CN114433680B - Nondestructive forming process for stainless steel elbow pipe fitting - Google Patents

Abstract

The invention discloses a nondestructive forming process of a stainless steel elbow pipe fitting, which belongs to the field of elbow pipe forming, and is characterized in that one side with a small bending range of a pipe blank can be heated before the pipe blank is extruded and molded through a distributed scattered point rod, so that the pipe blank is heated and slightly melted near the small bending position, damage-resistant particles are controlled to fall down and fall at the slightly melted position of the pipe blank, and the damage-resistant particles can be condensed to form a damage-resistant reinforcing layer.

Description

Nondestructive forming process for stainless steel elbow pipe fitting

Technical Field

The invention relates to the field of elbow forming, in particular to a nondestructive forming process for a stainless steel elbow pipe fitting.

Background

The stainless steel elbow is different from a carbon steel elbow mainly in material, and chemical components contained in the stainless steel elbow can keep the surface of the elbow from rusting for a long time and cannot be corroded.

In a piping system, a bend is a pipe that changes the direction of a pipe. The angle is divided into 45 degrees and 90 degrees and 180 degrees, which are the most commonly used, and other abnormal angle elbows of 60 degrees and the like are also included according to engineering requirements.

The elbow is made of cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, nonferrous metal and plastics. The connection with the pipe is as follows: direct welding (the most common way) flange connections, hot melt connections, electrofusion connections, screw connections, socket connections, etc. The production process comprises the following steps: welding elbows, stamping elbows, hot-pressing elbows, pushing elbows, casting elbows, forging elbows, clamping elbows and the like. Other names: 90-degree elbows, quarter bends, love bends, white steel elbows, and the like.

When the stainless steel elbow is extruded and molded through the cold pressing die, the bending part is usually extruded and molded through pure mechanical force, so that the deformation stress of the part is large, certain damage, cracks and the like easily exist in the bending part, the strength of the bending part of the elbow is low, the service life is influenced, particularly, the extrusion degree of the bent pipe on one side of the small bending range is large, wrinkles at the part are not smooth, and the part is extremely easy to damage under the action of external force.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to provide a nondestructive forming process for a stainless steel elbow pipe fitting, which can heat one side with a small bending range of a pipe blank before extruding and shaping the pipe blank through the arrangement of distributed scatter-point rods, so that the part, close to the small bending part, of the pipe blank is heated and slightly melted, damage-resistant particles are controlled to fall down and fall on the micro-melting part of the pipe blank, and the damage-resistant particles can be condensed to form a damage-resistant reinforcing layer.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A nondestructive molding process for stainless steel elbow pipe fittings comprises the following steps:

s1, placing an inner mold core on a lower mold by adopting a special elbow forming machine;

s2, controlling the upper die and the lower die to be closed, and aligning the pipe blank to a gap between the upper die and the lower die and a die core;

s3, heating the bent part of the upper die through the distributed scatter bar (1);

s4, extrusion molding, namely moving the pipe blank along a reserved gap between an upper die and a lower die and a die core under the action of an upper push rod of an elbow forming machine, heating and slightly melting the pipe blank close to a small bending part, and controlling the upper die to slightly vibrate through a vibration sensor to enable damage-resistant particles (4) to fall from the small bending part and fall at the micro-melting part of the pipe blank so as to form a damage-stopping reinforcing layer;

and S5, after shaping, pushing the tool to withdraw the formed stainless steel bent pipe from a gap between the mold core and the mold, so as to obtain a finished stainless steel bent pipe with low damage rate.

