KR20010001937A - A forging mathod for pipe-connection - Google Patents
A forging mathod for pipe-connection Download PDFInfo
- Publication number
- KR20010001937A KR20010001937A KR1019990021452A KR19990021452A KR20010001937A KR 20010001937 A KR20010001937 A KR 20010001937A KR 1019990021452 A KR1019990021452 A KR 1019990021452A KR 19990021452 A KR19990021452 A KR 19990021452A KR 20010001937 A KR20010001937 A KR 20010001937A
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- KR
- South Korea
- Prior art keywords
- forging
- molding
- mold
- pipe
- type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 238000005242 forging Methods 0.000 title claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000012778 molding material Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 11
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 238000003672 processing method Methods 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 210000002310 elbow joint Anatomy 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000009497 press forging Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- B21K1/14—Making machine elements fittings
- B21K1/16—Making machine elements fittings parts of pipe or hose couplings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/12—Forming profiles on internal or external surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
- F16L19/08—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts with metal rings which bite into the wall of the pipe
- F16L19/10—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts with metal rings which bite into the wall of the pipe the profile of the ring being altered
- F16L19/14—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts with metal rings which bite into the wall of the pipe the profile of the ring being altered the rings being integral with one of the connecting parts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forging (AREA)
Abstract
본 발명은 주로 각종 가스관, 수도관등 유체관을 연결접속하는 이음관의 단조방법을 종래의 공지된 기술수단보다 개선하여 단조작업의 능률성, 양산성, 경제성, 에너지절약 효과를 달성하기 위한 기술적 구성을 제공코져 함에 목적이 있는 것으로서, 비철금속제의 성형소재를 예열하여 관체이음구로서 단조성형하는 일반적 가공방법에 있어서, 성형소재(2)를 성형제품의 형태(L형, T형, ㅡ형)와 두께(w,w')에 근접한 형태로 예비가공하고 이 예비성형소재(2)를 금형실(4)에 넣어 단조성형함을 특징으로 하는데 요지가 있다.The present invention mainly improves the forging method of the joint pipe connecting various fluid pipes such as gas pipes, water pipes, etc. compared with the conventional known technical means to achieve the efficiency, mass production, economic efficiency, energy saving effect of the forging operation In the general processing method of preheating non-ferrous metal molding material and forging molding as pipe fittings, the molding material 2 is formed into the shape (L-type, T-type and -type) and thickness of the molded product. The present invention is characterized in that it is pre-processed in a form close to (w, w '), and the preformed material 2 is placed in a mold chamber 4 to be forged.
Description
본 발명은 주로 각종 가스관, 수도관등 유체관을 연결접속하는 이음관의 단조방법을 종래의 공지된 기술수단보다 개선하여 단조작업의 능률성, 양산성, 경제성, 에너지절약 효과를 달성하기 위한 기술적 구성을 제공코져 함에 목적이 있다.The present invention mainly improves the forging method of the joint pipe connecting various fluid pipes such as gas pipes, water pipes, etc. compared with the conventional known technical means to achieve the efficiency, mass production, economic efficiency, energy saving effect of the forging operation The purpose is to provide.
구체적으로 본 발명의 특징은 비철금속제로 가열단조하는 단조기의 가공에 있어서, 소요재료의 절약, 불량품 발생률의 감소, 단조 프레스기의 동력절감으로 인한 경제성과 양산성을 도모코져 하는 것이다.Specifically, the characteristics of the present invention is to improve the economics and mass productivity of the forging machine for heating by forging made of non-ferrous metal, saving the required materials, reducing the incidence of defective products, power saving of the forging press machine.
