CN111974866B - Be used for fashioned mould of two card pressure pipes - Google Patents
Be used for fashioned mould of two card pressure pipes Download PDFInfo
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- CN111974866B CN111974866B CN202010735128.8A CN202010735128A CN111974866B CN 111974866 B CN111974866 B CN 111974866B CN 202010735128 A CN202010735128 A CN 202010735128A CN 111974866 B CN111974866 B CN 111974866B
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- 238000007789 sealing Methods 0.000 claims abstract description 134
- 238000003825 pressing Methods 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 238000000465 moulding Methods 0.000 claims abstract description 12
- 238000004080 punching Methods 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 description 24
- 238000000034 method Methods 0.000 description 21
- 230000008569 process Effects 0.000 description 15
- 238000007493 shaping process Methods 0.000 description 12
- 238000003780 insertion Methods 0.000 description 10
- 230000037431 insertion Effects 0.000 description 10
- 230000010349 pulsation Effects 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/045—Closing or sealing means
-
- 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
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to the technical field of high-pressure forming dies, and discloses a die for forming a double-clamping and pressing pipe, which comprises: the fixed die is provided with at least one first cavity matched with the outer surface of the double-clamping pressing pipe, and two sides of the first cavity are open sides; the movable die is movable relative to the top end of the fixed die, and is provided with a second cavity matched with the first cavity, and two sides of the second cavity are open sides; the punch heads are arranged in pairs, the two punch heads are respectively connected to two opposite sides of the fixed die and the movable die in a sliding mode, one punch head is provided with a perforation allowing liquid medium to circulate, the outline edge of the punch head is provided with a flaring section, a low-pressure sealing section and a high-pressure sealing section which are sequentially arranged from the end part, the flaring section is used for expanding the inner diameter of a blank pipe, and the high-pressure sealing section is provided with a first side and a second side which are oppositely arranged. The invention can achieve the purposes of small molding pressure of the double-clamping and pressing pipe and small damage to pipe blanks.
Description
Technical Field
The invention relates to the technical field of internal high-pressure forming dies, in particular to a die for forming a double-clamping-pressing pipe.
Background
At present, the shaping of double cassette card pressure pipe mainly is realized with the mode of water bulge shaping, and the production flow of double cassette card pressure pipe is, after hydraulic pressure mode locking hydro-cylinder locked to cover half and movable mould, the power cylinder that is located cover half and movable mould both sides drives the drift and inserts the inner chamber of base pipe, simultaneously with outer die cavity cooperation for the pipe wall produces the interference volume, forms a sealed cavity, and finally is injected the ultra-high pressure medium in to the sealed cavity by ultra-high pressure generating device, simultaneously, two drifts are the opposite movement, in order to make double cassette card pressure pipe can shaping.
However, the technology of processing the pipe blank by the ultrahigh-pressure liquid medium has the following disadvantages: (1) The high-pressure sealing cover is in interference fit with the inner wall of the blank pipe, the outer wall of the blank pipe and the inner wall of the die cavity, and in the process of forming the double-clamping and pressing pipe, the blank pipe material can be subjected to tensile stress and compressive stress at the same time, and damage to the blank pipe is easy to occur, so that the blank pipe is scrapped; (2) Because the tube blank is easy to burst, when the die is arranged into a plurality of cavities, other tube blanks cannot be molded due to pressure loss, so that the tube blank is wasted; (3) Because the molding pressure is high, the required mold locking force is high, so that the structure of the molding equipment is complex, and the cost is high.
Disclosure of Invention
The purpose of the invention is that: the invention provides a die for forming a double-clamping and pressing pipe, which aims to achieve the purposes of small forming pressure of the double-clamping and pressing pipe and small damage to a pipe blank.
