CN101559475A

CN101559475A - Waist-shaped insulated feeder

Info

Publication number: CN101559475A
Application number: CNA2009100985996A
Authority: CN
Inventors: 谢锦荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-18
Filing date: 2009-05-18
Publication date: 2009-10-21
Anticipated expiration: 2029-05-18
Also published as: CN101559475B

Abstract

The invention discloses a waist-shaped insulated feeder, which comprises side walls and a top wall; the top wall is provided with an air outlet; and the top wall is provided with strip protrusions protruding downwards on two sides of the air outlet. The technical proposal adopts reinforced structures on the waist-shaped long side part and two sides of the air outlet, thereby improving the local rupture strength of the top wall of the insulated feeder.

Description

A kind of waist-shaped insulated feeder

Technical field

The invention belongs to casting field, particularly relate to a kind of dark insulated feeder of in casting technique, using of waist shape.

Background technology

In casting process, after pouring metal melt is gone into casting mold, because cooled and solidified, transfer to solid-stately by liquid state, produce volume contraction.When volume contraction can not get molten metal and replenishes, after solidifying, the bigger position of modulus can produce shrinkage cavity and shrinkage porosite in the foundry goods.For the bigger casting alloy of those volume contractions, this defective often takes place.Shrinkage cavity and shrinkage porosite can reduce foundry goods compactness, reduce the net sectional area of foundry goods, mechanical property is reduced greatly, therefore must manage control and solidify, prevent that defective from producing.Use rising head, be at present in casting industry control solidify, effective, the most universal technological measure of compensate for shrinkage.

The main effect of rising head is feeding, produces shrinkage cavity to prevent parts.Rising head also has following effect:

1) scavenging action.A large amount of gases during cast in the die cavity are by rising head successfully outside the discharge type;

2) collection slag effect.Because rising head is located at cast top usually, the slag come-up accumulates in the rising head;

3) rising head can be used as liquid metal and fills with sign of die cavity etc.

Rising head will reach the purpose of feeding foundry goods, must satisfy following primary condition:

1) must be within effective feeding distance;

2) modulus of rising head must be greater than the modulus of foundry goods, and promptly the setting time of rising head must be longer than the setting time of foundry goods;

3) to there be the molten metal of q.s to supply with feeding foundry goods usefulness in the rising head;

4) the feeding passage between rising head and foundry goods will guarantee unimpeded at solidificating period.

Whether rising head is covered by molding sand according to its top can be divided into open riser and blind riser, open riser is because need add coverture from the outside, institute thinks that cylinder tube shape or circular cone are tubular, and blind riser is not because need to add coverture in sand mold inside, so only leave venthole at the top.

Common sand mold rising head is because heat-sinking capability is stronger, and the heat conduction and the thermal radiation loss of riser metal are big, and setting rate is fast, and its feeding efficiency only is 10%～14%, and most riser metals are actually a kind of reactive power consumption.In order to improve feeding efficiency, effective measures are that riser metal is incubated, produced insulated feeder thus, so-called insulated feeder is made by the material with good accumulation of heat and fire resistance, adopt insulated feeder can reduce heat loss, prolong the molten metal setting time, enlarge the feeding passage, the amount of metal that the feeding effect does not directly take place is reduced to very low limit, thereby improve feeding efficiency and product yield.

Waist shape blind riser in the existing insulated feeder comprises sidewall and roof, is provided with venthole on roof, and general employing waits the wall thickness structure, and venthole is positioned at the extreme higher position.During cast, molten metal enters die cavity, a large amount of gases in the die cavity are by outside the venthole ground discharge type of blind riser, in gas discharge process, gas in the die cavity is subjected to squeezing of molten metal to pour blind riser first, so because less high pressure that can produce of the venthole of blind riser far above external atmosphere pressure, moreover when gases are heated, they expand in the die cavity has more improved air pressure in the blind riser, although that gas pressure is all directions is identical, but because the main direction of gas flow makes progress, so the roof of blind riser especially venthole position and waist shape long leg position will bear gas pressure much larger than sidewall, and adopt the above-mentioned wall thickness structure that waits, the rupture strength at each position of blind riser is identical, thereby exist around the venthole and ftracture easily even come off and influence the problem of casting quality in the waist shape long leg position of roof, if the thicker rising head of employing wall thickness waste material again.