종래의 엘보관, T형관, 유니온관등의 관이음구는 황동, 주석등 비철금속재료를 700~800℃의 고온으로 가열하여 자료의 가소성(可塑性)을 높인 다음 이를 3차원 단조기(금형의 가압단조와 더불어 측면에 가동핀을 출몰시켜 관체 이음관으로서 요구되는 외형과 내부의 관로(管路)를 개설하는 작업을 동시에 성형하는 기계를 통칭한다)를 이용하여 1회 프레싱과정에서 이음관체의 개략적인 외형상을 단조가공하고 나서 금형의 접촉면에서 생기는 잔유박엽편(통상 단조나 다이케스팅과정에서 금형압력에 의해 성형제품의 가장자리에 내측재료가 밀려나와 돌출되는 얇은 박편으로서 이를 통칭하여 "바리"라고 불리운다. 이하에는 로스편(LOSS片)이라 칭한다)을 커팅수단으로 제거하고, 이어서 소재의 양단에 나사텝핑작업(체결너트를 결합하는 나사형성작업)과 관체내경을 필요한 규격사양으로 천공작업한 다음 최종적으로 이음구의 외부를 쇼트볼 가공하여 외관상품미를 부여하게 된다Conventional elbows, T-shaped pipes, union pipes, etc. are used to heat non-ferrous metal materials such as brass and tin to a high temperature of 700 ~ 800 ℃ to increase the plasticity of the materials, and then use them for three-dimensional forging machines (press forging and In addition, by using the movable pin on the side, a machine that simultaneously forms the work required to open the external pipe and the internal pipe required as a pipe joint pipe) is used. Residual foil leaf that occurs at the contact surface of the mold after forging the shape (usually a thin flake that pushes the inner material to the edge of the molded product due to the mold pressure during the forging or die casting process, commonly referred to as "bari"). And a loss piece (called a loss piece) are removed by cutting means, and then screw-tapping operations (screwing operations for coupling fastening nuts) are applied to both ends of the material. After drilling the inner diameter of the pipe to the required specification, the outer part of the joint is short-balled to give the appearance product beauty.
그런데 이러한 종래의 이음구 단조방법에서 사용되는 소재는 도 3과 같이 비철금속계인 환봉재료를 고온 가열하여 단조하게 되므로 도 5에서 보는 바와 같이 상하 금형의 가압후에 잉여재료가 과다하게 측방으로 밀려나와 비교적 로스편5의 두께가 두껍고 넓은 면적에 걸쳐서 가공소재에 달라붙어 있게된다. 이는 차후 가공에 있어서, 로스편의 절단작업이 어렵고 절단물이 많이 노출되어 제품의 외관미가 조악하고, 절단 로스편의 과다산출로 인한 재료소모량이 증대하며 특히 금형의 성형실용량에 비하여 너무 큰 소재를 프레싱하므로 인해 금형가공 입력 즉 프레스 가공에 따른 에너지 소모가 커서 이를테면 하나의 금형에 여러개의 이음구를 동시에 단조하는 복수성형이 불가능하여 대부분 1회 단조작업에 이음관을 하나씩 밖에 성형할 수 없는 비능률성이 따랐다.By the way, the conventional materials used in the forging method of the conventional joint is forged by heating the non-ferrous metal round bar material as shown in FIG. 5 is thick and sticks to the workpiece over a large area. This is because in later processing, it is difficult to cut the loose pieces, expose the cut pieces a lot, so the appearance of the product is poor, the material consumption increases due to the excessive output of the cut loose pieces, and especially presses the material too large for the molding capacity of the mold. Due to the high energy consumption due to the input of mold processing, that is, press processing, for example, it is impossible to form multiple joints simultaneously forging several joints in one mold, and in most cases, only one joint tube can be formed in one forging operation. .
본 발명은 이에 착안하여 단조금형의 내부용량(부피)에 근접하는 용량의 소재를 제품의 형태와 흡사한 형태로 예비가공하여 이를 금형에 넣어 단조작업하므로서 단조작업 과정에서 로스편의 발생을 최소화시켜 제품의 생산성과 능률성 및 경제성의 목적을 달성하도록 한 것이다.The present invention focuses on this, preliminary processing the material of the capacity close to the internal capacity (volume) of the forging die in the form similar to the form of the product by putting it in the mold forging work to minimize the occurrence of loss pieces in the forging process To achieve the goals of productivity, efficiency and economics.
