JPH08207077A - Continuous insert molding device - Google Patents

Abstract

PURPOSE: To improve precision of a pitch between inserts, improve quality of a molded body, and improve precision of a product. CONSTITUTION: A sending mechanism 12 intermittently moves an insert chain in one direction by keeping it linear. A molding machine 14 fills the inside of a cavity 3, which is formed around a resin embedding part of inserts by a pair of molds 32 to be opened/closed so as to pinch the insert chain in the direction of thickness, with a melting resin. A cut-off mechanism 15 arranged at the back stage of the molding machine cuts off the chain part from the inserts embedded in a molded body. The sending mechanism 12, the molding machine 14, and the cut-off mechanism 15 are arranged on a frame 11. A preheating section 35 is provided at a stage prior to the molding machine 14. Between the molding machine 14 and the cut-off mechanism 15, a cooling section 36 is provided. The temperature of the insert chain 3 at each mechanism is correctly controlled for responding to change of a pitch between the inserts 4 caused by thermal expansion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous insert molding apparatus for continuously performing insert molding in which inserts such as terminals are made of resin.

[0002]

2. Description of the Related Art In a state where a metal insert such as a terminal is placed in a cavity formed by a mold, a molten resin is filled in the cavity and hardened, so that the insert is cast by the resin and integrally formed. Conventionally, insert molding for molding various composite parts has been performed. This type of insert molding is used to combine the performance of different materials and to have multiple functions, as well as to consolidate parts, shorten the process, streamline assembly in the next process, stabilize the accuracy of parts, and ensure the reliability of functions. It

However, since the work of inserting the insert into the cavity is involved, there is a problem of increasing the cost of the molded product due to the extension of the molding cycle.
Therefore, it is desired to develop an insert molding device that effectively solves such problems.

On the other hand, in the technical field of manufacturing a connector or the like, a manufacturing method in which a chain terminal formed by punching out a hoop material is pressed in the longitudinal direction of the hoop material while the chain terminal is pressed to adjust the terminal shape. Has been adopted. In the technical field of manufacturing diodes and resistors, etc., the resin provided on the surface of the diode is continuously formed by inserting the diode installed in the chain terminal into the thermosetting resin tank while sending it in one direction. The manufacturing method is adopted. Therefore, it is considered that continuous insert molding can be carried out by using an insert formed of a hoop material such as the chain terminal (hereinafter referred to as an insert chain).

[0005]

However, when the above insert chain is simply adopted for such insert molding, the following disadvantages may occur. That is, when an insert chain punched from a hoop material is used for insert molding, the insert chain is opened and closed by feeding it in the longitudinal direction of the hoop material and sandwiching the insert chain in the thickness direction by a mold placed in the middle position. Then, a cavity is formed between them. The molded body filled and cured in the cavity needs to be ejected from the cavity at the same time when the mold is opened. In this case, the opening / closing direction of the mold,
That is, it is necessary to eject the insert chain from the thickness direction by the ejector pin.

However, in this case, the insert chain is partially curved at the mold position, and it becomes difficult to maintain the pitch between the inserts with high accuracy.
If a punching device for the insert chain or a device for separating the product from the insert chain having the molded body is arranged before and after the mold, the processing accuracy cannot be ensured and the quality of the product deteriorates. Inconvenience may be caused.

Moreover, the molded body that is ejected by the ejector pin is sent in the longitudinal direction together with the insert chain. However, the ejector pin protruding the molded body is in contact with the molded body, and in some cases,
Since the insert chain is slightly digging into the molded body, when the insert chain is moved in its longitudinal direction, the molded body is twisted by the ejector pin, which may cause damage to the product.

Further, since the mold is heated to about 70 ° C. by the molten resin filled in the cavities, thermal expansion occurs in the insert chain set in the cavities, so that the inserts in the mold parts are separated from each other. There is an inconvenience that the pitch becomes wider. Therefore, there is a problem in that the pitch between the inserts in the mold and the pitch between the inserts in the separating device and the like arranged in the subsequent stage of the mold become uncertain, and the product accuracy deteriorates. .

The present invention has been made in view of the above-mentioned circumstances, and while ensuring the pitch between the inserts with high accuracy, the insert chain is sent without twisting the molded body, and the inserts are generated by the heat of the die. It is an object of the present invention to provide a continuous insert molding apparatus capable of continuously molding highly accurate products by controlling chain deformation.

