Cylindrical casting inner cavity spray quenching device

Abstract

The utility model discloses a spray quenching device for an inner cavity of a cylindrical casting, belongs to the field of quenching auxiliary devices, and aims to solve the problem that the spray quenching cooling of the inner cavity of the cylindrical casting is not uniform. Comprising a water pipe, an air pipe and a steel pipe sprayer used for extending into an inner cavity of the cylindrical casting in the axial direction of the cylindrical casting. The steel pipe spray head comprises a steel pipe body made of a section of steel pipe, and multiple rows of small holes are formed in the top area of the steel pipe body in the annular direction of the steel pipe body. The outlet ends of the water pipe and the air pipe are connected to the inlet end of the steel pipe nozzle. The upper surface and the lower surface of the inner cavity of the cylindrical casting are balanced in temperature, the temperature difference between the upper surface and the lower surface of the inner cavity is reduced, and circumferential quenching along the cylindrical casting is more uniform. The steel pipe spray head extends into the inner cavity of the cylindrical casting in the axial direction of the cylindrical casting for spray quenching, full-length spray quenching of the inner cavity of the cylindrical casting can be achieved, and the problem that quenching is uneven in the axial direction of the cylindrical casting is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of quenching auxiliary devices, in particular to a spray quenching device for the inner cavity of a cylindrical casting. Background Art

[0002] Under non-immersion quenching conditions for cylindrical castings, in order to meet product performance requirements, it is necessary to spray quench the inner cavity. The commonly used spray quenching methods are as follows:

[0003] The casting is loaded into the furnace in a horizontal position with the ports facing forward. Before quenching, a quenching platform is built in front of the furnace, and the casting is moved horizontally onto the platform. Spray blowers are placed at a certain distance from the two ports of the casting to spray quench the inner cavity of the casting. This method has the following obvious shortcomings in process execution:

[0004] (1) Spray quenching can only be achieved within a range of about 200 mm from the end face of the casting to the inner cavity along the axial direction, and spray quenching cannot be achieved in most of the middle and rear sections.

[0005] (2) During the spray quenching process, the temperature difference between the upper and lower surfaces of the casting cavity is large.

[0006] (3) The inner cavity spray quenching time is long, and the cooling water gathers and flows out on the lower surface of the inner cavity of the casting for a long time, and the lower surface is prone to overcooling and cracks.

[0007] In summary, the existing inner cavity spray quenching method has problems such as uneven quenching, long quenching time, and quenching cooling water gathering on the lower surface of the inner cavity, which can easily cause cracking. Utility Model Content

[0008] The utility model aims to provide a spray quenching device for the inner cavity of a cylindrical casting, so as to solve the problem of uneven cooling during spray quenching of the inner cavity of the cylindrical casting.

[0009] The technical solution adopted by the utility model is: a spray quenching device for the inner cavity of a cylindrical casting, comprising a water pipe, an air duct and a steel pipe nozzle for extending into the inner cavity of the cylindrical casting along the axial direction of the cylindrical casting; the steel pipe nozzle comprises a steel pipe body made of a section of steel pipe, and a plurality of rows of small holes are opened in the top area of ​​the steel pipe body along the circumferential direction of the steel pipe body; the outlet ends of the water pipe and the air duct are connected to the inlet end of the steel pipe nozzle.

[0010] Furthermore, the multiple rows of small holes are evenly distributed along the circumferential direction of the steel pipe body; and the multiple small holes in each row are evenly distributed along the axial direction of the steel pipe body.

[0011] Furthermore, two adjacent rows of small holes are arranged in a staggered manner.

[0012] Furthermore, the top area of ​​the steel pipe body is the area 120° along the circumferential direction directly above the steel pipe body.

[0013] Furthermore, there is one air duct and at least one water pipe.

[0014] Furthermore, there are three water pipes, which are distributed in an equilateral triangle, and two adjacent water pipes are connected together by a connecting rod; the air duct is inserted into the triangular area surrounded by the three water pipes.

[0015] Furthermore, it also includes a slide rail, and the water pipe and the air duct are supported on the slide rail and slide along the axial direction to cooperate with the slide rail.

[0016] Furthermore, there are at least two slide rails, one of which is arranged at the outlet end of the water pipe and the air duct.

