KR20090016130A - A method for fabricating worm-wheel of reduction gear of steering unit using injection molding - Google Patents

A method for fabricating worm-wheel of reduction gear of steering unit using injection molding Download PDF

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KR20090016130A
KR20090016130A KR1020070080545A KR20070080545A KR20090016130A KR 20090016130 A KR20090016130 A KR 20090016130A KR 1020070080545 A KR1020070080545 A KR 1020070080545A KR 20070080545 A KR20070080545 A KR 20070080545A KR 20090016130 A KR20090016130 A KR 20090016130A
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South Korea
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injection
injection molding
reduction gear
worm wheel
sec
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KR1020070080545A
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Korean (ko)
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KR100911037B1 (en
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윤재일
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주식회사포인트
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/158—Worms and worm wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F11/00—Making worm wheels, e.g. by hobbing

Abstract

A worm wheel manufacturing method for the reduction gear of the steering system using the injection molding is provided that the minimum cooling period required for debubbling is reduced. A worm wheel manufacturing method for the reduction gear of the steering system using the injection molding comprises as follows. Nylon66 resin melting liquid is injected under the condition of injection pressure of 90-110 kg / cm2, injection speed of 13-17 mm / sec, measurement speed of 10-20 mm / sec, molding temperature of the celsius 70-90 drawing, injection time of 30-40 second, weighing place of 110-130mm. The outer circumference is tooth-processed. The injection position in the injection molding is 90mm, 60mm, 40mm, 20mm, 5mm. The raw material is flowed into inside if the raw material is put into through a hopper(1).

Description

사출성형을 이용한 조향장치의 감속기어용 웜휠 제조방법{A Method For Fabricating Worm-wheel of Reduction Gear of Steering Unit Using Injection Molding}Method for Fabricating Worm-wheel of Reduction Gear of Steering Unit Using Injection Molding}

본 발명은 자동차 조향장치에 사용되는 감속기어용 웜휠 제조방법에 관한 것으로서, 보다 상세하게는 사출조건을 정밀하게 제어하여 감속기어용 웜휠의 제조 시 발생되는 기포를 제거함과 아울러 기포 제거에 필요한 최소 냉각 시간을 단축시켜 생산 수율을 현저하게 향상시킬 수 있도록 하는 사출성형을 이용한 감속기어용 웜휠 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a worm wheel for a reduction gear used in an automobile steering apparatus, and more particularly, to precisely control the injection condition to remove bubbles generated during manufacture of the worm wheel for the reduction gear, and to minimize the minimum cooling time required for bubble removal. The present invention relates to a method for manufacturing a worm wheel for a reduction gear using injection molding that can shorten and significantly improve the production yield.

전자식 조향장치는 운전자가 조타 방향을 결정하여 핸들을 회전시키면 토크 센서가 이를 감지하여 감지 토크 신호를 제어유닛인 ECU로 전달하게 되고, ECU는 토크 신호와 차속에 따라 모터를 제어하게 된다.In the electronic steering system, when the driver determines the steering direction and rotates the steering wheel, the torque sensor detects this and transmits the sensed torque signal to the ECU, which is a control unit, and the ECU controls the motor according to the torque signal and the vehicle speed.

모터가 ECU의 제어신호에 의해 회전하면 모터에 연결된 감속기가 모터의 출력 토크를 증폭시키고 감속기에 의해 증폭된 출력토크가 조향장치로 전달되어 차량 의 조향이 이루어지게 된다.When the motor rotates by the control signal of the ECU, the reducer connected to the motor amplifies the output torque of the motor, and the output torque amplified by the reducer is transferred to the steering device to steer the vehicle.

조향장치를 구성하는 상기 감속기는 모터에 연결된 웜기어와 웜기어에 치형결합되는 웜휠로 구성된다. The speed reducer constituting the steering device includes a worm gear connected to a motor and a worm wheel toothed to the worm gear.

도 1에는 종래 웜휠을 제조하는 공정이 도시되어 있다. 1 shows a process for manufacturing a conventional worm wheel.

