CN111687369A - Forging method of petroleum valve block for fracturing pump - Google Patents
Forging method of petroleum valve block for fracturing pump Download PDFInfo
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- CN111687369A CN111687369A CN202010749728.XA CN202010749728A CN111687369A CN 111687369 A CN111687369 A CN 111687369A CN 202010749728 A CN202010749728 A CN 202010749728A CN 111687369 A CN111687369 A CN 111687369A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/20—Making machine elements valve parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
Abstract
The invention relates to a method for forging a petroleum valve block for a fracturing pump, which mainly comprises the following steps: annealing the cylindrical steel ingot subjected to electroslag remelting; horizontally placing the cylindrical steel ingot on a lower flat anvil, clamping one end of the cylindrical steel ingot through a clamping device, rotating the cylindrical steel ingot, and simultaneously pressing the surface of the cylindrical steel ingot downwards by using an upper flat anvil and a lower flat anvil; obliquely placing the steel ingot on a lower flat anvil through a clamping device, rotating the steel ingot, simultaneously pressing the edge position of the upper end part of the steel ingot downwards by using an upper flat anvil, and then putting the steel ingot into a furnace for heating; vertically placing a steel ingot on a lower flat anvil, forging the end part of the steel ingot until annular planes at two ends of the steel ingot disappear, and then placing the steel ingot into a furnace for heating; carrying out primary drawing treatment; carrying out primary upsetting treatment; carrying out secondary drawing treatment; carrying out second upsetting treatment; and (5) finishing and forming. The forging method of the petroleum valve block for the fracturing pump provided by the invention improves the cracking problem of the forged piece.
Description
Technical Field
The invention relates to a metal material forging method, in particular to a forging method of a petroleum valve block for a fracturing pump.
Background
With the continuous exploitation of existing oil field resources in the world, the yield of oil wells is reduced day by day, and fracture acidizing becomes one of the most effective measures for improving the oil and gas well recovery rate at present, so that high-power and large-displacement fracturing equipment is needed for the exploitation of low-permeability oil and gas wells and deep oil and gas wells. The fracturing pump is a core part of a fracturing truck in the fracturing equipment, and an oil valve block on the fracturing pump is an alloy part on the fracturing pump. In the forging process of the petroleum valve block in the existing fracturing pump, the surface is easy to crack, and the centers of two ends of the product are easy to crack.
The Chinese patent application with the publication number of CN109943782A discloses a processing method of a 00Cr17Ni14Mo2 stainless steel valve block, which is suitable for being used in a high-pressure and corrosive environment and particularly can be used for manufacturing a high-pressure valve used in a high-permeation corrosive atmosphere. The preparation steps comprise vacuum melting and casting, preparing alloy materials according to a proportion, and obtaining an ingot through vacuum melting; the alloy comprises the following components in percentage by mass: 10-15 wt% of Ni, 15-18 wt% of Cr, 2-3 wt% of Mo and the balance of Fe; hot forging or hot rolling cogging to obtain an extruded blank; performing hydrostatic extrusion at medium temperature to obtain a thick plate with a square section; cold pressing, strengthening and shaping to obtain a valve block; and (4) low-temperature stress relief heat treatment. The 00Cr17Ni14Mo2 stainless steel valve block manufactured by the processing technology has the characteristics of high strength, high toughness, high corrosion resistance, high air tightness and the like, and can be used for manufacturing valve body parts, in particular valve body parts of high-pressure valves used in high-permeation corrosion atmospheres. However, because the grade of the petroleum valve block for the fracturing pump is 17-4PH, the forging method cannot solve the problems that the surface of the petroleum valve block is easy to crack and the centers of two ends of a product are easy to crack in the forging process of the petroleum valve block in the fracturing pump due to the particularity of materials.
Accordingly, it is desirable to provide a method of forging a frac pump oil valve block.
Disclosure of Invention
The invention aims to provide a forging method of a petroleum valve block for a fracturing pump, which effectively solves the cracking problem of a forged piece, improves the production quality of a product, integrates the advantages before the process is changed, overcomes the defects before the process is changed, leads the forging industry level, reduces the production cost, improves the production efficiency and fills the technical vacancy.