비철금속을 소재로 하는 단조작업을 수행함에 있어서는,In performing forging operations using non-ferrous metals,
금형의 형태와 용량에 따른 소재의 선택이 매우 중요하다. 가령 금형의 형태와 다른 형태의 가공소재나 금형의 용량보다 너무 큰 과잉의 소재를 단조재료로 선택하는 경우는 작업능률이 떨어지고 단조기의 프레싱 에너지 즉 동력소모가 크며 금형의 접촉면에 잉여소재가 옆으로 퍼져서 밀려나는 로스편의 발생량이 많으므로 성형제품에 비해 재료소모량이 많은 문제점이 따른다.The choice of material depends on the shape and capacity of the mold. For example, when selecting a forging material that is different from the die shape or processing material that is too large than the capacity of the mold, the work efficiency is lowered, the pressing energy of the forging machine, the power consumption is high, and the surplus material is placed on the contact surface of the mold. Since the amount of loss of loose pieces spread out by a large amount of material consumption compared to the molded product is a problem.
본 발명은 이러한 기술적 과제를 해결하기 위하여,The present invention to solve this technical problem,
단조금형의 형태와 내부용량에 매우 근접한 형태의 가공소재를 미리 예비성형하여 단조작업을 이행하므로서 제품의 단조 작업시 규격제품을 능률적으로 양산할 수 있도록 한 것이다.It is designed to efficiently produce the standard products during the forging work of the product by performing the forging work by preforming the processed material in the form of the forging mold and the shape which is very close to the internal capacity.
도 1a는 본 발명이 목적으로 하는 관이음쇠의 단조 성형상태도로서, 엘보관의 성형상태Figure 1a is a forged forming state diagram of the pipe fittings for the purpose of the present invention, the forming state of the elbow tube
도 1b는 본 발명이 목적으로 하는 관이음쇠의 단조 성형상태도로서, T형관의 성형상태Figure 1b is a forging molding state diagram of the pipe fittings for the purpose of the present invention, the forming state of the T-shaped tube
도 2a는 본 발명의 성형소재를 나타낸 것으로, 엘보관의 성형소재Figure 2a shows the molding material of the present invention, the molding material of the elbow
도 2b는 본 발명의 성형소재를 나타낸 것으로, T형관의 성형소재Figure 2b shows the molding material of the present invention, the molding material of the T-shaped tube
도 3은 종래의 관이음구의 성형소재 사시도3 is a perspective view of a molding material of a conventional pipe fitting
도 4a는 본 발명의 단조 상태를 단면으로 나타낸 것으로, 단조 전의 상태Figure 4a is a cross-sectional view showing the forging state of the present invention, the state before forging
도 4b는 본 발명의 단조 상태를 단면으로 나타낸 것으로, 단조 후의 상태Figure 4b is a cross-sectional view showing the forging state of the present invention, the state after forging
도 5a는 종래의 공지된 단조 상태 단면도로서, 단조 전의 상태Fig. 5A is a sectional view of a conventional known forging state, before the forging.
도 5b는 종래의 공재된 단조 상태 단면도로서, 단조 후의 상태Fig. 5B is a sectional view of a conventional forged steel state in the related art, after the forging.
도 6은 단조작업의 금형구성 및 단조상태를 나타낸 사시도Figure 6 is a perspective view showing the mold configuration and forging state of the forging operation
도 7은 단조 가공성형소재의 사시도7 is a perspective view of a forged molding material
☞ 도면의 주요부분에 대한 설명☜☞ Explanation of the main parts of the drawing ☜
1:엘보이음구 1a:T형이음구1: Elbow fitting 1a: T-shaped fitting
2:성형소재 2a:환봉형의 소재2: molding material 2a: round bar material
3:상부금형 3a:하부금형3: upper mold 3a: lower mold
4:금형실 5:로스편4: mold room 5: Ross
도 1은 본 발명의 단조방법을 성형하기 위하여 기존 관체이음관의 단조 상태를 예시한 것이다.Figure 1 illustrates the forging state of a conventional pipe joint for molding the forging method of the present invention.
