KR100320591B1 - Ball stud fabrication - Google Patents
Ball stud fabrication Download PDFInfo
- Publication number
- KR100320591B1 KR100320591B1 KR1019990053873A KR19990053873A KR100320591B1 KR 100320591 B1 KR100320591 B1 KR 100320591B1 KR 1019990053873 A KR1019990053873 A KR 1019990053873A KR 19990053873 A KR19990053873 A KR 19990053873A KR 100320591 B1 KR100320591 B1 KR 100320591B1
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- South Korea
- Prior art keywords
- cold
- ball stud
- steel
- cold forging
- product
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000010273 cold forging Methods 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 abstract description 14
- 238000005520 cutting process Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 abstract description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- 238000005482 strain hardening Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
- B21K1/46—Making machine elements bolts, studs, or the like with heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/003—Selecting material
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
냉간단조에 의하여 일측에 길이방향으로 머리부와 테이퍼부와 꼬리부가 일체형으로 형성되는 냉간 압조용 비조질강 볼스터드에 있어서, 상기 비조질강은 7kg/㎟∼10kg/㎟인 것을 특징으로 한다. 또한, 상기 비조질강의 조성은 C 0.47%, Si 0.62%, Mn 1.2%, P 0.015% , S 0.003%, Cr 0.12%, V 0.01%, Ti 0.017%의 성분이 포함되어 제조되는 것을 포함한다. 이와 같이, 본 발명에 따르는 7kg/㎟∼10kg/㎟에 해당하는 비조질강을 절삭가공하지 않고 롤링공정에 의해 제품을 완성하므로서 제조공정이 간소화되고, 동시에 냉간단조품의 절삭가공에 따른 시간적, 경제적 손실을 방지하여 생산성을 향상시킴은 물론, 절삭가공에 따른 소재의 강도 하락을 방지하고, 냉간단조 후 상승되는 인성작용 및 연신율의 향상으로 충격하중이 발생할 경우 파손의 위험성이 떨어지기 때문에 제품의 안정성이 높아지게 되고 이로 인한 기계적 성능을 향상시키게 된다. 또한, 비조질강의 조성이 C 0.47%, Si 0.62%, Mn 1.2%, P 0.015%, S 0.003%, Cr 0.12%, V 0.01%, Ti 0.017%의 성분이 포함되어 제조되기 때문에 가공경화를 받게되면 연신율이 증가하기 때문에 성형에 매우 적합하여 사용자의 사용상 편리성 및 효율성을 극대화 할 수 있다.In the cold-rolled non-ferrous steel ball stud is formed integrally with the head portion, the tapered portion and the tail portion on the one side by the cold forging, the non-coated steel is characterized in that 7kg / ㎜ ~ 10kg / ㎜. In addition, the composition of the non-alloyed steel includes a component including 0.4 0.4% C, 0.62% Si, 1.2% Mn, P 0.015%, S 0.003%, Cr 0.12%, V 0.01%, and Ti 0.017%. As such, the manufacturing process is simplified by completing the product by a rolling process without cutting the non-annealed steel corresponding to 7 kg / mm 2 to 10 kg / mm 2 according to the present invention, and at the same time, the time and economic loss caused by the cutting of the cold forged product. To improve the productivity by preventing the damage, and to prevent the strength of the material from being cut, and to increase the toughness and elongation after cold forging. This results in higher mechanical performance. In addition, since the composition of the non-alloyed steel is manufactured by containing components of C 0.47%, Si 0.62%, Mn 1.2%, P 0.015%, S 0.003%, Cr 0.12%, V 0.01%, and Ti 0.017%, they are subjected to work hardening. If the elongation is increased, it is very suitable for molding, maximizing user convenience and efficiency.
Description
본 발명은 자동차의 스티어링계통이나 서스펜션계통등의 관절부에 사용되는 볼스터드 제조방법에 관한 것으로, 더욱 상세하게 설명하면 볼 스터드의 제조시 절삭가공을 하지 않고 롤링공정에 의해 성형하기 때문에 제조공정이 간소화되고, 동시에 소정의 화학성분이 소정의 비율로 첨가되어 그 성형있어 적합하기 때문에 볼스터드의 기계적성능을 향상시키는 볼스터드 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a ball stud used in joints such as a steering system or a suspension system of an automobile. More specifically, the manufacturing process is simplified because the molding is performed by a rolling process without cutting during the manufacturing of the ball stud. The present invention relates to a method for producing a ball stud, which improves the mechanical performance of a ball stud because at the same time, a predetermined chemical component is added at a predetermined ratio and is suitable for molding.