In order to achieve the purpose of the invention, the forging method of the petroleum valve block for the fracturing pump mainly comprises the following steps:
s1, annealing the cylindrical steel ingot subjected to electroslag remelting at the annealing temperature of 620-670 ℃ for 25-40 h, cooling the cylindrical steel ingot to 300 ℃ along with the furnace, taking out the cylindrical steel ingot, air-cooling the cylindrical steel ingot to room temperature, putting the cylindrical steel ingot into the furnace, continuously heating the cylindrical steel ingot at the heating temperature of 1150-1180 ℃, controlling the heating rate at 60-80 ℃/h, and keeping the temperature for 13-18 h, wherein the grade of the raw material of the cylindrical steel ingot is 17-4 PH;
s2, horizontally placing the cylindrical steel ingot processed in the step S1 on a lower flat anvil, clamping one end of the cylindrical steel ingot through a clamping device, rotating the cylindrical steel ingot, and simultaneously pressing the surface of the cylindrical steel ingot downwards by using the upper flat anvil and the lower flat anvil until the side surface of the cylindrical steel ingot is changed into an N-shaped side from a round side, wherein N is more than or equal to 4;
s3, obliquely placing the steel ingot processed in the step S2 on a lower flat anvil in the vertical direction through a clamping device, pressing the edge of the upper end of the steel ingot downwards by using an upper flat anvil, simultaneously rotating the steel ingot along the axis of the steel ingot until annular planes are formed at the edges of two ends of the steel ingot, placing the two ends of the steel ingot into a drum shape, heating the steel ingot in a furnace at 1150-1180 ℃, and controlling the heating rate at 60-80 ℃/h;
s4, vertically placing the steel ingot processed in the step S3 on a lower flat anvil, forging the end part of the steel ingot until annular planes at two ends of the steel ingot disappear, then placing the steel ingot into a furnace for heating, wherein the heating temperature is 1150-1180 ℃, the heating rate is controlled to be 60-80 ℃/h, and the heat preservation time is more than or equal to 2 h;
s5, carrying out primary drawing treatment, wherein the forging ratio is 1.4-1.8, then putting the steel plate into a furnace for heating, the heating temperature is 1120-1180 ℃, and the heat preservation time is more than or equal to 2 hours;
s6, carrying out primary upsetting treatment, wherein the forging ratio is 1.8-2.2, then putting the blank into a furnace for heating, the heating temperature is 1100-1150 ℃, and the heat preservation time is more than or equal to 2 hours;
s7, second drawing, wherein the forging ratio is 2.0-2.4, and then the steel is placed into a furnace to be heated, the heating temperature is 1060-11100 ℃, and the heat preservation time is more than or equal to 2 hours;
s8, carrying out secondary upsetting treatment, wherein the forging ratio is 1.8-2.2, then putting the blank into a furnace for heating, the heating temperature is 1010-1060 ℃, and the heat preservation time is controlled to be 0.5-1 h;
and S9, replacing the upper and lower flat anvils, drawing the steel ingot, and finally finishing and forming.
Preferably, the heating is carried out to 1150-1180 ℃ in step S1, and the heating is divided into three stages: respectively a first temperature rise stage and a first heat preservation stage; a second temperature rise stage and a second heat preservation stage; a third temperature rise stage and a third heat preservation stage;
wherein the first temperature rise stage and the first heat preservation stage are that the temperature is raised from room temperature to the first heat preservation temperature of 350 +/-10 ℃ at the temperature rise rate of 60 ℃/h, and the temperature is preserved for 5 h;
the second temperature rise stage and the second heat preservation stage are that the temperature is raised from the first heat preservation temperature to the second heat preservation temperature of 850 +/-10 ℃ at the temperature rise rate of 70 ℃/h, and the temperature is preserved for 6 h;
and the second temperature rise stage and the second heat preservation stage are that the temperature is raised from the second heat preservation temperature to a third heat preservation temperature of 1150-1180 ℃ at a temperature rise rate of 80 ℃/h, and the temperature is preserved for 13-18 h.
Preferably, in step S1, the annealing temperature is 650 ℃, the temperature is kept for 30h, and the annealing furnace is cooled to 300 ℃, taken out and air-cooled to the room temperature.
Preferably, in step S1, the heating temperature is 1180 ℃, and the temperature is kept 18; in S3, heating at 1180 ℃ and keeping the temperature for 18 h; in S4, heating at 1180 ℃ and keeping the temperature for 2 hours; in S5, heating at 1180 ℃ and keeping the temperature for 2 hours; in S6, heating at 1150 ℃ and keeping the temperature for 2 h; in S7, heating at 1100 deg.C, and maintaining for 2 h; in S8, the heating temperature is 1050 ℃, and the temperature is kept for 1 h.
