WO2022099627A1 - 提高冷拔变形量的复合模具 - Google Patents

提高冷拔变形量的复合模具 Download PDF

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Publication number
WO2022099627A1
WO2022099627A1 PCT/CN2020/128755 CN2020128755W WO2022099627A1 WO 2022099627 A1 WO2022099627 A1 WO 2022099627A1 CN 2020128755 W CN2020128755 W CN 2020128755W WO 2022099627 A1 WO2022099627 A1 WO 2022099627A1
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Prior art keywords
section
cold
cold drawing
sizing
die
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PCT/CN2020/128755
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English (en)
French (fr)
Inventor
杨琳
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盐城利盐新材料有限公司
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Priority to PCT/CN2020/128755 priority Critical patent/WO2022099627A1/zh
Publication of WO2022099627A1 publication Critical patent/WO2022099627A1/zh

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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
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof

Definitions

  • the utility model relates to the field of steel pipe drawing and forming mold manufacturing, in particular to a composite mold for increasing the amount of cold drawing deformation.
  • the traditional deformation drawing process has been used in the cold-drawing production of seamless steel pipes.
  • the cold-drawing outer mold used in the traditional cold-drawing process of seamless steel pipes generally adopts the following two types: 1.
  • the outer mold has a cold-drawing hole inside.
  • the cold-drawing hole is divided into an entrance section, a sizing section and an exit section in turn along the drawing direction of the steel pipe.
  • the cross-section of the entrance section is an arc structure because of its sizing.
  • the drawing section is relatively long. Although the deformation quality of the drawn steel pipe is good, the required drawing force increases, which takes a long time and the drawing efficiency is low, resulting in low production efficiency and high cost; 2.
  • the outer mold also known as the conical outer mold, is provided with a cold-drawing hole inside.
  • the cold-drawing hole is divided into an inlet section, a sizing section and an outlet section in turn along the drawing direction of the steel pipe.
  • the section of the inlet section is tapered. Because of the short sizing section, the drawing force required for the deformation of the steel pipe is small, and the natural efficiency is high. However, due to the short sizing section, the tail of the steel pipe shakes, the single-pass metal deformation elongation during drawing is small, and the drawing pass Many times, long production cycle, affecting the quality of steel pipe drawing.
  • the purpose of the present utility model is to provide a composite mold for increasing the amount of cold drawing deformation, so as to solve the problems raised in the above-mentioned background art.
  • a composite mold for increasing the amount of cold-drawing deformation includes a cold-drawing outer mold body, and a cold-drawing mold hole is provided in the cold-drawing outer mold body, and the cold-drawing mold hole is It is divided into an inlet section, a sizing section and an outlet section in turn along the drawing direction of the steel pipe, wherein the inlet section is formed by connecting an arc guide section and a linear clamping section, and the linear clamping section and the arc
  • the shape guide section is tangentially arranged, the diameter of the outer end of the inlet section is larger than that of the inner end, the outlet section is an inverted conical structure, and the two ends of the sizing section are respectively connected with the straight clamping section and the outlet section.
  • the arc guide section R is 10 to 30 mm.
  • the taper angle ⁇ of the straight clamping segment is 11° ⁇ 13°.
  • the sizing section is 10-15 mm.
  • the utility model reduces the angle between the two waists of the conical table surface of the cold-drawing die hole and lengthens the design of the sizing belt at the bottom of the die hole, thereby greatly improving the plastic deformation time and deformation of the stainless steel composite pipe during cold-drawing processing.
