CN213033577U - Core box convenient to advance exhaust - Google Patents
Core box convenient to advance exhaust Download PDFInfo
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- CN213033577U CN213033577U CN202021789121.6U CN202021789121U CN213033577U CN 213033577 U CN213033577 U CN 213033577U CN 202021789121 U CN202021789121 U CN 202021789121U CN 213033577 U CN213033577 U CN 213033577U
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Abstract
The utility model relates to a core box convenient to advance exhaust relates to the technical field of nodular cast-iron pipe core making, it includes base, lower mould, external mold, mandrel and last mould, lower mould fixed connection is on the base, the mandrel is coaxial to be set up in the external mold, and the bottom face and the lower mould top face butt of mandrel, it establishes on the external mold to go up the mould lid, lower mould, external mold, form the die cavity between mandrel and the last mould, the last sand blasting hole of having seted up of going up the mould, set up the exhaust hole that has a bottom on the lower mould, the exhaust hole that has a bottom is covered by the mandrel, the last exhaust hole that has seted up of. The air in the cavity can enter the bottom vent hole from the gap between the core mold and the bottom mold and then be discharged to the atmosphere, and meanwhile, the air in the cavity can be directly discharged to the atmosphere from the top vent hole, so that the cavity is conveniently filled with core sand, and the probability of the defect of the core sand core is reduced; meanwhile, air between the core sands is easier to overflow from the cavity, air holes in the sand core are reduced, and the strength of the sand core is improved.
Description
Technical Field
The application relates to the technical field of core making of ductile iron pipes, in particular to a core box convenient for air intake and exhaust.
Background
In order to form the internal shape of the female end of the nodular cast iron pipe, a sand core needs to be placed inside the female end of the pipe die, one sand core needs to be consumed when one nodular cast iron pipe is poured, and the female end of the nodular cast iron pipe is formed between the internal cavity of the female end of the pipe die and the outside of the sand core.
The sand core is mostly manufactured through a core making machine and a core box, and a cavity with the same shape as the sand core is arranged in the core box.
SUMMERY OF THE UTILITY MODEL
In order to reduce the quantity of the air holes in the sand core, the core box convenient to intake and exhaust is provided.
The core box convenient to advance to exhaust that this application provided adopts following technical scheme:
a core box convenient for air intake and exhaust comprises a base, a lower die, an outer die, a core die and an upper die, wherein the lower die is fixedly connected to the base, the outer die comprises a first half die and a second half die, the first half die and the second half die are arranged along the axis of the lower die in a centrosymmetric manner, the first half die and the second half die are connected with the base in a sliding manner along the direction perpendicular to the axis of the lower die, the inner circumferential surfaces of the first half die and the second half die are abutted against the outer circumferential surface of the lower die, the core die is coaxially arranged in the outer die, the bottom end surface of the core die is abutted against the top end surface of the lower die, the upper die is covered on the outer die, a cavity is formed among the lower die, the outer die, the core die and the upper die, a sand spraying hole is formed in the upper die, one end of the sand spraying hole is communicated with the cavity, and a, the bottom vent hole is covered by the core mold, a top vent hole is formed in the upper mold, and the top vent hole is communicated with the cavity.
By adopting the technical scheme, when the core sand is injected into the cavity, the core sand enters the cavity from the sand blasting hole, air in the cavity can enter the bottom exhaust hole from a gap between the core mould and the bottom mould and then is exhausted into the atmosphere, and meanwhile, the air can be directly exhausted into the atmosphere from the top exhaust hole, so that the overflow rate of the air in the cavity is improved, the cavity is conveniently filled with the core sand, the probability of the defects of the core sand is reduced, meanwhile, the air between the core sand is easier to overflow from the cavity under the pressure when the core sand is injected, the air holes in the formed core sand core are reduced, the strength of the formed core sand core is improved, the core sand core is difficult to damage and crack when the socket end of the nodular cast iron pipe is cast by using the core sand core, and the precision of the socket end of the nodular cast iron pipe is improved.
