JPH0664837U - Molding machine for synthetic resin bumpers - Google Patents

Abstract

(57) [Summary] [Structure] The molding equipment for synthetic resin bumpers is bumper 1
An injection molding die 3 having a fixed die 4 for forming the front surface side and a movable die 5 for forming the back surface side of the bumper 1 is provided. The fixed die 4 is an integral type having no mating portion, and has a convex portion 4a forming part of the bottom surface and side surface of the lamp housing concave portion 2 of the bumper 1. The movable mold 5 is slidably provided with a slide core 7 which forms the remaining portion of the side surface of the lamp housing recess 2. [Effect] Burrs generated in the mold fitting portion are generated on the side surface of the lamp housing recessed portion 2. If a side marker lamp is attached to the lamp housing recessed portion 2, the burr will be hidden, so that a burr removal operation is required. First, the burden on the operator is reduced,
It is possible to improve productivity and stabilize quality by reducing man-hours.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a synthetic resin bumper molding apparatus for molding a synthetic resin bumper having a concave undercut portion for mounting parts such as side marker lamps using a mold.

[0002]

[Prior art]

 2. Description of the Related Art In recent years, synthetic resin bumpers molded by injection molding dies are often used for automobile bumpers. For example, when attaching a side marker lamp for indicating the vehicle length to the side while driving at night to this synthetic resin bumper, as shown in FIG. 13, the side marker is placed at a predetermined position of the synthetic resin bumper 60. A lamp housing recess 61 for housing the lamp is formed. An injection mold for molding a product having an undercut portion such as the lamp housing recess 61 is disclosed, for example, in Japanese Utility Model Laid-Open No. 62-203016 in order to reliably release the molded product. As shown in the figure, a mold with a slide core slidably attached is usually used.

That is, in the case of the synthetic resin bumper 60 having the lamp housing recess 61, conventionally, as shown in FIG. 9, a fixed mold 51, a first movable mold 52, a second movable mold 53 and a third movable mold. An injection molding die 50 is used, which is divided into 54 and is provided with a slide core 55 slidably provided on the fixed die 51 for forming the surface side of the lamp housing recess.

In the injection-molding die 50 having the above structure, as shown in FIG. 10, the synthetic resin bumper 60 is formed by injecting the raw material into the cavity while the mold is clamped. After the completion of molding, as shown in FIG. 11, the slide core 55 is driven by the hydraulic cylinder 56 (see FIG. 9) to slide in the direction of arrow F in the figure. Thereafter, as shown in FIG. 12, the first movable die 52 and the second movable die 53 (third movable die 54) are moved in the die opening direction indicated by the arrow G to open the die.

Then, as shown in FIG. 15, the lamp housing recess 61 of the synthetic resin bumper 60 molded as described above is provided with side fittings such as tapping screws 62, 62 and speed nuts 63, 63, as shown in FIG. A marker lamp 64 is attached.

[0006]

[Problems to be solved by the device]

 By the way, although a burr called a parting line is generated at the joint between the divided molds, the synthetic resin bumper 60 molded by the injection molding mold 50 is shown in FIG. As described above, the parting line PL is generated around the lamp housing recess 61 which is the mating portion (the portion indicated by M in FIG. 10) between the fixed die 51 and the slide core 55.

As described above, if the parting line PL exists on the surface side of the synthetic resin bumper 60, the aesthetic appearance of the product will be impaired. Therefore, the parting line PL is usually manually operated by an operator. Will be removed and finished to the extent that it does not spoil the aesthetics. That is, conventionally, there is a problem in that the worker needs to remove the above-mentioned parting line PL in the finishing process after demolding, which imposes a heavy burden on the worker and lowers productivity. Further, since the parting line PL 2 is removed manually, there is a problem in that the quality of the synthetic resin bumper 60 varies depending on the finished state.

The present invention has been made in view of the above, and an object thereof is to eliminate the work of removing and finishing the parting line PL by an operator, thereby reducing the burden on the operator and improving the productivity. Another object of the present invention is to provide a molding device for a synthetic resin bumper, which is capable of stabilizing the quality of the synthetic resin bumper.

[0009]

Means for Solving the Problems A molding apparatus for a synthetic resin bumper according to the present invention is a molding apparatus for molding a synthetic resin bumper having a concave undercut portion for mounting parts such as side marker lamps. The following measures have been taken to solve the above problem.

That is, the above-mentioned synthetic resin bumper molding apparatus includes a first mold for forming a front surface side of the synthetic resin bumper and a second mold for forming a rear surface side of the synthetic resin bumper, The first mold is an integral type and has a convex portion for forming a part of the bottom surface and the side surface of the concave undercut portion, and the second mold has the concave undercut portion. A slide core is provided slidably for forming the remaining portion of the side surface of the cut portion.

