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Slender oil passage core and manufacturing process thereof

A slender oil channel technology, applied in the field of slender oil channel core and its manufacturing process, can solve the problem that the strength and refractoriness requirements of the slender oil channel core cannot be met, the slender oil channel core is easily deformed or Fracture, failure to meet the application requirements of the oil channel core, etc., to achieve the effect of meeting special performance requirements, high refractoriness, and high strength refractoriness

Inactive Publication Date: 2015-07-15
SICHUAN XIANGYE MASCH CASTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the single type of coated sand currently on the market can meet the strength and refractoriness requirements of the existing oil channel core, it still cannot meet the strength and refractoriness requirements of this elongated oil channel core, so a single type of coated sand is used The slender oil channel core produced is easy to deform or break, and the casting oil channel is easy to stick to sand
Although there are coated sands with higher strength (no deformation or fracture of the oil channel core) and higher refractoriness (non-sticky sand in the casting) on ​​the market, this coated sand has a large amount of gas generation, so it is used to produce The slender oil channel core does not meet the application requirements of the oil channel core because all of them have air holes

Method used

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  • Slender oil passage core and manufacturing process thereof
  • Slender oil passage core and manufacturing process thereof
  • Slender oil passage core and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The slender oil passage core is manufactured according to the following steps:

[0025] (1) Sand mixing: take the following two kinds of coated sand: coated sand A, the parameters are as follows: particle size 40 / 70 mesh, three-sieve concentration ≥80%, fine powder content ≤0.3%, hot tensile resistance ≥1.0MPa , Discretionary reduction ≤1.8%, gas generation ≤12.5ml / g; coated sand B, the parameters are as follows: particle size 50 / 100 mesh, three-sieve concentration ≥80%, fine powder content ≤1.0%, hot tensile strength ≥2.0 MPa, discretionary reduction ≤3.7%, gas generation ≤24ml / g; take 60% by weight of coated sand A and 40% by weight of coated sand B into the sand mixing equipment, and mix 30-90 Seconds, then put it into the core machine shooter for use;

[0026] (2) Mold closing: close the mold, send electricity and heat, the working temperature of the core box is 190~230℃;

[0027] (3) Core shooting: The sand shooting pressure is controlled within the range of 0.35 ~ 0.6 ...

Embodiment 2

[0030] Follow the steps of Example 1, except that in step (1), 50% by weight of the coated sand A and 50% by weight of the coated sand B are poured into the sand mixing equipment, and the other steps are exactly the same.

Embodiment 3

[0032] Follow the steps of Example 1, except that in step (1), 70% by weight of coated sand A and 30% by weight of coated sand B are poured into the sand mixing equipment. The other steps are exactly the same.

[0033] Such as image 3 with Figure 4 As shown, the traditional oil passage core mainly has two structures: a wide oil passage core 4 and a square oil passage core 5. The oil passage cores of the two structures are thin-walled and shorter, with a minimum cross-sectional area of ​​200mm 2 , The total length of both ends including the core 1 does not exceed 160mm. The existing oil passage core is made of SD-2B coated sand produced by Chengdu Changjiang Modeling Materials Co., Ltd., which can meet the requirements of use.

[0034] Compare figure 1 , figure 2 The elongated oil passage core and image 3 , Figure 4 It can be seen that the cross-sectional area of ​​the slender oil passage core of the present invention is much smaller and the total length is much longer. There...

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Abstract

The invention discloses a slender oil passage core. The slender oil passage core is formed through jetting coated sand, wherein the coated sand comprises coated sand A and coated sand B, wherein the parameters of the coated sand A are as follows: the grain size is 40-70 meshes, the three-screened concentration is not lower than 80%, the micropowder content is not higher than 0.3%, the thermal-state tensile strength is not smaller than 1.0MPa, the discretionary reduction amount is not higher than 1.8%, and the gas evolution volume is not greater than 12.5ml / g; the parameters of the coated sand B are as follows: the grain size is 50-100 meshes, the three-screened concentration is not lower than 80%, the micropowder content is not higher than 1.0%, the thermal-state tensile strength is not smaller than 2.0MPa, the discretionary reduction amount is not higher than 3.7%, and the gas evolution volume is not greater than 24ml / g. The invention further discloses a process for manufacturing the slender oil passage core, wherein the process comprises the following steps of mixing sand; matching molds, wherein the working temperature of a core box is 190-230 DEG C; jetting the core, wherein the sand jetting pressure is controlled to be 0.35-0.6 MPa, and the curing time is 40-80 seconds. According to the process, the characteristics of the two kinds of coated sand are integrated, so that the obtained oil passage core has the advantages of small gas evolution volume, low price, high strength and high refractoriness and can meet the special quality requirements of slender oil passage cores.

Description

Technical field [0001] The invention relates to an oil passage core, namely its manufacturing process, in particular to a single root with a minimum cross-sectional area as low as 100mm 2 , The longest slender oil passage core with a total length of 350mm at both ends and its manufacturing process. Background technique [0002] In the casting production process of the crankcase of the automobile engine, the casting model is usually composed of the main core, the water channel core, the oil channel core, the outer core and the end core, etc., into an integral model. Among them, since the oil passage cores are relatively small and are surrounded by molten iron during pouring, the requirements for the oil passage cores are high strength, high refractoriness, and small gas evolution. The existing oil passage core is a square, short structure, and is formed by a single type of coated sand. The advantages of this coated sand are low price, small gas generation (no porosity in the casti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/10B22C1/00B22C15/24
Inventor 谢许祥宋威尹华元
Owner SICHUAN XIANGYE MASCH CASTING CO LTD