CN216938304U

CN216938304U - Positioning structure between sand cores for large casting die assembly process

Info

Publication number: CN216938304U
Application number: CN202220226084.0U
Authority: CN
Inventors: 李冠昕
Original assignee: Shanghai No1 Machine Tool Foundry Suzhou Co ltd
Current assignee: Shanghai No1 Machine Tool Foundry Suzhou Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-07-12
Anticipated expiration: 2032-01-25

Abstract

A positioning structure between sand cores for a large casting die assembly process comprises a sand box, molding sand and a combined type core; the molding sand is in the sand box, and a cavity in the molding sand forms a cavity for molding a casting; the combined type mold core is arranged in the mold cavity through the mold core seat; the combined type mold core is composed of a plurality of unit mold cores, and the adjacent unit mold cores are separated by gap cushion blocks. The gap cushion block is an air bag; the air bag is connected with an air pipe, and an air valve is connected on the air pipe; the trachea is in the trachea channel; the air pipe channel has two parts, the first air pipe channel is in the gap between the unit mold cores, and the second air pipe channel is embedded in the molding sand; one end of the second air pipe channel is positioned corresponding to the core print seat, and the other end of the second air pipe channel is positioned on the side wall of the sand box; the air valve is arranged outside the sand box. The device can greatly save the workload of the production process, reduce the production working hours, improve the working efficiency, improve the quality stability and avoid sand inclusion defects and dimensional deviation.

Description

Positioning structure between sand cores for large casting die assembly process

Technical Field

The utility model relates to the technical field of casting production, in particular to a core fixing structure for a large casting mold closing process.

Background

In the method for molding the extra-large casting mould fupyran resin sand, a plurality of products need to be matched with large-size sand cores (also called as mud cores, which are one type of the sand cores) with different quantities. The volume and the structure of the super-huge products such as wind power shells are complex, and the clay core combination (core assembly modeling) is a common process. Positioning of sand cores is particularly important in core assembly molding (assembling a mold from multiple sand cores), and is usually supported and adjusted by inserting soft fixing materials, such as foam blocks, cushion blocks, etc., into the gaps between small sand cores (also called segments). The mode often causes friction between the fixing material and the sand core, so that sand grains fall into the cavity, the cavity needs to be cleaned repeatedly, time and labor are consumed, and the defect that sand is clamped in a casting is easily caused if the cavity is not cleaned completely. Meanwhile, the mode is not firm, the sand core can be deviated in the sand core positioning and box turning process, the size is poor, or the positioning cushion block falls into the cavity and is difficult to take out, so that the sand box needs to be turned back again to take out the sand core, the cushion block can be taken out, all the working procedures are operated again, and the wastes of manpower, material resource time, station consumption, equipment waiting and the like are huge.

Such as chinese patent 2016210948594, a sand box with a core, which positions the core by a relatively complex fixing structure. This loam core fixed knot constructs's use limitation is stronger, and the loam core position for the molding needs to be close to with the sand box case lid.

Disclosure of Invention

For the difficulty, the utility model provides a sand core fixing structure with strong universality, and the structure can be suitable for positioning the sand cores under various position structures.

A positioning structure between sand cores for a large casting die assembly process comprises a sand box, molding sand and a combined type core; the molding sand is in the sand box, and a cavity in the molding sand forms a cavity for molding a casting; the combined type mold core is arranged in the mold cavity through the mold core seat; the combined type mold core is composed of a plurality of unit mold cores, and the adjacent unit mold cores are separated by gap cushion blocks.

The gap cushion block is an air bag; the air bag is connected with an air pipe, and an air valve is connected on the air pipe; the trachea is in the trachea channel; the air pipe channel has two parts, the first air pipe channel is in the gap between the unit mold cores, and the second air pipe channel is embedded in the molding sand; one end of the second air pipe channel is positioned corresponding to the core print seat, and the other end of the second air pipe channel is positioned on the side wall of the sand box; the air valve is arranged outside the sand box.