일반적으로 종래에 사용된 볼스터드의 제조공정은 도 1과 도 2에 도시된 바와 같이, 열처리가 필요한 구조용강재의 내부균열을 없애고 결정립을 미세화시켜 재료의 연성을 높이기 위해 어닐링(Annealing : 풀림)처리하여 머리부(102)와 테이퍼부(105) 그리고 꼬리부(106)로 구성되어 구상화된 냉간 단조품(101)을 생산하고, 상기 구조용강재의 경도를 향상시키기 위해 담금질 과정을 거친후 담금질 과정에서 경도가 향상되는 반면 재질이 여리게 되므로 구조 용강재의 경도를 낮추고 점성을 높이기 위해 템퍼링(Tempering: 뜨임)과정에서 열처리 한다.In general, the manufacturing process of the ball stud used in the prior art, as shown in Fig. 1 and 2, to remove the internal cracks of structural steel that requires heat treatment and to refine the grains to increase the ductility of the material (annealing) treatment The head 102, the tapered portion 105 and the tail portion 106 by forming a spherical cold forging 101, and after the quenching process to improve the hardness of the structural steel material hardness in the quenching process While the material is thinner, the heat treatment is performed during tempering (tempering) to lower the hardness and increase the viscosity of the structural steel.
상기와 같은 과정을 거친 냉간단조품의 꼬리부(106)에 핀홀구멍 가공을 한 후, 냉간 단조품(101)의 목부와 머리부(102)의 절삭가공 단계를 거친 이후, 상기 머리부(102)의 표면을 평활하게 하여 경도의 상승을 이루고 압축력을 잔류시켜 강도와 내마모성을 향상시키도록 하기위해 버니싱(Burnishing)을 하고, 꼬리부(106)의 나사전조단계를 거치게 된다.After the pinhole hole processing is performed on the tail portion 106 of the cold forged product, which has been subjected to the above process, and after the cutting process of the neck and the head 102 of the cold forged product 101, the head of the head 102 The surface is smoothed to achieve an increase in hardness and to retain the compressive force to improve strength and wear resistance, and to be burned and subjected to a thread rolling step of the tail 106.
한편, 도 2에 도시된 바와 같이 냉간단조품은 머리부와 테이퍼부, 꼬리부로 구성되어 있고, 상기 머리부는 절삭가공을 이룰 수 있도록 1mm정도의 가공여유를 확보하고 있으며, 상하형의 분할선상에는 머리부의 가공후 머리부의 진구도를 향상시킬 수 있도록 단이 형성되어 있다.On the other hand, as shown in Figure 2, the cold forging is composed of a head portion, a tapered portion, the tail portion, the head portion secures the processing margin of about 1mm to achieve cutting processing, the head on the upper and lower dividing line The stage is formed to improve the sphericity of the head after the processing of the part.
이와 같은, 종래의 볼스터드는 후 열처리가 필요한 강제를 사용하여 냉간단조품을 생산한 후 별도의 열처리를 하여야 하는 작업상의 번거로움과 이로 인해 과다한 작업시간이 소요되고, 상기 냉간단조품을 절삭가공하므로써 머리부의 정확한 동심도를 얻지 못함은 물론 제품의 강도가 저하되는 등의 문제점이 있다. 또한, 냉간단조품의 절삭에 따른 재료의 낭비가 있어 경제적이지 못한 문제점이 있다.As such, the conventional ball stud is produced by using a steel for which post-heat treatment is required, and after producing a cold forging, it is necessary to perform a separate heat treatment, and thus excessive work time is required, and by cutting the cold forging, Not only accurate concentricity is obtained but also the strength of the product is lowered. In addition, there is a problem in that it is not economical because there is a waste of material due to the cutting of the cold forging.
