CN111957889B - Core box of core shooter - Google Patents
Core box of core shooter Download PDFInfo
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- CN111957889B CN111957889B CN202010854033.8A CN202010854033A CN111957889B CN 111957889 B CN111957889 B CN 111957889B CN 202010854033 A CN202010854033 A CN 202010854033A CN 111957889 B CN111957889 B CN 111957889B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/06—Core boxes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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Abstract
The application relates to a core box of a core shooter, which relates to the technical field of core making of ductile cast iron pipes and comprises a base, a lower die, an outer die, a core die and an upper die, wherein the lower die is fixedly connected on the base, the outer die is arranged on the base and comprises a first half die and a second half die, the inner peripheral surfaces of the first half die and the second half die are abutted to the outer peripheral surface of the lower die, the core die is coaxially arranged in the outer die, the bottom end surface of the core die is also abutted to the top end surface of the lower die, an upper die cover is arranged on the outer die, the top end surface of the core die is abutted to the bottom end surface of the upper die, a cavity is formed between the lower die, the outer die, the core die and the upper die, one end of the cavity close to the upper die is a core plate cavity, a sand spraying hole and a top exhaust hole are formed in the upper die, and one end of the sand spraying hole and the top exhaust hole, close to the core plate cavity, is communicated with the core plate cavity. The sand core manufactured by the application can not produce excess materials, saves core sand, saves labor force, improves the production efficiency of the sand core, and improves the casting precision when the sand core is used.
Description
Technical Field
The application relates to the technical field of core making of ductile cast iron pipes, in particular to a core box of a core shooter.
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.
Referring to fig. 1, most of the sand cores manufactured by the current core making machine include a working part 81, a sand core disc 82 and a remainder part 83, wherein the working part 81 directly participates in the forming of the female end of the nodular cast iron pipe when the sand core is used, and one end surface of the sand core disc 82 far away from the working part 81 is in contact with air and does not participate in the forming of the female end of the nodular cast iron pipe; in the related art, the excess part 83 is positioned at one end of the working part 81 far away from the sand core disc 82, and the excess part 83 needs to be cut after the sand core is manufactured by a core box, otherwise the excess part 83 can influence the molding of the female end of the nodular cast iron pipe.
The sand core is mostly manufactured through a core making machine and a core box, a cavity with the same shape as the sand core is arranged in the core box, and the inventor thinks that the sand core is easy to be damaged when cutting off the excess material part, so that the precision of the sand core is reduced, and the precision of the nodular cast iron pipe when the socket end is formed is further reduced; but also wastes materials and improves the labor intensity of workers.
Disclosure of Invention
In order to improve the precision of the sand core, the application provides a core box of a core shooter.
A core box of a core shooting machine 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 is arranged on the base and comprises a first half die and a second half die, the first half die and the second half die are arranged in a centrosymmetric mode along the axis of the lower die, the inner circumferential surfaces of the first half die and the second half die are abutted to 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 also abutted to the top end surface of the lower die, the upper die cover is arranged on the outer die, when the upper die cover is arranged on the outer die, the top end surface of the core die is abutted to the bottom end surface of the upper die, a cavity is formed among the lower die, the outer die, the core die and the upper die, one end of the cavity close to the upper die is a core disc cavity, and a bottom exhaust hole is formed in the lower die, the bottom exhaust hole is covered by the core mold, the upper mold is connected with the outer mold in a sliding mode, a sand spraying hole and a top exhaust hole are formed in the upper mold, and one ends, close to the sand core disc cavity, of the sand spraying hole and the top exhaust hole are communicated with the sand core disc cavity.
