Preparation method of zirconium ball valve element

Abstract

The invention discloses a preparation method of a zirconium ball valve core, which is characterized by comprising the following steps: S1, smelting to obtain a zirconium ingot with the specification of phi 600mm; s2, saw cutting is conducted, and the materials are divided into four equal parts; s3, cogging forging is conducted, and a rough circle of phi 350 mm is manufactured; s4, sawing again; s5, blank manufacturing and forging are carried out, and a blank with the height being 330 mm is obtained; s6, punching is conducted, and an annular blank is obtained; and S7, a finished product is rolled into the blank, an 80KN broaching machine is used for broaching, an inner hole and the outer diameter are continuously rolled to the forging size, then heat treatment is conducted, finish machining is completed after heat treatment, and the valve element is obtained. The preparation method of the valve element is suitable for batch production, the product structure uniformity is stable, the quality is good, the overall strength is high, abrasion is not prone to occurring, raw materials are saved, the regular spherical surface is directly rolled, the machining amount is small, the machining time cost is greatly reduced, and the cost is greatly reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of zirconium ball valve cores, and specifically relates to a method for preparing a zirconium ball valve core. Background Technology

[0002] A ball valve is a valve in which the opening and closing element (ball) is driven by the valve stem and rotates around the valve axis. It can also be used for fluid regulation and control. The valve core is a valve component that uses the movement of the valve body to achieve the basic functions of directional control, pressure control, or flow control. Its shape is spherical. In many chemical fields, it is necessary to control the flow of highly corrosive media. Accordingly, ball valves and ball cores are generally made of highly corrosion-resistant zirconium material. Since the ball core of a ball valve is generally cast and solid except for the pipe diameter, it consumes a lot of zirconium material, resulting in high cost. Moreover, the overall strength of the cast valve core is low and it is easy to wear. Therefore, there is an urgent need for a method for preparing zirconium ball valve cores to solve the above problems. Summary of the Invention

[0003] In view of the problems mentioned in the background art, the purpose of this invention is to provide a method for preparing a zirconium ball valve core.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for preparing a zirconium ball valve core, characterized by comprising the following steps:

[0006] S1: Smelting, selecting industrial grade sponge zirconium, adding zirconium ro2 and iron nails, and smelting in a solid consumable furnace to obtain zirconium ingots weighing 4T and with a specification of Ф600mm;

[0007] S2: Sawing. After the cap of the ingot is removed using a saw, it is divided into four equal parts, each weighing 1 ton.

[0008] S3: Forging: Heat the ingot to 1000-1050℃ and hold for 360-420mm. After reaching the desired temperature, use a 3500T hydraulic press to first shape it to 440x440x800, then lower the 800mm height to about 500mm. Repeat this process twice to make the billet into a rough round shape with a diameter of Ф350mm.

[0009] S4: Cut again to cut the Ф350mm rough round material obtained in S3 into 435kg pieces with a length of 700mm.

[0010] S5: Billet forging, heating a Ф350mm blank to 830℃, holding it for 240min, and then rapidly pressing it down from a height of 700mm to obtain a billet with a height of 330mm;

[0011] S6: Temper the billet obtained in S5 for 1.5 hours and then punch holes with a diameter of approximately Ф170±10mm to obtain a ring-shaped billet;

[0012] S7: Finished rolled billet. The annular billet obtained from S6 is heated to 830℃ and held for 180 minutes. The hole is expanded using an 80KN reamer. The inner hole and outer diameter are continuously rolled to the forging size. After heat treatment, the valve core is obtained by finishing after heat treatment.

[0013] Further specified, in S1, the zirconium ingot composition must satisfy: Hf≤3.0, Fe+Gr≤0.2, c≤0.03, N≤0.02, H≤0.005, 0:0.11~0, 14.

[0014] Further defining S5, when the billet is rapidly pressed down from a height of 700mm to obtain the billet, it is a single forging process.

[0015] Further specified, in S7, the heat treatment temperature is 650℃±10℃, the moisture retention time is 150mm, the product is removed from the furnace and cooled in the air, and then fine processing is performed.

[0016] The beneficial effects of the present invention are as follows: The valve core preparation method of the present invention is suitable for mass production, the product has stable and uniform structure and good quality, high overall strength, is not easy to wear, and saves raw materials. It is directly rolled into a regular spherical surface, with small processing amount and significantly reduced processing time and cost. Attached Figure Description

[0017] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0018] Figure 1 This is a schematic diagram of the blank used in a method for preparing a zirconium ball valve core according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of an annular blank used in a method for preparing a zirconium ball valve core according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the finished rolled blank of a method for preparing a zirconium ball valve core according to an embodiment of the present invention; Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] The present invention discloses a method for preparing a zirconium ball valve core, characterized by comprising the following steps:

[0023] S1: Smelting, selecting industrial grade sponge zirconium, adding zirconium ro2 and iron nails, and smelting in a solid consumable furnace to obtain zirconium ingots weighing 4T and with a specification of Ф600mm;

[0024] S2: Sawing. After the cap of the ingot is removed using a saw, it is divided into four equal parts, each weighing 1 ton.

