CN102581215A

CN102581215A - Casting method for glass mould blank

Info

Publication number: CN102581215A
Application number: CN2012100697079A
Authority: CN
Inventors: 马建华; 周冰; 苏秋君; 夏建新
Original assignee: CHANGSHU JIANHUA DIE SETS Co Ltd
Current assignee: CHANGSHU JIANHUA DIE SETS Co Ltd
Priority date: 2012-03-16
Filing date: 2012-03-16
Publication date: 2012-07-18

Abstract

A casting method for glass mould blank belongs to the field of glass mould casting and comprises first manufacturing a wooden model base plate provided with a pair of bottle moulds, a pouring gate mould, a pouring channel mould and a filter screen according to the size of the glass mould blank; then arranging a model frame cover on the wooden model base plate, and filling pulverized coal sand in a containing cavity of the model frame; overturning the model frame filled with the pulverized coal sand and the wooden model base plate together, removing the wooden model base plate to obtain a casting mould, and arranging the filter screen into the filter screen cavity; arranging a pair of cold iron cores onto bottle mould cavities; pouring melted iron water from the pouring gate, enabling the iron water sequentially pass through the pouring channel to be filtered by the filter screen to enter the bottle mould cavities, and removing the cold iron cores, the model frame and the pulverized coal sand till the liquid level of the iron water reaches the horizontal height identical with the upper plane of the pouring gate to obtain the glass mould blank. The casting method for the glass mould blank has the advantages of improving casting efficiency of the glass mould blank, can not cause body hurt to an operator, ensures physical properties of a glass mould, has economic efficiency, and can ensure the quality of a cast.

Description

The casting method of glass die blank

Technical field

The invention belongs to the glass mold casting technology field, be specifically related to a kind of casting method of glass die blank

Background technology

such as industry the reason of knowledge; Because the glass mold inner chamber needs fine and close chill; Thereby glass die blank all will obtain through the method for casting usually, and the casting technique of generally using at present is to adopt green-sand and be last nowel casting technique, wherein; Top box is combined by foundry goods die cavity, corresponding cast gate, ingate, filter screen and rising head, and nowel is then placed chill mud Job's tears.Owing to last nowel mould assembling green-sand casting technique is produced foundry goods and enough big feeding head need be set be used and guarantee enough molten metal supplies; Therefore cause the utilization rate of molten iron lower; Usually between 60-75%, cause die manufacturing cost to increase, waste raw material and the energy; Go up simultaneously the bump that nowel receives long-term sand removal link and cause position error in the mould assembling link; Make the inner chamber and the cylindrical of glass die blank produce inclined to one side loam core phenomenon; So-called loam core phenomenon partially deviation occurs with regard to the concentricity that is meant inner chamber and cylindrical; The became uneven that causes mould causes defective product and even scraps.

are in order to avoid the die blank eccentric phenomena and to improve the molten iron utilization rate effectively; In disclosed patent documentation, corresponding report is arranged; " by the method for resin sand single box head-free casting glass mold " of typically recommending like CN101823121B, this method is used green sand molding instead phenolic sand molding, and the change casting system is cast into single case; Thereby solved the eccentric problem of mould, the manufacturing cost that has improved the utilization rate of molten iron and reduced mould.

still; Still there is following shortcoming in above-mentioned CN101823121B: the one, and the casting efficient of glass die blank is not high; All there is defective because constitute the phenolic resins and the isocyanate resin self of resin sand, though for example phenolic resins has the strong point of Heat stability is good, because it also is good heat-insulation material simultaneously; So the time that causes glass die blank in sandbox, to be cooled off is tediously long, influences production efficiency; The 2nd, lose environmental protection; Because in the use of resin sand; The material that produces because of high temperature produces stimulation and damage to the workman's eyes and the upper respiratory tract; Low concentration causes sheds tears and coughs, and high concentration can cause furious swollen and chemical burn, and has the anxiety of destroying schneiderian membrane, making anosmia and damage upper respiratory tract mucosa; The 3rd, to the certain influence of formation generation of D type graphite, be unfavorable for promoting the physical property of glass die blank, because D type graphite is to be known as a kind of preferably glass mold graphite structure in the industry; And D type graphite is a kind of undercooled graphite; Need under bigger degree of supercooling, could produce, and the insulation effect of standing out from one's fellows of resin sand has reduced the generation of D type graphite greatly, especially the long material grains that causes easily of temperature retention time is thick; Phenomenons such as mechanical property reduces, and hardness is on the low side; The 4th, lose economy, because, occupy high thereby cause casting cost because the cost of material of formation resin sand is all comparatively expensive; The 5th, the utilization rate of molten iron still is not enough to reach gratifying degree, because owing to there is gating pattern, after casting is accomplished, need and melt down again the gating pattern excision; The 6th,, there is the anxiety of the thick and casting deformation of casting crystalline grain, because molten iron can produce greater impact to molding sand when two ingates get into, thereby cause cast crystal grain thick and follow metaboly to a certain extent.

