CN112935191A

CN112935191A - Air outlet riser

Info

Publication number: CN112935191A
Application number: CN202110114311.0A
Authority: CN
Inventors: 姚红汝; 宋亮; 纳建虹; 刘天平
Original assignee: Kocel Machinery Co Ltd
Current assignee: Kocel Machinery Co Ltd
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2021-06-11
Anticipated expiration: 2041-01-28
Also published as: CN112935191B

Abstract

The invention relates to a gas outlet riser, in particular to a self-closing gas outlet riser, wherein a sinking groove is arranged above a gas outlet channel, a first cavity is arranged in the gas outlet channel, and a second cavity is arranged below the first cavity; the sinking groove is provided with a through hole for communicating the first cavity with the sinking groove; the floatable sand core is arranged in the first cavity, and a gap is formed between the floatable sand core and the first cavity; the diameter of the sinking groove is larger than the diameter of the through hole, and the maximum diameter of the floatable sand core is larger than the diameter of the through hole; the air outlet riser is positioned at the top of the casting cavity, and the second cavity faces to the top of the casting cavity. The invention overcomes the defects that the casting is easy to clamp sand, clamp slag, not fused and the like due to the flying of foreign matters in the use of the riser vent and the serious waste of molten iron, avoids the riser vent from penetrating from the sand box opening to the cavity, prevents the foreign matters from entering the cavity, reduces the defect risk of the casting and saves the molten iron.

Description

Air outlet riser

Technical Field

The invention relates to a gas outlet riser, in particular to a self-closing gas outlet riser structure which is suitable for a casting production process.

Background

In the casting process design, the design of the air outlet riser is crucial, and the gas in the cavity can be smoothly discharged through the reasonable design of the air outlet riser, so that the casting defects of the cavity, such as air blocking, air entrainment, air holes and the like, are prevented. In general, the air outlet riser is of a cuboid shell-shaped structure which is vertical to the bottom surface and penetrates through the bottom, the air outlet channel is filled with molten iron in the pouring process, loose sand and foreign matters are easy to enter the cavity, and splashed iron beans are easy to fly into the air outlet channel in the pouring process; and an adhesive tape or a cover plate is needed to shield the air outlet on the top surface.

A utility model patent, grant no: CN207057574U entitled "sand mould air outlet riser structure preventing sand feeding" describes that an air outlet structure is provided with an air outlet riser, the air outlet riser is provided with an air outlet channel penetrating through the bottom, the air outlet channel penetrates through the air outlet riser from one side surface of the air outlet riser so as to form an air outlet, and thus the air outlet channel with the inlet and the outlet not on the same straight line is formed. The disadvantages of this solution are: the air inlet and the air outlet are not on the same straight line, and the sand eating amount at the transverse and longitudinal positions near the air outlet channel needs to be considered during design, so that the sand-iron ratio is increased; foreign matters are easy to fly into; the air outlet channel is too long, and much molten iron is wasted.

Disclosure of Invention

The invention overcomes the casting defects that foreign matters are easy to fly into the casting, so that the casting is easy to have sand inclusion, slag inclusion, non-fusion and the like in the use process of the riser; and the problem that the cavity is required to be filled with molten iron when the air outlet riser is used in the prior art, and the molten iron is seriously wasted is solved.

The air outlet riser is characterized by comprising an air outlet channel and a floatable sand core, wherein a sink groove is arranged above the air outlet channel, a first cavity is arranged in the air outlet channel, and a second cavity is arranged below the first cavity; the sinking groove is provided with a through hole for communicating the first cavity with the sinking groove; the floatable sand core is arranged in the first cavity, and a gap is formed between the floatable sand core and the first cavity; the diameter of the sinking groove is larger than the diameter of the through hole, and the maximum diameter of the floatable sand core is larger than the diameter of the through hole; the air outlet riser is positioned at the top of the casting cavity, and the second cavity faces to the top of the casting cavity.

Optionally, the air outlet channel includes an upper air outlet channel and a lower air outlet channel, and a snap fastener is arranged between the upper air outlet channel and the lower air outlet channel, so as to connect the upper air outlet channel and the lower air outlet channel together. The sink groove is arranged on the upper air outlet channel, namely the upper end of the upper air outlet channel; the second cavity is arranged on the lower air outlet channel, namely the lower end of the lower air outlet channel; the first cavity is arranged between the upper air outlet channel and the lower air outlet channel. The upper air outlet channel is close to the lower air outlet channel, namely a male buckle or a female buckle is arranged at the lower end of the upper air outlet channel, the lower air outlet channel is close to the upper air outlet channel, namely the upper end of the lower air outlet channel is correspondingly provided with the female buckle or the male buckle.