The positioning structure adopts the air bag to replace a foam cushion block, a soft cushion and the like in the prior art as a gap cushion block. The inflatable air bag is applied, the inflation amount can be adjusted according to the position required to be fixed by the unit sand core, and the core setting position is fixed. The structure can avoid the quality problem of sand wiping caused by the cushion blocks.

The air pipe is placed through the gap between the unit cores, the core print seat and the air pipe channel in the sand box, so that the influence on the cavity is avoided. The second air duct channel also serves the function of dissipating the waste air from the molding sand during the casting process.

Further: the air valve is a three-way air valve, and three ends of the three-way air valve are respectively connected with an air pipe, an air source and the atmosphere; the air pipe is respectively communicated with an air source and the atmosphere through a valve; one end of the three-way air valve connected with the air source is connected with a one-way air valve. Through this structure, be convenient for on-the-spot use and adjust atmospheric pressure etc.. The values on the gun may be referenced when adjusting the air pressure.

Further: the second air pipe channel comprises a vertical section and a horizontal section, the vertical section of the second air pipe channel is arranged right below the core print seat, and the horizontal section of the second air pipe channel is far away from the cavity part. Make the second trachea lead to and keep away from the die cavity as far as possible under this structure, avoid bringing negative effects to the structural strength of die cavity.

And further: the sand box is divided into a plurality of sand boxes, and all the sand boxes are spliced along a parting surface. The utility model is applicable to various sand box structures, such as a single box body, two box bodies, three box bodies and the like.

And further: also comprises a chill; the chiller is in the combined type mold core, and the gap cushion block between the chiller and the adjacent unit mold core is an air bag. With the structure, the shrinkage of the casting at a specific position can be controlled and the directional solidification can be obtained by placing the chiller at the specific position of the core. The air bag can assist in positioning the chilling block.

And further: the unit core is a sand core made of molding sand. The unit core may be a core made of other materials.

And further: each air bag is correspondingly connected with an air pipe, and the air valve of the air pipe is provided with a mark corresponding to the corresponding air bag. Under this structure, be convenient for operation and adjustment.

In the same way, the air bags with the same pressure requirement can be inflated/deflated by adopting the same air pipe according to the characteristics of the core.

The device has the advantages and beneficial effects that: the device can greatly save the workload of the production process, reduce the production working hours, improve the working efficiency, improve the quality stability and avoid sand inclusion defects and dimensional deviation. The device has simple structure and convenient operation.

Drawings

FIG. 1 is a schematic view of the internal structure (cross section) of the present embodiment;

FIG. 2 is a schematic view of the inflation/deflation structure of the trachea in the present embodiment;

in the figure: the casting sand molding device comprises molding sand 1, a combined type mold core 2, a mold cavity 3, a mold core seat 4, a unit mold core 5, an air bag 6, an air pipe 7, a first air pipe channel 8, a second air pipe channel 9, a three-way air valve 10, a one-way air valve 11, a parting surface 12, a chill 13 and a sand box 14.

Detailed Description

The utility model is further described with reference to the following figures and detailed description.

Referring to fig. 1, an inter-core positioning structure for a large casting mold clamping process includes a flask 14, molding sand 1, and a combined core 2; the molding sand 1 is arranged in the sand box 14, and a cavity formed by the molding sand forms a cavity 3 for molding a casting; the combined type mold core 2 is arranged in the mold cavity 3 through a mold core seat 4; the combined core 2 is composed of a plurality of unit cores 5, and adjacent unit cores are separated by gap blocks.

The gap cushion block is an air bag 6; the air bag 6 is connected with an air pipe 7, and an air valve is connected on the air pipe; the air pipe 7 is arranged in the air pipe channel; the air pipe channel has two parts, the first air pipe channel 8 is in the clearance between the unit cores 2, and the second air pipe channel 9 is embedded in the molding sand; one end of the second air pipe channel 9 corresponds to the position of the core print seat, and the other end of the second air pipe channel 9 is arranged on the side wall of the sand box; the air valves are external to the sand box 14.

