Cold and hot combined core making device

Abstract

The utility model discloses a cold and hot combined core making device which comprises a hot core box and a cold core box, the hot core box is matched with the first mold core, the cold core box is matched with the second mold core, the hot core box is connected with the cold core box, and the first mold core and the second mold core are of an integrally formed structure. Compared with a traditional core assembly process, the sand core is integrally formed, core assembly gap errors do not exist, sand core exhaust is smoother, the size and position precision of an oil duct is improved, the problems of air hole defects and fin seams of castings are avoided, the internal and external quality of the castings is fundamentally improved, and the percent of pass of the castings is greatly improved. And compared with a core assembly process, the forming process is more reliable and stable, influence factors such as infirm core assembly and sand core looseness do not exist, and therefore the core assembly cost and the fin cleaning cost are saved.

Description

Technical Field

[0001] The utility model belongs to the field of low-pressure casting, in particular to a cold-hot combined core making device. Background Art

[0002] Low-pressure casting is an anti-gravity casting method, which means that liquid metal fills the mold cavity and solidifies into shape against the direction of gravity under the action of external force. When low-pressure castings have complex oil channels, sand core molding is required. In order to improve the surface finish and strength of the oil channel core, a hot core box is required to mold the oil channel core. In order to ensure the size and position accuracy of the oil channel, a positioning core needs to be set to complete the positioning requirements of the oil channel core in the casting mold; when the casting has two or more oil channels, the traditional process often requires core assembly, that is, each oil channel core and positioning core are bonded and combined with a special adhesive.

[0003] In practice, the core assembly process has the following problems:

[0004] Since the sand cores of the core assembly need to be matched with each other, there is a large error, which reduces the size and position accuracy of the oil channel;

[0005] As the core box is seriously worn during use, the gaps between the sand cores become larger, and cracks are generated inside the oil channel of the casting during the pouring process. Special positions cannot even be cleaned. The cracks cannot be cleaned or are missed, which leads to the scrapping of castings and reduces the qualified rate of castings.

[0006] Since each sand core is separate, the exhaust passage between the sand cores is not smooth, and the adhesive itself will also emit gas, so there will be porosity defects in the casting near the sand core, resulting in the scrapping of the casting and reducing the qualified rate of the casting;

[0007] During the core assembly process, the core assembly is not firm and the sand cores are loose, which reduces the stability of the core making process;

[0008] The assembly of each sand core and the cleaning of the seams of castings will increase labor costs. Utility Model Content

[0009] The utility model aims to provide a cold-hot combined core making device to solve the problems of low size and position accuracy of oil passages and low casting qualification rate in the existing core assembly process.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] A hot and cold combined core making device, comprising a hot core box and a cold core box;

[0012] The hot core box matches the first core, the cold core box matches the second core, the hot core box and the cold core box are connected, and the first core and the second core are an integrally formed structure.

[0013] Furthermore, the first core is an oil channel core.

[0014] Furthermore, the second core is a positioning core.

[0015] Furthermore, the oil channel core and the positioning core are integrally formed into an integral sand core.

[0016] Furthermore, the hot core box is provided with YD-D type high-strength coated sand.

[0017] Furthermore, positioning points are arranged in the cold box.

[0018] Furthermore, the material of the positioning points is elastic material.

[0019] Furthermore, a loose block is provided on the cold core box, and the loose block is used to press the oil channel core.

[0020] Furthermore, a core pulling device is provided on one side of the cold core box.

[0021] Furthermore, the core pulling device is connected to a cylinder.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The utility model provides a hot and cold combined core making device, which forms an integral sand core through the integral molding of a hot core box and a cold core box, and the oil channel core is molded by the hot core box, so that the size and position accuracy of the oil channel are improved. Compared with the traditional core assembly process, the sand core is integrally formed, there is no core assembly gap error, the sand core exhaust is smoother, and the air hole defects and seam problems of the casting are avoided, which fundamentally improves the internal and external quality of the casting and greatly improves the qualified rate of the casting. And it is more reliable and stable than the core assembly process, without the influencing factors such as loose core assembly and loose sand core, thereby saving the cost of core assembly and seam cleaning. At the same time, the hot and cold combined core making device of the utility model has a core making service life of up to 100,000 times, which provides a new method and new idea for the preparation of complex sand cores, reduces the influence of human factors in core making, improves the degree of automation, and accumulates relevant experience for the innovation and development of core making technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall sand core of the utility model.

[0026] Figure 2 It is a schematic diagram of the hot core box of the utility model.