In order to achieve the above object, the present invention provides a die for forming a dual-clamping and pressing pipe, which is suitable for processing a blank pipe to form a dual-clamping and pressing pipe, the dual-clamping and pressing pipe is provided with a first insertion pipe body and a sealing pipe body which are sequentially arranged from outside to inside, the first insertion pipe body and the sealing pipe body are respectively provided with two, and the die comprises:
The fixed die is provided with at least one first cavity matched with the outer surface of the double-clamping pressing pipe, and two sides of the first cavity are open sides;
The movable die is movable relative to the top end of the fixed die and is provided with a second cavity matched with the first cavity, and two sides of the second cavity are open sides;
the punching heads are arranged in pairs, the two punching heads are respectively connected to two opposite sides of the fixed die and the movable die in a sliding mode, one punching head is provided with a through hole for allowing liquid medium to circulate, the outline edge of the punching head is provided with a flaring section, a low-pressure sealing section and a high-pressure sealing section which are sequentially arranged from the end part, the flaring section is used for expanding the inner diameter of the blank pipe, the high-pressure sealing section is provided with a first side and a second side which are oppositely arranged, the first side is connected with the low-pressure sealing section, a containing cavity for containing the blank pipe part is arranged between the high-pressure sealing section and the low-pressure sealing section, and the high-pressure sealing section corresponds to the first plug pipe body and the sealing pipe body part;
The fixed die and the movable die comprise a first connecting section and a second connecting section which are sequentially arranged from outside to inside, the second connecting section corresponds to the sealing pipe body part, and one side, connected with the first connecting section, of the second connecting section is set to be a third side; when the first cavity and the second cavity are matched to form a cavity for molding the double-clamping and pressing pipe, the space between the first connecting section of the fixed die and the first connecting section of the movable die is equal to the diameter of the second side.
In some embodiments of the present application, the high-pressure sealing section includes a first high-pressure sealing section and a second high-pressure sealing section integrally connected with the first high-pressure sealing section, the first high-pressure sealing section is connected with the low-pressure sealing section, and the second high-pressure sealing section is adapted to the first connecting section;
The first side is arranged on the arc section, and the second side is arranged on the first high-pressure sealing section.
In some embodiments of the present application, the dual-clamping-pressing pipe further has a connecting pipe body and two second inserting pipe bodies, where the first inserting pipe body, the sealing pipe body, the second inserting pipe body and the connecting pipe body are sequentially arranged from outside to inside, and the fixed mold and the movable mold further include two third connecting sections and a fourth connecting section, and the third connecting section and the fourth connecting section correspond to the second inserting pipe body and the connecting pipe body respectively;
the second connecting section further comprises a fourth side which is opposite to the third side, two sides of the fourth connecting section are integrally connected with one sides of the two third connecting sections respectively, and the other side of the third connecting section is integrally connected with the fourth side of the second connecting section.
In some embodiments of the application, the flared section is obliquely arranged, the smallest diameter of the flared section is smaller than the diameter of the blank pipe, and the largest diameter of the flared section is larger than the diameter of the blank pipe.
In some embodiments of the application, the gap between the low pressure seal section and the first, second and third connection sections is greater than the thickness of the blank pipe.
In some embodiments of the application, the sum of the lengths of the flared section and the low pressure seal section along the axial direction of the punch is greater than the sum of the lengths of the second connecting section and the third connecting section along the axial direction of the punch.
In some embodiments of the present application, two sides of the fourth connecting section are respectively in smooth transition with one sides of the two third connecting sections.
In some embodiments of the application, the third connecting section and the fourth connecting section are rounded off.
