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Manufacturing method for steel cracking connecting rod

A manufacturing method and technology for cracking connecting rods, which are applied in the direction of connecting rods, manufacturing tools, casting and molding equipment, etc., can solve problems such as crack bifurcation, cracking, and cross-sectional deformation, so as to improve tearing, reduce cracking force, The effect of reducing processing costs

Active Publication Date: 2015-07-08
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of steel connecting rod internal cracking problem for cracking common forged steel and medium carbon steel which can not be cracked, section deformation, crack bifurcation, etc. The method of inserting gray cast iron to solve the limitation of cracking technology on the selection of connecting rod materials and improve the cracking quality of connecting rods

Method used

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  • Manufacturing method for steel cracking connecting rod
  • Manufacturing method for steel cracking connecting rod
  • Manufacturing method for steel cracking connecting rod

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1 The connecting rod blank is manufactured by the lost foam casting process. The main material of the connecting rod is medium carbon steel 40Cr, which is moderately priced and easy to process. After heat treatment, it can manufacture connecting rod parts that withstand high loads and impacts. Due to its high toughness, brittle cracking cannot be achieved at room temperature and cannot be used for cracking Manufacturing of connecting rods. Gray cast iron chooses HT200, its plasticity and toughness are far lower than steel, and it is easy to be brittle and split. Its melting point is 1145~1250°C.

[0032] Figure 2 is the process diagram of the lost foam casting of connecting rods. The connecting rods are arranged vertically, with the big end of the connecting rod facing downward and the small end facing upward. And sprue 7 adopts the direct molding of wooden formwork. During mold manufacture, at first make the mold of the polystyrene foam mold of connecting rod...

Embodiment 2

[0036] Example 2 An investment casting process is used to manufacture a steel connecting rod blank. The main material of the connecting rod is medium carbon steel 40Cr, which is moderately priced and easy to process. After heat treatment, it can manufacture connecting rod parts that withstand high loads and impacts. Due to its high toughness, brittle cracking cannot be achieved at room temperature and cannot be used for cracking Manufacturing of connecting rods. Gray cast iron chooses HT200, its plasticity and toughness are far lower than steel, and it is easy to be brittle and split. Its melting point is 1145~1250°C.

[0037] Using the investment casting process, firstly, according to the shape of the connecting rod to be manufactured, a wax mold of the connecting rod is made, and a rectangular cavity is opened on the connecting rod body 1 and the connecting rod cover 2 on the connecting rod wax model. To install the gray cast iron sheet 3, and bond the sprue rod and the inn...

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Abstract

The invention discloses a manufacturing method for a steel cracking connecting rod and belongs to the field of manufacturing of engine parts. According to the method, a preheated gray cast iron sheet is prearranged at a cavity at the joint of a connecting rod body and a connecting rod cover when a connecting rod blank is cast; during casting, the interface, contacted with molten steel, of the gray cast iron sheet is fused under the strong action of the molten steel; after condensation, the gray cast iron sheet is combined with steel in a metallurgical mode to manufacture a composite connecting rod blank; and when a cracking process is implemented, a connecting rod cracking groove is arranged in the middle of the gray cast iron sheet, brittle fracture separation of the connecting rod body and the connecting rod cover is realized by utilizing the brittle fracture of gray cast iron, and a natural three-dimensional concavo-convex structure on the fracture surface guarantees precise positioning and assembling of the connecting rod body and the connecting rod cover. By the manufacturing method for the steel cracking connecting rod, various common steel materials can be used for manufacturing the steel cracking connecting rod, the brittle fracture separation of the connecting rod and the connecting rod cover is realized at normal temperature, and the process of processing the combined surface by a mechanical grinding method is avoided, so that the manufacturing process is simplified and the manufacturing cost is reduced.

Description

technical field [0001] The invention belongs to the field of engine component manufacturing, and in particular relates to a manufacturing method of a steel cracking connecting rod. Background technique [0002] The connecting rod is one of the key components of the engine, and it is subjected to high-frequency alternating loads during its operation. Therefore, the connecting rod must have sufficiently high strength, stiffness and comprehensive mechanical properties. The traditional connecting rod adopts the split processing method. After the connecting rod blank is forged as a whole, the joint surface of the connecting rod body and the connecting rod cover is processed by sawing, milling, grinding, etc., and the positioning pin holes of the connecting rod cover and the bolts of the connecting rod body are finished. Complete the combination of the two after the hole. The traditional method has many procedures, low efficiency, high product rejection rate, and poor carrying ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/14B22D19/16B22C9/02B22C9/04C21D8/00C21D9/00F16C7/02
Inventor 姜银方龙昆姜文帆万鹏
Owner JIANGSU UNIV
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