WO2021237815A1 - 一种钢质活塞锻造模具 - Google Patents

一种钢质活塞锻造模具 Download PDF

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WO2021237815A1
WO2021237815A1 PCT/CN2020/095880 CN2020095880W WO2021237815A1 WO 2021237815 A1 WO2021237815 A1 WO 2021237815A1 CN 2020095880 W CN2020095880 W CN 2020095880W WO 2021237815 A1 WO2021237815 A1 WO 2021237815A1
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Prior art keywords
forging die
die
forging
final
skirt
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PCT/CN2020/095880
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English (en)
French (fr)
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吴燕忠
吴家乐
李理
连泽鹏
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浙江跃进机械有限公司
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Publication of WO2021237815A1 publication Critical patent/WO2021237815A1/zh

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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
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • 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
    • B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like

Definitions

  • the invention relates to the field of die forging, in particular to a steel piston forging die.
  • the S31726 steel piston is difficult to form and has a short die life.
  • the complex structure of the piston can easily lead to folding, and a too deep and thin skirt can easily lead to lack of material; how to forge a S31726 steel piston with good forming performance and no defects after the forging is formed Mold has become a major technical problem in the industry
  • the technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a steel piston forging die with good forming performance and long service life.
  • a steel piston forging die two sets of relatively independent cylindrical dies including a pre-forging die and a final forging die;
  • the pre-forging die consists of a matching pre-forging upper die
  • the final forging die is composed of a matching upper final forging die and a lower final forging die;
  • the inner cavity of the pre-forging die and the final forging die is composed of a skirt, a core, and a combustion chamber.
  • the skirt The center of the bottom of the part is provided with a pine nut hole matching the push rod of the casting machine; the upper pre-forging die and the lower pre-forging die are respectively provided with matching and interconnected upper die blocking grooves and lower die blocking grooves, Matching flash grooves are also provided between the upper and lower molds of the pre-forging die and the final forging die;
  • the combustion chamber is matched and connected; in the final forging die, the flash groove is matched and communicated with the combustion chamber; the flash groove size of the final forging die is larger than the flash groove size of the pre-forging die, and the skirt depth of the lower pre-forging die is smaller than The depth of the skirt of the lower final forging die, the upper part of the core of the pre-forging die is consistent with the upper part of the core of the final forging die.
  • the upper die blocking groove and the lower die blocking groove set up by the pre-forging die can suppress the material overflow at the initial stage, and can be perfectly formed with less material, which saves costs and facilitates the forming of the product; shortens the depth of the lower pre-forging die skirt Makes the pre-forged skirt can be filled more easily; the design of the flash groove makes the overflowing material reduce the force of the mold and increase the life of the mold.
  • the contact surfaces of the upper and lower molds of the pre-forging die and the final forging die form a parting surface, and the dimension depth from the lower die of the pre-forging die to the parting surface is 108 mm.
  • the best size is conducive to forming and streamlining.
  • the pre-forging die has an increased thickness of the combustion chamber of the pre-forging die.
  • the stock material is formed for the subsequent final forging process, which is convenient for product forming.
  • the corners of the pre-forging die and the final forging die are smooth and rounded. Increase the sharp R angle to increase the flow of the casting and make the product easier to shape.
  • combustion chambers and skirts of the pre-forging die and the final forging die are designed with draft angles.
  • the draft angle is conducive to demolding with the product, reducing friction with the mold during demolding, and improving the service life of the mold.
  • the diameter of the pine nut hole is Leave enough space for the casting machine push rod to facilitate product demolding.
  • the present invention has the beneficial effects: the installation of the pre-forging die and the final forging die is simple, and the cost and processing difficulty are relatively low; Use less material for perfect forming, saving cost and conducive to product forming; shortening the depth of the lower pre-forging die skirt makes it easier to fill the pre-forging skirt; the thickness of the combustion chamber of the pre-forging die is increased, which is the final forging process.
  • the forming stock material is convenient for product forming; the design of the flash groove makes the overflowing material reduce the stress of the mold and increase the life of the mold; the best parting surface with a dimension depth of 108mm is conducive to forming and streamlining; the draft angle is conducive to the product Demoulding, reducing the friction with the mold during demolding, and improving the service life of the mold.
  • Fig. 1 is a schematic diagram of the structure of the pre-forging die of the present invention.
  • Figure 2 is a schematic diagram of the structure of the final forging die of the present invention.
  • a steel piston forging die includes two relatively independent cylindrical dies including a pre-forging die and a final forging die.
  • the cylindrical mold is not only convenient for processing, but also convenient for installation and adjustment of the mold on the machine tool.
  • the pre-forging die is composed of a matching upper pre-forging die 1 and a lower pre-forging die 2
  • the final forging die is composed of a matching upper final forging die 3 and a lower final forging die 4;
  • the contact surface of the lower die forms a parting surface 12, and the depth of dimension from the bottom surface of the lower die of the pre-forging die to the parting surface 12 is 108 mm.
  • the dimension depth of 108mm is the best parting surface 12, which is conducive to product forming and streamline.
  • the corners of the pre-forging die and the final forging die are smooth and rounded; the sharp R angle is enlarged to increase the flow of the casting and make the product easier to shape.
  • the inner cavity of the pre-forging die and the final forging die of the present invention is composed of three parts: the skirt 8, the core 9 and the combustion chamber 10.
  • the pine nut hole 11 matched by the machine push rod; the best diameter of the pine nut hole 11 is Leave enough space for the casting machine push rod to facilitate product demoulding.
  • the combustion chamber 10 and the skirt 8 of the pre-forging die and the final forging die are designed with draft angles; the draft angle is good for demolding from the product, reducing friction with the mold during demolding, and improving the service life of the mold.
  • the upper pre-forging die 1 and the lower pre-forging die 2 are respectively provided with an upper die blocking groove 6 and a lower die blocking groove 7 which are matched and communicated with each other, and one of the upper and lower die of the pre-forging die and the final forging die Matching flash grooves 5 are also provided between them; in the pre-forging die, the flash grooves 5 are connected to the combustion chamber 10 through the upper mold blocking groove 6 and the lower mold blocking groove 7 that communicate with each other; In the forging die, the flash groove 5 is matched and communicated with the combustion chamber 10.
  • the upper mold blocking groove 6 and the lower mold blocking groove 7 set up by the pre-forging mold can suppress the material overflow at the initial stage, and can be perfectly formed with less material, which saves costs and facilitates the forming of the product; the design of the flash groove 5, The spilled material can reduce the stress on the mold and increase the life of the mold.
  • the size of the flash groove 5 of the final forging die of the present invention is larger than the size of the flash groove 5 of the pre-forging die; increasing the size of the flash groove 5 of the pre-forging die can reduce the final forging of the die When the force is applied to improve the life of the mold.
  • the depth of the skirt 8 of the lower pre-forging die 2 is smaller than the depth of the skirt 8 of the lower final forging die 4; shortening the depth of the skirt 8 of the lower pre-forging die 2 makes it easier to fill the skirt 8 during pre-forging.
  • the upper part of the core 9 of the pre-forging die is consistent with the upper part of the core 9 of the final forging die; after the pre-forging is completed, the forging can fit deeper with the die during the final forging, and is easy to form with the product.
  • the pre-forging die has an increased thickness of the combustion chamber 10 of the pre-forging die; the increase in the thickness of the combustion chamber 10 is a post-process final forging forming stock, which is convenient for product forming.
  • the terms “installed”, “connected”, and “connected” should be interpreted in a broad sense, for example, it may be a fixed connection or Removable connection or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • installed e.g., it may be a fixed connection or Removable connection or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

