CN112605616A - Machining process of large-scale shielding motor thrust disc - Google Patents

Machining process of large-scale shielding motor thrust disc Download PDF

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Publication number
CN112605616A
CN112605616A CN202011499369.3A CN202011499369A CN112605616A CN 112605616 A CN112605616 A CN 112605616A CN 202011499369 A CN202011499369 A CN 202011499369A CN 112605616 A CN112605616 A CN 112605616A
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China
Prior art keywords
thrust disc
grinding
working surface
thrust
disc
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Granted
Application number
CN202011499369.3A
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Chinese (zh)
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CN112605616B (en
Inventor
孙学森
黄秀波
张鹏
杨立峰
赖俊良
柴文虎
曲建
赵书田
张英奇
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Harbin Electric Power Equipment Co Ltd
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Harbin Electric Power Equipment Co Ltd
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Priority to CN202011499369.3A priority Critical patent/CN112605616B/en
Publication of CN112605616A publication Critical patent/CN112605616A/en
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Publication of CN112605616B publication Critical patent/CN112605616B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass

Abstract

The invention relates to a processing technology of a large-scale shielding motor thrust disc, which comprises the following steps: a. roughly turning the thrust disc welding piece on a lathe; b. carrying out finish turning on the roughly machined thrust disc; c. clamping the thrust disc on a grinder workbench, and grinding an inner hole of the thrust disc; d. heating and mounting the thrust disc on the tool plug; e. placing a thrust disc provided with a tool plug on a thrust disc grinding tire for grinding; f. checking the working surface and the non-working surface of the thrust disc by using three coordinates; g. and the thrust disc is detached from the tool plug, cleaned and then stored in a warehouse for subsequent use. The invention improves the motor processing and assembling quality, ensures the stability of the thrust disc in the motor running state, simultaneously uses the equal-height support nails which are ground at present to support the thrust disc, can ensure the processing precision of the thrust disc, improves the qualification rate of products, standardizes the inspection method of the thrust disc and improves the operability.

