CN111774468A - Die for single-clamp clamping and pressing pipe forming - Google Patents
Die for single-clamp clamping and pressing pipe forming Download PDFInfo
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- CN111774468A CN111774468A CN202010735129.2A CN202010735129A CN111774468A CN 111774468 A CN111774468 A CN 111774468A CN 202010735129 A CN202010735129 A CN 202010735129A CN 111774468 A CN111774468 A CN 111774468A
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- 238000003825 pressing Methods 0.000 title claims description 8
- 238000007789 sealing Methods 0.000 claims abstract description 67
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 10
- 238000007493 shaping process Methods 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 4
- 238000002788 crimping Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 15
- 238000004080 punching Methods 0.000 abstract description 8
- 239000002184 metal Substances 0.000 description 15
- 230000002093 peripheral effect Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 230000010349 pulsation Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 7
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 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
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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
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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
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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
- B21D26/045—Closing or sealing means
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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
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
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- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to the technical field of internal high-pressure forming dies, and discloses a die for forming a single-clamp clamping pipe, which comprises: the fixed die is provided with at least one first cavity matched with the outer surface of the single-card clamping pipe, and two sides of the first cavity are opening 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 opening sides; the punching heads are arranged in a pair of 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 allowing a liquid medium to flow, the contour edge of the punching head is provided with an expanding section and a high-pressure sealing section, and the expanding section is used for expanding the inner diameter of the tube blank. The invention provides a die for forming a single-clamping pressure pipe, which aims to achieve the aims of few processing procedures of the single-clamping pressure pipe and stable quality of the formed single-clamping pressure pipe.
Description
Technical Field
The invention relates to the technical field of internal high-pressure forming dies, in particular to a die for forming a single-clamp clamping pressure pipe.
Background
At present, the forming of the single-clamp pressure pipe is mainly realized in a mechanical forming mode, and equipment required by the forming mainly comprises a pipe end forming machine and a cold heading machine, wherein the pipe end forming machine and the cold heading machine are combined with a mold to carry out single-head or double-head processing on a pipe blank. The existing processing mode for the double-clamp clamping pipe is water expansion forming, and the water expansion forming has the advantage of one-step forming, but the existing single-clamp clamping pipe cannot be processed by the water expansion forming processing mode because the outer side of a sealing pipe body of the single-clamp clamping pipe is not connected with a straight line section; therefore, the forming process of the single-clamp pressure pipe mainly comprises primary flaring, secondary flaring, pipe end heading ring and shaping, wherein when the single-clamp pressure pipe is processed in a single-head processing mode, the quality of the formed single-clamp pressure pipe is stable, but the forming process of the single-clamp pressure pipe needs eight times; when the processing mode of the single-clamp clamping pressure pipe is double-end processing, the forming efficiency of the single-clamp clamping pressure pipe is high, but the quality of the single-clamp clamping pressure pipe is unstable.
Disclosure of Invention
The invention aims to solve the problems that: the invention provides a die for forming a single-clamping pressure pipe, which aims to achieve the aims of few processing procedures of the single-clamping pressure pipe and stable quality of the formed single-clamping pressure pipe.
In order to achieve the above object, the present invention provides a die for forming a single-seized pipe, which is adapted to machine a pipe blank into the single-seized pipe, the single-seized pipe having two oppositely arranged sealing pipe bodies, and the die comprises:
the fixed die is provided with at least one first cavity matched with the outer surface of the single-card clamping pipe, and two sides of the first cavity are opening 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 opening sides;
the two punches are respectively connected to two opposite sides of the fixed die and the movable die in a sliding mode, one punch is provided with a through hole allowing a liquid medium to flow, the contour edge of the punch is provided with an expanding section and a high-pressure sealing section, and the expanding section is used for expanding the inner diameter of the tube blank;
the fixed die and the movable die both 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, and the side of the second connecting section connected with the first connecting section is a first side; when first die cavity with the cooperation of second die cavity is used for in the time of the fashioned die cavity of single calorie of card pressure tube, the cover half first linkage segment with the movable mould the interval between the first linkage segment with the external diameter of high-pressure seal section equals, the first side of cover half with the interval between the first side of movable mould is greater than the internal diameter in the sealed body outside.
