Novel point cooling device and casting mold

Abstract

The novel point cooling device comprises a point cooling head, a water conveying ring and a water conveying pipe, a water conveying ring mounting hole, a necking hole and a water return hole are formed in the point cooling head in a mutually communicated mode, a water inlet port and a water outlet port are formed in the peripheral wall of the point cooling head and used for mounting a water inlet and a water outlet respectively, and the water inlet port and the water outlet port are communicated with the water conveying ring mounting hole and the water return hole respectively. The water conveying ring is formed into a cylinder with a hollow blind hole part, the peripheral surface of the cylinder comprises a matching surface I and a matching surface II which are matched with the water conveying ring mounting hole, a water inlet hole is formed in a concave part between the matching surface I and the matching surface II, and the water inlet hole communicates the water inlet with the hollow blind hole part of the water conveying ring. And a water conveying pipe mounting hole processed at the bottom of the water conveying ring forms an opening part of the hollow blind hole part and is used for assembling a water conveying pipe. The casting mold comprises the water cooling hole formed in the area needing to be cooled and the point cooling device installed in the water cooling hole through the third double nipple, and therefore the casting mold is simple in structure, low in manufacturing cost and high in stability.

Description

Technical Field

[0001] The utility model relates to aluminum alloy, magnesium alloy differential, low-pressure casting mold technology, and more specifically to a novel spot cooling device and casting mold which has simple structure, low manufacturing cost, high stability and can accurately control the mold temperature. Background Art

[0002] In the casting production process, the temperature of the mold plays a key role in the appearance and internal quality of the casting. During the die casting process, the casting follows the step cooling, from the far end of the casting to the center of the riser, and gradually cools and solidifies in sequence. The mold is hot where it should be hot, and cool where it should be cool. Only after the mold temperature is balanced can the casting with uniform internal structure, good quality and good appearance be produced. In order to achieve mold temperature balance and accurately control the mold temperature, a spot cooling device is required.

[0003] The traditional spot cooling device is divided into three parts: the spot cooling joint, the intermediate water transport pipe, the thread, the mold body opening, and the installation of the spot cooling device. The principle is that cooling water enters from the water inlet of the spot cooling device, the depth of the cold water is controlled by the length of the intermediate pipe, and the water returns from the gap between the mold hole and the intermediate water transport pipe. Finally, water is discharged from the water outlet of the spot cooling device, thereby realizing single-point local water circulation and achieving the purpose of local cooling.

[0004] The disadvantage of the traditional spot cooling device is that the middle water pipe is easy to fall off. The middle water pipe is threadedly connected to the spot cooling joint. In production and use, under the impact of water flow and rust, the middle water pipe is easy to fall off. After the middle water pipe falls off, the cooling water flows directly from the water inlet to the water outlet. The cooling water cannot circulate to the desired cooling part, resulting in failure of spot cooling, excessive mold temperature, and insufficient cooling, which eventually leads to quality problems such as internal shrinkage of the casting and aluminum sticking on the surface. It also affects the production rhythm and cannot be produced normally. In addition, the mold maintenance cycle and difficulty are increased, because the middle water pipe cannot be found without disassembling the spot cooling device. Because it is installed inside the spot cooling device, the differential pressure mold has multiple cavities (four cavities, six cavities, eight cavities), and there are 60-120 spot cooling devices. During maintenance, all of them need to be disassembled and inspected, which greatly increases the labor intensity of maintenance workers. If the middle water pipe falls off during the production process, it cannot be repaired on the machine. It can only be repaired by stopping the machine and unloading the mold, which has a great impact on production. Utility Model Content

[0005] In order to solve the above problems, the purpose of the utility model is to provide a new type of spot cooling device.

