CN115415408B - Pipe connecting cover plate pressing die, production method thereof and liner pipe cover plate forming method - Google Patents
Pipe connecting cover plate pressing die, production method thereof and liner pipe cover plate forming method Download PDFInfo
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- CN115415408B CN115415408B CN202211078635.4A CN202211078635A CN115415408B CN 115415408 B CN115415408 B CN 115415408B CN 202211078635 A CN202211078635 A CN 202211078635A CN 115415408 B CN115415408 B CN 115415408B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
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Abstract
The invention discloses a liner tube cover plate pressing die and a production method thereof, and a liner tube cover plate forming method. The stamping head, the upper die part and the lower die part in the pressing die have the effect of automatically adjusting concentricity, so that the risks of eccentric pressing and excessive pressing scratches of the connecting pipe cover plate caused by misoperation of adjusting the concentricity by a worker depending on operation experience are avoided.
Description
Technical Field
The invention relates to a liner tube cover plate pressing die, a production method thereof and a liner tube cover plate forming method.
Background
Along with the rapid development of economy in China, the application of titanium materials in the fields of chemical industry, environmental protection, hazardous waste treatment and the like is gradually increased, wherein the pressure vessel manufactured by the titanium-steel composite plate has the characteristics of better corrosion resistance, high use reliability and long service life compared with stainless steel, aluminum, copper and other materials in the corrosion environments of seawater, wet chlorine, acetic acid, nitric acid and the like under the working conditions of high and low temperature, and has the advantage of relatively lower cost compared with the pure titanium pressure vessel.
In the manufacture of the titanium-steel composite plate pressure vessel, the control of the assembling and attaching gap between the liner cover plate and the shell of each pipe orifice assembly (figure 6) on the equipment is critical, and the allowable tolerance of the gap is generally less than or equal to 0.5mm, because the liner cover plate (the liner cover plate does not bear strength in the use process of the vessel, the liner cover plate does not participate in the strength calculation of the vessel shell in the design process of the vessel, the main effect is corrosion prevention and the like) and the attaching gap of the vessel shell are too large, so that an independent empty cavity is formed between the liner cover plate and the vessel shell, and the cavity can generate fatigue stress to the liner cover plate and the connecting weld joint of the liner cover plate and the shell, so that the liner cover plate and the connecting weld joint of the liner cover plate and the shell are in a reciprocating fatigue state, and the risk of failure of the liner cover plate and the shell is increased.
Aiming at the possibility of the risk, at present, the bonding gap between the cover plate and the shell cladding is reduced by adopting modes of manual hammering, coping and the like after flame baking aiming at a gap distribution area, the effect that the gap is less than or equal to 0.5mm is difficult to achieve, and knocking pits, coping scratches and the like which influence the corrosion resistance of the titanium cover plate are extremely easy to form on the surface of the titanium cover plate in the process of reducing the bonding gap between the cover plate and the shell cladding in a manual hammering and coping mode.
At present, concentricity of the three parts is found through experience of operators when the die is used for stamping the cover plate, and risks of eccentric pressing of the connecting pipe cover plate, uneven pressing thickness of the connecting pipe cover plate, deep scratch of the connecting pipe cover plate and tearing and scrapping of a parent metal of the liner pipe cover plate caused by insufficient concentricity of the die are carelessly operated.
The cover plate pressing process in the titanium-steel composite plate pressure vessel provides that the cover plate blank is heated to a preset reasonable pressing forming temperature and then is stamped, the stamped cover plate blank is returned to a heat treatment furnace for stress relief heat treatment, the initial pressing temperature, the final pressing temperature and the like are strictly controlled in the stamping process, and the heat loss is caused in the process, so that the realization is realized by consuming a lot of electric quantity.
Disclosure of Invention
The invention mainly aims to provide a liner tube cover plate pressing die, a production method thereof and a liner tube cover plate forming method, wherein the produced cover plate is directly attached to the surface of an installation part by means of the pressing die in the process of assembling with a connecting pipe, attaching gaps between the cover plate and a shell are not required to be reduced by means of manual hammering, grinding and the like, concentricity of the pressing die is further convenient to adjust by means of manual experience when the pressing die is used, and heat loss and energy consumption are further reduced in the process of pressing a cover plate blank.
