WO2017035919A1 - 一种高耐磨、可修复式锥型双机筒的制备方法 - Google Patents

一种高耐磨、可修复式锥型双机筒的制备方法 Download PDF

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Publication number
WO2017035919A1
WO2017035919A1 PCT/CN2015/091832 CN2015091832W WO2017035919A1 WO 2017035919 A1 WO2017035919 A1 WO 2017035919A1 CN 2015091832 W CN2015091832 W CN 2015091832W WO 2017035919 A1 WO2017035919 A1 WO 2017035919A1
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Prior art keywords
barrel
wear
resistant
machine barrel
repairable
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PCT/CN2015/091832
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English (en)
French (fr)
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钱兵
孙书刚
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南通高欣耐磨科技股份有限公司
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Publication of WO2017035919A1 publication Critical patent/WO2017035919A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B29C48/682—Barrels or cylinders for twin screws

Definitions

  • the invention relates to the technical field of an extruder assembly, in particular to a preparation method of a high wear-resistant and repairable conical double barrel.
  • the extruder As a common extruder equipment, the extruder is used in the plastics processing industry. It is mainly used to extrude thermoplastics such as soft and hard polyvinyl chloride and polyethylene. It can process a variety of plastic products, such as blown film and extruded tubes. , press plate, pull ribbon, etc., can also be used for melt granulation.
  • the existing extruder generally adopts a conical twin-screw extruder, and the design structure is relatively simple. The discharge section is subjected to large force and easy to wear, and the feeding section is less likely to wear, resulting in different wear amounts before and after, but the discharge section is worn. After the whole barrel can not be used very well, the life is short, and the product quality can not be guaranteed.
  • the Chinese utility model patent (CN201420250245) discloses an improved conical double barrel semi-segmented alloy sleeve, which has the same feeding section and an alloy sleeve in the discharge section, which doubles the service life and is durable. However, the alloy sleeve itself is easily deformed when sintered, the finished product is low, and the combination with the barrel is mechanically combined.
  • the Chinese utility model patent (CN02254687) discloses a conical twin-screw plastic extruder barrel with good abrasion resistance, and a cemented carbide blade is embedded in the inner wall of the cylinder body. The utility model has a cemented carbide insert embedded in the inner hole of the cylinder.
  • the hardness of the cemented carbide is far greater than the surface hardness after oxidation, and the thickness of the blade exceeds the thickness of the spray of the bimetal, under a certain pressure, The wear of the cylinder becomes very small, so that the service life of the cone double cylinder is greatly improved.
  • the alloy blade is discretely embedded in the inner wall of the cylinder, and the inner hole wall not covered with the alloy blade is prone to wear, so that the inner wall of the barrel is unevenly worn, and when the alloy blade is worn, it is required
  • the replacement of the alloy blades one by one is a waste of time and an increase in cost, and therefore, the structure of the barrel needs to be further improved.
  • the Chinese utility model patent discloses a conical twin-screw extruder barrel, which is composed of an outer cylinder and a replaceable bushing therein.
  • the bushing has a certain wall thickness and the inner hole is two.
  • the bushing may be abutted or overlapped by corresponding segments according to the segmentation of the outer cylinder; the bushing may also be divided into two half rings or one half ring plus two quarter rings from the cross section. Four quarter rings. Since the sleeve bushing of the conical twin-screw extruder of the present invention can be easily replaced after being worn, labor saving and time saving are achieved. However, the bushing of the barrel is not sufficiently wear resistant, resulting in frequent bushing replacement and increased cost.
  • the existing extruder discharge section barrel also adopts the process of centrifugal casting wear-resistant alloy material, but due to the tapered structure, the alloy distribution is not uniform under the centrifugal state, the bonding strength is not enough, and it is easy to fall off during use.
  • the object of the present invention is to solve the deficiencies in the prior art, to provide a wear-resistant layer that does not fall off during use, and to improve the production efficiency of the extruder, save replacement cost, and improve economic efficiency.
  • the preparation method of a high wear-resisting and repairable cone type double barrel according to the present invention is prepared by the following methods:
  • the round steel forging is subjected to boring processing, and the inner double hole is a conical double barrel blank having intersecting two circles and a cross-sectional shape of a figure-eight ring;
  • the ordinary steel is processed into a mandrel with the same taper of the inner hole of the barrel.