[0010]

In order to achieve the above object, the present invention provides an insert chain which is formed in a strip shape by integrally connecting inserts arranged at regular intervals by a chain portion. A feed mechanism that intermittently moves in one direction of the arrangement direction while holding the linear shape,
In a cavity formed around the resin embedding portion, which has a pair of molds that are opened and closed so as to sandwich the resin embedding portion of each insert arranged in one end in the width direction of the insert chain in the thickness direction. A molding machine for filling the molten resin into the molding machine, and a cutting mechanism for cutting the chain portion from the insert embedded in the molded body in the latter stage of the molding machine in an array state on the frame, and A continuous insert molding apparatus is proposed in which a preheating unit for heating the insert chain is provided in the preceding stage, and a cooling unit for cooling the molded body is provided between the molding machine and the separating mechanism.

In the above continuous insert molding apparatus,
When the insert chain is moved by the feeding mechanism, a plurality of shift means are provided to press the insert chain in the thickness direction thereof to separate the end surface of the molded body from the dividing surface of the mold at intervals in the moving direction of the insert chain. It is effective if the configuration is adopted.

Further, a structure may be adopted in which a connecting member for connecting the shift means and simultaneously displacing the shift means is provided, and the connecting member is displaced by the same driving source as the mold, and further, it is formed in the moving direction of the shift means. The ejector pin that protrudes the body may be provided in the mold, and the ejecting mechanism that sets the displacement amount of the insert chain by the shift means to be larger than the protruding amount of the molded body by the ejector pin may be provided.

[0013]

According to the continuous insert molding apparatus of the present invention, the insert chain is intermittently moved in one direction in which the inserts are arranged while being held in a linear state by the operation of the feed mechanism. During the movement of the insert chain,
A mold is arranged and opened and closed in the thickness direction of the insert chain to form a cavity around each insert.

When the molten resin is filled in the cavity, the resin is hardened so as to surround the resin-embedded portion of the insert to form a molded body. In this case, the insert chain introduced into the mold is set to a desired temperature when the temperature of the insert chain is gradually raised in the preheating section and reaches the mold. Also, each insert molded resin in the mold, after being cooled to a desired temperature in the cooling unit arranged in the subsequent stage,
It will be introduced into the detachment mechanism.

As a result, it becomes possible to preset the pitch between the inserts due to the thermal expansion of the insert chain when they are introduced into the mold and the separating mechanism, respectively, and to improve the molding accuracy in the mold and the processing accuracy in the separating mechanism. It is possible to improve.

Further, in the above continuous insert molding apparatus, the operation of the shift means presses the insert chain in the thickness direction thereof to separate the end surface of the molded body from the divided surface of the mold. In this case, if a plurality of shift means are provided at intervals in the moving direction of the insert chain, it is possible to displace the insert chain at a plurality of positions at the same time, and to separate the insert chain from the mold while maintaining the linear state. Become.

Then, by moving the insert chain in the longitudinal direction thereafter, the end surface of the molded body is prevented from being twisted by the mold, and the product is maintained in a healthy state. The actuation of the shifting means also prevents the insert chain from being partially curved only near the mold. This makes it possible to prevent irregular deformation of the insert chain and set each insert in the mold and the separating mechanism with high accuracy.

Further, if a structure is provided in which a connecting member for connecting the shift means and simultaneously displacing it is provided and the connecting member is displaced by the same drive source as the mold, it is synchronized with the opening / closing operation of the mold. Since the connecting member is displaced,
With a simple structure, the shift means can be displaced simultaneously,
It is possible to separate the insert chain from the dividing surface of the mold while keeping the insert chain in a straight state. Further, since the displacement of the insert chain can be synchronized with the opening / closing operation of the mold, continuous insert molding can be efficiently performed.

