Method for repairing bolt hole of cylinder cover

A bolt hole and cylinder head technology, applied in the field of machinery, can solve problems such as waste and scrapped cylinder heads, and achieve the effect of good leak trapping effect and simple operation.

Inactive Publication Date: 2011-05-18
GUANGXI YUCHAI MASCH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If leakage occurs, the cylinder head needs to be scrapped to a large extent, causing great waste

Method used

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  • Method for repairing bolt hole of cylinder cover
  • Method for repairing bolt hole of cylinder cover
  • Method for repairing bolt hole of cylinder cover

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Embodiment Construction

[0018] A specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0019] like Figure 1 to Figure 5 As shown, the cylinder head bolt hole repair method of the present invention is specifically as follows: first, the cylinder head bolt holes that have leaked have been reamed, that is, the bolt holes of Φ15mm are first expanded to Φ17.5mm; and then accurately reamed , that is, the fine reaming of the Φ17.5mm hole is (The tolerance range is -0.045 to -0.02mm), expand the original bolt hole to be repaired by 3mm; then apply repair glue on the enlarged bolt hole, and the repair glue is made of Luo alloy, alloy, ceramics, and diamond powder. Finally, the insert cooled by liquid nitrogen is pressed into the bolt hole, the insert is made of copper material, and the temperature of the liquid ...

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Abstract

The invention discloses a method for repairing a bolt hole of a cylinder cover, which is used for repairing the bolt hole when the bolt hole leaks. The method comprises the following steps of: expanding the bolt hole, to be repaired, of the cylinder cover, namely expanding the diameter of the bolt hole for 2.5 mm; precisely reaming the expanded bolt hole, wherein the diameter of the precisely reamed bolt hole is expanded for 3 mm on the basis of an original size; coating a repair adhesive on the inner wall of the precisely reamed bolt hole; cooling a prepared insert bush which is adapted to the precisely reamed bolt hole in liquid nitrogen; and pressing the cooled insert bush into the bolt hole in which the adhesive is coated, so that the insert bush expands at normal temperature to form interference fit with the bolt hole. In the repair method, only leaky bolt holes need to be repaired, so that the cylinder cover of which the bolt hole has leakage defects can be saved so as not to be scrapped totally, and the cost is low.

Description

technical field [0001] The invention relates to a repair method in the mechanical field, in particular to a repair method for cylinder head bolt holes. Background technique [0002] At present, some engine cylinder heads have leakage defects after processing, the incidence rate is about 1%, and a large part of them is the leakage of bolt holes connecting the cylinder block. If leakage occurs, it will have a great impact on the performance of the engine, so most cylinder head manufacturers have a pressurized water leak test process after processing to judge whether there is leakage. If leakage occurs, the cylinder head needs to be scrapped to a large extent, resulting in great waste. Contents of the invention [0003] The present invention is to overcome above-mentioned defect in prior art, only need repair the bolt hole of leakage, can save the cylinder head that has leakage defect in bolt hole and can not all be scrapped, and cost is low. [0004] The cylinder head bolt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/02
Inventor 李小举郭高李新民黄进达宁科明
Owner GUANGXI YUCHAI MASCH CO LTD
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