CN216397910U

CN216397910U - Wet sand mould

Info

Publication number: CN216397910U
Application number: CN202122328369.3U
Authority: CN
Inventors: 吴志强; 梁伟兴
Original assignee: Guangdong Fuhua Casting Co ltd
Current assignee: Guangdong Fuhua Casting Co ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-04-29
Anticipated expiration: 2031-09-24

Abstract

The utility model discloses a green sand mould, which is used for forming green sand into a sand mould and comprises the following components: the upper die is provided with an upper parting surface, a sprue riser connected with the upper cross runner and an upper die core, and the upper cross runner of the main section cross runner for molding the sand mold is formed on the upper parting surface of the upper die; the lower die is provided with a lower parting surface and a lower riser nest formed on the lower parting surface, a lower die core and two lower cross runners respectively corresponding to two ends of the upper cross runner, each lower cross runner and the outer side wall corresponding to the upper cross runner protrude and extend a lower cross lap joint runner for forming the subsection cross runner of the sand mold, when the upper die and the lower die are aligned, in the projection direction, the projections of the two lower cross lap joint runners are respectively intersected with the projections at two ends of the upper cross runner, so that the upper die and the lower die of the sand mold are assembled, the main section cross runner and the subsection cross runner are overlapped to form the cross runner of the sand mold, sand and slag can be prevented from entering a cavity of the sand mold, and the purpose of reducing the defects of sand holes and slag holes of castings is achieved.

Description

Wet sand mould

Technical Field

The utility model relates to the technical field of casting processing, in particular to a green sand mold.

Background

A green sand mould for making the sand mould of casting is composed of upper and lower moulds, which are respectively arranged in a sand box, upper and lower moulds, and a sprue between said upper and lower moulds, at the moment, the molten metal flows into the sand mold cavity from the sprue through the cross gate, fills the sand mold cavity, and is cooled and molded into a casting after the filling, however, the casting cast by the sand mold has the defects of sand holes and slag holes, which causes the quality reduction of the casting.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide a green sand mould which can reduce the defects of sand holes and air holes of a casting.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the wet sand mould for be the sand mould with the wet sand shaping, include:

the upper die is used for forming the upper die of the sand mold and is provided with an upper parting surface, an upper cross runner of a main section cross runner for forming the sand mold, a straight runner connected with the upper cross runner and upper risers respectively positioned outside two ends of the upper cross runner are formed on the upper parting surface of the upper die, and the outer side wall of each upper riser is connected with an upper die core;

the lower die is used for forming the lower die of the sand mold and is provided with a lower parting surface, a lower riser socket, a lower die core and two lower cross runners are formed at the two ends of the lower parting surface corresponding to the upper riser, the upper die core and the upper cross runner respectively, each lower cross runner is connected with the lower riser socket corresponding to the lower cross runner and the lower die core and convexly provided with a lower cross lap joint runner for forming the subsection cross runner of the sand mold, and when the upper die and the lower die are aligned, the projections of the two lower cross lap joint runners are intersected with the projections of the two ends of the upper cross runner respectively in the projection direction.

Furthermore, two ends of the upper cross runner are respectively a first overlapping end and a second overlapping end, the two lower cross overlapping runners are respectively a first lower cross overlapping runner and a second lower cross overlapping runner, when viewed in a direction perpendicular to the lower parting surface, the projection intersection area of the first lower cross overlapping runner and the corresponding first overlapping end is S1, the projection intersection area of the second lower cross overlapping runner and the corresponding second overlapping end is S2, and the cross-sectional area of the sprue is S3, wherein S1+ S2< S3.

Further, S3 is: 3500mm²～5000mm²，S1+S2＝(0.65～0.95)S3。

Further, the sprue is connected to the middle of the upper runner and perpendicular to the upper runner, the cross-sectional area of the sprue is S3, the portions of the upper runner close to the two opposite sides of the sprue are respectively a first sprue portion and a second sprue portion, and the sum of the cross-sectional areas of the first sprue portion and the second sprue portion is S4, where S3 is: 3500mm²～5000mm²，S4＝(1～1.5)S3。

Furthermore, a plurality of exhaust fins extending along the width direction of the upper cross runner are formed on the upper parting surface of the upper die, two rows of upper die cores are respectively connected to two opposite sides of each upper riser along the length direction of the upper cross runner, and one side, far away from the upper risers, of each upper die core in the same row is connected with one exhaust fin.

Furthermore, the upper die is formed with an exhaust rod on the upper parting surface, each exhaust sheet is connected with one exhaust rod, and the exhaust rods are located between two ends of the exhaust sheet.