Preferably, in step S1, after the annealing treatment, the scraps at both ends of the cylindrical ingot are sawed off and placed in a furnace to be heated.
Preferably, in step S2, the clamping device clamps one end of the cylindrical steel ingot, and presses the surface of the electroslag ingot by using an upper/lower flat anvil, the cylindrical surface is pressed once to form two planes, then the cylindrical surface is rotated 90 degrees to press the cylindrical surface into a quadrangle, then the cylindrical surface is rotated 45 degrees, the upper flat anvil is pressed downwards, then the cylindrical surface is rotated 90 degrees, the upper flat anvil presses the cylindrical surface into an octagon, and finally the side corners of the octagonal steel ingot are chamfered.
Preferably, in step S2, the rolling reduction is controlled to be 30-40mm each time.
Preferably, in steps S5 to S8, after each elongation or upsetting, the corners of the side surfaces are forged until a flat surface is formed, and then the flat surface is placed in a furnace for heating.
Preferably, in step S5, the forging ratio of the first drawing process is 1.72; in step S6, the forging ratio of the first upsetting process is 1.93; in step S7, the forging ratio of the second drawing process is 2.25; in step S8, the forging ratio of the second upsetting process is 2.05.
Compared with the prior art, the forging method of the petroleum valve block for the fracturing pump has the following advantages that:
(1) in step S1, a step-type heating mode is adopted, which can effectively eliminate the internal stress generated in the process of heating to the initial forging temperature and the structural stress generated in the process of transforming the structure, and prevent the material from cracking in the forging process;
(2) in step S2, the ingot body of the steel ingot has pits on its surface, slag channels on its surface, and air holes on the ingot body surface, and the slag channels are not eliminated, and the cracks are in an extended form and extend deep into the ingot body to enlarge the cracks; clamping one end of a cylindrical steel ingot by a clamping device, rotating the cylindrical steel ingot at intervals, and pressing the surface of the cylindrical steel ingot by using an upper flat anvil at intervals until the side surface of the cylindrical steel ingot is changed from a circle to a polygon, so that the problems of pits, slag channels, surface air holes and the like on the surface of an ingot body are solved, and the surface plasticity of the steel ingot is improved;
(3) in step S3, the steel ingot is rotated at intervals, and the upper flat anvil is used to press down the edge of the upper end of the steel ingot at intervals until the edges of both ends of the steel ingot form an annular plane, and then the steel ingot is placed into a furnace to be heated, so as to repeatedly forge the edge positions of both ends of the steel billet to form an as-cast structure, improve the forging performance of the surface, and prevent both ends of the steel billet from cracking during upsetting;
(4) in steps S5-S8, after each drawing or upsetting, the corners of the side faces of the billet are forged until a plane is formed, and then the billet is placed into a furnace to be heated, in the forging process, the corner clearing cooling on the periphery of the billet is faster than the intermediate cooling, the temperature of the peripheral corners is lower than the finish forging temperature of the material, the intermediate temperature is higher than the finish forging temperature, the problem of corner cracking is caused when the forging is continued, the temperature is not too fast after the corners of the billet are forged into the plane, the generation of cracks can be reduced, and the forging time is prolonged;
(5) the problems that the surface and the centers of two ends of a product are cracked in the forging process and the like are effectively solved, the production quality of the product is improved, the advantages before the process is changed are integrated, the defects before the process is changed are overcome, the forging industry level is led, the production cost is reduced, the production efficiency is improved, and the technical vacancy is filled.