The present application may be further configured in a preferred example to: the top exhaust holes and the bottom exhaust holes are uniformly distributed along the axis of the lower die.
By adopting the technical scheme, the overflow speed of air in the cavity in the circumferential direction is more uniform, core sand is convenient to fill the cavity, the probability of the sand core having defects is reduced, air holes in the sand core are distributed more uniformly in the circumferential direction, the strength of each part in the circumferential direction of the sand core is further uniform, and when the sand core is used for casting the socket end of the nodular cast iron pipe, the sand core is not easy to partially collapse.
The present application may be further configured in a preferred example to: a plurality of first ventilation grooves are formed in the top end face of the lower die and correspond to the bottom vent holes one by one, the first ventilation grooves are communicated with the die cavity and the bottom vent holes, and the depth of each first ventilation groove is smaller than the grain size of the core sand.
By adopting the technical scheme, the arrangement of the first ventilation groove improves the air circulation rate between the bottom vent hole and the cavity, so that the exhaust efficiency of the bottom vent hole is improved, the overflow speed of air in the cavity in the axial direction of the cavity is more uniform, the cavity is conveniently filled with core sand, and the probability of the defect of the sand core is reduced; and meanwhile, the air holes in the sand core are distributed more uniformly in the axial direction, so that the strength of all parts of the sand core in the axial direction is more uniform, and the sand core is not easy to partially collapse when the sand core is used for casting the female end of the nodular cast iron pipe.
The present application may be further configured in a preferred example to: the periphery of the lower die is provided with a plurality of second ventilation grooves which are uniformly distributed along the circumferential direction of the lower die, the second ventilation grooves are communicated with the cavity and the atmosphere, and the depth of the second ventilation grooves is smaller than the particle size of the core sand.
By adopting the technical scheme, the arrangement of the second ventilation groove improves the air circulation rate between the bottom of the cavity and the atmosphere, improves the exhaust efficiency of the bottom of the cavity, ensures that the overflow speed of the air in the cavity in the axial direction of the cavity is more uniform, is convenient for filling the cavity with core sand, and reduces the probability of the defect of the sand core; and meanwhile, the air holes in the sand core are distributed more uniformly in the axial direction, so that the strength of all parts of the sand core in the axial direction is more uniform, and the sand core is not easy to partially collapse when the sand core is used for casting the female end of the nodular cast iron pipe.
The present application may be further configured in a preferred example to: and a filtering component for filtering core sand is arranged in the top exhaust hole.
Through adopting above-mentioned technical scheme, when pouring into the core sand into the die cavity, the air in the die cavity can be followed the top and exhausted the hole and discharged, but under filter assembly's filtering action, the core sand can't be followed the hole of exhausting in the top, because the quantity of pouring into the core sand into the die cavity is the ration when the preparation psammitolite, so can make the psammitolite compacter, has reduced the quantity of the gas pocket after the psammitolite shaping, has improved the intensity of the psammitolite after the shaping.
The present application may be further configured in a preferred example to: the filter assembly comprises a support ring and a filter screen, the filter screen is connected to the support ring, the support ring is coaxially clamped in the top exhaust hole, and the aperture of the filter screen is smaller than the particle size of the core sand.
By adopting the technical scheme, when the core sand is injected into the cavity, the air in the cavity can pass through the filter screen and overflow into the atmosphere, but the core sand cannot pass through the filter screen and be discharged into the atmosphere, so that the core sand is saved, meanwhile, the sand core is more compact, the number of air holes formed by the sand core is reduced, and the strength of the formed sand core is improved.
The present application may be further configured in a preferred example to: the support ring with the top exhaust hole is interference fit, just on the outer peripheral face of support ring and keep away from the one end of die cavity has seted up the radius angle.
By adopting the technical scheme, the support ring is in interference fit with the top vent hole, so that the support ring is not easy to fall off from the top vent hole, and the stability of the filter assembly is improved; and the support ring is provided with a fillet, so that the support ring can be conveniently clamped into the top exhaust hole.
