Multi-insert casting capable of preventing generation of solidification shrinkage hindered cracks

Abstract

The utility model discloses a multi-insert casting capable of preventing generation of solidification shrinkage hindered cracks, which is characterized in that a smaller basic unit is designed and consists of an insert and metal coated outside the insert, when the basic unit is independently cast, the size is smaller, and the solidification shrinkage hindered cracks cannot be generated, so that the casting is designed to be formed by overlapping a plurality of basic units; before the casting is poured, the inserts are relatively fixed by the connecting rods and the positioning plates, when molten metal is solidified and contracted, the fixation between the inserts and the positioning plates is eliminated, the inserts can move along with contracted metal, and the problem that the larger the sizes of the inserts of the casting are, the easier the generation of cracks due to contraction and solidification blocking is solved.

Description

Technical Field

[0001] The utility model relates to metal castings, in particular to a multi-insert casting for preventing the generation of cracks caused by blocked solidification shrinkage. Background Technique

[0002] When the solidification shrinkage of a metal casting encounters obstacles such as cores and inserts and cannot shrink freely, stress or strain exceeding the fracture strength or fracture strain of the metal at that temperature will be generated, that is, cracks will be generated. The larger the size of the core and insert, the easier it is to generate cracks. Therefore, it is very difficult to control cracks in large-size cores and inserts in large-size castings, which affects the application of such castings. Content of the Utility Model

[0003] In order to solve the above problems, the utility model provides a multi-insert casting for preventing the generation of cracks caused by blocked solidification shrinkage, which can effectively solve the deficiencies in the prior art.

[0004] The utility model is realized through the following technical solutions: A multi-insert casting for preventing the generation of cracks caused by blocked solidification shrinkage, the casting is composed of at least two basic units stacked together, the basic unit is composed of an insert and the metal coated outside it, and no cracks caused by blocked solidification shrinkage will be generated when the basic unit is cast alone.

[0005] As a preferred technical solution, the insert is a weight-reducing function insert, and the weight-reducing insert material can be a sand core or dehydrated wood or rock wool.

[0006] The utility model is realized through the following technical solutions: A multi-insert casting for preventing the generation of cracks caused by blocked solidification shrinkage, before pouring, each insert is relatively fixed by a connecting rod and a positioning plate. When the molten metal solidifies and shrinks, the fixation between the insert and the positioning plate is eliminated, and each insert can move with the shrinking metal.

[0007] As a preferred technical solution, the insert, the connecting rod and the connecting plate form an insert unit, and there is a pressing and loosening mechanism on the positioning plate, which can make the insert unit and the positioning plate have two states of fixation and elimination of fixation.

[0008] The utility model is realized through the following technical solutions: A multi-insert casting for preventing the generation of cracks caused by blocked solidification shrinkage, each insert is relatively fixed by a connecting rod and a positioning plate, the connecting rod is an elastic rod or a spring, and each insert can move with the solidifying and shrinking metal after pouring the molten metal.

[0009] The beneficial effects of the present utility model are as follows: The present utility model designs a relatively small basic unit, which consists of an insert and the metal coating its outside. When the basic unit is cast alone, due to its small size, no blocked cracks caused by solidification shrinkage will occur. The casting is designed to be composed of several superimposed basic units. Before the casting is poured, each insert is relatively fixed by a connecting rod and a positioning plate. When the molten metal solidifies and shrinks, the fixation between each insert and the positioning plate is eliminated, and each insert can move with the shrinking metal, solving the problem that the larger the size of the insert in the casting, the more likely it is to cause blocked cracks due to shrinkage and solidification. Brief Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 Schematic diagram of the metal casting with a weight-reducing insert of the present utility model;

[0012] Figure 2 Side view of the metal casting with a weight-reducing casting of the present utility model;

[0013] Figure 3 Schematic diagram of the insert with a connecting rod of the present utility model;

[0014] Figure 4 Schematic diagram of the insert with a connecting rod and a connecting plate of the present utility model;