Compared with the prior art, the die for forming the double-clamping and pressing pipe has the beneficial effects that:
The flaring section is arranged to flare the tube blank, and in the flaring process of the tube blank by the flaring section, the inner wall of the tube blank subjected to flaring is abutted against the periphery of the punch, so that a medium-low pressure metal hard sealing surface is formed by the inner wall of the tube blank subjected to flaring and the low pressure sealing section, meanwhile, medium-pressure liquid medium with constant pressure and constant pulsation frequency enters a sealing cavity surrounded by the medium-low pressure metal hard sealing surface through the perforation of the tube blank, and finally, two ends of the tube blank are respectively abutted against the first sides of the two high pressure sealing sections, and part of the tube blank is inserted into a containing cavity formed between the high pressure sealing section and the low pressure sealing section, so that the initial medium-pressure pre-expansion of the tube blank is realized;
After the initial medium-pressure pre-expansion is carried out on the pipe blank, two ends of the pipe blank are respectively abutted with the high-pressure sealing section, and the pipe blank and the high-pressure sealing section form a high-pressure metal hard sealing surface, so that a liquid medium with constant frequency from low pressure to medium pressure is continuously injected into the pipe blank, a soft male die is formed by the liquid medium, and meanwhile, the two punches move in opposite directions, and the medium-high pressure expansion of the pipe blank is realized under the combined action of the soft male die and the punches; when the high-pressure sealing section of the punch moves to be attached to the third side, the liquid medium is in a pressure maintaining state, the liquid medium performs high-pressure shaping on the pipe blank, and the pipe blank is completely bent to the peripheral wall of the first cavity, the peripheral wall of the second cavity and the peripheral wall of the high-pressure sealing section, so that the high-pressure shaping of the pipe blank is realized;
therefore, the die for forming the double-clamping and pressing pipe has the following advantages:
(1) The low-pressure metal hard sealing surface is formed between the low-pressure sealing section and the tube blank, and the high-pressure metal hard sealing surface is formed between the high-pressure sealing section and the tube blank, so that the high-pressure metal hard sealing surface has a good sealing effect on a liquid medium, and the tube blank only receives the effect of pressure stress in the forming process, so that the formed double-clamping and pressing tube has good quality;
(2) Compared with the prior art that the clamping and pressing pipe is formed by ultrahigh pressure pulsation liquid filling, the die provided by the embodiment of the invention is matched with the medium-high pressure liquid medium to process the pipe blank, so that the forming pressure is low, the die locking force is greatly reduced, the stability of the double clamping and pressing pipe in the forming process is ensured, the die has the advantages of one die and multiple cavities, the forming time of the double clamping and pressing pipe can be shortened, and the working efficiency is improved;
(3) Multiple working procedures are not needed, and the molding is carried out once, so that the working efficiency is improved;
(4) The sealing surface adopts a metal hard sealing principle, so that the performance of the double-clamping and pressing pipe is more reliable, and the surface damage to Shan Kaka pressing pipes is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a die for forming a double-clamping-pressing pipe according to an embodiment of the invention.
Fig. 2 is an exploded view of a die for dual-card crimp tube forming in accordance with an embodiment of the present invention.
Fig. 3 is a schematic structural view of a stationary mold according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a movable mold according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a punch according to an embodiment of the present invention.
Fig. 6 is a schematic structural view of the die and the tube blank under the forming method step S4 according to the embodiment of the present invention.
Fig. 7 is a schematic diagram of the structure of fig. 6 at a.
Fig. 8 is a schematic structural view of the die and the tube blank under the forming method step S5 according to the embodiment of the present invention.
Fig. 9 is a schematic diagram of the structure of fig. 8 at B.
Fig. 10 is a partial schematic view of a double-click crimp tube.