The present application may be further configured in a preferred example to: the filter screen sets up the support ring is close to the one end of die cavity, just the filter screen with go up the mould and be close to a terminal surface parallel and level of die cavity.
By adopting the technical scheme, after the core sand is injected into the cavity and the sand core is molded, the protrusion is not easily formed at the top exhaust hole on the end surface of the sand core close to the upper die, so that the molded sand core is not reprocessed, the molding efficiency of the sand core is improved, and the precision of the sand core is improved.
The present application may be further configured in a preferred example to: the filter assembly further comprises a supporting rod, the axis of the supporting rod is perpendicular to the axis of the supporting ring, the supporting rod is clamped on the inner circumferential surface of the supporting ring, and the supporting rod is further abutted to one end face, far away from the cavity, of the filter screen.
Through adopting above-mentioned technical scheme, the die cavity was kept away from to bracing piece and filter screen one end face butt, and when filter screen filter core sand, the bracing piece can play the supporting role to the filter screen for the filter screen is difficult for droing from the support ring, and the filter screen is difficult for the variant simultaneously, and the psammitolite is difficult for forming the arch in exhaust vent department on being close to a terminal surface of last mould, has improved the shaping efficiency of psammitolite, has improved the precision of psammitolite simultaneously.
In summary, the present application includes at least one of the following beneficial technical effects:
1. through the arrangement of the bottom vent hole and the top vent hole, air in the cavity can enter the bottom vent hole from a gap between the core mold and the bottom mold and then be discharged into the atmosphere, and meanwhile, the air in the cavity can be directly discharged into the atmosphere from the top vent hole, so that the cavity is conveniently filled with core sand, and the probability of the defect of the core sand is reduced; meanwhile, air between the core sands is easier to overflow from the cavity, air holes in the sand core are reduced, and the strength of the sand core is improved.
2. Through the arrangement of the first ventilation groove, the air circulation rate between the bottom vent hole and the cavity is improved, so that the exhaust efficiency of the bottom vent hole is improved, the axial overflow speed of air in the cavity is more uniform, the cavity is conveniently filled with core sand, and the probability of the defect of the sand core is reduced; and meanwhile, the air holes in the sand core are distributed more uniformly in the axial direction, so that the strength of all parts of the sand core in the axial direction is more uniform, and the sand core is not easy to partially collapse when the sand core is used for casting the female end of the nodular cast iron pipe.
3. Through the arrangement of the second ventilation grooves, the air circulation rate between the bottom of the cavity and the atmosphere is improved, the exhaust efficiency of the bottom of the cavity is improved, the overflow speed of the air in the cavity in the axial direction of the air in the cavity is more uniform, the cavity is conveniently filled with core sand, and the probability of the defect of the sand core is reduced; and meanwhile, the air holes in the sand core are distributed more uniformly in the axial direction, so that the strength of all parts of the sand core in the axial direction is more uniform, and the sand core is not easy to partially collapse when the sand core is used for casting the female end of the nodular cast iron pipe.
4. Through filter assembly's setting, when pouring into core sand into the die cavity, the air in the die cavity can be followed and the exhaust hole is discharged, but under filter assembly's filtering action, the core sand can't be followed and exhaust in the exhaust hole of top, because the quantity of pouring into core sand into the die cavity when the preparation psammitolite is the ration, so can make the psammitolite compacter, has reduced the quantity of the gas pocket after the psammitolite shaping, has improved the intensity of the psammitolite after the shaping.
Drawings
FIG. 1 is a schematic overall structure diagram of an embodiment of the present application;
FIG. 2 is a schematic view of the overall structure of the core box of the embodiment of the present application when opened;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic view showing the entire structure of the core mold and the upper mold in the embodiment of the present application;
fig. 5 is a schematic view of the overall structure of the filter assembly in the embodiment of the present application.