Publication number is that the patent documentation of CN1748905A discloses a kind of fiber composite heat insulation riser sleever production technology, with No. 6 quartz sands is major ingredient for 700～860 kilograms, add 50～90 kilograms of aluminosilicate fiber cotton particles, 30～60 kilograms of mineral wool particles, 30～60 kilograms of paper particles, with 30～90 kilograms of food starch as binding agent, with above-mentioned raw materials in proportion weighing pour in the agitator to stir and to add an amount of water and break into slurry, use vacuum filtering shape process then, drying below 300 ℃ with using residual heat from kiln furnace, becoming inherent uniform particles has space network, has light weight, high temperature resistant, the fiber composite heat insulation riser sleever that heat-insulating property is strong.

Summary of the invention

In order to solve above-mentioned technical problem, the purpose of this invention is to provide a kind of waist-shaped insulated feeder, adopt ruggedized construction in the waist shape long leg position and the venthole both sides of roof, thereby improve the local rupture strength of insulated feeder roof.

To achieve the above object, the present invention has adopted following technical scheme:

A kind of waist-shaped insulated feeder comprises sidewall and roof, and roof is provided with venthole, and described roof is formed with the strip projected parts of downward protrusion in the both sides of venthole.

Strip projected parts is set has improved the waist shape long leg position of roof and the local rupture strength around the venthole, make insulated feeder the problem that roof ftractures or comes off in use can not occur, and because strip projected parts is to protrude downwards, and the rising head roof is waist shape, a venthole high position is not outstanding, gas in the die cavity most of can arrival earlier in discharge process divided to the strip projected parts both sides after the roof strip projected parts hinders like this, flow along strip projected parts two side direction venthole positions again until discharge, prolonged the time of staying of gas in insulated feeder so to a certain extent, can play increases gas pressure and the effect that reduces interior gas of rising head and ambient atmos heat exchanger effectiveness in the rising head, the former can increase the feeding pressure of rising head inner metal liquid, the latter can prolong molten metal setting time in the rising head, and the both can improve the feeding efficiency of rising head.

As preferably, the both sides of described strip projected parts form slope and roof rounding off, the formation slope, two ends and the roof rounding off of described strip projected parts.Can suitably reduce the obstruction that strip projected parts is discharged gas like this, avoid it, influence casting quality because of being subjected to impact than ftractureing greatly and coming off.The slope slope angle of above-mentioned strip projected parts both sides is 25 °～45 °; The slope slope angle at above-mentioned strip projected parts two ends is 30 °～60 °.Improving feeding efficiency and avoiding between the strip projected parts cracking balance preferably being arranged like this.

As preferably, the slope angle on the slope of above-mentioned strip projected parts both sides is 30 °; The slope slope angle at above-mentioned strip projected parts two ends is 45 °.

As preferably, above-mentioned insulated feeder material by weight percentage, component is as follows: silica flour 84%～87%, paper slag 3.5%～4.5%, mineral wool 4.5%～6%, starch 4.5%～6%.Wherein, silica flour is refractory material, and its enough content has guaranteed the refractoriness of insulated feeder; Mineral wool is a refractory material, is fibrous, forms space network after the rising head moulding, mainly is full of other materials such as silica flour in this space network; The paper slag is the paper fiber, can replenish the formation of the space network that promotes mineral wool first, second can combustion heating under the high temperature of contacting metal liquid, reach the effect that improves the riser regenerator heat insulation effect; Starch is bonding agent, guarantees the space network firm stable of rising head inside, and silica flour is evenly distributed in this space network also in conjunction with firm.

Insulated feeder material component of the present invention is the patent documentation of CN1748905A with respect to publication number, has saved the aluminosilicate fiber cotton particle, and adopts silica flour to replace 6# quartz sand.Role is essentially identical in original prescription though the aluminosilicate fiber cotton particle is different with mineral wool particle composition, all be under the bonding effect of bonding agent, to form the stable and stereoscopic network structure, the present invention only adopts mineral wool, has reduced material composition, has reduced material cost; The granularity of 6# quartz sand is 40～80 orders, and the present invention adopts silica flour (its fineness is more than 120 orders), thereby has better associativity and compactness with mineral wool and bonding agent, has improved the refractoriness and the heat insulation and preservation effect of insulated feeder greatly.And, material mixture ratio of the present invention has had a balance preferably between refractoriness, heat accumulation and the rupture strength of insulated feeder, thereby have certain performance boost with respect to prior art, make it not only can satisfy the high requirement of casting technique, and reduced manufacturing cost.The unit weight of insulated feeder material of the present invention is 800～850kg/m ³Refractoriness is greater than 1600 ℃, strength at normal temperature is greater than 0.85Mpa (adopt the rupture strength of position of above-mentioned ruggedized construction higher), and thermal conductivity factor is less than 0.3W/mK, and the feeding efficiency of insulated feeder of the present invention can improve 5%～7% with respect to prior art.