Drawings
FIG. 1 is a flow chart illustrating the forging of a petroleum valve block for a fracturing pump in comparative example 1;
FIG. 2 is a forging flow chart of a petroleum valve block for a fracturing pump in example 1;
FIG. 3 is a microstructure topography 1 of a petroleum valve block for a fracturing pump in comparative example 1;
FIG. 4 is a microstructure topography of the petroleum valve block for a fracturing pump of comparative example 2;
FIG. 5 is a microstructure of a petroleum valve block for a fracturing pump in example 1;
FIG. 6 is a microstructure topography of the oil valve block for a fracturing pump of example 1;
FIG. 7 is a graph showing the temperature rise in the stage heating in example 1.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
Example 1
The diameter of the section of the cylindrical steel ingot is 760mm, the length of the cylindrical steel ingot is 1025mm, and the grade of the cylindrical steel ingot is 17-4 PH;
as shown in fig. 2, a forging method of an oil valve block for a fracturing pump comprises the following steps:
step S1, annealing the cylindrical steel ingot after the electroslag remelting treatment, wherein the annealing temperature is 650 ℃, keeping the temperature for 30h, cooling the cylindrical steel ingot to 300 ℃ along with a furnace, taking out the cylindrical steel ingot, air-cooling the cylindrical steel ingot to room temperature, sawing off waste materials at two ends of the cylindrical steel ingot, and annealing after the electroslag remelting is carried out, so that the internal stress in the steel ingot in the electroslag remelting process is removed, and the forgeability of the material is improved; then putting the mixture into a furnace for heating in three stages, namely a first heating stage and a first heat preservation stage; a second temperature rise stage and a second heat preservation stage; a third temperature rise stage and a third heat preservation stage;
as shown in fig. 7, the first temperature raising stage + the first heat preservation stage includes raising the temperature from room temperature to a first heat preservation temperature of 350 ℃ ± 10 ℃ at a temperature raising rate of 60 ℃/h, and preserving the temperature for 5h, at which time, the material starts to generate crystal phase transformation, so as to generate about 10% of lower bainite, and preserving the temperature for 5h, so as to eliminate thermal stress generated by heating and tissue stress generated by tissue transformation at this stage, and selecting the temperature preservation at 350 ℃ ± 10 ℃, mainly considering that on the premise of not affecting the heating efficiency, because only about 10% of lower bainite is generated, the relatively generated tissue stress is relatively small, so as to facilitate rapid heat preservation and elimination, for example, at a temperature higher than 350 ℃ ± 10 ℃, the generated lower bainite is relatively large, the tissue stress generated by phase transformation is relatively large, and the time required for heat preservation is relatively long; if the temperature is lower than 350 +/-10 ℃, heat preservation is carried out under the condition that phase change does not occur, only internal stress generated by heating can be eliminated, the significance is not great, and the heating efficiency is influenced;
the second temperature rise stage and the second heat preservation stage are that the temperature is raised from the first heat preservation temperature to the second heat preservation temperature of 850 +/-10 ℃ at the temperature rise rate of 70 ℃/h, and the temperature is preserved for 6 h; by continuing heating, the blank is further uniformly heated and heated, and simultaneously the heat preservation is carried out at 850 +/-10 ℃ to ensure that the material is subjected to austenite transformation to achieve a forged tissue state, and the heat preservation is carried out for 6 hours, so that the thermal stress generated by heating at the stage and the tissue stress generated by tissue transformation can be eliminated;
the third temperature rise stage and the third heat preservation stage are that the temperature is raised from the second heat preservation temperature to a third heat preservation temperature 1180 ℃ at a temperature rise rate of 80 ℃/h, the temperature is preserved for 18h, the temperature is reached after the temperature is heated to 1180 ℃, the surface temperature of the steel ingot is consistent with the furnace temperature, but the core temperature is not raised to the initial forging temperature, the purpose of heat preservation is adopted so that the surface temperature is consistent with the core temperature, the steel ingot has the forgeability just before the integral temperature is consistent, and in addition, the thermal stress generated by heating in the stage and the tissue stress generated by tissue transformation can be eliminated; the third heat preservation temperature 1180 ℃ is about 80 ℃ lower than the melting temperature of the material, so that the material is maintained in a solid solution state, and forging is facilitated; and the heat preservation for a long time ensures that the core part of the material also reaches the same temperature and has consistent internal and external mechanical properties.