Reference numerals: 1. a base; 2. a lower die; 21. a bottom vent; 22. a first gas-permeable groove; 23. a second air-permeable groove; 3. an outer mold; 31. a first mold half; 32. a second mold half; 4. a core mold; 5. an upper die; 51. sand blasting holes; 52. a top vent; 6. a cavity; 7. a filter assembly; 71. a support ring; 72. a filter screen; 73. a support rod.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a core box convenient to advance exhaust. Referring to fig. 1 and 2, the core box facilitating air intake and exhaust comprises a base 1, a lower die 2, an outer die 3, a core die 4 and an upper die 5, wherein the lower die 2 is arranged in a circular ring shape, and the lower die 2 is fixedly connected to the top end surface of the base 1 through a countersunk bolt. The outer die 3 comprises a first half die 31 and a second half die 32, the first half die 31 and the second half die 32 are arranged in central symmetry along the axis of the lower die 2, and the first half die 31 and the second half die 32 are connected with the base 1 in a sliding manner along a direction perpendicular to the axis of the lower die 2; when the first and second mold halves 31, 32 are slid relative to each other until they are in contact with each other, the bottom portions of the inner peripheral surfaces of the first and second mold halves 31, 32 are in contact with the outer peripheral surface of the lower mold 2.
Referring to fig. 1 and 2, the core mold 4 is a circular truncated cone, the core mold 4 is coaxially arranged in the outer mold 3, the core mold 4 is further fixedly connected to an upper mold 5 through a countersunk head bolt, the upper mold 5 is covered on the outer mold 3, and when the upper mold 5 is covered on the outer mold 3, the bottom end surface of the core mold 4 is abutted to the top end surface of the lower mold 2; when the mold is opened, the upper mold 5 and the core mold 4 slide relative to the outer mold 3 along the axial direction of the lower mold 2. A cavity 6 is formed among the lower die 2, the outer die 3, the core die 4 and the upper die 5.
Referring to fig. 2 and 3, the lower mold 2 is provided with a plurality of bottom vent holes 21, the axis of the bottom vent holes 21 is parallel to the axis of the lower mold 2, the bottom vent holes 21 are uniformly provided along the axis of the lower mold 2, and when the bottom end surface of the core mold 4 abuts against the top end surface of the lower mold 2, the bottom vent holes 21 are covered by the core mold 4. A plurality of sand blasting holes 51 and a plurality of top vent holes 52 are formed in the upper die 5, the sand blasting holes 51 and the top vent holes 52 are uniformly distributed along the axis of the lower die 2, and the sand blasting holes 51 and the top vent holes 52 are communicated with the die cavity 6 at one ends close to the die cavity 6.
Referring to fig. 2 and 3, a plurality of first ventilation grooves 22 are formed in the top end face of the lower die 2, the first ventilation grooves 22 correspond to the bottom vent holes 21 one by one, the first ventilation grooves 22 communicate the cavity 6 with the bottom vent holes 21, and the depth of each first ventilation groove 22 is smaller than the particle size of the core sand.
Referring to fig. 2 and 3, the outer circumferential surface of the lower mold 2 is further provided with a plurality of second ventilation grooves 23, the second ventilation grooves 23 are uniformly distributed along the circumferential direction of the lower mold 2, the second ventilation grooves 23 communicate the cavity 6 with the atmosphere, and the depth of the second ventilation grooves 23 is smaller than the particle size of the core sand.
Referring to fig. 2 and 3, through the arrangement of the first ventilation groove 22 and the second ventilation groove 23, the air circulation rate between the atmosphere and the cavity 6 is improved, so that the exhaust efficiency of the bottom exhaust hole 21 is improved, the overflow speed of the air in the cavity 6 in the axial direction of the air is more uniform, the cavity 6 is conveniently filled with core sand, and the probability of the defect of the core sand is reduced; and meanwhile, the air holes in the sand core are distributed more uniformly in the axial direction, so that the strength of all parts of the sand core in the axial direction is more uniform, and the sand core is not easy to partially collapse when the sand core is used for casting the female end of the nodular cast iron pipe.