By adopting the technical scheme, when sand blasting is carried out, core sand and air enter the sand core disc cavity and the cavity from the sand blasting hole, the air in the cavity and the sand core disc cavity enters the bottom exhaust hole from a gap between the core mould and the lower mould and then is collected by the tail gas collecting device, or the air in the cavity and the sand core disc cavity enters the top exhaust hole and then is collected by the tail gas collecting device, so that the core sand is filled in the whole cavity, then triethylamine gas is introduced into the cavity and the sand core disc cavity through the top exhaust hole, meanwhile, the core sand forms the sand core under the catalysis of the triethylamine gas, the working part of the sand core is only connected with the sand core disc of the sand core, one end surface of the sand core disc of the sand core, which is far away from the working part, is a non-working surface, when the sand core is used, one end surface of the sand core disc, which is far away from the working part, is in contact with the air and does not participate in the molding of the female end of the nodular cast iron pipe, so that a surplus material part is not generated after the sand core is molded, the process step of polishing the sand core is omitted, so that the core sand is saved, the labor force is saved, the production efficiency of the sand core is improved, the probability of sand core damage is reduced and the precision of the sand core is improved as the sand core does not need to be reprocessed, and further the precision of the nodular cast iron pipe when the female end is molded is improved; because the sand core disc is far away from one end face of the working part and faces towards the upper die, a top vent hole can be formed in the upper die, the top vent hole can be formed, the speed of air overflowing in the cavity can be increased, the cavity can be filled with core sand conveniently, meanwhile, under the pressure when the core sand is injected, the air between the core sand can overflow from the cavity more easily, air holes in the formed sand core are reduced, the strength of the formed sand core is improved, the probability of the defect of the sand core is reduced, and meanwhile, the quality of the sand core cannot be influenced by the arrangement of the top vent hole.
The present application may be further configured in a preferred example to: the core mold is fixedly connected with the upper mold.
By adopting the technical scheme, when the mold is opened, the upper mold and the core mold can be removed simultaneously by moving the upper mold upwards along the axial direction of the lower mold, and then the first half mold and the second half mold are moved along the direction vertical to the axis of the lower mold to remove the outer mold, so that the mold opening of the core box is completed, the core mold does not need to be moved in the mold opening process, the probability of damage of the core is reduced, the precision of the core is improved, and further the precision of the socket end of the nodular cast iron pipe is improved, and because the upper mold and the core mold are removed simultaneously, the steps required in the mold opening process are reduced, and the mold opening efficiency is improved; and the upper die and the core die are relatively fixed, so that the upper die and the core die are not easy to relatively move when the upper die is moved, the probability that the core die damages the sand core when the die is opened is further reduced, and the precision of the sand core is improved.
The present application may be further configured in a preferred example to: the lower die is provided with a positioning hole along the axis of the lower die, the bottom end face of the core die is fixedly connected with a positioning shaft, the positioning shaft and the core die are coaxially arranged, when the bottom end face of the core die abuts against the top end face of the lower die, the positioning shaft penetrates through the positioning hole, the outer peripheral face of the positioning shaft abuts against the inner peripheral face of the positioning hole, and one end, far away from the core die, of the outer peripheral face of the positioning shaft is provided with a chamfer.
By adopting the technical scheme, when the mold is closed, the upper mold and the core mold slide downwards along the axis of the lower mold, when the bottom end surface of the core mold is about to abut against the top end surface of the lower mold, the positioning shaft is inserted into the positioning hole, and at the moment, the lower mold limits the core mold and the upper mold, so that the coaxiality between the lower mold and the core mold is improved, the wall thickness of the sand core in the circumferential direction of the sand core is more uniform, and the precision of the sand core is improved; when the mold is opened, the core shaft is not easy to collide with the sand core under the guidance of the positioning shaft, so that the precision of the sand core is improved; the positioning shaft is easier to insert into the positioning hole under the guidance of the chamfer, so that the die assembly efficiency of the core die and the lower die is improved.
The present application may be further configured in a preferred example to: the base is fixedly connected with a sliding rail parallel to the sliding direction of the first half die, the bottom end faces of the first half die and the second half die are fixedly connected with sliding blocks, and the sliding blocks are connected to the sliding rail in a sliding mode.
By adopting the technical scheme, the first half die and the second half die slide relative to the base through the slide block and the slide rail, the friction force between the first half die, the second half die and the base is reduced, the stability of the first half die and the second half die during sliding is improved, and further when the first half die and the second half die slide back to back, the probability of damage of the sand core caused by shaking of the first half die and the second half die is reduced, the precision of the sand core is improved, and the service life of the core box is prolonged.
The present application may be further configured in a preferred example to: the sliding rail is uniformly provided with a plurality of sliding blocks in the sliding direction perpendicular to the first half die, the sliding blocks on the first half die and the second half die are also provided with a plurality of sliding blocks, the sliding blocks on the first half die correspond to the sliding rails one to one, the sliding blocks on the second half die correspond to the sliding rails one to one, and the sliding blocks are wear-resistant sliding blocks.
