A wear-resistant and high-temperature-resistant grinding ring for a steel ball rounding machine and a heat treatment process thereof

Abstract

The application belongs to the technical field of steel ball rounding machine, especially a wear-resistant and high-temperature-resistant grinding ring for a steel ball rounding machine and a heat treatment process thereof. The present application is proposed in view of the problem that the high-temperature resistance and wear resistance of the rotating grinding ring of the steel ball rounding machine cannot meet the use requirements. The present application comprises a rotating grinding ring, an outer surface of one end of the rotating grinding ring is provided with a ball rolling groove, an inner surface of the rotating grinding ring is provided with a lubricating groove, and the outer surfaces of both ends of the rotating grinding ring are provided with outwardly extending reinforcing rings. The present application can effectively improve the high-temperature resistance of the rotating grinding ring by selecting a high-temperature-resistant alloy steel material to prepare the rotating grinding ring and coating the rotating grinding ring with a high-temperature-resistant and oxidation-resistant coating. Furthermore, the present application can greatly improve the high-temperature resistance and wear resistance of the rotating grinding ring by subjecting the rotating grinding ring to quenching and tempering heat treatment and twice backfire dispersion hardening heat treatment, thereby realizing multiple heat treatments of the rotating grinding ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel ball rounding machine, and particularly relates to a wear-resistant and high-temperature-resistant grinding ring for a steel ball rounding machine and a heat treatment process thereof. BACKGROUND

[0002] The production process types of grinding balls mainly include forging and casting, wherein the production of forged grinding balls has the following modes:

[0003] 1. Air hammer semi-die forging: steel bar stock is cut in a cold state, heated in a heating furnace, and then forged into shape by multiple actions in the die of an air hammer. This mode has many operation links, high labor intensity, and low production efficiency;

[0004] 2. Press top forging: steel bar stock is cut in a cold state, heated in a heating furnace, and then extruded into shape by 1 or 2-3 times of stamping action by a mechanical device into a press die. This mode reduces labor intensity and has high production efficiency, but the ball shape is slightly poor;

[0005] 3. Roll forging machine rolling: steel bar stock is cut in a cold state, heated in a heating furnace, and then formed by a roll forging machine. Compared with the air hammer semi-die forging mode, this mode has improved yield and quality, but the quality is unstable due to the influence of equipment and human factors, and the production cost is high;

[0006] 4. Rotary cutting and roll forging machine rolling: steel round bar stock is heated in a heating furnace and then rolled into a ball by a rotary cutting and roll forging machine through three main processes of cutting, forming and rounding. Generally, one steel ball is produced per revolution of the roll. This mode has high production efficiency and guaranteed surface quality of the produced grinding balls, but there is still potential for further improvement in yield and heat treatment effect.

[0007] The prior art patent CN212216936U discloses a steel ball rounding machine. The steel ball rounding machine is driven by a motor, and a complete steel ball rolling track is formed by a left half steel ball rolling track arranged on the inner side of a fixed die and a right half steel ball rolling track arranged on the outer side of a movable die, so as to realize the rounding treatment of the steel ball. The movable die continuously rotates under the driving of the motor. When the steel ball is rounded by the steel ball rolling track, the high-temperature resistance and wear resistance of the movable die are reduced, thereby affecting the quality of the rounding treatment of the steel ball.

[0008] Therefore, there is a need for a wear-resistant and high-temperature-resistant grinding ring for a steel ball rounding machine and a heat treatment process thereof to solve the problem that the high-temperature resistance and wear resistance of the rotating grinding ring of the steel ball rounding machine cannot meet the use requirements. SUMMARY

[0009] The wear-resistant and high-temperature-resistant grinding ring for a steel ball rounding machine and the heat treatment process thereof solve the above problems.