In the figure, 1, a fixed mold; 11. a first connection section; 12. a second connection section; 121. a third side; 122. a fourth side; 13. a third connecting section; 14. a fourth connecting section; 2.a first cavity; 3. a movable mold; 31. A first connection section; 32. a second connection section; 321. a third side; 322. a fourth side; 33. a third connecting section; 34. a fourth connecting section; 4. a second cavity; 5. a punch; 51. a flaring section; 52. a low pressure seal section; 53. a high pressure seal section; 531. a first high pressure seal section; 532. a second high pressure seal section; 6. perforating; 7. a tube blank; 8. a double-clamping pipe; 81. a first insertion tube body; 82. sealing the pipe body; 83. a second insertion tube body; 84. and connecting the pipe body.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 to 10, the present invention provides a mold for forming a dual-clamping and pressing pipe 8, which is suitable for processing a blank pipe to form the dual-clamping and pressing pipe 8, wherein the dual-clamping and pressing pipe 8 is provided with a first insertion pipe body 81 and a sealing pipe body 82 which are sequentially arranged from outside to inside, and the first insertion pipe body 81 and the sealing pipe body 82 are respectively provided with two parts, and the mold comprises:
The fixed mold 1, the fixed mold 1 is provided with at least one first cavity 2 which is matched with the outer surface of the double-clamping pressing pipe 8, and two sides of the first cavity 2 are open sides;
the movable die 3 is movable relative to the top end of the fixed die 1, the movable die 3 is provided with a second cavity 4 matched with the first cavity 2, and two sides of the second cavity 4 are open sides;
The two punches 5 are respectively and slidably connected to two opposite sides of the fixed die 1 and the movable die 3, wherein one punch 5 is provided with a perforation 6 for allowing a liquid medium to circulate, the contour edge of the punch 5 is provided with a flaring section 51, a low-pressure sealing section 52 and a high-pressure sealing section 53 which are sequentially arranged from the end part, the flaring section 51 is used for enlarging the inner diameter of a blank pipe, the high-pressure sealing section 53 is provided with a first side and a second side which are oppositely arranged, the first side is connected with the low-pressure sealing section 52, a containing cavity for containing the blank pipe part is arranged between the high-pressure sealing section 53 and the low-pressure sealing section 52, and the high-pressure sealing section 53 corresponds to the first inserting pipe body 81 and the sealing pipe body 82;
The fixed die 1 and the movable die 3 comprise a first connecting section and a second connecting section which are sequentially arranged from outside to inside, the second connecting section corresponds to the sealing tube 82, and one side, connected with the first connecting section, of the second connecting section is a third side; when the first cavity 2 and the second cavity 4 are matched to form a cavity for molding the double clamping and pressing pipe 8, the interval between the first connecting section of the fixed die 1 and the first connecting section of the movable die 3 is equal to the diameter of the second side.
Based on the arrangement, the flaring section 51 is arranged, the flaring section 51 flares the tube blank 7, the inner wall of the tube blank 7 subjected to flaring is abutted against the periphery of the punch 5 in the process of flaring the tube blank 7 by the flaring section 51, so that a medium-low pressure metal hard sealing surface is formed by the inner wall of the tube blank 7 subjected to flaring and the low pressure sealing section 52, meanwhile, medium-pressure liquid medium with constant pressure and constant pulsation frequency enters a sealing cavity surrounded by the medium-low pressure metal hard sealing surface through the perforation 6 of the tube blank 7, and finally, two ends of the tube blank 7 are respectively abutted against the first sides of the two high pressure sealing sections 53, and part of the tube blank 7 is inserted into a containing cavity formed between the high pressure sealing section 53 and the low pressure sealing section 52, so that the initial medium-pressure pre-expansion of the tube blank 7 is realized;
After the initial medium-pressure pre-expansion is carried out on the pipe blank 7, two ends of the pipe blank 7 are respectively abutted against the high-pressure sealing section 53, and the pipe blank 7 and the high-pressure sealing section 53 form a high-pressure metal hard sealing surface, so that a liquid medium with constant frequency from low pressure to medium pressure is continuously injected into the pipe blank 7, a soft male die is formed by the liquid medium, and simultaneously, the two punches 5 move oppositely, and the medium-high pressure expansion of the pipe blank 7 is realized under the combined action of the soft male die and the punches 5; when the high-pressure sealing section 53 of the punch 5 moves to be attached to the third side, the liquid medium is in a pressure maintaining state, the liquid medium performs high-pressure shaping on the tube blank 7, and the tube blank 7 is completely bent to the peripheral wall of the first cavity 2, the peripheral wall of the second cavity 4 and the peripheral wall of the high-pressure sealing section 53, so that the high-pressure shaping of the tube blank 7 is realized;