By adopting the technical scheme, the first half die, the second half die and the base are stably supported, and when the first half die and the second half die slide back to back, the first half die and the second half die are not easy to generate tremble phenomenon, so that the probability of sand core damage caused by tremble of the first half die and the second half die is reduced, and the precision of the sand core is improved; because the slide block is a wear-resistant slide block, the outer die is not easy to deform when sliding, and the precision of the sand core is improved.
The present application may be further configured in a preferred example to: the first half die is characterized in that first positioning blocks are fixedly connected to the outer peripheral surfaces of two ends of the first half die, the first positioning blocks are abutted to the outer peripheral surfaces of two ends of the second half die, chamfers are arranged at two ends of the outer peripheral surface of the second half die, guide surfaces are formed at two ends of the second half die, the two guide surfaces correspond to the two first positioning blocks respectively, and the first positioning blocks can slide on the guide surfaces.
By adopting the technical scheme, when the mold is closed, the first half mold and the second half mold are limited by the first positioning block, the first half mold and the second half mold are not easy to generate dislocation perpendicular to the sliding direction of the first half mold, and then the inner peripheral surfaces of the first half mold and the second half mold are abutted with the outer peripheral surface of the lower mold, so that the mold closing of the first half mold, the second half mold and the lower mold is accurate, the manufacturing precision of the sand core is improved, and the first half mold and the second half mold are not easy to collide with the sand core under the guiding action of the first positioning block when the mold is opened, so that the precision of the sand core is improved; when the first half die and the second half die slide relatively, under the guidance of the guide surface, the first positioning block is more easily abutted to the outer peripheral surface of the second half die, so that the first half die and the second half die can be conveniently positioned, and the positioning success rate and efficiency are improved.
The present application may be further configured in a preferred example to: the base is fixedly connected with a second positioning block, the outer peripheral surfaces of two ends of the first half die and the second half die are fixedly connected with guide blocks, the second positioning block is provided with a guide groove matched with the guide blocks, and the guide blocks are inserted in the guide grooves.
By adopting the technical scheme, under the action of the guide block and the guide groove, the first half die and the second half die are not easy to generate relative jumping with the base along the axial direction of the lower die, so that when the first half die and the second half die slide back to back, the probability of sand core damage caused by jumping of the first half die and the second half die is reduced, and the precision of the sand core is improved; meanwhile, the guide block and the guide groove overcome the demolding force during demolding, the core mold is conveniently pulled out of the sand core, the first half mold and the second half mold are not easy to collide with each other, and the service life of the first half mold and the service life of the second half mold are prolonged.
The present application may be further configured in a preferred example to: the bottom vent holes are arranged in a plurality of uniformly distributed along the axis of the lower die, a plurality of first ventilation grooves are formed in the top end face of the lower die and are in one-to-one correspondence with the bottom vent holes, the first ventilation grooves are communicated with the cavity and the bottom vent holes, and the depth of each first ventilation groove is smaller than the particle size of 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: the top exhaust hole is internally provided with a filter assembly used for filtering core sand, 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, the aperture of the filter screen is smaller than the particle size of the core sand, the filter screen is arranged at the position where the support ring is close to one end of the cavity, and the filter screen is parallel and level with an end face of the upper die close to the cavity.
By adopting the technical scheme, air in the cavity can pass through the filter screen and overflow into the atmosphere, but core sand cannot pass through the filter screen and be discharged into the atmosphere, so that the core sand is saved; because the quantity of the core sand injected into the cavity is quantitative when the sand core is manufactured, the sand core is firmer, the quantity of air holes formed after the sand core is formed is reduced, and the strength of the formed sand core is improved; and after the core sand is injected into the cavity and the sand core is molded, a bulge is not easily formed on one end surface of the sand core plate of the sand core, which is far away from the working part, so that the sand core is convenient to store and transport.