[0027] Figure 3 It is a schematic diagram of a cold core box of the present utility model.

[0028] Among them: 1- oil channel core, 2- positioning core, 3- integral sand core, 4- hot core box, 5- cold core box, 6- elastic material, 7- loose block, 8- core pulling, 9- cylinder;

[0029] Figure 3 In the figure, (a) is a schematic diagram of one side of the cold core box, and (b) is a schematic diagram of the other side of the cold core box. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] The utility model is further described in detail below with reference to the accompanying drawings:

[0037] See also Figure 1 The utility model provides a hot and cold combined core making device, comprising a hot core box 4, a cold core box 5, an elastic material 6, a movable block 7, a core pulling 8 and a cylinder 9.

[0038] The hot core box 4 matches the oil channel core 1, and the cold core box 5 matches the positioning core 2. The hot core box 4 and the cold core box 5 are connected so that the oil channel core 1 and the positioning core 2 can form an integral molding structure. The oil channel core 1 and the positioning core 2 are integrally molded to form an integral sand core 3, and the positioning core 2 ensures that the oil channel core 1 is reliably positioned in the casting mold. The oil channel core 1 is molded by the hot core box 4, which improves the size and position accuracy of the oil channel.

[0039] The oil channel core 1 is formed by the hot core box 4, and the hot core box 4 is provided with YD-D type high-strength coated sand to ensure the strength of the oil channel core 1 and avoid oil channel core breakage. The oil channel core 1 is placed in the cold core box 5, and the positioning core 2 is formed by the cold core box 5 to complete the molding of the integral sand core 3. The integral sand core 3 is set as an anti-rotation and anti-detachment structure to ensure the firm combination of the hot and cold core sands. The integrally formed integral sand core 3 has no core assembly gap error, and the sand core exhaust is smoother, which avoids the pore defects and seam problems of the casting, fundamentally improves the internal and external quality of the casting, and greatly improves the qualified rate of the casting. It is more reliable and stable than the core assembly process, without the influencing factors such as loose core assembly and loose sand core, saving the cost of core assembly and seam cleaning.

[0040] A positioning point is provided in the cold core box 5, and the oil channel core 1 is placed in the cold core box 5 according to the positioning point. The material of the positioning point is an elastic material 6, such as rubber, to prevent the oil channel core 1 from being crushed. A loose block 7 is provided on the cold core box 5. After the oil channel core 1 is placed, the loose block 7 is used to press the oil channel core 1 to ensure that the oil channel core 1 is accurately positioned.

[0041] A core puller 8 is provided on one side of the cold core box 5, and the core puller 8 is connected to a cylinder 9. For a part that cannot be demoulded normally, the cylinder 9 is used as a power, and the core puller 8 is adopted to demould the whole sand core 3 normally.

[0042] The utility model replaces the traditional core assembly process by completing the integral forming of a complex oil channel sand core. The oil channel core 1 is first made through a hot core box 4, and then placed in a cold core box 5 for secondary core making to make a positioning core 2. The positioning core 2 and the oil channel core 1 are integrally formed to form an integral sand core 3, thereby completing the forming of the integral sand core 3.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hot and cold combined core making device, characterized in that: It comprises a hot core box (4) and a cold core box (5); The hot core box (4) matches the first core, the cold core box (5) matches the second core, the hot core box (4) and the cold core box (5) are connected, and the first core and the second core are an integrally formed structure.

2. A hot and cold combined core making device according to claim 1, characterized in that: The first core is an oil channel core (1).

3. A hot and cold combined core making device according to claim 2, characterized in that: The second core is a positioning core (2).

4. A hot and cold combined core making device according to claim 3, characterized in that: The oil channel core (1) and the positioning core (2) are integrally formed to form an integral sand core (3).

5. A hot and cold combined core making device according to claim 1, characterized in that: The hot core box (4) is provided with YD-D type high-strength coated sand.

6. A hot and cold combined core making device according to claim 1, characterized in that: Positioning points are arranged in the cold box (5).

7. A hot and cold combined core making device according to claim 6, characterized in that: The material of the positioning points is elastic material (6).

8. A hot and cold combined core making device according to claim 1, characterized in that: The cold core box (5) is provided with a movable block (7), and the movable block (7) is used to press the oil channel core (1).

9. A hot and cold combined core making device according to claim 1, characterized in that: A core pulling device (8) is provided on one side of the cold core box (5).

10. A hot and cold combined core making device according to claim 9, characterized in that: The core pulling (8) is connected to the cylinder (9).

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