In some embodiments of the present application, the single-clip crimp tube further includes a connection tube body and two insertion tube bodies, two sides of the insertion tube body are respectively connected to one side of the connection tube body and the sealing tube body, the fixed mold and the movable mold both further include two third connection sections and a fourth connection section, and the second connection section, the third connection section and the fourth connection section respectively correspond to the sealing tube body, the insertion tube body and the connection tube body;
the second connecting section further comprises a second side opposite to the first side, two sides of the fourth connecting section are respectively connected with one side of the two third connecting sections, and the other side of each third connecting section is connected with the second side of the second connecting section.
In some embodiments of the present application, the flared section is disposed obliquely, and the minimum diameter of the flared section is smaller than the diameter of the tube blank, and the maximum diameter of the flared section is larger than the diameter of the tube blank.
In some embodiments of the present application, the contour edge of the punch further includes a low-pressure seal segment, the flared segment, the low-pressure seal segment and the high-pressure seal segment are sequentially connected end to end, the flared segment is connected to one side of the low-pressure seal segment, and the flared segment extends obliquely outward toward the low-pressure seal segment, and the diameter of the flared segment gradually increases in a direction approaching the low-pressure seal segment;
and the gap between the low-pressure sealing section and the third connecting section is larger than the thickness of the tube blank.
In some embodiments of the present application, a sum of lengths of the flared section and the low-pressure seal section in the axial direction of the punch is equal to a sum of lengths of the second connecting section and the third connecting section in the axial direction of the punch.
In some embodiments of the present application, two sides of the fourth connecting section are in smooth transition with one side of two of the third connecting sections.
In some embodiments of the present application, the third and fourth connector segments are rounded.
The embodiment of the invention provides a die for a single-clamp clamping pipe, which has the following beneficial effects compared with the prior art:
the flaring section is arranged to flare the pipe blank, and in the process of flaring the pipe blank by the flaring section, the inner wall of the pipe blank after 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 pipe blank after flaring and the periphery of the punch, meanwhile, a medium-pressure liquid medium with constant pressure and constant pulsation frequency enters a sealing cavity enclosed by the medium-low pressure metal hard sealing surface through the perforation of the pipe blank, and finally, two ends of the pipe blank are respectively abutted against the two ultrahigh pressure sealing sections, so that initial medium-pressure pre-bulging of the pipe blank is realized;
after the pipe blank is subjected to initial medium-pressure pre-expansion, the inner wall of the pipe blank and a high-pressure sealing section of the punch form a high-pressure metal hard sealing surface, so that a liquid medium with constant pulse frequency from medium pressure to high pressure is continuously injected into the pipe blank, the liquid medium forms a soft male die, and meanwhile, the two punches move oppositely under the combined action of the soft male die and the punches, so that medium-pressure and high-pressure expansion of the pipe blank is realized; when the high-pressure sealing section of the punch moves to be attached to the first side, the liquid medium is in a pressure maintaining state, the liquid medium performs high-pressure shaping on the tube blank, and the tube blank is completely yielded 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 tube blank is realized;
therefore, the die for the single-clamping pressure pipe has the advantages of low forming pressure, one-step forming, multiple cavities in one die and small die locking force of forming equipment, and can form the single-clamping pressure pipe through water expansion forming, so that the single-clamping pressure pipe has the advantage of stable quality.
Drawings
FIG. 1 is a schematic structural diagram of a mold for single-card pipe crimping according to an embodiment of the present invention.
FIG. 2 is an exploded view of a mold for single card crimp tube molding according to an embodiment of the present invention.