Furthermore, two ends of the exhaust sheet extend to the two upper die cores positioned at the head and the tail of the row in the upper die cores in the same row along the width direction of the upper cross runner respectively, and an exhaust rod connected with the exhaust sheet and positioned in the middle of the exhaust sheet is formed on the upper parting surface of the upper die.

Furthermore, a plurality of the upper die cores are arranged in a plurality of rows and a plurality of columns, the upper cross runner is perpendicular to the lower cross runner, a plurality of the upper die cores are arranged in a plurality of rows and a plurality of columns along the two opposite sides of the upper cross runner in the width direction, and a plurality of the lower die cores are arranged on the lower cross runner corresponding to the upper die cores along the two opposite sides of the lower cross runner in the length direction.

Furthermore, a chilling block core is convexly extended on the top surface of the lower die core, the chilling block core is used for forming a chilling block groove of the sand mold, a side chilling block core positioned below the chilling block core is convexly extended on one side wall of the lower die core, which is close to the chilling block core, and the side chilling block core is used for forming a side chilling block groove of the sand mold.

The upper die of the wet sand die of the utility model forms an upper cross runner of a main section cross runner for molding a sand die on the upper parting surface, and the outer side wall of the lower cross pouring channel corresponding to the upper cross pouring channel is convexly provided with a lower cross lapping pouring channel for molding the subsection cross pouring channel of the sand mold, when the upper mold is aligned with the lower mold, in the projection direction, the projections of the two lower horizontal overlapped runners are respectively intersected with the projections of the two ends of the upper horizontal runner, so that when the upper die and the lower die of the sand mold are assembled, the main section cross gate and the subsection cross gate are lapped to form a cross gate of the sand mold, namely, the main section cross pouring gate is lapped above the subsection cross pouring gate so that the main section cross pouring gate and the subsection cross pouring gate are communicated to form a sand mould, by arranging the cross gate, the sand and the slag in the cross gate of the main section have enough time to float to the top surface of the cross gate of the main section, thereby avoiding sand and slag from entering the cavity of the sand mold and achieving the purpose of reducing the defects of casting sand holes and slag holes.

Drawings

Fig. 1 is a schematic three-dimensional exploded view of a green sand mold of the present invention:

FIG. 2 is a perspective view of the upper mold of FIG. 1 from another perspective;

FIG. 3 is a front view of the upper and lower dies of FIG. 1 in alignment;

FIG. 4 is a schematic exploded perspective view of a sand mold of the present invention;

fig. 5 is a state diagram of fig. 4 in use.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1 to 5, the green sand mold of the present invention is used for molding green sand into a sand mold 3 of a casting, wherein the sand mold 3 is used for molding an outer surface shape of the casting and a shape of a partial structure inside the casting, the casting is a corner fitting (not shown) of a container, the green sand mold comprises an upper mold 1 and a lower mold 2, the upper mold 31 and the lower mold 32 of the sand mold 3 are closed to form a plurality of cavities 35 (shown in fig. 3) for molding the casting, and the cavities 35 are used for filling a molten metal for molding the casting, and in this embodiment, the molten metal is molten steel.

As shown in fig. 1 and 4, the upper mold 1 is an upper mold 31 for molding a sand mold 3, and has an upper parting surface 11, the upper mold has an upper runner 12 for molding a main section runner 33 of the sand mold 3, a sprue 17 connected to the upper runner 12, and risers 13 respectively located outside two ends of the upper runner 12, the sprue 17 is a sprue (not numbered) for molding the sand mold 3, the risers 13 are used for molding sand mold risers, and the sand mold risers are used for accommodating molten metal to supplement the molten metal to the cavity 35, so as to supplement the casting. The outer side wall of each upper riser 13 is connected with an upper mold core 14, specifically, two rows of upper mold cores 14 are respectively connected to two opposite sides of each upper riser 13 along the length direction of the upper runner 12, namely, one upper riser 13 can supplement metal liquid for the plurality of cavities 35, and the arrangement of the plurality of upper risers 13 and the plurality of upper mold cores 14 realizes the feeding of a plurality of castings and can save space. The upper die is provided with a plurality of exhaust fins 15 (shown in fig. 1 and 2) extending along the width direction of the upper cross runner 12 on the upper parting surface 11, the exhaust fins 15 are used for forming exhaust grooves (not numbered) of the sand mold 3, the exhaust grooves are used for exhausting gas in the die cavity 35, in order to achieve a good exhaust effect, one side of each upper die core 14 in the same row, which is far away from the upper riser 13, is connected with one exhaust fin 15, two ends of the exhaust fins 15 respectively extend to the two upper die cores 14 in the upper die core 14 in the same row, which are located at the head and the tail of the row, along the width direction of the upper cross runner 12, the volume of the exhaust grooves can be increased by arranging the exhaust fins 15, so that the gas in the plurality of die cavities 35 is concentrated and exhausted outside after being gathered, thereby enhancing the exhaust effect and preventing the casting from generating air holes. The upper die 1 is further provided with an exhaust rod 16 on the upper parting surface 11, the exhaust rod 16 is used for forming an exhaust channel 36 of the sand mold 3, each exhaust sheet 15 is connected with one exhaust rod 16, and the exhaust rods 16 are located between two ends of each exhaust sheet 15, specifically, the upper die 1 is provided with the exhaust rod 16 which is connected with the exhaust sheet 15 and located in the middle of each exhaust sheet 15 on the upper parting surface 11, and each exhaust channel 36 is enabled to exhaust independently by arranging the exhaust rods 16, so that the exhaust effect is further enhanced. In order to improve the production efficiency and save the space of the wet sand mold, the upper mold cores 14 are arranged in multiple rows and multiple columns, specifically, the upper cross runner 12 is respectively provided with the upper mold cores 14 arranged in multiple rows and multiple columns along the two opposite sides of the width direction, in this embodiment, the upper mold cores 14 have four rows and four columns.