Further, the die is provided with an ejector pin for ejecting the molded body in the moving direction of the shift means, and a projecting mechanism for setting the displacement amount of the insert chain by the shift means to be larger than the projecting amount of the molded body by the ejector pin. Then, the molded body molded in the cavity is reliably taken out by the ejector pin, the ejector pin and the molded body are separated by the ejecting mechanism, and when the insert chain is moved by the feeding mechanism,
The molded body is prevented from being twisted by the ejector pin, and the soundness of the product is maintained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the continuous insert molding apparatus according to the present invention will be described below with reference to FIGS. The continuous insert molding apparatus 1 according to the present embodiment, for example, continuously molds the product 2 shown in FIG.
The insert chain 3 shown in is used. In FIG. 7, reference numeral 4 is a metal insert, 5 is a molded body made of injection-molded resin, and 6 is a resin embedding portion which is embedded in the molded body 5 by insert molding.

Further, in FIG. 8, reference numeral 7 is a first chain portion, 8 is a second chain portion, 9 is a tie bar for connecting the inserts 4 to each other to maintain strength during movement, and 10 is an insert chain. It is a positioning hole for the pilot pin for setting the movement pitch of 3. This insert chain 3 is formed by punching out a hoop material.

Continuous insert molding apparatus 1 according to this embodiment
As shown in FIG. 1, a feed mechanism 12 mounted on a single frame 11 and a first mechanism arranged on the resin embedding portion 6 side of the insert chain 3 moved by the feed mechanism 12. A punching mechanism 13 that separates the chain portion 7 from each insert 4, a molding machine 14 that is arranged in the subsequent stage of the punching mechanism 13 and forms the molded body 5 in the resin embedding portion 6, and a molding machine 14 that is arranged in the subsequent stage. The tie bar separating mechanism 15 for cutting the tie bar 9 from the product 2 in which the insert 4 is embedded in the molded body 5, the chain portion separating mechanism 16 for separating the second chain portion 8 from the insert 4 and the feeding mechanism 12 are used for movement. And a shift mechanism 17 for displacing the entire insert chain 3 upward when the insert chain 3 is moved.

In FIG. 2, reference numeral 18 is a reel portion, which holds the insert chain 3 in a wound state and which is provided with a feed mechanism 12
The insert chain 3 is supplied in accordance with the feeding operation by. Further, reference numeral 19 is the reel portion 18
And an idler arranged between the feed mechanism 12 and the feed mechanism 12.

The feeding mechanism 12 is, for example, the frame 1
1 is arranged at the front stage and immediately after the molding machine 14,
The gripper 20 holds the insert chain 3 and the moving mechanism 21 horizontally moves the gripper 20. The feed mechanism 12 arranged at the frontmost stage of the frame 11 is
It has two grippers 20.

The one gripper 20 is held in a fixed state with respect to the base 22, and is adapted to, for example, grip or release the insert chain 3 in the thickness direction by air. The other gripper 20 is horizontally moved by the moving mechanism 21 and repeats the operation of releasing the insert chain 3 gripped at the front end of its operating range at the rear end.

The moving mechanism 21 is, for example, a cylinder 2
3 and a linear guide 24 that supports the gripper 20 so that the gripper 20 can move horizontally. The cylinder 23 is operated to reciprocate the gripper 20 horizontally along the linear guide 24. Then, the fixed gripper 20 is opened while the insert chain 3 is moving, and the insert chain 3 is held while the other gripper 20 reaches the rear end and returns to the front end. Thus, the insert chain 3 can be intermittently moved along the arrangement direction of the mechanisms 13, 14, and 15.

The punching mechanism 13 includes a lower mold 25 arranged below the horizontally arranged insert chain 3 and the lower mold 2.
5 has a punching die 27 composed of an upper die 26 which is brought into contact with and separated from above, and the insert chain 3 is sandwiched in the thickness direction to cut the insert 4 and the first chain portion 7. . The upper die is supported by the tip of a rod 29a of a hydraulic cylinder 29 which is vertically supported by a support post 28. The hydraulic cylinder 29 is actuated so that it is displaced in the vertical direction and brought into contact with or separated from the lower die 25.

The molding machine 14 also has a die 32 composed of a fixed die 30 arranged below the insert chain 3 and a movable die 31 which is brought into contact with and separated from the fixed die 30 from above. By sandwiching the chain 3 in the thickness direction,
A cavity 33 for filling the molten resin is formed around the resin-embedded portion 6 of the insert 4.
The cavity 33 is formed for the plurality of inserts 4 to be arranged near the center of the mold 32. That is, with respect to one movement by the feed mechanism 12, the molded body 5 can be molded at one time into inserts 4 of a number obtained by dividing the stroke of the movement by the pitch between the inserts 4.