Description

Machining process of large-scale shielding motor thrust disc
The technical field is as follows:
the invention relates to a processing technology of a large-scale shielding motor thrust disc.
Background art:
the shielding motor is only used for small equipment in the past due to the low efficiency, but along with the development of the national vigorous nuclear power project and nuclear power main pump motor, the shielding motor has higher safety and longer service life, large-scale high-power shielding motors are developed and produced in succession, along with the increasing power of the shielding motor, the thrust disc of the shielding motor is also larger and larger, and in order to ensure the stable performance of the motor in operation and prolong the service life of the shielding motor, the processing requirement on the thrust disc is higher and higher.
In the past, the structure size of a thrust disc of a small-sized shield motor is small, and the size requirement of the thrust disc is easily met during processing. However, the thrust disc of the large-sized shield motor also belongs to a thin-wall part due to the structural change, and the thrust disc is easy to deform in the machining process, so that higher requirements are brought to the machining and manufacturing of the thrust disc, and the thrust disc is required to strictly control factors which may influence the deformation of the thrust disc in the machining process, so that the stable running performance of the motor is ensured.
The invention content is as follows:
the invention aims to provide a machining process of a large-scale shielding motor thrust disc, which solves the problem that the large-scale thrust disc is easy to deform in the machining process and when being installed on a motor rotor, improves the quality of the thrust disc after machining and assembling, and ensures the machining precision of the thrust disc by using equal-height support nails to support the thrust disc. And the inspection stage of the thrust disc is standardized, the inspection quality is ensured, and the inspection efficiency and the operability are improved.
The technical scheme of the invention is as follows: a processing technology of a large-scale shielding motor thrust disc comprises the following steps:
a. rough turning of a thrust disc: roughly machining the upper end surface and the lower end surface of a thrust disc welding piece, an inner circle and an outer circle on a lathe;
b. finish turning of a thrust disc: carrying out finish turning on the roughly machined thrust disc (7);
c. grinding an inner hole: clamping the thrust disc (7) on a grinder workbench, and grinding an inner hole of the thrust disc;
d. installing a tool plug: putting the thrust disc (7) into a heating furnace for heating, fixing the tool plug (6) on the lower pressure plate (10) by screwing the screw (4), sleeving the heated thrust disc (7) on the tool plug (6), wherein the interference magnitude of the thrust disc (7) and the tool plug (6) is consistent with the interference magnitude of the thrust disc (7) actually assembled on a motor rotor, installing the upper pressure plate (5) on the upper part of the tool plug (6), and screwing the screw (4) after installation;
e. grinding a thrust disc: clamping a thrust disc grinding tire (2) on a grinding machine, wherein the thrust disc grinding tire (2) is provided with three radial grooves (2.1), then fixing three support nails (1) on the thrust disc grinding tire (2) in a threaded connection manner, grinding the support nails (1) to enable the three support nails to be equal in height, namely, using a dial indicator to meter the three support nails, wherein the difference value is less than 0.005mm, slowly dropping a working surface (7.1) of a thrust disc onto the three support nails (1) of the thrust disc grinding tire (2) downwards, aligning according to the excircle of the thrust disc (7), installing four baffles (9) on the thrust disc grinding tire (2) and closing the baffles through screws (3), then pushing the thrust disc onto the excircle of the thrust disc through four jackscrews (8), clamping and grinding the thrust disc (7), turning over the non-working surface (7.2) of the thrust disc, slowly dropping the non-working surface (7.2) of the thrust disc onto the three support nails (1) of the thrust disc grinding tire (2) downwards, the outer circle of the thrust disc (7) is aligned, the four jackscrews (8) are propped against the outer circle of the thrust disc to clamp and fix the thrust disc (7), the working surface (7.1) of the thrust disc is ground, a diamond grinding wheel is used for high-efficiency grinding when the thrust disc (7) is ground, and then a silicon carbide grinding wheel is used for fine grinding and polishing the thrust disc (7);
f. checking the thrust disc; the flatness and the parallelism of the thrust disc (7) of the tool plug (6) are checked by using three coordinates, the flatness of a working surface (7.1) of the thrust disc and the parallelism of a non-working surface (7.2) of the thrust disc relative to the working surface (7.1) of the thrust disc are checked, when the working surface (7.1) and the non-working surface (7.2) of the thrust disc are subjected to point taking, at least eleven equidistant pitch circles are required to be taken between a radius R1 and a radius R2, at least twelve position directions are uniformly taken on the circumference, and the flatness and the parallelism of the thrust disc (7) are checked and evaluated by using the intersection points of the pitch circles and the position directions of the circumference;
g. disassembling the thrust disc; and heating the thrust disc (7) by using a heating belt, and removing the thrust disc (7) in the heating process until the thrust disc (7) is removed from the tool plug (6).
The invention has the technical effects that:
1. the thrust disc belongs to a thin-wall part, and during machining and manufacturing of the thrust disc, residual stress remained on the surface of the thrust disc can be effectively reduced by rough turning and then finish turning, so that deformation of the thrust disc is reduced; 2. after the thrust disc is heated, the thrust disc is sleeved on the tool plug in a hot mode, and the interference magnitude of the thrust disc and the tool plug is consistent with the interference magnitude of the thrust disc assembled on the motor rotor, so that deformation caused by the interference magnitude of the thrust disc after the thrust disc is assembled on the motor rotor is avoided, and the flatness of the working surface of the thrust disc is influenced; 3. the thrust disc grinding tire is provided with three radial grooves, so that the lifting belt used when the thrust disc is placed on the thrust disc grinding tire can be conveniently dismounted; 4. three support nails are ground to equal height to support the thrust disc, a dial indicator is used for indicating the three support nails, the difference value is less than 0.005mm, the flatness of the working surface of the thrust disc and the parallelism of the non-working surface relative to the working surface can be ensured, and the three support nails are ground to replace the grinding of the upper end surface of a grinding tire of the thrust disc to support the