Method for riveting cylindrical roller bearing brass cages

Abstract

The application belongs to the technical field of bearing retainer, and particularly relates to a riveting method for a cylindrical roller bearing copper retainer, which is characterized in that the workpiece is subjected to one-time riveting and two-time riveting through a riveting head, the one-time riveting completes a partial stroke, and the two-time riveting completes a remaining stroke. The riveting method can ensure that the retainer after riveting is not deformed and does not need to be given a high heating voltage, and thus waste products are not caused, because a high heating temperature is not needed, each piece can be guaranteed to be naturally attached and not deformed, and the riveting quality of the retainer is effectively ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bearing retainer, and particularly relates to a riveting method for a cylindrical roller bearing copper retainer. BACKGROUND

[0002] The riveting of the second-type cylindrical ECM series retainer is usually formed by one-time riveting after the equipment height and riveting temperature are adjusted, and the riveting is completed by pressing the switch. The riveting is prone to loosening or deformation. Because the riveting is heated, the riveting shape after the copper rivet is heated is random, and the riveting is prone to waste. The adjustment only has two points, that is, the current is increased or the air pressure is increased. It is difficult to control the natural fit without deformation and the problem of beauty. The riveting is prone to waste, and the riveting quality of the retainer cannot be guaranteed. SUMMARY

[0003] In view of the defects in the prior art, the purpose of the present application is to provide a riveting method for a cylindrical roller bearing copper retainer. The riveting is completed by two-time riveting to ensure that each product is naturally fitted without deformation and the riveting quality is guaranteed.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a riveting method for a cylindrical roller bearing copper retainer, which is riveted by a rivet head once and twice. The first-time riveting completes part of the stroke, and the second-time riveting completes the remaining stroke.

[0005] The downstroke of the rivet head in the first-time riveting is 85%-95% of the total stroke, and the heating temperature is 280-320 DEG C. The rivet head is not heated in the second-time riveting, and the remaining stroke is completed by using the residual heat of copper for secondary pressure.

[0006] Based on the above technical scheme, the rivet head is not heated in the second-time riveting, that is, the temperature is maintained unchanged in the first-time riveting, and only the pressure value is changed. The pressure values of the two-time riveting are adjusted in real time along with the increase of the height of each different type of retainer and the increase of the area of the rivet head.

[0007] Further, the riveting time of the rivet head in the first-time riveting is 2s-3s, and the riveting time of the rivet head in the second-time riveting is 1s-2s.

[0008] Based on the above technical scheme, the riveting time is the sum of the stroke time of the rivet head and the dwell time after the stroke is in place.

[0009] Further, the rivet head is heated and riveted by an electric riveter. The rivet head is driven to complete the downstroke by a hydraulic cylinder and an air cylinder.

[0010] Further, the electric riveter adopts double-cylinder driving. The hydraulic cylinder drives the air cylinder and the rivet head to down in the first-time riveting of the rivet head, and the air cylinder drives the rivet head to down in the second-time riveting of the rivet head.

[0011] Based on the above technical scheme, the second riveting action driven by the air cylinder is to realize pressurization on the basis of the first step pressure value, drive the rivet head to press down, and the rivet head cannot press down without pressurization and cannot realize secondary riveting.

[0012] Further, after the secondary riveting of the rivet head is completed, the rivet head is lifted, the pressurizing rod in the air cylinder is lifted, the hydraulic oil of the hydraulic cylinder is returned, and one riveting action is completed.

[0013] Further, the pressurization and heating are simultaneously performed during the first riveting of the rivet head.

[0014] Further, the rivet head action is controlled by the PLC.

[0015] Further, the rivet head of the retainer copper rivet head with a surface area of 6*5.98mm and a height of 3.75mm is processed, the downstroke of the rivet head during the first riveting is 2.28mm, the heating temperature is 300℃, the pressurization pressure is 7.7kgf, the downstroke is 2.28mm, the riveting time is 2.5 seconds, the heating is stopped during the secondary riveting of the rivet head, the pressurization pressure is 6.2kgf, the downstroke is 0.28mm, and the riveting time is 1.5 seconds.