Through the setting of distributing type scatter some stick, before extruding moulding to the pipe billet, can heat the little one side of pipe billet bending range, thereby make the pipe billet be close to the little kink and be heated little melting, control damage-resistant granule whereabouts this moment, and fall in pipe little melting department, thereby can condense damage-resistant granule and form the loss-stopping strengthening layer, can effectively improve the intensity of stainless steel pipe spare kink department on the one hand, increase of service life, effectively compensate its influence to this department intensity when buckling, on the other hand, when using, when kink atress perhaps receives the friction, loss-stopping strengthening layer can have certain wearing and tearing, near this moment's interior liquid hole makes the metal agent spill over because of wearing and tearing, and then effectively restrain the continuation increase of the wearing and tearing condition, and then show the life who prolongs this stainless steel elbow.

Furthermore, the final temperature after heating in S3 is not lower than 800 ℃, so that the surface of the tube blank can be effectively ensured to be in a certain micro-melting state and can not be completely melted, and therefore, damage-resistant particles can be conveniently adhered to the surface of the tube blank, and a damage-stopping reinforcing layer can be conveniently formed.

Further, distributed scatter and click stick inlays in the little one side of the scope of buckling of last die cavity, it has the storage silo to go up the inside excavation of mould, the loss-resistant granule is filled in the loss-resistant granule, the inner wall that the scope of buckling of die cavity is little is fixed to be inlayed and has penetrating baffle of buckling, distributed scatter and click stick wherein one end with penetrating baffle fixed connection of buckling and inlay in penetrating baffle of buckling.

Further, penetrating baffle of buckling is made for porous material, and penetrating baffle hole internal diameter of buckling is greater than the anti particle diameter of losing for under the effect of shock sensor, the anti particle of losing can be followed penetrating baffle of buckling and fall, makes it in time adhere to on the pipe, thereby makes the department of buckling intensity of pipe higher, effectively reduces simultaneously to buckle and is in when moulding because of the atress extrudeing too big emergence folding condition that leads to the damage takes place.

Further, distributed scattering rod includes the main heating stick, main heating stick one end runs through the mould and extends to the mould outside, the main heating stick other end extends to the inside radial heat conduction pole of fixedly connected with of storage silo, radial heat conduction pole and penetrating buckle a plurality of evenly distributed's scattering heat conduction pole between the baffle, the tip fixedly connected with heat conduction point that radial heat conduction pole was kept away from to scattering heat conduction pole, in the penetrating baffle of buckling of heat conduction point embedding, before moulding to the elbow pipe fitting, heat through the main heating stick, the heat is transmitted to radial heat conduction pole, scattering heat conduction pole and heat conduction point department in proper order from the main heating stick for the heat can be transmitted to the pipe through a plurality of heat conduction points on, thereby make the position of pipe and its contact can in time be heated slightly melt, thereby can condense the loss-resistant granule, make the loss-resistant granule better at the adhesive force on pipe surface, and then make the finished quality of the stainless steel elbow that obtains better.

Furthermore, it is hemispherical to lead the hot spot, and leads the plane end of hot spot and the penetrating one end parallel and level each other that the baffle is buckled and is close to the die cavity for when pipe surface and the contact of die cavity inner wall, just contact with the heat conduction point simultaneously, and then effectively guarantee that the pipe surface can in time take place to slightly melt.

Further, main heating rod, radial heat conduction pole and the outer surface of the heat conduction pole of scattered point all wrap up there is outer isolation layer, outer isolation layer is made for thermal insulation material, and the heat that outer isolation layer can effectively completely cut off the three outwards gives off, effectively protects effectively on the one hand that the anti-damage granule is difficult for taking place the phenomenon of caking because of high temperature, and on the other hand can effectively gather the heat-collecting capacity, effectively avoids thermal scattering and disappearing, effectively accelerates the micro-melting speed of pipe, and then accelerates the shaping efficiency of stainless steel elbow.