thrust disc, so that the time is short, the support effect is good, and the efficiency and the quality are improved; 5. the surface material hardness of the thrust disc is higher. Firstly, a diamond grinding wheel is used for grinding the thrust disc until the thrust disc is flat, and the silicon carbide grinding wheel is replaced for fine grinding and polishing. Thus, the better surface state of the thrust disc can be ensured, and the grinding efficiency is also improved; 6. the non-working surface of the thrust disc is ground firstly, and then the working surface of the thrust disc is ground, so that the grinding amount of the working surface of the thrust disc can be reduced, and meanwhile, the working surface of the thrust disc can obtain better flatness requirements finally; 7. the thrust disc is inspected on a three-coordinate system, at least eleven equidistant pitch circles are taken by the thrust disc between the radiuses R1 and R2, at least twelve position directions are uniformly taken on the circumference, and the flatness of the thrust disc is inspected and evaluated by the intersection points of the pitch circles and the position directions of the circumference, so that the inspection method of the thrust disc is standardized, data analysis is facilitated, and operability and efficiency are improved.
Drawings
FIG. 1 is a schematic view of a thrust disc setting tool plug
FIG. 2 is a schematic view of a thrust disc with a non-working surface facing up
FIG. 3 is a schematic view of a thrust plate with a tool plug clamped to a thrust plate scrub tire
Detailed Description
a. Rough turning of a thrust disc: roughly machining the upper end face and the lower end face of a thrust disc welding part, an inner circle and an outer circle on a lathe, wherein the finish turning allowance of the upper end face and the lower end face is 0.8-1.2 mm, the finish turning allowance of the inner circle is 0.4-0.6 mm, and the outer circle is machined to the size required by a drawing;
b. finish turning of a thrust disc: carrying out finish turning on the roughly machined thrust disc 7, wherein the grinding allowance of the upper end surface and the lower end surface is 0.3mm-0.4mm, and the grinding allowance of the inner circle and the double side is 0.8mm-0.15 mm;
c. grinding an inner hole: clamping the thrust disc 7 on a grinder workbench, aligning according to the inner hole and the upper end surface of the thrust disc, and grinding the inner hole of the thrust disc to the size required by the drawing;
d. installing a tool plug: putting a thrust disc 7 into a heating furnace for heating, putting a tool plug 6 on a lower pressing plate 10, fixing the tool plug 6 on the lower pressing plate 10 by combining a screw 4, keeping the temperature for a certain time when the thrust disc 7 reaches the temperature set by the heating furnace, hoisting the heated thrust disc 7 on the tool plug 6 in a hot sleeve manner, wherein the interference magnitude of the thrust disc 7 and the tool plug 6 is consistent with the interference magnitude of the thrust disc 7 actually assembled on a motor rotor, installing an upper pressing plate 5 on the upper part of the tool plug 6, and screwing the screw 4 after installation, as shown in figure 1;
e. grinding a thrust disc: clamping a thrust disc grinding tire 2 on a grinding machine, wherein three radial grooves 2.1 are formed in the thrust disc grinding tire 2, fixing three support nails 1 on the thrust disc grinding tire 2 in a threaded connection mode, and grinding the support nails 1 to enable the three support nails to be equal in height, namely, a dial gauge is used for gauging the three support nails, and the gauging difference is required to be smaller than 0.005 mm. The method comprises the steps of hoisting by using three hoisting belts, slowly dropping a working surface 7.1 of a thrust disc downwards onto three support nails 1 of a grinding tire 2 of the thrust disc, ensuring that the hoisting belts can be detached from the three radial grooves 2.1 on the grinding tire 2 of the thrust disc, aligning according to the excircle of the thrust disc 7, mounting four baffle plates 9 on the grinding tire 2 of the thrust disc and closing the baffle plates through screws 3, then propping the excircle of the thrust disc by using four jackscrews 8, clamping and fixing the thrust disc 7, grinding the non-working surface 7.2 of the thrust disc by using a diamond grinding wheel at high efficiency, grinding the non-working surface 7.2 of the thrust disc until the non-working surface 7.2 is flat as shown in figure 2, and then finely grinding and polishing the non-working surface 7.2 of the thrust disc by using a silicon carbide grinding wheel until a dial indicator is used on a grinding machine to check that the end runout and radial runout of the non-working surface 7.2 of the thrust disc are both smaller than 0.01 mm. The thrust disc 7 is turned over, the non-working surface 7.2 of the thrust disc is slowly dropped onto the three support nails 1 of the grinding tire 2 of the thrust disc downwards, the alignment is carried out according to the excircle of the thrust disc 7, and the thrust disc 7 is clamped and fixed by pushing the four jackscrews 8 against the excircle of the thrust disc, as shown in fig. 3. Grinding a working face 7.1 of the thrust disc, wherein a diamond grinding wheel is used for high-efficiency grinding when the working face 7.1 of the thrust disc is ground, and then a silicon carbide grinding wheel is used for performing fine grinding and polishing on the working face 7.1 of the thrust disc until a dial indicator is used for performing dial checking on a grinding machine until end runout and radial runout of the working face 7.1 of the thrust disc are both smaller than 0.01 mm;
f. checking the thrust disc; when the working surface 7.1 and the non-working surface 7.2 of the thrust disc are checked to take points, the three coordinates are required to take at least eleven equidistant pitch circles between the radius R1 and the radius R2 of 200mm and 450mm, uniformly take at least twelve position directions on the circumference, and check and evaluate the planeness of the working surface 7.1 of the thrust disc and the parallelism of the non-working surface 7.2 of the thrust disc relative to the working surface 7.1 of the thrust disc by the intersection point of the pitch circles and the circumferential position direction;
g. disassembling the thrust disc; the thrust disc 7 is heated using a heating tape and the thrust disc 7 is removed during the heating process until the thrust disc 7 is removed from the tool plug 6.
The invention not only effectively controls the deformation of the thrust disc caused by cutting stress and clamping force in the machining process, but also considers and reduces the deformation caused by assembly interference when the thrust disc is assembled on the motor rotor, improves the machining and assembling quality of the motor, ensures the stability of the thrust disc in the motor running state, simultaneously can ensure the machining precision of the thrust disc by using the ground equal-height support nails to support the thrust disc, improves the qualification rate of products, standardizes the inspection method of the thrust disc and improves the operability.