본 발명은 상기와 같은 문제점을 해결하기 위해 안출한 것으로, 7kg/㎟∼10kg/㎟의 냉간 압조용 비조질강을 롤링공정에 의해 제품을 완성함으로써 제조공정이 간소해져 제조에 따른 시간적 경제적 손실을 줄일 수 있고, 절삭가공에 따른 제품의 강도하락을 방지하게 되어 제품의 기계적 성능을 향상시킬 수 있으며, 또한 비조질강을 소정의 조성성분으로 제작하여 성형에 효율적일 수 있도록 하는 볼스터드 제조방법을 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, by completing the product by the rolling process of the cold-rolled non-annealed steel of 7kg / mm2 ~ 10kg / mm2, the manufacturing process is simplified to reduce the time and economic loss due to manufacturing It is possible to improve the mechanical performance of the product by preventing the strength drop of the product due to the cutting process, and also to provide a manufacturing method of the ball stud to be made in a predetermined composition component to be efficient in molding There is a purpose.
도 1은 종래 볼 스터드의 제조공정을 나타내는 공정도이고,1 is a process chart showing a manufacturing process of a conventional ball stud,
도 2는 종래 볼스터드를 제조하기 위한 냉간단조품을 도시한 정면도이며,Figure 2 is a front view showing a cold forging for producing a conventional ball stud,
도 3은 본 발명에 따른 볼 스터드의 제조공정을 나타내는 공정도이고,3 is a process chart showing a manufacturing process of a ball stud according to the present invention,
도 4는 본 발명에 따른 볼스터드를 제조하기 위한 냉간단조품을 도시한 정면도이며,Figure 4 is a front view showing a cold forging for producing a ball stud according to the present invention,
도5는 본 발명에 따른 볼 스터드의 제조공정 중 냉간단조품의 목부 롤링공정을 개략적으로 도시한 단면도이다.Figure 5 is a cross-sectional view schematically showing the neck rolling process of the cold forging product manufacturing process of the ball stud according to the present invention.
<도면의 주요 부분에 대한 명칭><Name of main part of drawing>
200 : 냉간단조품 201 : 머리부200: cold forging 201: head
202 : 평면부 203 : 목부202: flat portion 203: neck
204 : 테이퍼부 205 : 꼬리부204: Taper 205: Tail
304 : 클램핑장치 305 : 스토퍼304: clamping device 305: stopper
306 : 롤 다이스 400 : 목부 롤링공정306: roll die 400: neck rolling process
500 : 머리부 버니싱공정 600 : 꼬리부 나사전조공정500: head burnishing process 600: tail screw rolling process
상기한 목적을 달성하기 위해 본 발명은 냉간단조에 의하여 일측에 길이방향으로 머리부와 테이퍼부와 꼬리부가 일체형으로 형성되는 볼스터드를 냉간 압조용 비조질강으로 제조하기 위한 볼스터드 제조방법에 있어서, 상기 비조질강이 C 0.47%, Si 0.62%, Mn 1.2%, P 0.015%, S 0.003%, Cr 0.12%, V 0.01%, Ti 0.017%의 성분이 포함되어 7kg/㎟∼10kg/㎟급으로 제조된 것을 특징으로 하는 볼스터드 제조방법이 제공된다.In order to achieve the above object, the present invention provides a ball stud manufacturing method for manufacturing a cold-rolled non-thick steel ball studs formed integrally with the head portion, the tapered portion and the tail portion in the longitudinal direction on one side by cold forging, The non-alloyed steel is produced in 7kg / ㎜ ~ 10kg / ㎜ class containing the components of C 0.47%, Si 0.62%, Mn 1.2%, P 0.015%, S 0.003%, Cr 0.12%, V 0.01%, Ti 0.017% Provided is a method for producing a ball stud.
이하, 본 발명에 의한 볼 스터드는 본 출원인이 선출원한 한국 특허 98-30948을 인용 개량 발명한 것으로서, 도면을 참조하여 상세하게 설명하면 다음과 같다.Hereinafter, the ball stud according to the present invention is an invention in which the applicant has previously filed and revised Korean Patent 98-30948, which will be described in detail with reference to the drawings.
