Surface treatment process for spherulitic graphite cast pipe

A technology for surface treatment and pipe casting, applied in the field of ductile cast pipe casting production, can solve problems such as energy waste, poor treatment effect, and difficult operation, and achieve the effect of solving energy waste and improving hole filling effect.

Pending Publication Date: 2022-02-25
SHANDONG GUOMING DUCTILE IRON PIPES TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the three problems mentioned above in the background technology, the present invention provides a surface treatment process for ductile cast pipes, which decomposes the existing hole-filling and sintering process as a surface post-treatment means and integrates it into the normal heat treatment of ductile cast pipes In the process, the three major problems of energy waste, difficult operation and poor treatment effect are completely solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A surface treatment process for a ductile cast pipe, comprising a surface filling step and a sintering step of a filling material, the surface filling step is performed before the heat treatment process of ductile cast pipe production, and the filling material is performed during the heat treatment process In the sintering step, in the surface filling step, the filling material is selected on the basis of the highest holding temperature in the heat treatment system, so as to ensure that the highest holding temperature in the heat treatment system is within the sintering temperature range of the filling material, and the filling material Before heat treatment, it is coated on the partial surface of ductile graphite pipe with adhesive. According to the solution provided in this embodiment, when there is no special need, the heat treatment process of the ductile cast pipe and the sintering step of the hole-filling material are all carried out in a heat treatment furnace, su...

Embodiment 2

[0027] This embodiment is a further improvement on the main components of the hole-filling material in Embodiment 1. In this embodiment, the Cu-Sn alloy, Cu-Zn alloy, and Cu-Ni alloy in Embodiment 1 are further selected as Cu-Sn -M alloy (M is a metal element other than Cu and Sn), Cu-Zn-M alloy (M is a metal element other than Cu and Zn), Cu-Ni-M alloy (M is a metal element other than Cu and Ni) metal element).

[0028] The above metal M represents a metal element other than the base metal and the first alloy element, and can represent a metal element or multiple metal elements. M can be based on the sintering performance, mechanical properties or chemical properties of the hole-filling material. It depends on one or more requirements. In this embodiment, M selects sintered anti-shrinkage elements.

Embodiment 3

[0030] This embodiment is an example of further utilization of the characteristics of the ductile cast pipe heat treatment system itself. In this embodiment, the heat treatment system includes at least one first heat treatment process and one second heat treatment process. In the first heat treatment process and the second heat treatment process A cooling process is included between the two heat treatment processes, the surface filling step is performed before the first heat treatment process, and the primary sintering of the hole filling material is performed in the first heat treatment process, and the cooling process is performed on the The surface of the primary sintering is polished and / or replenished with the hole-filling material, and the secondary sintering of the hole-filling material is performed in the second heat treatment process. The characteristic of this embodiment is that, since general ductile graphite pipes often require the cooperation of various heat treatm...

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PUM

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Abstract

The invention relates to a surface treatment process for a spherulitic graphite cast pipe, which comprises a surface pore-filling step and a pore-filling material sintering step, wherein the surface pore-filling step is carried out before a heat treatment process of spherulitic graphite cast pipe production, the pore-filling material sintering step is carried out in the heat treatment process, in the surface pore-filling step, the pore-filling material is selected according to the highest holding temperature in the heat treatment system so as to ensure that the highest holding temperature in the heat treatment system is within the sintering temperature range of the pore-filling material, and the pore-filling material is coated on the local surface of the spherulitic graphite cast pipe through a binder before heat treatment. The heat treatment is one or more of normalizing, annealing and modulating. According to the process, the pore-filling sintering process is subjected to step decomposition, and the pore-filling material sintering step is carried out in the heat treatment process, so that the problems of energy waste, high operation difficulty and poor treatment effect of the traditional pore-filling process are solved, and the selection of the pore-filling material and the adjustment of the sintering characteristics are convenient and flexible.

Description

technical field [0001] The invention relates to the field of casting production of ductile graphite pipes, and more particularly, relates to a surface treatment process after casting of ductile graphite pipes. Background technique [0002] Ductile cast pipe is a common water supply and delivery pipe in engineering. As a large-scale casting, it is a common problem in the casting process that the roughness size is out of tolerance due to the large surface holes and the subsequent poor coating. [0003] At present, hole-filling and sintering is often used in production to deal with the problem of large local pores in ductile graphite pipes. Due to the large size of ductile graphite pipes, the hole-filling and sintering operation cannot directly place the entire casting on the surface after filling the surface holes with metal powder like ordinary castings. The metal powder is sintered in the heating furnace, but only by means of gas or a special electric heating coil to heat th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04B22F5/10B22F3/24
CPCB22F7/04B22F5/106B22F3/24B22F2003/248
Inventor 张希营蔡可辉杨传花柴成林孔德洲陈延民
Owner SHANDONG GUOMING DUCTILE IRON PIPES TECH CO LTD
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