웜휠은 회전축(미도시)이 결합되는 중공이 형성된 보스(20 : Boss)와 보스의 외주면에 결합되고 웜기어에 대응되는 치가 형성되는 튜브(10)를 포함하여 구성된다.The worm wheel is configured to include a boss (20) having a hollow coupled to the rotating shaft (not shown) and a tube (10) coupled to the outer circumferential surface of the boss and having teeth corresponding to the worm gear.

도 1을 참조하면, 종래 웜휠은 소정 두께로 절단한 후 절단된 보스(20)를 동일한 두께로 절단된 합성수지재의 튜브(10)에 압입하고 접합부를 고주파 융착한 후 튜브(10)의 외주면에 치 형상의 가공하여 제조된다. Referring to Figure 1, the conventional worm wheel is cut to a predetermined thickness and then press the cut boss 20 to the tube 10 of the synthetic resin material cut to the same thickness, and then bonded to the outer peripheral surface of the tube 10 by high-frequency fusion It is manufactured by processing the shape.

그러나, 이러한 종래 웜휠의 제조방법에 의할 경우 제조 공정이 복잡하여 가공비용이 증가되고 가공 시간이 많이 소요되어 생산성이 저하되는 문제점이 있다. However, the conventional manufacturing method of the worm wheel has a problem that the manufacturing process is complicated, the processing cost is increased and the processing time is long, productivity is lowered.

근래에는 종래 압입방식에 의한 문제점을 해결하기 위해 보스(20)를 사출 금형 내에 위치시킨 후 수지 용융액을 사출 금형에 토출시켜 웜휠을 제조함으로써 제조 공정을 감소시키도록 하는 방법이 제안되어 있다.Recently, in order to solve the problems caused by the conventional indentation method, a method of reducing the manufacturing process by placing the boss 20 in the injection mold and discharging the resin melt in the injection mold to manufacture a worm wheel has been proposed.

그러나, 사출 방식에 의해 웜휠을 제조할 경우 기포 발생에 의한 불량율이 증가되는 문제점이 있으며, 기포 발생을 최소화하기 위해 냉각 시간을 길게 하고 있어 여전히 생산성 저하라는 문제점을 내포하고 있다.However, when the worm wheel is manufactured by the injection method, there is a problem in that a defective rate due to bubble generation is increased, and cooling time is increased to minimize bubble generation, and thus still has a problem of lowering productivity.

따라서, 짧은 냉각시간으로 기포 발생을 최소화하면서도 사출성형에 의해 웜휠을 제조할 수 있는 방법에 대한 요구가 높아지고 있는 실정이다.Therefore, there is an increasing demand for a method of manufacturing a worm wheel by injection molding while minimizing bubble generation with a short cooling time.

본 발명은 상기와 같은 문제점을 문제점을 해결하기 위해 안출된 것으로서, 본 발명의 목적은 사출 조건을 정밀하게 제어하여 기포 발생을 최소화할 수 있는 사출성형을 이용한 감속기어용 웜휠 제조방법을 제공하는 것이다.The present invention has been made to solve the above problems, an object of the present invention to provide a method for manufacturing a worm wheel for a reduction gear using injection molding that can minimize the generation of bubbles by precisely controlling the injection conditions.

본 발명의 다른 목적은 정밀한 사출 조건 제어에 의해 빠른 냉각시간에서도 기포 발생이 최소화될 수 있는 방법을 제공하는 것이다.Another object of the present invention is to provide a method in which bubble generation can be minimized even at a fast cooling time by precise injection condition control.