FIG. 3 is a schematic structural diagram of a fixed 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 in the forming method step S4 according to the embodiment of the invention.
Fig. 7 is a schematic view of the structure of fig. 6 at a.
Fig. 8 is a schematic structural view of the die and the tube blank in the forming method step S5 according to the embodiment of the invention.
Fig. 9 is a schematic view of the structure of fig. 8 at B.
FIG. 10 is a schematic view of the structure of the molded single card crimp tube.
In the figure, 1, a fixed die; 11. a first connection section; 12. a second connection section; 121. a first side; 122. a second side; 13. a third connection section; 14. a fourth connection section; 2. a first cavity; 3. moving the mold; 31. a first connection section; 32. a second connection section; 321. a first side; 322. a second side; 33. a third connection section; 34. a fourth connection section; 4. a second cavity; 5. a punch; 51. a flared section; 52. a low pressure seal section; 53. a high pressure seal section; 6. perforating; 7. a pipe blank; 8. a single-card pipe clamping; 81. connecting the pipe body; 82. inserting a pipe body; 83. and sealing the tube body.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 10, a preferred embodiment of the present invention provides a die for forming a single-seized pressure pipe, which is suitable for processing a tube blank 7 into a single-seized pressure pipe 8, wherein the single-seized pressure pipe 8 has two oppositely arranged sealing pipe bodies 83, and the die comprises:
the fixed die 1 is provided with at least one first cavity 2 matched with the outer surface of the single-card clamping pipe 8, and two sides of the first cavity 2 are opening 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 opening sides;
the punching heads 5 are arranged in pairs, the two punching heads 5 are respectively connected to two opposite sides of the fixed die 1 and the movable die 2 in a sliding way, one punching head 5 is provided with a through hole 6 allowing a liquid medium to flow, the contour edge of the punching head 5 is provided with a flaring section 51 and a high-pressure sealing section 53, and the flaring section 51 is used for expanding the inner diameter of the tube blank 7;
the fixed die 1 and the movable die 3 respectively 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 body 83, and the side of the second connecting section connected with the first connecting section is a first side; when the first cavity 2 and the second cavity 4 are matched to form a cavity for single-clamp pipe clamping molding, 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 outer diameter of the high-pressure sealing section 53, and the interval between the first side of the fixed die 1 and the first side of the movable die 3 is larger than the inner diameter of the outermost side of the sealing pipe body 83.
Based on the arrangement, the flaring section 51 is arranged, the flaring section 51 flares the tube blank 7, and in the process that the flaring section 51 flares the tube blank 7, the inner wall of the flared tube blank 7 is abutted against the periphery of the punch 5, so that a medium-low pressure metal hard sealing surface is formed by the inner wall of the flared tube blank 7 and the periphery of the punch 5, meanwhile, a medium-pressure liquid medium with constant pressure and constant pulsation frequency enters a sealing cavity enclosed by the medium-low pressure metal hard sealing surface through the through hole 6 of the tube blank 7, and finally, two ends of the tube blank are respectively abutted against the two ultrahigh pressure sealing sections 53, so that initial medium-pressure pre-bulging of the tube blank 7 is realized;
since when the first cavity 2 and the second cavity 4 are mated to form a mold cavity for single-card crimp tube molding, the interval between the first side of the fixed mold 1 and the first side of the movable mold 3 is larger than the inside diameter of the outermost side of the sealing pipe body 83, so that, when the pipe blank 7 is subjected to high-pressure shaping, the pipe blank 7 and the high-pressure seal section 53 form a high-pressure metal hard seal surface, specifically, after the pipe blank 7 is subjected to initial medium-pressure pre-expansion, two ends of the pipe blank 7 are respectively abutted against the high-pressure sealing sections 53 of the two punches 5, the inner wall of the pipe blank 7 and the high-pressure sealing sections 53 of the punches 5 form a high-pressure metal hard sealing surface, therefore, the liquid medium with constant pulsation frequency from medium pressure to high pressure is continuously injected into the tube blank 7, the liquid medium forms a soft male die, and simultaneously, the two punches 5 move oppositely, under the combined action of the soft male die and the punch 5, the medium-high pressure bulging of the tube blank 7 is realized; when the high-pressure sealing section 53 of the punch 5 moves to be attached to the first 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 completely yields 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 mold for the single-card clamping tube 8 has the advantages of low molding pressure, one-step molding, multiple cavities in one mold and small mold clamping force of molding equipment, and can form the single-card clamping tube 8 through water expansion molding, so that the single-card clamping tube 8 has the advantage of stable quality.