[0006] According to one aspect of the utility model, a novel spot cooling device is provided, comprising: a spot cooling head, a water transport ring, and a water transport pipe, wherein a water transport ring mounting hole, a necking hole, and a water return hole for mounting the water transport ring are provided in the spot cooling head and are connected to each other, wherein a water inlet port and a water outlet port provided on the peripheral wall of the spot cooling head for mounting a water inlet and a water outlet, respectively, are connected to the water transport ring mounting hole and the water return hole, respectively, the water transport ring is constituted as a cylinder having a hollow blind hole portion, the outer peripheral surface of the cylinder comprises a matching surface I and a matching surface II matching with the water transport ring mounting hole, a water inlet hole is provided in a recessed portion between the matching surface I for preventing water inlet leakage and the matching surface II for preventing water inlet and water outlet from flowing in and out, the water inlet hole connects the water inlet with the hollow blind hole portion of the water transport ring, the water transport pipe mounting hole processed at the bottom of the water transport ring constitutes the opening portion of the hollow blind hole portion, which is used to assemble the water transport pipe.

[0007] Preferably, the novel spot cooling device further comprises: a first pair of wires and a second pair of wires for installing a water inlet and a water outlet, respectively; and / or a third pair of wires for installing in a casting mold.

[0008] Preferably, the thread is in the form of an NPT sealing thread.

[0009] Preferably, a water transport ring mounting hole is processed at the top of the spot cooling head to cooperate with the outer diameter portion of the water transport ring, a return water hole is processed at the bottom, the water transport ring mounting hole and the return water hole are connected through a necking hole, a water inlet port and a water outlet port are processed on the side, and threads are processed at the mouths of the return water hole, the water inlet port and the water outlet port.

[0010] Preferably, the water transport ring and the water transport pipe are both welded and fixed after being assembled.

[0011] Preferably, after the water transport ring and the water transport pipe are assembled and welded, an intermediate water transport pipe with a T-shaped structure is formed. The intermediate water transport pipe is inserted from the water transport ring mounting hole of the point cold head. By utilizing the shape matching relationship between the above-mentioned T-shaped structure and the surrounding area of ​​the necking hole, the assembly adopts a shoulder-hanging table connection and then is welded and fixed.

[0012] Preferably, the front end of the water transport pipe is a 45° bevel.

[0013] Preferably, the outer diameter portion of the water transport ring forms a matching surface I and a matching surface II, which match with the water transport ring mounting hole of the spot cold head, and the matching tolerance is controlled according to the basic hole system H7 / g6.

[0014] According to another aspect of the utility model, a casting mold is provided, comprising: a water cooling hole arranged at a position where a cooling zone is required, and the above-mentioned novel spot cooling device installed in the water cooling hole via a third pair of wires, wherein cooling water enters from a water inlet, passes through the water inlet hole of a water transport ring, and then reaches the bottom of the water cooling hole through a water transport pipe, and then flows back from an annular side wall space portion I between the water transport pipe and the water cooling hole, and then flows back from annular side wall space portion II between the water transport pipe and the third pair of wires, and finally flows out from a water outlet to complete the water circuit circulation.

[0015] Preferably, the outer diameter of the water transport pipe is smaller than the inner diameter of the corresponding water transport ring installation hole, the neck hole, the third pair of threads, and the water cooling hole, and the bottom opening of the water inlet is opposite to or abuts against the water inlet hole of the water transport ring.

[0016] According to the utility model, the problem of abnormal stop of production process, low casting yield rate and long maintenance period of under-machine mold caused by point cooling failure due to falling of the middle water transport pipe of the spot cooling device can be solved. The water transport pipe and the spot cooling joint in the middle of the novel point cooling device are designed as an integrated structure, which can ensure that the water transport pipe will never fall off, thereby solving the problem of point cooling failure due to falling of the water transport pipe of the spot cooling device, ensuring the continuity and stability of the production process, and the yield and efficiency of the output castings. In addition, the step of disassembling and assembling the spot cooling device to confirm the falling of the water transport pipe can be eliminated during the under-machine maintenance of the mold, which greatly shortens the maintenance period of the mold and reduces the labor intensity of the maintenance workers.