  • the size of the core rod is 1-3 mm longer than the inner diameter of the inner hole of the barrel, and the surface of the two core rods is spray-welded with a low melting point alloy. After grinding the surface, the outer diameter of the 1-3mm from the head is the same as the inner hole of the end face of the barrel, and then the excess material of the two core rods is cut according to the inner diameter of the tapered double barrel.
  • the conical double barrel core rod is inserted into the hole of the barrel blank and compacted to form a barrel assembly;
  • the barrel assembly is placed in a vacuum furnace and heated to 1050-1200 °C for 2-3 hours.
  • the alloy wear layer of the core rod surface is metallurgically bonded to the inner wall of the barrel. After the furnace is cooled, the barrel assembly is taken out;
  • the above-mentioned barrel is subjected to boring processing to remove the mandrel material embedded in the barrel hole, and the low-melting alloy wear layer remains on the inner wall of the barrel to form a high wear-resistant cone double barrel;
  • round steel forging material is 45 steel, 40Cr or 42CrMo.
  • the ordinary steel is medium carbon steel or low carbon steel.
  • the low melting point is combined into an iron-based self-fluxing alloy, a nickel-based self-fluxing alloy, or a cobalt-based self-fluxing alloy.
  • the layer of the low melting point alloy wear layer has a thickness of 2-4 mm.
  • the hardness of the low melting point alloy wear layer is 60-65 HRC.
  • a high wear-resisting and repairable cone type double barrel according to the present invention and a preparation method thereof have the following obvious effects:
  • Figure 1 is a front elevational view showing the structure of the barrel blank of the present invention
  • Figure 2 is a side view of Figure 1;
  • Figure 3 is a front elevational view showing the structure of a core rod blank of the present invention.
  • Figure 4 is a side view of Figure 3;
  • Figure 5 is a front elevational view showing the structure of a tapered double barrel core rod of the present invention.
  • Figure 6 is a side view of Figure 5;
  • Figure 7 is a front elevational view showing the structure of the barrel assembly of the present invention.
  • Figure 8 is a side view of Figure 7;
  • Figure 9 is a front elevational view showing the structure of the tapered double barrel of the present invention.
  • Figure 10 is a side view of Figure 9.
  • the invention discloses a preparation method of a high wear-resisting and repairable cone type double barrel, which is prepared by the following methods:
  • the 45 steel forgings are subjected to boring processing, and processed into a conical double barrel blank 1 having inner diameters of two circles intersecting each other and having a figure-eight-shaped cross section, as shown in Figs. 1 and 2;
  • the barrel assembly is placed in a vacuum furnace and heated to 1050 ° C for 2 hours.
  • the iron-based alloy wear layer on the surface of the mandrel is metallurgically bonded to the inner wall of the barrel. After the furnace is cooled, the barrel assembly is taken out;
  • the ordinary steel is medium carbon steel or low carbon steel.
  • the iron-based self-fluxing alloy wear layer has a thickness of 2-4 mm.
  • the hardness of the wear-resistant layer of the iron-based self-fluxing alloy is 60-65 HRC.
  • the invention discloses a preparation method of a high wear-resisting and repairable cone type double barrel, which is prepared by the following methods:
  • the 40Cr forging is subjected to boring processing, and the inner circular hole is a conical double barrel blank with two circles intersecting and a cross-section having a figure-eight ring;
  • the ordinary steel is processed into a mandrel with the same taper as the inner hole of the barrel.
  • the size of the mandrel is 2 mm longer than the inner diameter of the inner hole of the barrel, and the surface of the two core rods is spray-welded with a layer of nickel-based self-fluxing alloy. After the surface of the wear-resistant layer is ground, the outer diameter of the inner diameter of the barrel is the same as the inner diameter of the end face of the barrel, and then the excess material of the two core rods is cut according to the inner diameter of the tapered double barrel.
  • the double barrel core rod is inserted into the hole of the barrel blank and compacted to form a barrel assembly;
  • the barrel assembly is placed in a vacuum furnace and heated to 1100 ° C for 2.5 hours.