Step S2, horizontally placing the cylindrical steel ingot processed in the step S1 on a lower flat anvil, clamping one end of the cylindrical steel ingot through a clamping device, pressing the surface of the electroslag ingot by adopting the upper flat anvil and the lower flat anvil, pressing the cylindrical surface once to form two planes, then rotating the cylindrical surface 90 degrees to press the cylindrical surface into a quadrangle, then rotating the cylindrical surface 45 degrees to press the cylindrical surface downwards, then rotating the cylindrical surface 90 degrees to press the cylindrical surface into an octagon, and finally performing chamfering on the octagon, wherein the amount of each pressing is controlled to be 30-40 mm; the method aims to solve the problems that a slag groove is formed on the surface of an electroslag ingot after slag is discharged, and the slag groove is flattened by rounding, so that the risk of subsequent upsetting and cracking is reduced; in addition, the forging is carried out according to the mode, so that a slag runner on the surface of the steel ingot can be completely treated, and the influence of a missing part on the later forging is avoided;
step S3, obliquely placing the steel ingot processed in the step S2 on a lower flat anvil in the vertical direction through a clamping device, pressing the edge of the upper end of the steel ingot downwards by using an upper flat anvil, simultaneously rotating the steel ingot along the axis of the steel ingot until the edges of two ends of the steel ingot form an annular plane, wherein two ends of the steel ingot are drum-shaped, then placing the steel ingot into a furnace for heating, wherein the heating temperature is 1180 ℃, the heating rate is controlled at 60-80 ℃/h, and the temperature is kept for 18 h;
step S4, vertically placing the steel ingot processed in the step S3 on a lower flat anvil, forging the end part of the steel ingot until annular planes at two ends of the steel ingot disappear, then placing the steel ingot into a furnace for heating, wherein the heating temperature is 1180 ℃, the heating rate is controlled to be 60-80 ℃/h, and the temperature is kept for 2 h;
step S5, carrying out primary drawing treatment, wherein the forging ratio is 1.72, then putting the steel tube into a furnace for heating, the heating temperature is 1180 ℃, and keeping the temperature for 2 hours;
step S6, carrying out primary upsetting treatment, wherein the forging ratio is 1.93, then putting the blank into a furnace for heating, the heating temperature is 1150 ℃, and keeping the temperature for 2 hours;
step S7, second drawing, wherein the forging ratio is 2.25, and then the steel is placed into a furnace to be heated, the heating temperature is 1100 ℃, and the temperature is kept for 2 hours;
step S8, carrying out second upsetting treatment, wherein the forging ratio is 2.05, then putting the blank into a furnace for heating, the heating temperature is 1050 ℃, and the heat preservation time is controlled to be 1 h;
and step S9, replacing the upper and lower flat anvils, drawing the steel ingot, and finally finishing into a cuboid structure of 680 x 660 x 1700 mm.
In steps S5-S8, after each elongation or upsetting, the corners of the side surfaces are forged to form a plane, and then the plane is placed into a furnace for heating.
In steps S5 to S8, the heating temperature is gradually decreased so that the grain size of the material gradually decreases after each upsetting or drawing to improve the mechanical properties of the material, and the heating temperature is gradually decreased to prevent the core temperature and the surface temperature from being excessively different, and the heating temperature is gradually decreased to 1050, which is about 100 ℃ higher than the eutectic line temperature of the material to prevent carbide precipitation, and the temperature is gradually decreased to prevent the core temperature and the surface temperature from being excessively different according to the forging requirement, so that carbide precipitation is prevented during the forging process due to temperature unevenness to affect the mechanical properties of the material.
Comparative example 1
The cylindrical ingot had a cross-sectional diameter of 760mm and a length of 1025mm, and the grade was the same as that of the cylindrical ingot in example 1. The forging process comprises the following steps of,
step S1, blanking of electroslag ingots;
step S2, discharging for upsetting by a first fire, wherein the forging ratio of the first upsetting is 1.5-1.8;
step S3, drawing out the steel tube from the furnace for the second time, wherein the forging ratio of the first drawing is 2.0-2.4;
step S4, discharging for upsetting, wherein the forging ratio of the second upsetting is 1.8-2.2;
step S5, drawing out the steel tube and drawing out the steel tube for the fourth time, wherein the forging ratio of the second drawing is 2.0-2.4, and returning the steel tube after upsetting the round head;
and step S6, replacing the upper flat anvil and the lower flat anvil by the fifth fire, and finally finishing into a cuboid structure of 680 x 660 x 1700 mm.