With further reference to fig. 2, in use, the air valve is a three-way air valve 10, and three ends of the three-way air valve 10 are respectively connected with an air pipe 7, an air source and the atmosphere; the air pipe is respectively communicated with an air source and the atmosphere through a valve; one end of the three-way air valve connected with the air source is connected with a one-way air valve 11. In the field, the air source is a public high-pressure air source in the production field, a pipeline of the public high-pressure air source is connected with an inflation gun, and the inflation gun adjusts the air pressure of the air bag 7 through a one-way air valve 11 and a three-way air valve 10.

Referring to fig. 1, in this example, the second air duct 9 comprises a vertical section and a horizontal section, the vertical section of the second air duct is directly below the core print 4, and the horizontal section of the second air duct is far away from the cavity portion.

The sand box 14 is divided into a plurality of sand boxes, and the sand boxes are sequentially spliced along a parting plane. This example is a typical two flask configuration with the cope and drag flasks joined along a parting plane.

According to the requirement, a chilling block 13 can be further included; the chills 13 are in the sectional cores 2 and the gap blocks between the chills and the adjacent cell cores are air pockets.

In this example, the unit cores are sand cores made of molding sand.

Each air bag is correspondingly connected with an air pipe, and the air pipe and the air valve are provided with marks corresponding to the corresponding air bags, such as the number of the air bags.

The gap cushion block in the embodiment adopts a high-strength TPU rubber air bag, the air bag has the design of bearing 400 kilograms per 15 square centimeters, and the number of the air bags can be matched according to the size of the sand core. Because the air bag applies force to the adjacent unit cores in a bulging mode instead of fastening the adjacent unit cores in a wedge-shaped cushion block mode, the phenomenon of core friction does not occur.

Claims

1. A positioning structure between sand cores for a large casting die assembly process comprises a sand box, molding sand and a combined type core; molding sand is arranged in the sand box, and a cavity formed by the molding sand forms a cavity for molding a casting; the combined type mold core is arranged in the mold cavity through the mold core seat; the combined type mold core is composed of a plurality of unit mold cores, and adjacent unit mold cores are separated by gap cushion blocks; the air bag is connected with an air pipe, and an air valve is connected on the air pipe; the trachea is in the trachea channel; the air pipe channel has two parts, the first air pipe channel is in the gap between the unit mold cores, and the second air pipe channel is embedded in the molding sand; one end of the second air pipe channel is positioned corresponding to the core print seat, and the other end of the second air pipe channel is positioned on the side wall of the sand box; the air valve is arranged outside the sand box.

2. The positioning structure between sand cores for the die assembly process of the large casting according to claim 1, wherein the air valve is a three-way air valve, and three ends of the three-way air valve are respectively connected with an air pipe, an air source and the atmosphere; the air pipe is respectively communicated with an air source and the atmosphere through a valve; one end of the three-way air valve connected with the air source is connected with a one-way air valve.

3. The positioning structure between sand cores for the die assembly process of large castings according to claim 1, wherein the second air duct includes a vertical section and a horizontal section, the vertical section of the second air duct is directly below the core print, and the horizontal section of the second air duct is far away from the cavity portion.

4. The positioning structure for the sand cores in the mold closing process of large castings according to claim 1, wherein the sand box is divided into a plurality of sand boxes, and the sand boxes are sequentially spliced along the parting plane.

5. The positioning structure between sand cores for a large casting mold closing process according to claim 1, further comprising a chill; the chiller is in the combined type mold core, and the gap cushion block between the chiller and the adjacent unit mold core is an air bag.

6. The inter-core positioning structure for a large casting clamping process according to claim 1, wherein the unit cores are cores made of sand.

7. The positioning structure between sand cores for the mold closing process of large castings according to claim 1, wherein each air bag is connected with an air pipe, and the air valve of the air pipe is provided with a mark corresponding to the corresponding air bag.