상기와 같은 본 발명의 목적은 나일론66 수지 용융액을 90 ~ 110 kg/Cm2의 사출 압력, 13 ~ 17 mm/sec의 사출 속도, 10 ~ 20 mm/sec의 계량 속도, 70 ~ 90℃의 금형 온도, 30 ~ 40초의 사출시간, 110 ~ 130mm의 계량 위치의 조건하에서 사출한 후 외주면을 치가공하여 이루어지는 것을 특징으로 하는 사출성형을 이용한 조향장치의 감속기어용 웜휠 제조방법에 의해 달성될 수 있다.The object of the present invention as described above is to inject a nylon 66 resin melt 90 ~ 110 kg / Cm 2 injection pressure, 13 ~ 17 mm / sec injection rate, 10 ~ 20 mm / sec weighing speed, 70 ~ 90 ℃ mold It can be achieved by a method for manufacturing a worm wheel for a reduction gear of a steering apparatus using injection molding, characterized in that the injection molding is performed under conditions of temperature, injection time of 30 to 40 seconds, and weighing position of 110 to 130 mm.

상기 사출 성형에서 사출 위치가 90mm, 60mm, 40mm, 20mm 및 5mm인 것이 바람직하다.In the injection molding, the injection positions are preferably 90 mm, 60 mm, 40 mm, 20 mm and 5 mm.

또한, 상기 각 사출 위치에서 가열 실린더의 온도는 각각 275℃, 265℃, 260℃, 255℃, 250℃인 것이 보다 바람직하다.Further, it is more preferable that the temperatures of the heating cylinders at the respective injection positions are 275 ° C, 265 ° C, 260 ° C, 255 ° C and 250 ° C, respectively.

또한, 금형에 토출된 용융액은 90 ~ 110초의 냉각 시간을 갖는 것이 가능하 다.In addition, the molten liquid discharged to the mold can have a cooling time of 90 ~ 110 seconds.

상기와 같은 본 발명에 따르면, 사출 조건을 정밀하게 제어하여 기포 발생을 최소화할 수 있는 사출성형을 이용한 감속기어용 웜휠 제조방법을 제공할 수 있는 효과가 있다.According to the present invention as described above, there is an effect that can provide a method for manufacturing a worm wheel for a reduction gear using injection molding that can precisely control the injection conditions to minimize the generation of bubbles.

또한, 사출 조건 제어에 의해 빠른 냉각시간에서도 기포 발생이 최소화될 수 있는 효과가 있다. In addition, there is an effect that the generation of bubbles can be minimized even in a fast cooling time by the injection condition control.

이하에서는 첨부된 도면을 참조하여 본 발명의 바람직한 일 실시예를 상세하게 설명하기로 한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

우선, 본 발명의 이해를 돕기 위해 도 2를 참조하여 사출성형기의 동작 원리를 간단하게 설명하기로 한다.First, the operation principle of the injection molding machine will be briefly described with reference to FIG. 2 to assist in understanding the present invention.

호퍼(1)를 통해 원료가 투입되면 원료는 내부로 유입되고 가열 실린더(4)에 의해 가열되어 용융상태가 된다. 이 때, 피스톤(2)이 회전하면서 전방으로 이동하여 용융액을 금형(6)으로 사출시킨다. 용융액이 금형(6)에 완전히 유입되면 피스톤(2)이 후진하여 다음 원료의 투입을 준비하게 되고, 금형(6)은 두 짝으로 갈라져서 굳은 플라스틱을 꺼내게 된다. When the raw material is introduced through the hopper 1, the raw material is introduced into the inside and heated by the heating cylinder 4 to be in a molten state. At this time, the piston 2 rotates and moves forward to inject the melt into the mold 6. When the melt flows completely into the mold 6, the piston 2 reverses to prepare for input of the next raw material, and the mold 6 is divided into two pairs to take out the hard plastic.

이러한 사출 과정에서는 고온/고압의 사출성형기 내부에서 저온/대기압의 금형(6) 내부로 유입되면서 갑작스런 온도차에 의한 수축으로 기포가 발생되는 경우가 많다. In this injection process, bubbles are often generated due to sudden contraction due to a temperature difference while being introduced into the mold 6 of the low temperature / atmospheric pressure from the inside of the high temperature / high pressure injection molding machine.

그 외에도 사출 압력, 사출 온도, 사출 속도 등에 따라 기포가 발생할 수 있으므로 이러한 조건들을 조절하여 기포가 발생하지 않도록 할 필요성이 있다.In addition, since bubbles may occur according to injection pressure, injection temperature, injection speed, etc., it is necessary to adjust the conditions so that bubbles do not occur.