Referring to fig. 4 and 5, a filter assembly 7 for filtering core sand is disposed in the top exhaust hole 52, and the filter assembly 7 includes a support ring 71, a filter net 72, and a support rod 73. The aperture of the filter screen 72 is smaller than the particle size of the core sand, the filter screen 72 is clamped at one axial end of the support ring 71, and a fillet is formed at one end, far away from the filter screen 72, of the outer peripheral surface of the support ring 71. The support ring 71 is coaxially clamped in the top vent hole 52, and the support ring 71 is in interference fit with the top vent hole 52.
When the support ring 71 is mounted in the top vent hole 52, the end of the support ring 71 provided with the rounded corner is inserted into the top vent hole 52 from the end close to the cavity 6, the filter mesh 72 is arranged at the end of the support ring 71 close to the cavity 6, and the filter mesh 72 is flush with the end face of the upper die 5 close to the cavity 6. The support rod 73 is clamped on the inner wall of the support ring 71, the axis of the support rod 73 is perpendicular to the axis of the support ring 71, the support rod 73 is arranged on one side of the filter screen 72, which is far away from the cavity 6, and the peripheral surface of the support rod 73 is abutted to one end surface of the filter screen 72, which is far away from the cavity 6.
Referring to fig. 2 and 5, the air in the cavity 6 can overflow to the atmosphere through the filter screen 72, but the core sand cannot be discharged to the atmosphere through the filter screen 72, so that the core sand is saved. Because the quantity of the core sand injected into the cavity 6 is quantitative when the sand core is manufactured, the sand core is firmer, the quantity of air holes formed by the sand core is reduced, and the strength of the formed sand core is improved. And because the setting of bracing piece 73, pour into the core sand and make the psammitolite shaping into the die cavity 6, filter screen 72 is difficult to deform, make the surplus material portion of psammitolite difficult to form the arch on keeping away from the terminal surface of work portion, facilitate depositing and transporting of psammitolite. The support rods 73 may be provided in plurality in parallel in order to better support the filter net 72.
The implementation principle of the core box convenient for air intake and exhaust in the embodiment is as follows:
after the lower die 2, the outer die 3, the core die 4 and the upper die 5 are closed to form the cavity 6, core sand is sprayed into the cavity 6 through the sand spraying holes 51, and at the moment, air in the cavity 6 overflows out of the cavity 6 from the bottom exhaust hole 21, the second ventilation groove 23 and the top exhaust hole 52 respectively, so that air among the core sand is easier to overflow out of the cavity 6, and air holes in the sand core are reduced; because the depths of the first ventilation groove 22 and the second ventilation groove 23 are both smaller than the grain diameter of the core sand, and the filter screen 72 is arranged in the top vent hole 52, the core sand cannot overflow the cavity 6, the filling degree of the core sand in the cavity 6 is improved, and the amount of air holes in the core sand is reduced; because the quantity of the core sand injected into the cavity 6 is quantitative when the sand core is manufactured, the sand core is firmer, the quantity of air holes formed by the sand core is reduced, and the strength of the formed sand core is improved; the top and the bottom of the cavity 6 can be exhausted, so that the overflow speed of air in the cavity 6 in the axial direction of the cavity is more uniform, the cavity 6 is conveniently filled with core sand, and the probability of the defect of the core sand is reduced; and meanwhile, the air holes in the sand core are distributed more uniformly in the axial direction, so that the strength of all parts of the sand core in the axial direction is more uniform, and the sand core is not easy to partially collapse when the sand core is used for casting the female end of the nodular cast iron pipe.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A core box convenient for air intake and exhaust is characterized by comprising a base (1), a lower die (2), an outer die (3), a core die (4) and an upper die (5), wherein the lower die (2) is fixedly connected on the base (1), the outer die (3) comprises a first half die (31) and a second half die (32), the first half die (31) and the second half die (32) are arranged in central symmetry along the axis of the lower die (2), the first half die (31) and the second half die (32) are connected with the base (1) in a sliding manner along the direction perpendicular to the axis of the lower die (2), the inner circumferential surfaces of the first half die (31) and the second half die (32) are abutted against the outer circumferential surface of the lower die (2), the core die (4) is coaxially arranged in the outer die (3), and the bottom end surface of the core die (4) is abutted against the top end surface of the lower die (2), go up mould (5) lid and establish on external mold (3), form die cavity (6) between lower mould (2), external mold (3), mandrel (4) and last mould (5), go up and seted up sand blasting hole (51) on mould (5), the one end of sand blasting hole (51) with die cavity (6) intercommunication, it has end exhaust hole (21) to set up on lower mould (2), end exhaust hole (21) quilt mandrel (4) cover, go up and seted up top exhaust hole (52) on mould (5), top exhaust hole (52) and die cavity (6) intercommunication.