Furthermore, the damage-resistant particles comprise ceramic powder particles, a plurality of inner liquid holes are formed in the ceramic powder particles, a metal repairing agent is filled in the inner liquid holes, on one hand, the damage-resistant particles are attached to the surface of the stainless steel bent pipe, the formed damage-stopping reinforcing layer can effectively improve the strength of the bent part of the stainless steel pipe, the service life is prolonged, the influence of the bent part on the strength is effectively compensated, on the other hand, when the stainless steel pipe is used, when the bent part is stressed or is rubbed, certain abrasion can exist in the damage-stopping reinforcing layer, the inner liquid holes nearby at the moment overflow due to abrasion, further the continuous increase of the abrasion condition is effectively inhibited, and the service life of the stainless steel pipe is obviously prolonged.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) This scheme is through the setting of distributing type scatter some stick, before extrudeing moulding to the base, can heat the little one side of base scope of buckling, thereby make the base be close to the little kink of department and be heated the microfusion, control damage-resistant granule whereabouts this moment, and fall in the pipe microfusion department, thereby can condense damage-resistant granule and form the loss-stopping reinforcing layer, on the one hand, can effectively improve the intensity of stainless steel pipe spare department of buckling, and the service life is prolonged, effectively compensate its influence to this department intensity when buckling, on the other hand, when using, when the department atress of buckling perhaps receives the friction, loss-stopping reinforcing layer can have certain wearing and tearing, near this moment's interior liquid hole makes the metalling spill over because of wearing and tearing, and then effectively restrain the continuation increase of the repairing wearing and tearing condition, and then show the life who prolongs this stainless steel elbow.

(2) And the final temperature after heating in the step S3 is not lower than 800 ℃, so that the surface of the tube blank can be effectively ensured to be in a certain micro-melting state and not to be completely melted, and therefore, the anti-damage particles can be conveniently adhered to the surface of the tube blank, and the formation of the damage-stopping reinforcing layer is facilitated.

(3) Distributed scatter some stick is inlayed in the one side that the scope of buckling of last mould die cavity is little, goes up the inside storage silo that cuts of mould, and the loss-resistant granule is filled in the loss-resistant granule, and the inner wall that the scope of buckling of die cavity is little is fixed to be inlayed and is had penetrating baffle of buckling, and distributed scatter some stick wherein one end with penetrating baffle fixed connection of buckling and inlay in penetrating baffle of buckling.

(4) Penetrating baffle of buckling is made for porous material, and penetrating baffle hole internal diameter of buckling is greater than the loss-resistant granule particle diameter for under the shock transducer effect, the loss-resistant granule can be followed penetrating baffle of buckling and fall, makes it can in time adhere to on the pipe, thereby makes the intensity of the department of buckling of pipe higher, effectively reduces to buckle simultaneously and is in when moulding because of the atress extrusion too big emergence folding condition that leads to the damage takes place.

(5) Distributed scattered some stick includes the main heating stick, main heating stick one end runs through the mould and extends to the mould outside, the main heating stick other end extends to the inside and the radial heat conduction pole of fixedly connected with of storage silo, radial heat conduction pole and penetrating buckle between the baffle a plurality of evenly distributed's the scattered some heat conduction pole of fixedly connected with, the tip fixedly connected with heat conduction point that radial heat conduction pole was kept away from to scattered some heat conduction pole, heat conduction point embedding is in penetrating buckle in the baffle, before moulding to the elbow pipe fitting, heat is heated through the main heating stick, the heat transmits to radial heat conduction pole from the main heating stick in proper order, scattered some heat conduction pole and heat conduction point department, make the heat can transmit to the pipe through a plurality of conductions on, thereby make the position of pipe contact with it can in time be heated slightly melt, thereby can condense the loss-resistant granule, make the adhesion force of loss-resistant granule on the pipe surface better, and then make the off-the-shelf quality of stainless steel elbow that obtains better.

(6) The heat conduction point is hemispherical, and the plane end of the heat conduction point is parallel and level with one end of the penetrating bent partition plate close to the die cavity, so that when the outer surface of the tube blank is in contact with the inner wall of the die cavity, the heat conduction point is just contacted with the heat conduction point, and the surface of the tube blank can be timely slightly melted.