一种钢质活塞锻造模具，包括预锻模具和终锻模具两套相对独立的模具，预锻模具由预锻上模（1）和预锻下模（2）组成，终锻模具由终锻上模（3）和终锻下模（4）组成，预锻模具和终锻模具的内腔由裙部（8）、芯部（9）以及燃烧室（10）组成，预锻上模和预锻下模之间设有相配并相互连通的上模堵料槽（6）和下模堵料槽（7），预锻模具和终锻模具的上模具、下模具之间还设有飞边槽（5）；上模堵料槽、下模堵料槽可以抑制材料初期的外溢，得以用较少的材料来成形，飞边槽的设计，使得外溢的材料能减轻模具受力进而增加模具寿命。

Description

一种钢质活塞锻造模具 技术领域
本发明涉及模具锻造领域，具体的说是一种钢质活塞锻造模具。
背景技术
随着汽车发动机的快速发展，尤其是重型柴油发动机涡轮增压中冷技术的应用以及大缸径高压缩比、低排排放要求的不断提高，传统的铝合金活塞材料以无法满足其使用要求，人们便眼光投向钢质活塞，尤其是性能优良的S31726型钢质活塞。
S31726型钢质活塞成形难度大、模具寿命短，活塞复杂的结构易导致折叠，过深过薄的裙边又易导致缺料；如何锻造出成形性能好，锻件成形后无缺陷的S31726型钢质活塞模具成了行业一大技术难题
发明内容
本发明所要解决的技术问题是克服上述现有技术存在的缺陷，提供了一种成形性能好、使用寿命长的钢质活塞锻造模具。
为了实现上述目的，本发明采用如下技术方案：一种钢质活塞锻造模具，包括预锻模具和终锻模具在内的两套相对独立的圆柱状模具；预锻模具由相配的预锻上模和预锻下模组成，终锻模具由相配的终锻上模和终锻下模组成；所述预锻模具和终锻模具的内腔由裙部、芯部以及燃烧室三部分组成，裙部底部中央位置各设有与铸造机推杆匹配的松子孔；所述预锻上模和预锻下模之间分别设有相配并相互连通的上模堵料槽和下模堵料槽，预锻模具和终锻模具的上、下模具之间分别还设有匹配的飞边槽；所述预锻模具中，飞边槽以相互连通的上模堵料槽和下模堵料槽与燃烧室匹配连通；所述终锻模具中，飞边槽与燃烧 室匹配连通；所述终锻模具的飞边槽尺寸大于预锻模具的飞边槽尺寸，预锻下模的裙部深度小于终锻下模的裙部深度，预锻模具芯部上部分与终锻模具芯部上部分保持一致。预锻模具设立的上模堵料槽和下模堵料槽可以抑制材料初期的外溢，得以用较少的材料来完美成形，节约成本且利于产品的成形；缩短预锻下模裙部的深度使得预锻裙部可以更加容易充满；飞边槽的设计，使得外溢的材料能减轻模具受力进而增加模具寿命。
进一步的，所述预锻模具和终锻模具的上、下模具接触表面形成分模面，预锻模具的下模具到分模面的尺寸深度为108mm。最佳的尺寸有利于成形及流线。
进一步的，所述预锻模具相比终锻模具，预锻模具的燃烧室厚度增加。为后面终锻工序成形囤料，便于产品成形。
进一步的，所述预锻模具和终锻模具拐角处光顺圆润处理。将锐利的R角增大以增加铸件的流动，使产品更易成形。
进一步的，所述预锻模具和终锻模具的燃烧室和裙部设计有拔模角。拔模角度利于与产品脱模，减少脱模时与模具的摩擦，提高模具的使用寿命。
进一步的，所述松子孔的直径为
Figure PCTCN2020095880-appb-000001
为铸造机推杆留有足够的进出空间，利于产品脱模。
本发明具有的有益效果是：预锻模具和终锻模具安装简单，成本和加工难度相对较低；预锻模具设立的上模堵料槽和下模堵料槽可以抑制材料初期的外溢，得以用较少的材料来完美成形，节约成本且利于产品的成形；缩短预锻下模裙部的深度使得预锻裙部可以更加容易充满；预锻模具的燃烧室厚度增加，为后面终锻工序成形囤料，便于产品成形；飞边槽的设计，使得外溢的材料能减轻模具受力进而增加模具寿命；尺寸深度为108mm的最佳分模面利于成形及 流线；拔模角度利于与产品脱模，减少脱模时与模具的摩擦，提高模具的使用寿命。
