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Bimetallic sintering process of spheroidal graphite cast iron and copper

A ductile iron and bimetal technology, which is applied in the field of bimetal sintering of ductile iron and copper, can solve the problems of poor bonding strength and surface inclusions on the bonding surface, and achieve the effect of good distribution.

Active Publication Date: 2013-06-05
SHANDONG CCHC HYDRAULICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a bimetallic sintering process of nodular cast iron and copper, which solves the problems of poor bonding strength and air holes on the surface of the bonding surface in the bimetallic sintering technology of ductile iron matrix copper rods

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  • Bimetallic sintering process of spheroidal graphite cast iron and copper

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: a kind of bimetallic sintering process of ductile iron and copper, its step comprises:

[0021] a. Raw material selection:

[0022] Substrate: Nodular cast iron QT700 is used. According to the design process requirements, without affecting the subsequent processing, the structure of the substrate parts is improved to ensure effective control of the generation of sintered pores.

[0023] Copper rod: lead bronze is selected, the mass percentage of which is Pb120g, Sn60g, Ni10g, Fe5g, and the remaining content is Cu730g. After descaling, it is turned to meet the process requirements.

[0024] b. Ultrasonic cleaning:

[0025] Before sintering, use water-based cleaning liquid to thoroughly clean the washing cylinder and copper rods of ductile iron, and reliably and economically clean and remove debris, oil, and emulsion on the workpiece to ensure the sintering quality.

[0026] c. Vacuum cleaning:

[0027] Under the condition of vacuum and negative pressure,...

Embodiment 2

[0035] Embodiment 2: a kind of bimetallic sintering process of ductile iron and copper, its step comprises:

[0036] a. Raw material selection:

[0037] Substrate: Nodular cast iron QT700 is used. According to the design process requirements, without affecting the subsequent processing, the structure of the substrate parts is improved to ensure effective control of the generation of sintered pores.

[0038] Copper rod: lead bronze is selected, and the mass percentage is Pb150g, Sn80g, Ni30g, Fe10g, and the remaining content is Cu815g. After descaling, it is turned to meet the process requirements.

[0039] b. Ultrasonic cleaning:

[0040] Before sintering, use water-based cleaning liquid to thoroughly clean the washing cylinder and copper rods of ductile iron, and reliably and economically clean and remove debris, oil, and emulsion on the workpiece to ensure the sintering quality.

[0041] c. Vacuum cleaning:

[0042] Under the condition of vacuum and negative pressure, use...

Embodiment 3

[0050] Embodiment 3: a kind of bimetallic sintering process of ductile iron and copper, its step comprises:

[0051] a. Raw material selection:

[0052] Substrate: Nodular cast iron QT700 is used. According to the design process requirements, without affecting the subsequent processing, the structure of the substrate parts is improved to ensure effective control of the generation of sintered pores.

[0053] Copper rod: lead bronze is selected, of which the mass percentage is Pb130g, Sn70g, Ni20g, Fe7g, and the remaining content is Cu780g. After descaling, it is turned to meet the process requirements.

[0054] b. Ultrasonic cleaning:

[0055] Before sintering, use water-based cleaning liquid to thoroughly clean the washing cylinder and copper rods of ductile iron, and reliably and economically clean and remove debris, oil, and emulsion on the workpiece to ensure the sintering quality.

[0056] c. Vacuum cleaning:

[0057] Under the condition of vacuum and negative pressure,...

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Abstract

The invention relates to a bimetallic sintering process of spheroidal graphite cast iron and copper. The bimetallic sintering process comprises the following steps of: selection of raw materials: QT700 is adopted for a spheroidal graphite cast iron base body and lead bronze is selected for a copper rod; ultrasonic cleaning: before sintering, a water-based cleaning liquid is adopted for cleaning the spheroidal graphite cast iron and the lead-bronze copper rod thoroughly; vacuum cleaning: under the condition of vacuum negative pressure, a carbon-hydrogen cleaning agent is utilized for further circulatory cleaning of the spheroidal graphite cast iron and the lead-bronze copper rod; coating of a fluxing agent: a layer of fluxing agent with the thickness of 0.5mm-1.5mm is coated on the surfaceof the spheroidal graphite cast iron; treatment of the copper rod: a coating for preventing the copper rod from generating air holes on the surface of the spheroidal graphite cast iron in the processof heating and melting is sprayed on the surface of the copper rod, and then the treated copper rod is placed on the spheroidal graphite cast iron; and sintering. The bimetallic sintering process canbe used for solving the problems such as poor combining strength and mixing of the air holes on the combined surface in the bimetallic sintering technology of the spheroidal graphite cast iron and the copper rod.

Description

technical field [0001] The invention relates to a bimetal sintering process, in particular to a bimetal sintering process of nodular cast iron and copper. Background technique [0002] At present, the sintering process is widely used in the manufacture of bimetallic cylinders. At present, the bimetallic sintering technology of copper rods with steel substrates is relatively mature in China, but there is still a lack of bimetallic sintering technology for ductile iron substrates and copper rods. Due to The existence of a large amount of free carbon in ductile iron affects the bonding strength of ductile iron matrix and copper alloy, and a stable and effective sintering process has not yet been formed. At present, the domestic pass rate is between 60-70%. Therefore, the ductile iron matrix of the existing hydraulic pump cylinder The sintering process with copper alloy needs to be perfected urgently. [0003] In view of this, in view of the above problems, a dual metal sinteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K28/00B32B37/04B32B15/01
Inventor 英宵张桂忠沈怀海韩保卫张希平杨军华
Owner SHANDONG CCHC HYDRAULICS