(7) The outer isolation layer is wrapped up to main heating rod, radial heat conduction pole and scattered point heat conduction pole surface, and outer isolation layer is made for thermal insulation material, and the heat that outer isolation layer can effectively completely cut off the three outwards gives off, effectively protects effectively on the one hand the phenomenon that the anti-damage granule is difficult for taking place the caking because of high temperature, and on the other hand can effectively gather the heat, effectively avoids thermal scattering and disappearing, effectively accelerates the micro-melting speed of pipe, and then accelerates the shaping efficiency of stainless steel elbow.

(8) The anti-damage particle comprises a ceramic powder particle, a plurality of inner liquid holes are formed in the ceramic powder particle, a metal repairing agent is filled in the inner liquid holes, on one hand, a plurality of anti-damage particles are attached to the surface of the stainless steel bent pipe, a formed anti-damage reinforcing layer can effectively improve the strength of the bent part of the stainless steel pipe, the service life is prolonged, the influence of the bending part on the strength is effectively compensated, on the other hand, when the anti-damage particle is used, when the bent part is stressed or is rubbed, certain abrasion can exist in the anti-damage reinforcing layer, the inner liquid holes nearby at the moment overflow due to abrasion, further, the abrasion condition is effectively inhibited from being continuously increased, and the service life of the anti-damage particle is remarkably prolonged.

Drawings

FIG. 1 is a principal flow diagram of the present invention;

FIG. 2 is a schematic structural diagram of a finished stainless steel elbow of the present invention;

FIG. 3 is a schematic structural view of an upper die of the present invention;

FIG. 4 is a schematic view of the structure at A in FIG. 3;

FIG. 5 is a schematic diagram of a distributed scatter bar portion of the present invention;

fig. 6 is a schematic view of the structure of the damage-resistant particle of the present invention.

The reference numbers in the figures illustrate:

1 distributed type scattering bar, 11 main heating bars, 12 radial heat conducting rods, 13 scattering heat conducting rods, 14 heat conducting points, 2 transparent bent partition plates, 3 storage bins, 4 damage-resistant particles, 41 ceramic powder particles, 42 inner liquid holes and 5 outer isolation layers.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person of ordinary skill in the art without making any creative effort; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

Example 1:

referring to fig. 1, a nondestructive forming process for stainless steel elbow pipe fittings includes the following steps:

s1, placing an inner mold core on a lower mold by adopting a special elbow forming machine;

s2, controlling the upper die and the lower die to be closed, and aligning the pipe blank to a gap between the upper die and the lower die and a die core;

s3, heating the bent part of the upper die through the distributed scatter bar 1;

s4, extrusion molding, namely moving the pipe blank along a reserved gap between an upper die and a lower die and a die core under the action of an upper push rod of an elbow forming machine, heating and slightly melting the pipe blank close to a small bending part, and controlling the upper die to slightly vibrate through a vibration sensor to enable the small bending part to fall anti-damage particles 4 and fall at the micro-melting part of the pipe blank so as to form a loss stopping reinforcing layer;

and S5, after shaping, pushing the tool to withdraw the formed stainless steel bent pipe from a gap between the mold core and the mold, referring to fig. 2, wherein b represents a finished stainless steel bent pipe product, and c represents a damage-stopping reinforcing layer, which represents that a finished stainless steel bent pipe product with low damage rate is obtained.

And the final temperature after heating in the step S3 is not lower than 800 ℃, so that the surface of the tube blank can be effectively ensured to be in a certain micro-melting state and not to be completely melted, and therefore, the damage-resistant particles 4 can be conveniently adhered to the surface of the tube blank, and the formation of a damage-stopping reinforcing layer is facilitated.