As preferably, above-mentioned silica flour is that fineness is the rough silica flours of 600～900 purposes, the quartzy waste material powder that perhaps quartzy building stones adopt water law production and are left through 600 eye mesh screens screening back.These silica flours are lower with respect to 6# quartz sand cost, and especially the latter is twice laid fully, greatly reduces material cost, and more help bonding forming because of impurity such as wherein containing clay.

As preferably, above-mentioned starch is cornstarch, draws materials conveniently, reduces cost.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the rearview of Fig. 1.

Fig. 3 is the A-A cutaway view of Fig. 2.

Fig. 4 is the B-B cutaway view of Fig. 2.

Fig. 5 is the upward view of Fig. 1.

Fig. 6 is the side view of Fig. 1.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is made a detailed explanation.

Embodiment 1:

As Fig. 1～a kind of waist-shaped insulated feeder shown in Figure 6, comprise sidewall 3 and roof 1, roof 1 is provided with venthole 2, and described roof 1 is formed with the strip projected parts 4 of downward protrusion in the both sides of venthole 2.The both sides of described strip projected parts 4 form slope and roof 1 rounding off, and the two ends of described strip projected parts 4 form slope and roof 1 rounding off.The slope angle on the slope of described strip projected parts 4 both sides is 30 °.The slope slope angle at described strip projected parts 4 two ends is 45 °.

This insulated feeder adopts following method to make:

30 kilograms of the paper slags that waste paper is broken into, 40 kilograms of mineral wools, 40 kilograms of cornstarch and be that the rough silica flour of 600～900 purposes or quartzy building stones adopt water law production and 600～700 kilograms in the quartzy waste material powder that is left through 600 eye mesh screens screening back with fineness are prepared burden according to aforementioned proportion.In agitator, add suitable quantity of water, add paper slag, mineral wool, back adding cornstarch and silica flour stir, stir and make slurry, by the wet rising head of mould vacuum filtering shape process, the rising head that will wet is placed on and sends into baking drying in the tunnel type drying oven, 150～200 ℃ of baking temperatures on the drying cart,, got final product after drying is come out of the stove at 5～12 hours according to the different baking temperatures of rising head product wall thickness.

Claims

1. a waist-shaped insulated feeder comprises sidewall (3) and roof (1), and roof (1) is provided with venthole (2), it is characterized in that, described roof (1) is formed with the strip projected parts (4) of downward protrusion in the both sides of venthole (2).

2. a kind of waist-shaped insulated feeder according to claim 1 is characterized in that, the both sides of described strip projected parts (4) form slope and roof (1) rounding off, and the two ends of described strip projected parts (4) form slope and roof (1) rounding off.

3. a kind of waist-shaped insulated feeder according to claim 2 is characterized in that, the slope slope angle of described strip projected parts (4) both sides is 25 °～45 °.

4. a kind of waist-shaped insulated feeder according to claim 3 is characterized in that, the slope angle on the slope of described strip projected parts (4) both sides is 30 °.

5. a kind of waist-shaped insulated feeder according to claim 2 is characterized in that, the slope slope angle at described strip projected parts (4) two ends is 30 °～60 °.

6. a kind of waist-shaped insulated feeder according to claim 5 is characterized in that, the slope slope angle at described strip projected parts (4) two ends is 45 °.

7. according to each described a kind of waist-shaped insulated feeder in the claim 1 to 6, it is characterized in that by weight percentage, component is as follows: silica flour 84%～87%, paper slag 3.5%～4.5%, mineral wool 4.5%～6%, starch 4.5%～6%.

8. a kind of waist-shaped insulated feeder according to claim 7 is characterized in that, described silica flour is that fineness is the rough silica flours of 600～900 purposes.

9. a kind of waist-shaped insulated feeder according to claim 7 is characterized in that, described silica flour is that quartzy building stones adopt water law production and remaining quartzy waste material powder after the screening of 600 eye mesh screens.

10. a kind of waist-shaped insulated feeder according to claim 7 is characterized in that, described starch is cornstarch.