CN1085572C - Production method of composite cylinder sleeve of slurry pump - Google Patents

Abstract

The invention relates to a production method of a mud pump composite cylinder liner used in oil drilling engineering. The method includes the implementation steps of pouring composite sleeves, thermal insulation annealing, machining, inner hole intermediate frequency quenching, cutting, honing, etc. Under normal circumstances, nearly 2/3 of the processing procedures are reduced, and 30% of raw materials, energy and 40% of processing costs can be saved, which greatly reduces production costs. Utilizing the process can greatly improve production efficiency, reduce cost, obtain considerable economic benefits, and is suitable for popularization and application.

Description

Production method of composite cylinder liner for mud pump

The invention relates to a production method of a mud pump cylinder liner used as a main accessory of special equipment for petroleum drilling engineering.

Mud pump cylinder liner is an indispensable main part of special equipment for oil drilling engineering. Due to its harsh working environment and easy wear and tear, it is used in large quantities. In order to meet the needs of work, improve wear resistance and reduce production costs, composite cylinder liners made of two or more metals have been developed and produced at home and abroad in recent years. At present, the production process of this kind of composite cylinder liner is mainly to use the inner and outer shells to be poured and processed separately, and then hot-mounted together to form an inlaid type cylinder liner. Its disadvantage is that the entire production process is complicated and requires a lot of manpower, material resources, and financial resources, and it is very easy to have different types of waste products such as cracking of inserts, shedding, ferrules, etc., so the cost is still high.

The object of the present invention is to provide a mud pump composite cylinder liner production method with simple procedure, easy implementation and low cost.

The production method of the mud pump composite cylinder liner provided by the present invention includes pouring the composite sleeve, thermal insulation annealing, machining, inner hole intermediate frequency quenching, cutting processing, and honing processes. The implementation, operation steps and main points are as follows:

1. Pouring composite sleeve. Two medium-frequency induction furnaces are used to smelt molten steel with two components at the same time, and the molten steel is poured on a J513 stepless speed-adjustable horizontal centrifugal pouring machine. When pouring, use a fast galvanic couple to measure the temperature. The pouring temperature of the outer jacket is 1520--1550°C, and the pouring temperature of the inner jacket is 1380-1420°C. The speed of the centrifuge is selected according to the diameter of the casing. When the diameter of the pouring casing is 240-300mm, the speed is 500-650 rpm. When the jacket molten steel is poured to 3/4, add 300-500 grams of interface protective agent containing calcium and sodium ions to the remaining 1/4 jacket molten steel to finish pouring the jacket; after an interval of 20-35 seconds, increase the speed to 820 Turn per minute and then pour the second layer of molten steel; if it is a three-component molten steel composite sleeve, then pour the third layer of molten steel after an interval of 20-35 seconds, and the last layer of molten steel poured is the inner casing. Here, the specific interval time is adjusted and controlled according to the mold temperature.

2. Insulation annealing. After all the molten steel has been poured for 10 seconds, water is poured on the mold to cool it down. After the mold turns for 2 minutes, stop the machine, stop the water, and release the mold. Immediately after the casting is out of the mold, it is placed in the heat preservation ash for heat preservation and annealing.

3. Machining. On the C6163 lathe, the outer circle is roughly turned, both ends are rough turned, and then the inner hole is turned.

4. Intermediate frequency liquid fire in the inner hole. Use a 160KW, 8000HZ intermediate frequency power supply and a quenching machine tool to implement. First preheat the cylinder liner to 400-450°C, then increase the current to make the inner surface of the cylinder liner reach the quenching temperature of 980±10°C, and use air cooling or water cooling as the quenching agent while heating and quenching, and the quenching is completed in about 2 minutes process, the hardness of the quenched layer can reach more than HRC60, and the depth can reach more than 2mm.

5. Cutting processing. On the 6163 lathe, the outer circle is finished, the two ends are finished, and the corners are chamfered.

6. Honing. Grind the inner hole on the M4220 honing machine until it meets the specification. The production method of the mud pump composite cylinder liner provided by the invention breaks through the common method of manufacturing composite cylinder liners at home and abroad, and reduces nearly 2/3 of the processing procedures and can save 30% while ensuring product quality and performance Raw materials, energy and 40% processing costs greatly reduce production costs. Utilizing this production process can greatly improve production efficiency, reduce costs, obtain considerable economic benefits, and is suitable for popularization and application.

Fig. 1 is a schematic diagram of the process of implementing the pouring composite sleeve in the present invention. In the figure, the number "1" is the pouring bucket, "2" is the casting mold, "3" is the baffle, "4" and "5" are the pouring jacket and inner jacket respectively, and "6" is the pouring machine.

Fig. 2 is a schematic diagram of the process of implementing the intermediate frequency quenching process of the inner hole in the present invention. In the figure, the label "7" is the intermediate frequency power supply inductor, "8" is the pressure plate, "9" is the centralizer, "10" is the magnetic conductor, "11" is the induction coil, "12" is the coolant, "13" It is the base of the quenching machine tool, and "4" and "5" are the outer and inner sleeves of the composite cylinder liner respectively.

Claims (1)

1. A method for producing a composite cylinder liner for a mud pump, characterized in that the method includes pouring the composite sleeve, thermal insulation annealing, machining, inner hole intermediate frequency quenching, cutting, and honing, and its implementation steps are as follows: (1) Casting composite sleeves Use two medium-frequency induction furnaces to melt molten steel with two components at the same time, and pour on a stepless speed-adjustable horizontal centrifugal pouring machine. The pouring temperature of the outer sleeve is 1520--1550 ° C, and the pouring temperature of the inner sleeve is 1380- -1420°C, the centrifuge speed is selected according to the diameter of the jacket, and the speed is 500-650 rpm at 240-300mm; when the jacket molten steel is poured to ^3/4 , add 300- to the remaining 1/4 jacket molten steel 500 grams of interface protective agent containing calcium and sodium ions, pour the outer jacket; after an interval of 20-35 seconds, increase the speed to 820 rpm and then pour the inner jacket molten steel; (2) Insulation annealing After all the molten steel is poured for 10 seconds, pour water on the mold to cool it down, stop the mold after 2 minutes, stop the water, and release the mold; after the casting is released from the mold, immediately put it in the insulation ash for insulation annealing; (3) Machining On the C6163 lathe, the outer circle is roughly turned, both ends are rough turned, and then the inner hole is turned; (4) Intermediate frequency quenching of the inner hole Use a 160KW, 8000HZ intermediate frequency power supply and a quenching machine to implement, first preheat the cylinder liner to 400--450°C, and then increase the current to make the inner surface of the cylinder liner reach the quenching temperature of 980±10 ℃, and use air cooling or water cooling as the quenching agent while heating and quenching for about 2 minutes; (5) Machining On the C6163 lathe, the outer circle is finished, the two ends of the machine are finished, and the chamfer is turned; (6) Honing Grind the inner hole on the M4220 honing machine until it meets the technical requirements.

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