TW201618869A - Manufacturing method of steel section bar, extrusion device, and steel billet - Google Patents
Manufacturing method of steel section bar, extrusion device, and steel billet Download PDFInfo
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- TW201618869A TW201618869A TW103141459A TW103141459A TW201618869A TW 201618869 A TW201618869 A TW 201618869A TW 103141459 A TW103141459 A TW 103141459A TW 103141459 A TW103141459 A TW 103141459A TW 201618869 A TW201618869 A TW 201618869A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/21—Presses specially adapted for extruding metal
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Abstract
Description
本發明是有關於一種鋼製型材之製造方法、擠型裝置及鋼製擠錠，且特別是有關於一種鋼製型材之製造方法，使一中空鋼製擠錠能一次擠製成形至一鋼製型材所需形狀。 The invention relates to a method for manufacturing a steel profile, an extrusion device and a steel extrusion, and in particular to a method for manufacturing a steel profile, which can make a hollow steel extrusion can be extruded into one steel at a time. The shape required for the profile.
擠型是指將材料透過擠壓方式成形，其原理是將擠壓材/鋼製擠錠藉由適度加熱並加壓，等速度或變速度擠入模具來製成所需形狀、尺寸及物理性的產品，因此適合易塑形之金屬及塑料之加工。 Extrusion refers to the formation of a material by extrusion. The principle is to extrude the extruded material/steel extrusion into a desired shape, size and physics by moderately heating and pressurizing, and then squeezing into the mold at a constant speed or variable speed. Sexual products are therefore suitable for the processing of easily shaped metals and plastics.
目前線性滑軌市場，除了少數大型滑軌因考量輕量而以鋁合金替代外，現今多數的線性滑軌仍以鋼材為主。然而，目前鋼製型材之製造方法，滑軌底座多以輥軋或冷間抽製等多道次的循環程序並須要反覆地退火才能取得滑軌底座的成型件；滑塊則以鍛造或機械加工取得，材料使用率低落且加工費用高昂。 At present, in the linear slide rail market, except for a few large slide rails, which are replaced by aluminum alloys due to the consideration of lightweight, most of the linear slide rails are still mainly steel. However, in the current manufacturing method of steel profiles, the slide rail base is often subjected to a multi-pass cycle process such as rolling or cold drawing, and needs to be repeatedly annealed to obtain a molded part of the slide rail base; the slider is forged or mechanically Processing is achieved, material usage is low and processing costs are high.
因此，便有需要提供一種鋼製型材之製造方法，能夠解決前述的問題。 Therefore, there is a need to provide a method of manufacturing a steel profile that solves the aforementioned problems.
本發明之一目的是提供一種鋼製型材之製造方法，使一中空鋼製擠錠能一次擠製成形至一鋼製型材所需形狀，其擠製成形時之材料變形量小。 SUMMARY OF THE INVENTION One object of the present invention is to provide a method for producing a steel profile in which a hollow steel extruded ingot can be extruded into a desired shape to a steel profile at a time, and the amount of deformation of the material when extruded into a shape is small.
依據上述之目的，本發明提供一種鋼製型材之製造方法，包含下列步驟：提供一鋼製擠錠，其中該鋼製擠錠包含一中空內部及一潤滑劑，該潤滑劑充填於該中空內部內；加熱該鋼製擠錠；將該鋼製擠錠推動至一待擠壓位置；穿刺該鋼製擠錠之中空內部；以及擠壓該鋼製擠錠而使該鋼製擠錠擠製成形為該鋼 製型材。 According to the above object, the present invention provides a method for producing a steel profile, comprising the steps of: providing a steel ingot, wherein the steel ingot comprises a hollow interior and a lubricant, the lubricant being filled in the hollow interior Heating the steel ingot; pushing the steel ingot to a position to be pressed; piercing the hollow interior of the steel ingot; and extruding the steel ingot to extrude the steel ingot Formed into the steel Profiles.