  • the residual stress of the outer thin-walled stainless steel tube of the stainless steel composite tube is basically eliminated, which not only improves the surface quality of the stainless steel composite tube after cold drawing, but also fundamentally eliminates the inner and outer layers of the stainless steel composite tube after cold drawing. There are tiny gaps between them, so that the two metals inside and outside the stainless steel composite pipe can be combined into one without gaps.
  • Fig. 1 is the structure schematic diagram of the conical outer mold in the prior art
  • Fig. 2 is a schematic diagram of the structure of an arc-shaped outer mold in the prior art
  • FIG. 3 is a schematic structural diagram of the cold-drawn outer mold of the utility model
  • Figure 4 is a detailed view of the cold-drawn outer mold of the utility model.
  • the terms “installation” and “connection” should be understood in a broad sense, for example, It can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. .
  • the specific meanings of the above terms in the present invention can be understood in specific situations.
  • FIG. 1 it is a prior art arc-shaped outer mold.
  • the cold-drawn outer mold body 1 is provided with a cold-drawn die hole.
  • the cold-drawn die hole is divided into an inlet section 2 and a sizing section 3 in turn along the drawing direction of the steel pipe.
  • the outlet section 4 because the sizing section 3 is relatively long, it is used for short mandrel drawing, and the diameter reduction in a single pass is 6-12mm, and the wall reduction is 0.5-1.2mm.
  • the prior art conical outer die is provided.
  • the cold-drawn outer die body 1 is provided with a cold-drawn die hole.
  • the cold-drawn die hole is sequentially divided into an inlet section 1, a sizing section 3 and a sizing section along the drawing direction of the steel pipe.
  • the exit section 4, because the sizing section 3 is short, is used for mandrelless drawing (commonly known as: air drawing), and the diameter reduction in a single pass is 5-13mm, without wall reduction.
  • the composite mold for increasing the amount of cold-drawing deformation includes a cold-drawing outer mold body 1.
  • the cold-drawing outer mold body 1 is provided with a cold-drawing die hole, and the cold-drawing die hole is along the drawing direction of the steel pipe. It is divided into an inlet section 2, a sizing section 3 and an outlet section 4 in turn.
  • the inlet section 2 is formed by connecting and combining the arc guide section 21 and the straight clamping section 22.
  • the arc guide section 21R10 ⁇ 30mm large diameter steel pipe R Take the larger value, and the small diameter steel pipe R takes the smaller value
  • the straight-line clamping section 22 is arranged tangentially to the arc-shaped guide section 21, and the taper angle ⁇ of the straight-line clamping section 22 is 11°-13°
  • the outer end of the inlet section 2 The diameter is larger than the inner end
  • the outlet section 4 is an inverted conical structure, both ends of the sizing section 3 are connected with the straight clamping section 22 and the outlet section 4, and the sizing section 3 is 10-15mm.
  • the diameter reduction in a single pass is 10 to 22 mm, and the wall reduction is 0.5 to 1.0 mm, which can achieve the sum of the deformations of the two molds in a single pass of cold drawing.
  • the angle between the two waists of the conical table surface of the cold-drawing die hole is reduced and the design of the sizing belt at the bottom of the die-hole is lengthened, which greatly improves the plastic deformation time and deformation of the stainless steel composite pipe during cold-drawing processing.
  • the residual stress of the outer thin-walled stainless steel tube of the stainless steel composite tube is basically eliminated, which not only improves the surface quality of the stainless steel composite tube after cold drawing, but also fundamentally eliminates the inner and outer layers of the stainless steel composite tube after cold drawing. There are tiny gaps between them, so that the two metals inside and outside the stainless steel composite pipe can be combined into one without gaps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)