In the present embodiment, the cavity 33 is
As shown in FIG. 9, it is formed in a cylindrical shape that is vertically divided in half by the dividing surfaces 34 of the fixed die 30 and the movable die 31. Here, the radius dimension of the cavity 33 is R.

As shown in FIG. 1, the mold 32 of the molding machine 14 is provided in front of the central portion forming the cavity 33.
A sufficiently large area is ensured so that the insert chains 3 can be brought close to each other so as to sandwich the insert chains 3 in the thickness direction, whereby the insert chains 3 can be inserted before being introduced into the cavity 33.
A preheating section 35 for heating the is formed. The preheating unit 35 raises the temperature of the insert chain 3 to about 70 ° C. when introduced into the cavity 33. As a result, the pitch between the inserts 4 in the insert chain 3 is slightly increased as compared with that at the normal temperature, so that the pitch between the cavities 33 is formed large in advance in consideration of the increase.

Further, the molding machine 14 has a cooling section 3 having a sufficient space between the molding machine 14 and a separating mechanism 15 arranged behind the molding machine 14.
6 are provided so that the insert chain 3 introduced into the separating mechanism 15 is sufficiently cooled so that the pitch between the inserts 4 becomes equal to the dimension at room temperature. Further, as shown in FIGS. 10 and 11, the mold 32 of the molding machine 14 is provided with an ejector pin 37 which is arranged in a penetrating state in the fixed mold 30 and is moved back and forth in the cavity 33, which will be described later. By the ejecting mechanism 38, the molded body 5 molded in the cavity 33 is projected upward.

The tie bar separating mechanism 15 and the chain portion separating mechanism 16 are also brought into contact with and separated from the lower molds 39 and 40 arranged below the horizontally arranged insert chain 3 and from above the lower molds 39 and 40. It has punching dies 43 and 44 composed of upper dies 41 and 42, and sandwiches the insert chain 3 in the thickness direction to form a connecting portion between the insert 4 and the second chain portion 8 and a tie bar 9 between the inserts 4, respectively. The product 2 is cut off by cutting. Then, the separated product 2 is dropped and collected through a passage (not shown) provided in each separating mechanism 15 and 16, and the separated second chain portion 8 is collected in the collecting portion 53. ing.

The lower die 25 of the punching mechanism 13 and the lower die 39 of the tie bar separating mechanism 15 and the chain portion separating mechanism 16
A pilot pin (not shown) inserted into the positioning hole 10 provided in the insert chain 3 is provided at 40. This pilot pin has a shift mechanism 1 which will be described later.
The insert chain 3 is formed to have a height smaller than the ascending / descending distance of the insert chain 3, and when the insert chain 3 is moved, the insert chain 3 can be raised to a position where it is completely extracted from the pilot pin. On the other hand, during the punching process and the cutting process, the insert chain 3 can be reliably positioned in the lower molds 25, 39, 40 while being completely inserted into the positioning hole 10.

The shift mechanism 17 includes a lifter bar (connecting member) 45 which is arranged over substantially the entire length of the frame 11.
And fixed to the lifter bar 45, respectively provided for the feeding mechanism 12, the punching mechanism 13, the molding machine 14, the tie bar separating mechanism 15, the chain separating mechanism 16 and the ejecting mechanism 38 for driving the ejector pin 37. The lifter 46 is provided.

The lifter bar 45 includes a slide rod 48 slidably supported in a vertical direction in a support sleeve 47 fixed to the frame 11, and a hydraulic pressure for driving the mold 32 of the molding machine 14. A drive source (not shown) can be moved in the vertical direction while maintaining the horizontal state. Further, as the ascending / descending distance of the lifter bar 45, a value larger than at least the radius R of the cavity 33 is selected.

The lifter 46 is erected vertically on the upper surface of the lifter bar 45 and penetrates the frame 11 to be connected to each mechanism such as the feeding mechanism 12.
The lifter 46 provided in the feed mechanism 12 is configured to move the gripper 20 and its moving mechanism 21 together with the base 22 up and down.