엘보이음구1와 T형이음구1a를 단조 성형하는 기존의 방법은 도 3과 같이 제품의 성형형태에 구애받지 않고 어느것이든 비철금속제로된 환봉형의 성형소재2를 마련하여 이를 700~800℃로 예열시킨 다음 도 4와 같은 상부금형3과 하부금형3a사이에 형성된 금형실4 속에 넣어 프레싱 단조성형을 하게 된다.The existing method of forging the elbow joint 1 and the T-shaped joint 1a is prepared by round rod shaped material 2 made of non-ferrous metal, regardless of the molding form of the product as shown in Figure 3 and preheated to 700 ~ 800 ℃ Next, pressing forging is performed in the mold chamber 4 formed between the upper mold 3 and the lower mold 3a as shown in FIG. 4.
본 발명은 상기 단조성형공정에 있어서, 환봉형 성형소재2a를 공통소재로 하는 종래의 방법과는 달리 도2 및 7과같은 예비가공된 성형소재2를 사용하여 단조성형함을 특징으로 한다.The present invention is characterized in that in the forging molding process, unlike the conventional method in which the round bar-shaped molding material 2a is a common material, the forging is performed by using the preformed molding material 2 as shown in FIGS. 2 and 7.
본 발명의 성형소재2는 단조성형하고자 하는 엘보이음구1의 형태를 고려하여 미리 성형제품에 비교적 가까운 형태로 예비가공한다.The molding material 2 of the present invention is preliminarily processed into a shape relatively close to the molded product in consideration of the shape of the elbow fitting 1 to be forged.
즉 엘보이음관의 단조작업시에는 엘보관의 형태와 흡사한 L자형태, T형이음관의 단조작업시에는 T자형태, 유니온 이음관의 단조작업시에는 ㅡ 자형 상태로 가공한다.In other words, when forging work of elbow pipe, L-shape similar to the shape of elbow pipe, T-shape for forging work of T-shaped pipe, and --shape for forging work of union pipe.
가공방법은 도 7과 같이 L형 및 T형의 소재를 미리 가공한 후 일정두께로 커팅 제단하여 이를 가공소재로 한다.The processing method is to pre-process the L-type and T-type material as shown in Figure 7, and then cutting the cutting to a certain thickness to be a processing material.
소재의 두께는 성형제품의 외경과 비교하여 충분히 여유를 갖는 규격으로 성형한다.The thickness of the material is molded to a size with sufficient margin compared to the outer diameter of the molded product.
도 4는 본 발명방법에 의한 단조금형과 성형소재의 규격을 예시한다.Figure 4 illustrates the specifications of the forging die and the molding material according to the method of the present invention.
상부금형3과 하부금형3a에는 금형실4이 요설되어 있다. 이 금형실의 폭w과 성형소재의 폭w'은 거의 일치하나 구체적으로는 약간의 여유를 고려하여 금형실의 폭보다 성형소재의 직경이 큰(w'〉w)규격을 유지하는 것이 바람직하다.The mold chamber 4 is provided in the upper mold 3 and the lower mold 3a. Although the width w of the mold chamber and the width w 'of the molding material are substantially the same, it is preferable to maintain a size (w'> w) in which the diameter of the molding material is larger than the width of the mold chamber in consideration of some margin. .
이와 같이 가공제품의 형상에 근접립한 성형소재2를 금형실4에 넣고 단조성형작업을 하면 도 4의 a상태에서 b의 상태로 성형되는 데 이때 금형의 접촉부위에는 당연히 금형실4로 부터 여분의 소재가 측방으로 밀려나와 로스편5이 돌출 생성된다.As such, when the molding material 2 close to the shape of the processed product is placed in the mold chamber 4 and forged forming is performed in the state of FIG. 4 a to b, the contact portion of the mold is naturally spared from the mold chamber 4. The material of is pushed to the side, and the loose piece 5 protrudes.
도 5는 기존의 단조방법에 의한 성형장치의 예시도이다.5 is an exemplary view of a molding apparatus according to a conventional forging method.
