CN201405042Y

CN201405042Y - Cylindrical insulating riser

Info

Publication number: CN201405042Y
Application number: CN2009201202768U
Authority: CN
Inventors: 谢锦荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-18
Filing date: 2009-05-18
Publication date: 2010-02-17
Anticipated expiration: 2019-05-18

Abstract

The utility model discloses a cylindrical insulating riser. The cylindrical insulating riser comprises a side wall and a top wall; an air outlet is formed on the top wall; and ring-shaped projection projecting downward is formed on the periphery of the air outlet of the top wall. The technical scheme is that the periphery of the air outlet of the insulating riser adopts a thickened structure, thereby not only increasing the local flexural strength of the periphery of the air outlet, but also improving the feeding efficiency of the insulating riser.

Description

A kind of cylindrical insulated feeder

Technical field

The utility model belongs to casting field, particularly relates to a kind of cylindrical dark insulated feeder of using in casting technique.

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.

Cylindrical 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 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, thus exist the venthole position easily cracking come off and influence the problem of casting quality, if the thicker rising head of employing wall thickness waste material again.

Summary of the invention

In order to solve above-mentioned technical problem, the purpose of this utility model provides a kind of cylindrical insulated feeder, adopts structure thicker around venthole, thereby improves the local rupture strength around the venthole.

To achieve the above object, the utility model has adopted following technical scheme:

A kind of cylindrical insulated feeder comprises sidewall and roof, and roof is provided with venthole, and described roof is formed with the annular protrusion of downward protrusion around venthole.

Annular protrusion is set has improved venthole local rupture strength on every side, make insulated feeder the problem that ftractures or come off around the venthole in use can not occur, and because annular protrusion is to protrude downwards, make that the position of venthole no longer is the extreme higher position of rising head roof, the extreme higher position of rising head roof is at the contact root of annular protrusion with the rising head roof, gas in the die cavity can be subjected to obstruction to a certain degree in discharge process like this, 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, above-mentioned annular protrusion ringwise ramped shaped and with the roof rounding off.Can suitably reduce the obstruction that annular protrusion is discharged gas like this, avoid it, influence casting quality because of being subjected to impact than ftractureing greatly and coming off.The slope angle of the annular ramp of above-mentioned annular protrusion is 25 °～40 °, is improving feeding efficiency and is avoiding between the annular protrusion cracking balance preferably being arranged like this.

As preferably, the slope angle of the annular ramp of above-mentioned annular protrusion is 30 °.

The utility model adopts structure thicker owing to adopted above technical scheme around the venthole of insulated feeder, not only improved venthole local rupture strength on every side, and has improved the feeding efficiency of insulated feeder.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the A-A cutaway view of Fig. 1.

Fig. 3 is the vertical view of Fig. 1.

Fig. 4 is the rearview of Fig. 1.

The specific embodiment

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

Embodiment 1:

As Fig. 1～a kind of cylindrical insulated feeder shown in Figure 4, comprise sidewall 1 and roof 3, roof 3 is provided with venthole 2, and described roof 3 is formed with the annular protrusion 4 of downward protrusion around venthole 2.Described annular protrusion 4 ringwise ramped shaped and with roof 3 rounding ofves; The slope angle of the annular ramp of described annular protrusion 4 is 30 °.

Claims

1. a cylindrical insulated feeder comprises sidewall (1) and roof (3), and roof (3) is provided with venthole (2), it is characterized in that, described roof (3) is formed with the annular protrusion (4) of downward protrusion around venthole (2).

2. a kind of cylindrical insulated feeder according to claim 1 is characterized in that, described annular protrusion (4) ringwise ramped shaped and with roof (3) rounding off.

3. a kind of cylindrical insulated feeder according to claim 2 is characterized in that, the slope angle of the annular ramp of described annular protrusion (4) is 25 °～40 °.

4. a kind of cylindrical insulated feeder according to claim 2 is characterized in that, the slope angle of the annular ramp of described annular protrusion (4) is 30 °.