therefore, the die for forming the double-clamping and clamping pipe 8 has the following advantages:
(1) A low-pressure metal hard sealing surface is formed between the low-pressure sealing section 52 and the tube blank 7, and a high-pressure metal hard sealing surface is formed between the high-pressure sealing section 53 and the tube blank 7, so that the high-pressure metal hard sealing surface has a good sealing effect on a liquid medium, and the tube blank 7 only receives the action of pressure stress in the forming process, so that the formed double-clamping and pressing tube 8 has good quality;
(2) Compared with the prior art that the clamping and pressing pipe is formed by ultrahigh pressure pulsation liquid filling, the die provided by the embodiment of the invention is matched with the medium-high pressure liquid medium to process the pipe blank 7, so that the forming pressure is low, the die locking force is greatly reduced, the stability of the double clamping and pressing pipe 8 in the forming process is ensured, the die has the advantage of multiple cavities in one die, the forming time of the double clamping and pressing pipe 8 can be shortened, and the working efficiency is improved;
(3) Multiple working procedures are not needed, and the molding is carried out once, so that the working efficiency is improved;
(4) The sealing surface adopts a metal hard sealing principle, so that the performance of the double-clamping and pressing pipe 8 is more reliable, and the surface damage to Shan Kaka pressing pipes is reduced.
In some embodiments of the present invention, as shown in fig. 5 to 9, the high pressure sealing section 53 includes a first high pressure sealing section 531 and a second high pressure sealing section 532 integrally connected to the first high pressure sealing section 531, where the first high pressure sealing section 531 is connected to the low pressure sealing section 52, and the second high pressure sealing section 532 is adapted to the first connecting section; wherein, the first side is disposed on the arc segment, and the second side is disposed on the first high-pressure sealing segment 531. Thus, because the first plug-in section and the sealing section of the double-clamping pressure pipe 8 are smoothly transited, the second high-pressure sealing section 532 can be matched with the first plug-in section and the sealing section; in addition, the gap formed between the first high pressure seal section 531 and the low pressure seal section 52 can accommodate the portion of the tube blank 7, thereby facilitating the formation of a high pressure metal hard seal surface between the high pressure seal section 53 and the tube blank 7.
In some embodiments of the present invention, as shown in fig. 5 to 9, the dual-clamping press pipe 8 further has a connecting pipe body 84 and two second inserting pipe bodies 83, where the first inserting pipe body 81, the sealing pipe body 82, the second inserting pipe body 83 and the connecting pipe body 84 are sequentially arranged from outside to inside, and the fixed mold 1 and the movable mold 3 further include two third connecting sections and a fourth connecting section, and the third connecting section and the fourth connecting section correspond to the second inserting pipe body 83 and the connecting pipe body 84 respectively;
The second connecting section further comprises a fourth side which is opposite to the third side, two sides of the fourth connecting section are integrally connected with one sides of the two third connecting sections respectively, the other side of the third connecting section is integrally connected with the fourth side of the second connecting section, the fixed die 1 comprises a first connecting section 11, a second connecting section 12, a third connecting section 13 and a fourth connecting section 14, the second connecting section 12 comprises a third side 121 and a fourth side 122, the movable die 3 comprises a first connecting section 31, a second connecting section 32, a third connecting section 33 and a fourth connecting section 34, and the second connecting section 32 comprises a third side 321 and a fourth side 322. It is to be noted that, when the first cavity 2 and the second cavity 4 cooperate to form a cavity for molding the double-clamping tube 8, the outer diameter of the tube blank 7 is equal to the gap between the two fourth connecting sections; thus, the high-pressure sealing section 53, the second connecting section, the third connecting section and the fourth connecting section are respectively arranged corresponding to the first inserting pipe body 81, the sealing pipe body 82, the second inserting pipe body 83 and the connecting pipe body 84, thereby facilitating the forming of the double-clamping and pressing pipe 8.