In the present embodiment, the height of the exhaust sheet 15 is preferably selected from the following ranges: h3 is more than or equal to 0.6mm and less than or equal to 1.4mm, the range is set so that the exhaust groove only allows gas to pass through and the metal liquid is blocked outside the exhaust groove, that is, the exhaust groove has good exhaust effect and can block the metal liquid from passing through, and particularly, the height of the exhaust sheet 15 is 0.98mm, which is selected to have better effect of blocking the metal liquid and good exhaust effect, in order to further ensure no flash on the casting, in the case of ensuring that the exhaust groove can exhaust, it is a matter of course that the smaller the height of the exhaust fin 15, the more the metal liquid can be blocked from passing through, and therefore, the minimum height of the exhaust fin 15 can be selected to be 0.6mm, in other embodiments, and taking into account form and position tolerances, of course, the height of the vent flap 15 may be 1.4mm, the purpose of blocking the metal liquid can be achieved under the condition of good exhaust effect, and therefore, the specific size of the exhaust sheet 15 in the allowable numerical range can be selected according to actual requirements.

As shown in fig. 1 and 4, the lower mold 2 is used for forming a lower mold 32 of the sand mold 3, and has a lower parting surface 21, the lower mold forms a lower riser 22, a lower mold core 23 and two lower runners 24 on the lower parting surface 21 corresponding to two ends of the upper riser 13, the upper mold core 14 and the upper runner 12, respectively, each lower runner 24 is connected to the corresponding lower riser 22 and the lower mold core 23, and a lower cross runner 241 for forming a subsection runner 34 of the sand mold 3 protrudes from an outer side wall corresponding to the upper runner 12, the lower runner 24 is perpendicular to the upper runner 12, and two opposite sides of the lower runner 24 along the length direction thereof are respectively provided with a plurality of lower mold cores 23 corresponding to the plurality of upper mold cores 14, that is, the plurality of lower mold cores 23 also have four rows and four columns. When the upper die 1 and the lower die 2 are aligned, the upper parting surface 11 is aligned with the lower parting surface 12 in a face-to-face manner, a direction perpendicular to the lower parting surface 21 or the upper parting surface 11 is defined as a projection direction, in the projection direction, the projections of the two lower cross runners 241 intersect with the projections of the two ends of the upper cross runner 12 respectively (as shown in fig. 3), so that when the upper mold 31 and the lower mold 32 of the sand mold 3 are closed, the main section runners 33 overlap the segment runners 34 to form the runners 30 of the sand mold 3 (as shown in figure 5), that is, the main section runners 33 overlap the section runners 34 to connect the runners 30 forming the sand molds 3, by arranging the cross runners 30, the sand and the slag in the main section cross runners 33 have enough time to float up to the top surfaces of the main section cross runners 33, so that the sand and the slag are condensed on the top surfaces of the main section cross runners 33, thereby avoiding sand and slag from entering the cavity 35 and achieving the purpose of reducing the defects of sand holes and slag holes of the casting.