Punching mechanism 13, tie bar separating mechanism 15
And the lifter 46 provided in the chain separating mechanism 16
Lifts the lifter plate 49 forming part of the upper surface of the lower molds 25, 39, 40. The lifter plate 49 is arranged as shown in FIGS.

FIG. 4 shows the lifter plate 49 of the punching mechanism 13, FIG. 5 shows the lifter plate 49 of the tie bar separating mechanism 15, and FIG. 6 shows the lifter plate 49 of the chain separating plate. As shown in FIGS. 4 to 6A, these lifter plates 49 are adapted to be lifted by the lifter bar 45 via the lifter 46.

As a result, the insert chain 3 placed on the upper surface of the insert mold 3 can be conveyed while being separated from the lower molds 25, 39, 40. Further, as shown in FIGS. 4 to 6B, the lifter plate 49 is lowered as the lifter bar 45 is lowered to position the insert chain 3 on a pilot pin (not shown). As a result, the insert chain 3 in the positioned state is transferred to the upper mold 26.41.42 and the lower mold 25.3.
The chain portions 7 and 8 and the tie bar 9 are cut so as to be sandwiched between the portions 9 and 40.

Further, the lifter 4 provided in the molding machine 14
As shown in FIG. 1, 6 is a part of the surface of the fixed mold 30 which is arranged immediately before and after the mold 32 and is arranged so as to overhang the mold 32 and is lowered. The lifter plate 49 that forms the vertical axis is moved up and down. The lifters 46 are biased downward by springs 50, respectively, to reliably push down the lifter bar 45 whose hydraulic pressure has been released, so that the insert chain 3 is lowered to the dividing surface 34 of the fixed mold 30. ing.

Further, the projecting mechanism 38 is provided with the lifter bar 4 as shown in FIGS. 1, 10 and 11, for example.
5 and a biasing means 5 for constantly biasing the ejector pin 37 upward with respect to the lifter 46.
1 and the ejector pin 37 provided in the fixed mold 30 while the lifter 46 is being lifted by the lifter bar 45.
And an abutting portion 52 that locks the rise of the. As a result, the molded body 5 molded in the cavity 33 becomes
As shown by the solid line in FIG. 11, the tip of the ejector pin 37 projects upward from the cavity 33, and thereafter, as shown by the chain line in FIG.
The molded body 5 of the insert chain 3 that is further raised by the above is separated from the tip of the ejector pin 37 by stopping the rise of the ejector pin 37.

The operation of the continuous insert molding apparatus 1 according to this embodiment having the above structure will be described below. First, the insert chain 3 formed by punching out the hoop material wound around the reel portion 18 is intermittently moved in the longitudinal direction by a predetermined stroke by the operation of the feeding mechanism 12.

Insert chain 3 by this feeding mechanism 12
The mold 32 of the molding machine 14 is opened while the shift mechanism 17 having the same hydraulic drive source as that of the mold 32 is lifted by the lifter bar 45. As a result, as shown in FIG.
The lifter plate 49 provided on itself and the punching mechanism 13, the molding machine 14, the tie bar separating mechanism 15 and the chain portion separating mechanism 16 is lifted, and the insert chain 3 is simultaneously pushed up at each position in its longitudinal direction. As a result, the insert chain 3 is raised as a whole while maintaining the straight state of being horizontally arranged, so that the pitch between the inserts 4 is maintained without being changed.

Next, the insert chain 3 horizontally moved by a predetermined stroke by the feed mechanism 12 is lowered by the lifter 46 of the shift mechanism 17, whereby the punching mechanism 13, the tie bar separating mechanism 15 and the chain separating mechanism 16 are moved. And the lower molds 25 and 39 of the molding machine 14
40 and the fixed mold 30. At the same time, in the punching mechanism 13, the upper die 26 is moved to the lower die 2
The insert 4 and the first chain portion 7 are separated by being brought close to each other from above the insert chain 3 arranged on the upper surface of the insert 5, and the resin-embedded portion 6 side of the insert 4 is arranged in a free state. At this time, in the insert chain 3, the pilot pin of the lower die 25 is inserted into the positioning hole 10 formed in the second chain portion 8 so that the insert chain 3 is reliably positioned with respect to the lower die 25.