[0017] The beneficial effects of the present invention are as follows: the cylindrical casting inner cavity spray quenching device disclosed by the present invention has a small hole arranged in the top area of ​​the steel pipe body, so that the spray is sprayed from the top area of ​​the steel pipe body, centered on the upper surface of the inner cavity of the cylindrical casting, and most of the spray directly quenches the upper surface of the inner cavity of the cylindrical casting. In conjunction with the cooling of the bottom area of ​​the inner cavity of the cylindrical casting due to the collection of cooling water, the temperature of the upper and lower surfaces of the inner cavity of the cylindrical casting is balanced, the temperature difference between the upper and lower surfaces of the inner cavity is reduced, and the circumferential quenching of the cylindrical casting is more uniform. The steel pipe nozzle extends into the inner cavity of the cylindrical casting along the axial direction of the cylindrical casting for spray quenching. The length of the steel pipe nozzle depends on the length of the inner cavity of the cylindrical casting, and can achieve spray quenching of the entire length of the inner cavity of the cylindrical casting, avoiding the problem of uneven quenching along the axial direction of the cylindrical casting.

[0018] It is the more uniform quenching that shortens the air cooling time after spray quenching, which not only greatly reduces the problem of casting cracking, but also improves the uniformity of casting performance, reduces production costs, shortens the entire production cycle, and improves product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a cross-sectional view of a steel pipe nozzle;

[0020] Figure 2 for Figure 1 A top view of

[0021] Figure 3 This is a schematic diagram of water pipes and air ducts;

[0022] Figure 4 for Figure 3 Left view;

[0023] Figure 5 This is a schematic diagram of the structure of the spray quenching device for the inner cavity of a cylindrical casting;

[0024] Figure 6 This is a schematic diagram of the spray quenching structure using a spray quenching device in the inner cavity of a cylindrical casting.

[0025] In the figure, there are a steel pipe nozzle 1, a steel pipe body 11, a small hole 12, a water pipe 2, an air duct 3, a connecting rod 4, and a slide rail 5. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Cylindrical castings need to be quenched after annealing and cleaning to ensure product performance. In order to facilitate operation, ensure product performance and facilitate observation of the cooling condition of the inner cavity, cylindrical castings usually adopt a flat-laying furnace loading method. Since the inner cavity of cylindrical castings at home and abroad is a cooling blind spot during the spray cooling process, it is impossible to effectively and uniformly cool the inner cavity. For this reason, the utility model adopts the profiling principle after technical analysis and designs the cylindrical casting inner cavity spray quenching device. Figure 5 As shown, it includes a water pipe 2, an air pipe 3 and a steel pipe nozzle 1 for extending into the inner cavity of the cylindrical casting along the axial direction of the cylindrical casting; Figure 1 and Figure 2 As shown, the steel pipe nozzle 1 includes a steel pipe body 11 made of a section of steel pipe, and multiple rows of small holes 12 are opened in the top area of ​​the steel pipe body 11 along the circumferential direction of the steel pipe body 11; the outlet ends of the water pipe 2 and the air duct 3 are connected to the inlet end of the steel pipe nozzle 1.

[0028] The water pipe 2 is used to supply water to the steel pipe nozzle 1, and the air pipe 3 provides high-pressure air, which is used to make the sprayed water into mist.

[0029] When the cylindrical casting inner cavity spray quenching device is used to perform the cylindrical casting inner cavity quenching process, Figure 6 As shown, first connect the steel pipe nozzle 1 to the water pipe 2 and air duct 3 and place it on the cooling platform. Then, hoist the cylindrical casting out of the furnace onto the cooling platform, aligning the casting axis with the steel pipe nozzle 1 of this device. After the casting is properly placed, push the steel pipe nozzle 1 along the slide rail into the casting cavity, and finally start to flow water and air. During the quenching process, constantly observe the spray quenching status and adjust the water volume and air pressure through the switch to meet the requirements of different quenching intensities.

[0030] Since the small hole 12 is arranged in the top area of ​​the steel pipe body 11, the spray is sprayed from the top area of ​​the steel pipe body 11, targeting the upper surface of the inner cavity of the cylindrical casting. Most of the spray directly quenches the upper surface of the inner cavity of the cylindrical casting, while the bottom area of ​​the inner cavity of the cylindrical casting is cooled due to the cooling water, so that the temperature of the upper and lower surfaces of the inner cavity of the cylindrical casting is balanced, the temperature difference between the upper and lower surfaces of the inner cavity is reduced, and the circumferential quenching along the cylindrical casting is more uniform. The cylindrical casting inner cavity spray quenching device disclosed by the utility model, the steel pipe nozzle 1 extends into the inner cavity of the cylindrical casting along the axial direction of the cylindrical casting for spray quenching. The length of the steel pipe nozzle 1 depends on the length of the inner cavity of the cylindrical casting, and can realize spray quenching of the entire length of the inner cavity of the cylindrical casting, avoiding the problem of uneven quenching along the axial direction of the cylindrical casting. The air cooling time after spray quenching is shortened and the problem of casting cracking is greatly reduced, which reduces production costs, shortens the entire production cycle, and improves product quality.