Optionally, the sinking groove and the first cavity are coaxially arranged, the floatable sand core may be an integral sand core composed of a first sand core and a second sand core, the diameter of the first sand core is smaller than that of the second sand core, the first sand core is close to the sinking groove, and the second sand core is close to the second cavity. Preferably, the diameter of the second sand core towards one end of the through hole is gradually reduced and the second sand core is connected with the first sand core. The diameter of the sinking groove is larger than that of the first sand core, and the diameter of the through hole is smaller than that of the second sand core. The diameter of the second cavity is smaller than the diameter of the bottom surface of the second sand core.

Optionally, the shape of the first cavity is the same as that of the floatable sand core, but the structural size of the first cavity is larger than that of the floatable sand core, a certain gap is formed between the first cavity and the floatable sand core, and the floatable sand core can move in the first cavity.

Optionally, the shape of the second cavity projected to the top of the casting cavity is rectangular, and preferably, the shape of the second cavity projected to the top of the casting cavity is rectangular.

Optionally, the contact area between the casting and the lower gas outlet channel, that is, the size of the second cavity, may be determined according to a simulation result of simulation software.

A manufacturing method of the air vent riser comprises the following steps: preparing an air outlet channel and a floatable sand core in advance, placing the floatable sand core on the lower air outlet channel, assembling the upper air outlet channel on the lower air outlet channel, and placing the installed air outlet channel at the positioning position of the casting air outlet channel.

The invention provides an air outlet riser, which simplifies the design of an air outlet channel and prevents foreign matters from directly entering a cavity. When the distance of the floatable sand core in the vertical direction is increased, the exhaust function of the air outlet channel in the whole mold filling process can be ensured. The invention avoids the air outlet riser from penetrating from the sand box opening to the cavity, and prevents foreign matters from entering the cavity, thereby reducing the defect risk of castings, saving molten iron and improving the process yield. Meanwhile, the contact part of the gas outlet channel and the casting is of a cuboid contact structure, so that the contact thermal node of the casting in the solidification process when the gas outlet channel is full of molten iron can be reduced, and the casting defects of shrinkage porosity, graphite floating and the like are avoided; the riser outlet has low cost, safe process and straight riser

The method is simple and stable and has strong practicability.

Drawings

FIG. 1 is a schematic longitudinal section of a floatable sand core;

FIG. 2 is a schematic longitudinal sectional view of the gas outlet channel;

FIG. 3 is a schematic view of a strain relief;

the sand core comprises a floatable sand core-100, a first sand core-110, a second sand core-120, an upper air outlet channel-221, a lower air outlet channel-222, snap fasteners-223, sink slots-210, through holes-211, a first cavity-230 and a second cavity-240.

Detailed Description

In order to more clearly illustrate the technical solution of the present invention, the present invention is further described in detail with reference to the following specific examples. Note that the following described embodiments are illustrative only for explaining the present invention, and are not to be construed as limiting the present invention.

The invention relates to an air outlet riser, which comprises an air outlet channel and a floatable sand core, wherein the air outlet channel is a cylindrical riser main body.

Referring to fig. 1, a floatable core 100 according to an embodiment of the present invention is a unitary core that may be structurally divided into two parts, a first core 110 and a second core 120. The upper structure of the floatable sand core 100 is a first sand core 110, the first sand core 110 is a small cylinder, the lower structure is a second sand core 120, the second sand core 120 is a cylinder with an inverted cone structure, the cylinder of the second sand core 120 forms a certain gradient, and the inverted cone structure with the gradient can ensure that the floatable sand core 100 is better matched with the gas outlet channel when floated by molten iron buoyancy.

Referring to fig. 2, the main body of the air outlet channel is a cylinder, and the middle part of the air outlet channel is divided along the horizontal center line to divide the air outlet channel into an upper air outlet channel 221 and a lower air outlet channel 222. In order to connect the upper outlet channel 221 and the lower outlet channel 222 together, snap fasteners 223 are provided on the upper and

lower outlet channels

221 and 222. Because the two sides of the upper air outlet channel 221 and the lower air outlet channel 222 are solid structures, and the middle is a hollow structure, the snap fastener 223 is arranged at the position where the solid structures at the two sides of the upper air outlet channel 221 and the lower air outlet channel 222 are contacted. And snap fastener 223 is set up at upper portion gas off-take 221 and lower part gas off-take 222 symmetric position, and the upper portion gas off-take 221 left and right sides symmetry is provided with the same sub-and is buckled, and the corresponding lower part gas off-take 222 left and right sides position symmetry is provided with the box, and this structural arrangement is convenient for but the equipment of unsteady psammitolite to the gas off-take, also does benefit to the combination of upper portion gas off-take and lower part gas off-take simultaneously, avoids producing the dislocation.

