KR100641790B1 - Insert moulding - Google Patents

Abstract

A pump impeller insert mold is provided to improve quality of an impeller by permitting a first post to retreat by the pressure of a resin filling a cavity and a second post to retreat from an insert when the first post is retreated to a predetermined position. A pump impeller insert mold(1) comprises a base core(10), a first post(20), a second post(30), a sensor(45), and a micro computer. The base core is coupled to one side of a lower template(3), and has a vertical installation hole connected to a cavity(4) and a horizontal installation hole extended from the vertical installation hole in a horizontal direction. The base core has one side in which a hydraulic cylinder(36) is arranged. The first post is arranged on the vertical installation hole of the base core in such a manner that the first post is movable in a vertical direction. The first post moves in an upward direction by the support force of an elastic member(25) so that an upper outer surface of the first post supports an inner surface of an insert(5a). The first post retreats by the pressure of resin which fills the cavity. The second post is arranged on an outer surface of the first post. A movable plate(35) is integrally connected to the second post so that the second post selectively retreats. The movable plate has a top supporting the insert and a bottom arranged in the horizontal installation hole so that the movable plate is movable in an upward direction by the hydraulic cylinder. The sensor is arranged to sense the position of the first post. The micro computer receives signals from the sensor, and operates the second post by controlling the hydraulic cylinder.

Description

Impeller Insert Mold for Pumps {insert moulding}

1 to 3 is a cross-sectional view showing the operation of the impeller insert molding mold for pumps according to the present invention,

Figure 4 is an exploded perspective view of the main part of the impeller insert molding mold for pumps according to the present invention,

Figure 5 is a perspective view showing a combined state of the impeller insert molding die for the pump according to the present invention.

Figure 6 is a cross-sectional view showing an impeller molded by the impeller insert molding mold for the present invention,

7 is a conceptual diagram for explaining the operation control of the microcomputer of the present invention;

8 is a cross-sectional view showing an impeller molded by an impeller insert molding die for a pump according to the prior art.

<Explanation of symbols for the main parts of the drawings>

DESCRIPTION OF SYMBOLS 1: Mold 2: Upper plate 3: Lower plate

4: cavity 5: impeller 5a: insert

10: base core 20: first post 20a: flange

25: elastic body 30: second post 30a: extension portion

31 support pin 35 movable plate 36 hydraulic cylinder

36a: Load 40: Micom 45: Detector

The present invention relates to an impeller insert molding mold for a pump, and more particularly, to improve the quality of the impeller by increasing the productivity of the impeller by selectively retracting the support post supporting the insert by the pressure of the resin filled in the cavity. It relates to an impeller insert molding die for pumps.

In general, the upper mold and the lower die are molded together so that the same cavity as the shape of the product to be molded is formed, and the molten resin is injected into the cavity at high pressure to mold the product.

In the molding of the product by the injection mold, the insert molding product is injected into the mold of the injection mold by inserting the molten resin in the state of inserting and supporting the separately produced insert into the cavity of the injection mold due to the manufacturing problem of the withdrawal mold. do. That is, in the process of molding the product for insert molding, a support structure for supporting the insert inserted in the cavity so as not to flow during the injection molding is required.

In more detail, the insert molding is formed by installing the insert (Insert) which is a part of the pre-molded finished product in the mold, and then by injecting heterogeneous synthetic resins to one side or the entire outer surface of the insert (Insert) It is a method of injection molding that produces the final molded finished product in which the over water is closely adhered.

The most important thing in the insert molding method is the adhesion between the two dissimilar materials and the appearance quality of the finished product.

In a conventional plastic insert molding method, at least two or more templates that form a cavity as a molding space when the mold is closed are placed, that is, preformed inserts are placed inside the upper and lower mold plates, and then the upper and lower molds are placed. Molten resin is injected into the upper surface of the insert through the sprue and runner with the plate closed.

Subsequently, after the molten resin is filled into the cavity formed by the mold and the insert, after the cooling process is performed for a predetermined time while the over water is settled, the mold is opened and the over water is integrated into the insert to take out a molded article. It goes through the process of ejection.

However, such a mold for insert molding is provided with a support for contacting and supporting one side of the insert in order to prevent the insert from flowing during the injection process, such a support to form a hole in the molded article when the molded product is taken out As a result, it is not only a direct factor that impairs the quality of the molded product, but also requires post-processing to fill the holes, resulting in a decrease in productivity and an increase in defective rate.