Comparative example 2
The cylindrical ingot had a cross-sectional diameter of 760mm and a length of 1025mm, and the grade was the same as that of the cylindrical ingot in example 1. The forging process comprises the following steps of,
step S1, annealing the cylindrical steel ingot subjected to electroslag remelting at 650 ℃, preserving heat for 30 hours, cooling to 300 ℃ along with the furnace, taking out, air-cooling to room temperature, and then sawing off waste materials at two ends of the cylindrical steel ingot; then putting the mixture into a furnace for heating, wherein the heating temperature is 1180 ℃, the heating rate is controlled at 80 ℃/h, and the heat preservation is carried out for 18 h;
step S2, carrying out primary drawing treatment, wherein the forging ratio is 1.72, then putting the steel tube into a furnace for heating, the heating temperature is 1180 ℃, and keeping the temperature for 2 hours;
step S3, carrying out primary upsetting treatment, wherein the forging ratio is 1.93, then putting the blank into a furnace for heating, the heating temperature is 1150 ℃, and keeping the temperature for 2 hours;
step S4, second drawing, wherein the forging ratio is 2.25, and then the steel is placed into a furnace to be heated, the heating temperature is 1100 ℃, and the temperature is kept for 2 hours;
step S5, carrying out second upsetting treatment, wherein the forging ratio is 2.05, then putting the blank into a furnace for heating, the heating temperature is 1050 ℃, and the heat preservation time is controlled to be 1 h;
and step S6, replacing the upper and lower flat anvils, drawing the steel ingot, and finally finishing into a cuboid structure of 680 x 660 x 1700 mm.
In order to verify the mechanical properties of the hot die steel provided by the forging method of the invention, the inventors sampled the products obtained in example 1, comparative example 1 and comparative example 2 at a position 100mm below the end face after conditioning treatment, and performed electron microscope scanning and mechanical property detection, wherein the mechanical property detection data are shown in table 1;
TABLE 1
As can be seen from table 1, the mechanical properties of the product of example 1 are all significantly improved in comparison.
As can be seen from the graphs in FIGS. 3 and 4, in the metallographic photos of the products in the comparative examples 1 and 2, the phenomenon of metal mixing is obvious, and the grain sizes are different from 2 to 6 levels; as can be seen from FIGS. 5 and 6, the grain size of the product prepared in example 1 is 5-6 grade, the grain size is fine, and the structure is uniform.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited thereto, and that various changes and modifications may be made without departing from the spirit of the invention, and the scope of the invention is defined in the appended claims.
Claims (9)
1. A forging method of a petroleum valve block for a fracturing pump is characterized by mainly comprising the following steps:
s1, annealing the cylindrical steel ingot subjected to electroslag remelting at the annealing temperature of 620-670 ℃ for 25-40 h, cooling the cylindrical steel ingot to 300 ℃ along with the furnace, taking out the cylindrical steel ingot, air-cooling the cylindrical steel ingot to room temperature, putting the cylindrical steel ingot into the furnace, continuously heating the cylindrical steel ingot at the heating temperature of 1150-1180 ℃, controlling the heating rate at 60-80 ℃/h, and keeping the temperature for 13-18 h, wherein the grade of the raw material of the cylindrical steel ingot is 17-4 PH;
s2, horizontally placing the cylindrical steel ingot processed in the step S1 on a lower flat anvil, clamping one end of the cylindrical steel ingot through a clamping device, rotating the cylindrical steel ingot, and simultaneously pressing the surface of the cylindrical steel ingot downwards by using the upper flat anvil and the lower flat anvil until the side surface of the cylindrical steel ingot is changed into an N-shaped side from a round side, wherein N is more than or equal to 4;
s3, obliquely placing the steel ingot processed in the step S2 on a lower flat anvil in the vertical direction through a clamping device, pressing the edge of the upper end of the steel ingot downwards by using an upper flat anvil, simultaneously rotating the steel ingot along the axis of the steel ingot until annular planes are formed at the edges of two ends of the steel ingot, placing the two ends of the steel ingot into a drum shape, heating the steel ingot in a furnace at 1150-1180 ℃, and controlling the heating rate at 60-80 ℃/h;
s4, vertically placing the steel ingot processed in the step S3 on a lower flat anvil, forging the end part of the steel ingot until annular planes at two ends of the steel ingot disappear, then placing the steel ingot into a furnace for heating, wherein the heating temperature is 1150-1180 ℃, the heating rate is controlled to be 60-80 ℃/h, and the heat preservation time is more than or equal to 2 h;
s5, carrying out primary drawing treatment, wherein the forging ratio is 1.4-1.8, then putting the steel plate into a furnace for heating, the heating temperature is 1120-1180 ℃, and the heat preservation time is more than or equal to 2 hours;
s6, carrying out primary upsetting treatment, wherein the forging ratio is 1.8-2.2, then putting the blank into a furnace for heating, the heating temperature is 1100-1150 ℃, and the heat preservation time is more than or equal to 2 hours;
s7, second drawing, wherein the forging ratio is 2.0-2.4, and then the steel is placed into a furnace to be heated, the heating temperature is 1060-11100 ℃, and the heat preservation time is more than or equal to 2 hours;
s8, carrying out secondary upsetting treatment, wherein the forging ratio is 1.8-2.2, then putting the blank into a furnace for heating, the heating temperature is 1010-1060 ℃, and the heat preservation time is controlled to be 0.5-1 h;
and S9, replacing the upper and lower flat anvils, drawing the steel ingot, and finally finishing and forming.
