KR102177891B1 - Apparatus with innjection mold for air intake hose - Google Patents

Abstract

In an injection apparatus comprising an injection mold and a metering line for forming an intake hose, according to the injection mold for the intake hose and a method for manufacturing the intake hose using the same according to an embodiment of the present invention, the efficiency and yield of injection molding are increased, and it is possible to easily take out the intake hose completed with molding from a main core without damaging a product.

Description

Injection device for intake hose {Apparatus with innjection mold for air intake hose}

The present invention relates to an injection device including an injection mold for an intake hose and a metering line.

Fuel and air are required to operate the engine, which is the power source for driving the vehicle, and cold air (new air) required by the engine is supplied to the engine from the outside of the vehicle through an intake system. Here, the intake system applies an intake hose connecting the air filter and the engine so as to filter foreign substances such as dust or sand contained in the air introduced from the outside of the vehicle and to insulate the vibration generated from the engine. do.

The material of the intake hose applied to the intake system of the engine is usually rubber, thermoplastic elastomer (TPE), and among them, thermoplastic elastomer (hereinafter referred to as'TPE') is lighter in weight compared to rubber. It is used a lot because it has the advantage of excellent durability.

These TPE intake hoses are manufactured by injection molding, and the conventional injection mold used in injection molding is configured separately to form the outer shape of the intake hose, so that the upper and lower molds form cavities inside when combined with each other. And, a main core disposed in the cavity between the upper and lower molds to form the inner mold of the intake hose.

The injection mold constructed in this way is to mold the intake hose by injecting the molten TPE material through an injection machine that receives the molten raw material and injects it. When the molding is completed, the upper and lower molds are separated, and the upper and lower molds are separated. The main core is separated from the cavity. After that, the operator takes out the molded intake hose from the main core on the outer peripheral surface of the main core.

In the conventional injection mold for intake hose, it is unfair for an operator to forcibly take out the finished intake hose product from the main core through a number of work processes as described above after the molding of the intake hose is completed. Korean Patent Laid-Open Publication No. 10-2012- Even in the case of a method of supplying air from the inside as in No. 0000411, it is difficult to remove the intake hose smoothly under a practical working environment and there is a concern that quality problems may occur.

The present invention provides an injection mold for an intake hose that is easier to take out of a molded intake hose from a main core after injection molding is completed and can be made without damage to a product.

In an injection apparatus comprising an injection mold and a metering line forming an intake hose, the injection apparatus according to the present invention comprises: a lower mold receiving part; The upper mold receiving part is provided on the lower mold receiving part to form a mold receiving space inside, and a first raw material input port through which the material is injected through the mold receiving space is formed; A first main core accommodated in the mold receiving space to form at least a portion of an inner mold including a bellows portion of the intake hose; It is accommodated in the mold receiving space and is coupled to the first main core, forms an inner mold of the intake hose, and when combined, an air discharge port for discharging air supplied from the outside to the contact surface with the first main core is formed. 2 main core; A first pair of side molds provided on both side surfaces to surround at least a portion of the first main core and the second main core, and coupled to each other to form an outer mold of the intake hose; A second pair of side molds provided on both side surfaces to surround the rest of the first and second main cores, and coupled to each other to form an outer mold of the intake hose; First mold moving means provided outside each of the first pair of side molds to move the first pair of side molds in a horizontal direction; Second mold moving means provided outside each of the second side mold pairs to move the second side mold pairs in a horizontal direction, respectively; A first main core moving means provided outside the first main core and moving the first main core in a horizontal direction; A second main core moving means provided outside the second main core to move the second main core in a diagonal direction; And a control unit for controlling the injection mold and the metering line to perform injection for forming the intake hose; and

When at least one of the first side mold pair and the second side mold pair are combined to form an inner space, a second material is communicated with the first raw material input port at the top so that the raw material can be injected into the inner space. The raw material input port is formed,

The raw material contains 37% to 58% of EPDM rubber and 42% to 63% of polypropylene,

The control unit sequentially controls the nozzle temperature (NH) and the temperatures (HT 1 to 4) of the heaters in the temperature control zone at 225, 220, 220, 200, and 190 degrees Celsius, respectively, and the injection pressure is the first to the third pressure These are 45, 50, and 42kg/cm ² , respectively, and are controlled with an error range of ±5kg/cm ² .

