A method for processing a steel ball

Abstract

The present application relates to a kind of steel ball processing method, it is applicable to large size, small batch steel ball processing;The method is carried out according to the following each working procedure step: forging, annealing, light ball, quenching, finish turning, flaw detection, grinding, initial grinding, fine grinding, inspection;The grinding process, using grinding equipment first carries out dry grinding on machine tool, then carries out wet grinding;Dry grinding is dry grinding without grinding fluid using abrasive, and wet grinding is abrasive blasting grinding after dry grinding;The steel ball processing method using the present application is: on the basis of finish turning instead of hard grinding, before initial grinding processing, increase a grinding, using special grinding abrasive, ensure production efficiency;Increase the process of grinding, reduce the processing amount of initial grinding, improve production efficiency;After increasing the process of grinding, steel ball is good in single groove plate rotation effect, efficiently improve the roundness of finish turning, improve the quality of product.

Description

TECHNICAL FIELD

[0001] The application relates to a steel ball processing method, which is suitable for processing of large-size and small-batch steel balls. BACKGROUND

[0002] The general processing procedure of the steel ball is forging, annealing, light ball, quenching, hard grinding, flaw detection, primary lapping, fine lapping and inspection. However, the hard grinding of the small-batch and large-size steel ball cannot be performed on the general circulation machine tool, and is replaced by numerical control fine turning. Since the precision of the numerical control fine turning cannot meet the requirement of the hard grinding, only the allowance can be added, and the processing efficiency is low. SUMMARY

[0003] In view of the technical defects of the steel ball processing procedure, the application provides a steel ball processing method, which replaces the hard grinding with fine turning and adds a lapping procedure before the primary lapping processing, so as to leave an allowance of 20um for the primary lapping.

[0004] In order to achieve the above object, the technical scheme adopted by the application is as follows: a steel ball processing method, characterized in that the following procedures are performed: forging, annealing, light ball, quenching, fine turning, flaw detection, lapping, primary lapping, fine lapping and inspection; the lapping procedure is performed by using a lapping device to first perform dry lapping and then wet lapping on the machine tool; the dry lapping is dry lapping without lapping liquid by using abrasive grains, and the wet lapping is lapping by spraying abrasive grains after dry lapping.

[0005] Further, the main component of the abrasive grains is diamond, and the particle size is about 0.01mm.

[0006] Further, the abrasive grains mainly contain aluminum oxide, lubricant and surfactant.

[0007] Further, the lapping device comprises a lapping plate at the bottom and a fixed plate above the lapping plate; the lapping plate is arranged on the lathe, and the upper end of the fixed plate is provided with an oil cylinder for pressurization.

[0008] Further, the lapping plate is a cast iron plate, and the diameter of the lapping plate is 900mm.

[0009] Further, the lapping plate is driven to rotate by a driving motor, and the steel ball is arranged between the lapping plate and the fixed plate to rotate, so as to lapping by a certain pressure and mechanical movement.

[0010] Further, the rotating speed of the lapping plate is set to 37-40r / min, the pressure is 2-2.5MPa, the amount of the abrasive grains is 100-150g, and the concentration of the abrasive grains is 5%-10%.

[0011] Further, in the process of each disc, first, dry grinding without grinding fluid is used to ensure that the abrasive is attached to the grinding plate and the steel ball, and the dry grinding time is 5-10 minutes, and then grinding fluid is sprayed for grinding, and the grinding amount per hour is 20um;

[0012] Further, the grinding time of the grinding fluid spray grinding is determined according to the actual size.

[0013] The large size steel ball of the application refers to the processing of the steel ball with a diameter of 100mm or more.

[0014] Further, the steel ball processing steps of the application are as follows:

[0015] Forging

[0016] The steel ball blank is forged by using forging equipment according to the process requirements.

[0017] Annealing

[0018] The steel ball is heated to 900-920 degrees Celsius, rapidly cooled in water at 100 degrees Celsius, cooled to 350 degrees Celsius, and then naturally cooled at room temperature.

[0019] Light ball

[0020] Remove the surface ring belt and excess amount of the ball blank, and improve the surface roughness of the steel ball.

[0021] Quenching

[0022] The surface of the steel ball is heated to 820-860 degrees Celsius, and cooled in a salt bath at 160 degrees Celsius.

[0023] Finish turning

[0024] The quenched steel ball is processed on a lathe.

[0025] Flaw detection

[0026] The flaw detection device is used to detect the flaw of the finished steel ball, remove the defective products, and ensure the qualified products.

[0027] Grinding

[0028] Dry grinding + wet grinding, 20um for initial grinding.

[0029] Initial grinding

[0030] The steel ball after the above grinding treatment is processed on a grinding machine to achieve the surface quality of the process specified precision.

[0031] Fine grinding

[0032] The steel ball after initial grinding is processed on a grinding machine to further improve the precision and surface quality of the steel ball.

[0033] inspection

[0034] Final inspection is carried out on each batch of steel balls according to the process requirements, such as the roundness, hardness, metallography, stress, etc. of the steel balls.

[0035] The steel ball processing method has the following beneficial effects:

[0036] On the basis of replacing hard grinding with fine turning, a grinding process is added before initial grinding processing, special grinding abrasive is used, the production efficiency is ensured, the grinding process is added, the processing amount of initial grinding is reduced, the production efficiency is improved, after the grinding process is added, the steel ball rotates well in a single groove plate, the out-of-roundness of fine turning is improved efficiently, and the quality of the product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a schematic diagram of the grinding state of the steel ball in the grinding process of the steel ball processing method.