The aim of the invention can be achieved by adopting the following technical scheme:
the liner tube cover plate pressing die comprises a lower die, an upper die and a stamping head, wherein a channel is penetrated in the central positions of the lower die and the upper die, a space for placing a cover plate blank is formed between the upper die and the lower die, the cover plate blank protrudes outwards relative to the space, the protruding part of the cover plate blank is positioned between the two channels, and the stamping head is used for penetrating into the two channels from top to bottom so as to stamp the protruding part of the cover plate blank;
the corner of the top end of the inner wall of the lower die is in chamfer setting, and an angle R1 is consistent with the connecting pipe flange R1';
the top surface SR1 of the lower die is consistent with the top surface SR1' of the sealing head multi-layer plate;
the stamping head comprises a cylinder body and a stamping plate which are vertically distributed, the stamping plate is of a round platform structure with a large top and a small bottom, and the top corner and the bottom corner of the outer peripheral surface of the stamping plate are arranged in a chamfering way;
the top of the channel of the upper die is provided with a limiting concentric tube, the limiting concentric tube and the upper die are coaxially arranged, the top of the inner wall of the limiting concentric tube is chamfered, and the outer wall of the cylinder body is attached to the inner wall of the limiting concentric tube when the stamping head is inserted in the channel of the upper die, so that the stamping plate and the upper die are coaxially arranged;
the outer wall of lower mould is provided with spacing connecting plate, the outer wall of upper mould is pasted in the inner wall of spacing connecting plate when the upper mould is located the apron blank top at lower mould top, makes upper mould and lower mould coaxial placement.
Preferably, the stamping head further comprises a stamping rod, the stamping rod is arranged on the inner side of the cylinder body, and a plurality of reinforcing rib plates are arranged between the stamping rod and the cylinder body.
Preferably, the die further comprises a bottom plate, a plurality of supporting rib plates are arranged at the top of the bottom plate, the lower die is arranged at the top of the supporting rib plates, a channel penetrates through the central position of the bottom plate, and the diameter of the channel of the bottom plate is respectively larger than the inner diameters of the channels of the lower die and the upper die.
The production method of the liner tube cover plate pressing die comprises the following steps:
step 1, respectively assembling and welding an upper die part, a lower die part and a stamping head;
step 1.1, the assembly welding of the upper die part is specifically as follows:
sequentially fixing the limiting concentric tube and the lifting lug on the top surface of the upper die, so that the limiting concentric tube and the channel of the upper die are coaxially arranged;
step 1.2, the assembly welding of the lower die part is specifically as follows:
fixing a supporting rib plate above a bottom plate, fixing a lower die at the top of the supporting rib plate, and finally adjusting the position of a limit connecting plate and fixing the limit connecting plate on the outer wall of the lower die;
step 1.3, the assembly welding of the stamping head is specifically as follows:
sequentially fixing the stamping rod, the reinforcing rib plate and the cylinder body on the top of the stamping plate, so that the stamping rod is positioned at the central position of the stamping plate;
when the stamping plate and the stamping rod are assembled and welded, firstly, the top surface of the stamping plate is processed, then the bottom surface of the stamping rod is processed by taking the top surface of the stamping plate as a reference, and the whole outer surface of the stamping head is polished after the processing is finished;
step 1.4, performing stress relief heat treatment procedures after respectively performing assembly welding on the upper die part, the lower die part and the stamping head;
step 2, respectively carrying out numerical control processing on the upper die part, the lower die part and the stamping head after assembly welding, so that the outer diameter d and the inner diameter d2 of the lower die, the outer diameter d' and the inner diameter d3 of the upper die meet the requirements, and the outer diameter d4 of the stamping head is processed by taking the size of the inner diameter d3 of the upper die as a reference, thereby ensuring the concentricity of the upper die, the lower die and the stamping head;
in the process, before the upper die part and the lower die part are processed, the upper die part and the lower die part are fixed together through spot welding, the outer circles of the upper die and the lower die are processed firstly to ensure that the outer diameters of the upper die and the lower die are consistent, then the inner diameters of the upper die and the lower die are processed by taking the outer diameters as the reference, and then the convex surface and the concave surface which are contacted with the blank between the upper die and the lower die are processed;
and step 3, processing the top curved surface SR1 of the lower die, the inner wall chamfer R1 of the lower die, the intersecting line curved surface of the connecting pipe flange and the shell and the chamfer R1' of the connecting pipe flange in a numerical control processing center by using the same processing program.
