CN113579139A - Forging method of high-performance bearing steel ball blank - Google Patents
Forging method of high-performance bearing steel ball blank Download PDFInfo
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- CN113579139A CN113579139A CN202110908730.1A CN202110908730A CN113579139A CN 113579139 A CN113579139 A CN 113579139A CN 202110908730 A CN202110908730 A CN 202110908730A CN 113579139 A CN113579139 A CN 113579139A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J3/00—Lubricating during forging or pressing
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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
- B21K1/02—Making machine elements balls, rolls, or rollers, e.g. for bearings
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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
- B21K27/00—Handling devices, e.g. for feeding, aligning, discharging, Cutting-off means; Arrangement thereof
- B21K27/02—Feeding devices for rods, wire, or strips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention discloses a forging method of a high-performance bearing steel ball blank, and belongs to the field of steel ball part forging. The invention aims to solve the problems that the existing forging technology is difficult to solve the problems that a large amount of flow lines at two poles of a ball blank and flashes are exposed, and the sizes of the flashes cannot be controlled. Compared with the prior art, the invention adds pre-forging and lubrication on the basis of blanking, heating and forging, and adopts the following steps: firstly, blanking; secondly, pre-forging; and thirdly, finish forging. The forging method is used for forging the ball blank of the bearing steel ball.
Description
Technical Field
The invention belongs to the field of steel ball part forging.
Background
The bearing steel ball is used as a mechanical basic component and is widely applied to various fields of automobiles, high-speed rails, wind power, precision machine tools, aerospace and the like. The ball blank forming is used as a central link for manufacturing the steel ball, and the forming process of the ball blank has great influence on the organization structure and streamline distribution of the steel ball. The forming process of the ball blank can be generally divided into two main categories of forging and skew rolling. The skew rolling is easy to cause looseness and holes in the core due to the Manchester effect of the process, and is not suitable for manufacturing high-end bearing steel balls. The steel ball obtained by forging has the characteristics of compact structure, no core looseness and the like, and is a main processing mode of high-end bearing steel balls.
The existing forging process needs to cut off a round bar material to obtain a cylindrical section blank with equal length, and the cylindrical section blank is directly forged and formed to obtain a ball blank. In the deformation process, the fins are often generated firstly, and the metal is fully filled in the upper cavity and the lower cavity under the resistance action of the fins to form two electrodes. Therefore, the process cannot effectively control the size of the flash, and the size of the ball blank flash is too large, so that the workload of subsequent finish machining is increased, and the production efficiency is reduced. In addition, two polar regions of the ball blank are formed by the upper end surface and the lower end surface of the original cylindrical blank, and the streamline of the original end surface is exposed, so that the streamline of the region is always vertical to the surface of the ball blank, and the streamline is exposed; the machining of the flash portion also causes the flow lines in this area to be cut, resulting in the appearance of flow line outcrops. A large amount of outcrops of the streamline often cause the corrosion resistance and the fatigue resistance of the bearing steel ball to be reduced, and the service life of the steel ball is influenced.
Disclosure of Invention
The invention provides a forging method of a high-performance bearing steel ball blank, aiming at solving the problems that the existing forging technology is difficult to solve the problems that a large amount of flow lines at two poles and flashes of the ball blank are exposed and the sizes of the flashes cannot be controlled.