  • the nickel-base alloy wear layer on the surface of the mandrel is metallurgically bonded to the inner wall of the barrel. After the furnace is cooled, the barrel assembly is taken out;
  • the above-mentioned barrel is subjected to boring processing to remove the mandrel material embedded in the barrel hole, and the wear-resistant layer of the nickel-base alloy is left on the inner wall of the barrel to form a high wear-resistant cone double barrel;
  • the ordinary steel is medium carbon steel or low carbon steel.
  • the nickel-based self-fluxing alloy wear layer has a thickness of 2-4 mm.
  • the hardness of the wear-resistant layer of the nickel-based self-fluxing alloy is 60-65 HRC.
  • the invention discloses a preparation method of a high wear-resisting and repairable cone type double barrel, which is prepared by the following methods:
  • the 42CrMo forging is subjected to boring processing, and the inner double hole is a conical double barrel blank having intersecting two circles and a cross-sectional shape of a figure-eight ring;
  • the ordinary steel is processed into a mandrel with the same taper as the inner hole of the barrel.
  • the size of the mandrel is 3 mm longer than the inner diameter of the inner hole of the barrel, and the surface of the two core rods is spray-welded with a cobalt-based self-fluxing alloy.
  • the outer diameter of the inner diameter of the barrel is 3mm from the size of the inner end of the barrel, and then the excess material of the two core rods is cut according to the inner diameter of the cone.
  • the double barrel core rod is inserted into the hole of the barrel blank and compacted to form a barrel assembly;
  • the barrel assembly is placed in a vacuum furnace and heated to 1200 ° C for 3 hours.
  • the cobalt-based alloy wear layer on the surface of the mandrel is metallurgically bonded to the inner wall of the barrel. After the furnace is cooled, the barrel assembly is taken out;
