CN104550855A

CN104550855A - Casting technique of imbedding type composite hammerhead

Info

Publication number: CN104550855A
Application number: CN201310514948.4A
Authority: CN
Inventors: 刘升迁
Original assignee: QINGDAO TIANHENG MACHINERY CO Ltd
Current assignee: QINGDAO TIANHENG MACHINERY CO Ltd
Priority date: 2013-10-28
Filing date: 2013-10-28
Publication date: 2015-04-29

Abstract

The invention discloses a casting technique of an imbedding type composite hammerhead, which is the technique for bonding a wear resistant material with a substrate during the solidification of a cast by using the heat of molten metal; the production technique of the hammerhead comprises the following steps: pre-forming a hammer handle, polishing to remove surface impurities, smoothening corner angles, coating protective agent, covering a hammer end evanescent mode, putting into a mould cavity and then filling with sands for moulding; taking out the hammer end evanescent mode after the sands are compact, setting a feeding riser runner on the top of the hammer end, wherein the evanescent modes are adopted in the hammer end, sprue base and ingate, and wood former moulds are adopted in riser, riser neck and sprue; arranging the whole sand mould 3-8J into an induction coil before composting, pre-heating the hammer handle by electromagnetic induction heating principle, starting to cast molten metal when the hammer handle reaches a needed temperature, heating while casting, stopping heating after the mould cavity of the hammer end is full, keeping on casting until the whole riser is full; the technique has the following beneficial effects: (1), by utilizing the in-mould induction heating in the hammer handle, the heating efficiency is high; (2), the atomic diffusion energy is improved; (3) the metal atoms exchanging rate of molten metal and solid surface layer is enhanced; and (4), the location accuracy and size precision of workpiece are guaranteed, the production efficiency is improved, and the working condition is improved.

Description

The casting technique of New Composite Hammer

Technical field

The invention belongs to alloy cast iron casting technology field, be specifically related to a kind of casting technique of New Composite Hammer.

Background technology

Tup is produced and is mostly adopted imbedding process, and its running cost is low, and foundry goods combination property is superior, is a kind of intimate body technique.But existing imbedding process, still there are the following problems mostly: must could form effective metallurgical binding by fixed temperature in tup recombination process.How pin reaches the problem of predetermined temperature, and we devise the technique of casting formula composite hammer head---and In-mold induction heating composite casting technology, since this technique puts into production, effect is fine.The heating process being applied to production at present can be summed up as: a kind of is preheating before pouring into a mould the solid portion of castingin, and another kind is lengthening high-temperature metal is generally heat in heating furnace to the flushing time of solid, takes out cast during cast.Because the efficiency of heating surface is low; it is low that the extremely attached protective agent of castingin part is also difficult to thoroughly to prevent the heavy too much casting of molten metal of the oxygen on surface to be longer than the face efficiency of heating surface to solid portion; waste a large amount of high temperature; on the other hand due to the chilling action of solid portion; molten metal is at surface of solids rapid solidification; produce very large package power owing to solidifying to core, core produces reaction force to it.At this moment very easily there is the imbalance of power in rapid solidification, produces internal fissure.Crackle diffusion in actual use, causes hammer tip to rupture and the block that comes off.

Summary of the invention

In order to overcome the problems referred to above that prior art field exists, the object of the invention is to, a kind of casting technique of New Composite Hammer is provided.

The casting technique of New Composite Hammer provided by the invention, imbedding process is exactly the matrix material of definite shape is fixed on the position that casting mold cavity requires, utilizes the heat of molten metal, makes the technique that high-abrasive material and matrix combine when casting solidification.The production technology of tup.Make hammer handle in advance, surface irregularities is removed in polishing, and corner angle polish, coated protective agent, put hammer tip evaporative pattern and put into die cavity filling moulding.Take out hammer tip evaporative pattern after molding sand consolidation, feeding riser runner is set at hammer tip top.Hammer tip, well and ingate adopt lost pattern, rising head, and riser neck and sprue adopt wooden model model.Before compound, whole sand mold puts 3-8J in people's induction coil, carries out preheating by the principle of electromagnetic induction heating to hammer handle.Start casting of molten metal when hammer handle reaches the temperature of needs, cast limit, limit is heated, and when hammer tip die cavity is full of, stops heating, continues cast until be full of whole rising head.Whole process foamed polystyrene pattern is heated vaporization.After molten metal cooled and solidified, hang out sand mold, shake out.