[0016] The beneficial effects of the present application are that the retainer riveted by the riveting method of the present application is not deformed and does not need to be given a high heating voltage, and waste products are not caused because a high heating temperature is not needed, each piece can be guaranteed to be naturally attached without deformation, and the riveting quality of the retainer is effectively guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure diagram of the electric riveter used in the riveting method of the present application is shown in the figure.

[0018] Figure 2 The side view of the electric riveter used in the riveting method of the present application is shown in the figure. Figure 1

[0019] In the figure: 1, three-color warning light, 2, air-liquid cylinder, 3, machine body, 4, cylinder seat, 5, electrode holding rod, 6, main copper rod, 7, electrode, 8, copper base plate, 9, microcomputer controller, 10, pressure gauge, 11, water filter cup, 12, lubricating oil cup, 13, main transformer, 14, electrode ring, 15, air source valve. DETAILED DESCRIPTION

[0020] In order to make the structure and function of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below by combining the drawings in the embodiments of the present application.

[0021] ​The conventional riveting is carried out by using a single cylinder, and the height of a finished product after riveting is set in advance, for example, the height after riveting is 1.2 mm, and then the distance between the rivet head and the end cover of the retainer is observed, and the distance is adjusted, and then the temperature is heated to about 600 DEG C, and the switch is started once, and after the copper rivet head is contacted, the temperature is instantaneously increased, the pressure stroke is set to walk down for about 1 second, the riveting is completed, and the rivet head is lifted up, and if the height is not enough, the stroke screw needs to be adjusted to continue to walk down. Because the pressure of the single cylinder is based on the pressure value of the air compressor, the pressure is constant, and the force can be increased only by adjusting the stroke, and the force is about 3-4 kg, and if the riveting is not in place, the temperature is generally adjusted. The conventional electric riveting machine adopts pneumatic driving, because the pneumatic driving is more sensitive than hydraulic driving in reaction time, the hydraulic cylinder is slow in reaction due to the oil return gap problem, but the pressure value and the time are controllable. Therefore, in order to realize the riveting method of the present application, a hydraulic cylinder and a pneumatic cylinder are used to realize the double-cylinder structure of the electric riveting machine, and the single-cylinder structure cannot realize the secondary riveting effect of the present application.

[0022] The cylindrical roller bearing copper retainer riveting method of the present application is characterized in that the workpiece is riveted once and twice by the electric riveting machine with a gas-liquid pressure boosting double cylinder, 85%-95% of the stroke is completed by the first riveting, and the remaining stroke is completed by the second riveting; the hydraulic cylinder is used to drive the rivet head to complete the first riveting, the downstroke is 85%-95%, the heating temperature is 280-320 DEG C, the pressure and the heating are simultaneously performed, and the riveting time is 2-3 seconds; the heating is stopped during the second riveting, the remaining stroke is completed by the second pressure boosting using the residual heat of the copper, and the riveting time is 1-2 seconds.

[0023] The hydraulic cylinder is used to drive the rivet head to complete the first riveting, the gas cylinder and the rivet head are driven to complete the second riveting. After the second riveting is completed, the rivet head is lifted up, the pressure boosting rod in the gas cylinder is lifted up, the hydraulic oil in the hydraulic cylinder is returned, and one riveting action is completed. The sum of the stroke time and the dwell time after the stroke is completed is the stroke time. The pressure is adjusted in real time with the increase of the height of each different type of retainer and the increase of the area of the rivet head, and the predetermined stroke can be completed.

[0024] The riveting range of the riveting method of the present application is 5.37-9.84 mm between the sizes of the retainer rivet head.

[0025] Based on the above technical scheme, the second riveting action driven by the air cylinder is to realize pressurization on the basis of the first step pressure value, drive the rivet head to press down, and the rivet head cannot press down without pressurization and cannot realize secondary riveting. The two riveting processes can only adopt the steps of one hydraulic cylinder and two air cylinders, because the first step needs to convert the low pressure of the air into tens of times of oil pressure, which is the air pushing the oil to go down, and the response speed is fast, which is faster than the traditional single hydraulic cylinder transmission. The limit position of the hydraulic cylinder is provided with air pressure, and the pressure value of the hydraulic cylinder is unchanged when the second air cylinder is pressurized, and the inside of the second air cylinder is used to realize secondary pressurization by using the piston rod to push the rivet head rod.