  • the ordinary steel is medium carbon steel or low carbon steel.
  • the cobalt-based self-fluxing alloy wear layer has a thickness of 2-4 mm.
  • the hardness of the wear-resistant layer of the cobalt-based self-fluxing alloy is 60-65 HRC.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Forging (AREA)

Abstract

一种高耐磨、可修复式锥型双机筒的制备方法，将圆钢锻件进行镗加工，加工成内孔为两个圆相交、横截面呈八字形环的锥形双机筒毛坯（1）；采用普通钢材加工成与机筒内孔锥度相同的芯棒（2），将两个芯棒表面喷焊一层低熔点合金耐磨层（3），将芯棒套入机筒毛坯孔内并压紧形成机筒装配体；将机筒装配体放入真空炉内进行升温处理；将机筒装配体大小头多余的芯棒材料车加工去除，对机筒进行镗加工，去除机筒孔内镶嵌的芯棒材料。该制备方法实现了在真空烧结状态下合金耐磨层与锥形孔内壁的冶金结合，比镶嵌硬质合金材料结合强度更高，使用过程中耐磨层不会脱落，同时提高了挤出机生产效率，节约了更换成本，提高了经济效益。

Description

一种高耐磨、可修复式锥型双机筒的制备方法 技术领域
本发明涉及挤出机组件技术领域，尤其涉及一种高耐磨、可修复式锥形双机筒的制备方法。
背景技术
挤出机作为一种常见的挤出机设备，用于塑料加工行业，主要用于挤出软、硬聚氯乙烯、聚乙烯等热塑性塑料，可加工多种塑料制品，如吹膜、挤管、压板、拔丝带等，亦可用于熔融造粒。现有的挤出机一般采用锥形双螺杆挤出机，设计结构较为简单，出料段受力大、易磨损，进料段不太会磨损造成前后不同的磨损量，但出料段磨损后整个机筒不能很好使用，寿命短，且产品质量无法保障。
中国实用新型专利(CN201420250245)公开了一种改进型锥形双机筒半段镶合金套,该结构为进料段不变，出料段镶合金套，使用寿命提高一倍,经久耐用。但合金套本身烧结时容易变形，成品低，且与机筒结合方式为机械结合。中国实用新型专利(CN02254687)公开了一种抗磨损性好的锥形双螺杆型塑料挤出机机筒，筒体的内孔壁上镶嵌有硬质合金刀片。本实用新型的筒体内孔里面镶嵌硬质合金刀片，由于硬质合金的硬度远远大于氧化后的表面硬度，加上其刀片的厚度超过双金属的喷涂厚度，所以在特定的压力下，其筒体的磨损变得很微小，使得锥双筒体的使用寿命得到大幅提高。但是，该合金刀片分散地镶嵌在筒体的内孔壁上，未覆盖有合金刀片的内孔壁容易出现磨损的现象，从而使得机筒内壁磨损不均，而且当合金刀片出现磨损后，需将合金刀片逐个更换，既浪费时间，又增加成本，因此，该机筒的结构有待于进一步改进。中国实用新型专利(CN200420044207)公开了一种锥形双螺杆挤出机机筒筒体，由外筒和其内的可更换衬套构成，衬套为具有一定的壁厚，内孔为两个相交圆孔、横截面呈八字形环的锥形柱状体。衬套可根据外筒的分段而由对应的分段对接或搭接而成；衬套也可是从横截面上也可分为两个半环或一个半环加两个四分之一环、四个四分之一环组成。由于本新型的锥形双螺杆挤出机机筒筒体衬套磨损后可方便地更换衬套，从而省工省时降低成本。但是，该机筒的衬套耐磨损性不够好，导致衬套更换频繁，增加成本。
此外，现有挤出机出料段机筒也有采用离心浇注耐磨合金材料工艺，但因锥形结构导致离心状态下合金分布不均匀，结合强度不够，使用过程中易脱落。
发明内容
发明目的：本发明的目的是为了解决现有技术中的不足，提供一种使用过程中耐磨层不会脱落；且提高了挤出机生产效率，节约了更换成本，提高了经济效益的高耐磨、可修复式锥型双机筒的制备方法。
技术方案：本发明所述的一种高耐磨、可修复式锥型双机筒的制备方法，由下列方法制成：
(1)将圆钢锻件进行镗加工，加工成内孔为两个圆相交、横截面呈八字形环的锥形双机筒毛坯；
(2)采用普通钢材加工成与机筒内孔锥度相同的芯棒，芯棒大小头较机筒内孔轴向各长1-3mm，将两个芯棒表面喷焊一层低熔点合金耐磨层，表面进行磨加工处理后，距大小头1-3mm处外径尺寸与机筒端面内孔尺寸相同，然后再按照锥形双机筒内孔尺寸切掉两个芯棒多余材料，将锥形双机筒芯棒套入机筒毛坯孔内并压紧形成机筒装配体；
