CN112108555A - Clamping and pressing pipe forming method through clamping and pressing pipe equipment - Google Patents
Clamping and pressing pipe forming method through clamping and pressing pipe equipment Download PDFInfo
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- CN112108555A CN112108555A CN202010734697.0A CN202010734697A CN112108555A CN 112108555 A CN112108555 A CN 112108555A CN 202010734697 A CN202010734697 A CN 202010734697A CN 112108555 A CN112108555 A CN 112108555A
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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
- 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
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
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- Mechanical Engineering (AREA)
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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 clamp-press pipe forming, and discloses a clamp-press pipe forming method through clamp-press pipe forming equipment, which comprises the following steps: s1, positioning the tube blank; s2, closing the fixed die and the movable die; s3, exhausting; s4, flaring and initial medium-pressure pre-expansion; s5, medium-pressure high-pressure expansion and high-pressure shaping; s6, pressure relief; and S7, opening the mould. The invention can achieve the purpose of processing the pipe blank into a single-clamping pressure pipe, a double-clamping pressure pipe, a multi-cavity single mould and a small forming pressure of a counter-clamping pressure pipe.
Description
Technical Field
The invention relates to the technical field of pipe clamping and pressing forming methods, in particular to a pipe clamping and pressing forming method through pipe clamping and pressing equipment.
Background
At present, the clamping and pressing pipe is mainly divided into a single-clamping and pressing pipe and a double-clamping and pressing pipe, wherein the forming of the single-clamping and pressing pipe is mainly realized in a mechanical forming mode, equipment required by the forming is mainly provided with a pipe end forming machine and a cold heading machine, and 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 clamping pipe mainly comprises primary flaring, secondary flaring, pipe end heading ring and shaping, wherein when the single-clamp clamping pipe is processed in a single-head processing mode, the quality of the formed single-clamp clamping pipe is stable, but the forming process of the single-clamp clamping pipe needs eight times; when the processing mode of the single-clamp clamping pipe is double-end processing, the forming efficiency of the single-clamp clamping pipe is high, but the quality of the single-clamp clamping pipe is unstable.
The shaping of two calories of joint pipes is mainly realized with the fashioned mode of water inflation, the production process of two calories of joint pipes does, behind hydraulic pressure die-locking cylinder to cover half and movable mould mode locking, the power cylinder that is located cover half and movable mould both sides drives the inner chamber that the drift inserted the pipe, simultaneously with the cooperation of outer mold cavity, make the pipe wall produce the magnitude of interference, form a seal chamber, pour into the superhigh pressure medium into by superhigh pressure generating device in to seal chamber at last, simultaneously, two drifts do the opposite directions motion, so that two calories of joint pipes can the shaping. However, the technique of processing a pipe blank by an ultrahigh-pressure liquid medium has the following disadvantages: (1) the high-pressure sealing surface is formed by interference fit of a punch head and the inner wall of a tube blank, the outer wall of the tube blank and the inner wall of a die cavity, and in the process of forming the double-clamping pressing tube, the material of the tube blank can simultaneously bear tensile stress and compressive stress, so that the tube blank is easily damaged, and the tube blank is scrapped; (2) because the tube blank is easy to burst, when the die is set to be in a multi-cavity mode, other tube blanks can not be formed due to pressure loss, and therefore waste of the tube blank is caused; (3) because the molding pressure is high, the required mold locking force is high, the structure of the molding equipment is complex, and the cost is high.
Disclosure of Invention
The purpose of the invention is: the invention provides a clamping and pressing pipe forming method through clamping and pressing pipe equipment, which aims to achieve the purpose of simultaneously processing a pipe blank into a single clamping and pressing pipe, a double clamping and pressing pipe, a die with multiple cavities and small forming pressure for the clamping and pressing pipe.