Referring to fig. 3, a in the figure shows an upper die, a distributed scattering rod 1 is embedded at one side of a die cavity of the upper die, the upper die is provided with a storage bin 3, damage-resistant particles 4 are filled in the damage-resistant particles 4, a transparent bending partition plate 2 is fixedly embedded at the inner wall of the die cavity with the small bending range, and one end of the distributed scattering rod 1 is fixedly connected with the transparent bending partition plate 2 and embedded in the transparent bending partition plate 2.

Referring to fig. 4, the transparent bending partition plate 2 is made of a porous material, and the inner diameter of the pores of the transparent bending partition plate 2 is larger than the particle size of the damage-resistant particles 4, so that the damage-resistant particles 4 can fall from the transparent bending partition plate 2 under the action of the vibration sensor, and can be attached to the tube blank in time, thereby improving the strength of the bending part of the tube blank, and effectively reducing the occurrence of damage caused by folding due to too large stress and extrusion when the bending part is molded.

Referring to fig. 4-5, the distributed type scattering rod 1 includes a main heating rod 11, one end of the main heating rod 11 penetrates through the upper mold and extends to the outer side of the upper mold, the other end of the main heating rod 11 extends into the storage bin 3 and is fixedly connected with a radial heat conducting rod 12, a plurality of scattering heat conducting rods 13 which are uniformly distributed are fixedly connected between the radial heat conducting rod 12 and the transparent bending partition plate 2, the end part of the scattering heat conducting rod 13 far away from the radial heat conducting rod 12 is fixedly connected with a heat conducting point 14, the heat conducting point 14 is hemispherical, and the plane end of the heat conducting point 14 is flush with the end of the transparent bending partition plate 2 close to the mold cavity, so that when the outer surface of the pipe blank contacts with the inner wall of the mold cavity, the pipe blank just contacts with the heat conducting point 14, thereby effectively ensuring that the surface of the pipe blank can be slightly melted in time, the heat conducting point 14 is embedded into the transparent bending partition plate 2, before the elbow pipe fitting is shaped, the main heating rod 11 is used for heating, the heat is transmitted to the radial heat conducting rod 12, the radiating heat conducting rod 13 and the heat conducting points 14 from the main heating rod 11 in sequence, so that the heat can be transmitted to the tube blank through the plurality of heat conducting points 14, the contact part of the tube blank with the tube blank can be heated and slightly melted in time, the damage-resistant particles 4 can be condensed, the adhesive force of the damage-resistant particles 4 on the surface of the tube blank is better, the quality of the obtained stainless steel elbow finished product is better, the outer surfaces of the main heating rod 11, the radial heat conducting rod 12 and the radiating heat conducting rods 13 are all wrapped with the outer isolating layer 5, the outer isolating layer 5 is made of heat insulating materials, the outer isolating layer 5 can effectively isolate the heat of the three from being radiated outwards, on one hand, the damage-resistant particles 4 are effectively protected from being agglomerated due to high temperature, on the other hand, the heat can be effectively collected, the heat dissipation is effectively avoided, and the micro-melting speed of the tube blank is effectively accelerated, thereby accelerating the forming efficiency of the stainless steel elbow.

Referring to fig. 6, the damage-resistant particles 4 include ceramic particles 41, a plurality of inner liquid holes 42 are drilled in the ceramic particles 41, and a metal repairing agent is filled in the inner liquid holes 42, so that on one hand, the plurality of damage-resistant particles 4 are attached to the surface of the stainless steel bent pipe to form a damage-stopping reinforcing layer, which can effectively improve the strength of the bent portion of the stainless steel pipe, prolong the service life, and effectively compensate the influence of the bent portion on the strength, on the other hand, when the bent portion is stressed or rubbed, the damage-stopping reinforcing layer can be abraded to a certain extent, and the inner liquid holes 42 nearby at this time overflow due to abrasion, thereby effectively inhibiting the continuous increase of the abrasion condition, and further significantly prolonging the service life.