As shown in fig. 1 and 3, in order to further ensure that the sand and slag in the main section runner 33 float up to the top surface of the main section runner 33 for a sufficient time, specifically, the two ends of the upper runner 12 are respectively the first overlapping end 121 and the second overlapping end 121The second overlapping end 122 and the two lower horizontal runners 241 are respectively a first lower horizontal runner 2411 and a second lower horizontal runner 2412, when viewed from a direction perpendicular to the lower parting plane 21, the projection intersection area of the first lower horizontal runner 2411 and the corresponding first overlapping end 121 is S1, the projection intersection area of the second lower horizontal runner 2412 and the corresponding second overlapping end 122 is S2, and the cross-sectional area of the sprue 17 is S3, wherein S1+ S2<And S3. Since different castings have different requirements on the quality of the castings, the specific sizes of the castings S1, S2 and S3 can be flexibly selected according to actual requirements under the condition of ensuring the smooth flow of the molten metal in the runner 30, and in the embodiment, the casting size S3 is as follows: 3500mm²～5000mm²S1+ S2 is (0.65-0.95) S3, more specifically, the sprue 17 is connected to the middle of the upper runner 12 and perpendicular to the upper runner 12, the portions of the upper runner 12 close to the two opposite sides of the sprue 17 are the first upper runner portion 123 and the second upper runner portion 124, respectively, and the sum of the cross-sectional areas of the first upper runner portion 123 and the second upper runner portion 124 is S4, where S4 is selected as: (1-1.5) S3. Proved by verification, through the design of the S1, the S2, the S3 and the S4, under the condition that the metal liquid smoothly flows in the cross gate 30, the defects of sand holes and slag holes of the castings can be further reduced, and the quality of the castings is improved.

More specifically, a chill core 25 protrudes from the top surface of the lower mold core 23, the chill core 25 is used to form a chill tub of the sand mold 3, a side chill core 26 positioned below the chill core 25 protrudes from a side wall of the lower mold core 23 adjacent to the chill core 25, and the side chill core 26 is used to form a side chill tub (not numbered) of the sand mold 3. The chill tank (not numbered) and the side chill tank (not numbered) are respectively located at the positions of different hot junctions of the casting corresponding to the sand mold 3, both are used for placing chills (not shown), and the two chills are respectively used for cooling the hot junctions of the casting corresponding to the chills.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.

Claims

1. The wet sand mould for be the sand mould with the wet sand shaping, its characterized in that includes:

2. The green sand mold of claim 1, wherein the upper runner has first and second overlapping ends at opposite ends thereof, and wherein the lower cross runners have first and second lower cross runners, respectively, wherein the first lower cross runner has an area S1 projected to intersect with the corresponding first overlapping end, and the second lower cross runner has an area S2 projected to intersect with the corresponding second overlapping end, and wherein the cross-sectional area of the sprue is S3, wherein S1+ S2< S3, as viewed in a direction perpendicular to the lower parting plane.

3. The green-sand mold of claim 2, wherein S3 is: 3500mm²～5000mm ²，S1+S2＝(0.65～0.95)S3。

4. The green sand mold of claim 1, wherein the sprue is connected to and perpendicular to a middle portion of the head runner, the sprue has a cross-sectional area of S3, portions of the head runner adjacent to opposite sides of the sprue are first and second sprue portions, respectively, and a sum of the cross-sectional areas of the first and second sprue portions is S4, wherein S3 is: 3500mm²～5000mm²，S4＝(1～1.5)S3。

5. The green sand mold of claim 1, wherein the upper mold has a plurality of vent fins formed on the upper parting surface and extending in a width direction of the upper runner, two rows of the upper mold cores are respectively connected to two opposite sides of each upper riser in a length direction of the upper runner, and one vent fin is connected to one side of each upper mold core in the same row away from the upper riser.

6. The damp pattern sand mold according to claim 5, wherein the upper mold is formed with a vent bar on the upper parting surface, one vent bar being connected to each vent plate, and the vent bar being located between both ends of the vent plate.

7. The wet sand mold as claimed in claim 5, wherein both ends of the vent plate extend to the outside of two upper mold cores located at the head and the tail of the same row of the upper mold cores along the width direction of the upper runner, respectively, and the upper mold is formed with a vent bar connected with the vent plate and located at the middle of the vent plate on the upper parting surface.

8. The green sand mold of claim 1, wherein a plurality of the upper mold cores are arranged in a plurality of rows and a plurality of columns, the upper runner is perpendicular to the lower runner, a plurality of the upper mold cores are arranged in a plurality of rows and a plurality of columns in the upper runner along opposite sides of the upper runner in the width direction, and a plurality of the lower mold cores are arranged in a plurality of rows and a plurality of columns in the lower runner along opposite sides of the lower runner in the length direction.

9. The green sand mold of claim 1, wherein a chill core protrudes from the top surface of the lower mold core, the chill core is used for molding a chill trough of the sand mold, a side chill core positioned below the chill core protrudes from a side wall of the lower mold core close to the chill core, and the side chill core is used for molding a side chill trough of the sand mold.