본원발명에서는 사출 원료로서 아민기(-NH2)를 가진 화합물 중 탄소가 6개인 물질과 6개의 탄소를 가진 산화화합물간의 반응으로 만들어진 나일론66이 사용되었다. 다수의 실험결과 나일론66은 기타 사출성형용 합성수지재와 비교하여 수분 흡수율, 강도, 단가 측면에서 감속기어용 웜휠에 가장 적당한 소재로 판단되었다.In the present invention, nylon 66 made by the reaction between a 6-carbon material and a 6-carbon oxide among the compounds having an amine group (-NH 2 ) was used as the injection material. As a result of numerous experiments, nylon 66 was judged to be the most suitable material for worm wheels for reduction gears in terms of water absorption rate, strength, and cost compared with other injection molding synthetic resin materials.

합성수지를 사용하여 웜휠을 사출성형하는 경우 기포 발생에 의해 불량품이 발생할 가능성이 높아 일반적으로 냉각시간을 길게 하여 기포를 제거하고 있다.When injection molding a worm wheel using a synthetic resin, defective products are likely to occur due to bubble generation, and in general, the cooling time is extended to remove bubbles.

즉, 일반적인 사출 조건에서 냉각시간이 120초 이상이면 기포가 잘 발생하지 않으나 냉각시간이 120초 이하이면 용융액의 수축으로 인하여 기포가 발생하여 불량율이 높아지게 되는 것으로 알려져 있다. In other words, if the cooling time is 120 seconds or more under general injection conditions, bubbles are hardly generated, but if the cooling time is 120 seconds or less, bubbles are generated due to shrinkage of the melt, thereby increasing the defective rate.

또한, 냉각 시간이 너무 길 경우에도 원재료의 과열로 인해 기포가 발생할 수 있으며 강도가 약해지게 된다.In addition, even if the cooling time is too long, bubbles may occur due to overheating of the raw material and the strength is weakened.

본 출원인은 사출 조건을 정밀하게 제어하면서 다수의 실험을 거친 결과 일반적으로 알려져 있는 최소냉각 시간보다 짧은 냉각 시간(약 100초 정도)에서도 기포가 발생하지 않거나 기포 발생을 최소화할 수 있음을 발견하게 되었다. Applicants have found that through many experiments with precise control of the injection conditions, no bubbles are generated or the bubbles can be minimized even at a cooling time (about 100 seconds) shorter than the generally known minimum cooling time. .

이를 이하의 표 1 ~ 표 6을 참고하여 설명하기로 한다. 표 1 ~ 6의 데이터는 사전에 여러 범위의 사출 조건들을 조합하여 기포 발생율을 시험하여 1차적으로 최적범위를 설정한 후 설정된 최적범위의 사출 조건 중 하나의 사출 조건을 가변시켜 가면서 기포가 발생하지 않는 냉각 시간을 조사하여 설정된 최적범위를 검증하는 2차 실험을 한 결과를 표식화한 것이다.This will be described with reference to Tables 1 to 6 below. The data in Tables 1 to 6 test the bubble generation rate by combining various ranges of injection conditions in advance and set the optimum range first, and then change the injection condition of one of the set optimal ranges. The results of the second experiment to verify the optimal range set by examining the cooling time.

다수의 실험 결과 사출 위치(사출 성형 동안 사출 속도를 일정하게 하기 위해 수지 용융액을 단속적으로 주입하는 계량 수치)가 90mm, 60mm, 40mm, 20mm 및 5mm이고 각 사출 위치에서의 가열 실린더(4)의 가열 온도가 각각 275℃, 265℃, 260℃, 255℃, 250℃일 때 최소 냉각 시간이 얻어지는 것으로 나타났다.Numerous experiments have shown that the injection positions (quantitative values for intermittently injecting the resin melt to keep the injection speed constant during injection molding) are 90 mm, 60 mm, 40 mm, 20 mm and 5 mm and the heating of the heating cylinder 4 at each injection position. It was found that the minimum cooling time was obtained when the temperatures were 275 ° C, 265 ° C, 260 ° C, 255 ° C and 250 ° C, respectively.