本發明之鋼製型材之製造方法藉由該鋼製型材之內凹剖面形狀，將該鋼製擠錠設計為中空，可使該鋼製擠錠能一次擠製成形至該鋼製型材所需形狀(擠製成形時之材料變形量小)，達到減少材料耗損及後續加工道次之效益，未來可應用於工具機及半導體設備等產業所需之線性滑軌組件，以及抽屜滑軌所需之軌條零件。 The method for producing a steel profile of the present invention is designed to be hollow by the concave cross-sectional shape of the steel profile, so that the steel extrusion can be extruded into the steel profile at one time. Shape (small amount of material deformation when extrusion molding), to reduce the material loss and subsequent processing pass, the future can be applied to the linear slide components required by the tool machine and semiconductor equipment industry, as well as the drawer slide Rail parts.
100‧‧‧擠型設備 100‧‧‧Extrusion equipment
110‧‧‧盛錠筒 110‧‧‧Ingots
120‧‧‧擠壓桿 120‧‧‧Extrusion rod
122‧‧‧第一動力源 122‧‧‧First power source
124‧‧‧第一方向 124‧‧‧First direction
130‧‧‧穿心桿 130‧‧‧through the heart
132‧‧‧第二動力源 132‧‧‧second power source
134‧‧‧第二方向 134‧‧‧second direction
140‧‧‧擠壓模具 140‧‧‧Extrusion mould
142‧‧‧出口 142‧‧ Export
200‧‧‧鋼製擠錠 200‧‧‧Steel ingots
200’‧‧‧鋼製擠錠 200'‧‧‧Steel ingots
202‧‧‧中空內部 202‧‧‧ hollow interior
204‧‧‧潤滑劑 204‧‧‧Lubricant
206‧‧‧端板 206‧‧‧End plate
250‧‧‧鋼製型材 250‧‧‧Steel profiles
S100~S140‧‧‧步驟 S100~S140‧‧‧Steps
圖1為本發明之一實施例之擠型設備之剖面示意圖。 1 is a schematic cross-sectional view of an extrusion apparatus according to an embodiment of the present invention.
圖2a及2b為本發明之一實施例之鋼製擠錠之剖面及立體示意圖。 2a and 2b are cross-sectional and perspective views of a steel extruded ingot according to an embodiment of the present invention.
圖3a及3b為本發明之另一實施例之鋼製擠錠之剖面及立體示意圖。 3a and 3b are cross-sectional and perspective views of a steel extruded ingot according to another embodiment of the present invention.
圖4為本發明之一實施例之鋼製型材之製造方法的流程圖。 4 is a flow chart showing a method of manufacturing a steel profile according to an embodiment of the present invention.
圖5為本發明之一實施例之鋼製型材之製造方法的剖面示意圖，其顯示將該鋼製擠錠推動至一待擠壓位置。 Figure 5 is a schematic cross-sectional view showing a method of manufacturing a steel profile according to an embodiment of the present invention, showing that the steel ingot is pushed to a position to be pressed.
圖6為本發明之一實施例之鋼製型材之製造方法的剖面示意圖，其顯示穿刺該鋼製擠錠之中空內部。 Fig. 6 is a schematic cross-sectional view showing a method of manufacturing a steel profile according to an embodiment of the present invention, showing a hollow interior of the steel extrusion.
圖7為本發明之一實施例之鋼製型材之製造方法的剖面示意圖，其顯示擠壓該鋼製擠錠而使該鋼製擠錠擠製成形為該鋼製型材。 Figure 7 is a schematic cross-sectional view showing a method of manufacturing a steel profile according to an embodiment of the present invention, showing that the steel extrusion is extruded to form the steel extrusion into the steel profile.
圖8為沿圖7之擠型設備沿剖線A-A’之剖面示意圖。 Figure 8 is a cross-sectional view along the line A-A' of the extrusion apparatus of Figure 7.
圖9為本發明之一實施例鋼製擠錠及鋼製型材及先前技術之鋼製擠錠及鋼製型材的剖面示意圖。 Figure 9 is a cross-sectional view showing a steel extruded ingot and steel profile and a prior art steel extruded ingot and steel profile in accordance with one embodiment of the present invention.