(3)机筒装配体放入真空炉内升温至1050-1200℃保温2-3小时，芯棒表面合金耐磨层与机筒内壁实现冶金结合，随炉冷却后，取出机筒装配体；
(4)将上述装配体大小头多余的1-3mm芯棒材料车加工去除，保证芯棒与机筒端面齐平；
(5)将上述机筒进行镗加工，去除机筒孔内镶嵌的芯棒材料，低熔点合金耐磨层留在机筒内壁，制成高耐磨锥形双机筒；
(6)上述高耐磨锥形双机筒使用磨损后，可对内孔再次进行镗加工处理，按照上述步骤(1)-(5)工艺流程进行修复，制成一种高耐磨、可修复式锥形双机筒。
进一步的，所述圆钢锻件材质为45钢、40Cr或42CrMo。
进一步的，所述普通钢材为中碳钢或低碳钢。
进一步的，所述低熔点合为铁基自熔性合金、镍基自熔性合金或钴基自熔性合金。
进一步的，所述一层低熔点合金耐磨层的厚度为2-4mm。
进一步的，所述低熔点合金耐磨层的硬度为60-65HRC。
有益效果：本发明所述的一种高耐磨、可修复式锥型双机筒及其制备方法具有如下明显效果：
(1)出料段锥形双机筒使用寿命提高了2倍以上，提高了挤出机生产效率，节约了更换成本，提高了经济效益；
(2)解决了锥形双机筒难以离心复合铸造的难题，真空烧结状态下，合金耐磨层与锥形孔内壁实现了冶金结合，较镶嵌硬质合金材料结合强度更高，使用过程中耐磨层不会脱落；
(3)该产品实现了可修复，修复工艺简单，节约了大量的成本。
附图说明
图1为本发明的机筒毛坯结构主视图；
图2为图1的侧视图；
图3为本发明芯棒毛坯结构主视图；
图4为图3的侧视图；
图5为本发明锥形双机筒芯棒结构主视图；
图6为图5的侧视图；
图7为本发明的机筒装配体结构主视图；
图8为图7的侧视图；
图9为本发明的锥形双机筒成品结构主视图；
图10为图9的侧视图。
具体实施方式
下面结合附图和具体实施例对本发明做进一步详细说明：
实施例1
一种高耐磨、可修复式锥型双机筒的制备方法，由下列方法制成：
(1)将45钢锻件进行镗加工，加工成内孔为两个圆相交、横截面呈八字形环的锥形双机筒毛坯1，如图1和图2所示；
(2)采用普通钢材加工成与机筒内孔锥度相同的芯棒2，如图3和图4所示，芯棒大小头较机筒内孔轴向各长1mm，将两个芯棒2表面喷焊一层铁基自熔性合金耐磨层3，表面进行磨加工处理后，距大小头1mm处外径尺寸与机筒端面内孔尺寸相同，然后再按照锥形双机筒内孔尺寸切掉两个芯棒多余材料，如图5和图6所示，将锥形双机筒芯棒2套入机筒毛坯1孔内并压紧形成机筒装配体，如图7和图8所示；
(3)机筒装配体放入真空炉内升温至1050℃保温2小时，芯棒表面铁基合金耐磨层与机筒内壁实现冶金结合，随炉冷却后，取出机筒装配体；
(4)将上述装配体大小头多余的1mm芯棒材料车加工去除，保证芯棒与机筒端面齐平；
(5)将上述机筒进行镗加工，去除机筒孔内镶嵌的芯棒材料，铁基合金耐磨层留在机筒内壁，制成高耐磨锥形双机筒，如图9和图10所示；
(6)上述高耐磨锥形双机筒使用磨损后，可对内孔再次进行镗加工处理，按照上述整个工艺流程进行修复，制成一种高耐磨、可修复式锥形双机筒。
进一步的，所述的普通钢材为中碳钢或低碳钢。
进一步的，所述的铁基自熔性合金耐磨层厚度为2-4mm。
进一步的，所述的铁基自熔性合金耐磨层硬度为60-65HRC。
实施例2
一种高耐磨、可修复式锥型双机筒的制备方法，由下列方法制成：
(1)将40Cr锻件进行镗加工，加工成内孔为两个圆相交、横截面呈八字形环的锥形双机筒毛坯；
(2)采用普通钢材加工成与机筒内孔锥度相同的芯棒，芯棒大小头较机筒内孔轴向各长2mm，将两个芯棒表面喷焊一层镍基自熔性合金耐磨层，表面进行磨加工处理后，距大小头2mm处外径尺寸与机筒端面内孔尺寸相同，然后再按照锥形双机筒内孔尺寸切掉两个芯棒多余材料，将锥形双机筒芯棒套入机筒毛坯孔内并压紧形成机筒装配体；
(3)机筒装配体放入真空炉内升温至1100℃保温2.5小时，芯棒表面镍基合金耐磨层与机筒内壁实现冶金结合，随炉冷却后，取出机筒装配体；
(4)将上述装配体大小头多余的2mm芯棒材料车加工去除，保证芯棒与机筒端面齐平；
(5)将上述机筒进行镗加工，去除机筒孔内镶嵌的芯棒材料，镍基合金耐磨层留在机筒内壁，制成高耐磨锥形双机筒；
(6)上述高耐磨锥形双机筒使用磨损后，可对内孔再次进行镗加工处理，按照上述整个工艺流程进行修复，制成一种高耐磨、可修复式锥形双机筒。
