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Method for lost foam casting of composite two-liquor bimetallic hammerhead of crusher

A technology of lost foam casting, double liquid and double metal, which is applied in casting molding equipment, metal processing equipment, casting molds, etc., which can solve the problems of improvement, difficulty in control, and no provision of molten metal pouring temperature, etc., and achieve simple production process and high efficiency high effect

Inactive Publication Date: 2013-01-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1) Although the lost foam casting high chromium cast iron and cast steel composite crusher hammer head is used in this patent, the casting process design uses an inner runner, which will increase the production cost; 2) This patent does not provide two The pouring temperature of the molten metal, in fact, in the preparation of bimetallic materials, the pouring temperature is a very important link in the formation of the thickness of the transition layer or bonding layer in the solidification structure of the two metals; Composition (weight percent): C: 2.8-3.5%, Si: 0.4-1.0%; Mn: 0.8-3.0%; Cr: 18-25%; W: 0-2.5%; S≤0.05%; P≤0.1%
There is no heat treatment process involving the composite hammer head. The hardness value of high-chromium cast iron during use is the key factor determining its wear resistance or service life; 4) This patent involves pouring molten steel made of the hammer handle, and using chilled iron balls at any time Blocking the top of the sprue made of hammer handle, and then pouring high-chromium cast iron molten iron made of hammer head to the top of the riser, adding cold iron balls to the sprue to block the treatment is not conducive to the improvement of production efficiency in the production process
5) The patent involves quantitative pouring when pouring the hammer handle, which is not easy to control in the actual production process, and is also not conducive to the improvement of production efficiency
This is not conducive to simplifying the formulation of the casting process, and will also increase the production cost

Method used

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  • Method for lost foam casting of composite two-liquor bimetallic hammerhead of crusher

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] It is determined that the material of the hammer head part 5 is a high-chromium white cast iron (mainly to improve the wear resistance of the hammer head), and its chemical composition (weight percentage) is: 2.6%C, 15%Cr, 0.5%Mn, 0.5%Si , 0.3%Mo, 0.3%Cu, 0.06%P, 0.06%S, and the rest is Fe.

[0021] Hammer handle part 4 is made of carbon steel (to ensure that the hammer handle has high toughness), and its chemical composition (weight percentage) is: 0.2%C, 0.5%Mn, 0.3%Si, 0.06%P, 0.06%S, and the rest are Fe.

[0022] Such as figure 1 As shown, the foam plastic coated with paint (the thickness of the paint is about 1-2mm, and the paint is Guilin No. 5) is made into a crusher hammer head shape and embedded in the dry sand 2 of the sand box 1, and passed through the sand box in the sand box. The vacuum pipeline 2 is evacuated to a vacuum degree of 0.06MPa;

[0023] Calculate and weigh the above-mentioned high-chromium cast iron and carbon steel smelting raw materials re...

Embodiment 2

[0030] The present embodiment method step is identical with embodiment 1, just wherein some processing parameters are different:

[0031] The chemical composition (percentage by weight) of high chromium white cast iron is: 4.0%C, 35%Cr, 1.50%Mn, 1.5%Si, 1.5%Mo, 1.5%Cu, 0.3%P, 0.2%S, and the rest is Fe. The chemical composition (percentage by weight) of carbon steel is: 0.6%C, 1.50%Mn, 1.5%Si, 0.25%P, 0.28%S, and the rest is Fe.

[0032] Vacuum the sand box to a vacuum of 0.4Mpa.

[0033] The pouring temperature of high chromium cast iron is controlled at 1400°C; the pouring temperature of carbon steel is controlled at 1600°C.

[0034] In the heat treatment process, the temperature is raised to 1000°C at a heating rate of 50°C / hour. According to the maximum wall thickness of the hammer head of 60mm, the holding time at this temperature is determined to be 2 hours.

[0035] In the tempering process, the annealing temperature is 300°C, the heating rate is also controlled at 50°...

Embodiment 3

[0038] The present embodiment method step is identical with embodiment 1, just wherein some processing parameters are different:

[0039] The chemical composition (percentage by weight) of high chromium white cast iron is: 3.2%C, 25%Cr, 0.8%Mn, 0.7%Si, 1.0%Mo, 0.13%P, 0.13%S, and the rest is Fe.

[0040]The chemical composition (weight percentage) of carbon steel is determined as: 0.45%C, 0.8%Mn, 0.6%Si, 0.10%P, 0.07%S, and the rest is Fe.

[0041] Vacuum the sand box to a vacuum of 0.09Mpa.

[0042] The pouring temperature of high chromium cast iron is controlled at 1380°C; the pouring temperature of carbon steel is controlled at 1580°C.

[0043] In the heat treatment process, the temperature is raised to 950°C at a heating rate of 80°C / hour. According to the maximum wall thickness of the hammer head of 40mm, the holding time at this temperature is determined to be 1.5 hours.

[0044] In the tempering process, the annealing temperature is 300°C, the heating rate is also con...

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Abstract

The invention discloses a method for lost foam casting of a composite two-liquor bimetallic hammerhead of a crusher. The method includes: embedding a crusher hammerhead molded body made of foam plastics into dry sand of a sand box, and vacuumizing; then respectively preparing high-chromium iron casting liquor and carbon steel casting liquor; after melting down and deoxidizing the two kinds of metallic casting liquor, performing carbon steel pouring (1300-1400 DEG C) prior to high-chromium iron pouring (1550-1650 DEG C), and rapidly covering high-chromium iron liquor by thermal insulation agents after pouring is completed; subjecting a molded crusher hammerhead casting to thermal treatment at the temperature of 900-1000 DEG C, then rapidly discharging the casting and cooling the casting in air; and tempering at the temperature of 250-300 DEG C finally.

Description

technical field [0001] The invention relates to a method for lost-foam casting a compound hammerhead of a double-fluid double-metal crusher. Background technique [0002] Compared with general sand casting, lost foam casting, such as clay sand, water glass sand, resin sand, etc., greatly simplifies the sand processing system, and the molding sand can be completely reused, without the need for molding sand preparation department and waste sand processing department; Box, no mold taking, greatly simplifies the molding process, eliminates casting defects and waste products caused by mold taking and box closing; no sand core and core making department, eradicates casting defects and waste products caused by core making and core setting ; Shaking sand is extremely easy, greatly reducing the workload and labor intensity of sand shaking. The production efficiency is high, and it is an efficient and energy-saving casting method. [0003] Patent document CN102189245.A proposes a pr...

Claims

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Application Information

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IPC IPC(8): B22D19/16B22C9/04C22C37/06C22C38/04
Inventor 皇志富邢建东高义民马胜强李烨飞
Owner XI AN JIAOTONG UNIV
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