[0010] In order to achieve the above object, the application adopts the following technical scheme: A wear-resistant and high-temperature-resistant grinding ring of a steel ball rounding machine, comprising a rotating grinding ring, an outer surface of one end of the rotating grinding ring is provided with a ball rolling ring groove, an inner surface of the rotating grinding ring is provided with a lubricating groove, outer surfaces of both ends of the rotating grinding ring are provided with outwardly extending reinforcing rings, an installation area is arranged between the two reinforcing rings, an oil injection hole penetrating through the lubricating groove is arranged in the inside of the installation area, a fastening bolt is threadedly connected to the inner wall of the oil injection hole, two symmetrically distributed splicing rings are arranged in the inside of the installation area, the outer surfaces of the two splicing rings are in abutting arrangement with the outer surfaces of the reinforcing rings, and a butt joint sleeve ring is detachably connected to the end face of the rotating grinding ring away from the ball rolling ring groove.

[0011] It should be noted in the scheme that the inner wall of the butt joint sleeve ring is provided with an inwardly extending convex ring, and the outer surface of the end of the rotating grinding ring away from the ball rolling ring groove is provided with an annular embedding groove matched with the convex ring.

[0012] It should be further noted that the outer surfaces of the two splicing rings are provided with a plurality of equiangularly distributed through holes, and both outer ends of each through hole are provided with a heat dissipation channel formed in the outer surface of the butt joint sleeve ring.

[0013] Finally, it should be noted that the inner surface of the rotating grinding ring is provided with a plurality of oil storage grooves in communication with the lubricating groove, and each oil storage groove is in a runway shape.

[0014] A heat treatment process of a wear-resistant and high-temperature-resistant grinding ring of a steel ball rounding machine, comprising the following steps:

[0015] S1, forming treatment: selecting a high-temperature-resistant alloy steel material, heating and melting it, adding pig iron or graphite to increase carbon, mixing and heating and melting into molten steel to form a new heat-resistant alloy material, and forming a rotating grinding ring, a splicing ring and a butt joint sleeve ring after molding;

[0016] S2, cleaning, drying and coating treatment: placing the rotating grinding ring, the splicing ring and the butt joint sleeve ring obtained by molding in step S1 together in a cleaning machine to clean the surface of each ring, drying the rings in a drying machine after cleaning, and coating a layer of high-temperature-resistant and anti-oxidation coating on each surface of the rotating grinding ring after drying;

[0017] S3, quenching and tempering heat treatment: sending the rotating grinding ring in step S2 into a heating furnace, adjusting the heating temperature to 680-740 DEG C for preheating and uniform heating, keeping the temperature for 1-2 hours and then air cooling to room temperature, continuing to heat to 1050-1120 DEG C, keeping the temperature for 2-3 hours, and then furnace cooling to room temperature to complete the quenching and tempering heat treatment of the rotating grinding ring;

[0018] S4, tempering dispersion hardening heat treatment: the quenched and tempered heat treatment rotating grinding ring, splicing ring and butt joint ring is carried out twice tempering dispersion hardening heat treatment, wherein the first tempering temperature is 420-480 DEG C, and the temperature is kept for 1-1.5 h, and the air cooling is carried out to room temperature, the second tempering temperature is 510-580 DEG C, and the temperature is kept for 1-1.5 h, and the air cooling is carried out to room temperature, and the heat treatment of the rotating grinding ring, the splicing ring and the butt joint ring is completed.

[0019] As a preferred embodiment, the heat treatment furnace adopts a heat treatment electric furnace with nitrogen protection.

[0020] As a preferred embodiment, the high-temperature-resistant and oxidation-resistant coating is an inorganic heat-resistant and oxidation-resistant ceramic paint.

[0021] As a preferred embodiment, the outer surface of the butt joint ring is subjected to frosted treatment, and the rotating grinding ring is subjected to immersion rust-proof treatment.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. The present application improves the lubricating performance of the rotating grinding ring to a certain extent by providing lubricating grooves and oil injection holes on the inner surface of the rotating grinding ring, and provides a butt joint ring at the outer end, which not only limits the two splicing rings, but also forms a closed treatment on the outer surface of the rotating grinding ring, thereby improving the protection performance of the rotating grinding ring during the rotating rounding process.

[0024] 2. The present application improves the high-temperature resistance of the rotating grinding ring by selecting a high-temperature-resistant alloy steel material and coating a high-temperature-resistant and oxidation-resistant coating thereon, and realizes multiple heat treatment of the rotating grinding ring by quenching and tempering heat treatment and twice tempering dispersion hardening heat treatment, thereby greatly improving the high-temperature resistance and wear resistance of the rotating grinding ring. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The present application provides a whole structure schematic diagram of a steel ball rounding machine wear-resistant and high-temperature-resistant grinding ring.