In view of the existing defective of above-mentioned prior art, the applicant has carried out experiment repeatedly, and the technical scheme that will introduce below produces under this background

Summary of the invention

task of the present invention is to provide a kind of and helps further to improve the utilization rate of molten casting iron and use the economical with materials and the energy; Help protecting environment and use and avoid operator's health is exerted an influence; Be of value to the formation that ensures D type graphite and use the physical property that improves die blank; Have and be convenient to embody economy and use the casting method that reduces casting cost and the glass die blank that the concentricity of being good at preventing eccentric phenomena and using the inner chamber of guaranteeing blank and cylindrical is arranged.

task of the present invention is accomplished like this, and a kind of casting method of glass die blank, this method are at first produced the wooden mold base plate with a pair of bottle mould, gating pattern, running channel mould and screen pack mould by the glass die blank size; Then the type mask is placed on the wooden mold base plate, and in the cavity volume of type frame, insert coal dust sand; The type frame that then will insert coal dust sand overturns 180 ° together with the wooden mold base plate, and removes the wooden mold base plate, obtains having the casting mold in a pair of bottle die cavity, cast gate, running channel and screen pack chamber, and screen pack is inserted in the screen pack chamber; Then a pair of chill loam core is placed on bottle die cavity; Molten iron with fusion pours into from cast gate at last; After running channel and screen pack filtration, get in the bottle die cavity successively, treat that the liquid level of molten iron reaches with the corresponding to level height in last plane of cast gate and after cooling, remove chill loam core, type frame and bug dusting sand; Obtain glass die blank; Described coal dust sand is made up of the raw material of following parts by weight: quartz sand 98.5-99 part, bentonite 1-1.5 part, coal dust 0.5-1 part.

in a concrete embodiment of the present invention, described bentonite is sodium bentonite or calcium-base bentonite.

in another concrete embodiment of the present invention, described coal dust sand is that coal dust is used in the green casting of satisfying the technical indicator of Chinese mechanical industry standard JB/T9222-2008 standard criterion.

in another concrete embodiment of the present invention, described screen pack is a foam ceramic filter.

technical scheme provided by the invention is owing to used the resin sand in the prior art instead coal dust sand; And there is not the defective of the phenolic resins that constitutes resin sand in coal dust sand; Thereby can improve the casting efficient of glass die blank, can not constitute the health infringement to the operator; Because the coal dust sand facies help to make foundry goods to form D type graphite, thereby ensure the physical property of glass mold for resin sand; Because coal dust sand is cheap, thereby has economy; Owing to there is not the thick and metaboly of casting crystalline grain, and molten iron can not produce coal dust sand sand mold and impact, thereby can ensure casting quality.

Description of drawings

Fig. 1 is the process flow diagram of the inventive method.

The specific embodiment

Embodiment 1:

are by technological process shown in Figure 1.