Then, the insert chain 3 separated from the first chain part 7 is introduced into the molding machine 14, but before being introduced into the cavity 33, the insert chain 3 is temporarily cooled in the preheating part 35. It is heated to a predetermined temperature by being sandwiched between the molds 32. As a result, the pitch between the inserts 4 can be matched with the pitch between the cavities 33 of the mold 32 manufactured in consideration of the amount of thermal expansion, and the inserts 4 are accurately positioned with respect to the respective cavities 33. It becomes possible.

Next, in the molding machine 14, the movable die 31 is brought into close contact with the fixed die 30 from above the insert chain 3,
A cavity 33 is formed around the resin-embedded portion 6 of each insert 4.
To form. Then, a molten resin injected from a nozzle (not shown) is filled in the cavity 33 and cured to form a cylindrical molded body 5 in which the resin-embedded portion 6 of the insert 4 is cast.

At the same time when the mold 32 is opened, the shift mechanism 17 is actuated, and the lifter bar 4 is moved.
5 and the lifter 46 fixed thereto are lifted, and the ejector pin 37 arranged in the fixed die 30 projects the molded body 5 in the cavity 33 upward by the operation of the projecting mechanism 38. In this case, when the molded body 5 is ejected to a predetermined position, the ejector pin 37 is fixed to the fixed mold 3.
0 is abutted against the abutting portion 52 provided at 0, and further upward movement is limited, while the lifter 46 continues to raise the insert chain 3, so that the ejector pin 37 is separated from the surface of the molded body 5. Will be done.

When the insert chain 3 to which the molded body 5 is attached is lifted to the upper limit by the lifter 46, the pilot pin is pulled out from the positioning hole 10 provided in the second chain portion 8. As a result, the insert chain 3 can be moved horizontally, so that the feed mechanism 12
Is moved by the operation of.

The insert chain 3 to which the molded body 5 is attached is sent to the tie bar separating mechanism 15 and the chain part separating mechanism 16 arranged at the subsequent stage of the molding machine 14 by the operation of the feed mechanism 12, Cooling unit 36 provided between the machine 14 and the separating mechanisms 15 and 16
For a predetermined time, that is, for a required time of several strokes, it is sufficiently cooled. As a result, when the insert chain 3 is introduced into the tie bar separating mechanism 15, the thermal expansion that has occurred in the molding machine 14 is extinguished, the pitch between the inserts 4 is set to a predetermined dimension, and the tie bar separating mechanism 15 has a predetermined pitch. Punching die 4
It will be avoided that a positional shift occurs between the position and the position. The same applies to the chain separating mechanism 16. As a result, it becomes possible to accurately cut the tie bar 9 and the second chain portion 8 from the insert 4 and obtain a smooth cut surface without burrs.

As described above, according to the continuous insert molding apparatus 1 of this embodiment, since the insert chain 3 formed by punching the hoop material is adopted, the insert 4 is continuously supplied into the cavity 33. be able to. Also, punching the first chain portion 7 while sending the insert chain 3,
Since the insert molding and the work of separating the tie bar 9 and the second chain portion 8 are sequentially performed, the insert 4 is formed into the molded body 5.
It is possible to mass-produce the finished product that has been cast in.

Moreover, since the insert chain 3 is intermittently moved by the feed mechanism 12, each separating mechanism 15
When the insert 4 for one stroke is separated from the second chain portion 8 in 16, the molding machine 14 performs insert molding, and the punching mechanism 13 separates the first chain portion 7. In this way, since each work proceeds at the same time, waste of work is eliminated, and the product can be manufactured efficiently.

In this case, in the continuous insert molding apparatus 1 of this embodiment, when the insert chain 3 is moved, the shift means 17 is operated to divide the molded body 5 molded in the cavity 33 into the fixed dies 30. Since the molded body 5 is arranged above the surface 34, the molded body 5 is prevented from coming into contact with the mold 32, and the soundness of the product can be secured. Moreover, since the shift means 17 simultaneously pushes up the insert chain 3 arranged on the frame 11 at a plurality of positions in the longitudinal direction, the shift means 17 is pushed up while being held linearly.

Therefore, the insert chain 3 is prevented from being partially curved, irregular deformation of the insert chain 3 is avoided, and the pitch between the inserts 4 can be maintained at a predetermined dimension. As a result, the punching mechanism 1
3, the pitch between the inserts 4 in the molding machine 14, the separating mechanisms 15 and 16 and the like can be maintained at a predetermined dimension to obtain a smooth cut surface without burrs. This eliminates the need for post-processing steps such as deburring work and improves manufacturing efficiency.

