CN116099972A - Near-net forming method for main pump shell of wet winding motor - Google Patents

Abstract

The invention discloses a near-net forming method for a main pump shell of a wet winding motor, which comprises the following steps: s1, upsetting and drawing out a pump shell blank for a plurality of times, and then setting the pump shell blank; s2, placing the pump shell blank on a profiling lower die, and stamping the pump shell blank by using a step core rod to realize profiling forming of the shape of a straight pipe mouth of the pump shell, the variable cross-section inner cavity of the pump shell and the inner hole of the straight pipe mouth; s3, carrying out rotary upsetting and peeling on the pump shell blank; and S4, placing the blank of the pump shell on a lower anvil after rotating by an angle to form a single-side nozzle of the pump shell. The invention solves the technical problems of profiling forging of the variable section inner cavity, the straight pipe mouth shape, the straight pipe mouth inner hole and the single side nozzle of the main pump shell of the CAP1400 wet winding motor main pump, realizes the near net forming of the pump shell, improves the utilization rate of products, shortens the processing period of the products, and greatly reduces the production and manufacturing cost of the CAP1400 wet winding motor main pump shell.

Description

Near-net forming method for main pump shell of wet winding motor

Technical Field

The invention relates to the technical field of metal material forming, in particular to a near-net forming method for a main pump shell of a wet winding motor.

Background

The reactor coolant circulating main pump is an important power device of the nuclear power station, is a power source of a coolant circulating system, and has the functions of pushing the coolant to flow in a loop at a high speed and stably so as to cool the reactor core and transfer heat to the two loops, and simultaneously cool the reactor core to prevent the burning of fuel elements; the working environment of the main pump is extremely severe, especially in the pump housing, which is subjected to high temperature, high corrosion and high irradiation for a long period of time, and therefore, the pump housing requires extremely safe and reliable quality. Before, the pump shell of the third-generation nuclear power coolant pump adopts an integral forging scheme, but has the defects of low steel ingot utilization rate and long processing period.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a method for near net shape forming of a main pump casing of a wet winding motor.

A method for forming a wet winding motor main pump shell in a near-net manner comprises the following steps:

s1, upsetting and drawing out a pump shell blank for a plurality of times, and then setting the pump shell blank;

s2, placing the pump shell blank on a profiling lower die, and stamping the pump shell blank by using a step core rod to realize profiling forming of the shape of a straight pipe mouth of the pump shell, the variable cross-section inner cavity of the pump shell and the inner hole of the straight pipe mouth;

s3, carrying out rotary upsetting and peeling on the pump shell blank;

and S4, placing the blank of the pump shell on a lower anvil after rotating by an angle to form a single-side nozzle of the pump shell.

In one embodiment, the step S1 includes:

s11, upsetting the pump shell blank to the height H1, and performing strong press drawing to the length D1 after upsetting;

s12, continuously upsetting the pump shell blank to a height H2, performing strong pressing and drawing to a length D2 after upsetting, and performing gas cutting on a clamp handle and the bottom after drawing, wherein the height H1 is greater than the height H2, and the length D1 is smaller than the length D2;

s13, upsetting the pump shell blank to a set state.

In one embodiment, in the step S2, the profiling lower die includes a lower die body, and a shaped hole is formed at a central position of the lower die body; the step core rod comprises two coaxially connected shaft rods, wherein the diameters of the two shaft rods are different, and a draft angle is arranged between the two shaft rods;

the step core rod can penetrate through the pump shell blank, the bottom of the pump shell blank is extruded into the forming hole for forming, and the size of the inner cavity of the pump shell is the size of the large end of the step core rod.

In one embodiment, the step S3 includes:

s31, fixing an upper die ring on the profiling lower die, wherein the upper die ring is sleeved on the outer side of the pump shell blank;

s32, using a wide anvil and a turntable tool to carry out rotary upsetting and peeling on the punched pump shell blank, so that the pump shell blank is filled with the upper die ring.

In one embodiment, the outer side wall of the upper die ring is flush with the outer side wall of the profiling lower die, and a through hole is formed in the outer side wall of one side of the upper die ring.

