CN216938304U - Positioning structure between sand cores for mold clamping process of large castings - Google Patents

Abstract

A positioning structure between sand cores used in the mold clamping process of large-scale castings, including a sand box, molding sand and a combined core; The core seat is installed in the cavity; the combined core is composed of a plurality of unit cores, and the adjacent unit cores are separated by gap spacers. The gap block is an airbag; the airbag is connected with a trachea, and the trachea is connected with an air valve; the trachea is in the tracheal channel; the tracheal channel has two parts, the first tracheal channel is in the gap between the unit cores, and the second tracheal channel is embedded in the The position of one end of the second air pipe channel corresponds to the position of the core seat, and the other end of the second air pipe channel is on the side wall of the flask; the air valve is outside the flask. The device can greatly save the workload of the production process, reduce the production time, improve the work efficiency, improve the quality stability, and avoid sand inclusion defects and dimensional deviations.

Description

Positioning structure between sand cores for mold clamping process of large castings

technical field

The utility model relates to the technical field of casting production, in particular to a core fixing structure used in a mold clamping process for large-scale castings.

Background technique

In the fran resin sand molding method for extra-large castings, many products need to be matched with different numbers of large-sized sand cores (also known as mud cores, which are a type of cores). For extra-large products such as wind power shells, which are large in size and complex in structure, mud core combination (core forming) is a common process. In the process of core molding (combining multiple sand cores to form a mold), the positioning of the sand cores is particularly important. Usually, the small sand cores are inserted into the small sand cores by means of soft fixing materials, such as foam pads, soft pads and other gap pads. (also known as block) gap as a support and adjustment position. This method often causes friction between the fixed material and the sand core, causing the sand particles to fall into the cavity. The cavity needs to be cleaned repeatedly, which is time-consuming and labor-intensive. If the cleaning is not thorough, it is easy to cause the defect of sand inclusion in the casting. At the same time, this method is not reliable. During the process of sand core positioning and box turning, the sand core will be deviated, resulting in poor size, or the positioning pad will fall into the cavity and be difficult to take out, so that the sand box must be turned back again. Only when the sand core is taken out can the pads be taken out, and all processes are re-operated, resulting in a huge waste of manpower, material resources, time, station consumption, and equipment waiting.

For example, Chinese patent 2016210948594, a sand box with a mud core, which locates the mud core through a relatively complex fixing structure. The mud core fixing structure has strong limitations in use, and the position of the mud core for modeling needs to be close to the lid of the sand box.

SUMMARY OF THE INVENTION

For the above-mentioned difficulties, the present invention proposes a fixed structure between sand cores with strong versatility, which can be suitable for positioning between cores under various position structures.

A positioning structure between sand cores used in the mold clamping process of large-scale castings, comprising a sand box, molding sand and a combined core; The core seat is installed in the cavity; the combined core is composed of a plurality of unit cores, and the adjacent unit cores are separated by gap spacers.

The gap spacer is an airbag; the airbag is connected with a trachea, and the trachea is connected with an air valve; the trachea is in the tracheal channel; the tracheal channel has two parts, the first tracheal channel is in the gap between the unit cores, and the second tracheal channel It is embedded in the molding sand; the position of one end of the second air pipe channel corresponds to the position of the core seat, and the other end of the second air pipe channel is on the side wall of the flask; the air valve is outside the flask.

The positioning structure adopts an airbag to replace the foam pads, soft pads, etc. in the prior art as the gap pads. The inflatable air bag is applied, and the amount of inflation can be adjusted according to the position of the unit sand core to be fixed, and the position of the lower core can be fixed. The structure can avoid the quality problem of sand wiping caused by the plug.

The air pipe is placed through the gap between the unit cores, the core seat and the air pipe channel in the flask, avoiding the influence on the cavity. The second gas pipe channel can also play the role of dispersing the exhaust gas in the molding sand during the casting process.

Further: the gas valve is a three-vent valve, and the three ends of the three-vent valve are respectively connected with the gas pipe, the gas source and the atmosphere; through the valve, the gas pipe is respectively connected/closed with the gas source and the atmosphere; the three-vent valve is connected with the gas source. One end is connected with a one-way air valve. With this structure, it is convenient to use on-site and adjust the air pressure and the like. When adjusting the air pressure, you can refer to the value on the inflation gun.

Further: the second tracheal channel includes a vertical section and a horizontal section, the vertical section of the second tracheal channel is directly below the core seat, and the horizontal section of the second tracheal channel is away from the cavity part. With this structure, the second trachea is kept away from the cavity as much as possible, so as to avoid a negative impact on the structural strength of the cavity.

Further: the sand box is divided into multiple, and each sand box is spliced along the parting surface. The utility model can be applied to various sand box structures, such as a single box, two boxes, three boxes and the like.

Further: cold iron is also included; the cold iron is in the combined core, and the gap spacer between the cold iron and the adjacent unit core is an air bag. Under this structure, the casting shrinkage and directional solidification can be controlled at specific positions by placing chilled iron at specific positions of the core. The air bag can also assist in positioning the cold iron.

Further: the unit core is a sand core made of molding sand. The unit core can also be a core of other materials.

Further: each air bag is correspondingly connected to a trachea, and the trachea and the air valve have a mark corresponding to the corresponding air bag. With this structure, it is easy to operate and adjust.

Similarly, according to the characteristics of the core itself, the same air tube can be used to inflate/deflate the airbags with the same pressure requirements.