A forging method of a high-performance bearing steel ball blank is carried out according to the following steps:
firstly, blanking:
cutting a round bar to obtain a cylindrical section, grinding the upper end surface and the lower end surface of the cylindrical section to ensure that the length of the section is within a tolerance range, chamfering the upper end surface and the lower end surface to obtain a processed section, heating the processed section to 900-1100 ℃, and preserving heat to obtain a heated section;
the chamfer angle is half of the taper angle in the tapered pre-forging die cavity in the step two; the mass of the processed material section is equal to that of the ball blank of the bearing steel ball prepared in the step three;
secondly, pre-forging:
before pre-forging, smearing a lubricant inside a tapered pre-forging die cavity, setting the pre-forging pressing amount of a hot forging machine, quickly transferring the heated material section into the tapered pre-forging die cavity, attaching the chamfered side face of the material section to the inner wall of the tapered pre-forging die cavity when placing, and performing pre-forging forming by adopting the hot forging machine to obtain a pre-forged blank;
the taper angle in the tapered pre-forging die cavity is 30-60 degrees; the reduction in the pre-forging forming process is 20-35% of the height of the material section processed in the step one; the pre-forged blank is a cylindrical blank with the upper end surface and the lower end surface in a circular truncated cone shape;
thirdly, finish forging:
before finish forging, smearing a lubricant in the cavity of the spherical die, and setting the finish forging reduction of a hot forging machine to ensure that the height of the flash of the ball blank of the bearing steel ball is less than 2.2 percent of the diameter of the ball blank of the bearing steel ball; and (3) quickly transferring the pre-forged blank into a spherical die cavity for finish forging to obtain a bearing steel ball blank, namely completing the forging method of the high-performance bearing steel ball blank.
The invention has the beneficial effects that:
the invention sets the preforging process in the steel ball forging process, on one hand, the surface area of the upper and lower end surfaces of the material section is obviously reduced, thereby effectively reducing the streamline outcrop area at the two poles of the ball blank after the finish forging forming, on the other hand, the indent of the upper and lower end surfaces of the preforging blank promotes the metal to flow to the center in the finish forging process, further reducing the area of the streamline outcrop area, reducing the included angle between the metal streamline of the streamline outcrop area and the surface of the ball blank, thereby optimizing the streamline distribution condition of the two pole areas.
The invention changes the shape of the blank through the pre-forging process, thereby changing the filling sequence of metal in the finish forging forming process, avoiding the tendency of forming at the position of the flash in the prior art, effectively reducing the size of the flash, and controlling the height of the flash of the ball blank of the bearing steel ball to be less than 2.2 percent of the diameter of the ball blank.
The invention can reduce the size of the flash, improve the appearance of the streamline outcrop at the two poles of the ball blank, keep the steel ball blank in a better forging streamline, greatly improve the fatigue resistance of the bearing steel ball blank and prolong the service life.
The invention relates to a forging method for a high-performance bearing steel ball blank.
Drawings
FIG. 1 is a schematic flow chart of a forging method of a ball blank of a high-performance bearing steel ball according to the present invention, wherein (a) is blanking in step one, (b) is pre-forging in step two, and (c) is finish forging in step three;
FIG. 2 is a schematic diagram of the dimension of the processed material section prepared in step one of the present invention, wherein L is the length, d is the diameter, c is the chamfer height,
is a chamfer angle;
FIG. 3 is a schematic view of the taper angle and the rolling reduction of the tapered pre-forging die cavity in the pre-forging process of step two of the present invention;
FIG. 4 is a three-dimensional schematic view of a tapered pre-forging die according to step two of the present invention;
FIG. 5 is a schematic three-dimensional view of a pre-forged blank made in step two of the present invention;
FIG. 6 is a three-dimensional schematic view of a spherical mold according to step three of the present invention;
FIG. 7 is a three-dimensional schematic view of a high-performance bearing steel ball blank prepared in step three of the present invention;
FIG. 8 is a schematic diagram showing the change in metal flow lines in the forging of a high performance ball bearing steel ball blank according to an example of the present invention, wherein (a) is a processed billet prepared in step one, (b) is a pre-forged blank prepared in step two, and (c) is a high performance ball bearing steel ball blank prepared in step three;
FIG. 9 is a schematic diagram of material object and flow line of a bearing steel ball blank prepared by a conventional forging process in a comparative experiment, wherein (a) shows the appearance of the material object flow line, (B) shows the appearance of the simulated flow line, A shows the exposed area, and B shows the flash;
FIG. 10 is a schematic diagram of a material object and a streamline of a high-performance bearing steel ball blank prepared in the third step of the embodiment, where (a) is a material object streamline morphology, (B) is a simulated streamline morphology, A is an exposed area, and B is a flash.
