KR101958108B1 - O-ring forming mold and o-ring formed by thereof - Google Patents

Abstract

The present invention relates to an O-ring forming mold and a formed article using the same. More specifically, for the purposes of simplifying manufacturing processes using an injection molding process, and minimizing defect rates of O-ring products while increasing the quality thereof, an O-ring forming mold (100) comprises: a lower mold (110) and an upper mold (120) configured to come in surface contact with each other at a parting line (PL); an O-ring forming space (130) formed at the parting line; an auxiliary material forming space (140) formed on an inner edge and an outer edge of the O-ring forming space; and a material injection path (150) into which an O-ring forming material is injected, wherein the material injection path (150) is connected to the auxiliary material forming space (140), and the O-ring forming material passes through the auxiliary material forming space (140) and through a gate (160) between the O-ring forming space (130) and the auxiliary material forming space (140) to fill the O-ring forming space (130). Accordingly, the O-ring forming mold (100) has the gate (160) positioned on the parting line (PL) around an entire edge of the O-ring forming space.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an O-ring forming mold and an O-ring forming mold,

The present invention relates to an O-ring molding mold for maintaining the airtightness between parts, and more particularly, to an O-ring forming mold which can simplify the manufacturing process, minimize the defect rate and improve the quality while using the injection molding process, The present invention relates to a molded article formed by molding.

In general, O-rings are used as a means for preventing leakage of a moving fluid or maintaining sealing or airtightness in a fuel system, a lubricating system, a cooling system, an intake system, etc. of various devices. O- The elastic body is formed in a circular shape and is made of a rubber or a silicone material so as to have constant elasticity.

The manufacturing process of the O-ring can be classified into the compression method as shown in FIG. 1 and the injection method as shown in FIG. FIG. 1 is a sectional view of an O-ring forming mold using a conventional pressing method, and FIG. 2 is a sectional view of an O-ring forming mold using a conventional injection method.

1, an O-ring forming space 13 is formed in a parting line PL, which is an interface between the lower die 11 and the upper die 12, And an auxiliary molding space 14 is formed on the outer side of the auxiliary molding space 14. The auxiliary molding space 14 is formed by molding an auxiliary material separated from the O-ring after the molded product is manufactured using the O-

That is, during molding for the mold 10, burrs leaked from the parting line PL occur depending on various conditions such as the molding environment and the degree of mold deterioration, and it is difficult to finish the burrs The occurrence of burrs must be minimized in consideration of the fact that the o-rings must maintain the airtightness in use, and a considerable degree of precision is required in the burr operation.

Therefore, an auxiliary molding space 14 is formed in a parting line PL located inside and outside of the O-ring so as to form an auxiliary member together with the O-ring. At this time, the thickness of the connecting portion between the O-ring and the auxiliary member is made very thin, Separation or separation using a cutter can eliminate the occurrence of burrs, and precise finishing operations can be omitted.

As an example of the compression molding method as shown in Fig. 1, Korean Utility Model Registration No. 20-0184032 (Patent Document 1) comprises a pair of molds pressed against each other, and a plurality of O-ring forming grooves are formed on the opposite surfaces of the mold Wherein an O-ring forming groove is formed in the inner and outer peripheries of the O-ring forming groove, and a cut-away forming portion is formed between the cut-in reinforcing portion forming groove and the O-ring forming groove, An O-ring forming apparatus has been proposed in which a recessed protrusion forming groove having a considerable depth is formed in the cut-away reinforcing portion forming groove.

However, since the quality of the O-ring depends on the amount of the material to be introduced into the O-ring forming groove before molding, it is necessary to measure the amount of the injection accurately, and in a state in which the upper mold and the lower mold are opened There is a problem in that productivity is poor due to complicated operations such as molding, closing, and then opening the mold again and taking out the molded product.

In order to solve such a problem of the compression molding method, a newly proposed method is an injection molding method as shown in FIG.

FIG. 2 is a cross-sectional view showing a mold structure for another type of O-ring molding. The O-ring forming space 13 is formed in a parting line PL, which is an interface between the lower mold 11 and the upper mold 12, An auxiliary injection molding space 14 is formed on the inner side and the outer side of the space 13 and a material injection path 15 through which the molten material for forming the O-ring is inserted is formed on one side of the O- A gate 16 is formed between the injection path 15 and the O-ring forming space 13.

As an example of the injection molding method as shown in FIG. 2, Korean Patent Registration No. 10-0736770 (Patent Document 2) selects TPU (Thermoplastic Polyurethane) as an injection material; In molding the part, the parting mold is composed of the upper mold, the lower mold, and the side mold. In designing the parting line where the mold is in contact, a parting line is formed at the center of the inner surface of the O-ring And a parting line is formed in the upper and lower portions thereof so that the upper mold and the lower mold are in contact with each other. The one side mold is configured to be slidable laterally, and the resin A method of manufacturing an O-ring by injection formed by injecting a solution into an inside of a mold or from an outer surface of the O-ring to an upper portion or a lower portion of the O-ring is proposed.