A liner tube cover plate forming method comprises the following steps:
s1, placing a connecting pipe cover plate blank on a lower die of a lower die part, and adjusting the position;
s2, lifting the upper die part horizontally by utilizing a lifting lug on the upper die part to be arranged right above the lower die, dropping the upper die onto the lower die and the connecting pipe cover plate blank by utilizing a limit connecting plate on the lower die, and enabling the connecting pipe cover plate blank to be in contact with the upper die and the lower die, wherein a channel of the upper die and a channel of the lower die are coaxially arranged;
s3, using a press or other devices capable of giving a pressing force to act on the top end face of the limiting concentric tube of the upper die part until the upper die is attached to the connecting tube cover plate blank and the connecting tube cover plate blank is attached to the lower die, and then welding and fixing the upper die and the lower die into a whole through a limiting connecting plate;
s4, placing the upper die part and the lower die part which are welded into a whole into a heat treatment furnace, wherein the heat treatment furnace is positioned on a working platform of a press or other devices giving a pressing force, covering a furnace cover to heat the heat treatment furnace to a preset forming temperature of 565+/-15 ℃, and preserving heat within a preset time range;
s5, opening a furnace cover after heating is finished, and placing a stamping head into a channel of an upper die by means of a stamping rod and a limiting concentric tube until the stamping head contacts with the connecting pipe cover plate blank;
s6, using a press or other devices giving a pressing force to act on the stamping rod, and stopping stamping after the descending distance of the stamping head reaches a preset value;
s7, rapidly covering a furnace cover on the heat treatment furnace after stamping is finished, and starting stress relief heat treatment according to a preset program;
and S8, after stress relief heat treatment is finished, placing the pressing die on a working platform of a press or other devices giving compression force, suspending a bottom plate of the lower die part, separating the stamping head from the connecting pipe cover plate by applying pressure to the stamping rod, and then removing the limiting connecting plate to take out the connecting pipe cover plate.
The heat treatment furnace comprises a furnace body with a cuboid space, wherein heat insulation cotton and heating plates are paved on the inner wall of the furnace body, the heating plates are distributed along the periphery of the furnace wall, and a furnace cover is arranged at the top of the furnace body.
The beneficial technical effects of the invention are as follows:
1. the stamping head, the upper die part and the lower die part in the pressing die have the effect of automatically adjusting concentricity, so that the risks of eccentric pressing and excessive pressing scratches of the connecting pipe cover plate caused by misoperation of adjusting the concentricity by a worker according to operation experience are avoided; in addition, the chamfer angle R1 at the corner of the top end of the inner wall of the lower die is consistent with the connecting pipe flange R1', so that the connecting pipe cover plate is ensured to meet the requirements when being attached to the connecting pipe flange R1', and the appearance of a closed independent cavity is avoided.
2. Three main parts of the pressing die in the present invention: the stamping head, the upper die part and the lower die part can be relatively independent, and the stamping head is not connected with an external press when in use, and the stamping process can be completed by contacting the force-giving surface, so that the process of adjusting the geometric centers of the upper die and the lower die by taking the stamping head as the center with great difficulty is reduced.
3. In the liner tube cover plate forming method, the heating in the forming process and the stress relief heat treatment heating after the forming are both carried out in the heat treatment furnace, so that the duration of the whole pressing process is effectively shortened, the heat loss is reduced, the energy is saved, the adapter tube cover plate is not demoulded in the stress relief heat treatment process after the forming, the deformation of the adapter tube cover plate caused by the stress relief heat treatment is avoided, and the problem of influencing the assembly gap between the adapter tube cover plate and the shell is avoided.
Drawings
FIG. 1 is a schematic diagram of a stamped state of a take-over cover plate according to an embodiment of the invention;
FIG. 2 is a schematic view of a lower die part structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of the upper die part structure according to an embodiment of the present invention;
FIG. 4 is a schematic view of a press head structure according to an embodiment of the present invention;
FIG. 5 is a schematic view showing the structure of a heat treatment furnace and a pressing mold according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of a container closure take over assembly in accordance with an embodiment of the present invention.
In the figure: the device comprises a base plate 1, a first supporting rib plate 2, supporting connecting pipes 3, a limit connecting plate 4, a lower die 5, a second supporting rib plate 6, limit concentric pipes 7, an upper die 8, a lifting lug 9, a punching plate 10, a cylinder 11, a reinforcing rib plate 12, a punching rod 13, a furnace body 14, a furnace cover 15 and a thermocouple 16.