[0026] In order to ensure the riveting quality, the traditional air cylinder of the equipment is redesigned into a gas-liquid cylinder which can be pressurized, and a PLC computer is used to control the air valve to realize secondary riveting. According to the principle of the pressurized cylinder, the first step allows the gas to push the hydraulic oil into the working cylinder body to perform the first heating riveting, the second step uses the PLC to control the second air valve to work to pressurize the main air cylinder, thereby realizing the secondary riveting, the third step uses the PLC to control the main air cylinder to retreat, the fourth step uses the PLC to control the hydraulic oil to retreat, and the riveting work is completed. The cage after riveting is not deformed and does not need to be given a high heating voltage, and waste products will not be caused because a high heating temperature is not needed. Each piece can be guaranteed to be naturally attached without deformation, and the riveting pressure can be converted according to the air pressure value of the air cylinder table by using a formula, that is, 3.15*3.15*3.14*pressure table value, which is equal to the air pressure in kilograms.

[0027] Embodiment 1

[0028] The riveting ECM structure of the copper cage, the rivet head area is 6*5.98mm, the height is 3.75mm (the part exposed from the cage end surface), the conventional riveting temperature is about 600°, and the riveting is easy to appear burst pattern, the cage is deformed, the rivet head is burst, the appearance is rough, the riveting position is ugly and the quality is poor. The method of the present application, in the first step, the rivet head is heated and pressurized at the same time, the temperature is heated to 300℃, the secondary hydraulic cylinder is used to pressurize the pressure of 7.7kgf, the downstroke is about 2.28mm, the time is 2.5s, the second step, the heating temperature stops, the main air cylinder works, the pressure is 6.2kgf, the downstroke is about 0.28mm, the time is 1.5s, the third step, the rivet head is lifted, the fourth step, the hydraulic oil flows back, and the riveting action is completed. The appearance is the same as the imported bearing.

[0029] It should be noted that the part not described in the present application is the prior art.

[0030] The above enumeration is only the best embodiment of the present application. Apparently, the present application is not limited to the above embodiment, and there can be many variations. All the variations directly derived or thought from the disclosure of the present application by those skilled in the art should be considered as the protection scope of the present application.

Claims

1. A method for riveting the copper cage of a cylindrical roller bearing, characterized in that: The workpiece is riveted once and twice using a rivet head. The first riveting completes part of the stroke, and the second riveting completes the remaining stroke. The downward stroke of the rivet head during a single riveting operation is 85%-95% of the total stroke, and the heating temperature is 280-320℃; during a single riveting operation, pressure application and heating are performed simultaneously. Heating is stopped when the rivet head is riveted for the second time, and the residual heat is used to apply pressure again to complete the remaining stroke. The riveting time for the first riveting operation is 2-3 seconds, and the riveting time for the second riveting operation is 1-2 seconds. The riveting head is heated and riveted using an electric riveting machine. The riveting head is driven by a hydraulic cylinder and a pneumatic cylinder to complete the downward stroke. The electric riveting machine adopts a dual-cylinder drive. The first riveting of the riveting head is driven by a hydraulic cylinder, which drives the pneumatic cylinder and the riveting head to press down as a whole. The second riveting of the riveting head is driven by a pneumatic cylinder, which drives the riveting head to press down. After the second riveting is completed, the rivet head is lifted, completing one riveting action.

2. The method for riveting the copper cage of a cylindrical roller bearing according to claim 1, characterized in that: The riveting head action is controlled by a PLC.

3. The riveting method for the copper cage of a cylindrical roller bearing according to claim 1, characterized in that: Machining a cage-type copper rivet head with an upper surface area of ​​6*5.98mm and a height of 3.75mm. The downward stroke of the rivet head during the first riveting is 2.28mm, the heating temperature is 300℃, the pressure is 7.7 kgf, the downward stroke is 2.28mm, and the riveting time is 2.5 seconds. When riveting the head for the second time, heating is stopped, the pressure is 6.2 kgf, the downward stroke is 0.28mm, and the riveting time is 1.5 seconds.

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