In summary, the present application includes at least one of the following beneficial technical effects:
1. through the arrangement of the sand core tray cavity, the sand core does not produce excess materials, the core sand is saved, the process step of grinding the sand core is omitted, the production efficiency of the sand core is improved, and the sand core does not need to be reprocessed, so that the probability of the damage of the sand core is reduced, the precision of the sand core is improved, and the precision of the nodular cast iron pipe when the socket end is formed is improved; meanwhile, the labor force is saved, the production efficiency of the sand core is improved, and the casting precision when the sand core is used is improved; when the sand core is used, one end face of the sand core disc, which is far away from the working part, is contacted with air, so that the sand core disc does not participate in the molding of the female end of the nodular cast iron pipe, and the casting precision when the sand core is used is improved.
2. The core mould is arranged to be connected with the lower mould in a sliding mode along the axial direction of the lower mould, the first half mould and the second half mould are connected with the base in a sliding mode along the direction perpendicular to the axis of the lower mould, the core mould does not need to be moved in the mould opening process, the probability of damage of the core mould is reduced, the precision of the core mould is improved, and the precision of the socket end of the nodular cast iron pipe is further improved.
3. Through the arrangement of the sliding block and the sliding rail, the first half die and the second half die slide relative to the base through the sliding block and the sliding rail, the friction force between the first half die, the second half die and the base is reduced, the stability of the first half die and the second half die during sliding is improved, the probability of damage of the sand core caused by shaking of the first half die and the second half die is reduced when the first half die and the second half die slide back to back, and the precision of the sand core is improved.
4. Through the arrangement of the first ventilation groove and the second ventilation groove, the air circulation rate between the atmosphere and the cavity is improved, so that the exhaust efficiency of the bottom exhaust hole is improved, the overflow speed of the 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.
Drawings
Fig. 1 is a schematic view of the overall structure of a sand core of the related art;
FIG. 2 is a schematic overall structure diagram of an embodiment of the present application;
fig. 3 is a schematic view showing the entire structure of the core mold when it is opened in the embodiment of the present application;
FIG. 4 is an enlarged view of portion A of FIG. 3;
FIG. 5 is a schematic view showing the entire structure of the core mold and the upper mold in the embodiment of the present application;
FIG. 6 is a schematic view of the overall construction of a filter assembly according to an embodiment of the present application;
fig. 7 is a schematic view of the overall structure of the sand core manufactured by the embodiment of the present application.
Reference numerals: 1. a base; 11. a slide rail; 12. a second positioning block; 121. a guide groove; 2. a lower die; 21. a bottom vent; 22. a first gas-permeable groove; 23. a second air-permeable groove; 24. positioning holes; 3. an outer mold; 31. a first mold half; 311. a first positioning block; 32. a second mold half; 321. a guide surface; 33. a slider; 34. a guide block; 4. a core mold; 41. positioning the shaft; 5. an upper die; 51. sand blasting holes; 52. a top vent; 6. a cavity; 61. a sand core disc cavity; 7. a filter assembly; 71. a support ring; 72. a filter screen; 73. a support bar; 81. a working part; 82. a sand core disc; 83. a residual material part.
Detailed Description
The present application is described in further detail below with reference to figures 1-7.
Referring to fig. 1, in the related art, most of the sand cores manufactured by the core making machine include a working portion 81, a sand core disc 82 and a remainder portion 83, when the sand core is used, the working portion 81 directly participates in the forming of the socket end of the nodular cast iron pipe, and an end surface of the sand core disc 82 far away from the working portion 81 is in contact with air and does not participate in the forming of the socket end of the nodular cast iron pipe; in the related art, the excess part 83 is positioned at one end of the working part 81 far away from the sand core disc 82, and the excess part 83 needs to be cut after the sand core is manufactured by a core box, otherwise the excess part 83 can influence the molding of the female end of the nodular cast iron pipe.
The embodiment of the application discloses a core box of a core shooter. Referring to fig. 2 and 3, a core box of the core shooter 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 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. 2 and 3, 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, and one end of the cavity 6 close to the upper die 5 is a sand core disc cavity 61.
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 exhaust holes 52 are formed in the upper die 5, the sand blasting holes 51 and the top exhaust holes 52 are uniformly distributed along the axis of the lower die 2, and one ends of the sand blasting holes 51 and the top exhaust holes 52 close to the sand core disc cavity 61 are communicated with the sand core disc cavity 61.
Referring to fig. 3 and 4, a plurality of first ventilation grooves 22 are formed in the top end surface of the lower mold 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 the first ventilation grooves 22 is smaller than the particle size of the core sand. The peripheral surface of the lower die 2 is also 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 grain diameter of the core sand. 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 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.