Abstract

一种提高冷拔变形量的复合模具，包括：冷拔外模本体（1），冷拔外模本体（1）内设有冷拔模孔，冷拔模孔在沿钢管拉拔方向依次分为入口段（2）、定径段（3）及出口段（4）；其中，入口段（2）由弧形导向段（21）和直线夹持段（22）连接组合而成，直线夹持段（22）与弧形导向段（21）相切设置，入口段（2）的前端直径大于后端，出口段（4）为倒锥形结构，定径段（3）两端分别与直线夹持段（22）和出口段（4）相衔接。所述的复合模具将锥形外模与弧形外模形状复合于一体，获得了更大的冷拔变形量、减少冷拔道次从而降低钢管制造成本。

Description

提高冷拔变形量的复合模具 技术领域
本实用新型涉及钢管拉拔成型模具制造领域，具体为一种提高冷拔变形量的复合模具。
背景技术
无缝钢管在冷拔生产中一直沿用传统的变形拔制工艺，传统无缝钢管冷拔工艺中所采用的冷拔外模，一般采用以下两种：1、中式拔管外模，又称弧形外模，其内部设有冷拔模孔，冷拔模孔在沿钢管拉拔方向依次分为入口段、定径段及出口段，所述入口段的截面为弧形结构因其定径段相对较长，尽管拉拔钢管变形的质量较好，但其所需的拔制力增大了，耗费时间长，拉拔效率低，导致生产效率低，成本高；2、苏式拔管外模，又称锥形外模，内部设有冷拔模孔，冷拔模孔在沿钢管拉拔方向依次分为入口段、定径段和出口段，所述入口段的截面为锥形结构，因其定径段短，钢管变形所需拔制力小，自然效率就高，但是因定径段较短，钢管尾部抖动，拉拔时单道次金属变形延伸率小、拔制道次多、生产周期长，影响钢管拉拔的质量。综上所述采用上述两种冷拔外模本体允许每个拔制道次的延伸系数为1.2-1.6，由于每个拔制道次的拔制变形量比较小，导致拔制道次多、生产周期长、成本高、效率低，制约了钢管产能和产品竞争力的提高。
实用新型内容
本实用新型的目的在于提供提高冷拔变形量的复合模具，以解决上述背景技术中提出的问题。
为实现上述目的，本实用新型提供如下技术方案：提高冷拔变形量的复合模具，包括冷拔外模本体，所述冷拔外模本体内设有冷拔模孔，所述冷拔模孔 在沿钢管拉拔方向依次分为入口段、定径段及出口段，其中，所述入口段由弧形导向段和直线夹持段连接组合而成，所述直线夹持段与所述弧形导向段相切设置，所述入口段的外端直径大于内端，所述出口段为倒锥形结构，所述定径段两端分别与所述直线夹持段和出口段相衔接。
优选的，所述弧形导向段R10～30mm。
优选的，所述直线夹持段的锥角α11°～13°。
优选的，所述定径段为10～15mm。
与现有技术相比，本实用新型的有益效果是：
本实用新型通过对冷拔模孔锥形台面两腰之间的夹角进行了减小并加长了模孔底部定径带设计，大大提高了不锈钢复合管冷拔加工时的塑性变形时间和变形量，使得不锈钢复合管外层薄壁不锈钢管回复变形残余应力基本消除，不仅提高了不锈钢复合管冷拔加工后的表面质量，而且从根本上消除了不锈钢复合管冷拔加工后内外两层金属间微小缝隙，使不锈钢复合管内外两种金属之间达到无隙复合成为一体。
附图说明
图1为现有技术中锥形外模结构示意图；
图2为现有技术中弧形外模结构示意图；
图3为本实用新型冷拔外模结构示意图；
图4为本实用新型冷拔外模细节图。
具体实施方式
附图仅用于示例性说明，不能理解为对本专利的限制；为了更好说明本实施例，附图某些部件会有省略、放大或缩小，并不代表实际产品的尺寸；对于本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的。 在本实用新型的描述中，需要理解的是，在本实用新型的描述中，除非另有说明，“多个”的含义是两个或两个以上。在本实用新型的描述中，需要理解的是，在本实用新型的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以是通过中间媒介间接连接，可以说两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本实用新型的具体含义。
下面结合附图和实施例对本实用新型的技术方案做进一步的说明。
如附图1所示为现有技术弧形外模，冷拔外模本体1内设有冷拔模孔，冷拔模孔在沿钢管拉拔方向依次分为入口段2、定径段3及出口段4，因其定径段3相对较长，用于短芯棒拔制，单道次减径量6～12mm、减壁量0.5～1.2mm。
如图2所示为现有技术锥形外模，冷拔外模本体1内设有冷拔模孔，冷拔模孔在沿钢管拉拔方向依次分为入口段1、定径段3和出口段4，因其定径段3短，用于无芯棒拔制(俗称：空拔)，单道次减径量5～13mm、无减壁。
如附图3、4所示，提高冷拔变形量的复合模具，包括冷拔外模本体1，冷拔外模本体1内设有冷拔模孔，冷拔模孔在沿钢管拉拔方向依次分为入口段2、定径段3及出口段4，其中，入口段2由弧形导向段21和直线夹持段22连接组合而成，弧形导向段21R10～30mm(大直径钢管R取较大值，小直径钢管R取较小值)；直线夹持段22与弧形导向段21相切设置，直线夹持段22的锥角α11°～13°；入口段2的外端直径大于内端，出口段4为倒锥形结构，定径段3两端与直线夹持段22和出口段4相衔接，定径段3为10～15mm。
本实施例单道次减径量10～22mm、减壁量0.5～1.0mm，可以达到两种模具分别进行单道次冷拔变形量的总和。
本实施例通过对冷拔模孔锥形台面两腰之间的夹角进行了减小并加长了模孔底部定径带设计，大大提高了不锈钢复合管冷拔加工时的塑性变形时间和变形量，使得不锈钢复合管外层薄壁不锈钢管回复变形残余应力基本消除，不仅提高了不锈钢复合管冷拔加工后的表面质量，而且从根本上消除了不锈钢复合管冷拔加工后内外两层金属间微小缝隙，使不锈钢复合管内外两种金属之间达到无隙复合成为一体。
上述实施例只为说明本实用新型的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本实用新型的内容并据以实施，并不能以此限制本实用新型的保护范围，凡根据本实用新型精神实质所作的等效变化或修饰，都应涵盖在本实用新型的保护范围之内。