Through the setting of distributing type scatter some stick 1, before extruding moulding to the base pipe, can heat the little one side of base pipe scope of buckling, thereby make the base pipe be close to the little kink and be heated the micro-melting, control damage-resistant granule 4 whereabouts this moment, and fall in the pipe micro-melting department, thereby can condense damage-resistant granule 4 and form the loss-stopping strengthening layer, can effectively improve the intensity of stainless steel pipe spare kink department on the one hand, increase of service life, effectively compensate its influence to this department intensity when buckling, on the other hand, when using, when kink atress perhaps receives the friction, certain wearing and tearing can exist in the loss-stopping strengthening layer, near this moment's interior liquid hole 42 makes the metal repairing agent spill over because of wearing and tearing, and then effectively restrain the continuation increase of the wearing and tearing condition, and then show the life of prolonging this stainless steel elbow.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims (5)

1. A nondestructive forming process for stainless steel elbow pipe fittings is characterized by comprising the following steps: the method comprises the following steps:

s1, placing an inner mold core on a lower mold by adopting an elbow forming machine;

s2, controlling the upper die and the lower die to be closed, and aligning the pipe blank to a gap between the upper die and the lower die and a die core;

s3, heating the bent part of the upper die through the distributed scatter bar (1);

s4, extrusion molding, namely moving the pipe blank along a reserved gap between an upper die and a lower die and a die core under the action of an upper push rod of an elbow forming machine, heating and slightly melting the pipe blank close to a small bending part, and simultaneously controlling the upper die to slightly vibrate through a vibration sensor so that damage-resistant particles (4) fall from the small bending part and fall at the micro-melting part of the pipe blank to form a damage-stopping reinforcing layer;

s5, after shaping, pushing the tool to withdraw the formed stainless steel bent pipe from a gap between the mold core and the mold to obtain a finished stainless steel bent pipe with low damage rate;

distributed scatter some stick (1) inlays the one side that the scope of buckling is little at last die cavity, go up the inside excavation of mould and have storage silo (3), anti-damage granule (4) are filled in storage silo (3), the inner wall that the scope of buckling is little is fixed to be inlayed and is had penetrating baffle (2) of buckling, penetrating baffle (2) of buckling is made for porous material, and penetrating baffle (2) hole internal diameter of buckling is greater than anti-damage granule (4) particle diameter, distributed scatter some stick (1) wherein one end and penetrating baffle (2) fixed connection of buckling and inlay in penetrating baffle (2), distributed scatter some stick (1) including main heating stick (11), main heating stick (11) one end runs through the mould and extends to the mould outside, main heating stick (11) other end extends to inside and fixedly connected with radial heat conduction pole (12) of hot spot storehouse (3), radial heat conduction pole (12) and the radial heat conduction pole (14) of buckling of fixedly connected with a plurality of evenly distributed scatter between baffle (2) lead heat conduction pole (12), the embedding of penetrating heat conduction pole (14) lead in the baffle (2).

2. The nondestructive molding process of the stainless steel elbow pipe fitting according to claim 1, characterized in that: and the final temperature after heating in the step S3 is not lower than 800 ℃.

3. The nondestructive molding process of the stainless steel elbow pipe fitting as claimed in claim 1, wherein: the heat conducting points (14) are hemispherical, and the plane ends of the heat conducting points (14) are flush with one end, close to the die cavity, of the through bent partition plate (2).

4. The nondestructive molding process of the stainless steel elbow pipe fitting according to claim 1, characterized in that: the outer surfaces of the main heating rod (11), the radial heat conducting rod (12) and the scattered heat conducting rod (13) are wrapped with outer isolation layers (5), and the outer isolation layers (5) are made of heat insulating materials.

5. The nondestructive molding process of the stainless steel elbow pipe fitting according to claim 1, characterized in that: the damage-resistant particles (4) comprise ceramic powder particles (41), a plurality of inner liquid holes (42) are formed in the ceramic powder particles (41), and a metal repairing agent is filled in the inner liquid holes (42).

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