Method for facilitating drilling of large arc cooling wall

Abstract

The invention discloses a method for conveniently drilling a hole in a large arc-shaped cooling wall, which comprises the following steps of: 1, when a wood pattern of the large arc-shaped cooling wall is manufactured, reserving a boss at a position corresponding to a position where a through hole needs to be drilled on the wood pattern so as to reserve a groove on a sand mold, and finally forming the boss on the large arc-shaped cooling wall; 2, when the cooling water pipe is arranged in the sand mold, a plurality of sets of tools are used for positioning the cooling water pipe around the through hole so as to avoid deformation of the cooling water pipe; thirdly, the large arc-shaped cooling wall is poured through the sand mold; and fourthly, through holes are drilled in bosses formed in the large arc-shaped cooling wall. According to the invention, scrap caused by the through hole is avoided, and the production cost can be saved. And about 5000 yuan can be saved for one cooling wall of about 2.5 tons.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a method for facilitating drilling of large arc cooling wall holes. Background Art

[0002] The cast iron cooling stave is a cast iron part used in blast furnaces to cool down the furnace body. It relies on the cooling water pipes in the body to work. The directions of the cooling water pipes in different cooling staves are also different. One of the large arc cooling staves 10 has a width of more than 2 meters. The water pipes 20 are 7-shaped water pipes, and the number reaches 11. There are also through holes 11 in the middle of the water pipes 20 for measuring temperature and pressure, which are of different sizes (such as Figure 1 ).

[0003] The traditional casting process uses the sand core method. If you are not careful, the sand core will break or shift, resulting in blockage or displacement of the through hole, which cannot be repaired and leads to scrapping. If the direct drilling method is used, due to the large number of water pipes, which are closely arranged, and the deformation of the water pipes during the pouring process, it is easy to drill through the cooling water pipes, thus scrapping. This production method greatly increases production costs and reduces labor efficiency.

[0004] Especially from Figure 1 It can be seen that the curvature of this type of cooling wall is large, and the number of cooling water pipes 20 is large and closely arranged. It is difficult to use the traditional method of sand core or direct drilling. Figure 2 It can be seen that the through holes 11, especially the through holes at the edge of the cooling wall, are close to the edge of the cooling wall. If effective measures are not taken, the position of the through holes is difficult to ensure. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for drilling holes in large arc cooling walls by improving the casting process and using tooling to prevent deformation of cooling water pipes, while adopting the post-casting drilling method to ensure the accurate position and size of the holes, in order to address the problem that traditional casting processes easily cause sand core breakage or sand core displacement, resulting in blockage or position displacement of the through holes, which cannot be repaired and leads to scrapping.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] A method for drilling holes in a large arc cooling wall comprises the following steps:

[0008] Step 1: When making a wooden mold of a large arc cooling wall, a boss is reserved on the wooden mold at a position corresponding to the position where a through hole needs to be drilled, so as to leave a groove on the sand mold, and finally a boss is formed on the large arc cooling wall;

[0009] Step 2: When arranging the cooling water pipe in the sand mold, use several sets of tooling to position the cooling water pipe around the through hole to avoid deformation of the cooling water pipe;

[0010] Step 3: Use sand mold to cast large arc cooling wall;

[0011] Step 4: Drill through holes on the boss formed on the large arc cooling wall.

[0012] In a preferred embodiment of the present invention, the tooling is composed of two circular rings and a first connecting rib, and the two circular rings are connected by the first connecting rib; when positioning the cooling water pipe, a pair of tooling is placed on both sides of a groove on the sand mold, and the two circular rings on the same side of a pair of tooling are connected by a second connecting rib, so that the two first connecting ribs and the two second connecting ribs form a stable rectangle, and the groove is located in this rectangle; the cooling water pipes on both sides of the groove pass through the two circular rings on the same side of a pair of tooling and are positioned by the pair of tooling.

[0013] In a preferred embodiment of the present invention, the inner diameter of each ring is slightly larger than the outer diameter of the cooling water pipe.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0015] The through hole adopts the traditional casting method, that is, the sand core method, which can easily cause the through hole to be blocked. The cooling wall caused by this cannot be repaired and is directly scrapped. According to the scrapping of one cooling wall, it costs 2,000 yuan per ton, and one cooling wall is about 2.5 tons. The scrap loss of one cooling wall is 2,000*2.5=5,000 yuan. The production cost of the cooling wall is greatly increased and the labor efficiency is reduced. If the present invention avoids scrapping due to the through hole, the production cost can be saved. A cooling wall of about 2.5 tons can save about 5,000 yuan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the large arc cooling wall.