In one embodiment, in the step S4, the lower anvil includes an anvil body, an arc-shaped groove is formed in an upper surface of the anvil body, and an outer sidewall of the upper die ring and an outer sidewall of the profiling lower die are matched with the arc-shaped groove.

In one embodiment, the step S4 includes:

s41, integrally rotating a pump shell blank with an upper die ring, a profiling lower die and a step mandrel by 90 degrees, and then placing the pump shell blank in an arc-shaped groove of a lower die anvil;

s42, extruding the upper side wall of the pump shell blank through the punch through the through hole, and forming a single-side nozzle.

In one embodiment, the punch includes an interconnecting head and a ram having an outer diameter that is compatible with an inner diameter of the single-sided nozzle.

The near-net forming method for the main pump shell of the wet winding motor solves the technical problems of profiling forging of the variable cross-section inner cavity, the straight pipe mouth shape, the straight pipe mouth inner hole and the single side nozzle of the main pump shell of the CAP1400 wet winding motor main pump shell, achieves near-net forming of the pump shell, improves the utilization rate of products, shortens the processing period of the products, and greatly reduces the production and manufacturing cost of the main pump shell of the CAP1400 wet winding motor.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of the pump housing of the present invention.

FIG. 2 is a schematic illustration of a pump housing blank of the present invention in a first upset and forced draw condition;

FIG. 3 is a schematic illustration of a second upsetting and forced drawing of a pump casing blank according to the present invention;

fig. 4 is a schematic view showing a state in which a pump housing blank of the present invention is upset to a set state;

FIG. 5 is a schematic diagram showing the state of step S2 of the present invention;

FIG. 6 is a schematic view of the invention after profiling the shape of the straight nozzle, the variable section inner cavity of the pump shell and the inner hole of the straight nozzle;

FIG. 7 is a schematic view of the structure of the stepped mandrel of the present invention;

FIG. 8 is a schematic view of the structure of the profiling lower die of the present invention;

fig. 9 is a schematic diagram of the state before upsetting and peeling at step S3 of the present invention;

fig. 10 is a schematic diagram of the state after upsetting and peeling at step S3 according to the present invention;

FIG. 11 is a schematic diagram of the connection structure of the upper die ring and the profiling lower die of the invention;

FIG. 12 is a schematic view showing a state before forming the single-side nozzle in step S4 of the present invention;

FIG. 13 is a schematic view showing a state of the single-sided nozzle after molding in step S4 of the present invention;

FIG. 14 is a schematic structural view of the punch of the present invention;

fig. 15 is a schematic view of the structure of the lower anvil of the present invention.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1-15, an embodiment of the present invention provides a method for near net shape forming of a main pump casing of a wet winding motor, comprising the steps of:

s1, upsetting and drawing the pump shell blank 1 for a plurality of times and then setting the pump shell blank;

s2, placing the pump shell blank 1 on a profiling lower die 2, and stamping the pump shell blank 1 by using a step mandrel 3 to realize profiling of a straight pipe mouth appearance 11, a pump shell variable section inner cavity 12 and a straight pipe mouth inner hole 13 of a pump shell;

s3, carrying out rotary upsetting stripping on the pump shell blank 1;

s4, placing the pump shell blank 1 on the lower die anvil 4 after rotating by an angle to realize the molding of the single-side nozzle 14 of the pump shell.

The near-net forming method of the main pump shell of the wet winding motor solves the technical problems of profiling forging of the variable cross-section inner cavity 12, the straight nozzle appearance 11, the straight nozzle inner hole 13 and the single-side nozzle 14 of the main pump shell of the CAP1400 wet winding motor, realizes near-net forming of the pump shell, improves the utilization rate of products, shortens the processing period of the products, and greatly reduces the production and manufacturing cost of the main pump shell of the CAP1400 wet winding motor.

In an embodiment of the present invention, the step S1 includes:

s11, upsetting the pump shell blank 1 to a height H1, and performing strong press drawing to a length D1 after upsetting;

s12, continuously upsetting the pump shell blank 1 to a height H2, performing strong pressing and drawing to a length D2 after upsetting, and performing gas cutting on a clamp handle and the bottom after drawing, wherein the height H1 is greater than the height H2, and the length D1 is less than the length D2;

and S13, upsetting the pump shell blank 1 to a set state.