In some embodiments of the present invention, as shown in fig. 5 to 9, the flared section 51 is disposed obliquely, the minimum diameter of the flared section 51 is smaller than the diameter of the blank pipe, and the maximum diameter of the flared section 51 is larger than the diameter of the blank pipe. Thereby, the diameter of the flaring section 51 is smaller than the diameter of the tube blank 7, so that the punch 5 can conveniently enter the inner cavity of the tube blank 7; the flaring section 51 is partially larger in diameter than the tube blank 7 to facilitate flaring of the tube blank 7.
In some embodiments of the present invention, as shown in fig. 5-9, the gaps between the low pressure seal section 52 and the first, second and third connection sections are all greater than the thickness of the blank pipe. Thus, when the inner wall of the tube blank 7 is tightly attached to the low-pressure sealing section 52, a low-pressure metal hard sealing surface is formed between the tube blank 7 and the low-pressure sealing section 52; when the inner wall of the tube blank 7 is separated from the low-pressure sealing section 52, the die and the liquid medium of the embodiment of the invention cooperate to perform high-pressure expansion and high-pressure shaping on the tube blank 7.
In some embodiments of the present invention, as shown in fig. 5 to 9, the sum of the lengths of the flare section 51 and the low-pressure seal section 52 in the axial direction of the punch 5 is larger than the sum of the lengths of the second connecting section and the third connecting section in the axial direction of the punch 5. Thus, compared to the sum of the lengths of the flared section 51 and the low-pressure sealing section 52 in the prior art being far smaller than the sum of the lengths of the second connecting section and the third connecting section, when the punch 5 of the embodiment of the present invention flares the tube blank 7, the flared section 51 can flare the portion of the tube blank 7 corresponding to the first insertion tube body 81, the sealing tube body 82 and the second insertion tube body 83, thereby completing the first flaring of the first insertion tube body 81, the sealing tube body 82 and the second insertion tube body 83.
In some embodiments of the present invention, as shown in fig. 5 to 9, two sides of the fourth connection section are respectively in smooth transition with one sides of the two third connection sections. Because of the smooth transition between the connecting tube 84 and the second plug-in tube, the connection between the third connection section and the fourth connection section can better adapt to the connection between the connecting tube 84 and the second plug-in tube; in addition, the forming process of the connecting pipe 84 and the second inserting pipe is more convenient, and the resistance of the connecting pipe 84 and the second inserting pipe 83 in the forming process is reduced. Specifically, a rounded transition is provided between the third connecting section and the fourth connecting section.
The embodiment of the invention also provides a molding method for molding the double-clamping and pressing pipe 8, which comprises the following steps:
S1, positioning a tube blank 7: positioning the tube blank 7 in the first cavity 2 of the fixed die 1;
S2, die assembly: the movable die 3 descends until the end face of the movable die 3 is attached to the end face of the fixed die 1;
S3, exhausting: liquid medium enters the inner cavity of the tube blank 7 from the perforation 6 of the punch 5, the inner cavity of the tube blank 7 is filled with liquid, and meanwhile, the gas in the tube blank 7 is discharged;
S4, flaring, establishing a medium-low pressure metal hard sealing surface and initial medium-pressure pre-expansion: the two punches 5 move in opposite directions, and the two punches 5 enter the inner cavity of the tube blank 7; meanwhile, medium-pressure liquid medium with constant pressure and constant pulsation frequency is injected into the inner cavity of the tube blank 7, two ends of the tube blank 7 are respectively abutted against the first sides of the two high-pressure sealing sections 53, and part of the tube blank 7 is inserted into a containing cavity formed between the high-pressure sealing sections 53 and the low-pressure sealing sections 52, so that flaring of the tube blank 7, establishment of a medium-low-pressure metal hard sealing surface and initial medium-pressure pre-expansion are completed;
S5, establishing a high-pressure metal hard sealing surface, and performing medium-pressure high-pressure expansion and high-pressure shaping: the two punches 5 continue to move in opposite directions; meanwhile, liquid medium with constant pulsation frequency from medium pressure to high pressure is injected into the inner cavity of the tube blank 7, the liquid medium forms a soft male die, and the tube blank 7 and the high-pressure sealing section 53 form a high-pressure metal hard surface so as to perform high-pressure expansion on the tube blank 7; when the high-pressure sealing section 53 is attached to the second side, the two punches 5 are in a static state, and the liquid medium is in a pressure maintaining state until the tube blank 7 is completely bent to the peripheral wall of the first cavity 2, the peripheral wall of the second cavity 4 and the peripheral wall of the high-pressure sealing section 53, so that high-pressure shaping of the tube blank 7 is realized;
S6, pressure relief: the liquid medium generator is used for injecting liquid medium into the double-clamping and pressing pipe 8 and is used for pushing the power cylinder for moving the punch 5 to release pressure;
s7, die sinking: the movable mould 3 moves upwards, and the formed double-clamping and pressing pipe 8 is taken out.