That is, Figure 8 is a cross-sectional view showing a pump impeller 100 according to the prior art.

As shown in this figure, the impeller 100 is a structure provided with the insert 110 which has a hollow tubular shape comprised from a magnet and a frame.

Briefly describing the insert molding process of the impeller 100, the inner surface and the lower surface of the insert is supported using two supports (a, b) in the cavity formed between the upper plate and the lower plate, in this state The molten resin is injected into the cavity. Then, after the injected resin is solidified, the impeller 100 molded from the mold is taken out while retracting the supports a and b.

In the conventional impeller 100 formed by the above method, since the holes h are formed by the supports a and b in the state where the molding is completed, a separate finishing member m to fill these holes h is filled. In addition to the need for the finishing work to be provided by welding, etc., if the finishing work is insufficient, the insert 110 of the magnet and the frame may be corroded, resulting in deformation and damage of the entire shape of the impeller 100. In addition, as a result, such as adversely affects the driving performance of the pump caused a problem that greatly reduces the reliability of the product.

The present invention has been made to solve the above problems, the support supporting the insert by the resin pressure filled into the cavity during the injection retreat to prevent the unmolded by the support on the finished molded product in advance and the finished molded product The present invention provides an impeller insert molding die for a pump that can improve reliability by improving quality.

Pump impeller insert molding mold according to an embodiment of the present invention for realizing the above object, the upper and lower molds having a cavity for insert molding the impeller for pump in which the tubular insert is embedded In insert molding mold,

A base core coupled to one side of the lower die plate and having a vertical installation hole connected to a cavity therein and a horizontal installation hole extending in a horizontal direction at a lower side of the vertical installation hole and having a hydraulic cylinder built into one side thereof; The first post which is installed to be able to move up and down on the vertical installation hole of the base core is raised by the support force of the elastic body provided on the lower side, and the upper outer circumferential surface supports the inner circumferential surface of the insert and is retracted by the resin pressure filled in the cavity. ; A second post provided to be capable of elevating to an outer circumferential surface of the first post, and having an upper end supporting a bottom of the insert and a lower end being provided in a horizontal installation hole, the movable plate being elevated by an hydraulic cylinder integrally connected and being retreated selectively; It is characterized in that it comprises a detector installed on one side of the vertical installation hole to detect the falling position of the first post and the microcomputer to operate the second post by controlling the hydraulic cylinder by receiving a signal from the detector.

As a preferred feature of the present invention, the lower end of the first post is a flange is formed thereon is provided with a coil spring of the elastic body, the lower portion of the second post is the coil spring while limiting the lifting height of the first post An extension part which is extended in proportion to the diameter of the flange to be accommodated is integrally formed.

In another preferred aspect of the present invention, the hydraulic cylinder is configured to connect a rod that is linearly moved in the vertical direction by the input and output of the hydraulic pressure to one side of the movable plate, the second post slides up and down on the upper outer peripheral surface of the second post There is provided a tubular holder that can be supported.

In another preferred aspect of the present invention, the second post is formed by integrally forming a support pin that protrudes upward at equal intervals to support the bottom of the insert.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are consistent with the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain the invention in the best way. It must be interpreted as meaning and concept.

Hereinafter, a preferred embodiment of the impeller insert molding mold for a pump according to the present invention with reference to the accompanying drawings.

1 is a cross-sectional view showing a state where the first post and the second post support the insert positioned in the cavity of the mold, and FIG. 2 is a resin injected into the cavity and the first post is retracted by the resin pressure. 3 is a cross-sectional view illustrating a state in which an upper surface of the second post coincides with an upper surface of the second post, and FIG. 3 is a cross-sectional view illustrating a state in which the first post and the second post are separated from the insert.

And, Figure 4 is an exploded perspective view of the main part of the pump impeller insert molding mold according to the present invention, Figure 5 is a perspective view showing a combined state of the pump impeller insert molding mold according to the present invention. Finally, Figure 6 is a cross-sectional view showing an impeller formed by the impeller insert molding mold for a pump of the present invention, Figure 7 is a conceptual diagram for explaining the operation control of the microcomputer of the present invention.

As shown therein, the impeller insert molding mold 1 according to the present invention includes upper and lower mold plates 2 and 3 forming an injection space for forming the impeller 5, that is, a cavity 4. A base core 10 integrally coupled to one side of the upper and lower die plates 2 and 3 to provide a space for installing a component for supporting the insert 5a of the impeller 5, and the insert The first post 20 and the second post 30 which respectively support the inner side and the bottom surface of 5a, and the microcomputer 40 for selectively retracting the said 2nd post 30 are comprised.