[0011]

[Action]

 According to the above configuration, the concave undercut portion of the synthetic resin bumper has the first-type convex portion for forming the front surface side of the synthetic resin bumper and the rear surface side of the synthetic resin bumper. And a part of the bottom surface and the side surface of the concave undercut portion by the convex portion and the side surface by the slide core. The rest of the film is formed.

Since the first mold forming the surface side of the synthetic resin bumper is an integral type with no mating portion, it is called a parting line around the concave undercut portion as in the past. Burr does not occur. That is, in the synthetic resin bumper molded by the above molding device, a parting line is formed on the side surface of the concave undercut portion which is the mating portion between the first mold convex portion and the second mold slide core. It will be.

As described above, in the above-described configuration, the parting line that is always generated when the divided molds are used is generated on the side surface of the concave undercut portion, and thus the concave undercut portion is formed. If parts such as side marker lamps are attached, the parting line will be hidden by the parts. For this reason, it is possible to reduce the burden on the worker and significantly improve the productivity by reducing the number of man-hours, which does not require a special finishing such as the conventional work of removing the parting line by the worker. Furthermore, since the parting line removal work that was conventionally done manually is no longer necessary, there will be no variation in quality depending on the finished state as in the past, and the quality of the synthetic resin bumper will be stabilized. You can

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

As shown in FIG. 5, the molding apparatus for the synthetic resin bumper according to the present embodiment stores side marker lamps (parts) for indicating the vehicle length with respect to the side during night driving. The synthetic resin bumper 1 having the lamp housing concave portion (concave undercut portion) 2 is molded.

As shown in FIG. 1, the molding apparatus includes a fixed mold (first mold) 4 that forms the front surface side of the synthetic resin bumper 1 and a movable mold (first mold) that forms the back surface side of the synthetic resin bumper 1. (2 mold) 5 and two movable molds 6 and 6 which form both end portions on the front surface side of the synthetic resin bumper 1 are provided with an injection molding mold 3 divided into four. Incidentally, this figure is an enlarged view showing the mold structure in the vicinity of the lamp housing recess 2 of the synthetic resin bumper 1, and one movable mold 6 is not shown.

The fixed die 4 is an integral type having no mating portion, and the fixed die 4 is not provided with a slide core as in the conventional case. Further, the fixed die 4 has a convex portion 4a forming part of the bottom surface and side surface of the lamp housing concave portion 2.

It should be noted that, as shown in FIGS. 6 and 7, the lamp housing recess 2 of the synthetic resin bumper 1 molded by the injection molding die 3 has a bottom surface 2a for penetrating the back surface of the side marker lamp. The through hole 2b and the mounting hole 2c for mounting one end of the side marker lamp 10 are formed, and a part thereof is deeply dug, and the side surface 2d 'forming the deep dug portion is A mounting hole 2e for mounting the other end of the side marker lamp 10 is formed.

That is, the convex portion 4a of the fixed mold 4 has a bottom surface 2a which serves as a seating surface when the side marker lamp 10 is mounted, a through hole 2b, a mounting hole 2c, and a side surface 2d 'which forms the deep-dipped portion. The side surface 2d other than the line connecting the points P ', Q and R (see FIG. 6) in FIG. Also, the line connecting the points Q and R in the convex portion 4a (see FIG. 1) is set so as to have a draft angle θ of 1 to 2 ° with respect to the mold opening direction indicated by the arrow A. There is.

The movable die 5 is provided with a slide core 7 which can slide in a direction of an arrow B having a predetermined angle with the die opening direction of the movable die 5. That is, the movable die 5 is formed with a guide hole 5a for guiding the slide core 7 in the direction of the arrow B, and a slide core driving means such as a hydraulic cylinder (not shown) is fixed. The slide core 7 is fixed to the end of the output shaft 8 of the core driving means. A slide plate 9 is interposed between the guide hole 5a and the slide core 7.

In the mold clamped state, the slide core 7 comes into contact with the convex portion 4 a of the fixed mold 4 along the line connecting the points P ′, Q and R (see FIG. 1), and the lamp housing concave portion 2 The mounting hole 2e is formed on the lower side in the drawing than the line (see FIG. 6) connecting the points P ', Q and R on the side surface 2d' which forms the deep portion.

Since the portion corresponding to the line connecting the point P ′ and the point P on the slide core 7 (see FIG. 4) is formed in the sliding direction indicated by the arrow B, the point P on the lamp housing recess 2 is formed. The edge portion (see FIG. 6) corresponding to the line connecting ′ and the point P is linearly formed.

