KR100225967B1 - Method for forming internal thread of sintered alloy body - Google Patents

Method for forming internal thread of sintered alloy body Download PDF

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KR100225967B1
KR100225967B1 KR1019970023087A KR19970023087A KR100225967B1 KR 100225967 B1 KR100225967 B1 KR 100225967B1 KR 1019970023087 A KR1019970023087 A KR 1019970023087A KR 19970023087 A KR19970023087 A KR 19970023087A KR 100225967 B1 KR100225967 B1 KR 100225967B1
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female
hole
furnace
screw
powder
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KR1019970023087A
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KR19980086342A (en
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서정태
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서정태
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/06—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of threaded articles, e.g. nuts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)

Abstract

본 발명은 탄화텅스텐분말과 금속코발트분말을 일정비율로 혼합한 소재를 압축성형한 소결물에 일정의 암나사를 성형하는 방법에 관한 것으로 금속코발트 분말과 탄화텅스텐 분말의 환합물을 압착성형틀에 넣고 600-100Kg/cm2압력으로 성형하여 800℃전후에서 1차소결하고 1차소결물(1)에 암나사용 구멍(2)을 내고 구멍속에 저속회전 탭공구(3)를 투입하여 구멍내면에 암나사(201)를 성형하되 피치의 간격을 완성품의 피치간격보다 20-25%크게 확대된 규격으로 성형하고 나사홈을 깨끗하게 청소한후 소결로(진공로 또는 수소로)에 넣어 1350-1500℃의 온도로 2차 소결시킴을 특징으로 하는 성형방법이다.The present invention relates to a method for forming a predetermined female screw in a compression molded sintered material in which a tungsten carbide powder and a metal cobalt powder are mixed at a predetermined ratio, and a mixture of metal cobalt powder and tungsten carbide powder is placed in a compression mold. Molded at 600-100Kg / cm 2 pressure and sintered first at around 800 ℃, inserting the female threaded hole (2) into the primary sintered material (1), and inserting the low-speed rotary tapping tool (3) into the hole. Mold 201, but the pitch interval is 20-25% larger than the pitch interval of the finished product, and the screw grooves are cleaned and put in a sintering furnace (vacuum furnace or hydrogen furnace) to a temperature of 1350-1500 ℃. It is a molding method characterized by secondary sintering furnace.

Description

소결합금체(燒結合金體)의 암나사 성형(成形)방법Forming method of female thread of small bond metal body

본 발명은 탄화텅스텐분말과 금속코발트분말을 일정비율로 혼합한 소재를 압축성형한 소결물에 일정의 암나사를 성형하는 방법에 관한 것이다.The present invention relates to a method of forming a predetermined female screw on a sintered compact obtained by compression molding a material in which a tungsten carbide powder and a metal cobalt powder are mixed at a constant ratio.

탄화텅스텐분말과 금속코발트분말을 혼합하여 필요한 모양으로 압축성형하고 소결한 소결합금체는 분말야금 초경합금체로써 강도와 내마모성이 특출하므로 특정의 금형이나 공구제조에 사용되고 있다.Small-bonded metal bodies, which are compression molded and sintered by mixing tungsten carbide powder and metal cobalt powder in the required shape, are powder metallurgical cemented carbide bodies and are used in the manufacture of specific molds and tools because of their strength and wear resistance.

그러나 재질자체의 강도와 내구성이 고강도이기 때문에 소결된 합금체에 암나사구멍을 뚫는 것은 고강도의 특수공구와 특정장비를 요하므로 전문화된 인력과 많은 비용이 소요되는 생산단가가 높아지기 때문에 실시에 상당한 애로가 있었다.However, because the strength and durability of the material itself is high, drilling female threaded holes in the sintered alloy requires high-strength special tools and special equipment, which increases the specialized manpower and costly production cost, which makes it difficult to implement. there was.

본원 출원인은 이를 해결하기 위해 다년간의 연구와 실험을 한 결과 소결합금체에 암나사를 성형하는 방법을 개발한 것인데 이를 보다 상세히 도면에 의거 설명하면 다음과 같다.Applicant has developed a method of forming a female screw in a small bonding body as a result of many years of research and experiments to solve this problem will be described in more detail based on the drawings as follows.

제1도는 본 발명의 전체적인 제조공정예시도1 is an illustration of the overall manufacturing process of the present invention

제2a,b도는 본 발명의 나사내기에 사용되는 탭공구 예시도Figure 2a, b is an illustration of the tap tool used in the screwing of the present invention

제3a,b,c도는 본 발명의 나사내기 과정을 보이는 예시도이다.3a, b, and c are exemplary views showing the screwing process of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 1차소결물 2 : 구멍1: primary sintered 2: hole

