KR101223582B1 - Method that reinstate helical gear-ring using groove and pin and helical gear injection molding device that have groove and pin - Google Patents

Abstract

Disclosed are a method for returning a helical gear ring using a guide groove and a return pin, and a helical gear injection molding apparatus having a guide groove and a return pin. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus for injection molding plastic gears, and more particularly, in the injection molding apparatus for producing helical gear injections, to improve the precision of injections and to return gearing to produce plastic helical gears of uniform quality. A method and a helical gear injection molding apparatus to which the same method is applied.

Conventional gear injection molding apparatus for producing helical gears has a problem that it is difficult to produce helical gears of uniform shape or quality due to injection molding operation in which the gearing is rotated at a predetermined angle to take out the helical gears. There was.

The present invention has the effect of producing a helical gear of a uniform shape or quality by forming a guide groove and a return pin to accurately return the rotated gearing by using the mold closing force. By forming a cooling line in the gearing body, it is possible to produce a precise helical gear in a uniform form or quality through uniform cooling.

Helical gear, gearing, closing force, guide groove, return pin, direct cooling, cooling line

Description

HELMET THAT REINSTATE HELICAL GEAR-RING USING GROOVE AND PIN AND HELICAL GEAR INJECTION MOLDING DEVICE THAT HAVE GROOVE AND PIN }

The present invention relates to an injection molding apparatus, and more particularly, to an injection molding apparatus for injection molding a helical gear including a gearing for molding a helical gear.

Helical gear (helical gear) is a kind of cylindrical gear that is inclined at an oblique angle, it has a longer contact line than the spur gear can transmit a large force, and smoothly rotates has the advantage of relatively low noise.

However, such a helical gear is, as shown in the drawing for explaining the injection molding apparatus for molding the helical gear of Figure 1, the helical gear (1) has a problem that the molding is difficult compared to the general gear due to the inclined tooth angle. There is a problem that requires high precision.

In addition, as shown in FIG. 1, the apparatus 10 for injection molding a helical gear has the same configuration as a general injection molding apparatus, and in particular, the gearing 2 and the gearing in which teeth are processed to form a helical gear. It has a gearing fixing piece 3 which restrains 2) to one side mold | die.

At this time, the gear ring 10 is characterized in that coupled to the rotatable one side mold for taking out the helical gear (1) as shown in the figure showing one side mold of the helical gear injection molding apparatus of FIG.

That is, when the helical gear 1 injection-molded by a means such as the ejector of FIG. 1 is pushed out of the gearing 2, the gearing 2 rotates along the inclined teeth of the helical gear 1 to be ejected. In this way, the helical gear 1 can be taken out. If the gearing 2 does not rotate, the injection molded helical gear 1 cannot be taken out.

However, such rotation of the gearing 2 results in a problem of failing to produce the same injection molding produced in the same condition.

If the gearing 2 produces the helical gear 1 which is an injection product at the same position, all the injection products are injection products produced under the same conditions and thus the production quality can be kept constant.

However, as shown in the figure for explaining the rotation of the gearing, for example, assuming that the gearing 2 is rotated by 20 ° in one ejection ejection, for example, the gearing 2 only takes place 18 times in total. This initial position is returned, in which case the first injection and the 19th injection are molded under the same conditions and the production quality is the same.

As a result, the molding conditions according to the position of the eighteen gearing (2) occurs in the above case.

In such a case, it is a situation where the rotational angle is assumed to be 20 ° at the time of taking out, and in reality, almost all moldings are not produced under the same conditions.

Therefore, in the injection molding of the helical gear 2 requiring precision, such a problem causes a problem that it is difficult to maintain the production quality of the helical gear 2 which is an injection product.

In order to solve the above problems, there was a method of returning the rotated gearing to the original position by using a spring, but such a method has to be replaced after using the spring for a certain time due to the change of the elastic force of the spring itself and the mold. The problem is that the structure itself becomes complicated. In addition, there is a problem that a force may be applied to the injection molding by taking out the injection molding, which may cause a problem in the molding state of the injection molding.

In addition, the general operation of the injection molding machine for injection molding, in the order of closing the mold, tightening the mold, nozzle touch, injection, cooling, mold opening and ejecting.

In this operation, the quality of the injection molding is cooling.

Therefore, cooling is an important part in injection molding the helical gear 1. The cooling is a process in which a resin (a raw material of an injection product) is plasticized and injected into the cavity, and then the plasticized resin injected into the cavity is solidified to form an injection molded product. This is called curing.