In some embodiments of the present invention, as shown in fig. 6 to 9, the single-card pressing pipe 8 further includes a connecting pipe body 81 and two inserting pipe bodies 82, two sides of each inserting pipe body 82 are respectively connected to one side of the connecting pipe body 81 and the sealing pipe body 83, each of the fixed die 1 and the movable die 3 further includes two third connecting sections and four fourth connecting sections, and the second connecting sections, the third connecting sections and the fourth connecting sections respectively correspond to the sealing pipe body 83, the inserting pipe body 82 and the connecting pipe body 81, wherein the fixed die 1 includes a first connecting section 11, a second connecting section 12, a third connecting section 13 and a fourth connecting section 14, and the second connecting section 12 includes a first side 121 and a second side 122; the movable mold 3 includes a first connecting section 31, a second connecting section 32, a third connecting section 33, and a fourth connecting section 34, the second connecting section 32 including a first side 321 and a second side 322;
the second connecting section further comprises a second side opposite to the first side, the two sides of the fourth connecting section are respectively connected with one sides of the two third connecting sections, and the other side of each third connecting section is connected with the second side of the second connecting section. Firstly, it should be noted that when the first cavity 2 and the second cavity 4 are matched to form a cavity for single-clamp pipe pressing, the outer diameter of the pipe blank 7 is equal to the gap between the two fourth connecting sections; from this, second linkage segment, third linkage segment and fourth linkage segment correspond the setting with sealed body 83, grafting body 82 and connecting tube body 81 respectively to be convenient for the shaping of single calorie of joint pipe 8.
In some embodiments of the present invention, as shown in fig. 5 to 9, the contour edge of the punch 5 further includes a low-pressure sealing section 52, the flared section 51, the low-pressure sealing section 52 and the high-pressure sealing section 53 are sequentially connected end to end, the flared section 51 is connected to one side of the low-pressure sealing section 52, the flared section 51 extends obliquely outward toward the low-pressure sealing section 52, the diameter of the flared section 51 gradually increases in a direction close to the low-pressure sealing section 52, the minimum diameter of the flared section 51 is smaller than the diameter of the tube blank 7, and the maximum diameter of the flared section 51 is larger than the diameter of the tube blank 7;
the gap between the low-pressure seal section 52 and the third connecting section is larger than the thickness of the tube blank 7. Thus, the diameter of the flared section 51 is partially smaller than that of the tube blank 7, thereby facilitating entry of the punch 5 into the inner cavity of the tube blank 7; the diameter of the flared section 51 is partially larger than that of the tube blank 7, thereby facilitating flaring of the tube blank 7;
when the inner wall of the tube blank 7 is tightly attached to the low-pressure sealing section 52, a medium-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 of the embodiment of the invention is matched with a liquid medium to perform high-pressure bulging and high-pressure shaping on the tube blank 7.
In some embodiments of the present invention, as shown in fig. 6 to 9, the sum of the lengths of the flared section 51 and the low-pressure seal section 52 in the axial direction of the punch 5 is equal to the sum of the lengths of the second connecting section and the third connecting section in the axial direction of the punch 5. Therefore, compared with the prior art that the sum of the lengths of the flaring section 51 and the low-pressure sealing section 52 is far smaller than the sum of the lengths of the second connecting section and the third connecting section, when the punch 5 according to the embodiment of the invention flares the tube blank 7, the flaring section 51 flares the portions of the sealing tube body 83 and the insertion tube body 82 corresponding to the tube blank 7, so that the first flaring of the sealing tube body 83 and the insertion tube body 82 is completed.