The molding apparatus includes an injection device (not shown) that injects the raw material into the mold cavity, and a mold clamping device (not shown) that tightens the injection molding die 3.

The operation of the molding apparatus having the above configuration will be described below.

First, as shown in FIG. 1, when the injection molding die 3 is clamped by the mold clamping device, the raw material is injected into the mold cavity by the injection device, so that the synthetic resin bumper 1 Will be molded.

After the completion of molding, as shown in FIG. 2, the movable mold 5 and the movable mold 6 move in the mold opening direction indicated by the arrow A to perform mold opening.

After the mold is opened, as shown in FIG. 3, the slide core 7 is driven by slide core driving means (not shown) to slide in the direction of arrow B in the figure. The synthetic resin bumper 1 of this embodiment is a flexible urethane resin bumper, and thereafter, the synthetic resin bumper 1 is removed from the movable mold 5 by an operator.

In the synthetic resin bumper 1 molded as described above, as shown in FIG. 6, points P ′ and Q, which correspond to the joint between the convex portion 4 a of the fixed mold 4 and the slide core 7, are shown. A burr called a parting line PL occurs on the line connecting the points R. As described above, in this embodiment, the parting line PL is generated on the side surface 2d of the lamp housing recess 2 and, as shown in FIG. 7, if the side marker lamp 10 is attached to the lamp housing recess 2, the parting line PL is formed. PL is almost hidden by the side marker lamp 10.

Next, the attachment of the side marker lamp 10 to the lamp housing recess 2 of the synthetic resin bumper 1 will be described.

At the end of the side marker lamp 10, there is formed a hook-shaped engaging portion 10 a that engages with a mounting hole 2 e formed in a side surface 2 d ′ that forms a deeply dug portion of the lamp housing recess 2. Is made. A leaf spring 11 is attached by a tapping screw 12 near the engaging portion 10a on the bottom surface of the side marker lamp 10.

When mounting the side marker lamp 10 in the lamp housing recess 2, first, the engaging portion 10 a and the leaf spring 11 of the side marker lamp 10 are inserted into the mounting hole 2 e of the lamp housing recess 2. Will be done. In this case, the engaging portion 10a is biased by the leaf spring 11 and pressed against the side surface of the mounting hole 2e to maintain the mounted state. That is, the side surface 2d 'forming the deeply-dipped portion of the lamp housing recess 2 serves as a seat surface. As described above, the work of attaching one end of the side marker lamp 10 can be performed quickly by simply inserting the engaging portion 10a and the leaf spring 11 into the attachment hole 2e.

Further, the other end of the side marker lamp 10 is attached to the lamp housing recess 2 by attaching, for example, a tapping screw 14 and a speed screw to the mounting hole 2c formed in the bottom surface 2a of the lamp housing recess 2 serving as a seat surface. The side marker lamp 10 is attached by using a fastening means such as a nut 15.

As described above, in the molding apparatus for the synthetic resin bumper of the present embodiment, the fixed mold 4 forming the front surface side of the synthetic resin bumper 1 is an integral type without a mating portion, and the fixed mold 4 has A convex portion 4a for forming a part of the bottom surface 2a and the side surface 2d of the lamp housing recess 2 is formed, and the movable mold 5 forming the back surface side of the synthetic resin bumper 1 has the lamp housing recess 2 described above. A slide core 7 for forming the remaining part of the injection molding die 3 is slidably provided.

As a result, in the synthetic resin bumper 1 molded by the injection molding die 3, as shown in FIG. 6, a parting line PL is generated on the side surface 2d of the lamp housing recess 2. As shown in FIG. 7, if the side marker lamp 10 is attached to the lamp housing recess 2, the parting line PL is almost hidden by the side marker lamp 10, and special finishing by the operator as in the conventional case is required. Not only that, the burden on workers can be reduced, and the productivity can be greatly improved by reducing the number of man-hours. Furthermore, since the parting line removal and finishing work that was conventionally done by hand is no longer necessary, there is no variation in quality depending on the finished state, and the quality of the synthetic resin bumper 1 is stabilized. Can be achieved.

Further, in the past, since the entire lamp housing recess was formed by the slide core, a large slide core was used. As a result, a slide core such as a hydraulic cylinder for driving the slide core was used. It also led to an increase in the size of the drive means.

On the other hand, in the present embodiment, most of the lamp housing recess 2 is formed by the convex portion 4 a of the fixed die 4, and the portion of the lamp housing recess 2 formed by the slide core 7 is more than conventional. Few. Therefore, the slide core can be made smaller than in the past, and as a result, the slide core driving means can be made smaller.