Therefore, cooling is an important requirement in maintaining the precision and production quality of the injection molding. That is, when the process of solidifying the injection molding in the cavity is made at the same speed as possible as a whole, the precision of the injection molding can be improved, and the quality of the injection molding can be maintained.

In particular, in the case of injection molding producing a helical gear made of a plastic material having a plurality of inclined teeth, high precision and production quality of the teeth are required more than other injection moldings.

However, in the related art, since an indirect cooling method of cooling an injection molding through heat exchange between core and gearing is made, it is difficult to uniformly cool the injection molding, and thus, it is difficult to maintain precise production and production quality of the gear.

The present invention provides a method for returning a helical gear by using a guide groove and a return pin, and a helical gear injection molding apparatus having a guide groove and a return pin is rotated when taking out a helical gear formed to solve the above problems. It is an object of the present invention to provide a method and apparatus for producing helical gears of uniform quality by injection molding helical gears under the same conditions by returning the gears to their original positions.

In addition, an object of the present invention is to provide a method and apparatus capable of producing helical gears of precise and uniform quality through uniform cooling by directly cooling gearing for molding plastic helical gears.

The present invention is a solution for achieving the problem to be solved by the present invention as described above,

In the method of returning the gearing of the helical gear injection molding apparatus rotating at a predetermined angle for taking out the injection-molded helical gear,

A guide groove having a force and an inclined surface applied when the mold is closed and a return pin inserted along the inclined surface of the guide groove are used, and either one of the guide groove and the return pin is in contact with the bottom surface of the mold and the gear body. It is formed on the upper surface of the main body of the gear ring constrained to the one mold by the gearing fixing piece, the other is formed on the other mold at a position corresponding thereto, and rotated by a predetermined angle for taking out the helical gear during mold closing of the mold. The gearing is returned to its original position in the process of the return pin is inserted along the inclined surface of the guide groove.

The injection molding apparatus to which the above-described method is applied has a gearing which is rotated at a predetermined angle for taking out the injection-molded helical gear which is constrained to the one mold by a gearing fixing piece by contacting one side of the mold and the lower surface of the gearing body. In the helical gear injection molding apparatus,

A return means comprising a guide groove having an inclined surface and a return pin inserted along the inclined surface of the guide groove, wherein any one of the guide groove and the return pin of the return means is formed on an upper surface of the main body of the gearing; One is characterized in that formed on the other side of the mold corresponding to this.

In addition, the gearing is formed on the lower surface of the gearing main body to form a rotation stop pin for restraining the rotation range of the gearing, the one side mold is characterized in that it has a guide groove for guiding the rotation stop pin.

In addition, the gearing is formed inside the main body of the gearing, the cooling line through which the refrigerant flows; An inlet for injecting a refrigerant into the cooling line; And a discharge port for discharging the refrigerant that is injected into the injection hole and heat-exchanged.

In addition, the guide groove is a conical groove, the return pin is characterized in that the conical shape coinciding with the conical groove.

In addition, the return pin is characterized in that the end is a spherical shape.

Through the technical features of the present invention as described above, the present invention was gearing position during the injection molding of the gearing rotated for ejection of the helical gear using the mold closing force in the process of the return pin is inserted along the inclined surface of the guide groove The effect is to return to position.

This has the effect of maintaining a uniform shape or quality of the helical gear that is the injection molding.

In addition, there is an effect to exhibit the above functions in a relatively easy method and simple structure compared to the prior art.

Furthermore, by forming a cooling line in the gearing body, it is possible to produce a precise helical gear in a uniform form or quality through uniform cooling.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention with respect to one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

4 is a view for explaining the principle according to the method of returning the helical gearing using the guide groove and the return pin of the present invention, Figure 5 is a guide according to the method of returning the helical gearing using the guide groove and the return pin of the present invention Figure 6 shows an example of the shape of the groove and the return pin, Figure 6 is a view for explaining an embodiment of the gearing according to the helical gear injection molding apparatus having a guide groove and the return pin of the present invention, Figure 7 is a guide groove and the return pin of the present invention Figure 4 is a view for explaining another embodiment of the gearing according to the helical gear injection molding apparatus having a.

As shown in FIG. 4, the present invention is characterized in that the gears rotated for ejection of the helical gear are correctly returned to their original positions by using guide grooves having inclined surfaces and return pins inserted along the inclined surfaces. .

Conceptually explaining the principle of such technical features, as shown in Figure 4, the guide groove 20 has a predetermined inclined surface, the return pin 30 is inserted along the inclined surface of the guide groove guide It has a structure inserted into 20.