In addition, the control unit is performed with an injection time of 6 minutes and a cooling time of 60 minutes, but may be controlled to have a time range within an error range of ±5%.

In addition, the controller may sequentially control the back pressure at 4/7/5/3 kg/cm ² for each order.

In addition, the control unit may set the weighing amount to 13 mm and the cushion amount to 12 mm, and control it within an error range of ±5%.

In addition, the second raw material input port may be formed on at least one contact surface of the first side mold pair and the second side mold pair.

In addition, a material receiving groove formed in a groove shape may be formed along at least one contact surface of the first side mold pair and the second side mold pair around the second raw material input port.

According to the injection mold for an intake hose and a method for manufacturing an intake hose using the same according to an embodiment of the present invention, the efficiency and yield of injection molding are increased, and the ejection of the molded intake hose from the main core is easily performed without damage to the product. Can be done.

1 and 2 are perspective and rear perspective views, respectively, of an injection mold for an intake hose according to an embodiment of the present invention.
3 is a plan view of an injection mold for an intake hose of FIG. 1.
4 is an exploded perspective view showing external components of an injection mold for an intake hose according to an embodiment.
5 is an exploded perspective view showing mold-related components of an injection mold for an intake hose according to an embodiment.
6 is a perspective view showing an intake hose manufactured according to an embodiment of the present invention.
7 is a schematic perspective view for explaining components related to movement and coupling of a second mold pair.
8 is a schematic perspective view for explaining components related to movement and coupling of a first side mold.
9 is a schematic perspective view illustrating a moving-related component of a first main core.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Unless there is a specific definition or reference, terms indicating directions used in this description are based on the state indicated in the drawings. In addition, the same reference numerals refer to the same members throughout each embodiment. On the other hand, each component displayed in the drawings may be exaggerated in thickness or dimensions for convenience of description, and does not mean that it should be configured in a ratio between the corresponding dimensions or components.

1. Manufacturing equipment

1 and 2 are a perspective view and a rear perspective view of an injection mold for an intake hose according to an embodiment of the present invention, respectively, and FIG. 3 is a plan view of the injection mold for an intake hose of FIG. 1. In addition, Figure 4 is an exploded perspective view showing external components of the injection mold for an intake hose according to an embodiment.

The injection mold 100 for an intake hose according to an embodiment of the present invention is a support plate 110, a support part 120, and a lower mold receiving part 130 as an external component for forming an outer shape and accommodating a mold therein. , Includes an upper mold receiving portion 140, an upper cover plate 150.

The support plate 110 is fixed to the entire mold apparatus including the injection mold 100 for an intake hose according to the present embodiment to support the load of other components. The support part 120 is fixed on the support plate 110.

The lower mold receiving part 130 and the upper mold receiving part 140 have a certain space formed therein to accommodate a plurality of mold components to be described later. By moving the molds on the four sides of the contact surface of the lower mold receiving part 130 and the upper mold receiving part 140 and combining them in the lower mold receiving part 130 and the upper mold receiving part 140, the raw material for intake hose manufacturing is Components forming a space for injection are exposed to the outside.

The lower mold receiving part 130 is a first main core moving means 270, a second mold moving means 370, 470, and a second main core in four directions (D1, D2, D3, D4) forming a right angle to each other. A groove-shaped space is formed so that the moving means 570 can be exposed to the outside. That is, the first main core moving means 270, the second mold moving means 370, 470, and the second main core moving means 570 are contact surfaces of the lower mold receiving part 130 and the upper mold receiving part 140 It is configured to have a constant length toward the outside from the four sides. The first main core moving means 270, the second mold moving means 370 and 470, and the second main core moving means 570 will be described in detail below.

The upper mold receiving part 140 and the upper cover 150 are formed with first raw material input ports 145 and 155 penetrating the top and bottom. The material for forming the intake hose is injected into the first raw material input ports 145 and 155.

A mold and related components according to an embodiment will be described with reference to FIGS. 5 to 10. 5 is an exploded perspective view showing mold-related components of an injection mold for an intake hose according to an embodiment, and FIG. 6 is a perspective view illustrating an intake hose manufactured according to an embodiment of the present invention. In addition, FIG. 7 is a schematic perspective view for explaining components related to movement and coupling of a second mold pair, and FIG. 8 is a schematic perspective view for explaining components related to movement and coupling of a first side mold. In addition, FIG. 9 is a schematic perspective view illustrating a movement-related component of the first main core, and FIG. 10 is a schematic perspective view illustrating a movement-related component of the second main core.