When the insert chain 3 is moved,
Since the ejector pin 37 that protrudes the molded body 5 from the cavity 33 is separated from the molded body 5, the molded body 5 is not twisted by the ejector pin 37 and the soundness of the molded body 5 can be maintained.

At the position of the die 32 of the molding machine 14 which is heated by the molten resin, the pitch between the inserts 4 of the insert chain 3 is increased by thermal expansion. However, in the continuous insert molding apparatus 1 of the present embodiment, the insert chain 3 is preheated in the preheating section 35 arranged in the preceding stage of the mold 32, so the mold 3
It is possible to manufacture the second cavities 33 in advance at a pitch that allows for thermal expansion. Therefore, each insert 4 can be arranged in the regular position of the cavity 33, and the quality of the product can be maintained.

Further, the cooling unit 3 arranged in the latter stage of the die 32.
6, the temperature of the insert chain 3 is reduced, and the pitch between the inserts 4 is set to a predetermined dimension. Therefore, in the separating mechanism 15, 16 arranged in the subsequent stage, the second chain portion 8 and the tie bar 9 are accurately adjusted. Can be cut well. As a result, similarly to the above, it is possible to manufacture a high quality product having the smooth insert 4 without burrs.

In this embodiment, the continuous insert molding apparatus is applied when manufacturing a product in which the cylindrical molded body 5 is attached to the insert 4. However, this product shape is not particularly limited. Instead, it can be applied to products of any other shape. Further, although the feed mechanism 12 is provided in the front stage of the punching mechanism 13 and the rear stage of the molding machine 14, the location and the number thereof may be arbitrary. Also,
Although the gripper 20 driven by air is mounted, the driving method is not limited to air, and any actuator such as a motor may be applied.

Further, in the molding machine 14, the mold 32 having four cavities 33 has been described as an example, but the present invention is not limited to this and has a plurality of cavities 33 arranged at least at a constant pitch. The mold 32 may be adopted. Further, although the cooling unit 36 for cooling the insert chain by natural cooling is provided by the space provided between the molding machine 14 and the tie bar separating mechanism 15, instead of this, for example, cooling air is blown. Forced cooling means may be provided.

[0059]

The continuous insert molding apparatus according to the present invention has a feed mechanism for intermittently moving the insert chain in one direction while holding the insert chain linearly, and is opened and closed so as to sandwich the insert chain in the thickness direction. A molding machine that fills the molten resin into the cavity formed around the resin embedding portion of the insert by a pair of molds, and a separating mechanism that cuts the chain portion from the insert embedded in the molded body that is arranged in the subsequent stage. Since it is equipped on the frame in an arrayed state, a pre-heating unit is provided in the preceding stage of the molding machine, and a cooling unit is provided between the molding machine and the separating mechanism, the insert chain introduced into the molding machine by the pre-heating unit is By setting the temperature to a predetermined temperature, it is possible to design a mold that allows for thermal expansion in advance, and it is possible to accurately arrange the insert in the molded body. As a result, the quality of the product can be improved.

Further, since the insert chain introduced into the separating mechanism by the cooling section can be set to a predetermined temperature, the insert and the chain section can be cut at an accurate position, and the cut surface is burred. Since it can be finished smoothly without any post-processing steps such as deburring work, manufacturing efficiency can be improved. Moreover, since the insert chain is used to continuously supply the inserts by the feeding mechanism, a large amount of insert molding can be performed quickly and efficiently.

Further, in the above continuous insert molding apparatus, when the insert chain is moved by the feeding mechanism, the shift means presses the insert chain in its thickness direction to separate the end surface of the molded body from the split surface of the mold, If a plurality of insert chains are provided at intervals in the moving direction of the insert chain, in addition to the above effects, it is possible to prevent the molded body from being damaged by the mold and improve the quality of the product. Produce an effect.

Further, since the insert chain is pressed at a plurality of points, only the insert chain arranged in the vicinity of the mold is not partially curved, and the irregular deformation of the insert chain is avoided, and the insert chain is avoided. The pitch between them can be maintained at regular dimensions. Therefore, it is possible to prevent the positional deviation of the insert in the separating mechanism or the like and improve the processing accuracy.