Further, conventionally, since the slide core had to be slid before the mold was opened, burrs entered the slide portion of the slide core, and after the synthetic resin bumper was released from the mold. However, it is difficult to remove the burrs remaining in the mold, and there is a problem in that burrs are liable to become defective.

On the other hand, in this embodiment, since the slide core 7 can be slid after the injection molding die 3 is opened, the slide core 7 can be moved to the movable die 5 before sliding. If the remaining burr is removed and then the slide core 7 is slid, the burr does not enter the slide part (guide hole 5a) of the slide core 7 and simplifies the work for removing the burr remaining in the mold. Therefore, it is possible to reduce the burr bite failure.

Further, in the present embodiment, the occurrence of burrs is reduced as compared with the conventional case in which burrs are generated in a wide range around the lamp housing recess. Therefore, from this point as well, the work for removing the burrs remaining in the mold is performed. Can be simplified.

The injection mold 3 is used to mold the synthetic resin bumper 1 made of a flexible urethane resin or the like. The synthetic resin bumper 1 is detached from the movable die 5 by hand. On the other hand, a mold for molding a synthetic resin bumper with poor flexibility requires special consideration for demolding the synthetic resin bumper. An example in which a mold for molding such a synthetic resin bumper having poor flexibility is applied to the present invention will be described below with reference to FIG. It should be noted that the members having the same configurations as those of the injection mold 3 shown in FIG. 1 are designated by the same member numbers as those in FIG. 1, and the description thereof will be omitted.

The injection mold 23 for molding a synthetic resin bumper having poor flexibility is composed of a fixed mold (first mold) 4 forming a front surface side of the synthetic resin bumper 1 and a rear surface side of the synthetic resin bumper 1. Two inclined movable dies (second dies) 15 and 15 forming each side portion of the synthetic resin bumper 1, a movable die 16 forming a front portion on the back surface side of the synthetic resin bumper 1, and both ends on the front surface side of the synthetic resin bumper 1. It is divided into two movable dies 6 and 6 forming a part. It should be noted that this figure is an enlarged view showing the mold structure in the vicinity of the lamp housing recess 2 of the synthetic resin bumper 1, and one of the tilt movable mold 15 and the movable mold 6 is not shown.

The main difference between the injection molding die 3 shown in FIG. 1 and the injection molding die 23 is that in the injection molding die 3 shown in FIG. In contrast to the injection molding die 23, the injection molding die 23 is configured such that the back surface side of the synthetic resin bumper 1 is formed by the three-divided molds 15, 15, 16 and the injection molding die 23. 23, the side ejector 17 is used, and in the injection molding die 23, the slide core 7'is smaller.

The side ejector 17 is provided on the tiltable mold 15 so as to be slidable in the direction of arrow C, and a pin 17a is connected to the end portion thereof. The movable die 16 is formed with a guide groove 16a that engages with a pin 17a connected to an end of the side ejector 17. The bottom surface of the guide groove 16a is formed in the vertical direction so as to guide the side ejector 17 in the vertical direction. Further, the tiltable movable die 15 is provided with a spring 18 for urging the side ejector 17 toward the movable die 16 so that the pin 17a is pressed against the bottom surface of the guide groove 16a. There is.

In the above configuration, the mold release of the synthetic resin bumper 1 from the injection mold 23 is performed as follows. First, the movable molds 6, 15 and 16 are moved in the mold opening direction indicated by arrow A to open the mold. After the mold is opened, the slide core 7'is slid in the direction of arrow B by being driven by the hydraulic cylinder 19 as the slide core driving means. Thereafter, if the movable die 16 is fixed and the movable die 6 is moved in the vertical upward direction indicated by the arrow E, the inclined movable die 15 is moved along the inclined surface of the movable die 16 in the direction indicated by the arrow D. Will be moved to. Along with this, the pin 17a connected to the side ejector 17 slides in the guide groove 16a of the movable die 16, and as the tiltable movable die 15 moves in the direction of arrow D, the side ejector is moved. 17 slides in the direction of arrow C relative to the tiltable movable die 15 to hold the synthetic resin bumper 1 in a vertically upward movement.

As described above, since the movable movable mold 6 and the synthetic resin bumper 1 move vertically upward, the inclined movable mold 15 moves obliquely upward in the direction indicated by the arrow D, so that the synthetic resin bumper 1 moves. Is released from the tilt movable mold 15. After that, the synthetic resin bumper 1 is removed from the injection mold 23 by a transporting means such as a robot arm (not shown).

