CN219292673U

CN219292673U - Cold core box die with exhaust structure on top core rod

Info

Publication number: CN219292673U
Application number: CN202223570102.6U
Authority: CN
Inventors: 董彦刚; 刘召朋; 时俊杰; 薛少华; 侯桂林
Original assignee: China National Heavy Duty Truck Group Hangzhou Engine Co ltd
Current assignee: China National Heavy Duty Truck Group Hangzhou Engine Co ltd
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-07-04
Anticipated expiration: 2032-12-31

Abstract

The utility model belongs to the technical field of casting, and discloses a cold core box die with an exhaust structure on a top core rod, which comprises an upper core box, a lower core box, a sand shooting plate, a blowing plate, an upper top core plate, a lower top core plate and a plurality of top core rods, wherein the top core rods comprise a first type of top core rods, and rod bodies of the first type of top core rods are solid structures with cylindrical outer contours; the top core rod further comprises a second type top core rod, the second type top core rod is provided with an exhaust structure, the outer outline of the rod body of the second type top core rod is cylindrical, a counter bore is formed in the head of the rod body, an exhaust plug is arranged in the counter bore, an exhaust channel is arranged in the rod body, the upper end of the exhaust channel is communicated with the counter bore, and the lower end of the exhaust channel is communicated with the outside of the core cavity. According to the utility model, the top core rod with the exhaust structure is arranged at the core cavity part which is not easy to be stripped and has a small space, and when the core is manufactured, the gas catalyst can be exhausted out of the core cavity through the top core rod exhaust structure, so that the gas catalyst can flow in the core sand and the quality of the sand core can be ensured.

Description

Cold core box die with exhaust structure on top core rod

Technical Field

The utility model belongs to the technical field of casting, relates to a cold box die, in particular to an exhaust technology of the cold box die, and particularly relates to an exhaust structure designed on a top core rod.

Background

In the casting production process, the sand core is an indispensable intermediate product, and the sand core forming method comprises the following steps: a method for quickly filling the core sand mixed on a sand shooting plate into the core cavity of a cold core box die by compressed air in a room temperature environment includes such steps as blowing gas catalyst into the core cavity by compressed air through the sand shooting mouth cavity of the upper core box after the core cavity is filled, shuttling the gas catalyst in the core sand to solidify the sand core, and discharging the residual gas catalyst out of and under the core cavity by the exhaust structure such as exhaust plug and exhaust hole.

In the process of sand core production, a cold core box mould is needed to be used for core making, the cold core box mould consists of an upper core box, a lower core box, a core cavity of the mould formed by combining, a sand shooting plate, a blowing plate, an upper top core plate, a lower top core plate and a top core rod, and when the manufactured sand core is in demolding, all the top core rods distributed on the lower top core plate are lifted uniformly under the action of a hydraulic cylinder, and the top core rod acts on the sand core to meet the demolding requirement of the sand core. On the one hand, the shape structure of the sand core is various, the position of the sand core which is not easy to be stripped is required to design the top core rod, on the other hand, the space of the position of the sand core which is not easy to be stripped is limited, in order to ensure the normal stripping of the sand core, the top core rod structure is designed preferentially, but the existing top core rod structure is not beneficial to the flow of a gas catalyst in a core cavity, the core making quality of the local position of the sand core cannot be ensured, and the quality of the sand core cannot be directly influenced by the quality of the sand core due to the quality of the exhaust gas.

Disclosure of Invention

The utility model aims to solve the technical problems that: in the prior art, when the exhaust hole and the top core rod cannot be arranged at the same time due to space limitation, the core making quality of the local position of the sand core cannot be guaranteed, and the cold core box die with the exhaust structure on the top core rod is provided.

In order to solve the problems, the utility model adopts the following technical scheme: the cold core box die with the exhaust structure comprises an upper core box, a lower core box, a sand shooting plate, a blowing plate, an upper top core plate, a lower top core plate and a plurality of top core rods, wherein the upper core box and the lower core box are combined to form a core cavity of the die, the top core rods comprise a first type of top core rod, the first type of top core rod is a conventional top core rod, and a rod body of the first type of top core rod is a solid structure with a cylindrical outline; the novel high-pressure air-tight core rod is characterized by further comprising a second type top core rod, wherein the second type top core rod is provided with an air exhaust structure, the second type top core rod is arranged at a core cavity part with a smaller space than that of the first type top core rod, the outer contour of a rod body of the second type top core rod is cylindrical, a counter bore is arranged at the head of the rod body, an air exhaust plug is arranged in the counter bore, an air exhaust channel is arranged in the rod body, the upper end of the air exhaust channel is communicated with the counter bore, and the lower end of the air exhaust channel is communicated with the outside of the core cavity.