圖10為本發明之另一實施例鋼製擠錠及鋼製型材及先前技術之鋼製擠錠及鋼製型材的剖面示意圖。 Figure 10 is a cross-sectional view showing a steel extruded ingot and steel profile and a prior art steel extruded ingot and steel profile according to another embodiment of the present invention.
為讓本發明之上述目的、特徵和特點能更明顯易懂，茲 配合圖式將本發明相關實施例詳細說明如下。 In order to make the above objects, features and features of the present invention more obvious, The related embodiments of the present invention will be described in detail below with reference to the drawings.
圖1為本發明之一實施例之擠型設備之剖面示意圖。該擠型設備100包含一盛錠筒110(container)、一擠壓桿120(ram)、一穿心桿130(mandrel)及一擠壓模具140(die)。該盛錠筒110用以置放一鋼製擠錠200(steel billet)。該擠壓桿120可相對於該盛錠筒110前進或退後運動，用以推動及擠壓該鋼製擠錠200。該擠壓桿120可包含一壓餅(dummy)(圖未示)，用以接觸該鋼製擠錠200。該穿心桿130可相對於該盛錠筒110前進或退後運動，用以穿刺該鋼製擠錠200之中空內部202。該擠壓模具140固設於該盛錠筒110。當該擠壓桿120擠壓該鋼製擠錠200時，該鋼製擠錠200根據該擠壓模具140之出口142剖面形狀而擠製成形為一鋼製型材。 1 is a schematic cross-sectional view of an extrusion apparatus according to an embodiment of the present invention. The extrusion apparatus 100 includes a container 110, a squeeze bar 120, a mandrel 130, and a die 140. The spindle 110 is used to place a steel billet 200. The squeeze bar 120 is movable forward or backward relative to the spindle 110 for pushing and pressing the steel extrusion 200. The squeeze bar 120 can include a dummy (not shown) for contacting the steel extrudate 200. The penetrating rod 130 is movable forward or backward relative to the barrel 110 for piercing the hollow interior 202 of the steel ingot 200. The extrusion die 140 is fixed to the spindle tube 110. When the extrusion bar 120 presses the steel ingot 200, the steel ingot 200 is extruded into a steel profile according to the cross-sectional shape of the outlet 142 of the extrusion die 140.
在本實施例中，參考圖2a及2b，該鋼製擠錠200為中空圓形柱狀。或者，在另一實施例中，參考圖3a及3b，該鋼製擠錠200為中空方形柱狀。該鋼製擠錠200包含一中空內部202及一潤滑劑204，例如玻璃系潤滑劑，充填於該中空內部202內。在本實施例中，該鋼製擠錠200之中空內部202可藉由例如機械加工製程(例如鑽孔製程)而預先成形，該中空內部202可以但不限為圓孔狀，該鋼製擠錠200更包含兩端板206(例如鋼薄板)固接(例如焊接或黏接)於其兩側，使該潤滑劑204密封於該中空內部202內，以避免高溫脫落。該鋼製擠錠200之材料可為鐵材或碳鋼，例如低碳鋼SS41或中碳鋼S45C(但不限定於此)。 In the present embodiment, referring to Figures 2a and 2b, the steel ingot 200 is in the form of a hollow circular column. Alternatively, in another embodiment, referring to Figures 3a and 3b, the steel ingot 200 is in the form of a hollow square column. The steel ingot 200 includes a hollow interior 202 and a lubricant 204, such as a glass based lubricant, that is filled into the hollow interior 202. In the present embodiment, the hollow interior 202 of the steel extrusion 200 can be pre-formed by, for example, a machining process (eg, a drilling process), which can be, but is not limited to, a circular hole, the steel extrusion The ingot 200 further includes two end plates 206 (eg, steel sheets) that are fixed (eg, welded or bonded) to both sides thereof to seal the lubricant 204 within the hollow interior 202 to avoid high temperature shedding. The material of the steel ingot 200 may be iron or carbon steel, such as low carbon steel SS41 or medium carbon steel S45C (but is not limited thereto).