The synthetic resin bumper 1 molded by the injection molding die 23 is connected with points P ′, Q and R, which are the mating portions of the convex portion 4 a of the fixed mold 4 and the slide core 7 ′. A parting line is generated at the line and the joining portion (the portion indicated by the points Q and S) between the tiltable movable die 15 and the slide core 7 '. That is, since the parting line is generated on the side surface 2d of the lamp housing recess 2 as described above, if the side marker lamp is attached to the lamp housing recess 2, the parting line is almost hidden by the side marker lamp. There is no need for special finishing by workers such as.

The above-described embodiments are intended to clarify the technical contents of the present invention, and should not be construed in a narrow sense by limiting to such specific examples. Various modifications can be made within the scope of the claims.

[0048]

[Effect of device]

 As described above, the molding apparatus for the synthetic resin bumper of the present invention molds the synthetic resin bumper having the concave undercut portion for mounting the parts, and forms the surface side of the synthetic resin bumper. And a second mold for forming the back surface side of the synthetic resin bumper. The first mold is an integral type, and the bottom surface and the side surface of the concave undercut portion are provided. And a slide core for forming the remaining portion of the side surface of the concave undercut portion is slidably provided on the second mold. is there.

Therefore, in the synthetic resin bumper molded by the molding device of the present invention, the parting line does not occur around the concave undercut portion as in the conventional case, and the parting line does not have the concave undercut part. Since it occurs on the side surface of the cut portion, if the component is attached to the concave undercut portion, the partition line is hidden by the component. Therefore, it is possible to reduce the burden on the worker and to significantly improve the productivity by reducing the man-hours, which does not require special finishing such as the removal work of the parting line by the worker as in the past. In addition, the parting line removal work that was conventionally done by hand is no longer necessary, so there is no variation in quality depending on the finished state unlike in the past, and the quality of the synthetic resin bumper is stabilized. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention and showing a main part of an injection molding die forming a vicinity of a lamp housing recess of a synthetic resin bumper.

FIG. 2 is a schematic vertical sectional view of an essential part showing a state when the mold is opened in the injection molding die.

FIG. 3 is a schematic longitudinal cross-sectional view of essential parts showing a state when a slide core is slid in the injection molding die.

FIG. 4 is an enlarged vertical sectional view showing a portion of a circle H in FIG.

FIG. 5 is a schematic perspective view showing a synthetic resin bumper molded by the injection molding die.

FIG. 6 is a partially enlarged cross-sectional perspective view showing the vicinity of a lamp housing recess of the synthetic resin bumper.

FIG. 7 is a schematic cross-sectional view of essential parts showing a state where a side marker lamp is attached to a lamp housing recess of the synthetic resin bumper.

FIG. 8 shows another embodiment of the present invention, and is a schematic vertical cross-sectional view showing a main part of an injection molding die which forms the vicinity of a lamp housing recess of a synthetic resin bumper.

FIG. 9 shows a conventional example and is a schematic vertical cross-sectional view showing an injection mold for molding a synthetic resin bumper having a lamp housing recess.

FIG. 10 is a schematic vertical cross-sectional view showing a main part of the injection molding die that forms the vicinity of the lamp housing recess.

FIG. 11 is a schematic vertical cross-sectional view of a main part showing a state when the slide core is slid in the injection molding die.

FIG. 12 is a schematic vertical cross-sectional view of essential parts showing a state when the mold is opened in the injection molding die.

FIG. 13 is a schematic perspective view showing a synthetic resin bumper molded by the injection molding die.

FIG. 14 is a partially enlarged cross-sectional perspective view showing the vicinity of a lamp housing recess of the synthetic resin bumper.

FIG. 15 is a schematic horizontal cross-sectional view of a main part showing a state where a side marker lamp is attached to a lamp housing recess of the synthetic resin bumper.

[Explanation of symbols]

 1 Synthetic Resin Bumper 2 Lamp Storage Recess (Concave Undercut) 2a Bottom 2d Side 3 Injection Mold 4 Fixed (First) 4a Convex 5 Movable (Second) 7 Slide Core 10 Side Marker Lamp (part) PL Parting line

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Claims (1)

[Scope of utility model registration request] 1. A method for molding a synthetic resin bumper having a concave undercut portion for mounting a component, comprising: a first mold for forming a front surface side of the synthetic resin bumper; A second mold for forming a back surface side, wherein the first mold is an integral type and has a convex portion for forming a part of a bottom surface and a side surface of the concave undercut portion. A molding apparatus for a synthetic resin bumper, wherein the second mold is slidably provided with a slide core for forming a remaining portion of a side surface of the concave undercut portion.