Claims (4)

  1. 提高冷拔变形量的复合模具，包括冷拔外模本体(1)，所述冷拔外模本体(1)内设有冷拔模孔，所述冷拔模孔在沿钢管拉拔方向依次分为入口段(2)、定径段(3)及出口段(4)，其特征在于：所述入口段(2)由弧形导向段(21)和直线夹持段(22)连接组合而成，所述直线夹持段(22)与所述弧形导向段(21)相切设置，所述入口段(2)的外端直径大于内端，所述出口段(4)为倒锥形结构，所述定径段(3)两端分别与所述直线夹持段(22)和出口段(4)相衔接。
  2. 根据权利要求1所述的提高冷拔变形量的复合模具，其特征在于：所述弧形导向段(21)R10～30mm。
  3. 根据权利要求1所述的提高冷拔变形量的复合模具，其特征在于：所述直线夹持段(22)的锥角α11°～13°。
  4. 根据权利要求1所述的提高冷拔变形量的复合模具，其特征在于：所述定径段(3)为10～15mm。
PCT/CN2020/128755 2020-11-13 2020-11-13 提高冷拔变形量的复合模具 WO2022099627A1 (zh)

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JP2000107806A (ja) * 1998-10-02 2000-04-18 Ngk Spark Plug Co Ltd 熱間加工用工具
CN201291240Y (zh) * 2008-10-21 2009-08-19 株洲力洲硬质合金有限公司 高速拉拔拉伸模的孔型结构
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JP2011031288A (ja) * 2009-08-05 2011-02-17 Kobe Steel Ltd 引抜ダイスおよびそれを用いた金属管の製造方法
CN102606333A (zh) * 2012-04-01 2012-07-25 常熟市异型钢管有限公司 柴油机缸套管以及其加工方法、加工模具
CN202447407U (zh) * 2012-02-27 2012-09-26 上海奉贤钢管厂 一种冷拔钢管专用模具
CN203751013U (zh) * 2014-03-14 2014-08-06 迟洪波 一种无缝钢管的冷拔外模及冷拔模具
CN104741400A (zh) * 2015-04-13 2015-07-01 江苏华程工业制管股份有限公司 一种矩形异型钢管不等边空拔模

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000107806A (ja) * 1998-10-02 2000-04-18 Ngk Spark Plug Co Ltd 熱間加工用工具
CN201291240Y (zh) * 2008-10-21 2009-08-19 株洲力洲硬质合金有限公司 高速拉拔拉伸模的孔型结构
JP2011031288A (ja) * 2009-08-05 2011-02-17 Kobe Steel Ltd 引抜ダイスおよびそれを用いた金属管の製造方法
CN101708507A (zh) * 2009-12-05 2010-05-19 衡阳华菱钢管有限公司 冷拔钢管复合外模
CN202447407U (zh) * 2012-02-27 2012-09-26 上海奉贤钢管厂 一种冷拔钢管专用模具
CN102606333A (zh) * 2012-04-01 2012-07-25 常熟市异型钢管有限公司 柴油机缸套管以及其加工方法、加工模具
CN203751013U (zh) * 2014-03-14 2014-08-06 迟洪波 一种无缝钢管的冷拔外模及冷拔模具
CN104741400A (zh) * 2015-04-13 2015-07-01 江苏华程工业制管股份有限公司 一种矩形异型钢管不等边空拔模

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