The advantages and beneficial effects of the device are as follows: the device can greatly save the workload of the production process, reduce the production man-hours, improve the work efficiency, improve the quality stability, and avoid sand inclusion defects and dimensional deviations. The device has a simple structure and is convenient to operate.

Description of drawings

Fig. 1 is the internal structure (section) schematic diagram of this embodiment;

2 is a schematic diagram of a tracheal inflation and deflation structure of the present embodiment;

In the figure: molding sand 1, combined core 2, cavity 3, core seat 4, unit core 5, air bag 6, trachea 7, first tracheal channel 8, second tracheal channel 9, three-vent valve 10, single To the air valve 11, the parting surface 12, the cold iron 13, the flask 14.

Detailed ways

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

Referring to FIG. 1, a positioning structure between sand cores for large-scale casting mold clamping process includes a sand box 14, molding sand 1 and a combined core 2; the molding sand 1 is in the sand box 14, and the cavity enclosed by the molding sand constitutes the casting. The formed cavity 3; the combined core 2 is installed in the cavity 3 through the core seat 4; the combined core 2 is composed of a plurality of unit cores 5, and the adjacent unit cores are separated by gap spacers. open.

The gap spacer is an airbag 6; the airbag 6 is connected with a trachea 7, and the trachea is connected with an air valve; the trachea 7 is in the tracheal channel; the tracheal channel has two parts, and the first tracheal channel 8 is in the gap between the unit cores 2 Inside, the second air pipe channel 9 is embedded in the molding sand; the position of one end of the second air pipe channel 9 corresponds to the position of the core seat, and the other end of the second air pipe channel 9 is on the side wall of the sand box; the air valve is in the sand Box 14 outside.

With further reference to Fig. 2, when in use, the air valve is a three-vent valve 10, and the three ends of the three-vent valve 10 are respectively connected to the air pipe 7, the air source and the atmosphere; Through the valve, the air pipe is communicated/closed with the air source and the atmosphere respectively; A one-way air valve 11 is connected to one end of the three-vent valve that is connected to the air source. On site, the gas source is the public high-pressure gas source at the production site, and the pipeline of the public high-pressure gas source is connected to the air gun, which adjusts the air pressure of the air bag 7 through the one-way air valve 11 and the three-vent valve 10.

Referring to FIG. 1 , in this example, the second gas pipe channel 9 includes a vertical section and a horizontal section, the vertical section of the second gas pipe channel is directly below the core seat 4 , and the horizontal section of the second gas pipe channel is away from the cavity part.

The flasks 14 are divided into multiples, and each flask is spliced in sequence along the parting surface. This example is a typical structure of two flasks, the upper and lower flasks are spliced along the parting surface.

As required, the cold iron 13 can also be included; the cold iron 13 is in the combined core 2, and the spacer block between the cold iron and the adjacent unit cores is an air bag.

In this example, the unit core is a sand core made of molding sand.

Each air bag is correspondingly connected to a trachea, and the trachea and the air valve have an identification corresponding to the corresponding air bag, such as the number number of the air bag, and the like.

The gap spacer in this example uses high-strength TPU rubber airbags, which are designed to bear 400 kg per 15 square centimeters, and can match the number of airbags according to the size of the sand core. Since the airbag exerts force on the adjacent unit cores in the form of bulging, rather than tightening the adjacent unit cores by plugging the wedge-shaped spacers, the friction core phenomenon will not occur.

Claims (7)

1. A positioning structure between sand cores used in the mold clamping process of large-scale castings, including a sand box, molding sand and a combined core; the molding sand is in the sand box, and the cavity enclosed by the molding sand constitutes the cavity for forming the casting; the combined type The core is installed in the cavity through the core seat; the combined core is composed of a plurality of unit cores, and the adjacent unit cores are separated by a gap pad, which is characterized in that the gap pad is an airbag; The air bag is connected with a trachea, and the trachea is connected with an air valve; the trachea is in the trachea channel; the trachea channel has two parts, the first trachea channel is in the gap between the unit cores, and the second trachea channel is embedded in the molding sand; the second trachea channel The position of one end of the channel corresponds to the position of the core seat, and the other end of the second air pipe channel is on the side wall of the flask; the air valve is outside the flask. 2. The positioning structure between sand cores for large-scale casting mold clamping operation according to claim 1, characterized in that the air valve is a three-vent valve, and the three ends of the three-vent valve are respectively connected to a trachea, an air source and the atmosphere; Through the valve, the air pipe is connected/closed with the air source and the atmosphere respectively; a one-way air valve is connected to one end of the three-ventilation valve which is connected to the air source. 3. The positioning structure between sand cores for large-scale casting mold clamping process according to claim 1, characterized in that the second gas pipe channel comprises a vertical section and a horizontal section, and the vertical section of the second gas pipe channel is in the core seat Just below, the horizontal section of the second tracheal channel is away from the cavity part. 4 . The positioning structure between sand cores for large-scale casting mold clamping process according to claim 1 , wherein the sand boxes are divided into a plurality of boxes, and each sand box is sequentially spliced along the parting surface. 5 . 5. The positioning structure between sand cores for large-scale casting mold clamping process according to claim 1, characterized in that it further comprises cold iron; The space between the spacers is the air bag. 6 . The positioning structure between sand cores according to claim 1 , wherein the unit core is a sand core made of molding sand. 7 . 7. The positioning structure between sand cores for large-scale casting mold clamping process according to claim 1 is characterized in that each air bag is correspondingly connected to a trachea, and the air valve of this trachea has a sign corresponding to the corresponding air bag .

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