Detailed Description
In order to make the technical solution of the present invention more clear and obvious to those skilled in the art, the present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1 to 6, the liner pipe cover plate pressing mold provided in this embodiment includes an upper mold portion, a lower mold portion, and a pressing head, which may be relatively independent, where the upper mold portion includes an upper mold 8, and the lower mold portion includes a lower mold 5;
a circular channel is penetrated at the central positions of the lower die 5 and the upper die 8, a space for placing a cover plate blank is formed between the upper die 8 and the lower die 5, the cover plate blank protrudes outwards relative to the space, the protruding part of the cover plate blank is positioned between the two circular channels, the cover plate blank is in a plane state (an original state after cutting, and has a circular ring or an elliptical ring-like structure) just positioned between the upper die and the lower die, and a stamping head is used for being inserted into the two channels from top to bottom so as to stamp the protruding part of the cover plate blank;
the corner of the top end of the inner wall of the lower die 5 is in chamfer setting, and the angle R1 is consistent with the connecting pipe flange R1', so that the connecting pipe cover plate can be perfectly attached to the connecting pipe flange R1';
the top surface of the lower die 5 is of a curved surface structure, the curved surface SR1 is consistent with the top surface SR1' of the end socket cladding plate, a seamless gap is ensured after the connecting pipe cover plate is attached to the end socket cladding, the processing size of the curved surface radius SR2 of the upper die 8 is SR1, the thickness delta of the liner cover plate is the theoretical thickness of the liner cover plate, and the value is the theoretical thickness plus the positive deviation of the thickness of the plate;
the stamping head comprises a cylinder body 11 and a stamping plate 10 which are vertically distributed, the stamping plate 10 is of a round platform structure with a large top and a small bottom, the top and bottom corners of the outer peripheral surface of the stamping plate 10 are respectively provided with a chamfer, the top chamfer R5 and the bottom chamfer R4 are respectively provided with a chamfer, the top end of the outer wall of the cylinder body 11 is provided with a chamfer R6, and the defects of scratches, scratches and the like caused by butt joint of a pipe cover plate in the pressing process and the demolding process of the pipe cover plate are effectively avoided;
the top of the channel of the upper die 8 is provided with a limiting concentric tube 7, the limiting concentric tube 7 and the upper die 8 are coaxially arranged, the top of the inner wall of the limiting concentric tube 7 is in chamfer arrangement, and the outer wall of a cylinder 11 is attached to the inner wall of the limiting concentric tube 7 when a stamping head is inserted in the channel of the upper die 8, so that a stamping plate 10 and the upper die 8 are coaxially arranged, and the quick and accurate automatic concentricity adjustment of the stamping head and the upper die in the assembly process can be ensured;
the outer wall of the lower die 5 is provided with six limit connecting plates 4, the limit connecting plates 4 are distributed at intervals along the circumferential direction of the outer wall of the lower die 5 and are used for centering the upper die and the lower die, so that the concentricity of the upper die and the lower die can be quickly and accurately automatically adjusted in the assembly process, the upper die 8 is connected and fixed after being pressed, the outer wall of the upper die 8 is attached to the inner wall of the limit connecting plate 4 when the upper die 8 is positioned above a cover plate blank at the top of the lower die 5, the upper die 8 and the lower die 5 are coaxially placed, the limit connecting plate 4 comprises an inclined part and a vertical part which are distributed up and down, the vertical part is welded with the outer side surface (downwards vertical) of the lower die 5, the vertical part is upwards protruded out of the outer side surface of the lower die 5, and the inclined part is outwards inclined, so that the upper die 8 falls down in the assembly process is convenient, and centering is convenient to find;
the concentricity of the upper die, the lower die and the stamping head is automatically adjusted through the limiting connecting plate 4 and the limiting concentric tube 7, so that the problem that the stamping quality of the connecting tube cover plate is affected due to excessive heat loss of the stamped connecting tube cover plate blank caused by long time of manual concentricity adjustment due to errors of experience concentricity adjustment of operators is avoided.
In this embodiment, as shown in fig. 1, the stamping head further includes a stamping rod 13, the stamping rod 13 is disposed on the inner side of the cylinder 11, and a plurality of reinforcing ribs 12 are disposed between the stamping rod 13 and the cylinder 11.
In this embodiment, as shown in fig. 1, the stamping die further comprises a bottom plate 1, the flatness of the bottom plate 1 is less than or equal to 0.5mm, a plurality of supporting rib plates are arranged at the top of the bottom plate 1, the lower die 5 is arranged at the top of the plurality of supporting rib plates, a channel, namely a 1-position circular plate of the bottom plate, is penetrated at the central position of the bottom plate 1, the channel diameter of the bottom plate 1 is respectively larger than the channel inner diameters of the lower die 5 and the upper die 8, and the stamping head is convenient to strip after stamping is finished.
In this embodiment, as shown in fig. 1, the support rib plate comprises a first support rib plate 2 and a second support rib plate 6, the first support rib plate 2 and the second support rib plate 6 are all provided with three, and they are uniformly distributed along the circumference direction of the bottom plate 1, they are used for reinforcing the overall rigidity of the lower die 5, the second support rib plate 6 is provided with a circular lifting hole, and the second support rib plate 6 is used as a lifting lug when lifting the lower die part, a support connection pipe 3 is arranged between the first support rib plate 2 and the second support rib plate 6, the support connection pipe 3 mainly plays a supporting role, and the lower die 5 is arranged at the top of the first support rib plate 2, the support connection pipe 3 and the second support rib plate 6.