In this embodiment, the pump housing blank 1 is provided with a sufficient forging ratio by two upsets (H1 and H2) plus two strong drawing (D1 and D2) to ensure the overall compaction of the pump housing blank 1. In other embodiments of the invention, upsetting and strong drawing may be performed more than 3 times to further ensure compaction of the pump housing blank 1.

In an embodiment of the present invention, in the step S2, the profiling lower die 2 includes a lower die body 21, and a shaped hole 22 is formed at a center position of the lower die body 21; the step core rod 3 comprises two coaxially connected shaft rods, wherein the diameters of the two shaft rods are different, and a draft angle is formed between the two shaft rods;

the stepped mandrel 3 can penetrate the inside of the pump housing blank 1 and press the bottom of the pump housing blank 1 into the shaped hole 22 for molding.

In this embodiment, the pump shell blank 1 is punched by the step mandrel 3, the step mandrel 3 may penetrate through the inside of the pump shell blank 1 to realize profiling molding of the pump shell variable-section inner cavity 12 and the straight nozzle inner hole 13, and the bottom of the pump shell blank 1 is extruded into the shaped hole 22, so that molding of the straight nozzle outer shape 11 can be directly realized according to the shape of the shaped hole 22, molding is simple and convenient, and all parts of the forging are deformed, thereby ensuring good final performance.

In an embodiment of the present invention, the step S3 includes:

s31, fixing an upper die ring 5 on the profiling lower die 2, wherein the upper die ring 5 is sleeved on the outer side of the pump shell blank 1;

s32, using the wide anvil 6 and the turntable tool to conduct rotary upsetting and peeling on the punched pump shell blank 1, so that the punched pump shell blank is filled with the upper die ring 5. In this way, the gap between the pump shell blank 1 and the upper die ring 5 can be reduced, so that the pump shell blank 1 is basically fixed in a cavity formed by encircling the profiling lower die 2 and the upper die ring 5, and the subsequent molding of the single-side nozzle 14 is facilitated.

In an embodiment of the present invention, the outer side wall of the upper mold ring 5 is flush with the outer side wall of the profiling lower mold 2, and a through hole 51 is formed on the outer side wall of one side of the upper mold ring 5. In this way, the outer side wall surfaces of the upper die ring 5 and the profiling lower die 2 can be kept consistent, and interference with other parts can be avoided.

In an embodiment of the present invention, in the step S4, the lower anvil 4 includes an anvil body 41, an arc-shaped groove 42 is formed on an upper surface of the anvil body 41, and an outer sidewall of the upper die ring 5 and an outer sidewall of the profiling lower die 2 are matched with the arc-shaped groove 42. In this way, the upper die ring 5 and the profiling lower die 2 can be put into the lower die anvil 4 as a whole to increase the contact area with the arc-shaped groove 42 and improve the stability of the single-side nozzle 14 during molding.

In an embodiment of the present invention, the step S4 includes:

s41, integrally rotating the pump shell blank 1 with the upper die ring 5, the profiling lower die 2 and the step mandrel 3 by 90 degrees, and then placing the pump shell blank into the arc-shaped groove 42 of the lower swage block 4;

s42, extruding the upper side wall of the pump housing blank 1 through the through hole 51 by the punch 7, and forming the one-sided nozzle 14.

In this embodiment, the rest of the pump casing blank 1 is fixed on the upper die ring 5, the profiling lower die 2 and the stepped mandrel 3, and when the punch 7 passes through the through hole 51 to extrude the upper side wall of the pump casing blank 1, the corresponding part of the pump casing blank 1 extends along the through hole 51, thereby realizing profiling of the single-side nozzle 14.

In one embodiment of the invention, the punch 7 comprises a head 71 and a punch stem 72 connected to each other, the outer diameter of the punch stem 72 being adapted to the inner diameter of the single-sided nozzle 14. In this way, the inner bore of the single-sided nozzle 14 can be directly punched and formed by the punch 72, reducing the subsequent processing steps.