[0026] Figure 2 The present application provides a split structure schematic diagram of a steel ball rounding machine wear-resistant and high-temperature-resistant grinding ring.

[0027] Figure 3A steel ball rounding machine wear-resistant high-temperature-resistant grinding ring annular groove structure schematic diagram is provided for the application.

[0028] Figure 4 A steel ball rounding machine wear-resistant high-temperature-resistant grinding ring oil injection hole local structure schematic diagram is provided for the application.

[0029] In the figure: 1, rotating grinding ring; 2, rolling ball ring groove; 3, lubricating groove; 4, reinforcing ring; 5, installation area; 6, oil injection hole; 7, fastening bolt; 8, splicing ring; 9, butt joint sleeve ring; 10, convex ring; 11, annular groove; 12, through hole; 13, heat dissipation channel; 14, oil storage groove. DETAILED DESCRIPTION

[0030] REFERENCE Figures 1-4 A steel ball rounding machine wear-resistant high-temperature-resistant grinding ring, comprising a rotating grinding ring 1, one end of the rotating grinding ring 1 is provided with a rolling ball ring groove 2 on the outer surface, the inner surface of the rotating grinding ring 1 is provided with a lubricating groove 3, the outer surface of both ends of the rotating grinding ring 1 is provided with an outwardly extending reinforcing ring 4, the installation area 5 is provided between the two reinforcing rings 4, the inside of the installation area 5 is provided with an oil injection hole 6 penetrating through the lubricating groove 3, the inner wall of the oil injection hole 6 is threadedly connected with a fastening bolt 7, the inside of the installation area 5 is provided with two symmetrically distributed splicing rings 8, both of the two splicing rings 8 are in abutting arrangement with the outer surface of the reinforcing ring 4, the end of the rotating grinding ring 1 away from the rolling ball ring groove 2 is detachably connected with a butt joint sleeve ring 9, the inner surface of the butt joint sleeve ring 9 is in abutting arrangement with the outer surface of the two splicing rings 8, wherein the inner surface of the rotating grinding ring 1 is fixedly sleeved on the outer surface of the transmission shaft, and the rolling ball ring groove 2 and the rolling ball ring groove 2 on the fixed grinding ring form a rolling round groove for steel balls, so as to be used for rolling round processing of the steel balls.

[0031] Further, it is worth noting that the inner wall of the butt joint sleeve ring 9 is provided with an inwardly extending convex ring 10, the outer surface of the end of the rotating grinding ring 1 away from the rolling ball ring groove 2 is provided with an annular groove 11 matched with the convex ring 10, through the clamping arrangement of the convex ring 10 and the annular groove 11, the contact area of the butt joint sleeve ring 9 and the rotating grinding ring 1 is effectively improved, so as to further improve the installation stability of the butt joint sleeve ring 9 and the rotating sleeve ring.

[0032] Further, it is worth noting that the outer surface of the two splicing rings 8 is provided with a plurality of equiangularly distributed through holes 12, both outer ends of each through hole 12 are provided with a heat dissipation channel 13 opened on the outer surface of the butt joint sleeve ring 9, wherein the through hole 12 on the splicing ring 8 and the heat dissipation channel 13 on the butt joint sleeve ring 9 are in staggered distribution, which can improve the heat dissipation performance of the installation area 5 inside the rotating grinding ring 1 during the rotating processing, and to a certain extent, prolong the wear-resistant time effect of the rotating grinding ring 1 in long-term use.

[0033] Further, it is worth noting that the inner surface of the rotating grinding ring 1 is provided with a plurality of oil storage grooves 14 in communication with the lubricating grooves 3, each of which is arranged in a runway shape. The oil storage grooves 14 are arranged in communication with the lubricating grooves 3, which can effectively increase the contact area of the lubricating oil with the transmission shaft and improve the lubricating effect to a certain extent.