In the embodiment, the stamping head is the biggest characteristic that the stamping head is used as a relatively independent component, and is not required to be fixed with a press before stamping, so long as the stamping head is fully contacted with a force giving surface of the press in the pressing process, and the link of centering the press and the lower die is reduced.
The production method of the liner tube cover plate pressing die comprises the following steps:
step 1, respectively assembling and welding an upper die part, a lower die part and a stamping head;
step 1.1, the assembly welding of the upper die part is specifically as follows:
sequentially fixing the limiting concentric tube 7 and the lifting lug 9 on the top surface of the upper die 8, so that the limiting concentric tube 7 and a channel of the upper die 8 are coaxially arranged;
step 1.2, the assembly welding of the lower die part is specifically as follows:
fixing a supporting rib plate above the bottom plate 1, fixing a lower die 5 at the top of the supporting rib plate, and finally adjusting the position of a limit connecting plate 4 and fixing the limit connecting plate on the outer wall of the lower die 5;
step 1.3, the assembly welding of the stamping head is specifically as follows:
the stamping rod 13, the reinforcing rib plate 12 and the cylinder 11 are sequentially fixed on the top of the stamping plate 10, so that the stamping rod 13 is positioned at the central position of the stamping plate 10;
when the stamping plate 10 and the stamping rod 13 are assembled and welded, firstly, the top surface of the stamping plate 10 is processed, then, the bottom surface of the stamping rod 13 is processed by taking the top surface of the stamping plate 10 as a reference, and after the processing is finished, the whole outer surface of the stamping head is polished;
the parallelism of the end surfaces of the stamping rod 13 and the stamping plate 10 and the overall surface finish of the stamping head are ensured to meet the requirements, so that the equilibrium and stability of the stamping rod 13 in the stress process are ensured, and the defects of eccentric pressing of the connecting pipe lining plate, uneven pressing forming thickness, pressing scratch and the like caused by uneven stress of the stamping rod 13 can be effectively avoided.
Step 1.4, performing stress relief heat treatment procedures after respectively performing assembly welding on the upper die part, the lower die part and the stamping head;
step 2, respectively carrying out numerical control processing on the upper die part, the lower die part and the stamping head after assembly welding, so that the outer diameter d and the inner diameter d2 of the lower die 5, the outer diameter d 'and the inner diameter d3 of the upper die 8 meet the requirements, and the outer diameter d4 of the stamping head is processed by taking the size of the inner diameter d3 of the upper die 8 as a reference, so that concentricity of the upper die, the lower die and the stamping head is ensured, the inner diameter d3 of the limiting concentric tube 7 is matched with the outer diameter d4 of the stamping head, and the influence of the thermal expansion d3' of the die and the connecting tube cover plate when the die is heated integrally is subtracted from the actual processing size d3, so that the concentricity of the stamping head 10, the upper die and the lower die can be further ensured under the hot stamping state, and the processing is carried out after assembly welding is finished and stress relief heat treatment is realized, namely, the influence of welding stress release on processing precision in the processing process is eliminated to the greatest extent before processing;
in the process, before the upper die part and the lower die part are processed, the upper die part and the lower die part are fixed together through spot welding, the outer circles of the upper die and the lower die are processed firstly, so that the outer diameters of the upper die and the lower die are convenient to be consistent, then the inner diameters of the upper die and the lower die are processed by taking the outer diameters as references, and then the convex surface and the concave surface which are contacted with the blank between the upper die and the lower die are processed, so that the contour gap between the concave surface and the convex surface can press the cover plate blank into a required shape, and the first-step forming process of the cover plate blank is completed, so that concentricity is more beneficial to being ensured;
step 3, the curved surface SR1 at the top of the lower die 5, the chamfer R1 at the inner wall of the lower die 5, the intersecting line curved surface of the connecting pipe flange and the shell (the main body/shell of the titanium composite plate pressure vessel, such as a sealing head, a cylinder body and the like) and the chamfer R1 'of the connecting pipe flange are processed by the same processing program in a numerical control processing center, so that the R1 position die with the most difficult control of the whole gap is ensured to be consistent with the chamfer R1' of the connecting pipe on the titanium composite plate pressure vessel, and the connecting pipe cover plate is ensured to be bonded with the connecting pipe flange without gaps after being pressed and formed.
In this embodiment, after the upper and lower mold portions are machined, they can be separated to facilitate subsequent placement of the cover blank between the upper and lower molds.