Referring to fig. 5 and 6, 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 grain diameter of the core sand, and the filter screen 72 is clamped at one axial end 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 installed in the top vent hole 52, the filter mesh 72 is disposed at one end of the support ring 71 close to the cavity 6, and the filter mesh 72 is flush with one end surface 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. 3 and 6, 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 supporting rod 73 is arranged, after the core sand is injected into the cavity 6 and the sand core is molded, the filter screen 72 is not easy to deform, so that a bulge is not easy to form on one end surface of the sand core disc 82 of the sand core, which is far away from the working part 81, and the storage and the transportation of the sand core are convenient.
Referring to fig. 3 and 5, since the lower mold 2 is annular, the positioning hole 24 is formed on the lower mold 2 along the axis thereof, the positioning shaft 41 is integrally formed on the bottom end surface of the core mold 4, the positioning shaft 41 is coaxially disposed with the core mold 4, and the outer diameter of the positioning shaft 41 is the same as the inner diameter of the core mold 4; the positioning shaft 41 has a chamfer on its outer peripheral surface at an end remote from the core mold 4. When the mold is closed, the positioning shaft 41 is inserted into the positioning hole 24 under the guidance of the chamfer, and the positioning shaft 41 is fully inserted into the positioning hole 24 to give importance to the bottom end surface of the core mold 4 to be in contact with the top end surface of the lower mold 2.
Referring to fig. 2 and 3, the base 1 is fixedly connected with a slide rail 11 parallel to the sliding direction of the first half die 31 through a countersunk head bolt, the bottom end surfaces of the first half die 31 and the second half die 32 are both fixedly connected with a slide block 33 through a countersunk head bolt, and a plurality of slide rails 11 are uniformly arranged along the sliding direction perpendicular to the first half die 31; a plurality of sliding blocks 33 are arranged on the first half die 31 and the second half die 32, the sliding blocks 33 on the first half die 31 correspond to the sliding rails 11 one by one, the sliding blocks 33 on the second half die 32 correspond to the sliding rails 11 one by one, and the sliding blocks 33 are connected to the sliding rails 11 in a sliding manner. Because the sliding block 33 is a wear-resistant sliding block, the first half die 31 and the second half die 32 are not easy to deform, and the precision of the first half die 31 and the second half die 32 after long-time use is improved.
Referring to fig. 2 and 3, the first positioning blocks 311 are fixedly connected to the outer peripheral surfaces of both ends of the first mold half 31 by means of countersunk bolts, and the first positioning blocks 311 abut against the outer peripheral surfaces of both ends of the second mold half 32. Chamfers are arranged at two ends of the outer peripheral surface of the second half die 32, so that guide surfaces 321 are formed at two ends of the second half die 32, when the first half die 31 and the second half die 32 are closed, the second half die 32 enables the outer peripheral surfaces at two ends of the second half die 32 to be abutted to the positioning blocks under the guide of the guide surfaces 321, and then the positioning of the first half die 31 and the second half die 32 is completed, so that the closing of the first half die 31, the second half die 32 and the lower die 2 is accurate, and the accuracy of sand core manufacturing is improved. When the first half die 31 and the second half die 32 are opened, the positioning block can also guide the first half die 31 and the second half die 32, so that the first half die 31 and the second half die 32 are not easy to collide with the sand core, and the precision of the sand core is improved.
Referring to fig. 2 and 3, the base 1 is further fixedly connected with a second positioning block 12 through a countersunk head bolt, the outer peripheral surfaces of the two ends of the first half die 31 and the second half die 32 are both fixedly connected with a guide block 34 through a countersunk head bolt, the second positioning block 12 is provided with a guide groove 121 matched with the guide block 34, and the guide block 34 is inserted into the guide groove 121. The guide block 34 and the guide groove 121 guide the first half die 31 and the second half die 32, and the first half die 31 and the second half die 32 are not easy to jump relative to the base 1 along the axial direction of the lower die 2, so that when the first half die 31 and the second half die 32 slide away from each other, the probability of damage of the sand core caused by jumping of the first half die 31 and the second half die 32 is reduced, and the precision of the sand core is improved.