In this injection molding method, since the material is injected at a high pressure through the material injection passage 15 in a state where the lower mold 11 and the upper mold 12 are closed, the O-ring molding process is performed in comparison with the compression molding method shown in FIG. It is a method that simplifies work and improves productivity.

However, in the injection molding method, a protrusion is formed in a portion of the surface of the O-ring after the molding where the gate 16 is located, and a work for mapping the protrusion is necessarily required, If the finishing operation is not precise, there is a possibility that the airtightness is poor due to the projecting portion, so that the defective rate of the product is reduced and high quality can not be achieved.

1. Korean Utility Model Registration No. 20-0184032 (Notice of June 1, 2000) 2. Korean Patent Registration No. 10-0736770 (2007.7.9 Announcement)

The present invention is to solve the problem of the O-ring forming method embraced by the above-mentioned prior arts, and it is an object of the present invention to provide an O-ring forming method capable of simultaneously achieving simplification of a manufacturing process, minimization of a defect rate of an O- A mold and a molded product formed thereby.

According to an aspect of the present invention, there is provided an O-

A lower mold and an upper mold which are mutually interviewed by a parting line;

An o-ring forming space formed in the parting line;

An auxiliary molding space formed around an inner circumference and an outer circumference of the O-ring forming space;

A material injection path through which the O-ring forming material is injected; Wherein the injection mold comprises:

Wherein the material injection path is connected to the auxiliary molding space,

And the gate is formed on a parting line around the entire o-ring forming space by allowing the O-ring forming material to fill the O-ring forming space through the gate between the O-ring forming space and the auxiliary forming space via the auxiliary- do.

The molded article molded by such an O-ring forming mold is,

An O-ring formed by an O-ring forming space located on the parting line of the O-ring forming mold;

An inner auxiliary formed by the auxiliary molding space located on the inner periphery of the O-ring forming space;

An outer auxiliary formed by the auxiliary molding space located around the outer periphery of the O-ring forming space;

An inner cutting portion formed between the O-ring and the inner auxiliary;

An outer cutting portion formed between the O-ring and the outer auxiliary; Lt; / RTI >

The O-ring forming material is filled into the O-ring forming space through the gate between the O-ring forming space and the auxiliary forming space via the auxiliary molding space so that the inner cutting portion and the outer cutting portion are formed by the gate positioned on the parting line of the O- .

According to the present invention, it is possible to eliminate the work of forming the gate portion because no mark or protrusion due to the gate is formed on the surface of the O-ring while using the injection molding process, thereby reducing the number of process steps, .

Furthermore, since all the surfaces of the O-ring except the parting line are formed by the molding cavity of the pure mold, the airtightness can be greatly increased, and the quality of the O-ring can be maintained to a certain level, thereby producing high quality O-rings.

1 is a sectional view of an O-ring forming mold using a conventional compression bonding method.
2 is a sectional view of an O-ring forming mold using a conventional injection method.
3 is a sectional view of an O-ring forming mold according to the first embodiment of the present invention.
4 is a sectional view of an O-ring forming mold according to a second embodiment of the present invention;
5 is a sectional view of a molded article molded by an O-ring forming mold according to the present invention.
Fig. 6 is a process (cutting) process of the molded product of Fig. 5; Fig.
7 is an O-ring sectional view formed by the cutting process of Fig.

The present invention may be modified in various ways, and various embodiments may be used. Hereinafter, the present invention will be described in detail with reference to the structures of preferred embodiments of the present invention with reference to FIGS. 3 to 7. It should be understood, however, that there is no intention to limit the invention to the form just described, and the spirit and scope of the present invention encompasses the ordinary variations, equivalents, and alternatives of the illustrated forms.

In the following description, when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, It should be understood that it may exist. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it means that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

3 is a sectional view of the O-ring forming mold according to the first embodiment of the present invention, and FIG. 4 is a sectional view of the O-ring forming mold according to the second embodiment of the present invention.

3 and 4, the O-ring forming mold 100 includes a fixed-side lower mold 110 and a moving-side upper mold 120, and is provided between the lower mold 110 and the upper mold 120 A parting line PL in which the upper mold 120 and the lower mold 110 are in contact with each other is formed.

The parting line PL is provided with an O-ring forming space 130 and the auxiliary molding space 140 is provided around the inner and outer peripheries of the O-ring forming space 130, respectively.

A feature of the present invention is that a material injection path 150 into which a liquid material for forming an O-ring is injected is connected to the auxiliary molding space 140.

In this case, the O-ring forming material may be filled into the O-ring forming space 130 through the gate 160 positioned between the O-ring forming space 130 and the auxiliary forming space 140 via the auxiliary material forming space 140.