Referring to FIG. 5, the first main core 600, the second main core 650, the first pair of side molds 700a and 700b, and the second pair of side molds 800a and 800b are the lower molds described above. It is accommodated in the mold receiving space formed between the receiving portion and the upper mold receiving portion to form a space for forming the intake hose 900 shown in FIG. 6 through injection.

The first main core 600 is a component for forming at least a portion of the inner mold 601 including the bellows portion 901 of the intake hose. That is, the first main core 600 forms a certain space between the first side mold pair 700 to form at least a portion of the bellows portion 901 and the rest of the intake hose.

The second main core 650 is combined with the first main core 600 to form an inner mold of the rest of the intake hose. The second main core 650 is formed with an air discharge port 659 for discharging air supplied from the outside on a contact surface with the first main core 600. An air inlet 658 for introducing air from the outside is formed on the other side of the main body 651 of the second main core 650, and the air inlet 658 and the air outlet 659 are flow paths formed in the main body 651 It is communicated through (not shown).

The first side mold pair 700 is provided on both side surfaces to surround at least a portion of the first main core 600 and the second main core 650, and are coupled to each other to form an outer mold of the intake hose. That is, the first pair of side molds 700 functions as a mold for forming at least a portion of the outer shape including the bellows portion 901 of the intake hose.

The second side mold pair 800 is provided on both sides to surround the remaining part of the first main core 600 and the second main core 650, and are coupled to each other to form an outer mold of the intake hose. That is, the second pair of side molds 800 are coupled to each other to form an outer shape of at least a part of the rest of the intake hose except for the bellows.

Referring to FIG. 5, at least one of the first side mold pair 700 and the second side mold pair 800 communicates with the first raw material inlet at an upper portion, so that the raw material can be injected into the inner space. A second raw material input port 808 is formed so that it is. A semicircular groove is formed on the top of the first side molds 700a and 700b, respectively, and when the first side molds 700a and 700b contact each other, the semicircular grooves are combined to form a second raw material input port. Form 808.

In addition, raw material receiving grooves 807 and 707 are formed along the upper part of the contact surface of at least one of the first side mold pair 700 and the second side mold pair 800 around the second raw material input port 808. The raw material receiving grooves 807 and 707 form grooves in the horizontal direction around the second raw material input port 808, so that when the raw material is injected through the first raw material input port described above, the injected raw material is prevented from leaking to the outside as much as possible. It serves to gather toward the second raw material input port 808.

Referring to FIG. 7, the second mold moving means 370 is provided outside each of the second side mold pairs 800 to move the second side mold pairs in the outer horizontal direction, respectively. For convenience of explanation, a description of the second mold moving means 470 on the other side will be omitted.

The second mold moving means 370 includes a first cylinder part 371, a cylinder arm 372, and a coupling part 391. The first cylinder part 371 functions to transmit a force in the horizontal direction by pushing or pulling the cylinder arm 372. At the end of the cylinder arm 372, a coupling portion 391 is formed. The coupling portion 391 is fixedly coupled to the first coupling groove 891 formed in the second side molds 800a and 800b.

Referring to FIG. 8, the first mold moving means is provided outside each of the first side mold pairs 700 to move the first side mold pairs 700 in the horizontal direction, respectively.

The first mold moving means includes a first mold guide part 708, a guide rod 709, and an external force providing part (not shown). The first mold guide portion 708 is fixed to the lower mold receiving portion described above, and a guide groove 7081 having a length along the moving direction of the first side mold 700 is formed. The guide rod 709 is formed in a rod shape having a predetermined length, and penetrates through the guide groove 7081 of the first mold guide part 708 while being fixed to the upper mold receiving part 140 (see FIG. 2) described above. It is equipped. The guide rod 709 serves as a guide through which the first side mold pair 700 moves. That is, when the first side mold pair 700 receives a force in the transverse direction, the first side mold pair 700 moves diagonally along the guide rod 709. The first side mold 700 has a guide rod receiving hole 707 in which the end of the guide rod 709 is received and fixed.

Referring to FIG. 9, the first main core 600 moves in the horizontal direction by the first main core moving means 270. The detailed configuration of the first main core moving means 270 is substantially the same as the operating method of the first mold moving means shown in FIG. 8 described above.

