the perforated reverse surface, the reduction in rigidity can be minimized.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments, and various modifications and replacements can be added to the above embodiments as long as they do not depart from the scope of the present invention.

For example, in the above-mentioned embodiment, the crosshead is configured to penetrate through the movable platen and push out the hoop material from the outside of the mold, but the present invention is not limited to this. For example, the space on the reverse side of the perforated plate of the movable platen can be used to extend Cross head, can also be formed on the reverse side of the perforation to extend the cross head. But in this case When the elbow mechanism is adopted, since the extension direction of the crosshead is limited, it is considered from the viewpoint of design freedom. As in the above-mentioned embodiment, a structure in which a hollow portion is provided on the movable platen to extend the crosshead is suitable.

100‧‧‧Hoop material

201-208‧‧‧ hot runner

221-228‧‧‧Hot runner nozzle

P‧‧‧ Hoop feed direction

Claims (1)

An injection molding machine is provided with a resin molding die and an ejector mechanism, and is characterized in that it includes a pushing mechanism, the pushing mechanism pushes the hoop material in a mold closing direction outside the die, and extends the ejector mechanism. The crosshead moves in synchronization with the ejection action of the ejector mechanism. The ejection rod connected to the crosshead moves in the mold closing direction, and at the same time, the lifting rod for the hoop feeder connected to the crosshead moves to the closed mold. Moving in the direction, wherein the amount of pushing the hoop material through the ejector rod in the mold closing direction is adjusted to be the same as the amount of pushing the hoop material through the lifting rod for the hoop feeder in the mold closing direction. The ejector mechanism is provided on a fixed platen or a movable platen, the fixed platen or the movable platen forms a hollow portion penetrating in a hoop feeding direction, and a cross head of the ejector mechanism extends through the hollow portion.