[0017] Figure 2 A partial view of the large curved cooling wall.

[0018] Figure 3 Schematic diagram of the wooden mold structure for forming a large arc cooling wall.

[0019] Figure 4 Schematic diagram of the partial structure of the wooden mold for forming a large arc cooling wall.

[0020] Figure 5 It is a schematic diagram of the tooling structure of the present invention.

[0021] Figure 6It is a schematic diagram of positioning two cooling water pipes by two sets of tooling of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] In order to save production costs and improve production efficiency, and to ensure the accuracy of the through-hole position on the large arc cooling wall, it is necessary to adopt the method of drilling after casting. In order to ensure that the water pipe is not damaged during the drilling process and the water pipe is drilled through, it is necessary to master the deformation law of the cooling water pipes 20a and 20b during the casting process in the early casting process, and take relevant process measures to prevent the elongation and contraction of the cooling water pipes 20a and 20b from affecting the drilling position.

[0025] See also Figures 3 to 6 , a method for facilitating large arc cooling wall drilling shown in the figure includes the following steps:

[0026] Step 1: When making the wooden mold 30 of the large arc cooling wall, a boss 31 is reserved on the wooden mold 30 at a position corresponding to the position where the through hole needs to be drilled, so as to leave a groove on the sand mold, and finally form a boss on the large arc cooling wall;

[0027] Step 2: When arranging the cooling water pipes 20a, 20b in the sand mold, use several sets of tooling 40 to position the cooling water pipes 20a, 20b around the through hole 11 to avoid deformation of the cooling water pipes 20a, 20b; each set of tooling 40 is composed of two circular rings 41, 42 and a first connecting rib 43, and the two circular rings 41, 42 are connected by the first connecting rib 43; the inner diameter of each circular ring 41, 42 is slightly larger than the outer diameter of the cooling water pipes 20a, 20b. When positioning the cooling water pipes 20a and 20b, a pair of tooling 40 is placed on both sides of a groove 60 on the sand mold, and the two rings 41 and the two rings 42 on the same side of a pair of tooling are connected by a second connecting rib 50a, 50b, so that the two first connecting ribs 43 and the two second connecting ribs 50a, 50b form a stable rectangle, and the groove 60 is located in this rectangle; the cooling water pipes 20a, 20b on both sides of the groove pass through the two rings 41, 42 on the same side of a pair of tooling and are positioned by a pair of tooling 40.

[0028] Step 3: Use sand mold to cast large arc cooling wall;

[0029] Step 4: Drill through holes on the boss formed on the large arc cooling wall.

Claims

1. A method for drilling holes in a large arc cooling wall, characterized in that: The steps include: Step 1: When making a wooden mold of a large arc cooling wall, a boss is reserved on the wooden mold at a position corresponding to the position where a through hole needs to be drilled, so as to leave a groove on the sand mold, and finally a boss is formed on the large arc cooling wall; Step 2: When arranging the cooling water pipe in the sand mold, use several sets of tooling to position the cooling water pipe around the through hole to avoid deformation of the cooling water pipe; Step 3: Use sand mold to cast large arc cooling wall; Step 4: Drill through holes on the boss formed on the large arc cooling wall.

2. A method for facilitating large arc cooling wall drilling according to claim 1, characterized in that: The tooling is composed of two circular rings and a first connecting rib, and the two circular rings are connected by the first connecting rib. When positioning the cooling water pipe, a pair of tooling is placed on both sides of a groove on the sand mold, and the two circular rings on the same side of a pair of tooling are connected by a second connecting rib, so that the two first connecting ribs and the two second connecting ribs form a stable rectangle, and the groove is located in this rectangle; the cooling water pipes on both sides of the groove pass through the two circular rings on the same side of a pair of tooling and are positioned by the pair of tooling.

3. A method for facilitating large arc cooling wall drilling according to claim 2, characterized in that: The inner diameter of each ring is slightly larger than the outer diameter of the cooling water pipe.

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