Through this structure, the force acts in one direction as shown in FIG. 4 (c), and the guide groove 20 is actuated by the force upward as shown in FIG. When moving upward, as shown in FIG. 4 (e), the return pin 30 is inserted along the inclined surface of the guide groove 20, and the force acts in the other direction. In the same state as the guide groove 20 is returned to its original position.

This, the shape of the guide groove 20 is preferably a conical groove so that the inclined surface is formed as shown in FIG. 4, the shape of the return pin 30 has a conical shape that is matched to the groove of the conical shape It is preferable.

However, the shape of the guide groove 20 and the return pin 30 is not limited to the shape shown in FIG. 4, but various guides having inclined surfaces as shown in the embodiment of FIG. 5 (a). As shown in the embodiment of the groove and 5 (b), the insertion portion may have various shapes such as hemispherical shape or spherical shape to be inserted along the inclined surface of the guide groove.

Therefore, the method of restoring the helical gearing by using the guide groove and the return pin of the present invention is a method of restoring the gearing 2 of the helical gear injection molding apparatus that rotates at a predetermined angle for taking out the injection-molded helical gear. ,

 A guide groove 20 having an inclined surface and a return pin 30 inserted along the inclined surface of the guide groove 20 are used, and any one of the guide groove 20 and the return pin 30 is formed on one side of the mold and When the lower surface of the gearing body is in contact with the lower surface of the main body of the gearing (2) bound to the one mold by the gearing fixing piece (3), the other is formed on the other side of the mold corresponding to the mold, For example, the gearing 2 rotated by a predetermined angle for taking out the helical gear 1 is returned to its original position in the process of inserting the return pin 30 along the inclined surface of the guide groove 20. It is characteristic.

4, the return pin 30 is formed in the stationary mold, and the guide groove 20 is formed in the gearing 2.

Thereby, using the force applied at the time of mold closing, the return pin 30 is inserted along the inclined surface of the guide groove 20 of the rotated gear ring 2, and in this process, the gearing 2 is returned to its original position. Is returned.

Through this structure, the return process of the gearing (2) is in the mating state (a), the mold opening state (b), the gearing rotation state (c), the mold closing process state (d), the gearing return process state (e) and the mold Through the mold closing completion and the gearing return completion state (a).

As shown in FIG. 4 (a), the mold is closed and the injection molding of the helical gear is performed by the gearing 2 fixed by the coupling of the guide groove 20 and the return pin 30 to inject the helical gear. It corresponds to the position, that is, the original position.

When the injection molding of the helical gear is completed in such a state, the mold is opened for taking out the injection molded product, and this state is illustrated in FIG.

That is, in the state where the mold is opened, the guide groove 20 and the return pin 30 are positioned and separated on the same line.

Subsequently, when the helical gear is taken out by the force applied by the ejecting means such as the ejector as shown in FIG. 4 (c), the gearing 2 is rotated by a predetermined angle for taking out the ejecting process of the helical gear.

At this time, the rotation range of the gearing (2) is made within the range that can be inserted into the return pin 30 in the guide groove (20).

In this way, when the ejection is completed, the movement starts to mold the mold, and when the return pin 30 comes into contact with the inclined surface of the guide groove 20 as shown in FIG. 4 (d), the return of the gearing 2 is started from this time. Begins. Afterwards, as the return pin 30 is inserted along the inclined surface of the guide groove 20 as shown in FIG. 4 (e), the gearing 2 rotates in a direction opposite to the direction in which the helical gear is rotated for extraction. When insertion of the return pin 30 is completed as shown in FIG. 4 (a), the gearing 2 is positioned before the gearing 2 rotates to take out the helical gear, that is, when the helical gear is formed. Return to the position of exactly.

Hereinafter, a helical gear injection molding apparatus having a guide groove and a return pin of the present invention will be described.

In the injection molding apparatus to which the above method is applied, as shown in FIG. 6, the one side mold 100 and the lower surface of the gearing main body are in contact with each other, and the helical gear is injection-molded by the gearing fixing piece. In the helical gear injection molding apparatus 10 having a gearing 2 rotating at a predetermined angle for ejection of

And a return means consisting of a guide groove 20 having an inclined surface and a return pin 30 inserted along the inclined surface of the guide groove.

At this time, any one of the guide groove 20 and the return pin 30 of the return means is formed on the upper surface of the main body of the gearing 2, the other is formed on the other side mold 200 of the corresponding position It is done.

That is, when the guide groove 20 is formed in the gearing 2, the return pin 30 is formed in the other mold 200, and conversely, when the return pin 30 is formed in the gearing 2, the other mold 200 is formed. In the guide groove 20 is formed.