[0017] In this way, the new spot cooling device has a simple structure, low cost and high stability. It can solve the problem of water pipe falling off during use, ensure the continuity and stability of the production process, increase the yield and efficiency of castings, greatly shorten the mold maintenance cycle, and reduce the labor intensity of maintenance workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the structural diagram of the new spot cooling device.

[0019] Figure 2 It is a diagram of the cold head structure.

[0020] Figure 3 This is a diagram of the wire structure.

[0021] Figure 4 This is a diagram of the water transport ring structure.

[0022] Figure 5 This is a diagram of the water transport pipe structure.

[0023] Figure 6 This is the structural diagram of the intermediate water transport pipe.

[0024] Figure 7 This is the installation structure diagram of the new spot cooling device. DETAILED DESCRIPTION

[0025] The exemplary embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The exemplary embodiments described below and shown in the accompanying drawings are intended to teach the principles of the present invention, so that those skilled in the art can implement and use the present invention in several different environments and for several different applications. Therefore, the scope of protection of the present invention is defined by the attached claims, and the exemplary embodiments are not intended to be, and should not be considered to be, a restrictive description of the scope of protection of the present invention. Moreover, for the convenience of description, the sizes of the various parts shown in the accompanying drawings are not necessarily drawn according to the actual proportional relationship, and the orientation description, such as the orientation or position relationship indicated by the upper, lower, left, right, top, bottom, etc., are all based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention. Throughout the accompanying drawings, the same elements are represented by the same or similar figure marks. Conventional structures or local structures will be omitted when they may cause confusion or difficulty in observing and understanding the understanding of the present disclosure. Unless otherwise specifically stated, the order and numerical values ​​of components and assembly steps set forth in the embodiments do not limit the scope of the present invention.

[0026] New spot cooling device ( Figure 1 ) is mainly composed of four spare parts, namely: spot cooling head 10, thread 20, water transport ring 30, water transport pipe 40, and each spare part is made of 304 stainless steel.

[0027] like Figure 2 As shown, the spot cooling head 10 is constructed as a hexagonal column as a whole, and the water transport ring mounting hole 4 for mounting the water transport ring 30 is connected with the return water hole 46 via the neck hole 47, wherein the water inlet port 44 and the water outlet port 45 opened on the peripheral wall of the spot cooling head 10 for mounting the water inlet 2 and the water outlet 3 are respectively connected with the water transport ring mounting hole 4 and the return water hole 46.

[0028] More specifically, the spot cold head 10 is processed with a water transport ring mounting hole 4 at the top end a to cooperate with the outer diameter portion of the water transport ring 30, and a return water hole 46 is processed at the bottom c to connect the water transport ring mounting hole 4 and the return water hole 46 through a necking hole 47, and a water inlet port 44 and a water outlet port 45 are processed on the side b, and threads 5 are processed at the mouths of the return water hole 46, the water inlet port 44 and the water outlet port 45, and the thread size is processed according to the specifications of the corresponding pairs of threads 20 (corresponding to the third pair of threads, the first pair of threads, and the second pair of threads).

[0029] like Figure 3 The thread pair 20 shown adopts a thread 6 in the form of an NPT sealing thread, and the length is determined according to the corresponding installation space position.

[0030] like Figure 4As shown, the water transport ring 30 is constituted as a cylinder with a hollow blind hole portion, and the outer peripheral surface of the cylinder includes a matching surface Ⅰ8 and a matching surface Ⅱ9 that match the water transport ring mounting hole 4, and a water inlet hole 41 is opened in the recessed portion between the matching surface Ⅰ8 and the matching surface Ⅱ9, and the water inlet hole 41 is connected to the hollow blind hole portion. When the water transport ring 30 is installed in the water transport ring mounting hole 4 of the spot cold head 10, the matching surface Ⅰ8 prevents water leakage, and the matching surface Ⅱ9 prevents water inflow and water outflow. The water inlet 2 is connected to the hollow blind hole portion of the water transport ring 30 via the water inlet hole 41.

[0031] The water transport pipe installation hole 7 processed at the bottom of the water transport ring 30 constitutes the opening of the hollow blind hole portion, which is used to install the water transport pipe 40.