따라서, 하기 표 1 ~ 6의 실험 데이터는 상기 사출 위치 및 가열 실린더(4)의 가열 온도 조건하에서 얻어진 것이다.Therefore, the experimental data of the following Tables 1 to 6 are obtained under the injection position and the heating temperature conditions of the heating cylinder 4.

표1을 살펴보면, 기타 사출 조건을 최적 설정치로 고정한 상태에서 금형(6)의 온도를 55℃ ~ 105℃로 가변시키면서 기포가 발생하지 않는 최소 냉각시간을 측정한 결과 금형 온도가 70 ~ 90℃ 인 경우 101초 이내의 냉각 시간에서 기포가 발생하지 않음이 확인되었으며, 금형 온도가 80℃일 경우 최소 냉각속도가 93초로 가장 이상적인 것으로 확인되었다. 금형 온도가 70℃ 이하이면 사출된 원재료가 과냉각되면서 수축성 기포가 발생될 수 있고, 금형 온도가 90℃ 이상이면 원재료가 과열되어 가스가 발생하면서 기포가 발생하게 된다.Referring to Table 1, the mold temperature is 70-90 ° C. as a result of measuring the minimum cooling time without foaming while varying the temperature of the mold 6 to 55 ° C.-105 ° C. with other injection conditions fixed at the optimum setting. It was confirmed that no bubbles were generated in the cooling time of less than 101 seconds, the minimum cooling rate of 93 seconds was the most ideal when the mold temperature is 80 ℃. When the mold temperature is 70 ° C. or less, contracted bubbles may be generated while the injected raw material is supercooled. If the mold temperature is 90 ° C. or more, the raw materials are overheated to generate gas while bubbles are generated.

Figure 112007058119690-PAT00001
Figure 112007058119690-PAT00001

표 2를 참조하면, 기타 사출 조건을 최적 설정치로 고정한 상태에서 사출 압력을 75 ~ 125kg/cm2 의 범위에서 가변시키면서 기포가 발생하지 않는 최소 냉각시간을 측정한 결과 사출 압력이 90 ~ 110kg/cm2인 경우 105초 이내의 냉각 시간에서 기포가 발생하지 않음이 확인되었으며, 사출 압력이 100kg/cm2 인 경우 최소 냉각속도가 93초로 가장 이상적인 것으로 확인되었다. 사출 압력이 90kg/cm2 이하이면 토출 압력 부족으로 제품 표면에 기포가 발생되고, 사출 압력이 110kg/cm2 이상이면 기포는 발생하지 않으나 금형(6)내의 공기가 급격하게 압축되면서 표면이 탄화되는 현상이 발생하는 문제점이 있다.Referring to Table 2, the injection pressure is measured between 90 and 110 kg / cm as a result of measuring the minimum cooling time without foaming while varying the injection pressure within the range of 75 to 125 kg / cm 2 with the other injection conditions fixed at the optimum setting. In the case of 2 , no bubbles were generated at the cooling time of 105 seconds or less, and the minimum cooling rate was 93 seconds at the injection pressure of 100 kg / cm 2 . Injection pressure 90kg / cm 2 If less than this, bubbles are generated on the surface of the product due to insufficient discharge pressure, and the injection pressure is 110kg / cm 2. If the above is not generated bubbles, there is a problem that the surface is carbonized while the air in the mold 6 is rapidly compressed.