The two cavities are arranged in the air outlet channel, the second cavity 240 is arranged at the lower part of the lower air outlet channel 222, the first cavity 230 is arranged above the second cavity 240, the first cavity 230 is arranged between the upper air outlet channel 221 and the lower air outlet channel 222, the sinking groove 210 is arranged above the upper air outlet channel 221, and the sinking groove 210 is communicated with the first cavity, so that the through hole 211 is formed in the sinking groove 210. The sink groove 210, the first cavity 230, and the second cavity 240 are disposed along the same axis, and are disposed from top to bottom respectively from the air outlet channel main body.

The diameter of the sinking groove 210 is 10-20mm larger than that of the first sand core 110 on the floatable sand core 100, in the embodiment, the diameter of the sinking groove 210 is slightly larger than that of the second sand core 120, the depth of the sinking groove 210 is 10mm, and the sinking groove 210 can effectively prevent sundries from directly entering the air passage.

Referring to fig. 3, the shape of the first cavity 230 is consistent with the shape of the floatable sand core 100, and the structural size of the first cavity 230 is 5-10 mm larger than the size of the floatable sand core 100, so that the floatable sand core can float in the first cavity 230 at a later stage and provide an exhaust condition. In this embodiment, the diameter of the through hole 211 formed in the sinking groove 210 is equal to the diameter of the first sand core 110, and the diameter of the through hole 211 is smaller than the diameter of the second sand core 120, so that the floatable sand core 100 is prevented from floating outside the air outlet channel while the floatable sand core 110 floats on the air outlet channel.

The second cavity 240 in this embodiment is a rectangular parallelepiped structure, the shape projected to the sand mold of the casting is a rectangle, and the length of the projected rectangle is 10-20mm smaller than the length of the second sand core 120 on the lower portion of the floatable sand core 100.

Because the gas outlet channel is arranged at the top of the casting cavity, the lower end of the gas outlet channel is in contact with the casting, and the structure of the second cavity 240 which is a cuboid can enable the gas outlet riser to be rectangular in contact with the casting, so that the contact thermal node of the gas outlet channel to the casting is reduced, and the defects of shrinkage porosity, graphite floating and the like are avoided.

According to the air outlet riser provided by the invention, the air passage is blocked by the floatable sand core 100 under the action of gravity in the earlier stage, when molten iron in the cavity is gradually filled in the cavity, the air outlet passage exhausts smoothly in the earlier stage, the air pressure in the cavity rises continuously, and the floatable sand core floats upwards continuously, and the floatable sand core 100 is a long cylinder, so that the distance of the floatable sand core in the vertical direction is ensured, and the air outlet passage can play a role in exhausting in the process of filling the cavity. Along with the sand core that can float constantly come up, first sand core 110 rises and gets into to through-hole 211, and the gas outlet channel is blockked up, and the gas outlet channel is closed, prevents scattered sand and foreign matter and gets into the die cavity, practices thrift the molten iron simultaneously.

The floatable sand core 100 is placed in the lower gas outlet channel 222 according to a matched shape, the upper gas outlet channel 221 is assembled to form a complete gas outlet riser structure, and when the floatable sand core is used, the floatable sand core is placed at the gas outlet channel positioning position at the top of a casting cavity.

Although embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, that various changes, modifications, substitutions and alterations may be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An air outlet riser is characterized by comprising an air outlet channel and a floatable sand core,

a sink groove is arranged above the gas outlet channel, a first cavity is arranged in the gas outlet channel, and a second cavity is arranged below the first cavity;

the sinking groove is provided with a through hole for communicating the first cavity with the sinking groove;

the floatable sand core is arranged in the first cavity, and a gap is formed between the floatable sand core and the first cavity;

the diameter of the sinking groove is larger than the diameter of the through hole, and the maximum diameter of the floatable sand core is larger than the diameter of the through hole;

the air outlet riser is positioned at the top of the casting cavity, and the second cavity faces to the top of the casting cavity.

2. The strain relief of claim 1, wherein the first cavity has a shape that corresponds to a shape of the floatable core.

3. The strain relief of claim 1, wherein the floatable core tapers in diameter towards one end of the through hole.

4. The strain relief of claim 1, wherein the second cavity is rectangular in shape projected onto the top of the casting cavity.

5. The strain relief as claimed in claim 1, wherein the gas outlet channel comprises an upper gas outlet channel and a lower gas outlet channel which are communicated with each other, the upper gas outlet channel is provided with the sinking groove, the lower gas outlet channel is provided with the second cavity, and the first cavity is arranged between the upper gas outlet channel and the lower gas outlet channel.

6. The strain relief as claimed in claim 5, wherein the upper vent passage and the lower vent passage are connected by snap fasteners.

7. The strain relief of claim 1, wherein the diameter of the second cavity is less than the diameter of the bottom surface of the floatable core.