Detailed Description
The technical solution of the present invention is not limited to the specific embodiments listed below, and includes any combination of the specific embodiments.
The first embodiment is as follows: specifically, referring to fig. 1 to 7, the forging method of the high-performance bearing steel ball blank according to the present embodiment is performed according to the following steps:
firstly, blanking:
cutting a round bar to obtain a cylindrical section, grinding the upper end surface and the lower end surface of the cylindrical section to ensure that the length of the section is within a tolerance range, chamfering the upper end surface and the lower end surface to obtain a processed section, heating the processed section to 900-1100 ℃, and preserving heat to obtain a heated section;
the chamfer angle is half of the taper angle in the tapered pre-forging die cavity in the step two; the mass of the processed material section is equal to that of the ball blank of the bearing steel ball prepared in the step three;
secondly, pre-forging:
before pre-forging, smearing a lubricant inside a tapered pre-forging die cavity, setting the pre-forging pressing amount of a hot forging machine, quickly transferring the heated material section into the tapered pre-forging die cavity, attaching the chamfered side face of the material section to the inner wall of the tapered pre-forging die cavity when placing, and performing pre-forging forming by adopting the hot forging machine to obtain a pre-forged blank;
the taper angle in the tapered pre-forging die cavity is 30-60 degrees; the reduction in the pre-forging forming process is 20-35% of the height of the material section processed in the step one; the pre-forged blank is a cylindrical blank with the upper end surface and the lower end surface in a circular truncated cone shape;
thirdly, finish forging:
before finish forging, smearing a lubricant in the cavity of the spherical die, and setting the finish forging reduction of a hot forging machine to ensure that the height of the flash of the ball blank of the bearing steel ball is less than 2.2 percent of the diameter of the ball blank of the bearing steel ball; and (3) quickly transferring the pre-forged blank into a spherical die cavity for finish forging to obtain a bearing steel ball blank, namely completing the forging method of the high-performance bearing steel ball blank.
The chamfering angle in the first step is half of the angle of the taper angle in the tapered pre-forging die cavity in the second step, when the material section is placed, the side face of the chamfering is attached to the inner wall of the tapered cavity, and the height of the chamfering is 0.5-1 mm, so that on one hand, the bar can be stably placed in the lower die cavity in the pre-forging forming process, and on the other hand, the metal in the chamfering area still has the radial flowing trend, and the phenomenon that the streamline of the metal in the chamfering area is perpendicular to the surface of the pre-forging die in the pre-forging forming process, and a large amount of streamline outcrop exists on the side surfaces of the upper round table and the lower round table of the material section obtained by pre-forging, so that the phenomenon that a large amount of streamline outcrop appears in the extreme area of a finish-forged ball blank is caused.
And the taper angle in the tapered pre-forging die cavity in the step two is 30-60 degrees, so that the material section metal is ensured to flow radially inwards in the pre-forging process. When the taper angle is too small, the diameter variation of the round table at the end part of the preforging rod is small, and the streamline end-exposing phenomenon is not obviously improved; when the taper angle is too large, the flow lines and the outcrops are easily generated on the side surfaces of the upper and lower round tables.
In the second step, the areas of the upper end surface and the lower end surface can be reduced by pre-forging, and the area of a streamline outcrop area is reduced; and the center of the end surface is concave, thereby changing the flowing direction of the metal in the finish forging forming process.
And step three, during finish forging forming, since the upper end and the lower end of the bar stock are provided with the circular truncated cones through preforging, the filling sequence of metal in the finish forging forming process is changed, the metal is preferentially filled in the spherical finish forging spherical die cavity and then forms the flash, and when the die stroke is not changed, the mass of the blank is reduced, so that the metal at the flash is reduced, and the size of the flash is reduced.