According to the scheme, except the conventional top core rod, the exhaust structure is added to the top core rod at the core cavity position which is not easy to be stripped and is narrow in space, when the cold core box die is used for making cores, the top core rod is flush with the core cavity surface to ensure that the shape of the sand core meets the requirement, in the sand core curing process, the gas catalyst can be exhausted out of the core cavity through the exhaust structure of the top core rod, and the quality of the sand core is ensured while the gas catalyst flows in the core sand.

Further, the top core rod further comprises a third top core rod, the third top core rod is provided with an exhaust structure, the third top core rod is arranged at a core cavity position which is narrower than the second top core rod in arrangement position space, the rod body of the third top core rod is divided into an upper section and a lower section, the lower section rod body is of a solid structure with a cylindrical outline, the upper section rod body is of a solid structure with a polygonal outline, the section of the upper section rod body is polygonal, and the diameter of an outer ring of the polygonal is equal to that of the lower section rod body.

Further, the top core rod further comprises a fourth top core rod, the fourth top core rod is arranged at a core cavity part deeper than the die drawing depth of the second top core rod, the rod body of the fourth top core rod is divided into an upper section and a lower section, the lower section rod body is of a solid structure with a cylindrical outline, the outline of the upper section rod body is in a polygonal shape, the cross section outline of the upper section rod body is polygonal, and the diameter of an outer ring of the polygonal shape is equal to that of the lower section rod body; the head of the upper section rod body is provided with a counter bore, an exhaust plug is arranged in the counter bore, an exhaust channel is arranged in the rod body, the upper end of the exhaust channel is communicated with the counter bore, and the lower end of the exhaust channel is communicated with the outside of the core cavity.

According to the cold core box die, the top core rod with the exhaust structure is arranged, so that the core making quality of the cold core box die is effectively improved, the structure is simple and convenient to operate, the die space can be effectively utilized, and the sand core quality is remarkably improved.

Three kinds of top core bars with exhaust structures have the following characteristics:

1. the structure of the second type top core rod is a cylindrical rod with a flange, an exhaust channel with the diameter more than or equal to 5mm is added to a certain depth at the head part of the top core rod, the depth is required to be larger than the thickness of the lower core box, a counter bore with a certain diameter is added at the head part of the top core rod, so that an exhaust plug is convenient to install, a gas catalyst can be conveniently discharged from a core cavity to a lower die frame through the exhaust channel, the top core rod of the specification meets the requirement of the flow of the gas catalyst during the core making of a sand core while meeting the requirement of the mold stripping of the sand core, the quality of the sand core is ensured, the number of core rod holes and exhaust holes of the mold top core rod is reduced, and the manufacturing complexity of the mold is reduced.

2. The outer side of the third type of top core rod is of a polygonal structure, the inside of the top core rod is free of an exhaust channel, the top core rod is suitable for the top core rod with a certain diameter size, and the first type of top core rod is too small in diameter and has high difficulty in manufacturing the exhaust channel; secondly, the exhaust passage is limited by the size of the top core rod, the size of the exhaust passage is very limited, when the core is manufactured, the granularity of core sand is different, part of core sand can enter the exhaust passage, the exhaust passage is easy to be blocked, and the fluidity of a gas catalyst is reduced when the core is manufactured.

3. The fourth type of ejection core rod belongs to a further improvement of the second type of ejection core rod and the third type of ejection core rod, in order to ensure the fluidity of gas in a core cavity, a polygonal structure is added on the outer side of the ejection core rod aiming at the ejection core rod with an exhaust channel, the fit clearance between the polygonal structure and an ejection rod hole is smaller than the granularity size of core sand, and the shape of a sand core is ensured while the air is exhausted.

Drawings

Fig. 1 is a schematic top view of a cold box mold of the present utility model.

Fig. 2 is a view from A-A in fig. 1.

Fig. 3 is a schematic view of the structure of a first type of the top core rod (conventional top core rod) according to the present utility model.

FIG. 4 is a schematic view of a second type of top core rod according to the present utility model.

FIG. 5 is a schematic view of a third exemplary top core rod according to the present utility model.

FIG. 6 is a schematic view of a fourth core rod according to the present utility model.

Detailed Description

The utility model discloses a cold core box die with an exhaust structure on a top core rod. The top core rod mainly has three improved structures: 1. an exhaust channel is added at the center of the existing top core rod, an exhaust plug is used for covering the exhaust channel to make up the top shape of the top core rod, the peripheries of the second core rod and the top core rod are designed to be polygonal structures, and the peripheries of the third core rod and the top core rod with the exhaust plug structure are designed to be polygonal structures. A detailed description of a top core rod embodiment of the venting structure will now be provided with reference to the accompanying drawings.

Referring to fig. 1 and 2, the cold core box mold of the present utility model includes a lower mold frame 1, a lower core plate top column 2, a first conventional core rod 3, a second core rod 4 with a vent plug, a third polygonal core rod 5, a fourth polygonal core rod 6 with a vent plug, a lower core plate 7, a vent pipe 8, a lower core box 9, an upper core box 10, and a sand shooting plate 11, wherein the lower end of the core rod is fastened to the lower core plate 7 by screws. The lower top core plate top column 2 is fastened on the other side of the lower top core plate 7 through threads.