In order to achieve the purpose, the invention provides a clamping and pressing pipe forming method through clamping and pressing pipe equipment, wherein the clamping and pressing pipe is provided with a sealing pipe body, the clamping and pressing pipe equipment comprises a fixed die, and the fixed die is provided with at least one first cavity matched with the appearance of the clamping and pressing pipe; the movable die is movable relative to the top of the fixed die and provided with a second cavity, the movable die and the fixed die are both provided with connecting sections matched with the sealing tube body, and the first cavity and the second cavity are matched to form a die cavity for forming the clamping and pressing tube; the punch heads are arranged in pairs, the two punch heads move oppositely in the die cavity, one punch head is provided with a through hole, and the contour 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; a first power assembly for propelling the punch within the die cavity; the power output end of the second power assembly is communicated with the through hole of the punch, and the first power assembly is used for providing the liquid medium; a control device electrically connected to the first power assembly and the second power assembly, comprising:
s1, positioning the tube blank: positioning the tube blank in a second cavity of the fixed die;
and S2, closing the fixed die and the movable die: the movable die descends until the lower end surface of the movable die is in contact with the upper end surface of the fixed die, and the die cavity is in a pressure maintaining state;
s3, exhaust: the second power assembly injects a liquid medium into the inner cavity of the tube blank through the through hole of the punch and simultaneously exhausts gas in the tube blank;
s4, flaring and initial medium-pressure pre-expansion: the two punches move towards the direction close to each other and enter the inner cavity of the tube blank, and the flaring section flares the tube blank part; simultaneously, the second power assembly injects a medium-pressure liquid medium into the inner cavity of the tube blank through the through hole of the punch until two ends of the tube blank abut against the two high-pressure sealing sections, the inner wall of the tube blank after flaring abuts against the low-pressure sealing section, and a gap is reserved between the inner wall of the tube blank after flaring and the peripheral walls of the first cavity and the second cavity;
s5, medium-pressure high-pressure expansion and high-pressure shaping: the two punches move towards the direction of approaching each other, meanwhile, the second power assembly injects a liquid medium from medium pressure to high pressure into the inner cavity of the tube blank through the through holes of the punches until the high-pressure sealing section abuts against the outer side of the connecting section, and a gap is formed between the inner wall of the tube blank subjected to medium-pressure and high-pressure pre-expansion forming and the low-pressure sealing section; then, the first power assembly and the second power assembly are both in a pressure maintaining state, and the second power assembly injects a high-pressure liquid medium into the inner cavity of the tube blank through the through hole of the punch until the outer wall of 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;
s6, pressure relief: the first power assembly is used for releasing pressure, and the second power assembly is used for releasing pressure;
s7, opening the mould: and the movable die moves upwards to take out the molded clamping pipe.
In some embodiments of the present application, in the step S4, the liquid medium has a constant pressure and a constant pulsation frequency.
In some embodiments of the present application, in the step S5, the liquid medium has a constant pulsation frequency.
In some embodiments of the present application, when the clamping pipe is a single-clamping pipe, the cross section of the high-pressure sealing section is circular, and in the step S5, when the outer wall of the high-pressure sealing section is moved to extend to the outside of the connection section of the fixed mold and the outside of the connection section of the movable mold, the single-clamping pipe performs medium-pressure high-pressure bulging.
In some embodiments of the present application, when the clamping pipe is a double-clamping pipe, the high-pressure sealing section includes a first high-pressure sealing section and a second high-pressure sealing section that are sequentially disposed toward the flared portion, the first high-pressure sealing section is connected to the low-pressure sealing section, the second high-pressure sealing section is adapted to the connecting section, and an accommodating cavity for accommodating the pipe blank portion is provided between the first high-pressure sealing section and the low-pressure sealing section;
in the step S4, when the punch moves to the two ends of the tube blank to be connected with the first high-pressure sealing section, the double-clamp pressure tube completes the initial intermediate-pressure pre-expansion.
In some embodiments of the present application, in step S5, when the end face where the maximum outer diameter of the second high-pressure sealing section is located moves to extend to the outside of the connection section of the fixed mold and the outside of the connection section of the movable mold, the double-clamping pressure pipe completes medium-high pressure expansion.