Figure 112007058119690-PAT00002
Figure 112007058119690-PAT00002

표 3을 참조하면, 기타 사출 조건을 최적 설정치로 고정한 상태에서 사출 속도를 10 ~ 20mm/sec 로 가변시키면서 기포가 발생하지 않는 최소 냉각시간을 측정한 결과 사출 속도가 13 ~ 17 mm/sec 인 경우 103초 이내의 냉각 시간에서 기포가 발생하지 않음이 확인되었다. 사출 속도가 13 mm/sec 이하이면 속도가 느려 공정이 지연되는 문제점이 있으며, 사출 속도가 17 mm/sec 이상이면 유속이 증가되면서 기포가 발생하게 된다.Referring to Table 3, when the injection speed is varied from 10 to 20 mm / sec and the minimum cooling time without bubbles is measured while the other injection conditions are fixed at the optimum setting, the injection speed is 13 to 17 mm / sec. It was confirmed that no bubbles were generated in the cooling time within 103 seconds. If the injection speed is 13 mm / sec or less, there is a problem that the process is delayed because the speed is slow, and if the injection speed is 17 mm / sec or more, bubbles are generated while the flow rate is increased.

Figure 112007058119690-PAT00003
Figure 112007058119690-PAT00003

표 4를 참조하면, 기타 사출 조건을 최적 설정치로 고정한 상태에서 계량 속도(사출 후 가소화 공정을 위해 피스톤(2)이 후진하는 속도)를 5 ~ 35 mm/sec 로 가변시키면서 기포가 발생하지 않는 최소 냉각시간을 측정한 결과, 계량 속도가10 ~ 20 mm/sec 인 경우 101초 이내의 냉각 시간에서 기포가 발생하지 않음이 확인되었으며, 계량 속도가 15 mm/sec 일 경우 최소 냉각속도가 93초로 가장 이상적인 것으로 확인되었다. 계량 속도가 10 mm/sec 이하이면 기포는 발생하지 않으나 계량 속도가 사출 속도와 비슷해지는 문제점이 있으며, 계량 속도가 20 mm/sec 이상이면 유입되는 원재료의 유속이 증가되면서 기포가 발생하게 된다.Referring to Table 4, bubbles are not generated while varying the metering speed (speed at which the piston 2 retracts for the post-injection plasticization process) with other injection conditions fixed at an optimum set value. As a result of measuring the minimum cooling time, it was confirmed that no bubbles were generated in the cooling time of 101 seconds or less when the weighing speed was 10 to 20 mm / sec, and the minimum cooling rate was 93 seconds when the measuring speed was 15 mm / sec. It was found to be the most ideal. If the metering speed is less than 10 mm / sec, bubbles do not occur, but there is a problem that the metering speed is similar to the injection speed, and if the metering speed is 20 mm / sec or more, bubbles are generated as the flow rate of the incoming raw materials increases.

Figure 112007058119690-PAT00004
Figure 112007058119690-PAT00004

표 5를 참조하면, 기타 사출 조건을 최적 설정치로 고정한 상태에서 사출 시간을 10 ~ 60초로 가변시키면서 기포가 발생하지 않는 최소 냉각시간을 측정한 결과 사출 속도가 30 ~ 40초인 경우 97초 이내의 냉각 시간에서 기포가 발생하지 않음이 확인되었으며, 사출 시간이 35초일 경우 최소 냉각속도가 91초로 가장 이상적인 것으로 확인되었다. 사출 시간이 30초 이하이면 내부기포가발생_하는 문제점이 있으며, 사출 시간이 40초 이상이면 과다한 압력　및　사출시간으로　제품의　응력이　발생되어　제품의　강성자체에　문제가 되는 문제점이 있다.Referring to Table 5, when the injection time is changed to 10 to 60 seconds while the other injection conditions are fixed at the optimum setting, the minimum cooling time without bubbles is measured. It was confirmed that no bubbles were generated in time, and the minimum cooling rate was 91 seconds when the injection time was 35 seconds. If the injection time is 30 seconds or less, there is a problem that an internal bubble occurs, and if the injection time is 40 seconds or more, there is a problem in that the stress of the product is generated due to excessive pressure and injection time, which is a problem in the rigidity of the product itself.