Referring to fig. 7, the sand core manufactured by the embodiment of the application does not generate a residual part, omits the process step of sand core polishing, improves the production efficiency of the sand core, reduces the probability of sand core damage and improves the precision of the sand core as the sand core does not need to be reprocessed, thereby improving the precision of the nodular cast iron pipe when the socket end is molded; when the sand core is used, one end surface of the sand core disc 82 far away from the working part 81 is contacted with air, and does not participate in the forming of the female end of the nodular cast iron pipe, so that the precision of the forming of the female end of the nodular cast iron pipe is improved.
The core box of the core shooter in the embodiment is implemented according to the following principle:
when the mold is closed, the first half mold 31 and the second half mold 32 are relatively slid to be mutually abutted, then the core mold 4 and the upper mold 5 are slid along the axial direction of the lower mold 2 until the bottom end surface of the core mold 4 is abutted with the top end surface of the lower mold 2, at this time, the bottom end surface of the upper mold 5 is abutted with the top end surface of the outer mold 3, and the lower mold 2, the outer mold 3, the core mold 4 and the upper mold 5 are precisely closed under the positioning action of the first positioning block 311, the second positioning block 12 and the positioning shaft 41; then, core sand is sprayed into the cavity 6 through the sand spraying holes 51, at the moment, air in the cavity 6 overflows out of the cavity 6 from the bottom vent hole 21, the second ventilating groove 23 and the top vent hole 52 respectively, and due to the arrangement of the first ventilating groove 22, the second ventilating groove 23 and the filtering component 7, the core sand cannot overflow out of the cavity 6, so that 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; then, the sand-blasting hole 51 is sealed, triethylamine gas is filled into the cavity 6 through the top exhaust hole 52, core sand is catalyzed by the triethylamine gas to form a sand core, then the upper die 5 and the core die 4 are opened along the axial direction of the lower die 2, and then the first half die 31 and the second half die 32 are opened, so that the molding of the primary sand core is completed; after the sand core is formed, no excess material part is generated, the process step of grinding the sand core is omitted, the production efficiency of the sand core is improved, and the sand core does not need to be reprocessed, so that the probability of sand core damage is reduced, the precision of the sand core is improved, and the precision of the nodular cast iron pipe when the female end is formed is further improved; when the sand core is used, one end surface of the sand core disc 82 far away from the working part 81 is contacted with air, and does not participate in the forming of the female end of the nodular cast iron pipe, so that the precision of the forming of the female end of the nodular cast iron pipe is improved.
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 (8)
1. A core box of a core shooting machine 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 to the base (1), the outer die (3) is arranged 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 inner circumferential surfaces of the first half die (31) and the second half die (32) are abutted to the outer circumferential surface of the lower die (2), the core die (4) is coaxially arranged in the outer die (3), the bottom end surface of the core die (4) is also abutted to the top end surface of the lower die (2), the upper die (5) is covered on the outer die (3), when the upper die (5) is covered on the outer die (3), the top end surface of the core die (4) is abutted against the bottom end surface of the upper die (5), a cavity (6) is formed between the lower die (2), the outer die (3), the core die (4) and the upper die (5), a sand core disc cavity (61) is arranged at one end of the cavity (6) close to the upper die (5), a bottom exhaust hole (21) is formed in the lower die (2), the bottom exhaust hole (21) is covered by the core die (4), the upper die (5) is connected with the outer die (3) in a sliding manner, a sand spraying hole (51) and a top exhaust hole (52) are formed in the upper die (5), and one ends of the sand spraying hole (51) and the top exhaust hole (52) close to the sand core disc cavity (61) are communicated with the sand core disc cavity (61); the core die (4) is fixedly connected with the upper die (5)
A filtering assembly (7) for filtering core sand is arranged in the top exhaust hole (52), the filtering 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), the aperture of the filter screen (72) is smaller than the particle size of the core sand, 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);
the support ring (71) is provided with a support rod (73), the support rod (73) is arranged on one side, away from the cavity (6), of the filter screen (72), and the peripheral surface of the support rod (73) is abutted to one end face, away from the cavity (6), of the filter screen (72).