The second cylinder 271 provides a moving force in the horizontal direction, and the coupling portion 291 provided at the end of the cylinder arm 272 is formed in the coupling groove 281 formed in the first main core coupling portion 280. Combine harmoniously. The first main core 600 moves in the horizontal direction according to the operation of the second cylinder 271 while being coupled to the first main core coupling portion 280.

Referring to FIG. 10, the second main core moving means 570 is provided outside the second main core 650 to move the second main core. The second main core moving means 570 pushes up the second main core 650 in an oblique direction or lowers while pulling the second main core 650. Specifically, the second main core moving means 570 includes a fourth cylinder portion 571. The fourth cylinder part 571 provides a force in the horizontal direction, and the coupling part 591 provided at the end of the cylinder arm 572 is suitable for the coupling groove 581 of the fourth cylinder part coupling part 580. Combine with The fourth cylinder part coupling part 580 is connected to the fourth cylinder part 570 in this way and moves in the horizontal direction. Meanwhile, a guide bevel 583 having an inclined shape is formed in the fourth cylinder part coupling part 580 toward the second main core 650. The inclined surface engaging portion 587 of the second main core engaging portion 585 is coupled to the guide inclined surface 583. Due to this structure, when the fourth cylinder coupling part 580 moves toward the second main core 650, the second main core coupling part 585 moves toward the second main core 650 and is pushed upward at the same time. On the contrary, when the fourth cylinder coupling part 580 moves to the opposite side of the second main core 650, the second main core coupling part 585 moves to the opposite side of the second main core 650 and descends at the same time. do.

2. Injection material

The raw material injected into the injection mold for an intake hose having such a structure has the following composition.

Specifically, TPE (Thermo Plastic Elastomer), that is, a thermoplastic elastomer is injected into the injection mold for the intake hose, and the main components are PP (poly propylene) and EPDM (ethylene propylene diene monomer).

EPDM (Ethylene Propylene Diene Terpolymer) is a terpolymer in which Ethylene, Propylene, and Diene are irregularly combined. EPDM has strong resistance to heat, light, ozone, etc. because there is no double bond (the binding energy is smaller than a single bond) in the main chain, and it hardly deteriorates due to excellent heat resistance and weather resistance.

The injection raw material according to this embodiment is formed of 37% to 58% of EPDM rubber and 42% to 63% of polypropylene.

When EDPM rubber is contained in less than 37%, the workability decreases, making it difficult to take out, and at the same time, heat resistance is reduced, and there is a risk of deformation at the connection part with the automobile engine. In addition, when the EDPM rubber is contained in an amount exceeding 58%, it is easy to take out, but there is a problem that the shape retention is poor. In other words, it is possible to minimize thermal deformation and improve take-out workability while simultaneously satisfying the range of 37% to 58% of EPDM rubber and 42% to 63% of polypropylene, while ensuring the shape of the hose. That is, polypropylene is necessary for maintaining the shape of a product, but if it is included excessively, the hardness increases more than necessary, resulting in deterioration in processability and product characteristics.

In the method of manufacturing an intake hose by dividing each part of the intake hose and forming it with each material and then combining the manufactured parts to manufacture the intake hose, it is possible to manufacture the characteristics of each part differently, but injection molding the intake hose as an integral type In this case, it becomes difficult to select an appropriate injection material. However, in the case of forming the intake hose in the range of 37% to 58% of EPDM rubber and 42% to 63% of polypropylene at the same time as in the present embodiment, all the necessities of each part can be satisfied.

That is, in forming the intake hose using the injection mold and the injection device according to the present invention only when injection raw materials having the above composition range are used, it is easy to separate the intake hose according to the injection of air and maintain the injection quality, It is possible to maintain the original shape of the product during injection.

3. Manufacturing process (control of injection conditions)

Table 1 below is a table explaining the injection conditions. Thermal resin temperature, injection speed, pressure, cooling time, etc. are important factors in the injection operation process and conditions according to this embodiment, and all the injection molds and metering (back pressure) lines described above are provided by a separate control unit (not shown). The injection process is performed by controlling the included injection device.

<Table 1>

Table 1 is a table showing the heater temperature among the injection conditions applied to the injection process. As shown in Table 1, the nozzle temperature (NH) and the temperature of the heaters in the temperature control zone (HT 1 to 4) are sequentially performed at 225, 220, 220, 200, 190 degrees Celsius (error range ± 5 degrees Celsius), respectively. do.