[0015] Figure 5 Schematic diagram of the relationship between the positioning plate and the insert assembly of the present utility model;

[0016] Figure 6 Schematic diagram of the positioning plate pressing the insert assembly of the present utility model;

[0017] Figure 7 Schematic diagram of the positioning plate and the insert assembly releasing the pressing of the present utility model;

[0018] Figure 8 Schematic diagram of the position of the mold, the positioning plate and the insert assembly of the present utility model;

[0019] Figure 9 Schematic diagram of the position of the mold, the positioning plate and the insert assembly after pouring molten metal of the present utility model;

[0020] Figure 10 Schematic diagram of the position of the mold, the elastic connecting rod and the positioning plate of the present utility model;

[0021] Figure 11 Schematic diagram of the positions of the casting mold, elastic connecting rod and positioning plate of the present utility model after pouring molten metal;

[0022] Figure 12 Schematic diagram of the insert with reinforcing rib grooves and reinforcing holes in the middle of the present utility model

[0023] Figure 13 Cross-sectional view of the insert with reinforcing rib grooves and reinforcing holes in the middle of the present utility model;

[0024] Figure 14 Schematic diagram of the insert with reinforcing rib grooves and reinforcing holes in the middle of the present utility model with a connecting rod; Description of the drawings:

[0026] 1. Cast metal part; 101. Basic unit that will not generate casting cracks; 2. Weight-reducing insert; 201. Insert with reinforcing rib grooves and reinforcing rod holes; 2011. Reinforcing rod hole; 2012. Reinforcing rib groove; 3. Connecting rod; 31. Connecting plate; 301. Remaining part of the connecting rod in the casting; 302. Elastic connecting rod; 4. Positioning plate; 401. Positioning plate for the elastic connecting rod; 5. Cylinder; 6. Pull rod; 7. Pressing plate; 8. Casting mold; Detailed implementation manners

[0027] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0028] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end portion", "length", "outer end", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0030] In addition, in the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0031] Spatial relative position terms used in the present utility model, such as "upper", "above", "lower", "below", etc., are for the purpose of facilitating description to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The spatial relative position terms may be intended to include different orientations of the device during use or operation other than the orientations shown in the figures. For example, if the device in the figure is flipped, the unit described as being "below" or "beneath" other units or features will be located "above" other units or features. Therefore, the exemplary term "below" can encompass both the upper and lower orientations. The device can be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptive terms used herein can be interpreted accordingly.

[0032] In the present utility model, unless otherwise clearly specified and defined, terms such as "set", "socketed", "connected", "penetrated", "plugged", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] Embodiment 1

[0034] Figure 1 It is a cast aluminum alloy door panel. The small solid-line frame contains the basic unit 101 that will not generate casting cracks, and the single-piece insert therein is a weight-reducing insert 2. After separate casting experiments, because of its small size, it will not generate casting cracks. Then, taking this as the basic unit, multiple metal castings of weight-reducing inserts 2 with 6 groups in length and 3 groups in width are spliced. In this embodiment, the outer dimension of the basic unit is 310mm * 310mm, the dimension of the weight-reducing insert 2 is 300mm * 300mm. After splicing, the length is 6 * 310 = 1860mm, the width is 3 * 310 = 930mm, the thickness of the outer shape is 80mm, the thickness of the weight-reducing insert is 65mm, and the final outer dimension is 1860mm * 930mm * 80mm, containing 18 independent weight-reducing inserts 2. The insert is made of resin sand, the connecting rod is an aluminum rod with a diameter of 15mm, the casting metal is aluminum, and the weight-reducing insert 2 can also be replaced by dehydrated wood or rock wool.