附图说明
图1是本发明的预锻模具的结构示意图。
图2是本发明的终锻模具的结构示意图。
附图标号说明：1、预锻上模，2、预锻下模，3、终锻上模，4、终锻下模，5、飞边槽,6、上模堵料槽,7、下模堵料槽，8、裙部,9、芯部，10、燃烧室，11、松子孔，12、分模面。
具体实施方式
以下结合附图和实施方式对本发明作进一步的说明。
如图1和图2所示，一种钢质活塞锻造模具，包括预锻模具和终锻模具在内的两套相对独立的圆柱状模具。设计成圆柱状的模具不但方便加工，也方便模具在机床上的安装和调整。预锻模具由相配的预锻上模1和预锻下模2组成，终锻模具由相配的终锻上模3和终锻下模4组成；所述预锻模具和终锻模具的上、下模具接触表面形成分模面12，预锻模具的下模具底面到分模面12的尺寸深度为108mm。尺寸深度108mm为最佳分模面12，这样利于产品成形及流线。所述预锻模具和终锻模具拐角处光顺圆润处理；将锐利的R角增大以增加铸件的流动，使产品更易成形。
如图1和图2所示，本发明所述预锻模具和终锻模具的内腔由裙部8、芯部9以及燃烧室10三部分组成，裙部8底部中央位置各设有与铸造机推杆匹配的松子孔11；松子孔11的最佳直径为
Figure PCTCN2020095880-appb-000002
给铸造机推杆留有足够的进出空间，利于产品脱模。所述预锻模具和终锻模具的燃烧室10和裙部8设计有拔模角；拔模角度利于与产品脱模，减少脱模时与模具的摩擦，提高模具的使用寿命。 所述预锻上模1和预锻下模2之间分别设有相配并相互连通的上模堵料槽6和下模堵料槽7，预锻模具和终锻模具的上、下模具之间分别还设有匹配的飞边槽5；所述预锻模具中，飞边槽5以相互连通的上模堵料槽6和下模堵料槽7与燃烧室10匹配连通；所述终锻模具中，飞边槽5与燃烧室10匹配连通。预锻模具设立的上模堵料槽6和下模堵料槽7可以抑制材料初期的外溢，得以用较少的材料来完美成形，节约成本且利于产品的成形；飞边槽5的设计，使得外溢的材料能减轻模具受力进而增加模具寿命。
如图1和图2所示，本发明所述终锻模具的飞边槽5尺寸大于预锻模具的飞边槽5尺寸；加大预锻模具的飞边槽5尺寸，能减轻模具终锻时的受力从而提高模具寿命。预锻下模2的裙部8深度小于终锻下模4的裙部8深度；缩短预锻下模2裙部8的深度使得预锻时裙部8可以更加容易充满。预锻模具芯部9上部分与终锻模具芯部9上部分保持一致；在预锻结束后，锻件可以在终锻时与模具契合更深，易与产品的成形。预锻模具相比终锻模具，预锻模具的燃烧室10厚度增加；在燃烧室10部分增加厚度为后工序终锻成形囤料，便于产品成形。
在本发明的描述中，需要说明的是，如出现术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等，其所指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，如出现术语“第一”、“第二”、“第三”仅用于描述目的，而不能理解为指示或暗示相对重要性。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，如出现术语“安装”、“相连”、“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，也可以通过中间媒介间接相连，可以是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发明中的具体含义。
在不改变本发明的创造内容下进行简单的置换均视为相同的创造。说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (6)