[0025] S3: Forging: Heat the ingot to 1000-1050℃ and hold for 360-420mm. After reaching the desired temperature, use a 3500T hydraulic press to first shape it to 440x440x800, then lower the 800mm height to about 500mm. Repeat this process twice to make the billet into a rough round shape with a diameter of Ф350mm.

[0026] S4: Cut again to cut the Ф350mm rough round material obtained in S3 into 435kg pieces with a length of 700mm.

[0027] S5: Billet forging, heating a Ф350mm blank to 830℃, holding it for 240min, and then rapidly pressing it down from a height of 700mm to obtain a billet with a height of 330mm;

[0028] S6: Temper the billet obtained in S5 for 1.5 hours and then punch holes with a diameter of approximately Ф170±10mm to obtain a ring-shaped billet;

[0029] S7: Finished rolled billet. The annular billet obtained from S6 is heated to 830℃ and held for 180 minutes. The hole is expanded using an 80KN reamer. The inner hole and outer diameter are continuously rolled to the forging size. After heat treatment, the valve core is obtained by finishing after heat treatment.

[0030] Preferably, in S1, the zirconium ingot composition should meet the following requirements: Hf≤3.0, Fe+Gr≤0.2, c≤0.03, N≤0.02, H≤0.005, 0:0.11~0, 14.

[0031] Preferably, in S5, the billet is rapidly pressed down from a height of 700mm to obtain the billet, which is a one-time forging process.

[0032] Preferably, in S7, the heat treatment temperature is 650℃±10℃, the moisture retention is 150mm, the product is cooled in the air after being removed from the furnace, and then it is finely processed.

[0033] In this embodiment, industrial-grade sponge zirconium is selected during preparation. ZrO2 and iron nails are added, and the zirconium ingot is obtained by melting and smelting in a stable consumable furnace, weighing 4 tons and measuring Ф600mm. After the cap of the ingot is removed by a saw, it is divided into four equal parts, each weighing 1 ton. Then, the ingot is heated to 1000-1050℃ and held for 360-420mm. After reaching the desired temperature, a 3500T hydraulic press is used to first shape it to 440x440x800mm, and then the 800mm height is lowered to about 500mm. This process is repeated twice to form a blank with a diameter of Ф350mm. 435kg of the Ф350mm blank is cut into 700mm lengths. The Ф350mm blank is heated to 830℃, held for 240min, and then quickly pressed from a height of 700mm to obtain a blank with a height of 330mm (e.g., ...). Figure 1 After tempering the billet for 1.5 hours, punch holes with a diameter of approximately Ф170±10mm to obtain a ring-shaped billet (e.g. Figure 2 The annular billet is heated to 830℃ and held for 180 minutes, then expanded using an 80KN reamer (e.g., ...). Figure 3 The inner and outer diameters are continuously rolled to the forging dimensions, followed by heat treatment, and then precision machining is completed to obtain the valve core.

[0034] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for preparing a zirconium ball valve core, characterized in that: Includes the following steps: S1: Smelting, selecting industrial grade sponge zirconium, adding zirconium ro2 and iron nails, and smelting in a solid consumable furnace to obtain zirconium ingots weighing 4T and with a specification of Ф600mm; S2: Sawing. After the cap of the ingot is removed using a saw, it is divided into four equal parts, each weighing 1 ton. S3: Forging: Heat the ingot to 1000-1050℃ and hold for 360-420mm. After reaching the desired temperature, use a 3500T hydraulic press to first shape it to 440x440x800, then lower the 800mm height to about 500mm. Repeat this process twice to make the billet into a rough round shape with a diameter of Ф350mm. S4: Cut again to cut the Ф350mm rough round material obtained in S3 into 435kg pieces with a length of 700mm. S5: Billet forging, heating a Ф350mm blank to 830℃, holding it for 240min, and then rapidly pressing it down from a height of 700mm to obtain a billet with a height of 330mm; S6: Temper the billet obtained in S5 for 1.5 hours and then punch holes with a diameter of approximately Ф170±10mm to obtain a ring-shaped billet; S7: Finished rolled billet. The annular billet obtained from S6 is heated to 830℃ and held for 180 minutes. The hole is expanded using an 80KN reamer. The inner hole and outer diameter are continuously rolled to the forging size. After heat treatment, the valve core is obtained by finishing after heat treatment.

2. The method for preparing a zirconium ball valve core according to claim 1, characterized in that: In S1, the zirconium ingot composition must satisfy: Hf≤3.0, Fe+Gr≤0.2, c≤0.03, N≤0.02, H≤0.005, 0:0.11~0, 14.

3. The method for preparing a zirconium ball valve core according to claim 2, characterized in that: In S5, the billet is rapidly pressed down from a height of 700mm to obtain the billet, which is a single forging process.

4. The method for preparing a zirconium ball valve core according to claim 3, characterized in that: In S7, the heat treatment temperature is 650℃±10℃, the moisture retention time is 150mm, the product is removed from the furnace and cooled in the air, and then it is finished.

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