圖4為本發明之一實施例之鋼製型材之製造方法的流程圖。該鋼製型材之製造方法，包含下列步驟： 在步驟S100中，提供一鋼製擠錠，該鋼製擠錠包含一中空內部，該中空內部充填有一潤滑劑。在本實施例中，該鋼製擠錠200包含一中空內部202及一潤滑劑204，該潤滑劑204充填於該中空內部202內，該潤滑劑204可為玻璃系潤滑劑，如圖2a及2b所示。 4 is a flow chart showing a method of manufacturing a steel profile according to an embodiment of the present invention. The method for manufacturing the steel profile comprises the following steps: In step S100, a steel ingot is provided, the steel ingot comprising a hollow interior filled with a lubricant. In this embodiment, the steel extrusion 200 includes a hollow interior 202 and a lubricant 204. The lubricant 204 is filled in the hollow interior 202. The lubricant 204 can be a glass-based lubricant, as shown in FIG. 2a. 2b is shown.
在步驟S110中，加熱該鋼製擠錠。詳言之，對該鋼製擠錠200進行熱處理程序(heat treatment process)，可改變該鋼製擠錠200的材料特性，使之可成為易於加工的狀態。例如，於此實施例中，該鋼製擠錠200可為碳鋼，其經由熱處理程序後，可被加熱至約1150℃，以利後續之擠製成形。 In step S110, the steel ingot is heated. In detail, the heat treatment process of the steel ingot 200 can change the material properties of the steel ingot 200 to make it easy to process. For example, in this embodiment, the steel ingot 200 can be carbon steel that can be heated to about 1150 ° C after a heat treatment procedure to facilitate subsequent extrusion.
在步驟S120中，將該鋼製擠錠推動至一待擠壓位置。在本實施例中，參考圖5，將鋼製擠錠200放置於一盛錠筒110內，並以一擠壓桿120推動該鋼製擠錠200至該待擠壓位置。該擠壓桿120可藉由一第一動力源122沿一第一方向124而被驅動。 In step S120, the steel ingot is pushed to a position to be pressed. In the present embodiment, referring to Fig. 5, the steel ingot 200 is placed in a spindle 110 and the steel extrusion 200 is pushed by a pressing rod 120 to the position to be pressed. The squeeze bar 120 can be driven in a first direction 124 by a first power source 122.
在步驟S130中，穿刺該鋼製擠錠之中空內部。在本實施例中，參考圖6，以一穿心桿130穿刺該鋼製擠錠200之中空內部202，並將該穿心桿130到達一固定位置，使該潤滑劑204覆蓋該穿心桿130。該穿心桿130可藉由一第二動力源132沿一第二方向134而被驅動。就具有該中空內部202之鋼製擠錠200及該穿心桿130之組合設計而言，該潤滑劑204可減少摩擦並增加潤滑效果，以避免後續擠製成形的製程時，該穿心桿130發生斷裂。 In step S130, the hollow interior of the steel ingot is pierced. In the present embodiment, referring to FIG. 6, the hollow inner portion 202 of the steel extrusion 200 is pierced by a penetrating rod 130, and the penetrating rod 130 is brought to a fixed position, so that the lubricant 204 covers the penetrating rod. 130. The penetrating rod 130 can be driven in a second direction 134 by a second power source 132. In the combined design of the steel extrusion 200 having the hollow interior 202 and the penetrating rod 130, the lubricant 204 can reduce friction and increase the lubricating effect to avoid the subsequent extrusion process. 130 has broken.
在步驟S140中，擠壓該鋼製擠錠而使該鋼製擠錠擠製成形為一鋼製型材。在本實施例中，參考圖7，該擠壓桿120可再次藉由該第一動力源122沿該第一方向124而被驅動，以該擠壓桿120擠壓該鋼製擠錠200，使該鋼製擠錠200根據一擠壓模具140之出口142剖面形狀而擠製成形為該鋼製型材250，如圖8所示。應說明的是，所述擠製成形(extrusion)的製程可包含例如，直接擠型、間接擠型或靜水壓擠型等，但不限定於此。 In step S140, the steel ingot is extruded to extrude the steel ingot into a steel profile. In this embodiment, referring to FIG. 7 , the squeeze bar 120 can be driven again in the first direction 124 by the first power source 122 , and the steel bar 200 is pressed by the squeeze bar 120 . The steel ingot 200 is extruded into the steel profile 250 according to the cross-sectional shape of the outlet 142 of an extrusion die 140, as shown in FIG. It should be noted that the extrusion process may include, for example, direct extrusion, indirect extrusion or hydrostatic extrusion, but is not limited thereto.