[0031] To improve the spray effect and increase the total area of ​​the small holes 12, multiple rows of small holes 12 are evenly distributed along the circumference of the steel pipe body 11; the multiple small holes 12 in each row are evenly distributed along the axial direction of the steel pipe body 11. To further increase the total area of ​​the small holes 12 within a limited range, the small holes 12 in two adjacent rows are staggered.

[0032] The top area of ​​the steel pipe body 11 is an area 120° circumferentially above the steel pipe body 11 .

[0033] There is one air duct 3 and at least one water pipe 2. According to the diameter of the inner cavity, various combinations such as one water pipe 2, two water pipes 2 or three water pipes 2 can be connected.

[0034] In this embodiment, if Figure 3 and Figure 4 As shown, there are three water pipes 2, which are arranged in an equilateral triangle, and two adjacent water pipes 2 are connected together by connecting rods 4; the air duct 3 is inserted into the triangular area surrounded by the three water pipes 2. In this way, the water pipes 2 and the air duct 3 form a whole, which is easy to move.

[0035] In order to more conveniently insert the spray quenching device into the inner cavity of the cylindrical casting for use, a slide rail 5 is also included. The water pipe 2 and the air pipe 3 are supported on the slide rail 5 and slide along the axial direction to cooperate with the slide rail 5.

[0036] In order to provide good support for the end of the steel pipe nozzle 1 , there are at least two slide rails 5 , one of which is located near the outlet ends of the water pipe 2 and the air duct 3 .

[0037] When using the present invention, it is necessary to control the cross-sectional area of ​​the steel pipe body 11, the total area of ​​the small holes 12, and the number of connected water pipes 2, and use high-pressure air to spray the water into a mist to achieve spray quenching of the inner cavity. It is also necessary to use corresponding slide rails and supports to achieve installation and operation.

[0038] In the description of this specification, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean 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 an indirect connection through an intermediate medium; it can also mean internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood by those skilled in the art in specific circumstances.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Cylindrical casting inner cavity spray quenching device, characterized by: The invention comprises a water pipe (2), an air pipe (3) and a steel pipe nozzle (1) for extending into the inner cavity of the cylindrical casting along the axial direction of the cylindrical casting; the steel pipe nozzle (1) comprises a steel pipe body (11) made of a section of steel pipe, and a plurality of rows of small holes (12) are opened in the top area of ​​the steel pipe body (11) along the circumferential direction of the steel pipe body (11); the outlet ends of the water pipe (2) and the air pipe (3) are connected to the inlet end of the steel pipe nozzle (1).

2. The cylindrical casting inner cavity spray quenching device according to claim 1, characterized in that: The multiple rows of small holes (12) are evenly distributed along the circumferential direction of the steel pipe body (11); and the multiple small holes (12) in each row are evenly distributed along the axial direction of the steel pipe body (11).

3. The cylindrical casting inner cavity spray quenching device according to claim 2, characterized in that: Two adjacent rows of small holes (12) are arranged in a staggered manner.

4. The cylindrical casting inner cavity spray quenching device according to claim 1 or 2, characterized in that: The top area of ​​the steel pipe body (11) is an area 120° along the circumferential direction just above the steel pipe body (11).

5. The cylindrical casting inner cavity spray quenching device according to any one of claims 1 to 3, characterized in that: There is one air duct (3) and at least one water pipe (2).

6. The cylindrical casting inner cavity spray quenching device according to claim 5, characterized in that: There are three water pipes (2), which are distributed in an equilateral triangle, and two adjacent water pipes (2) are connected together via a connecting rod (4); the air duct (3) is inserted into the triangular area surrounded by the three water pipes (2).

7. The cylindrical casting inner cavity spray quenching device according to any one of claims 1 to 3, characterized in that: It also includes a slide rail (5), on which the water pipe (2) and the air pipe (3) are supported and slideably matched with the slide rail (5) along their axial direction.

8. The cylindrical casting inner cavity spray quenching device according to claim 7, characterized in that: There are at least two slide rails (5), one of which is arranged at the outlet end of the water pipe (2) and the air pipe (3).

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