2. The forging method of the petroleum valve block for the fracturing pump according to claim 1, wherein the heating to 1150-1180 ℃ in step S1 is divided into three stages: respectively a first temperature rise stage and a first heat preservation stage; a second temperature rise stage and a second heat preservation stage; a third temperature rise stage and a third heat preservation stage;
wherein the first temperature rise stage and the first heat preservation stage are that the temperature is raised from room temperature to the first heat preservation temperature of 350 +/-10 ℃ at the temperature rise rate of 60 ℃/h, and the temperature is preserved for 5 h;
the second temperature rise stage and the second heat preservation stage are that the temperature is raised from the first heat preservation temperature to the second heat preservation temperature of 850 +/-10 ℃ at the temperature rise rate of 70 ℃/h, and the temperature is preserved for 6 h;
and the third temperature rise stage and the third heat preservation stage are that the temperature is raised from the second heat preservation temperature to the third heat preservation temperature of 1150-1180 ℃ at the temperature rise rate of 80 ℃/h, and the temperature is preserved for 13-18 h.
3. The forging method of the oil valve block for the fracturing pump according to claim 1, wherein in the step S1, the annealing temperature is 650 ℃, the temperature is kept for 30 hours, the oil valve block is taken out along with furnace cooling to 300 ℃, and the oil valve block is taken out and air-cooled to the room temperature.
4. The forging method of the oil valve block for the fracturing pump according to claim 1, wherein in the step S1, the heating temperature is 1180 ℃, and the temperature is kept at 18 ℃; in S3, heating at 1180 ℃ and keeping the temperature for 18 h; in S4, heating at 1180 ℃ and keeping the temperature for 2 hours; in S5, heating at 1180 ℃ and keeping the temperature for 2 hours; in S6, heating at 1150 ℃ and keeping the temperature for 2 h; in S7, heating at 1100 deg.C, and maintaining for 2 h; in S8, the heating temperature is 1050 ℃, and the temperature is kept for 1 h.
5. The forging method of the oil valve block for the fracturing pump according to claim 1, wherein in the step S1, after the annealing treatment, scraps at both ends of the cylindrical steel ingot are sawed off and put into a furnace for heating.
6. The forging method of the oil valve block for the fracturing pump according to claim 1, wherein in step S2, the clamping device clamps one end of the cylindrical steel ingot, the upper and lower flat anvils are used for pressing the surface of the electroslag ingot, the cylindrical surface is pressed at first to form two planes, then the two planes are rotated by 90 degrees to be pressed into a quadrangle, then the two planes are rotated by 45 degrees, the upper flat anvil is pressed downwards and then rotated by 90 degrees, the upper flat anvil presses the steel ingot into an octagon, and finally the side corners of the octagon steel ingot are blunted.
7. The forging method of the oil valve block for the fracturing pump according to claim 6, wherein in the step S2, the reduction amount is controlled to be 30-40mm each time.
8. The forging method of the oil valve block for the fracturing pump according to claim 1, wherein in the steps S5 to S8, after each elongation or upsetting, the corners of the side surfaces are forged until the flat surfaces are formed, and then the forging method is put into a furnace for heating.
9. The forging method of the oil valve block for the fracturing pump according to claim 1, wherein in step S5, the forging ratio of the first drawing process is 1.72; in step S6, the forging ratio of the first upsetting process is 1.93; in step S7, the forging ratio of the second drawing process is 2.25; in step S8, the forging ratio of the second upsetting process is 2.05.
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