Further, in the above continuous insert molding apparatus, if the connecting member for connecting the shift means and simultaneously displacing the connecting member is provided and the connecting member is displaced by the same driving source as the mold, the mold is made. The shift means is operated in synchronism with the above operation, and the insert chain can be easily and reliably separated from the mold.

Further, the die is provided with an ejector pin for ejecting the molded body in the moving direction of the shift means, and a projecting mechanism for setting the displacement amount of the insert chain by the shift means to be larger than the projecting amount of the molded body by the ejector pin. Then, when the insert chain is moved,
The molded body and the ejector pin can be separated from each other to prevent the molded body from being twisted by the ejector pin. As a result, the molded body can be maintained in a sound state and the quality of the product can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a continuous insert molding apparatus according to the present invention.

FIG. 2 is a front view showing the overall configuration of the continuous insert molding apparatus of FIG.

FIG. 3 is a partially cutaway front view showing a state when the insert chain is conveyed in the continuous insert molding apparatus of FIG.

FIG. 4 is a perspective view showing a lifter plate of a punching mechanism of the continuous insert molding apparatus of FIG.

5 is a perspective view showing a lifter plate of a tie bar punching mechanism of the continuous insert molding apparatus of FIG. 1. FIG.

6 is a perspective view showing a lifter plate of a chain punching mechanism of the continuous insert molding apparatus of FIG. 1. FIG.

FIG. 7 is a front view showing an example of a final product manufactured by the continuous insert molding apparatus of FIG.

8 is a front view showing an example of an insert chain used in the continuous insert molding apparatus of FIG. 1. FIG.

9 is an enlarged cross-sectional view showing a mold of a cavity portion in the continuous insert molding apparatus of FIG.

10 is a vertical cross-sectional view for explaining a projecting mechanism in the continuous insert molding apparatus of FIG.

11 is a vertical cross-sectional view for explaining the operation of the protrusion mechanism of FIG.

[Explanation of symbols]

 1 Continuous Insert Molding Device 3 Insert Chain 4 Insert 5 Molded Body 6 Resin Embedding Part 7 First Chain Part (Chain Part) 8 Second Chain Part (Chain Part) 11 Frame 12 Feed Mechanism 14 Molding Machine 15 Tie Bar Separation Mechanism 16 Chain Part Separation Mechanism 17 Shift Means 32 Mold 33 Cavity 34 Dividing Surface 35 Pre-heating Part 36 Cooling Part 37 Ejector Pin 38 Ejecting Mechanism 45 Lifter Bar (Coupling Member)

Claims (4)

[Claims] 1. An insert chain, which is formed in a strip shape by integrally connecting inserts arranged at regular intervals by a chain portion, while holding the insert chain linearly, intermittently in one direction of the array direction. And a pair of molds that are opened and closed so as to sandwich the resin embedding portion of each insert arranged at one end in the width direction of the insert chain in the thickness direction, and the resin embedding portion A molding machine for filling the molten resin into the cavity formed around the molding machine, and a separating mechanism for cutting the chain portion from the insert embedded in the molding body, which is arranged at the subsequent stage of the molding machine, are arranged in an array on the frame. In addition, a preheating unit that heats the insert chain is provided in the preceding stage of the molding machine, and a cooling unit that cools the molded body is provided between the molding machine and the separating mechanism. Continuous insert molding apparatus. 2. A shift means for pressing the insert chain in its thickness direction to separate the end surface of the molded body from the split surface of the mold when the insert chain is moved by the feeding mechanism.
2. The continuous insert molding device according to claim 1, wherein a plurality of insert insert molding devices are provided at intervals in the moving direction of the insert chain. 3. The continuous insert molding apparatus according to claim 2, wherein a connecting member for connecting the shift means and simultaneously displacing it is provided, and the connecting member is displaced by the same drive source as the mold. . 4. The ejector pin for ejecting the molded body in the moving direction of the shift means is provided in the mold, and the displacement amount of the insert chain by the shift means is set to be larger than the protruding amount of the molded body by the ejector pin. The continuous insert molding apparatus according to claim 2 or 3, wherein a mechanism is provided.