본 발명인 볼스터드의 제조방법에 있어서 원료재인 냉간단조품에 대해 설명하면 다음과 같다. 본 냉간단조품의 조성은 C 0.47%, Si 0.62%, Mn 1.2%, P 0.015% , S 0.003%, Cr 0.12%, V 0.01%, Ti 0.017%의 성분이 포함되어 제조된 7kg/㎟∼10kg/㎟급의 비조질강을 냉간단조에 의하여 생산하게 된다.The cold forging product which is a raw material in the manufacturing method of the ball stud of this invention is as follows. The composition of this cold forged product is 7kg / mm 2 ~ 10kg / prepared containing C 0.47%, Si 0.62%, Mn 1.2%, P 0.015%, S 0.003%, Cr 0.12%, V 0.01%, Ti 0.017% Ammonia-grade non-steel is produced by cold forging.
이때, 상기 냉간단조에 의하여 생산되는 냉간단조품은 일측 길이 방향으로 머리부(201)와 테이퍼부(204), 꼬리부(205)가 일체로 형성되고, 상기 냉간단조품(200)의 머리부(201)에는 상·하 분할선이 중앙부로 소정의 폭(t)을 갖는 평면부가 형성되어 있다.In this case, the cold forged product produced by the cold forging is formed with the head portion 201, the tapered portion 204, the tail portion 205 integrally in one longitudinal direction, the head portion 201 of the cold forging 200 ), A flat portion having a predetermined width t is formed at the center of the upper and lower dividing lines.
따라서, 상기 냉간 단조품을 롤링공정에 의하여 볼스터드를 제조시 체적이 큰 곳에서 작은 곳으로 체적을 이동하면서 머리부(201)의 진구도를 형성하게 되고, 상기 냉간단조품의 동심도는 0.15mm이내로 제조된다.Therefore, when the cold forged product is manufactured by a rolling process, the spherical shape of the head portion 201 is formed while moving the volume from a large place to a small place, and the concentricity of the cold forged product is manufactured within 0.15 mm. do.
상기의 냉간단조품을 볼스터드로 성형시 공정을 도 3과 도 4 및 도 5를 통해 설명하면 다음과 같다.The process of forming the cold forged product into a ball stud will be described with reference to FIGS. 3, 4, and 5 as follows.
상기 냉간단조품을 자동이송장치로 이송하여 머리부(201)와 꼬리부(105)를 스토퍼(305)로 고정하고 테이퍼부(204)를 클램핑장치(304)로 고정한 후 롤 다이스(306)로 목부(203)를 롤링하는 목부롤링단계(400)와, 상기 냉간단조품의 머리부(201)를 냉간단조에 의해서 발생한 동심도 편차를 보정하기위하여 테이퍼부(204)를 클램핑장치(304)로 고정하고 꼬리부(205)를 스토퍼로(305) 고정한 후 버니싱하는 머리부 버니싱단계(500)와, 상기 냉간단조품의 꼬리부(205)에 나사를 성형하게 되는 꼬리부 나사전조단계(600)에 의해 본 발명인 볼스터드가 완성하게 된다.The cold forged product is transferred to the automatic transfer device to fix the head 201 and the tail 105 with the stopper 305, and the taper part 204 with the clamping device 304, and then the roll die 306 with the neck. In order to correct the concentricity deviation caused by the cold rolling, the neck rolling step 400 for rolling the head 203 and the cold forging, the taper part 204 is fixed with the clamping device 304 and the tail By the head burnishing step 500 for fixing the part 205 with a stopper 305 and then burnishing, and a tail screw rolling step 600 for forming a screw in the tail part 205 of the cold forging. The bolster which is this invention is completed.
상기 목부롤링단계(400)에 있어서, 상기 냉간단조품의 평면부를 이용하여 냉간단조품의 머리부가 축을 중심으로 요동이 없도록 스토퍼(305)와 클램핑장치(304)로 견고하게 고정하여야 하고, 상기 머리부(201)로부터 냉간단조품의 접힘 현상이 발생하지 않도록 냉간단조품의 머리부(201)와 테이퍼부(204)에 걸쳐서 클램핑장치(304)를 설치하고, 상기 클램핑장치(304) 사이에 롤 다이스(306)를 설치하여야 한다.In the neck rolling step 400, by using the flat part of the cold forging product, the head of the cold forging product should be firmly fixed with the stopper 305 and the clamping device 304 so that there is no fluctuation about the axis. The clamping device 304 is provided over the head 201 and the taper part 204 of the cold forging product so that the cold forging product is not folded from 201, and a roll die 306 is provided between the clamping device 304. Should be installed.
