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Method of in situ synthetic steel bond hard alloy casting composite hammerhead and hammerhead

A technology of steel-bonded hard alloy and composite hammer head, which is applied in the direction of grain processing, etc., can solve the problems of complex casting process, hammer head failure, narrow application range, etc., and achieve wear-resistant alloy without falling off, good surface quality and low cost. low effect

Inactive Publication Date: 2012-04-25
KING STRONG MATERIAL ENG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Chinese patent of CN1307017C discloses a composite material hammer head and its casting method. First, the metal matrix material is smelted in an electric furnace to form a molten metal, and then WC particles are mixed with a binder to form a paste and placed in the cavity of the hammer head mold. The end face side of the vertical centrifugal casting machine is formed after drying to form a prefabricated layer. Start the vertical centrifugal casting machine to control its speed, and then pour the molten metal. After pouring, increase the speed of the vertical centrifugal casting machine, rotate for 3-10 minutes, and stop for cooling. This method is simple to form, and the matrix is ​​protected from further wear due to the high hardness and high wear resistance of the ceramic particles in the composite material layer. The impact effect of the hammer head often causes the separation of the composite material layer and the metal matrix during the actual operation of the hammer head, resulting in premature failure of the hammer head
The disadvantage of this method is that the casting process is very complicated and cumbersome, and the hammerhead manufactured by this method has a very narrow application range and is only suitable for crushers that crush quartz rocks.

Method used

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  • Method of in situ synthetic steel bond hard alloy casting composite hammerhead and hammerhead
  • Method of in situ synthetic steel bond hard alloy casting composite hammerhead and hammerhead
  • Method of in situ synthetic steel bond hard alloy casting composite hammerhead and hammerhead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1: Weigh 0.5 kg of Ti powder with an average particle size of 5 μm, 0.2 kg of 5 μm graphite powder, 0.2 kg of 3-4.5 μm W powder and 2-20 μm metal powder (Ni: 60% wt, Cr: 5% wt , Cu: 5% wt, B: 3% wt, all the other being Fe) 0.2kg, mixed in ball mill for 4 hours;

[0041] Step 2: Add 50g of polyvinyl alcohol (concentration 8%wt) aqueous solution to the mixed powder, stir and mix to make a powder coating paste;

[0042] Step 3: Cut out 5 grooves with a width of 20 mm and a depth of 60 mm in the working part of the EPS foam plastic model prepared in advance, and fill the grooves with powder coating paste;

[0043] Step 4: Hang a magnesia powder anti-sticking sand coating about 2mm thick on the outside, and dry it at 45°C for 36 hours;

[0044]Step 5: Assemble the pouring device, smelt the high-chromium cast iron molten steel and vacuumize it for pouring. The pouring temperature is 1400-1500 ℃ and the vacuum degree is 0.06MPa. During the pouring process, the high tempe...

Embodiment 2

[0047] Step 1: Weigh 0.25 kg of Ti powder with an average particle size of 15 μm, 0.15 kg of graphite powder of 10 μm, 0.1 kg of W powder of 5.5 μm and metal powder of 10-80 μm (Ni: 20% wt, Cr: 30% wt, Cu : 10%wt, the rest is Fe) 0.1kg, mixed in ball mill for 4 hours;

[0048] Step 2: Add 30g of polyvinyl alcohol (concentration 8%wt) aqueous solution to the mixed powder, stir and mix to make a powder coating paste;

[0049] Step 3: Cut out three 15mm wide and 40mm deep grooves in the working part of the EPS foam plastic model of the hammer head casting prepared in advance, and fill the grooves with powder coating paste;

[0050] Step 4: Hang a magnesia powder anti-sticking sand coating about 2mm thick on the outside, and dry it at 45°C for 24 hours;

[0051] Step 5: Insert the pre-made carbon steel, alloy steel or high manganese steel hammer handle into the hammer head mold. If necessary, the hammer handle should be treated with hard alloy coating to increase wear resistance;...

Embodiment 3

[0055] Step 1: Weigh 0.1 kg of Ti powder with an average particle size of 20 μm, 0.15 kg of 10 μm graphite powder, 0.6 kg of 2.5 μm W powder and 15-64 μm metal powder (Co: 20% wt, Cr: 20% wt, B : 8%wt, Si: 5%wt, all the other are Fe) 0.1kg, mix 4 hours in ball mill;

[0056] Step 2: Add 30g of polyvinyl alcohol (concentration 8%wt) aqueous solution to the mixed powder, stir and mix to make a powder coating paste;

[0057] Step 3: Drill densely distributed ￠10-￠20 mm holes on both sides and the bottom surface of the working part of the EPS foam plastic model prepared in advance, and the hole depth is 15-40 mm, and fill the powder coating paste in the holes;

[0058] Step 4: Hang a magnesia powder anti-sticking sand coating about 2mm thick on the outside, and dry it at 45°C for 48 hours;

[0059] Step 5: Assemble the pouring device, smelt the molten Mn13 high manganese steel and vacuumize it for pouring. The pouring temperature is 1400-1500°C and the vacuum degree is 0.06MPa. D...

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Abstract

A method of an in situ synthetic steel bond hard alloy casting composite hammerhead adopts a vacuum lost foam casting technology, wherein Ti powder, graphite powder, W powder and metal powder are mixed, and are added with an adhesion agent to produce a powder coating paste, the powder coating paste is filled in a reinforcement groove or a hole of a working part of an expanded poly styrol (EPS) foaming plastic modal of a hammerhead casting, during the pouring process, the high temperature of liquid steel is utilized to initiate the self propagating synthesis reaction, the reactions of Ti plus C->TiC and W plus C->WC are carried out, so the TiC and WC-based hard alloy phases are formed, the liquid steel is filled into the clearance of a hard phase, so an in situ synthetic titanium carbide and tungsten carbide steel bond hard alloy is obtained, and the hard alloy is embedded in the steel base body of the working part of the hammerhead. When the hammerhead which is produced through the method of the in situ synthetic steel bond hard alloy casting composite hammerhead is used, because the hard alloy and the casting are completely, metallurgically and firmly combined together, the hammerhead has high wear resistance and impact resistance during the use, has a simple technological process, low production cost, and is applicable to large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of metal matrix composite workpiece preparation, in particular to a method for manufacturing a hammer head of a hammer crusher with high wear resistance and long service life. Background technique [0002] Hammer crusher is a kind of crushing machine that directly crushes materials with a maximum particle size of 600-1800 mm to 25 mm or less. The crushed materials are ore, coal, salt, chalk, gypsum, brick tiles, limestone, etc. . Since the hammer crusher is widely used in mineral processing, building materials, chemical industry, electric power, metallurgy and other industrial sectors, its workload is extremely heavy and the working conditions are extremely harsh. The core component of the hammer crusher is the wear-resistant hammer head. The hammer head is its main wearable part, which consumes a lot. Therefore, the quality of the hammer head directly affects the production cost and work efficiency of the ...

Claims

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Application Information

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IPC IPC(8): B22D19/16B02C13/28
Inventor 王振明程军冯凤鸣周生永郭志猛王刚杨永义
Owner KING STRONG MATERIAL ENG LTD
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