进一步的，所述的普通钢材为中碳钢或低碳钢。
进一步的，所述的镍基自熔性合金耐磨层厚度为2-4mm。
进一步的，所述的镍基自熔性合金耐磨层硬度为60-65HRC。
实施例3
一种高耐磨、可修复式锥型双机筒的制备方法，由下列方法制成：
(1)将42CrMo锻件进行镗加工，加工成内孔为两个圆相交、横截面呈八字形环的锥形双机筒毛坯；
(2)采用普通钢材加工成与机筒内孔锥度相同的芯棒，芯棒大小头较机筒内孔轴向各长3mm，将两个芯棒表面喷焊一层钴基自熔性合金耐磨层，表面进行磨加工处理后，距大小头3mm处外径尺寸与机筒端面内孔尺寸相同，然后再按照锥形双机筒内孔尺寸切掉两个芯棒多余材料，将锥形双机筒芯棒套入机筒毛坯孔内并压紧形成机筒装配体；
(3)机筒装配体放入真空炉内升温至1200℃保温3小时，芯棒表面钴基合金耐磨层与机筒内壁实现冶金结合，随炉冷却后，取出机筒装配体；
(4)将上述装配体大小头多余的3mm芯棒材料车加工去除，保证芯棒与机筒端面齐平；
(5)将上述机筒进行镗加工，去除机筒孔内镶嵌的芯棒材料，钴基合金耐磨层留在机筒 内壁，制成高耐磨锥形双机筒；
(6)上述高耐磨锥形双机筒使用磨损后，可对内孔再次进行镗加工处理，按照上述整个工艺流程进行修复，制成一种高耐磨、可修复式锥形双机筒。
进一步的，所述的普通钢材为中碳钢或低碳钢。
进一步的，所述的钴基自熔性合金耐磨层厚度为2-4mm。
进一步的，所述的钴基自熔性合金耐磨层硬度为60-65HRC。
本发明所述的一种高耐磨、可修复式锥型双机筒及其制备方法具有如下明显效果：
(1)出料段锥形双机筒使用寿命提高了2倍以上，提高了挤出机生产效率，节约了更换成本，提高了经济效益；
(2)解决了锥形双机筒难以离心复合铸造的难题，真空烧结状态下，合金耐磨层与锥形孔内壁实现了冶金结合，较镶嵌硬质合金材料结合强度更高，使用过程中耐磨层不会脱落；
(3)该产品实现了可修复，修复工艺简单，节约了大量的成本。
以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明，任何熟悉本专业的技术人员，在不脱离本发明技术方案范围内，当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明技术方案的范围内。

Claims (6)

  1. 一种高耐磨、可修复式锥型双机筒的制备方法，其特征在于：由下列方法制成：
    (1)将圆钢锻件进行镗加工，加工成内孔为两个圆相交、横截面呈八字形环的锥形双机筒毛坯；
    (2)采用普通钢材加工成与机筒内孔锥度相同的芯棒，芯棒大小头较机筒内孔轴向各长1-3mm，将两个芯棒表面喷焊一层低熔点合金耐磨层，表面进行磨加工处理后，距大小头1-3mm处外径尺寸与机筒端面内孔尺寸相同，然后再按照锥形双机筒内孔尺寸切掉两个芯棒多余材料，将锥形双机筒芯棒套入机筒毛坯孔内并压紧形成机筒装配体；
    (3)机筒装配体放入真空炉内升温至1050-1200℃保温2-3小时，芯棒表面合金耐磨层与机筒内壁实现冶金结合，随炉冷却后，取出机筒装配体；
    (4)将上述装配体大小头多余的1-3mm芯棒材料车加工去除，保证芯棒与机筒端面齐平；
    (5)将上述机筒进行镗加工，去除机筒孔内镶嵌的芯棒材料，低熔点合金耐磨层留在机筒内壁，制成高耐磨锥形双机筒；
    (6)上述高耐磨锥形双机筒使用磨损后，可对内孔再次进行镗加工处理，按照上述步骤(1)-(5)工艺流程进行修复，制成一种高耐磨、可修复式锥形双机筒。
  2. 根据权利要求1所述的一种高耐磨、可修复式锥型双机筒的制备方法，其特征在于：所述圆钢锻件材质为45钢、40Cr或42CrMo。
  3. 根据权利要求1所述的一种高耐磨、可修复式锥型双机筒的制备方法，其特征在于：所述普通钢材为中碳钢或低碳钢。
  4. 根据权利要求1所述的一种高耐磨、可修复式锥型双机筒的制备方法，其特征在于：所述低熔点合为铁基自熔性合金、镍基自熔性合金或钴基自熔性合金。
  5. 根据权利要求1所述的一种高耐磨、可修复式锥型双机筒的制备方法，其特征在于：所述一层低熔点合金耐磨层的厚度为2-4mm。
  6. 根据权利要求1或5所述的一种高耐磨、可修复式锥型双机筒的制备方法，其特征在于：所述低熔点合金耐磨层的硬度为60-65HRC。
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