[0034] By arranging the lubricating grooves 3 and the oil injection holes 6 on the inner surface of the rotating grinding ring 1, the lubricating performance is improved to a certain extent. The abutting sleeve ring 9 arranged at the outer end not only limits the two splicing rings 8 but also forms a closed treatment on the outer surface of the rotating grinding ring 1, thereby improving the protection performance of the rotating grinding ring 1 during the rotating rounding process. In addition, the staggered distribution of the through holes 12 and the heat dissipation channels 13 effectively improves the heat dissipation performance of the rotating grinding ring 1 and prevents foreign matter from entering the installation area 5 of the rotating grinding ring 1 to a certain extent.

[0035] A heat treatment process for a wear-resistant and high-temperature-resistant grinding ring of a steel ball rounding machine, comprising the following steps:

[0036] S1, forming treatment: selecting a high-temperature-resistant alloy steel material, heating and melting it, adding pig iron or graphite to increase carbon, mixing and heating to form molten steel, and forming a new heat-resistant alloy material, which is molded into a rotating grinding ring 1, a splicing ring 8 and an abutting sleeve ring 9.

[0037] S2, cleaning, drying and coating treatment: the rotating grinding ring 1, the splicing ring 8 and the abutting sleeve ring 9 obtained by molding in step S1 are placed together in a cleaning machine for surface oil cleaning treatment. After cleaning, they are sent to a drying machine for drying treatment. After drying, a layer of high-temperature-resistant and anti-oxidation coating is applied to the surfaces of the rotating grinding ring 1.

[0038] S3, quenching and tempering heat treatment: the rotating grinding ring 1 in step S2 is sent to a heating furnace, the heating temperature is adjusted to 680-740℃ for preheating and uniform heating, and then it is cooled to room temperature after 1-2h of heat preservation. Continue to heat to 1050-1120℃, and then cool to room temperature after 2-3h of heat preservation, to complete the quenching and tempering heat treatment of the rotating grinding ring 1.

[0039] S4, tempering and dispersion hardening heat treatment: the rotating grinding ring 1, the splicing ring 8 and the abutting sleeve ring 9 subjected to quenching and tempering heat treatment in step S3 are subjected to two times of tempering and dispersion hardening heat treatment, wherein the first tempering temperature is 420-480℃, the heat preservation time is 1-1.5h, and the cooling method is air cooling to room temperature. The second tempering temperature is 510-580℃, the heat preservation time is 1-1.5h, and the cooling method is air cooling to room temperature. The heat treatment of the rotating grinding ring 1, the splicing ring 8 and the abutting sleeve ring 9 is completed.

[0040] Further, it is worth noting that the heat treatment furnace adopts a heat treatment electric furnace with nitrogen protection.

[0041] Further, it is worth noting that the high-temperature-resistant and oxidation-resistant coating is an inorganic heat-resistant and oxidation-resistant glaze ceramic anti-oxidation paint.

[0042] Further, it is worth noting that the outer surface of the butt joint collar 9 is ground, and the rotating grinding ring 1 is rotated for immersion rust-proof treatment.

[0043] The rotating grinding ring 1 is made of high-temperature-resistant alloy steel material and coated with a high-temperature-resistant and oxidation-resistant coating, so as to effectively improve the high-temperature-resistant performance of the rotating grinding ring 1. Further, the rotating grinding ring 1 is subjected to quenching and tempering heat treatment and twice dispersion hardening heat treatment, so as to realize multiple heat treatments of the rotating grinding ring 1, greatly improve the high-temperature-resistant and wear-resistant performance of the rotating grinding ring 1, and prolong the service life of the rotating grinding ring 1.

[0044] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A wear-resistant and high-temperature-resistant grinding ring for a steel ball rounding machine, comprising a rotating grinding ring (1), an outer surface of one end of the rotating grinding ring (1) being provided with a ball rolling groove (2), characterized in that, The inner surface of the rotating grinding ring (1) is provided with a lubricating groove (3), the outer surface of the two ends of the rotating grinding ring (1) is provided with an outwardly extending reinforcing ring (4), the two reinforcing rings (4) are provided with a mounting area (5) therebetween, the inside of the mounting area (5) is provided with an oil injection hole (6) penetrating through the lubricating groove (3), the inner wall of the oil injection hole (6) is threadedly connected with a fastening bolt (7), the inside of the mounting area (5) is provided with two symmetrically distributed splicing rings (8), the two splicing rings (8) are in abutting arrangement with the outer surface of the reinforcing ring (4), and the end surface of the rotating grinding ring (1) away from the rolling ball ring groove (2) is detachably connected with a butt joint sleeve ring (9), and the inner surface of the butt joint sleeve ring (9) is in abutting arrangement with the outer surfaces of the two splicing rings (8).