In step S4, medium-pressure liquid medium with constant pressure and constant pulsation frequency is injected into the inner cavity of the tube blank 7, and the medium-pressure liquid medium provides supporting force for the tube blank 7 to prevent the tube blank 7 from sinking inwards;
Wherein the medium pressure liquid medium in step S4 does not exceed the initial yield force of the material, so that the tube blank 7 is not deformed by the pressure and pulsation frequency of the liquid medium.
In the step S5, experiments prove that the double-clamping pressure pipe 8 can realize high-pressure shaping under the action of a liquid medium with the pressure of 50Mpa-60Mpa, thereby realizing medium-high pressure pulsation liquid filling shaping of Shan Kaka pressure pipes.
In summary, the die for forming the double-clamping and pressing pipe 8 has the following advantages:
(1) A low-pressure metal hard sealing surface is formed between the low-pressure sealing section 52 and the tube blank 7, and a high-pressure metal hard sealing surface is formed between the high-pressure sealing section 53 and the tube blank 7, so that the high-pressure metal hard sealing surface has a good sealing effect on a liquid medium, and the tube blank 7 only receives the action of pressure stress in the forming process, so that the formed double-clamping and pressing tube 8 has good quality;
(2) Compared with the prior art that the clamping and pressing pipe is formed by ultrahigh pressure pulsation liquid filling, the die provided by the embodiment of the invention is matched with the medium-high pressure liquid medium to process the pipe blank 7, so that the forming pressure is low, the die locking force is greatly reduced, the stability of the double clamping and pressing pipe 8 in the forming process is ensured, the die has the advantage of multiple cavities in one die, the forming time of the double clamping and pressing pipe 8 can be shortened, and the working efficiency is improved;
(3) Multiple working procedures are not needed, and the molding is carried out once, so that the working efficiency is improved;
(4) The sealing surface adopts a metal hard sealing principle, so that the performance of the double-clamping and pressing pipe 8 is more reliable, and the surface damage to Shan Kaka pressing pipes is reduced;
(5) According to the die disclosed by the embodiment of the invention, the die is matched with a medium-high pressure liquid medium to process the tube blank 7, the size of the outer contour of the punch 5 can ensure that the inner diameter of the double-clamping and pressing tube 8 meets the design requirement, and the fixed die 1 and the movable die 3 can ensure that the outer diameter of the double-clamping and pressing tube 8 meets the design requirement, so that the dimensional tolerance of the double-clamping and pressing tube is controllable.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (4)
1. The utility model provides a be used for two card to press pipe fashioned mould, it is suitable for to form two card with base pipe processing and presses the pipe, two card press the pipe have from outside to interior first plug pipe body and the sealed body that sets gradually, first plug pipe body with the sealed body all sets up two, its characterized in that includes:
The fixed die is provided with at least one first cavity matched with the outer surface of the double-clamping pressing pipe, and two sides of the first cavity are open sides;
The movable die is movable relative to the top end of the fixed die and is provided with a second cavity matched with the first cavity, and two sides of the second cavity are open sides;
the punching heads are arranged in pairs, the two punching heads are respectively connected to two opposite sides of the fixed die and the movable die in a sliding mode, one punching head is provided with a through hole for allowing liquid medium to circulate, the outline edge of the punching head is provided with a flaring section, a low-pressure sealing section and a high-pressure sealing section which are sequentially arranged from the end part, the flaring section is used for expanding the inner diameter of the blank pipe, the high-pressure sealing section is provided with a first side and a second side which are oppositely arranged, the first side is connected with the low-pressure sealing section, a containing cavity for containing the blank pipe part is arranged between the high-pressure sealing section and the low-pressure sealing section, and the high-pressure sealing section corresponds to the first plug pipe body and the sealing pipe body part;