[0032] like Figure 6 As shown, the intermediate water transport pipe 70 is composed of the water transport ring 30 and the water transport pipe 40. The water transport ring 30 and the water transport pipe 40 are assembled and welded to fix (mark 11 is the welding point of the water transport ring 30 and the water transport pipe 40). That is, the water transport pipe 40 is inserted into the positioning groove of the water transport pipe installation hole 7 of the water transport ring 30 for positioning, and then welded to fix, so that the water transport pipe 40 and the water transport ring 30 are connected as a whole to form a T-shaped structure.

[0033] Among them, the outer diameter of the water transport ring 30 forms a matching surface I8 and a matching surface II9, which match the water transport ring installation hole 4 of the spot cold head 10. The matching tolerance is controlled according to the basic hole system H7 / g6, and the inlet and outlet water flow is blocked after assembly. The length of the water transport pipe 40 is made according to the hole depth of the installation part, and the length is generally made 10mm shorter than the hole depth, and the front end is a 45° bevel.

[0034] like Figure 7 The installation structure of the new spot cooling device shown in the figure, after the water transport ring 30 and the water transport pipe 40 are assembled and welded to form an intermediate water transport pipe 70, the intermediate water transport pipe 70 is inserted from the water transport ring installation hole 4 of the spot cooling head 10, and the shape matching relationship between the above-mentioned T-shaped structure and the surrounding area of ​​the necking hole 47 is utilized. The assembly adopts a shoulder hanging table type connection, and then it is welded and fixed (the mark 1 is the welding point between the spot cooling head 10 and the intermediate water transport pipe 70).

[0035] The mold is provided with a water cooling hole 12 at the part where the cooling zone is required, and the above-mentioned new spot cooling device is installed. The cooling water enters from the water inlet 2, passes through the water inlet hole 41 of the water transport ring 30, and then reaches the root of the part where cooling is required, that is, the bottom of the water cooling hole 12 through the water transport pipe 40, and then flows back from the annular side wall space part Ⅰ13 between the water transport pipe 40 and the water cooling hole 12, and then flows back from the annular side wall space part Ⅱ14 between the water transport pipe 40 and the pair of wires 20, and finally flows out from the water outlet 3, and the water circuit circulation is completed, thereby achieving the purpose of local precise spot cooling. Here, the outer diameter of the water transport pipe 40 is smaller than the inner diameter of the water transport ring installation hole 4, the necking hole 47, the pair of wires 20 (equivalent to the third pair of wires), and the water cooling hole 12. The bottom opening of the water inlet 2 is opposite to or abuts against the water inlet hole 41 of the water transport ring 30.

[0036] The technical solution adopted by the novel spot cooling device to solve its technical problems is: the middle water transport pipe 70 is divided into two parts, consisting of a water transport ring 30 and a water transport pipe 40, which form a T-shaped structure after assembly. The middle water transport pipe 70 and the spot cooling head 10 are assembled using a T-shaped shoulder hanging table connection. The water transport ring 30 has two functions: the first function is to separate the inlet and outlet water channels. The principle is to use a precise clearance fit and a base hole system H7 / g6 fit tolerance to ensure that the inlet and outlet water channels will not flow in series; the second function is to fix the water transport pipe 40, and the water transport pipe 40 is spliced ​​together to form a whole to form a T-shaped structure, which is fixed inside the spot cooling head 10, so as to achieve a never-falling effect.

[0037] In the description of the present application, "multiple" means two or more than three, unless otherwise clearly and specifically defined. Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. Although the present invention has been described with reference to various specific embodiments, it should be understood that variations can be made within the spirit and scope of the concept of the described utility model. Therefore, it is intended that the present invention is not limited to the described embodiments, but will have the full scope defined by the language of the appended claims.