[0038] In the figure, 1 is a grinding plate, 2 is a fixed plate, and 3 is an oil cylinder pressing position. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, therefore the present application is not limited to the specific embodiments disclosed below. EMBODIMENT

[0040] The specific processes of the large-size steel ball processing method with a diameter of 100mm or more are as follows:

[0041] Forging

[0042] The steel ball blank is forged by using a forging press according to the process requirements.

[0043] Annealing

[0044] The steel ball is heated to 900-920℃, rapidly cooled in water at 100℃, cooled to 350℃, and then naturally cooled at room temperature.

[0045] Polishing

[0046] The surface ring belt and excess amount of the ball blank are removed, and the surface roughness of the steel ball is improved.

[0047] Quenching

[0048] The steel ball surface is heated to 820-860 degrees Celsius and cooled in a 160-degree Celsius salt bath.

[0049] Finish turning

[0050] The quenched steel ball is processed on a lathe.

[0051] Inspection

[0052] The finish-turned steel ball is processed by an inspection device to remove defective products and ensure qualified products.

[0053] Grinding

[0054] Dry grinding + wet grinding, leaving 20um for initial grinding.

[0055] Initial grinding

[0056] The steel ball after the above grinding treatment is processed on a grinder to achieve the surface quality specified by the process.

[0057] Finish grinding

[0058] The initial ground steel ball is processed on a grinder to further improve the precision and surface quality of the steel ball.

[0059] Inspection

[0060] Each batch of steel balls is subjected to final inspection according to the requirements of the process, such as roundness, hardness, metallography, stress, etc.

[0061] The grinding process uses a grinding device to first dry grind and then wet grind on a machine tool; the grinding device includes a grinding plate 1 at the bottom and a fixed plate 2 above the grinding plate 1; the grinding plate 1 is set on a lathe, and the upper end of the fixed plate 2 is provided with an oil cylinder 3 for pressing;

[0062] Further, the grinding plate 1 is a cast iron plate, and the diameter of the grinding plate 1 is 900mm;

[0063] Further, the grinding plate 1 is driven to rotate below, and the steel ball is set between the grinding plate 1 and the fixed plate 2 to rotate, and is ground by a certain pressure and mechanical movement;

[0064] Further, the rotation speed of the grinding plate 1 is set to 37-40r / min, the pressure is 2-2.5MPa, the abrasive amount is 100-150 grams, and the concentration of the grinding fluid added is 5%-10%.

[0065] Further, during the processing of each disc, dry grinding without grinding fluid is first used to ensure that the abrasive adheres to the grinding plate and the steel ball, and the dry grinding time is 5-10 minutes, and then grinding fluid is sprayed for grinding, and the grinding amount per hour is 20um.

[0066] The key of the present application is to increase the grinding process, reduce the processing amount of the primary grinding, and improve the production efficiency;

[0067] After increasing the grinding process, the steel ball rotates well in the single groove plate, efficiently improves the unroundness of the finish machining, and improves the quality of the product.

Claims

1. A method for processing steel balls, characterized in that, The following steps are performed: forging, annealing, polishing, quenching, precision turning, flaw detection, grinding, preliminary grinding, fine grinding, and inspection. The grinding process involves dry grinding on a machine tool using grinding equipment, followed by wet grinding. Dry grinding is dry grinding without grinding fluid using abrasive materials, while wet grinding is grinding with grinding fluid sprayed on after dry grinding. The main component of the abrasive is diamond, and the particle size is approximately 0.01 mm. Grinding fluid mainly consists of aluminum oxide, lubricant, and surfactant; The steel ball in question is a large-sized steel ball with a diameter of 100mm or more; The specific steps in steel ball processing are as follows: forging Steel ball blanks are forged using forging equipment according to process requirements; annealing The steel ball is heated to 900 to 920 degrees Celsius and then rapidly cooled in water at 100 degrees Celsius until it reaches a certain temperature. 350 degrees Celsius, then allow to cool naturally at room temperature; Light Sphere Remove the circumferential band and excess material from the surface of the ball blank to improve the surface roughness of the steel ball; Quenching The surface of the steel ball is heated to 820 to 860 degrees Celsius and then cooled in a salt bath at 160 degrees Celsius. precision turning The quenched steel balls are machined on a lathe; flaw detection After precision machining, the steel balls are subjected to flaw detection equipment to remove defective products and ensure qualified products. Grinding Dry grinding + wet grinding resulted in an initial residue of 20µm. preliminary research The steel balls that have undergone the above grinding process are then processed on a grinding machine to achieve the surface quality required by the process specifications. In-depth study The steel balls after initial grinding are processed on a grinding machine to further improve their precision and surface quality; examine Each batch of steel balls undergoes a final inspection according to the process requirements.

2. The steel ball processing method according to claim 1, characterized in that: The grinding equipment includes a grinding plate at the bottom and a fixed plate located above the grinding plate; the grinding plate is mounted on a lathe, and a hydraulic cylinder is installed at the upper end of the fixed plate for pressurization.

3. The steel ball processing method according to claim 2, characterized in that: The grinding plate is made of cast iron and has a diameter of 900 mm.

4. The steel ball processing method according to claim 2, characterized in that: The grinding plate rotation speed is set to 37-40 r / min, the pressure to 2-2.5 MPa, the abrasive amount to 100-150 g, and the grinding fluid concentration to 5%-10%.

5. A method for processing steel balls according to claim 1, characterized in that: The dry grinding time is 5 to 10 minutes, and the grinding fluid spray grinding has a grinding amount of 20 μm per hour.

6. A method for processing steel balls according to claim 5, characterized in that: The grinding time for slurry spray grinding is determined based on the actual dimensions.

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