[0035] Embodiment 2

[0036] Different from Embodiment 1, it is as shown in the casting process Figures 3 - 5 shown Figure 3 It is composed of a weight-reducing insert 2 and a connecting rod 3 Figure 4 It is in Figure 3On the basis of this, a connecting plate 31 is added to form an insert assembly. Figure 5 It is a position relationship diagram of the positioning plate 4 and the weight-reducing insert 2 assembly. Figure 6 This is the state where the weight-reducing insert 2 is pressed tightly on the positioning plate 4. There is a cylinder 5 or an oil cylinder on the upper part of the positioning plate 4. The piston is connected to the connecting rod 5. There is a pressing plate 7 at the head of the pull rod 6. In the figure, it is the state where the pressing plate 7 presses the connecting plate 31 on the positioning plate 4. Figure 7 This is the state where the connecting plate 31 and the positioning plate 4 are released from the pressed state. The pressing plate 7 leaves the connecting plate 31, so that the weight-reducing insert 2 assembly can be unrestricted by the original pressed position. The casting process is as Figure 8 and Figure 9 shown. Figure 8 There is a casting mold 8 in it, which is the lower mold. Above it are the positioning plate 4 and several weight-reducing inserts 2 pressed on the positioning plate 4. For the pressed state, refer to Figure 6 . Figure 9 This is the state after the molten metal is injected. After the molten metal is injected, the cylinder 5 or the oil cylinder on the positioning plate 4 is loosened to eliminate the positioning of each weight-reducing insert 2 and the positioning plate 4. The released state is as Figure 7 shown. At this time, the molten metal begins to solidify and shrink. Since each weight-reducing insert 2 is immersed in the molten metal, during the solidification and shrinkage of the molten metal, the pressing and positioning between each weight-reducing insert 2 and the connecting plate 4 are eliminated, so that it can move freely with the solidification and shrinkage of the molten metal. After solidification is completed, the connecting rod 3 exposed on the metal casting is cut off, and the remaining part of the connecting rod in the casting forms an integral body with the casting.

[0037] Embodiment 3

[0038] The difference from Embodiment 2 is that, as Figure 10 and Figure 11 shown, the difference from Embodiment 2 is that the elastic connecting rod 302 is directly pressed on the positioning plate 401 for the elastic connecting rod. Figure 10 This is the state before the molten metal is poured. Figure 11 This is after the molten metal is injected. When the molten metal solidifies and shrinks, each weight-reducing insert 2 is fixed and pressed on the positioning plate 401 for the elastic connecting rod by the elastic connecting rod 302. The elastic connecting rod 302 can swing in the horizontal direction to adapt to the solidification and shrinkage of the molten metal. This embodiment is applicable to the occasions where the weight-reducing insert needs to move a small distance.

[0039] Embodiment 4

[0040] The difference from the above embodiments is that the weight-reducing insert 2 is as Figure 12 shown. On the insert 201 with a reinforcing rib groove and a reinforcing rod hole, the weight-reducing insert has several through-hole reinforcing rod holes 2011 and deep groove reinforcing rib grooves 2012, which are formed after the molten metal is poured and solidified, and are connected to the two-sided connecting columns and the metal internal reinforcing ribs. Figure 13 This is a sectional view of the insert 201 with a reinforcing rib groove and a reinforcing rod hole.Figure 14 It is a diagram of an insert 201 and a connecting rod component with a reinforcing rib groove and a reinforcing rod hole.

[0041] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope defined in the claims.

Claims

1. A multi-insert casting for preventing solidification shrinkage hindered cracks, characterized in that: The casting is composed of at least two basic units stacked together, and the basic unit is composed of an insert and a metal covering the outside thereof. When the basic unit is cast alone, no solidification shrinkage hindered cracks will be generated; The insert, the connecting rod and the connecting plate form an insert unit. The positioning plate is provided with a pressing and releasing mechanism to enable the insert unit and the positioning plate to have two states: fixed and unfixed. Each insert is relatively fixed by a connecting rod and a positioning plate. The connecting rod is an elastic rod or a spring. After pouring the molten metal, each insert can move with the solidified and contracted metal.

2. The multi-insert casting for preventing solidification shrinkage hindered cracks according to claim 1, characterized in that: The insert is a weight-reducing functional insert, and the weight-reducing insert material can be a sand core or dehydrated wood or rock wool.

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