And step three, when the final forging is carried out, because the inside of the cavity of the die is coated with the lubricant, the metal fluidity is increased, in addition, the upper end surface and the lower end surface of the bar material are inwards concave due to the preforging blank, and under the action of the spherical cavity, the metal at the end part flows to the center, so that the metal outcrop phenomenon at the two poles is reduced.
And step three, the steel ball blank with smaller ball blank flash size and less metal streamline outcrop at two poles can be obtained by final forging.
The beneficial effects of the embodiment are as follows:
in the embodiment, the pre-forging process is arranged in the steel ball forging process, so that the surface areas of the upper end surface and the lower end surface of the material section are obviously reduced, the streamline outcrop areas at the two poles of the ball blank after final forging forming are effectively reduced, the inward concavities of the upper end surface and the lower end surface of the pre-forged blank promote metal to flow towards the center in the final forging process, the area of the streamline outcrop areas is further reduced, the included angle between the metal streamline of the streamline outcrop areas and the surface of the ball blank is reduced, and the streamline distribution condition of the two pole areas is optimized.
The preforging process of the embodiment changes the shape of the blank, thereby changing the filling sequence of metal in the finish forging forming process, avoiding the tendency of forming at the position of the flash in the prior art, effectively reducing the size of the flash, and controlling the height of the flash of the ball blank of the bearing steel ball to be less than 2.2 percent of the diameter of the ball blank.
The embodiment can reduce the size of the flash, improve the appearance of the streamline outcrop at the two poles of the obtained ball blank, keep the better forging streamline of the steel ball blank, greatly improve the fatigue resistance of the bearing steel ball blank and prolong the service life.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: and grinding the upper end face and the lower end face of the cylindrical material section in the first step to enable the length tolerance between the upper end face and the lower end face to be within 0.1 mm. The rest is the same as the first embodiment.
The third concrete implementation mode: this embodiment is different from the first or second embodiment in that: the round bar material in the step one is bearing steel 8Cr4Mo 4V. The other is the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the height of the chamfer angle in the step one is 0.5 mm-1 mm. The others are the same as the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the height-diameter ratio of the cylindrical material section in the first step is (1.85-2.15): 1. The rest is the same as the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: in the first step, the processed material section is heated to 900-1100 ℃ and is kept warm for 30-80 min. The rest is the same as the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: and in the second step, under the condition that the transfer time is 3-7 s, the heated material section is quickly transferred into the tapered preforging die cavity. The others are the same as the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: and in the third step, under the condition that the transfer time is 3-7 s, the pre-forged blank is quickly transferred into the spherical die cavity for finish forging. The rest is the same as the first to seventh embodiments.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: the spherical mold cavity in the fourth step is spherical. The other points are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the present embodiment differs from one of the first to ninth embodiments in that: the diameter of the pole hole is 6 mm-8 mm. The other points are the same as those in the first to ninth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
the first embodiment is as follows:
a forging method of a high-performance bearing steel ball blank is carried out according to the following steps:
firstly, blanking:
cutting a round bar to obtain a cylindrical material section, grinding the upper end surface and the lower end surface of the cylindrical material section to ensure that the length of the material section is within a tolerance range, chamfering the upper end surface and the lower end surface to obtain a processed material section, heating the processed material section to 930 ℃, and preserving heat for 30min to obtain a heated material section;
the chamfer angle is half of the taper angle in the tapered pre-forging die cavity in the step two,
is 25 degrees; the mass of the processed material section is equal to that of the ball blank of the bearing steel ball prepared in the step three, and specifically 64.54 g;
secondly, pre-forging:
before pre-forging, smearing a lubricant inside a tapered pre-forging die cavity, setting the pre-forging pressing amount of a hot forging machine, quickly transferring the heated material section into the tapered pre-forging die cavity, attaching the chamfered side face of the material section to the inner wall of the tapered pre-forging die cavity when placing, and performing pre-forging forming by adopting the hot forging machine to obtain a pre-forged blank;
the taper angle in the tapered pre-forging die cavity is 50 degrees; the reduction in the pre-forging forming process is 28% of the height of the material section processed in the step one; the pre-forged blank is a cylindrical blank with the upper end surface and the lower end surface in a circular truncated cone shape;
thirdly, finish forging:
before finish forging, smearing a lubricant in the cavity of the spherical die, and setting the finish forging reduction of a hot forging machine to ensure that the height of the flash of the ball blank of the bearing steel ball is less than 2.2 percent of the diameter of the ball blank of the bearing steel ball; and (3) quickly transferring the pre-forged blank into a spherical die cavity for finish forging to obtain a bearing steel ball blank, namely completing the forging method of the high-performance bearing steel ball blank.