A liner tube cover plate forming method comprises the following steps:
s1, placing a connecting pipe cover plate blank on a lower die 5 of a lower die part, and adjusting the position;
s2, horizontally lifting the upper die part by utilizing a lifting lug 9 on the upper die part to be arranged right above the lower die 5, and lowering the upper die 8 onto the lower die 5 and a connecting pipe cover plate blank by utilizing a limit connecting plate 4 on the lower die 5, wherein the connecting pipe cover plate blank is contacted with the upper die and the lower die, and at the moment, a channel of the upper die 8 and a channel of the lower die 5 are coaxially arranged;
s3, using a press or other devices capable of giving a pressing force to act on the top end surface of a limiting concentric tube 7 of the upper die part until the upper die 8 is tightly attached to the connecting tube cover plate blank and the connecting tube cover plate blank is tightly attached to the lower die 5, wherein the cold preforming process (first step forming) of the connecting tube cover plate blank is carried out, namely, the upper die and the lower die are in a pressing state, so that the shape of the connecting tube cover plate blank is consistent with that of a middle cavity of the upper die and the lower die, namely, the upper die and the lower die are in a pressing state, and then the upper die and the lower die are welded and fixed into a whole through a limiting connecting plate 4, so that the upper die and the lower die are mainly firmly connected, the forming effect of the cover plate is prevented from being influenced due to looseness between the upper die and the lower die in the subsequent process, and deformation after demoulding or heat treatment (R formed by preforming deformation and hot flanging all need to be protected) is furthest reduced;
s4, placing the upper and lower die parts welded into a whole into a heat treatment furnace, wherein the heat treatment furnace is positioned on a working platform of a press or other devices giving compression force, covering a furnace cover to heat to a preset forming temperature of 565+/-15 ℃, and preserving heat for 10min;
s5, opening a furnace cover after heating is finished, and placing a stamping head into a channel of the upper die 8 by means of the stamping rod 13 and the limiting concentric tube 7 until the stamping head contacts with the connecting tube cover plate blank;
step S6, using a press or other devices giving a pressing force to act on the pressing rod 13, and stopping pressing after the descending distance of the pressing head reaches a preset value;
s7, after stamping, rapidly covering a furnace cover on a heat treatment furnace, starting stress relief heat treatment according to a preset program, wherein the temperature is 550+/-10 ℃, and the heat preservation time is 30 minutes, wherein the connecting pipe cover plate is not separated from the pressing mold in the process, so that deformation caused by the stress relief heat treatment process is effectively avoided, the connecting pipe cover plate is not required to be separated from the pressing mold in the stress relief heat treatment process after the forming of the connecting pipe cover plate, but is heated together with the mold, and the exceeding of the bonding gap between the connecting pipe cover plate and the connecting pipe flange caused by deformation caused by the demolding heat treatment of the connecting pipe cover plate can be effectively avoided; the stress relief heat treatment after the formation of the connecting pipe cover plate is directly conducted to heat after the heat treatment furnace cover is covered after the pressing is finished, and the pressing die and the connecting pipe cover plate do not need to be taken out of the heat treatment furnace in the process, so that the temperature after the pressing of the pressing die and the connecting pipe cover plate is finished is high, the heating time of the heat treatment can be greatly shortened after the heating is continued, the efficiency of the pressing process is improved, and the manufacturing cost of labor, energy sources and the like is saved;
and S8, after stress relief heat treatment is finished, placing a pressing die on a working platform of a press or other devices giving pressing force, suspending a bottom plate 1 of a lower die part, separating a stamping head from a connecting pipe cover plate by applying pressure to a stamping rod 13, removing a limit connecting plate, taking out the connecting pipe cover plate, and cutting the limit connecting plate 4, the upper die and the lower die by using a grinding wheel cutting piece, wherein the limit connecting plate 4 can be a disposable article.
In this embodiment, after the cover plate and the adapter are assembled, the integral fit of the cover part of the cover plate and the seal head or the cylinder is within 0.5 mm.
In this embodiment, the heating process before the forming of the take-over cover plate and the stress relief heat treatment process after the forming are both performed in the heat treatment furnace, the heat treatment furnace is put on the press working platform for power-on working in the heating process, the furnace cover of the heat treatment furnace is opened after the heating is finished, and the punching process can be performed by putting the punching head, so that the heat loss in the take-over blank transferring process and the centering process of the punching die is effectively avoided, the initial pressing temperature and the final pressing temperature in the pressing process can be accurately controlled, and the pressing quality of the take-over cover plate is ensured.
In this embodiment, the heating rate of the forming heating process and the stress relief heat treatment heating process is not higher than 100 ℃ per hour when the temperature is not lower than 250 ℃.
In the embodiment, the stamping head has the greatest characteristic that the stamping head does not need to be fixed with the press before stamping, and only needs to be fully contacted with the force supply surface of the press in the pressing process, so that the link of centering the press and the lower die is reduced.