201 : 암나사 202 : 절삭칩201: internal thread 202: cutting chip

3 : 탭공구 4 : 공기주입공3: tap tool 4: air injection hole

401 : 배출공 5 : 절삭칩청소기401: discharge hole 5: cutting chip cleaner

일반적으로 알려진 소결합금체는 도1에서 보이는 제조공정에 따라 제조되는 것으로, 금속코발트분말과 탄화텅스텐분말, 기타 첨가물 등을 중량비로 일정하게 혼합한 후 건조시킨 다음 미세한 채 위에서 진동시켜 정제된 분말상태로 만들고, 이를 만들고자 하는 목적물에 맞도록 제작한 금형에 넣고 600-1000Kg/cm2압력으로 가압성형하여 필요한 모양으로 성형한 다음 소결로(진공로 혹은 수소로)에 놓고 800℃전후로 1차소결(PRESINTERING)하여 성형물을 얻고 이를 인출하여 기계적인 가공을 한 다음 최종 소결로에 넣고 1350-1500℃의 고온에서 장시간동안 소결을 실시하여 코발트금속분말이 녹아 액상소결하는 소결합금체를 얻어 이를 검사하여 포장하는 방법으로 제조하는 것이 보편화되어 있다.Generally known small-bonded gold body is manufactured according to the manufacturing process shown in Figure 1, a metal powder cobalt powder, tungsten carbide powder, other additives, etc. are constantly mixed in a weight ratio, dried, and then finely vibrated and refined in a fine powder state. Put it in the mold manufactured to meet the target object to make it, press-molded at 600-1000Kg / cm 2 pressure, shape it to the required shape, put it in a sintering furnace (vacuum furnace or hydrogen furnace), and then sinter it before and after 800 ℃. PRESINTERING) to obtain the molded product, drawing it out, and mechanically processing it, and then putting it in the final sintering furnace and sintering at a high temperature of 1350-1500 ° C. for a long time to obtain a small-bonded metal body in which cobalt metal powder is melted and liquid-sintered. Manufacturing by the method of making is common.

따라서 이러한 분말야금법으로 제조한 소결물은 분말소재를 압축성형하여 1차소결하고 2차소결을 마치면 코발트금속분말의 액상소결 효과로 인해 최초의 체적이 20-25%범위에서 수축이 일어나고 이러한 수축율은 소재의 종류에 따라 약간의 차이가 있으나 텅스텐분말을 주재로 하는 초경소결합금체에서는 25%전후의 수축현상을 볼 수 있다.Therefore, the sintered product manufactured by the powder metallurgy method compresses the powder material firstly and after the second sintering, due to the liquid phase sintering effect of the cobalt metal powder, the initial volume shrinks in the range of 20-25%, and this shrinkage rate Although there is a slight difference depending on the type of silver material, the shrinkage phenomenon of around 25% can be seen in the tungsten carbide body mainly composed of tungsten powder.

본 발명은 이러한 현상을 이용하여 허용공차범위내에 만족하는 암나사를 성형할 수 있었다.The present invention was able to form a female screw that satisfies the tolerance range using this phenomenon.

이를 구체적으로 설명하면 다음과 같다.This will be described in detail as follows.

도3에는 나사내기 방법이 예시되어 있다.3 illustrates a screwing method.

본 발명은 1차소결이 끝난 1차소결물(1)에 암나사를 내고저하는 위치에 구멍(2)을 천공한 후 구멍(2) 내면에 탭공구(3)를 사용하여 구멍의 내면을 따라 암나사(201)를 형성하는데, 이때 사용하는 탭공구는 피치의 간격이 목적하는 완성된 나사의 피치간격 보다 수축율만큼 증가하도록 확대되게 제작하게 된다.According to the present invention, after the hole 2 is drilled at the position where the internal thread is screwed into the first sintered first sintered material 1, the inner surface of the hole is used along the inner surface of the hole using the tap tool 3. The female thread 201 is formed, wherein the tap tool used is made to be enlarged so that the pitch interval increases by a shrinkage ratio than the pitch interval of the desired finished screw.

따라서 탭공구의 회전속도는 기존 탭공구의 회전속도(RPM 400정도) 보다 현저하게 낮은 저속회전(RPM 30-200회)으로 회전시키면서 피치를 성형하고 탭공구에는 공기주입공(4)과 배출공(401)을 성형하여 피치성형시에 피치사이에 발생하는 절삭체(202)을 외부로 배출시키면서 암나사를 성형하게 된다.Therefore, the rotation speed of the tapping tool is formed at a low rotational speed (RPM 30-200 times), which is significantly lower than the rotational speed of the conventional tapping tool (about RPM 400). The tapping tool has an air injection hole (4) and an exhaust hole. 401 is molded to form the female screw while discharging the cutting body 202 generated between the pitches at the time of pitch molding to the outside.

이때에는 탭공구(3)에 도2에서와 같이 공기주입공(4)과 배출공(401)을 성형하여 태핑작업과 병행하여 외부공기를 주입시켜도 좋고, 또한 탭공구 작업후 별도로 만든 청소기(5)를 태핑부에 투입하여 나사홈 사이에 잔류하고 있는 절삭칩(202)를 제거하여도된다.In this case, as shown in FIG. 2, the air injection hole 4 and the discharge hole 401 may be formed in the tap tool 3 to inject external air in parallel with the tapping operation. ) May be inserted into the tapping portion to remove the cutting chip 202 remaining between the screw grooves.