The fixed die and the movable die comprise a first connecting section and a second connecting section which are sequentially arranged from outside to inside, the second connecting section corresponds to the sealing pipe body part, and one side, connected with the first connecting section, of the second connecting section is set to be a third side; when the first cavity and the second cavity are matched to form a cavity for molding a double-clamping and pressing pipe, the space between the first connecting section of the fixed die and the first connecting section of the movable die is equal to the diameter of the second side;
The high-pressure sealing section comprises a first high-pressure sealing section and a second high-pressure sealing section integrally connected with the first high-pressure sealing section, the first high-pressure sealing section is connected with the low-pressure sealing section, and the second high-pressure sealing section is matched with the first connecting section;
The first side is arranged on the arc section, and the second side is arranged on the first high-pressure sealing section;
The double-clamping pressing pipe is further provided with a connecting pipe body and two second inserting pipe bodies, the first inserting pipe body, the sealing pipe body, the second inserting pipe body and the connecting pipe body are sequentially arranged from outside to inside, the fixed die and the movable die further comprise two third connecting sections and four connecting sections, and the third connecting sections and the fourth connecting sections correspond to the second inserting pipe body and the connecting pipe body respectively;
The second connecting section further comprises a fourth side which is opposite to the third side, two sides of the fourth connecting section are integrally connected with one sides of the two third connecting sections respectively, and the other side of the third connecting section is integrally connected with the fourth side of the second connecting section;
the flaring section is obliquely arranged, the minimum diameter of the flaring section is smaller than the diameter of the blank pipe, and the maximum diameter of the flaring section is larger than the diameter of the blank pipe;
And gaps among the low-pressure sealing section, the first connecting section, the second connecting section and the third connecting section are larger than the thickness of the blank pipe.
2. The die for double-clamping tube forming according to claim 1, wherein a sum of lengths of the flaring section and the low-pressure sealing section in an axial direction of the punch is greater than a sum of lengths of the second connecting section and the third connecting section in the axial direction of the punch.
3. The die for forming the double-clamping and pressing pipe according to claim 1, wherein two sides of the fourth connecting section are in smooth transition with one side of the two third connecting sections respectively.
4. A die for forming a double-clamping pressure pipe according to claim 3, wherein the third connecting section and the fourth connecting section are in rounded transition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010735128.8A CN111974866B (en) | 2020-07-27 | 2020-07-27 | Be used for fashioned mould of two card pressure pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010735128.8A CN111974866B (en) | 2020-07-27 | 2020-07-27 | Be used for fashioned mould of two card pressure pipes |
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| CN111974866A CN111974866A (en) | 2020-11-24 |
| CN111974866B true CN111974866B (en) | 2024-05-10 |
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| CN202010735128.8A Active CN111974866B (en) | 2020-07-27 | 2020-07-27 | Be used for fashioned mould of two card pressure pipes |
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| CN115625250B (en) * | 2022-10-20 | 2023-08-11 | 东北林业大学 | Device and method for correcting shape of additive manufacturing hollow member based on abrasive flow machining |
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| CN111974866A (en) | 2020-11-24 |
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