상기 머리부 버니싱단계(500)에 있어서, 상기 머리부(201)와 상기 목부(203)사이에 나타나는 날카로운 부분을 없애고, 상기 머리부(201)는 0.2Ra이하의 표준 조도를 유지하도록 하고, 동시도의 교정량은 비조질강을 사용하였을 경우 편측에서 0.1mm까지 성형 할 수 있도록 한다.In the head burnishing step 500, to remove the sharp portion appearing between the head 201 and the neck 203, the head 201 is to maintain a standard roughness of 0.2Ra or less, Simultaneous correction amount can be formed up to 0.1mm from one side when using non-coated steel.
상기 꼬리부(205)의 나사전조 단계(600)에서 생산사이클은 40EA/min이다.In the thread rolling step 600 of the tail 205, the production cycle is 40EA / min.
상기와 같은, 제조단계를 거쳐서 완성된 볼스터드는 상기 출원인의 선출원과 비교해 볼때, 기존의 제조공정을 거쳐서 제조된 볼 스터드보다 굽힘강도가 150%이상 상승하게 되고, 상기 목부의 경도는 100HV이상 상승하게 되며, 피로하중에 대하여서는 200%이상 향상되었다. 또한, 굽힘 피로도에 관한 시험 결과는 하기의 그래프와 같고, 이는 현품과 동일한 특성을 가진다.Compared to the applicant's prior application, the ball stud completed through the manufacturing step as described above, the bending strength is increased by 150% or more than the ball stud manufactured through the existing manufacturing process, the hardness of the neck is increased to 100HV or more The fatigue load was improved by more than 200%. In addition, the test results regarding the bending fatigue are as shown in the graph below, which has the same characteristics as the actual product.
그리고, 가공도에 따른 인장강도와 연신율의 변화 특성은 하기의 그래프에 나타낸 바와 같다.In addition, the change characteristics of tensile strength and elongation according to workability are as shown in the following graph.
상기의 그래프들은 본 발명품(POSMA45S)과 기타 다른 볼스터드의(SCM435, LH85)의 인장피로도를 시험한 결과를 나타내는 것으로서 가공도에 따른 인장강도및 연신률이 크게 향상되었음을 보여주는 것이다.The above graphs show the results of testing the tensile fatigue of the present invention (POSMA45S) and the other ball studs (SCM435, LH85), showing that the tensile strength and elongation according to the workability is greatly improved.
이와 같은, 볼스터드는 그 제조단계에 있어 종래의 제조단계에 비해 매우 간소화 되었기 때문에 작업시간이 단축되어 생산성이 크게 향상되었고, 절삭가공에 따른 원료재의 낭비를 방지할 수 있어 경제적이며, 또한 냉간단조품의 조성이 C 0.47%, Si 0.62%, Mn 1.2%, P 0.015% , S 0.003%, Cr 0.12%, V 0.01%, Ti 0.017%으로 제조되어 인장강도는 92.9kg/㎟∼95.1kg/㎟로 나타나고, 연신율은 12.1%∼12.5%로 성형에 매우 적합하며, 충격강도는 상온에서는 65Joule∼115Joule을 저온에서는(-30℃) 40Joule의 충격강도를 보이며, 경도는 259Hv∼297Hv로 나타나서, 동시에 제품의 기계적인 성질의 강도를 증가시켜 제품이 성능에 향상을 가져왔다.As such, the bolster has been greatly simplified in the manufacturing stage compared with the conventional manufacturing stage, so the working time is shortened and the productivity is greatly improved, and the waste of the raw materials due to the cutting process can be prevented, which is economical, The composition is made of C 0.47%, Si 0.62%, Mn 1.2%, P 0.015%, S 0.003%, Cr 0.12%, V 0.01%, Ti 0.017%, and the tensile strength is 92.9kg / mm2 ~ 99.1kg / mm2. Elongation is 12.1% ~ 12.5%, which is very suitable for molding. Impact strength is 65Joule ~ 115Joule at room temperature and 40Joule at low temperature (-30 ℃), and hardness is shown as 259Hv ~ 297Hv. Increasing the strength of the properties, the product has improved performance.