Upper and lower plate (2, 3) is provided in a structure that is selectively joined or separated from each other, the cavity 4 for forming the impeller (5) is formed therein.

The upper plate 2 is formed such that a runner gate for resin injection is connected to the cavity 4 at an upper center portion thereof, and the lower plate 3 is formed of a single metal plate having a predetermined thickness or a plurality of sheets. The base core 10 which laminated | stacked the metal plate material is couple | bonded.

Here, the upper and lower mold plates (2, 3) may be implemented by a known technique, so detailed description thereof will be omitted.

The base core 10 is a structure in which the upper side is in close contact with the lower side of the lower die plate 3 through a screw member such as a bolt, and is integrally connected, and uses a single metal plate having a predetermined thickness or It can be configured by stacking a plurality of metal plates.

The base core 10 has a vertical installation hole (unsigned) vertically connected to the lower side of the cavity 4 as shown in the figure, and a horizontal installation hole (unsigned) extending in the horizontal direction from the lower side of the vertical installation hole. An inner space is formed, and one side of the inner space is provided with a hydraulic cylinder 36 for selectively mounting the rod 36a by hydraulic pressure.

The base core 10 configured as described above includes a first post 20 and a second post 30 on a vertical installation hole, and a movable plate 35 on the horizontal installation hole.

The first post 20 is a member having a tubular shape which is installed to be elevated on the vertical installation hole of the base core 10 as described above, and a flange 20a having a shape in which a diameter thereof is extended to a lower outer periphery is formed. The first post 20 is provided with a coil spring, which is an elastic body 25, below the flange 20a, and maintains a state in which the coil spring is moved upward by the elastic force of the coil spring, wherein the upper outer circumferential surface thereof is the cavity 4. The inner peripheral surface of the insert (5a) located in the inner side is in contact with the support.

When the resin is injected into the cavity 4, the first post 20 configured as described above is gradually retracted by the injection pressure of the resin to release the bearing force on the inner surface of the insert 5 a.

The second post 30 is a tubular member which is provided to be lifted and lowered to the outer circumferential surface of the first post 20 as described above. The second post 30 can slide smoothly with each other while the first post 20 is fitted. An extension portion 30a extending in proportion to the diameter of the flange 20a so as to accommodate the coil spring which is the elastic body 25 while limiting the lifting height of the first post 20. Is formed integrally.

The second post 30 has a structure in which an upper end portion integrally protrudes a plurality of support pins 31 so as to support the bottom surface of the insert 5a at equal intervals, and a lower end portion thereof is provided in a horizontal installation hole. The structure is coupled to the movable plate 35.

Here, the movable plate 35 is selectively lifted by one side thereof is connected to the rod (36a) of the hydraulic cylinder 36, the horizontal installation hole in which the movable plate 35 is installed is the movable plate 35 In order to limit the retreat position of the), that is, the movable plate 35 has a free space so that it can be moved up and down in the horizontal installation hole.

On the other hand, the movable plate 35 is raised and lowered by the hydraulic cylinder 36, wherein the hydraulic cylinder 36 is a structure for advancing or retracting the rod 36a by the input and output of hydraulic pressure, such a hydraulic cylinder ( 36) may use a conventionally known technique, so detailed description thereof will be omitted.

On the other hand, the upper outer peripheral surface of the second post 30 is configured as described above is preferably configured to additionally configure a tubular holder (h) for supporting the second post 30 to ensure a stable slide lift operation. The holder (h) is a structure that is fixed fixed on the vertical installation hole.

The second post 30 configured as described above includes the movable plate 35 when the first post 20 described above retreats due to the resin pressure and the upper surface reaches a point coinciding with the upper surface of the second post 30. By this gradually descending, they are integrally interlocked and separated from the insert 5a.

When the first post 20 passes through a predetermined point when the first post 20 is retracted by the resin pressure, the microcomputer 40 senses this through the detector 45 to allow the movable plate 35 to retreat. To the control signal. Here, the detector 45 is installed on one side of the vertical installation hole to detect the retreat state of the first post 20, and detailed descriptions thereof will be omitted since the sensors of various methods may be used.

The microcomputer 40 configured as described above performs a control operation of returning the hydraulic cylinder 36 to its original position when the resin injected into the cavity 4 is completely solidified and then taken out to the upper and lower mold plates 2 and 3.