A heat treatment furnace comprises a furnace body 14 with a cuboid space, wherein heat preservation cotton and heating plates are paved on the inner wall of the furnace body 14, the heating plates are distributed along the periphery of a furnace wall, and a furnace cover 15 is arranged at the top of the furnace body 14; the heat treatment furnace is internally provided with a certain number of thermocouples 16, the thermocouples 16 are connected with an integrated temperature control digital display system, so that the furnace temperature and the temperature condition in the heating process of the cover plate blank can be accurately monitored, a heat treatment curve in the heating process can be accurately printed, and the program adjustment of the furnace temperature is facilitated according to the heat treatment curve;
the heat treatment furnace is characterized in that the size is designed and manufactured according to the actual size of a connecting pipe cover plate pressed according to the requirement and the size of a working table surface of a press, heat preservation cotton with enough thickness is paved on the periphery, the bottom and the top of the inside of the heat treatment furnace, heating sheets are distributed along the periphery of the wall of the heat treatment furnace, the heating process is not in contact with a connecting pipe cover plate blank, the heating process is adopted to heat the connecting pipe cover plate blank in a heat radiation mode, the heating uniformity and the heating speed uniformity are ensured, and the quality defects of serious local oxidation and the like of the connecting pipe cover plate blank caused by uneven heating in the heating process are avoided.
In summary, in the method for forming the liner pipe cover plate provided in this embodiment, heating in the forming process and heating in the stress relief heat treatment after forming are performed in the heat treatment furnace, so that the duration of the whole pressing process is effectively shortened, the heat loss is reduced, the energy is saved, the adapter pipe cover plate is not demolded in the stress relief heat treatment process after forming, deformation of the adapter pipe cover plate caused by the stress relief heat treatment is avoided, and therefore, the problem of influencing the assembly gap between the adapter pipe cover plate and the shell is avoided.
The above description is merely a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art will be able to apply equivalents and modifications according to the technical solution and the concept of the present invention within the scope of the present invention disclosed in the present invention.
Claims (2)
1. A production method of a liner tube cover plate pressing die is characterized by comprising the following steps of: the liner tube cover plate pressing die comprises a lower die (5), an upper die (8) and a stamping head, wherein a channel is penetrated in the central positions of the lower die (5) and the upper die (8), a space for placing a cover plate blank is formed between the upper die (8) and the lower die (5), the cover plate blank protrudes outwards relative to the space, the protruding part of the cover plate blank is positioned between the two channels, and the stamping head is used for penetrating into the two channels from top to bottom so as to stamp the protruding part of the cover plate blank;
the corner of the top end of the inner wall of the lower die (5) is in chamfer setting, and an angle R1 is consistent with the connecting pipe flange R1';
the stamping head comprises a cylinder body (11) and a stamping plate (10) which are vertically distributed, the stamping plate (10) is of a round platform structure with a large top and a small bottom, and the top corner and the bottom corner of the outer peripheral surface of the stamping plate (10) are arranged in a chamfering way;
the upper die is characterized in that a limiting concentric tube (7) is arranged at the top of a channel of the upper die (8), the limiting concentric tube (7) and the upper die (8) are coaxially arranged, the top of the inner wall of the limiting concentric tube (7) is in chamfer arrangement, and the outer wall of a cylinder body (11) is attached to the inner wall of the limiting concentric tube (7) when a stamping head is inserted into the channel of the upper die (8), so that a stamping plate (10) and the upper die (8) are coaxially arranged;
the outer wall of the lower die (5) is provided with a limit connecting plate (4), and when the upper die (8) is positioned above a cover plate blank at the top of the lower die (5), the outer wall of the upper die (8) is attached to the inner wall of the limit connecting plate (4), so that the upper die (8) and the lower die (5) are coaxially arranged;
the pressing die further comprises a bottom plate (1), a plurality of supporting rib plates are arranged at the top of the bottom plate (1), the lower die (5) is arranged at the top of the supporting rib plates, a channel penetrates through the central position of the bottom plate (1), and the channel diameter of the bottom plate (1) is respectively larger than the channel inner diameters of the lower die (5) and the upper die (8);
the stamping head further comprises a stamping rod (13), the stamping rod (13) is arranged on the inner side of the cylinder body (11), and a plurality of reinforcing rib plates (12) are arranged between the stamping rod (13) and the cylinder body (11);
the production method comprises the following steps:
step 1, respectively assembling and welding an upper die part, a lower die part and a stamping head;
step 1.1, the assembly welding of the upper die part is specifically as follows:
sequentially fixing a limiting concentric tube (7) and lifting lugs (9) on the top surface of an upper die (8), and enabling the limiting concentric tube (7) and a channel of the upper die (8) to be coaxially arranged;
step 1.2, the assembly welding of the lower die part is specifically as follows:
fixing a supporting rib plate above the bottom plate (1), fixing a lower die (5) at the top of the supporting rib plate, and finally adjusting the position of a limit connecting plate (4) and fixing the limit connecting plate on the outer wall of the lower die (5);
step 1.3, the assembly welding of the stamping head is specifically as follows:
the stamping rod (13), the reinforcing rib plate (12) and the cylinder body (11) are sequentially fixed on the top of the stamping plate (10), so that the stamping rod (13) is positioned at the central position of the stamping plate (10);
when the stamping plate (10) and the stamping rod (13) are assembled and welded, firstly, the top surface of the stamping plate (10) is processed, then the bottom surface of the stamping rod (13) is processed by taking the top surface of the stamping plate (10) as a reference, and the whole outer surface of the stamping head is polished after the processing is finished;
step 1.4, performing stress relief heat treatment procedures after respectively performing assembly welding on the upper die part, the lower die part and the stamping head;
step 2, respectively carrying out numerical control processing on the upper die part, the lower die part and the stamping head after assembly welding, so that the outer diameter d and the inner diameter d2 of the lower die (5), the outer diameter d' and the inner diameter d3 of the upper die (8) meet the requirements, and the outer diameter d4 of the stamping head is processed by taking the size of the inner diameter d3 of the upper die (8) as a reference, thereby ensuring the concentricity of the upper die, the lower die and the stamping head;
in the process, before the upper die part and the lower die part are processed, the upper die part and the lower die part are fixed together through spot welding, the outer circles of the upper die and the lower die are processed firstly to ensure that the outer diameters of the upper die and the lower die are consistent, then the inner diameters of the upper die and the lower die are processed by taking the outer diameters as the reference, and then the convex surface and the concave surface which are contacted with the blank between the upper die and the lower die are processed;
and step 3, processing the top curved surface SR1 of the lower die (5), the inner wall chamfer R1 of the lower die (5), the intersecting line curved surface of the connecting pipe flange and the shell and the connecting pipe flange chamfer R1' in a numerical control processing center by using the same processing program.
2. A liner tube cover plate forming method is characterized in that: the molding method using the liner cover plate pressing mold of claim 1;
the molding method comprises the following steps:
s1, placing a connecting pipe cover plate blank on a lower die (5) of a lower die part, and adjusting the position;
s2, horizontally lifting the upper die part by utilizing a lifting lug on the upper die part to be arranged right above the lower die (5), and lowering the upper die (8) onto the lower die (5) and a connecting pipe cover plate blank by utilizing a limit connecting plate (4) on the lower die (5), wherein the connecting pipe cover plate blank is contacted with the upper die and the lower die, and at the moment, a channel of the upper die (8) and a channel of the lower die (5) are coaxially arranged;
s3, using a press or other devices capable of giving a pressing force to act on the top end face of the limiting concentric tube of the upper die part until the upper die (8) is attached to the connecting tube cover plate blank and the connecting tube cover plate blank is attached to the lower die (5), and then welding and fixing the upper die and the lower die into a whole through a limiting connecting plate (4);
s4, placing the upper die part and the lower die part which are welded into a whole into a heat treatment furnace, wherein the heat treatment furnace is positioned on a working platform of a press or other devices giving a pressing force, covering a furnace cover to heat the heat treatment furnace to a preset forming temperature of 565+/-15 ℃, and preserving heat within a preset time range;
s5, opening a furnace cover after heating is finished, and placing a stamping head into a channel of an upper die (8) by means of a stamping rod (13) and a limiting concentric tube (7) until the stamping head contacts with a connecting pipe cover plate blank;
s6, using a press or other devices giving a pressing force to act on the stamping rod (13), and stopping stamping after the descending distance of the stamping head reaches a preset value;
s7, rapidly covering a furnace cover on the heat treatment furnace after stamping is finished, and starting stress relief heat treatment according to a preset program;
s8, after stress relief heat treatment is finished, placing a pressing die on a working platform of a press or other devices giving compression force, suspending a bottom plate (1) of a lower die part, separating a stamping head from a connecting pipe cover plate by applying pressure to a stamping rod (13), and then removing a limiting connecting plate to take out the connecting pipe cover plate;
the heat treatment furnace in the forming method comprises a furnace body with a cuboid space, heat preservation cotton and heating plates are paved on the inner wall of the furnace body, the heating plates are distributed along the periphery of the furnace wall, and a furnace cover is arranged at the top of the furnace body.
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| CN202211078635.4A CN115415408B (en) | 2022-09-05 | 2022-09-05 | Pipe connecting cover plate pressing die, production method thereof and liner pipe cover plate forming method |
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| CN202211078635.4A CN115415408B (en) | 2022-09-05 | 2022-09-05 | Pipe connecting cover plate pressing die, production method thereof and liner pipe cover plate forming method |
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