The round bar material in the step one is bearing steel 8Cr4Mo 4V.
And grinding the upper end face and the lower end face of the cylindrical material section in the first step to enable the length tolerance between the upper end face and the lower end face to be within 0.1 mm.
The chamfer height c in the step one is 0.5 mm.
And in the first step, cutting a round bar according to the size of the steel ball part, wherein the diameter of the ball blank of the bearing steel ball prepared in the third step is 23.6mm, the diameter d of the processed material section is 16.5mm, and the height L is 34.2 mm.
And step two, adopting a closed single-point press machine to perform pre-forging forming, and quickly transferring the heated material section into a tapered pre-forging die cavity under the condition that the transfer time is 6 s.
In the second step, the pressing amount in the pre-forging forming process is 28 percent (9.6mm) of the height of the material section processed in the first step, and the height of the prepared pre-forging blank is specifically 24.6 mm.
And in the third step, a closed single-point press is adopted for final forming, and the pre-forged blank is quickly transferred to the spherical die cavity for final forging under the condition that the transfer time is 6 s.
And in the third step, the spherical mold cavity is spherical, the diameter of the polar hole is 8mm, and the metal filling condition is judged by observing the sizes of two poles of the forged ball blank and whether flash is generated.
And step three, ensuring that the height of the flange of the ball blank of the bearing steel ball is less than 2.2 percent of the diameter of the ball blank of the bearing steel ball, specifically ensuring that the height of the flange of the ball blank is less than 0.5 mm.
The cone angle in the lower die cavity of the conical pre-forging die in the step two is 50 degrees, so that the metal of the material section is ensured to flow radially inwards in the pre-forging process, the areas of the upper end surface and the lower end surface of the material section are reduced, and the phenomenon of streamline outcrop at the two electrodes is reduced; the phenomenon that the size of the flash is too large due to the fact that the metal forms the flash first and then fills the cavity is avoided, and therefore the flash is reduced.
FIG. 8 is a schematic diagram showing the change in metal flow lines in the forging of a high performance ball bearing steel ball blank according to an example of the present invention, wherein (a) is a processed billet prepared in step one, (b) is a pre-forged blank prepared in step two, and (c) is a high performance ball bearing steel ball blank prepared in step three; as can be seen from the figure, after the original bar stock streamline is subjected to pre-forging, the streamline of the upper end surface and the streamline of the lower end surface are concave, and the streamline is in a closed trend after final forging, so that the streamline outcrop at the two positions is greatly reduced.
Comparison experiment one: the comparative experiment differs from the first example in that: and (4) omitting a lubricating process, chamfering in the step one and pre-forging in the step two, and directly performing finish forging on the bar stock to form a ball blank. The rest is the same as the first embodiment.
FIG. 9 is a schematic diagram of material object and flow line of a bearing steel ball blank prepared by a conventional forging process in a comparative experiment, wherein (a) shows the appearance of the material object flow line, (B) shows the appearance of the simulated flow line, A shows the exposed area, and B shows the flash; FIG. 10 is a schematic diagram of the material object and the flow line of the high performance bearing steel ball blank prepared in the third step of the embodiment, where (a) is the material object flow line morphology, (B) is the simulated flow line morphology, A is the outcrop area, and B is the flash. As can be seen from the figure, through the improved forging forming method, the area of the streamline outcrop area of the two polar areas of the ball blank is reduced by 45%, and the included angle between the streamline of the outcrop area and the surface of the ball blank is reduced; meanwhile, the size of the flash (less than 0.5mm) is greatly reduced, almost no flash exists, and the metal flow line is distributed along the surface of the ball blank.