Dimensional requirement on the glass die blank drawing that at first provide by the user is had the wooden mold base plate 1 of a pair of bottle mould 11, gating pattern 12, running channel mould 13 and screen pack mould 14 by wooden model workman processing; Then type frame 2 covers are placed on the wooden mold base plate 1, and in the cavity volume of type frame 2, insert coal dust sand 3; The type frame 2 that then will insert coal dust sand 3 is together with 180 ° of wooden mold base plate 1 upsets; And remove wooden mold base plate 1; Obtain having the casting mold in a pair of bottle die cavity 111, cast gate 121, running channel 131 and screen pack chamber 141, and material is inserted in the screen pack chamber 141 for the screen pack 1411 of pottery; Then a pair of chill loam core 4 is placed on bottle die cavity 111; Molten iron with fusion pours into from cast gate 121 at last; Molten iron gets in the bottle die cavity 111 through running channel 131 and screen pack 1411 (being filtered by screen pack) successively; Treating that the molten iron liquid level then shows when reaching the last plane corresponding to level height with cast gate 121 has been full of molten iron in bottle die cavity 111; Remove chill loam core 4, type frame 2 and bug dusting sand 3, obtain glass die blank 5, wherein; Aforesaid coal dust sand 3 is that the raw material by following parts by weight constitutes: 1 part of the coal dust that 99 parts of quartz sands, 1.5 parts of sodium bentonites and the green casting of satisfying the technical indicator of Chinese mechanical industry standard JB/T9222-2008 standard criterion are used.In the present embodiment, why the applicant chooses coal dust is 1 part (parts by weight) and to choose bentonite be 1.5 parts (parts by weight), if be because coal dust surpasses 1 parts by weight, is prone to make foundry goods to produce pore; Equally, if bentonite surpasses 1.5 parts by weight, then can influence gas permeability, gas is difficult to from casting mold, overflow, and causes foundry goods to produce defectives such as pore.

Embodiment 2:

The parts by weight of quartz sand that only will constitute the raw material of coal dust sand 3 change 98.5 parts into; Change the parts by weight of coal dust into 0.5 part; Change bentonitic parts by weight into 1 part, through the applicant experiment showed, if the parts by weight of coal dust less than 0.5 part; Then molten iron can infiltrate in the sand mold, thereby can influence surface quality of continuous castings; Equally,, produce the drop defective, make mould strength poor if bentonitic parts by weight less than 1 part, can influence adhesion strength so.All the other are all with the description to embodiment 1.

Embodiment 3:

change the parts by weight of quartz sand, bentonite (using calcium-base bentonite instead) and coal dust into 98.8 parts, 1.3 parts 0.7 part respectively, and all the other are all with the description to embodiment 1.

Embodiment 4:

Change the parts by weight of quartz sand, bentonite and coal dust into 98.6 parts, 1 part 0.65 part respectively, all the other are all with the description to embodiment 1

Claims

1. the casting method of a kind of glass die blank is characterized in that this method at first produces the wooden mold base plate (1) with a pair of bottle mould (11), gating pattern (12), running channel mould (13) and screen pack mould (14) by the glass die blank size; Then type frame (2) cover is placed on the wooden mold base plate (1), and in the cavity volume of type frame (2), insert coal dust sand (3); The type frame (2) that then will insert coal dust sand (3) is together with 180 ° of wooden mold base plate (1) upsets; And remove wooden mold base plate (1); Obtain having the casting mold of a pair of bottle die cavity (111), cast gate (121), running channel (131) and screen pack chamber (141), screen pack (1411) is inserted in the screen pack chamber (141); Then a pair of chill loam core (4) is placed on bottle die cavity (111); Molten iron with fusion pours into from cast gate (121) at last; After running channel (131) and screen pack (1411) filtration, get in the bottle die cavity (111) successively, treat that the liquid level of molten iron reaches with the corresponding to level height in last plane of cast gate (121) and after cooling, remove chill loam core (4), type frame (2) and bug dusting sand (3); Obtain glass die blank (5); Described coal dust sand (3) is made up of the raw material of following parts by weight: quartz sand 98.5-99 part, bentonite 1-1.5 part, coal dust 0.5-1 part.

2. the casting method of glass die blank according to claim 1 is characterized in that described bentonite is sodium bentonite or calcium-base bentonite.

3. the casting method of glass die blank according to claim 1 is characterized in that described coal dust sand (3) is that coal dust is used in the green casting of satisfying the technical indicator of Chinese mechanical industry standard JB/T9222-2008 standard criterion.

4. The casting method of glass die blank according to claim 1 is characterized in that described screen pack is a foam ceramic filter