Figure 112007058119690-PAT00005
Figure 112007058119690-PAT00005

표6을 참조하면, 기타 사출 조건을 최적 설정치로 고정한 상태에서 계량 위치를 95 ~ 145mm로 가변시키면서 기포가 발생하지 않는 최소 냉각시간을 측정한 결과 계량 위치가 110 ~ 130mm인 경우 101초 이내의 냉각 시간에서 기포가 발생하지 않음이 확인되었으며, 계량 위치가 120초일 경우 최소 냉각속도가 92초로 가장 이상적인 것으로 확인되었다. 계량 위치가 110mm 이하이면 제품의　성형　및　기포발생의 문제점이 있으며, 계량 위치가 130mm 이상이면　실린더에　체류되는　수지의 잔량이　실린더에서　과열되어　수지의　물성이　떨어짐으로　제품이　파손되는 문제점이 있다.Referring to Table 6, the cooling time is less than 101 seconds when the weighing position is 110 to 130 mm as a result of measuring the minimum cooling time without bubble generation while changing the weighing position from 95 to 145 mm with the other injection conditions fixed at the optimum setting. It was confirmed that no bubbles occurred in time, and the minimum cooling rate was 92 seconds when the weighing position was 120 seconds. If the weighing position is 110mm or less, there is a problem of the molding and bubble generation of the product. If the weighing position is 130mm or more, the remaining amount of the resin staying in the cylinder is overheated in the cylinder, which causes the product to be damaged due to the deterioration of the physical properties of the resin.

Figure 112007058119690-PAT00006
Figure 112007058119690-PAT00006

이상의 실험 결과를 정리하면, 나일론66 용융액을 90 ~ 110 kg/Cm2의 사출 압력, 13 ~ 17 mm/sec의 사출 속도, 10 ~20 mm/sec의 계량 속도, 70 ~ 90℃의 금형 온도, 30 ~ 40초의 사출 시간 및 110 ~ 130mm의 계량 위치에서 사출 성형하여 웜휠 몸체를 형성하면 90 ~ 110 초의 냉각 시간에서도 기포발생이 최소화될 수 있다.The above results are summarized as follows: Nylon 66 melt is injected into 90 ~ 110 kg / Cm 2 injection pressure, 13 ~ 17 mm / sec injection speed, 10 ~ 20 mm / sec weighing speed, 70 ~ 90 ℃ mold temperature, When injection molding is performed at an injection time of 30 to 40 seconds and a weighing position of 110 to 130 mm to form a worm wheel body, bubble generation can be minimized even at a cooling time of 90 to 110 seconds.

최적의 실시예에 따르면, 100kg/Cm2의 사출 압력, 15 mm/sec의 사출 속도, 15 mm/sec의 계량 속도, 80℃의 금형 온도, 35초의 사출 시간 및 120mm의 계량 위치의 조건에서 사출성형한 경우 90초의 최소 냉각시간(기포가 발생하지 않는 최소 냉각시간)을 얻을 수 있는 것으로 확인되었다.According to the preferred embodiment, injection is carried out under conditions of injection pressure of 100 kg / Cm 2 , injection speed of 15 mm / sec, weighing speed of 15 mm / sec, mold temperature of 80 ° C., injection time of 35 seconds and weighing position of 120 mm. In the case of molding, it was confirmed that a minimum cooling time of 90 seconds (minimum cooling time without bubbles) was obtained.

상기와 같은 조건하에서 사출성형에 의해 형성된 웜휠 몸체의 외주면을 치가공하면 감속기어용 웜휠 이 완성된다.If the outer peripheral surface of the worm wheel body formed by injection molding under the conditions described above is toothed, the worm wheel for the reduction gear is completed.

비록 본 발명이 상기 언급된 바람직한 실시예와 관련하여 설명되어졌지만, 발명의 요지와 범위로부터 벗어남이 없이 다양한 수정이나 변형을 하는 것이 가능하다. 따라서 첨부된 특허청구의 범위는 본 발명의 요지에서 속하는 이러한 수정이나 변형을 포함할 것이다.Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

도 1은 종래 압입 방식에 의한 조향장치의 감속기어용 웜휠 제조방법을 도시한 것이다.1 illustrates a method for manufacturing a worm wheel for a reduction gear of a steering apparatus according to a conventional press-fit method.