따라서, 상기와 같이 제조된 볼 스터드를 볼 조인트에 조립하여 실사용시 요동 및 회전토크가 절삭가공에 의하여 제조된 볼 스터드에 비하여 현저하게 저하되며, 냉간단조 후 상승되는 인성작용의 영향으로 충격하중이 발생할 경우 파손의 위험성이 떨어져 제품의 안정성이 높아지게 된다.Therefore, when the ball stud manufactured as described above is assembled to the ball joint, the swing and rotation torque are significantly lowered compared to the ball stud manufactured by cutting, and the impact load is increased due to the toughness effect after cold forging. If this happens, there is a risk of breakage, which increases the stability of the product.
이상에서 상술한 바와 같이, 본 발명에 따른 볼스터트 제조방법에 의하면 7kg/㎟∼10kg/㎟에 해당하는 비조질강을 절삭가공하지 않고 롤링공정에 의해 제품을 완성하므로써 제조공정이 간소화되고, 동시에 냉간단조품의 절삭가공에 따른 시간적, 경제적 손실을 방지하여 생산성을 향상시킴은 물론 절삭가공에 따른 소재의 강도 하락을 방지할 수 있으며, 냉간단조 후 상승되는 인성작용 및 연신율의 향상으로 충격하중이 발생할 경우 파손의 위험성이 떨어지기 때문에 제품의 안정성이 높아지게 되고 이로 인한 기계적 성능을 향상시키게 된다. 또한, 비조질강의 조성이 C 0.47%, Si 0.62%, Mn 1.2%, P 0.015%, S 0.003%, Cr 0.12%, V 0.01%, Ti 0.017%의 성분이 포함되어 제조되기 때문에 가공경화를 받으면 연신률이 증가하기 때문에 성형에 매우 적합하여 사용자의 사용상 편리성 및 효율성을 극대화 할 수 있다.As described above, according to the method for manufacturing a ball stud according to the present invention, the manufacturing process is simplified by cold rolling the non-crude steel corresponding to 7 kg / mm 2 to 10 kg / mm 2 by the rolling process, and at the same time cold In addition to improving the productivity by preventing time and economic loss due to cutting of forged products, it is possible to prevent the strength of the material from being cut.In case of impact loads due to the increased toughness and elongation after cold forging. The risk of breakage is lessened, which increases the stability of the product and thus improves mechanical performance. In addition, since the composition of the non-alloyed steel is made of components including C 0.47%, Si 0.62%, Mn 1.2%, P 0.015%, S 0.003%, Cr 0.12%, V 0.01%, and Ti 0.017%, As elongation increases, it is very suitable for molding, maximizing user convenience and efficiency.
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| KR1019990053873A KR100320591B1 (en) | 1999-11-30 | 1999-11-30 | Ball stud fabrication |
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| KR1019990053873A KR100320591B1 (en) | 1999-11-30 | 1999-11-30 | Ball stud fabrication |
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| KR100320591B1 true KR100320591B1 (en) | 2002-01-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101182592B1 (en) * | 2012-04-02 | 2012-09-19 | 주식회사 연합화스너 | Product method of ball stud fastener |
| KR101687347B1 (en) | 2016-02-12 | 2016-12-20 | 동명대학교산학협력단 | High-frequency annealing treatment apparatus for ball stud |
| KR20210090033A (en) | 2020-01-09 | 2021-07-19 | (주)건홍지오메트 | High frequency induction heating machine for drying coating of ball stud |
-
1999
- 1999-11-30 KR KR1019990053873A patent/KR100320591B1/en active IP Right Grant
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101182592B1 (en) * | 2012-04-02 | 2012-09-19 | 주식회사 연합화스너 | Product method of ball stud fastener |
| KR101687347B1 (en) | 2016-02-12 | 2016-12-20 | 동명대학교산학협력단 | High-frequency annealing treatment apparatus for ball stud |
| KR20210090033A (en) | 2020-01-09 | 2021-07-19 | (주)건홍지오메트 | High frequency induction heating machine for drying coating of ball stud |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010048972A (en) | 2001-06-15 |
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