<Table 2>

Table 2 is a table of injection conditions showing injection pressure, speed and injection position.

Injection speed refers to the amount of injection molding material per unit time, and in setting the injection speed, it should be considered to suit the type of resin and the shape of the molded product. As the melt viscosity decreases when the injection speed is slowed down, it is possible to not completely fill the cavity of the mold (short shot), flow marks, severe weld line, and poor surface gloss. Can be

<Table 3>

Table 3 is a table showing other injection conditions, showing injection time and cooling time (preferably less than ±5% error), back pressure, metering and cushioning.

Back pressure is the pressure that blocks in the reverse direction, and the higher the pressure, the higher the density of the injection product, and it is realized as 4/7/5/3 (kg/cm ² ) by order. When the back pressure is low, the amount of cushioning is an amount that is elastically added to compensate for the deficit. If it is small, the filling is not stable due to the deviation of the weighing, and if it is large, the residence time increases and the physical properties of the resin change and the pressure transfer is delayed, making it difficult to control. Lose. It is preferable that the above injection conditions have an error range of less than ±5% in consideration of mechanical differences and tolerances, respectively.

These injection conditions are conditions for maintaining the quality of the final product when an injection operation is performed by injecting an injection material having a specific composition ratio into the injection mold and apparatus described above.

Although the preferred embodiment of the present invention has been described above, the technical idea of the present invention is not limited to the above-described preferred embodiment, and may be variously implemented within the scope not departing from the technical idea of the present invention embodied in the claims. have.

600: first main core
650: the second main core
700: first side mold pair
700a, 700b: first side mold
800: second side mold pair
800a, 800b: second side mold
707, 807: raw material receiving groove
808: second raw material input port

Claims (6)

In an injection device comprising an injection mold and a metering line forming an intake hose,
Lower mold receiving part;
The upper mold receiving part is provided on the lower mold receiving part to form a mold receiving space inside, and a first raw material input port through which the material is injected through the mold receiving space is formed;
A first main core accommodated in the mold receiving space to form at least a portion of an inner mold including a bellows portion of the intake hose;
It is accommodated in the mold receiving space and is coupled to the first main core, forms an inner mold of the intake hose, and when combined, an air discharge port for discharging air supplied from the outside to the contact surface with the first main core is formed. 2 main core;
A first pair of side molds provided on both side surfaces to surround at least a portion of the first main core and the second main core, and coupled to each other to form an outer mold of the intake hose;
A second pair of side molds provided on both side surfaces to surround the rest of the first and second main cores, and coupled to each other to form an outer mold of the intake hose;
First mold moving means provided outside each of the first pair of side molds to move the first pair of side molds in a horizontal direction;
Second mold moving means provided outside each of the second side mold pairs to move the second side mold pairs in a horizontal direction, respectively;
A first main core moving means provided outside the first main core and moving the first main core in a horizontal direction;
A second main core moving means provided outside the second main core to move the second main core in a diagonal direction; And
Including; a control unit for controlling the injection mold and the metering line to perform injection for forming the intake hose,
When at least one of the first side mold pair and the second side mold pair are combined to form an inner space, a second material is communicated with the first raw material input port at the top so that the raw material can be injected into the inner space. The raw material input port is formed,
The raw material contains 37% to 58% of ethylene propylene diene monomer (EPDM) rubber and 42% to 63% of polypropylene,
The control unit controls the temperature of the nozzle and the temperature control zone, controls the injection pressure,
The second main core moving means,
A fourth cylinder portion providing a horizontal movement force;
A fourth cylinder part coupling part coupled to the fourth cylinder part and moving in a horizontal direction and having an inclined surface formed toward the second main core; And
Combined with the second main core, when the fourth cylinder part is moved toward the second main core side by combining with the inclined surface of the fourth cylinder part coupling part, it rises and the fourth cylinder part moves to the opposite side of the second main core. Injection device for an intake hose comprising a; a second main core coupling portion that descends when letting . The method of claim 1,
The control unit performs an injection time of 6 minutes and a cooling time of 60 minutes, but an injection device for an intake hose that controls to have a time range within an error range of ±5%. delete The method of claim 1,
The control unit is an injection device for an intake hose that controls a weighing amount of 13 mm and a cushion amount of 12 mm, and within an error range of ±5%. The method of claim 1,
The second raw material injection port is an injection device for an intake hose formed on at least one contact surface of the first side mold pair and the second side mold pair. delete

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