On the other hand, reference numeral (s) is a shaft for supporting the first post 20 and the second post 30, which is a lifting member, reference numeral 5 is a pump impeller, reference numeral 5a is a magnet and a frame It is the insert 5a which has a hollow tubular shape comprised.

Looking at the operation of the insert molding die of the present invention configured as described above with reference to Figures 1 to 3 as follows.

First, since the first post 20 and the second post 30 are positioned on the cavity 4 as shown in FIG. 1, the tubular inserts are formed on the first post 20 and the second post 30. Mount (5a). In this case, the first post 20 supports the inner circumferential surface of the insert 5a and the second post 30 supports the bottom surface of the insert 5a.

Subsequently, when the molten resin is injected through the runner gate formed at the upper center portion of the upper plate 2, the first post 20 overcomes the elastic force of the elastic body 25 by the resin pressure and retreats. In this case, as shown in FIG. 2, when the first post 20 retreats and reaches a point where the upper surface coincides with the upper surface of the second post 30, the detector 45 detects this and detects the detection signal to the microcomputer 40. Is authorized.

The microcomputer 40 receiving the sensing signal applies a control signal to the hydraulic cylinder 36 to advance the rod 36a, and the movable plate 35 is retracted by the advance of the rod 36a. Then, the second post 30 coupled with the movable plate 35 starts to retreat. As a result, the first post 20 and the second post 30 are completely inserted in the insert 5a as shown in FIG. 3. The retracted position is retracted, and the molten resin fills the empty space while the first post 20 and the second post 30 retreat, resulting in the insert 5a as shown in FIG. The unmolded part by the support which supports) is not generated.

On the other hand, the present invention is not limited to the described embodiments, it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention.

As an example, the present invention directly illustrates an impeller for a pump as an injection target, but may be applied to insert injection moldings of various forms, in which case the position, the number and the retraction of the post depending on the shape or the number of inserts. May be considered as appropriate.

Therefore, such modifications or variations will have to belong to the claims of the present invention.

When the impeller insert molding die for the pump constructed and operated as described above is retracted by the first post supporting the inner surface of the insert by the pressure of the resin filled in the cavity, the first post retreats to a predetermined position. By detecting this, the second post retreats in a direction away from the insert, and as a result, there is an advantage of preventing the unmolding by the support as before.

Therefore, it does not require separate finishing work due to the unmolding, so that it is possible to increase the production yield and at the same time standardize the product, and to increase durability, prolong the life of the product and improve the reliability of the product as the final molded product is finished. It can have a very useful effect in the industry.

Claims (4)

In the insert molding mold having upper and lower molds formed with a cavity for insert molding a pump impeller in which a tubular insert is embedded, A base core coupled to one side of the lower die plate and having a vertical installation hole connected to a cavity therein and a horizontal installation hole extending in a horizontal direction at a lower side of the vertical installation hole and having a hydraulic cylinder built into one side thereof; The first post which is installed to be able to move up and down on the vertical installation hole of the base core is raised by the support force of the elastic body provided on the lower side, and the upper outer circumferential surface supports the inner circumferential surface of the insert and is retracted by the resin pressure filled in the cavity. ; A second post provided to be capable of elevating to an outer circumferential surface of the first post, and having an upper end supporting a bottom of the insert and a lower end being provided in a horizontal installation hole, the movable plate being elevated by an hydraulic cylinder integrally connected and being retreated selectively; A detector installed at one side of the vertical installation hole and sensing a falling position of the first post, and a microcomputer operating the second post by controlling a hydraulic cylinder by receiving a signal from the detector; Impeller insert molding mold for pump, characterized in that comprising a. According to claim 1, wherein the first post is formed in the lower end of the flange having an expanded diameter form integrally is provided with a coil spring of the elastic body below the flange, the lower portion of the second post is the first post An impeller insert molding mold for a pump, characterized in that the expansion portion is formed integrally extended in proportion to the diameter of the flange to accommodate the coil spring while limiting the lifting height of the post. The hydraulic cylinder of claim 1, wherein the hydraulic cylinder is configured to connect a rod which is linearly moved in the up and down direction by hydraulic input and output to one side of the movable plate, and the second post is slideable on the upper outer circumferential surface of the second post. A pump impeller insert molding mold, characterized by comprising a tubular holder for supporting. The impeller insert molding mold for a pump of claim 1, wherein the second post protrudes upward at equal intervals at an upper portion thereof to integrally form a support pin for supporting the bottom surface of the insert.

Images