特別是當該鋼製型材用於製造線性滑軌(滑軌底座及滑塊)或抽屜滑軌時，該鋼製型材須具有內凹剖面形狀。在本實施例中，參考圖9，本發明由該鋼製擠錠200之中空圓形剖面形狀擠製成形為該鋼製型材250之內凹剖面形狀的材料變形量小於先 前技術由該鋼製擠錠200’之實心圓形剖面形狀擠製成形為該鋼製型材250之內凹剖面形狀的材料變形量。在另一實施例中，參考圖10，本發明由該鋼製擠錠200之中空方形剖面形狀擠製成形至該鋼製型材250之內凹剖面形狀的材料變形量小於先前技術由該鋼製擠錠200’之實心方形剖面形狀擠製成形至該鋼製型材250之內凹剖面形狀的材料變形量。 In particular, when the steel profile is used for the manufacture of linear slides (slide bases and slides) or drawer slides, the steel profile must have a concave cross-sectional shape. In the present embodiment, referring to FIG. 9, the present invention is extruded from the hollow circular cross-sectional shape of the steel extrusion 200 into a shape of a concave cross-sectional shape of the steel profile 250. The prior art is extruded from the solid circular cross-sectional shape of the steel ingot 200' into a material deformation amount in the concave cross-sectional shape of the steel profile 250. In another embodiment, referring to FIG. 10, the present invention is extruded from the hollow square cross-sectional shape of the steel extrusion 200 to a concave cross-sectional shape of the steel profile 250. The amount of material deformation is smaller than that of the prior art. The solid square cross-sectional shape of the extruded ingot 200' is extruded to the amount of material deformation of the concave cross-sectional shape of the steel profile 250.
因此，本發明之鋼製擠錠200的中空圓形剖面形狀或中空方形剖面形狀較容易擠製成形為該鋼製型材250之內凹剖面形狀(材料變形量小)。再者，雖然鋼製材料之剛性大於鋁製材料之剛性，但是當本發明之鋼製擠錠200的中空圓形剖面形狀或中空方形剖面形狀擠製成形為該鋼製型材250之內凹剖面形狀(材料變形量小)時，該擠壓模具140之出口142較不容易損壞，如圖8所示。 Therefore, the hollow circular cross-sectional shape or the hollow square cross-sectional shape of the steel ingot 200 of the present invention is more easily extruded into the concave cross-sectional shape of the steel profile 250 (the amount of material deformation is small). Furthermore, although the rigidity of the steel material is greater than the rigidity of the aluminum material, the hollow circular cross-sectional shape or the hollow square cross-sectional shape of the steel extrusion 200 of the present invention is extruded into a concave profile of the steel profile 250. When the shape (the amount of deformation of the material is small), the outlet 142 of the extrusion die 140 is less likely to be damaged, as shown in FIG.
本發明之鋼製型材之製造方法藉由該鋼製型材之內凹剖面形狀，將該鋼製擠錠設計為中空，可使該鋼製擠錠能一次擠製成形至該鋼製型材所需形狀(擠製成形時之材料變形量小)，達到減少材料耗損及後續加工道次之效益，未來可應用於工具機及半導體設備等產業所需之線性滑軌組件，以及抽屜滑軌所需之軌條零件。 The method for producing a steel profile of the present invention is designed to be hollow by the concave cross-sectional shape of the steel profile, so that the steel extrusion can be extruded into the steel profile at one time. Shape (small amount of material deformation when extrusion molding), to reduce the material loss and subsequent processing pass, the future can be applied to the linear slide components required by the tool machine and semiconductor equipment industry, as well as the drawer slide Rail parts.