Claims

1. A new type of spot cooling device, characterized in that: include: A spot cooling head (10), a water transport ring (30), and a water transport pipe (40), wherein a water transport ring mounting hole (4) for mounting the water transport ring (30), a necking hole (47), and a water return hole (46) are provided in the spot cooling head (10) and are connected to each other, wherein a water inlet port (44) and a water outlet port (45) provided on the peripheral wall of the spot cooling head (10) for mounting a water inlet port (2) and a water outlet port (3) are connected to the water transport ring mounting hole (4) and the water return hole (46) respectively, and the water transport ring (30) is configured to have a hollow blind hole portion. The outer peripheral surface of the cylinder comprises a mating surface I (8) and a mating surface II (9) mating with a water transport ring mounting hole (4); a water inlet hole (41) is provided in a recessed portion between the mating surface I (8) for preventing water inlet leakage and the mating surface II (9) for preventing water inlet and water outlet from flowing in parallel; the water inlet hole (41) connects the water inlet (2) with the hollow blind hole portion of the water transport ring (30); a water transport pipe mounting hole (7) machined at the bottom of the water transport ring (30) constitutes an opening of the hollow blind hole portion for mounting the water transport pipe (40).

2. The novel spot cooling device according to claim 1 is characterized in that: Also includes: A first pair of threads and a second pair of threads respectively used for installing the water inlet (2) and the water outlet (3); and / or, a third pair of wires for mounting in the casting mould.

3. The novel spot cooling device according to claim 2 is characterized in that: The thread (20) adopts an NPT sealing thread type thread.

4. The novel spot cooling device according to claim 1 is characterized in that: The spot cooling head (10) is processed with a water transport ring mounting hole (4) at the top end to match with the outer diameter portion of the water transport ring (30), a water return hole (46) is processed at the bottom end, the water transport ring mounting hole (4) and the water return hole (46) are connected via a necking hole (47), a water inlet port (44) and a water outlet port (45) are processed at the side end, and threads (5) are processed at the mouths of the water return hole (46), the water inlet port (44) and the water outlet port (45).

5. The novel spot cooling device according to claim 1 is characterized in that: The water transport ring (30) and the water transport pipe (40) are assembled and then welded and fixed.

6. The novel spot cooling device according to claim 5 is characterized in that: After the water transport ring (30) and the water transport pipe (40) are assembled and welded, a T-shaped intermediate water transport pipe (70) is formed. The intermediate water transport pipe (70) is inserted from the water transport ring mounting hole (4) of the spot cooling head (10). The T-shaped structure and the shape matching relationship of the surrounding parts of the necking hole (47) are utilized to assemble the water transport ring (30) and then welded and fixed.

7. The novel spot cooling device according to claim 1 is characterized in that: The front end of the water transport pipe (40) is a 45° bevel.

8. The novel spot cooling device according to claim 1 is characterized in that: The outer diameter portion of the water transport ring (30) forms a matching surface I (8) and a matching surface II (9), which match with the water transport ring mounting hole (4) of the spot cooling head (10), and the matching tolerance is controlled according to the basic hole system H7 / g6.

9. A casting mold, characterized in that: include: A water cooling hole (12) provided at a location requiring a cooling zone, and a novel spot cooling device as claimed in any one of claims 1 to 8 installed in the water cooling hole (12) via a third pair of threads, wherein cooling water enters from a water inlet (2), passes through a water inlet hole (41) of a water transport ring (30), and then reaches the bottom of the water cooling hole (12) through a water transport pipe (40), and then flows back from an annular side wall space portion I (13) between the water transport pipe (40) and the water cooling hole (12), and then flows back from annular side wall space portion II (14) between the water transport pipe (40) and the third pair of threads, and finally flows out from a water outlet (3), completing the water circuit circulation.

10. The casting mold according to claim 9, characterized in that: The outer diameter of the water transport pipe (40) is smaller than the inner diameters of the corresponding water transport ring installation holes (4), the necking holes (47), the third pair of threads, and the water cooling holes (12) through which the water transport pipe (40) passes, and the bottom opening of the water inlet (2) is opposite to or abuts against the water inlet hole (41) of the water transport ring (30).

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