In some embodiments of the present invention, as shown in fig. 5, both sides of the fourth connecting section are smoothly transited to one side of the two third connecting sections, respectively. Because the connection pipe body 81 and the insertion pipe body 82 are in smooth transition, the connection between the third connection section and the fourth connection section can be better matched with the connection between the connection pipe body 81 and the insertion pipe body 82; in addition, the forming process of the connecting tube 81 and the inserting tube 82 can be more convenient, and the resistance of the connecting tube 81 and the inserting tube 82 in the forming process is reduced. Specifically, the third connecting section and the fourth connecting section are in rounded transition.
The embodiment of the invention also provides a forming method for forming the single-clamp pressing pipe, which comprises the following steps:
s1, positioning of the tube blank 7: positioning the tube blank 7 in the first cavity 2 of the fixed die 1;
s2, mold closing: the movable die 3 descends until the end surface of the movable die 3 is attached to the end surface of the fixed die 1;
s3, exhaust: liquid medium enters the inner cavity of the tube blank 7 from the through hole 6 of the punch 5, the inner cavity of the tube blank 7 is filled with liquid, and 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 oppositely, and the two punches 5 enter the inner cavity of the tube blank 7; simultaneously, injecting a medium-pressure liquid medium with constant pressure and constant pulsation frequency into the inner cavity of the tube blank 7 until the high-pressure sealing sections 53 of the two punches 5 are abutted against the two sides of the tube blank 7, and at the moment, finishing flaring of the tube blank 7, establishing a medium-low pressure metal hard sealing surface and initial medium-pressure pre-expansion;
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, a 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 sealing surface so as to perform high-pressure bulging 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 pipe blank 7 is completely yielded 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 pipe blank 7 is shaped at high pressure;
s6, pressure relief: a liquid medium generator for injecting a liquid medium into the single-clamp pressure clamping pipe 8 releases the pressure, and a power oil cylinder for pushing the punch 5 to move releases the pressure;
s7, opening the mould: the movable die 3 moves upwards, and the molded single-clamp clamping pressure pipe 8 is taken out.
In step S4, injecting a medium-pressure liquid medium with constant pressure and constant pulsation frequency into the inner cavity of the tube blank 7, wherein the medium-pressure liquid medium provides a supporting force for the tube blank 7 to prevent the tube blank 7 from sinking inwards;
here, 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 step S5, experiments prove that the single-clamp pressure pipe 8 can realize high-pressure shaping under the action of a liquid medium with a pressure of 50Mpa to 60Mpa, thereby realizing medium-high pressure pulsation liquid-filling molding of the single-clamp pressure pipe 8.