For example, as shown in FIG. 3, the material injection path 150 is connected to the auxiliary molding space 140 located at the inner periphery of the O-ring forming space 130, so that the material flows into the gate 160 around the inner periphery of the O- The material injection path 150 is connected to the auxiliary molding space 140 located on the outer periphery of the o-ring molding space 130 as shown in Fig. 4, And may be introduced into the O-ring forming space 130 through the gate 160 on the outer periphery of the molding space 130.

In the plastic injection, a gate mainly refers to an injection port which is injected into a molding space of a final molded product via a sprue and a runner after the material of the molded product is injected, and this gate is formed so that any molded product Located.

The gate 160 is formed on the parting line PL around the entire o-ring forming space 130 so that the o-ring forming space 130 becomes the parting line PL .

A plurality of O-ring forming spaces 130 may be provided for one O-ring forming mold 100. In this case, the material injection passages 150 may be indirectly connected without being directly connected to the auxiliary molding space 140 .

The present invention is characterized in that the parting line PL of the O-ring forming space 130 is used as the gate 160 of the O-ring forming space 130, and the material passes through the auxiliary material forming space 140, It is to be understood that the material injection path 150 in the present invention includes a case where the material injection path 150 is directly connected to the auxiliary molding space 140 or indirectly connected thereto.

FIG. 5 is a sectional view of a molded product molded by an O-ring forming mold according to the present invention, FIG. 6 is a process (cutting) process of the molded product of FIG. 5, and FIG. 7 is an O-ring sectional view formed by the cutting process of FIG.

3 and 5, the molded product 200 injection-molded by the O-ring forming mold 100 described above is inserted into the O-ring forming space 130 (see FIG. 3) located on the parting line PL of the O- An inner auxiliary body 211 formed by an auxiliary molding space 140 located at an inner periphery of the o-ring molding space 130 and an inner auxiliary body 211 formed by an outer circumference of the o-ring molding space 130 And an outer auxiliary member 212 formed by the auxiliary molding space 140.

An inner cutting part 221 is formed between the O-ring 210 and the inner auxiliary part 211 and an outer cutting part 222 is formed between the O-ring 210 and the outer auxiliary part 212.

The O-ring forming material is filled into the O-ring forming space 130 through the gate 160 between the O-ring forming space 130 and the auxiliary molding space 140 via the auxiliary molding space 140, The cutting portion 221 and the outer cutting portion 222 are formed by the gate 160 positioned on the parting line PL of the O-ring forming mold 100, respectively.

Since the inner cutting portion 221 and the outer cutting portion 222 are cut out in a subsequent process, the inner cutting portion 221 and the outer cutting portion 222 are formed into a cuttable thin film state.

The mold 200 can be cut by the cutting mold 300 as shown in FIG. More specifically, the cutting mold 300 includes an inner cover 310 and an outer cutter 320 at the same time. The inner cutter 310 is provided to cut the inner cutting portion 221 of the molded product 200, The outer cutter 320 is provided to cut the outer cutting portion 222 of the molded product 200.

In this case, the inner auxiliary member 211 and the outer auxiliary member 212 of the molded product 200 can be simultaneously separated through a single cutting process of the cutting mold 300, thereby simplifying the work process and improving the productivity.

7, the O-ring 210, in which the inner auxiliary 211 and the outer auxiliary 212 are separated, is a portion of the O-ring 210, Since the gate mark is not formed, the airtightness of the product can be increased, and the product defect rate can be remarkably reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. .

100: O-ring forming mold
110: Lower mold
120: upper mold
130: O-ring forming space
140: auxiliary molding space
150: material injection path
160: Gate
200: Molding material
210: O ring
211: inner aid
212: external aid
221: Inner cutting portion
222: outer cutting portion
300: Cutting mold
310: Inner cutter
320: outer cutter
PL: Parting Line

Claims (4)

A lower mold and an upper mold which are mutually interviewed by a parting line;
An o-ring forming space formed in the parting line;
An auxiliary molding space formed around an inner circumference and an outer circumference of the O-ring forming space;
A material injection path through which the O-ring forming material is injected; Wherein the injection mold comprises:
Wherein the material injection path is connected to the auxiliary molding space,
The O-ring forming material can be filled into the O-ring forming space through the gate between the O-ring forming space and the auxiliary forming space via the auxiliary molding space, so that the gate is positioned on the parting line around the entire O-
Wherein the O-ring forming mold further comprises a cutting mold for cutting auxiliary materials formed inside and outside O-rings and O-rings of the molded product injection-molded by the O-ring forming mold,
The cutting mold includes an inner cutter and an outer cutter for cutting the inner cutting portion and the outer cutting portion formed by the gates between the O-ring forming space and the auxiliary molding space, respectively
Wherein the O-ring and the inner and outer auxiliary members are detachable at the same time through a cutting process of the cutting mold.
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