Claims (1)

1. A processing technology of a large-scale shielding motor thrust disc comprises the following steps:
a. rough turning of a thrust disc: roughly machining the upper end surface and the lower end surface of a thrust disc welding piece, an inner circle and an outer circle on a lathe;
b. finish turning of a thrust disc: carrying out finish turning on the roughly machined thrust disc (7);
c. grinding an inner hole: clamping the thrust disc (7) on a grinder workbench, and grinding an inner hole of the thrust disc;
d. installing a tool plug: putting the thrust disc (7) into a heating furnace for heating, fixing the tool plug (6) on the lower pressure plate (10) by screwing the screw (4), sleeving the heated thrust disc (7) on the tool plug (6), wherein the interference magnitude of the thrust disc (7) and the tool plug (6) is consistent with the interference magnitude of the thrust disc (7) actually assembled on a motor rotor, installing the upper pressure plate (5) on the upper part of the tool plug (6), and screwing the screw (4) after installation;
e. grinding a thrust disc: clamping a thrust disc grinding tire (2) on a grinding machine, wherein the thrust disc grinding tire (2) is provided with three radial grooves (2.1), the three support nails (1) are fixed on the thrust disc grinding tire (2) in a threaded connection mode, the three support nails are equal in height by grinding the support nails (1), namely, a dial indicator is used for marking the three support nails, the difference value is smaller than 0.005mm, the working surface (7.1) of the thrust disc is downwards and slowly dropped on the three support nails (1) of the thrust disc grinding tire (2), alignment is carried out according to the excircle of the thrust disc (7), four baffles (9) are arranged on the thrust disc grinding tire (2) and are closed through screws (3), then four jackscrews (8) are jacked on the excircle of the thrust disc, the thrust disc (7) is clamped and fixed, the non-working surface (7.2) of the thrust disc is overturned, and the non-working surface (7.2) of the thrust disc is slowly dropped on the three support nails (1) of the thrust disc grinding tire (2), the outer circle of the thrust disc (7) is aligned, the four jackscrews (8) are propped against the outer circle of the thrust disc to clamp and fix the thrust disc (7), the working surface (7.1) of the thrust disc is ground, a diamond grinding wheel is used for high-efficiency grinding when the thrust disc (7) is ground, and then a silicon carbide grinding wheel is used for fine grinding and polishing the thrust disc (7);
f. checking the thrust disc; the flatness and the parallelism of the thrust disc (7) of the tool plug (6) are checked by using three coordinates, the flatness of a working surface (7.1) of the thrust disc and the parallelism of a non-working surface (7.2) of the thrust disc relative to the working surface (7.1) of the thrust disc are checked, when the working surface (7.1) and the non-working surface (7.2) of the thrust disc are subjected to point taking, at least eleven equidistant pitch circles are required to be taken between a radius R1 and a radius R2, at least twelve position directions are uniformly taken on the circumference, and the flatness and the parallelism of the thrust disc (7) are checked and evaluated by using the intersection points of the pitch circles and the position directions of the circumference;
g. disassembling the thrust disc; and heating the thrust disc (7) by using a heating belt, and removing the thrust disc (7) in the heating process until the thrust disc (7) is removed from the tool plug (6).
CN202011499369.3A 2020-12-18 2020-12-18 Machining process of large-scale shielding motor thrust disc Active CN112605616B (en)

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