도 4와 동일한 조건으로 상하금형3,3a사이에는 환봉형의 소재2a가 삽입되는데 이때의 성형소재의 직경w'은 금형실4의 폭w보다 매우 크지 않으면 안된다,Under the same conditions as in Fig. 4, between the upper and lower molds 3 and 3a, an annular rod-shaped material 2a is inserted, and the diameter w 'of the molding material at this time must be much larger than the width w of the mold chamber 4,
즉 엘보형, T형, 유니온형을 모두 커버하는 규격이 되어야 하므로 보통의 경우 성형소재2a로서 직경이 금형실4의 직경보다 2배이상인 경우가 많으므로 단조작업시 금형실로부터 밀려나오는 여분의 소재량이 많아 로스편5은 도 4와 같은 성형소재2를 쓰는 경우에 비해 수배이상 크게 발생하고 그 두께도 두꺼운 것이다.In other words, it should be a standard covering all elbow type, T type, and union type. In general, as the molding material 2a, the diameter is often more than twice the diameter of the mold chamber 4, so the extra material pushed out of the mold chamber during forging work. Loss piece 5 is much larger than the case of using molding material 2 as shown in FIG.
따라서 1차 완료작업이 로스편5을 제거하는 작업이 어렵고 제품의 외관미가 조악하며 또한 재료허실이 많은 것이다.Therefore, the first completed work is difficult to remove the loss piece 5, poor appearance of the product and a lot of material loss.
본 발명은 이상과 같이 이음관등 배관자재를 단조성형함에 있어서 성형금형3에 요설한 금형실4의 형태에 근접되도록 미리 성형소재2를 알맞은 형태와 규격으로 제조한 후 이를 이용하여 단조작업을 이행하는 바 본 발명은 다음과 같은 여러가지 유익한 효과를 수반한다.According to the present invention, in forging a pipe material such as a joint pipe as described above, the molding material 2 is manufactured to a suitable shape and size in advance so as to be close to the shape of the mold chamber 4 outlined in the molding die 3, and then forging operation is performed using the same. The present invention is accompanied by various beneficial effects as follows.
① 성형제품의 로스편5의 발생량이 적고 그 두께가 얇게 성형되므로 차후에 이를 제거하기 용이하며 제품의 외관이 미려하여 고품위를 유지할 수 있다.① It is easy to remove it in the future since the amount of loss piece 5 of molded product is formed and its thickness is thinly formed, and the appearance of the product is beautiful and high quality can be maintained.
② 단조 프레싱 압력소요가 종래에 비해 현저히 감소하므로 금형에 무리를 주지 낳아 그 수명이 길고, 특히 종래의 경우 1회 프레싱 공정에 단일의 제품을 성형하였던 비능률성이 해소되어 1회 프레싱공정에 2개 또는 그 이상의 동시 성형작업이 가능하여 제품의 양산성과 능률성이 보장된다.② Forging pressing pressure is considerably reduced compared with the conventional ones, which makes the mold unreasonable and its life is long. Especially, the inefficiency of forming a single product in one pressing process is eliminated. Three or more simultaneous forming operations are possible, ensuring mass production and efficiency.
③상기한 로스편의 감소는 성형재료의 절약효과를 가져오므로 소재당 제품완성률이 놓아 생산코스트가 절감된다.(3) The reduction of the above-mentioned loose pieces results in the saving effect of molding materials, resulting in a product completion rate per material, thus reducing the production cost.
④ 가공소재의 예비성형은 기존 환봉소재에 비해 그 가공비가 별로 높지 않으므로 제조 공정면에서도 크게 불리하지 않다.④ The preforming of processed materials is not very disadvantageous in terms of manufacturing process because the processing cost is not so high compared to existing round bar materials.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990021452A KR20010001937A (en) | 1999-06-09 | 1999-06-09 | A forging mathod for pipe-connection |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019990021452A KR20010001937A (en) | 1999-06-09 | 1999-06-09 | A forging mathod for pipe-connection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486532A (en) * | 2017-08-21 | 2017-12-19 | 柳州科尔特锻造机械有限公司 | The forging method of three-way piece |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486532A (en) * | 2017-08-21 | 2017-12-19 | 柳州科尔特锻造机械有限公司 | The forging method of three-way piece |
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