2. A core box for facilitating air intake and exhaust according to claim 1, wherein: the top exhaust holes (52) and the bottom exhaust holes (21) are uniformly distributed along the axis of the lower die (2).
3. A core box for facilitating air intake and exhaust according to claim 2, wherein: a plurality of first ventilation grooves (22) are formed in the top end face of the lower die (2), the first ventilation grooves (22) correspond to the bottom vent holes (21) in a one-to-one mode, the first ventilation grooves (22) are communicated with the die cavity (6) and the bottom vent holes (21), and the depth of each first ventilation groove (22) is smaller than the grain size of core sand.
4. A core box for facilitating air intake and exhaust according to claim 1, wherein: the outer peripheral surface of the lower die (2) is provided with a plurality of second ventilation grooves (23), the second ventilation grooves (23) are uniformly distributed along the circumferential direction of the lower die (2), the second ventilation grooves (23) are communicated with the cavity (6) and the atmosphere, and the depth of the second ventilation grooves (23) is smaller than the particle size of the core sand.
5. A core box for facilitating air intake and exhaust according to any one of claims 1 to 4, wherein: and a filtering component (7) for filtering core sand is arranged in the top exhaust hole (52).
6. A core box for facilitating air intake and exhaust according to claim 5, wherein: the filter assembly (7) comprises a support ring (71) and a filter screen (72), the filter screen (72) is clamped on the support ring (71), the support ring (71) is coaxially clamped in the top exhaust hole (52), and the aperture of the filter screen (72) is smaller than the particle size of core sand.
7. A core box for facilitating air intake and exhaust according to claim 6, wherein: the support ring (71) and the top exhaust hole (52) are in interference fit, and a fillet is formed in one end, far away from the cavity (6), of the outer peripheral surface of the support ring (71).
8. A core box for facilitating air intake and exhaust according to claim 6, wherein: the filter screen (72) is arranged at one end, close to the cavity (6), of the support ring (71), and the filter screen (72) is flush with one end face, close to the cavity (6), of the upper die (5).
9. A core box for facilitating air intake and exhaust according to claim 6, wherein: the filter assembly (7) further comprises a support rod (73), the axis of the support rod (73) is perpendicular to the axis of the support ring (71), the support rod (73) is clamped on the inner circumferential surface of the support ring (71), and the support rod (73) is further abutted to one end face, far away from the cavity (6), of the filter screen (72).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021789121.6U CN213033577U (en) | 2020-08-24 | 2020-08-24 | Core box convenient to advance exhaust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021789121.6U CN213033577U (en) | 2020-08-24 | 2020-08-24 | Core box convenient to advance exhaust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213033577U true CN213033577U (en) | 2021-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021789121.6U Active CN213033577U (en) | 2020-08-24 | 2020-08-24 | Core box convenient to advance exhaust |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213033577U (en) |
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2020
- 2020-08-24 CN CN202021789121.6U patent/CN213033577U/en active Active
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