2. A wear-resistant and high-temperature-resistant grinding ring of a steel ball rounding machine according to claim 1, characterized in that, The inner wall of the butt joint sleeve ring (9) is provided with an inwardly extending convex ring (10), and the outer surface of the end of the rotating grinding ring (1) away from the rolling ball ring groove (2) is provided with an annular embedding groove (11) matched with the convex ring (10).

3. A wear-resistant and high-temperature-resistant grinding ring of a steel ball rounding machine according to claim 2, characterized in that, The outer surfaces of the two splicing rings (8) are provided with a plurality of equiangularly distributed through holes (12), and the outer end of each through hole (12) is provided with a heat dissipation channel (13) formed on the outer surface of the butt joint sleeve ring (9).

4. A wear-resistant and high-temperature-resistant grinding ring of a steel ball rounding machine according to claim 1, characterized in that, The inner surface of the rotating grinding ring (1) is provided with a plurality of oil storage grooves (14) in communication with the lubricating groove (3), and each oil storage groove (14) is in a racetrack shape.

5. A process for heat treatment of the wear resistant high temperature resistant grinding ring of the steel ball rounding machine as claimed in any one of claims 1 to 4, wherein, The method comprises the following steps: S1, forming treatment: selecting high-temperature-resistant alloy steel material, heating and melting, adding pig iron or graphite to increase carbon, mixing and heating to form molten steel, and forming new heat-resistant alloy material, and forming rotating grinding ring (1), splicing ring (8) and butt joint sleeve ring (9) after molding; S2, cleaning, drying and coating treatment: the rotating grinding ring (1), the splicing ring (8) and the butt joint sleeve ring (9) obtained by molding in step S1 are placed in a cleaning machine for surface oil cleaning treatment, and after cleaning, they are sent into a drying machine for drying treatment, and after drying, a layer of high-temperature-resistant and oxidation-resistant coating is coated on each surface of the rotating grinding ring (1); S3, quenching and tempering heat treatment: the rotating grinding ring (1) in step S2 is sent into a heating furnace, the heating temperature is adjusted to 680~740℃ for preheating and uniform heating, and after heat preservation for 1~2h, it is air cooled to room temperature, and then heated to 1050~1120℃, and after heat preservation for 2~3h, it is furnace cooled to room temperature, and the quenching and tempering heat treatment of the rotating grinding ring (1) is completed; S4, tempering and dispersion hardening heat treatment: the rotating grinding ring (1), the splicing ring (8) and the butt joint sleeve ring (9) subjected to quenching and tempering heat treatment in step S3 are subjected to twice tempering and dispersion hardening heat treatment, wherein the first tempering temperature is 420~480℃, the heat preservation time is 1~1.5h, and the air cooling temperature is room temperature, the second tempering temperature is 510~580℃, the heat preservation time is 1~1.5h, and the air cooling temperature is room temperature, and the heat treatment of the rotating grinding ring (1), the splicing ring (8) and the butt joint sleeve ring (9) is completed.

6. The heat treatment process of the wear-resistant and high-temperature-resistant grinding ring of a steel ball rounding machine according to claim 5, characterized in that, The heating furnace is a heat treatment electric furnace with nitrogen protection.

7. The heat treatment process of the wear-resistant and high-temperature-resistant grinding ring of a steel ball rounding machine according to claim 5, characterized in that, The high-temperature-resistant and oxidation-resistant coating is an inorganic heat-resistant and oxidation-resistant poly-glaze ceramic anti-oxidation paint.

8. The heat treatment process of the wear-resistant and high-temperature-resistant grinding ring of a steel ball rounding machine according to claim 5, characterized in that, The outer surface of the butt joint collar (9) is ground, and the rotating grinding ring (1) is subjected to immersion rust-proof treatment.

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