本發明經由所設計之擠製成形的製程，可達成製造該鋼製型材之目的，並減少表面氧化及脫碳等缺陷產生。本發明之鋼製型材之製造方法可取代傳統以輥軋或抽製製程之製造方法，能大幅減少加工量及加工道次，以提供符合需求之線性滑軌組件及抽屜滑軌之軌條零件。 The invention achieves the purpose of manufacturing the steel profile through the designed extrusion process, and reduces defects such as surface oxidation and decarburization. The manufacturing method of the steel profile of the invention can replace the traditional manufacturing method of rolling or drawing process, and can greatly reduce the processing amount and the processing pass to provide the linear slide component and the slide rail of the drawer. .
綜上所述，乃僅記載本發明為呈現解決問題所採用的技術手段之較佳實施方式或實施例而已，並非用來限定本發明專利實施之範圍。即凡與本發明專利申請範圍文義相符，或依本發明專利範圍所做的均等變化與修飾，皆為本發明專利範圍所涵蓋。 In summary, the present invention is only described as a preferred embodiment or embodiment of the technical means for solving the problem, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made in accordance with the scope of the patent application of the present invention or the scope of the invention are covered by the scope of the invention.
100‧‧‧擠型設備 100‧‧‧Extrusion equipment
110‧‧‧盛錠筒 110‧‧‧Ingots
120‧‧‧擠壓桿 120‧‧‧Extrusion rod
130‧‧‧穿心桿 130‧‧‧through the heart
132‧‧‧第二動力源 132‧‧‧second power source
134‧‧‧第二方向 134‧‧‧second direction
140‧‧‧擠壓模具 140‧‧‧Extrusion mould
142‧‧‧出口 142‧‧ Export
200‧‧‧鋼製擠錠 200‧‧‧Steel ingots
202‧‧‧中空內部 202‧‧‧ hollow interior
204‧‧‧潤滑劑 204‧‧‧Lubricant
Claims (10)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103141459A TW201618869A (en) | 2014-11-28 | 2014-11-28 | Manufacturing method of steel section bar, extrusion device, and steel billet |
| CN201510808037.1A CN105642690A (en) | 2014-11-28 | 2015-11-20 | Method for manufacturing steel section, extrusion device and steel extrusion ingot |
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| Application Number | Priority Date | Filing Date | Title |
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| TW103141459A TW201618869A (en) | 2014-11-28 | 2014-11-28 | Manufacturing method of steel section bar, extrusion device, and steel billet |
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| TW201618869A true TW201618869A (en) | 2016-06-01 |
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| TWI706817B (en) * | 2019-12-09 | 2020-10-11 | 財團法人金屬工業研究發展中心 | Extrusion device and extrusion method thereof |
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| CN112974558B (en) * | 2019-12-13 | 2023-03-21 | 财团法人金属工业研究发展中心 | Extrusion apparatus, extrusion method thereof and product thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3039888A (en) * | 1959-03-27 | 1962-06-19 | Cefilac | Method of coating the bore of a heated hollow billet with glass-like lubricating material prior to extrusion of hollow articles |
| US3118540A (en) * | 1960-04-26 | 1964-01-21 | Kronprinz Ag | Apparatus for lubricationg of hot extruding of metal ingots |
| JPS5522469A (en) * | 1978-08-05 | 1980-02-18 | Kobe Steel Ltd | High temperature lubricating and extruding method of tubular body |
| JP3097359B2 (en) * | 1992-11-30 | 2000-10-10 | 住友金属工業株式会社 | Hot extrusion pipe making method |
| JPH06269844A (en) * | 1993-03-18 | 1994-09-27 | Sumitomo Metal Ind Ltd | Billet for hot extruding tube making |
| CN1507962A (en) * | 2002-12-18 | 2004-06-30 | 中国科学院金属研究所 | High-temperature alloy tube billet working method |
| CN103752630A (en) * | 2013-12-27 | 2014-04-30 | 广州有色金属研究院 | Preparation method of variable cross-section aluminum alloy drill rod pipe body |
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| TWI706817B (en) * | 2019-12-09 | 2020-10-11 | 財團法人金屬工業研究發展中心 | Extrusion device and extrusion method thereof |
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