2. A core box of a core shooter according to claim 1, characterized in that: the positioning structure is characterized in that the lower die (2) is provided with a positioning hole (24) along the axis of the lower die, a positioning shaft (41) is fixedly connected to the bottom end face of the core die (4), the positioning shaft (41) and the core die (4) are coaxially arranged, when the bottom end face of the core die (4) is abutted to the top end face of the lower die (2), the positioning shaft (41) penetrates through the positioning hole (24), the outer peripheral face of the positioning shaft (41) is abutted to the inner peripheral face of the positioning hole (24), and one end, far away from the core die (4), of the outer peripheral face of the positioning shaft (41) is provided with a chamfer.
3. A core box of a core shooter according to claim 1, characterized in that: the base (1) is fixedly connected with a sliding rail (11) parallel to the sliding direction of the first half die (31), the bottom end faces of the first half die (31) and the second half die (32) are fixedly connected with sliding blocks (33), and the sliding blocks (33) are connected to the sliding rail (11) in a sliding mode.
4. A core box of a core shooter according to claim 3, characterized in that: the sliding rail (11) is uniformly provided with a plurality of sliding blocks (33) in the first half die (31) along the direction perpendicular to the sliding direction of the first half die (31), the first half die (31) and the second half die (32) are also provided with a plurality of sliding blocks (33), the sliding blocks (33) on the first half die (31) correspond to the sliding rails (11) one by one, the sliding blocks (33) on the second half die (32) correspond to the sliding rails (11) one by one, and the sliding blocks (33) are wear-resistant sliding blocks.
5. A core box of a core shooter according to claim 3, characterized in that: equal fixedly connected with first locating piece (311) on the outer peripheral face at the both ends of first half mould (31), first locating piece (311) with the outer peripheral face butt at the both ends of second half mould (32), the chamfer has all been seted up at the both ends of the outer peripheral face of second half mould (32), makes the both ends of second half mould (32) all form spigot surface (321), two spigot surface (321) correspond two respectively first locating piece (311), just first locating piece (311) slidable is in on spigot surface (321).
6. A core box of a core shooter according to claim 3, characterized in that: the base (1) is fixedly connected with a second positioning block (12), the outer peripheral surfaces of two ends of the first half die (31) and the second half die (32) are fixedly connected with guide blocks (34), the second positioning block (12) is provided with a guide groove (121) matched with the guide blocks (34), and the guide blocks (34) are inserted into the guide groove (121).
7. A core box of a core shooter according to any one of claims 1 to 6, characterized in that: the bottom vent holes (21) are formed in a plurality of positions, the bottom vent holes (21) are uniformly distributed along the axis of the lower die (2), a plurality of first ventilation grooves (22) are formed in the top end face of the lower die (2), the first ventilation grooves (22) are in one-to-one correspondence with the bottom vent holes (21), the first ventilation grooves (22) are communicated with the 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.
8. A core box of a core shooter according to claim 7, characterized in that: 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010854033.8A CN111957889B (en) | 2020-08-24 | 2020-08-24 | Core box of core shooter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010854033.8A CN111957889B (en) | 2020-08-24 | 2020-08-24 | Core box of core shooter |
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| CN111957889A CN111957889A (en) | 2020-11-20 |
| CN111957889B true CN111957889B (en) | 2022-04-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101700561A (en) * | 2009-08-19 | 2010-05-05 | 宁波全力机械模具有限公司 | Mold of railway vehicle coupler inner chamber integrated core vertical parting cold core box |
| CN204171278U (en) * | 2014-10-21 | 2015-02-25 | 胜利油田胜利泵业有限责任公司 | Submersible electric pump guide wheel foundry sand mould |
| CN204171274U (en) * | 2014-10-21 | 2015-02-25 | 胜利油田胜利泵业有限责任公司 | Submersible electric pump pump vane casting sand mold mould |
| CN204867300U (en) * | 2015-08-05 | 2015-12-16 | 新兴铸管股份有限公司 | Psammitolite and make core box of this psammitolite |
| CN106862514A (en) * | 2015-12-11 | 2017-06-20 | 黄石新兴管业有限公司 | A kind of production method of ductile iron pipe with end face typefounding |
| CN207154691U (en) * | 2017-08-18 | 2018-03-30 | 象山洲海模具研发中心有限公司 | A kind of power transmission and distribution housing die for manufacturing |
| CN207547533U (en) * | 2017-10-17 | 2018-06-29 | 华南理工大学广州学院 | A kind of new-energy automobile water cooling motor housing integral sand core hot core box mould |
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