도 2는 일반적인 사출성형기의 구조를 도시한 단면도이다.2 is a cross-sectional view showing the structure of a general injection molding machine.

<주요도면부호에 관한 설명><Description of main drawing code>

1 : 호퍼 2 : 피스톤1: Hopper 2: Piston

3 : 유압구동부 4 : 가열 실린더3: hydraulic drive part 4: heating cylinder

5 : 노즐 6 : 금형5: nozzle 6: mold

Claims (4)

나일론66 수지 용융액을 90 ~ 110 kg/Cm2의 사출 압력, 13 ~ 17 mm/sec의 사출 속도, 10 ~ 20 mm/sec의 계량 속도, 70 ~ 90℃의 금형 온도, 30 ~ 40초의 사출시간, 110 ~ 130mm의 계량 위치의 조건하에서 사출한 후 외주면을 치가공하여 이루어지는 것을 특징으로 하는 사출성형을 이용한 조향장치의 감속기어용 웜휠 제조방법.Injection pressure of nylon 66 resin melt is 90 ~ 110 kg / Cm 2 , 13 ~ 17 mm / sec injection speed, 10 ~ 20 mm / sec weighing speed, 70 ~ 90 ℃ mold temperature, 30 ~ 40 sec injection time , The manufacturing method of the worm wheel for the reduction gear of the steering apparatus using the injection molding, characterized in that the injection molding under the condition of the measuring position of 110 ~ 130mm after the outer peripheral surface. 제 1 항에 있어서,The method of claim 1, 상기 사출 성형에서 사출 위치가 90mm, 60mm, 40mm, 20mm 및 5mm인 것을 특징으로 하는 사출성형을 이용한 조향장치의 감속기어용 웜휠 제조방법.Method of manufacturing a worm wheel for the reduction gear of the steering apparatus using the injection molding, characterized in that the injection position in the injection molding is 90mm, 60mm, 40mm, 20mm and 5mm. 제 2 항에 있어서,The method of claim 2, 상기 각 사출 위치에서 가열 실린더의 온도는 각각 275℃, 265℃, 260℃, 255℃, 250℃인 것을 특징으로 하는 사출성형을 이용한 조향장치의 감속기어용 웜휠 제조방법.The temperature of the heating cylinder at each injection position is 275 ° C, 265 ° C, 260 ° C, 255 ° C, 250 ° C, characterized in that the worm wheel manufacturing method for the reduction gear of the steering apparatus using the injection molding, characterized in that. 제 1 항에 있어서,The method of claim 1, 금형에 토출된 용융액은 90 ~ 110초의 냉각 시간을 갖는 것을 특징으로 하는 사출성형을 이용한 조향장치의 감속기어용 웜휠 제조방법.Method for producing a worm wheel for a reduction gear of the steering apparatus using injection molding, characterized in that the melt discharged to the mold has a cooling time of 90 ~ 110 seconds.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104093622A (en) * 2012-02-13 2014-10-08 南阳工业株式会社 MDPS worm gear and method for manufacturing same
KR101649581B1 (en) 2015-03-18 2016-08-22 주식회사 엠티씨 A Method For Fabricating Worm-wheel
US10406737B2 (en) 2015-03-18 2019-09-10 Mtc Co., Ltd. Injection molding apparatus for worm wheel

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JPH08312757A (en) * 1995-05-19 1996-11-26 Mitsubishi Gas Chem Co Inc Worm wheel made of resin and manufacture thereof
JPH10305469A (en) 1997-05-08 1998-11-17 Shoei:Kk Method for foaming manufacture of resin product without use of foaming agent, and foamed resin product

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104093622A (en) * 2012-02-13 2014-10-08 南阳工业株式会社 MDPS worm gear and method for manufacturing same
KR101649581B1 (en) 2015-03-18 2016-08-22 주식회사 엠티씨 A Method For Fabricating Worm-wheel
US10406737B2 (en) 2015-03-18 2019-09-10 Mtc Co., Ltd. Injection molding apparatus for worm wheel

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