The casting technique of New Composite Hammer provided by the invention, its beneficial effect is: 1. hammer handle adopts In-mold induction heating, and the efficiency of heating surface is high, heating is convenient, and the heat time easily controls, and surface temperature change is little, and not oxidizable, be conducive to the metallurgical binding at interface; 2. due to the effect of electromagnetic force, molten metal adds the flushing time to solid compound position, improves atoms permeating energy, exchanges probability, thus greatly improve the metallurgical binding at interface between the metallic atom enhancing molten metal and solid skin; 3. molten metal is under the stirring action of electromagnetic force, enhances mobility, makes casting of molten metal at first occur remelting phenomenon at the rapid solidification of the surface of solids, and has broken dendrite end, crystal grain thinning, make whole hammer tip even tissue; 4. whole process hammer handle heats in type, and ensure that accurate positioning and the dimensional accuracy of workpiece, improve production efficiency, work situation improves.

Detailed description of the invention

Below in conjunction with embodiment, to the casting technique of New Composite Hammer provided by the invention, be described in detail.

Embodiment one

Imbedding process is exactly the matrix material of definite shape is fixed on the position that casting mold cavity requires, utilizes the heat of molten metal, makes the technique that high-abrasive material and matrix combine when casting solidification.The production technology of tup.Make hammer handle in advance, surface irregularities is removed in polishing, and corner angle polish, coated protective agent, put hammer tip evaporative pattern and put into die cavity filling moulding.Take out hammer tip evaporative pattern after molding sand consolidation, feeding riser runner is set at hammer tip top.Hammer tip, well and ingate adopt lost pattern, rising head, and riser neck and sprue adopt wooden model model.Before compound, whole sand mold puts 3-8J in people's induction coil, carries out preheating by the principle of electromagnetic induction heating to hammer handle.Start casting of molten metal when hammer handle reaches the temperature of needs, cast limit, limit is heated, and when hammer tip die cavity is full of, stops heating, continues cast until be full of whole rising head.Whole process foamed polystyrene pattern is heated vaporization.After molten metal cooled and solidified, hang out sand mold, shake out.

Adopt the Technology for Heating Processing of quenching ten tempering.Be heated to 960 DEG C, insulation 4h, air blast cooling of coming out of the stove is quenched.When temperature drops to a certain degree, people's stove carries out temper again, to eliminate quenching stress.Temperature 250 DEG C, insulation 2h, air cooling of coming out of the stove.Because composite portion material is different, heating rate is different, easily produces the temperature difference and causes composite bed to ftracture, therefore the rate of heat addition should control certain limit " 100 DEG C/h).

Claims

1. a casting technique for New Composite Hammer, is characterized in that: make hammer handle in advance, and surface irregularities is removed in polishing, and corner angle polish, coated protective agent, put hammer tip evaporative pattern and put into die cavity filling moulding; Take out hammer tip evaporative pattern after molding sand consolidation, feeding riser runner is set at hammer tip top; Hammer tip, well and ingate adopt lost pattern, rising head, and riser neck and sprue adopt wooden model model; Before compound, whole sand mold puts 3-8J in people's induction coil, carries out preheating by the principle of electromagnetic induction heating to hammer handle; Start casting of molten metal when hammer handle reaches the temperature of needs, cast limit, limit is heated, and when hammer tip die cavity is full of, stops heating, continues cast until be full of whole rising head.