In addition, the return means consisting of the guide groove 20 and the return pin 30 as described above may be one as shown in FIG. 4, may be two as shown in FIG. As such, the number of return means can be determined by the user as needed.

In addition, the gearing (2) is formed on the lower surface of the gearing body, the rotation stop pin 40 for restraining the rotation range of the gearing (2), the one side mold 100 is the rotation stop pin 40 is inserted It characterized in that it has a guide groove 50 for guiding the rotation stop pin 40 to the groove of the structure that can be.

This is for limiting the section in which the gearing 2 is rotated for taking out the helical gear, thereby limiting the rotatable section of the gearing 2 so that the return of the gearing 2 by the return means can be made accurately.

In particular, a section in which the gearing 2 can be returned by the return means by defining a rotatable section so that the gearing 2 can be rotated only within the range in which the return pin 30 can be inserted into the guide groove 20. Eliminate problems that can escape the problem.

In addition, as shown in FIG. 7, the gearing 2 according to the present invention is formed inside the main body of the gearing and is connected to a mold cooling line through which the refrigerant 110 introduced for cooling the mold 100 flows. It further includes an inlet 61 for injecting the refrigerant 110 into the line 60 and the cooling line 60 and an outlet 62 for discharging the refrigerant heat-exchanged into the inlet 61 and heat-exchanged. It is done.

That is, as shown in FIG. 7, the gearing 2 has a cooling line 60 connected to a mold cooling line pre-installed in one mold 100 constrained by the gearing fixing piece 3 of the gearing 2. It is formed in the main body so that the coolant 110 is directly cooled while circulating in the gearing 2 main body to achieve uniform cooling in injection molding the helical gear.

Specifically, as shown in the gearing 2 longitudinal section of FIG. 7, a cooling line 60 through which the coolant 110 may flow is formed inside the main body of the gearing 2, and the coolant is formed in the cooling line 60. An injection hole 61 for injecting 110 and an injection hole 62 for discharging the refrigerant 110 heat-exchanged by being injected into the injection hole 61 are formed.

Such a cooling line 60 may be formed by connecting a plurality of straight holes as shown in FIG. 7, but is not limited thereto and may have various structures capable of performing heat exchange by circulating inside the main body.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And such variations and modifications are intended to fall within the scope of the appended claims.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be interpreted.

1 is a view for explaining an injection molding apparatus for molding a helical gear;

Figure 2 is a view showing one side mold of the helical gear injection molding apparatus,

3 is a view for explaining the rotation of the gearing,

4 is a view for explaining the principle according to the method for returning the helical gearing using the guide groove and the return pin of the present invention;

5 is a view showing a shape example of the guide groove and the return pin according to the method for returning the helical gearing using the guide groove and the return pin of the present invention;

6 is a view for explaining an embodiment of the gearing according to the helical gear injection molding apparatus having a guide groove and a return pin of the present invention;

7 is a view for explaining another embodiment of the gearing according to the helical gear injection molding apparatus having a guide groove and the return pin of the present invention.

Description of the Related Art

1: helical gear

2: gearing

3: gearing fixing piece

10: Helical Gear Injection Molding Device

20: Information Home

30: return pin

40: rotation stop pin

50: guide groove

60: cooling line

61: inlet

62 outlet

100: one side mold

110: refrigerant

200: other side mold

Claims (6)

delete In the helical gear injection molding apparatus having one side mold and the lower surface of the gearing main body is contacted and restrained by the gearing fixing piece to the one side mold, and has gearing rotating at an angle for taking out the injection-molded helical gear. And a return means including a guide groove having an inclined surface and a return pin inserted along the inclined surface of the guide groove. One of the guide groove and the return pin of the return means is formed on the upper surface of the main body of the gearing, the other is formed in the other side of the mold in the corresponding position ; The gearing has a rotation stop pin that restrains the rotation range of the gearing on the lower surface of the gear body, the one side mold has a guide groove for guiding the rotation stop pin; guide groove and return pin Having a helical gear injection molding device. delete The method of claim 2, wherein the gearing Cooling line is formed inside the main body of the gearing, the refrigerant flows; An inlet for injecting a refrigerant into the cooling line; And A helical gear injection molding apparatus having a guide groove and a return pin further comprising a discharge port for discharging the refrigerant heat-exchanged into the injection hole. The method according to claim 2 or 4, The guide groove is a conical groove, and the return pin is a conical shape coinciding with the conical groove; Helical gear injection molding apparatus having a guide groove and a return pin. The method according to claim 2 or 4, Helical gear injection molding apparatus having a guide groove and the return pin, characterized in that the return pin has a spherical shape.

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