Claims (10)
1. A forging method of a high-performance bearing steel ball blank is characterized by comprising the following steps:
firstly, blanking:
cutting a round bar to obtain a cylindrical section, grinding the upper end surface and the lower end surface of the cylindrical section to ensure that the length of the section is within a tolerance range, chamfering the upper end surface and the lower end surface to obtain a processed section, heating the processed section to 900-1100 ℃, and preserving heat to obtain a heated section;
the chamfer angle is half of the taper angle in the tapered pre-forging die cavity in the step two; the mass of the processed material section is equal to that of the ball blank of the bearing steel ball prepared in the step three;
secondly, pre-forging:
before pre-forging, smearing a lubricant inside a tapered pre-forging die cavity, setting the pre-forging pressing amount of a hot forging machine, quickly transferring the heated material section into the tapered pre-forging die cavity, attaching the chamfered side face of the material section to the inner wall of the tapered pre-forging die cavity when placing, and performing pre-forging forming by adopting the hot forging machine to obtain a pre-forged blank;
the taper angle in the tapered pre-forging die cavity is 30-60 degrees; the reduction in the pre-forging forming process is 20-35% of the height of the material section processed in the step one; the pre-forged blank is a cylindrical blank with the upper end surface and the lower end surface in a circular truncated cone shape;
thirdly, finish forging:
before finish forging, smearing a lubricant in the cavity of the spherical die, and setting the finish forging reduction of a hot forging machine to ensure that the height of the flash of the ball blank of the bearing steel ball is less than 2.2 percent of the diameter of the ball blank of the bearing steel ball; and (3) quickly transferring the pre-forged blank into a spherical die cavity for finish forging to obtain a bearing steel ball blank, namely completing the forging method of the high-performance bearing steel ball blank.
2. The forging method for the ball blank of the high-performance bearing steel ball as claimed in claim 1, wherein the upper and lower end faces of the cylindrical material section are ground in the first step so that the length tolerance between the upper and lower end faces is within 0.1 mm.
3. The forging method for the ball blank of the high-performance bearing steel ball as claimed in claim 1, wherein the round bar material in the first step is bearing steel 8Cr4Mo 4V.
4. The forging method for the ball blank of the high-performance bearing steel ball as claimed in claim 1, wherein the chamfer height in the first step is 0.5 mm-1 mm.
5. The forging method of the ball blank of the high-performance bearing steel ball as claimed in claim 1, wherein the height-diameter ratio of the cylindrical material section in the step one is (1.85-2.15): 1.
6. The forging method of the ball blank of the high-performance bearing steel ball as claimed in claim 1, wherein the material section after processing is heated to 900-1100 ℃ and kept warm for 30-80 min in the first step.
7. The forging method of the ball blank of the high-performance bearing steel ball as claimed in claim 1, wherein in the second step, the heated material section is rapidly transferred to the tapered pre-forging die cavity under the condition that the transfer time is 3-7 s.
8. The forging method of the ball blank of the high-performance bearing steel ball as claimed in claim 1, wherein in the third step, the pre-forged blank is rapidly transferred to the cavity of the ball-shaped die for finish forging under the condition that the transfer time is 3-7 s.
9. The forging method for the ball blank of the high-performance bearing steel ball as claimed in claim 1, wherein the spherical mold cavity in the third step is spherical.
10. The forging method for the ball blank of the high-performance bearing steel ball as claimed in claim 9, wherein the diameter of the pole hole is 6 mm-8 mm.
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| CN114054665A (en) * | 2021-11-22 | 2022-02-18 | 中国航发哈尔滨轴承有限公司 | BG801 steel ball forging method |
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| CN113579139B (en) | 2022-07-01 |
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