이것은 1차소결물의 암나사부에 성형된 암나사 표면에 소결물분말이 잔류하지 않게 하여 2차소결시 나사표면에 덧살이 성형되는 것을 방지하기 위해 실시되는 것으로 본원의 핵심기술의 하나에 해당하는 중요공정이다.This is carried out to prevent the sintered powder from forming on the surface of the female thread formed on the female threaded portion of the primary sintered material so as to prevent the extruding on the screw surface during the second sintering. to be.

이렇게하여 암나사가 성형되면 암나사가 형성된 1차소결물(1)을 2차소결로(진공로, 수소로)에 투입하여 1350-1500℃로 소결시켜 완성품으로 만들어지는 것이다.In this way, when the female screw is molded, the primary sintered product (1) having the female screw is introduced into a secondary sintering furnace (vacuum furnace, hydrogen furnace) and sintered at 1350-1500 ° C. to be made into a finished product.

이렇게하므로서 소결합금체에 성형되는 암나사는 목적하는 규격에 정확히 일치하는 암나사가 만들어지고 암나사 성형탭공구를 저속 회전시켜 피치를 형성하기 때문에 성형도중에 나사산이 손괴될 염려가 없이 정밀한 암나사성형이 가능케 된다.In this way, the female thread formed on the small-bonded metal body is made to exactly match the desired specification, and the female thread-molding tap tool is rotated at low speed to form a pitch, thereby enabling precise female thread molding without fear of screw breakage during molding.

이렇게하므로서 완전히 소결된 소결합금체에 특수장비를 사용하여 암나사를 내지않고 1차 성형되어 가공이 쉬운 소결물에 암나사를 내고 암나사를 낸 소결물을 2차 성형하여 완성품을 제조하므로 보다 적은 비용으로 압나사를 낼 수 있게 되어 초경소결제품을 실용화할 수 있는 이점을 얻는 것이다.In this way, the sintered compacted body is first molded without the use of special equipment on the fully sintered small-bonded metal body. It is possible to take out the screw to obtain the advantage of practically cemented carbide products.

Claims (3)

금속코발트 분말과 탄화텅스텐 분말의 환합물을 압착성형틀에 넣고 600-100Kg/cm2압력으로 성형하여 800℃전후에서 1차소결하고 1차소결물(1)에 암나사용 구멍(2)을 내고 구멍속에 저속회전 탭공구(3)를 투입하여 구멍내면에 암나사(201)를 성형하되 피치의 간격을 완성품의 피치간격보다 20-25%크게 확대된 규격으로 성형하고 나사홈을 깨끗하게 청소한 후 소결로(진공로 또는 수소로)에 넣어 1350-1500℃의 온도로 2차 소결시킴을 특징으로 하는 소결합금체의 암나사 성형방법Put the mixture of the metal cobalt powder and tungsten carbide powder into the pressing mold and molded at 600-100Kg / cm 2 pressure to sinter the first time around 800 ℃ and to make the female threaded hole (2) in the first sintered material (1). Insert the low-speed rotary tapping tool (3) into the hole to form the female screw 201 on the inner surface of the hole, but form a pitch gap 20-25% larger than the pitch gap of the finished product, clean the screw groove, and sinter it. A method of forming female threads of a small-bonded metal body characterized by sintering at a temperature of 1350-1500 ° C. in a furnace (vacuum furnace or hydrogen furnace). 상기 1항에서 암나사 성형에 사용하는 탭공구는 RPM 30-200 회전범위로 저속 회전시킴을 특징으로 하는 소결합금체의 암나사 성형방법The tapping tool used for female thread forming according to claim 1 is a female screw forming method of a small-bonded metal body characterized in that it rotates at a low speed in a range of RPM 30-200. 상기 1항에서 탭작업은 탭공구에 공기주입공(4)과 배출공(401)을 구비하여 암나사 작업시에 외부공기가 나사부에 공급되어 절삭칩(202)을 불어내도록 함을 특징으로 하는 상기 1항 기재의 소결합금체의 암나사 성형방법The tapping operation of claim 1 is characterized in that the tapping tool is provided with an air injection hole 4 and a discharge hole 401 in the tap tool so that external air is supplied to the screw part during the female threading operation to blow out the cutting chip 202. Female thread forming method of the non-bonded metal body described in Clause 1.
KR1019970023087A 1997-05-30 1997-05-30 Method for forming internal thread of sintered alloy body KR100225967B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105965023A (en) * 2016-07-08 2016-09-28 常熟市迅达粉末冶金有限公司 Vacuum sintering technology used for machining oxygen sensor nut
CN105965023B (en) * 2016-07-08 2018-01-12 常熟市迅达粉末冶金有限公司 For processing the vacuum sintering technology of lambda sensor nut

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