When the cold core box is used for core making, core sand enters a core cavity formed by the lower core box 9 and the upper core box 10 through the sand shooting plate 11 under the action of high-pressure air, a gas catalyst enters the core cavity through the back of the upper core box 10, the purpose of solidifying the sand core is achieved in the flowing process of the gas catalyst in the core sand, after the sand core is solidified, the lower top core plate jacking column 2 pushes the lower top core plate 7 to drive the top core plate to lift under the action of the hydraulic cylinder, and the sand core is jacked up so as to be taken out.

In order to improve the quality of the sand core, when the vent plug cannot be arranged at the position of the die locally corresponding to the sand core, under the condition, three top core rods with vent structures are respectively applied in the following scenes:

1. the local position of the sand core is convex, a certain depth groove structure is arranged at the corresponding position of the mould, the groove position is required to be preferentially arranged with the top core rod, and the top core rod and the exhaust plug cannot be simultaneously arranged due to the limited size of the groove position, and under the condition that the exhaust channel cannot be increased or the small exhaust effect of the exhaust through hole cannot be achieved by the arranged top core rod, the third polygonal top core rod 5 is matched with the lower core box 9, the matching clearance between the top core rod 5 and the lower core box is less than or equal to 0.2mm, the length of the polygonal structure is required to be ensured to be discharged after being communicated to the frame of the lower mould frame 1, the sand leakage phenomenon is effectively prevented, the flow of a gas catalyst is facilitated, and the quality of the sand core is ensured;

2. when the local position of the sand core is easy to break, the intensity of the lap joint position is lower, the sand core is required to ensure stable stripping, the top core rod is designed preferentially, but the exhaust plugs are difficult to arrange, the size of the top core rod is enough to manufacture an exhaust channel, and the exhaust effect of the exhaust channel is good, in this case, the second top core rod 4 with the exhaust plugs is used, the depth of the designed exhaust channel is ensured to be discharged after being communicated to the frame of the lower die frame 1, the core making quality of the sand core is ensured while the top core is not influenced;

3. when the local position of the sand core is protruding, the corresponding recess depth of mould is darker, in order to be convenient for sand core drawing, the mould recess position must the preferential design arrange the top core bar, and when the exhaust channel exhaust effect of top core bar design is insufficient to guarantee sand core quality, can use the polygon top core bar 6 of fourth kind area exhaust plug, optimized gas catalyst in local mobility when not influencing sand core drawing, effectually guaranteed sand core quality.

It should be understood that: the above embodiments are merely illustrative of the present utility model, not limiting, and any utility model that does not fall within the spirit and scope of the present utility model falls within the scope of the present utility model.

Claims

1. The cold core box die with the exhaust structure comprises an upper core box, a lower core box, a sand shooting plate, a blowing plate, an upper top core plate, a lower top core plate and a plurality of top core rods, wherein the upper core box and the lower core box are combined to form a core cavity of the die, the top core rods comprise a first type of top core rods, and rod bodies of the first type of top core rods are solid structures with cylindrical outer contours; the core ejecting rod is characterized by further comprising a second type core ejecting rod, wherein the second type core ejecting rod is arranged at a core cavity part with a smaller space than that of the first type core ejecting rod, the outer contour of a rod body of the second type core ejecting rod is cylindrical, a counter bore is formed in the head of the rod body, a vent plug is arranged in the counter bore, a vent channel is formed in the rod body, the upper end of the vent channel is communicated with the counter bore, and the lower end of the vent channel is communicated with the outside of the core cavity.

2. The cold-box die of claim 1, wherein the top core rod further comprises a third top core rod, the third top core rod is arranged at a core cavity position with a smaller space than that of the second top core rod, the rod body of the third top core rod is divided into an upper section and a lower section, the lower section rod body is of a solid structure with a cylindrical outline, the upper section rod body is of a solid structure with a polygonal outline, the section of the upper section rod body is polygonal, and the diameter of an outer ring of the polygonal is equal to that of the lower section rod body.

3. The cold box mold according to claim 2, wherein the top core rod further comprises a fourth top core rod, the fourth top core rod is arranged at a core cavity position deeper than the die drawing depth of the second top core rod, the rod body of the fourth top core rod is divided into an upper section and a lower section, the rod body of the lower section is of a solid structure with a cylindrical outline, the outline of the rod body of the upper section is in a polygonal shape, the outline of the section of the rod body of the upper section is a polygon, and the diameter of an outer ring of the polygon is equal to the diameter of the rod body of the lower section; the head of the upper section rod body is provided with a counter bore, an exhaust plug is arranged in the counter bore, an exhaust channel is arranged in the rod body, the upper end of the exhaust channel is communicated with the counter bore, and the lower end of the exhaust channel is communicated with the outside of the core cavity.