Compared with the prior art, the clamping and pressing pipe forming method through the clamping and pressing pipe equipment has the beneficial effects that:
in the method for forming a clamped-pressure pipe by using the clamped-pressure pipe equipment, in step S3, air in the pipe blank is exhausted, so that a vacuum environment is formed in the process of forming the clamped-pressure pipe;
in step S4, after the pipe blank is flared and initially pre-expanded at medium pressure, two ends of the pipe blank abut against the two high-pressure sealing sections, so that a medium-low pressure metal hard sealing surface is formed between the inner wall of the pipe blank subjected to flaring and the two low-pressure sealing sections; in addition, the position where the punch abuts against the pipe blank in the high-pressure sealing section is defined as a first forming position, the first forming position has important significance on the forming quality of the clamping pipe, if the punch cannot be positioned at the first forming position in the step S4, in the next step S5, a waste defective product is generated or subsequent treatment is required, so that the forming quality of the clamping pipe is better;
in the step S5, a high-pressure metal hard sealing surface is formed between the high-pressure sealing section and the tube blank, two ends of the tube blank are respectively abutted against the two high-pressure sealing sections, and the outer wall of the tube blank close to the port is attached to the high-pressure sealing section, so that the single-clamp pressure tube and the single-clamp pressure tube can be manufactured by water expansion molding; in addition, the tube blank can be molded under the action of medium-high pressure liquid medium, so that the molding time of the clamping and pressing tube, the mold locking force of the clamping and pressing tube molding equipment and the cost of the clamping and pressing tube molding equipment are reduced.
Drawings
Fig. 1 is a schematic structural view of a pipe clamping and pressing molding apparatus according to an embodiment of the present invention.
Fig. 2 is an exploded view of a pipe clamp-pressing molding apparatus 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 diagram of a moving die, a fixed die and a punch for processing a single-card crimp tube according to an embodiment of the present invention.
Fig. 6 is an exploded view of fig. 5.
Fig. 7 is a schematic structural diagram of a punch for processing a single-card crimp tube according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a pipe clamping and pressing forming apparatus according to an embodiment of the present invention, when a single-clamp pipe clamping is processed, and in step S4 of the forming method.
Fig. 9 is a schematic view of the structure of fig. 7 at a.
Fig. 10 is a schematic structural diagram of a pipe clamping and pressing forming apparatus according to an embodiment of the present invention, when a single-clamp pipe clamping is processed, and in step S5 of the forming method.
Fig. 11 is a schematic view of the structure of fig. 10 at B.
FIG. 12 is a schematic view of the structure of the molded single-card crimp tube.
FIG. 13 is a schematic structural diagram of a moving die, a fixed die and a punch for machining a double-clamping-pressure pipe according to an embodiment of the invention.
Fig. 14 is an exploded view of fig. 13.
Fig. 15 is a schematic structural diagram of a punch for machining a double-clamp pipe according to an embodiment of the invention.
Fig. 16 is a schematic structural diagram of a clamp-pressing pipe forming apparatus according to an embodiment of the present invention, when a double-clamp pipe is processed, and at step S4 of the forming method.
Fig. 17 is a schematic view of the structure of fig. 16 at C.
Fig. 18 is a schematic structural diagram of a pipe clamping and pressing forming apparatus according to an embodiment of the present invention, when a single-clamp pipe clamping is processed, and in step S5 of the forming method.
Fig. 19 is a schematic view of the structure of fig. 18 at D.
FIG. 20 is a schematic view of the structure of the molded double-card crimp tube.
In the figure, 1, a frame; 2. fixing a mold; 21. a first connection section; 22. a second connection section; 221. A first side; 222. a second side; 3. a first cavity; 4. moving the mold; 41. a first connection section; 42. a second connection section; 421. a first side; 422. a second side; 5. a second cavity; 6. an accommodating chamber; 7. a punch; 71. perforating; 72. a flared section; 73. a low pressure seal section; 74. a high pressure seal section; 741. a first high pressure seal section; 742. a second high pressure seal section; 8. a first power assembly; 81. a first servomotor; 82. a first gear pump; 83. a first hydraulic pump; 84. A flow sensor; 9. a second power assembly; 91. a second servo motor; 92. a second gear pump; 93. a liquid medium generator; 10. a second hydraulic cylinder; 11. a control device; 12. a pipe blank; 13. a single-card pipe clamping; 131. sealing the tube body; 14. double-clamp pipe clamping; 141. sealing the tube body; 142. a pipe body is inserted.