  1. 一种钢质活塞锻造模具，其特征在于：包括预锻模具和终锻模具在内的两套相对独立的圆柱状模具；预锻模具由相配的预锻上模(1)和预锻下模(2)组成，终锻模具由相配的终锻上模(3)和终锻下模(4)组成；所述预锻模具和终锻模具的内腔由裙部(8)、芯部(9)以及燃烧室(10)三部分组成，裙部(8)底部中央位置各设有与铸造机推杆匹配的松子孔(11)；所述预锻上模(1)和预锻下模(2)之间分别设有相配并相互连通的上模堵料槽(6)和下模堵料槽(7)，预锻模具和终锻模具的上、下模具之间分别还设有匹配的飞边槽(5)；所述预锻模具中，飞边槽(5)以相互连通的上模堵料槽(6)和下模堵料槽(7)与燃烧室(10)匹配连通；所述终锻模具中，飞边槽(5)与燃烧室(10)匹配连通；所述终锻模具的飞边槽(5)尺寸大于预锻模具的飞边槽(5)尺寸，预锻下模(2)的裙部(8)深度小于终锻下模(4)的裙部(8)深度，预锻模具芯部(9)上部分与终锻模具芯部(9)上部分保持一致。
  2. 根据权利要求1所述的一种钢质活塞锻造模具，其特征在于：所述预锻模具和终锻模具的上、下模具接触表面形成分模面(12)，预锻模具的下模具底面到分模面(12)的尺寸深度为108mm。
  3. 根据权利要求1、2所述的一种钢质活塞锻造模具，其特征在于：所述预锻模具相比终锻模具，预锻模具的燃烧室(10)厚度增加。
  4. 根据权利要求3所述的一种钢质活塞锻造模具，其特征在于：所述预锻模具和终锻模具拐角处光顺圆润处理。
  5. 根据权利要求1、3所述的一种钢质活塞锻造模具，其特征在于：所述预锻模具和终锻模具的燃烧室(10)和裙部(8)设计有拔模角。
  6. 根据权利要求1所述的一种钢质活塞锻造模具，其特征在于：所述松子 孔(11)的直径为
    Figure PCTCN2020095880-appb-100001
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