In summary, the die for molding the single-clamp clamping pipe provided by the embodiment of the invention has the following advantages:
(1) a low-pressure metal hard sealing surface is formed between the low-pressure sealing section 52 of the punch 5 and the tube blank 7, and a high-pressure metal hard sealing surface is formed between the high-pressure sealing section 53 of the punch 5 and the tube blank 7, so that a liquid medium has a good sealing effect, and the single-clamp pressure pipe 8 can be formed by a water expansion forming technology, so that the formed single-clamp pressure pipe 8 has good quality;
(2) compared with the clamping pressure pipe needed in the prior art which is formed by ultrahigh pressure pulsation charging, the die provided by the embodiment of the invention is matched with a 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 single-clamping pressure pipe 8 in the forming process is ensured, the die has the advantages of multiple cavities in one die, the forming time of the single-clamping pressure pipe 8 can be shortened, and the working efficiency is improved;
(3) a plurality of working procedures are not needed, and the die can be formed at one time, so that the working efficiency is improved;
(4) the sealing surface adopts the metal hard sealing principle, so that the performance of the single-clamp pressure pipe 8 is more reliable, and the surface damage to the single-clamp pressure pipe 8 is reduced;
(5) the die provided by the embodiment of the invention 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 single-clamp clamping tube 8 meets the design requirement, and the fixed die 1 and the movable die 3 can ensure that the outer diameter of the single-clamp clamping tube 8 meets the design requirement, so that the size tolerance of the single-clamp clamping tube is controllable.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (7)
1. A mould for single calorie of card presses pipe shaping, it is suitable for pressing pipe with the pipe processing formation single calorie of card, single calorie of card presses pipe to have two sealed body that set up relatively, its characterized in that includes:
the fixed die is provided with at least one first cavity matched with the outer surface of the single-card clamping pipe, and two sides of the first cavity are opening 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 opening sides;
the two punches are respectively connected to two opposite sides of the fixed die and the movable die in a sliding mode, one punch is provided with a through hole allowing a liquid medium to flow, the contour edge of the punch is provided with an expanding section and a high-pressure sealing section, and the expanding section is used for expanding the inner diameter of the tube blank;
the fixed die and the movable die both 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, and the side of the second connecting section connected with the first connecting section is a first side; when first die cavity with the cooperation of second die cavity is used for in the time of the fashioned die cavity of single calorie of card pressure tube, the cover half first linkage segment with the movable mould the interval between the first linkage segment with the external diameter of high-pressure seal section equals, the first side of cover half with the interval between the first side of movable mould is greater than the internal diameter in the sealed body outside.
2. The mold for molding the single-clamping pressure pipe according to claim 1, wherein the single-clamping pressure pipe further comprises a connecting pipe body and two inserting pipe bodies, two sides of the inserting pipe bodies are respectively connected with one side of the connecting pipe body and the sealing pipe body, the fixed mold and the movable mold each further comprise two third connecting sections and four connecting sections, and the second connecting sections, the third connecting sections and the fourth connecting sections respectively correspond to the sealing pipe body, the inserting pipe body and the connecting pipe body;
the second connecting section further comprises a second side opposite to the first side, two sides of the fourth connecting section are respectively connected with one side of the two third connecting sections, and the other side of each third connecting section is connected with the second side of the second connecting section.
3. The die for single-chuck pipe pressing according to claim 2, wherein the flaring section is obliquely arranged, the minimum diameter of the flaring section is smaller than the diameter of the pipe blank, and the maximum diameter of the flaring section is larger than the diameter of the pipe blank.
4. The die for single-seized pipe forming according to claim 3, wherein the contour edge of the punch further includes a low-pressure seal section, the flared section, the low-pressure seal section and the high-pressure seal section are sequentially connected end to end, the flared section is connected to one side of the low-pressure seal section, the flared section extends obliquely outward toward the low-pressure seal section, and the diameter of the flared section gradually increases in a direction approaching the low-pressure seal section;
and the gap between the low-pressure sealing section and the third connecting section is larger than the thickness of the tube blank.
5. The die for single-caliper tube forming according to claim 4, wherein the sum of the lengths of the flared section and the low-pressure seal section in the axial direction of the punch is equal to the sum of the lengths of the second connecting section and the third connecting section in the axial direction of the punch.
6. The mold for single-clamp pipe pressing according to claim 2, wherein two sides of the fourth connecting section are in smooth transition with one side of each of the two third connecting sections.
7. The mold for single-card pipe crimping according to claim 6, wherein the third connecting section and the fourth connecting section are rounded off.
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| CN202010735129.2A CN111774468B (en) | 2020-07-27 | 2020-07-27 | Be used for Shan Kaka press pipe fashioned mould |
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| US5353618A (en) * | 1989-08-24 | 1994-10-11 | Armco Steel Company, L.P. | Apparatus and method for forming a tubular frame member |
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| CN111774468B (en) | 2024-05-10 |
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