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 20, a preferred embodiment of the present invention provides a pressure pipe forming apparatus, which is adapted to process a blank pipe into a pressure pipe, and includes: a frame 1; the fixed die 2 is fixed on the rack 1, the fixed die 2 is provided with at least one first cavity 3 matched with the outer surface of the clamping pipe, and two sides of the first cavity 3 are opening sides; the movable die 4 is connected to the rack 1 in a sliding mode, the movable die 4 is located on the upper portion of the fixed die 2, the movable die 4 is provided with a second cavity 5 matched with the first cavity 3, two sides of the second cavity 5 are opening sides, and the first cavity 3 is matched with the second cavity 5 to form a die cavity for clamping and pressing pipe forming; the punching heads 7 are arranged in pairs, the two punching heads 7 move oppositely in the die cavity, one punching head 7 is provided with a through hole 71, and the outline edge of the punching head 7 is provided with a flaring section 72, a low-pressure sealing section 73 and a high-pressure sealing section 74 which are arranged in sequence from the end; a first power assembly 8 for pushing the punch 7 to move in the die cavity; a second power assembly 9, the power output end of which is communicated with the through hole 71 of the punch 7, and a first power assembly 8 is used for providing a liquid medium; wherein the punch 7 has a first forming position and a second forming position, when the punch 7 is at the first forming position, the low-pressure sealing section 73 is connected with part of the inner wall of the tube blank 12 to form a low-pressure metal hard sealing surface, and a gap is reserved between part of the outer wall of the tube blank 12 and the first cavity 3 and the second cavity 5; when the punch 7 is in the second forming position, the high-pressure seal section 74 is connected to a portion of the outer wall of the tube blank 12 to form a high-pressure metal hard seal surface, and a gap is provided between a portion of the inner wall of the tube blank 12 and the low-pressure seal section 73.
Based on the above arrangement, by arranging the flaring section 72, the flaring section 72 flares the pipe blank 12, and in the process of flaring the pipe blank 12 by the flaring section 72, the inner wall of the pipe blank 12 subjected to flaring abuts against the outer periphery of the punch 7, and a gap is formed between the outer wall of the pipe blank 12 subjected to flaring and the peripheral wall of the first cavity 3 and the peripheral wall of the second cavity 5, so that a medium-low pressure metal hard sealing surface is formed between the inner wall of the pipe blank 12 subjected to flaring and the periphery of the punch 7, and simultaneously, a medium-pressure liquid medium with constant pressure and constant pulsation frequency enters a sealed cavity enclosed by the medium-low pressure metal hard sealing surface through the through hole 71 of the pipe blank 12, and finally, when the punch 7 is located at the first forming position, two ends of the pipe blank respectively abut against the two ultrahigh pressure sealing sections 74, so as to realize initial medium-pressure pre-bulging of the;
after the pipe blank 12 is subjected to initial medium-pressure pre-expansion, liquid medium with constant pulse frequency from medium pressure to high pressure is continuously injected into the pipe blank 12, the liquid medium forms a soft male die, the inner wall of the pipe blank 12 and a high-pressure sealing section 74 of the punch 7 form a high-pressure metal hard sealing surface, and meanwhile, the two punches 7 move oppositely under the combined action of the soft male die and the punch 7, so that medium-pressure and high-pressure expansion of the pipe blank 12 is realized; when the high-pressure sealing section 74 of the punch 7 moves to the second forming position, the liquid medium is in a pressure maintaining state, the liquid medium performs high-pressure shaping on the tube blank 12, and the tube blank 12 completely yields to the peripheral wall of the first cavity 3, the peripheral wall of the second cavity 5 and the peripheral wall of the high-pressure sealing section 74, so that the high-pressure shaping of the tube blank 12 is realized;
therefore, the clamping and pressing pipe forming equipment provided by the embodiment of the invention has the following advantages:
(1) the pressure sealing section is connected with part of the inner wall of the tube blank 12 to form a low-pressure metal hard sealing surface, a high-pressure metal hard sealing surface is formed between the high-pressure sealing section 74 and the tube blank 12, and two ends of the tube blank are respectively abutted against the two high-pressure sealing sections 74, so that the single-clamp pressure tube 13 can be manufactured through water expansion molding;
(2) when the tube blank 12 is in the initial medium-pressure pre-expansion stage, the low-pressure sealing section 73 is connected with part of the inner wall of the tube blank 12 to form a low-pressure metal hard sealing surface, and a gap is reserved between the outer wall of the flared tube blank 12 and the peripheral walls of the first cavity 3 and the second cavity 5; when the tube blank 12 is in the high-pressure bulging and high-pressure shaping stages, a high-pressure metal hard sealing surface is formed between the high-pressure sealing section 74 and the tube blank 12, and a gap is formed between the outer wall of the tube blank 12 subjected to the high-pressure bulging and high-pressure shaping and the low-pressure sealing section 73, so that in the forming process, the tube blank 12 can float in a die cavity, and the tube blank 12 is only under the action of pressure stress and cannot be under the action of tensile stress, so that the damage to the tube blank 12 and the punch 7 is reduced, and the purpose of one die with multiple cavities can be realized;
(3) the tube blank 12 can be molded under the action of medium-high pressure liquid medium, so that the molding time of the clamping and pressing tube, the mold locking force of the clamping and pressing tube molding equipment and the cost of the clamping and pressing tube molding equipment are reduced;
(4) the single-card clamping pipe 13 and the double-card clamping pipe 14 are formed in one step without a plurality of working procedures, so that the working efficiency is improved;
(5) the sealing surface adopts the metal hard sealing principle, so that the performance of the double-clamping pressure pipe 14 is more reliable, and the surface damage to the single-clamping pressure pipe 13 is reduced;
(6) the size of the outer contour of the punch 7 can ensure that the inner diameter of the clamping and pressing pipe meets the design requirement, and the fixed die 2 and the movable die 4 can ensure that the outer diameter of the clamping and pressing pipe meets the design requirement, so that the size tolerance of the double-clamping and pressing pipe is controllable.
In some embodiments, optionally, as shown in fig. 5 to 20, the clamping and pressing pipe has a sealing pipe body, the fixed die 2 and the movable die 4 each include a first connecting section and a second connecting section arranged in sequence from outside to inside, the second connecting section has a first side and a second side arranged oppositely, the first side and the second side are arranged in sequence close to the central axis of the die cavity, the first side is integrally connected with the first connecting section, and the second connecting section corresponds to a part of the sealing pipe body; wherein, the fixed mold 2 comprises a first connecting section 21 and a second connecting section 22, the second connecting section 22 comprises a first side 221 and a second side 222, the movable mold 4 comprises a first connecting section 41 and a second connecting section 42, the second connecting section 42 comprises a first side 421 and a second side 422, and when the first cavity 3 and the second cavity 5 are matched to form a mold cavity for the pressure pipe molding, the maximum outer diameter of the high-pressure sealing section 74 is equal to the interval between the two first connecting sections. Therefore, the plane where the maximum outer diameter of the high-pressure sealing section 74 is located is close to the first side, when the plane where the maximum outer diameter of the high-pressure sealing section 74 is located is connected with the second connecting section, the punch 7 is located at the second forming position, at the moment, two ends of the tube blank 12 are respectively abutted to the high-pressure sealing section 74, the first power assembly 8 is in a pressure maintaining state, the second power assembly 9 provides a high-pressure liquid medium and is in the pressure maintaining state, and therefore the outer wall of the tube blank 12 can be conveniently attached to the peripheral wall of the first cavity 3, the peripheral wall of the second cavity 5 and the peripheral wall of the high-pressure sealing section 74.