In summary, the invention solves the technical problems of the variable section inner cavity 12, the straight pipe mouth shape 11, the single side nozzle 14 and the shape profiling forging of the main pump shell of the CAP1400 wet winding motor main pump shell, and realizes the near-net forming of the pump shell. The utilization rate of the product is improved, and the production and manufacturing cost of the main pump shell of the CAP1400 wet winding motor is greatly reduced. The pump shell body is shaped through the inner cavity, the inner hole of the nozzle and the profile, and all parts of the forging piece are deformed, so that the final performance is good. The profiling forming effect of the appearance of the straight pipe mouth, the variable cross-section inner cavity of the pump shell and the inner hole of the straight pipe mouth is realized by using the step core rod 3 for stamping forming. Profiling of the pump housing single-sided nozzle 14 is achieved by punching holes in the outer die ring.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The examples described above represent only a few embodiments of the present invention and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (8)

1. The near-net forming method for the main pump shell of the wet winding motor is characterized by comprising the following steps of:

s1, upsetting and drawing out a pump shell blank for a plurality of times, and then setting the pump shell blank;

s2, placing the pump shell blank on a profiling lower die, and stamping the pump shell blank by using a step core rod to realize profiling forming of the shape of a straight pipe mouth of the pump shell, the variable cross-section inner cavity of the pump shell and the inner hole of the straight pipe mouth;

s3, carrying out rotary upsetting and peeling on the pump shell blank;

and S4, placing the blank of the pump shell on a lower anvil after rotating by an angle to form a single-side nozzle of the pump shell.

2. The method of near net shape forming for the main pump casing of a wet winding motor as set forth in claim 1, wherein said step S1 includes:

s11, upsetting the pump shell blank to the height H1, and performing strong press drawing to the length D1 after upsetting;

s12, continuously upsetting the pump shell blank to a height H2, performing strong pressing and drawing to a length D2 after upsetting, and performing gas cutting on a clamp handle and the bottom after drawing, wherein the height H1 is greater than the height H2, and the length D1 is smaller than the length D2;

s13, upsetting the pump shell blank to a set state.

3. The method for near-net forming of a main pump casing of a wet winding motor according to claim 1 or 2, wherein in the step S2, the profiling lower die comprises a lower die body, and a hole is formed in the center of the lower die body; the step core rod comprises two coaxially connected shaft rods, wherein the diameters of the two shaft rods are different, and a draft angle is arranged between the two shaft rods;

the step core rod can penetrate through the pump shell blank, the bottom of the pump shell blank is extruded into the forming hole for forming, and the size of the inner cavity of the pump shell is the size of the large end of the step core rod.

4. The method of near net shape forming for the main pump casing of a wet winding motor as set forth in claim 3, wherein said step S3 includes:

s31, fixing an upper die ring on the profiling lower die, wherein the upper die ring is sleeved on the outer side of the pump shell blank;

s32, using a wide anvil and a turntable tool to carry out rotary upsetting and peeling on the punched pump shell blank, so that the pump shell blank is filled with the upper die ring.

5. The method of claim 4, wherein the outer side wall of the upper die ring is flush with the outer side wall of the profiling lower die, and a through hole is formed in the outer side wall of one side of the upper die ring.

6. The method of claim 5, wherein in the step S4, the lower anvil includes an anvil body, an arc-shaped groove is formed on an upper surface of the anvil body, and an outer sidewall of the upper die ring and an outer sidewall of the profiling lower die are matched with the arc-shaped groove.

7. The method of near net shape forming a main pump casing of a wet winding motor as set forth in claim 6, wherein said step S4 includes:

s41, integrally rotating a pump shell blank with an upper die ring, a profiling lower die and a step mandrel by 90 degrees, and then placing the pump shell blank in an arc-shaped groove of a lower die anvil;

s42, extruding the upper side wall of the pump shell blank through the punch through the through hole, and forming a single-side nozzle.

8. The wet winding motor main pump casing near net shape forming method of claim 7, wherein said punch comprises a head and a punch stem connected to each other, an outer diameter of said punch stem being adapted to an inner diameter of said single-sided nozzle.

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