In some embodiments, optionally, as shown in fig. 7, in order to make the punch 7 better adapt to the shape of the single-seized pressure pipe 13, when the single-seized pressure pipe 13 is the single-seized pressure pipe 13, the single-seized pressure pipe 13 has a sealing pipe body 131, and the cross section of the high-pressure sealing section 74 is circular. Therefore, when the high-pressure seal is connected with the second connecting section, the punch 7 is in the second forming position, at this time, two ends of the tube blank 12 respectively abut against the high-pressure seal section 74, the first power assembly 8 is in the pressure maintaining state, the second power assembly 9 provides the high-pressure liquid medium and is in the pressure maintaining state, and under the action of the high-pressure liquid medium, the outer wall of the tube blank 12 abuts against the peripheral wall of the first cavity 3, the peripheral wall of the second cavity 5 and the peripheral wall of the high-pressure seal section 74.
In some embodiments, optionally, as shown in fig. 13 to 19, in order to make the punch 7 better adapt to the shape of the double-clamping pressing pipe 14, when the double-clamping pressing pipe 14 is a double-clamping pressing pipe 14, the double-clamping pressing pipe 14 further includes a plug pipe body 142 connected with the sealing pipe body 141;
the high-pressure sealing section 74 comprises a first high-pressure sealing section 741 and a second high-pressure sealing section 742 which are sequentially arranged close to the flared part, the first high-pressure sealing section 741 is connected with the low-pressure sealing section 73, and the second high-pressure sealing section 742 is matched with the first connecting section;
wherein, the first high-pressure sealing section 741 and the low-pressure sealing section 73 have a containing cavity 7 for containing a part of the pipe blank 12 therebetween. Therefore, when the high-pressure seal is connected with the second connecting section, the punch 7 is located at the second forming position, at the moment, the pipe section of the pipe blank 12 corresponding to the plug-in pipe body is accommodated in the accommodating cavity 7 and has a gap with the low-pressure sealing section 73, the pipe section of the pipe blank 12 corresponding to the sealing pipe body and the low-pressure sealing section 73 have a gap, the first power assembly 8 is in a pressure maintaining state, the second power assembly 9 provides a high-pressure liquid medium and is in the pressure maintaining state, and under the action of the high-pressure liquid medium, the outer wall of the pipe blank 12 is attached to the peripheral wall of the first cavity 3, the peripheral wall of the second cavity 5 and the peripheral wall of the high-pressure sealing.
In some embodiments, optionally, as shown in FIGS. 5-20, the flared section 72 is disposed at an angle, the minimum diameter of the flared section 72 being less than the diameter of the tube blank 12, and the maximum diameter of the flared section 72 being greater than the diameter of the tube blank 12. Thus, the diameter of the flared section 72 is partially smaller than the diameter of the tube blank 12, thereby facilitating entry of the punch 7 into the inner cavity of the tube blank 12; the diameter of the flared section 72 is partially greater than the diameter of the tube blank 12, thereby facilitating flaring of the tube blank 12; further, the flared section 72 is inclined upward toward the low-pressure seal section 73, thereby facilitating flaring of the tube blank 12 along the outer wall of the flared section 72.
In some embodiments, optionally, as shown in fig. 3 and 4, in order to improve the forming efficiency of the tube blank 12, the number of the first cavities 3 is set to 2-10, and the number of the second cavities 5 is set to 2-10, and the user can set the number of the first cavities 3 and the second cavities 5 as needed.
In some embodiments, optionally, as shown in fig. 1 and 2, in order to enable positioning of the punch 7 in the first forming position and in the second forming position, the first power assembly 8 comprises: the input end of the first servo driver is electrically connected with the control device 11; the input end and the rotating speed output end of the first servo motor 81 are respectively connected with the output end and the rotating speed feedback end of the first servo driver; the input end of the first gear pump 82 is connected with the output end of the first servo motor 81, and the first gear pump 82 is provided with an oil inlet connected with an oil tank; the number of the first hydraulic cylinders 83 is two, the input ends of the first hydraulic cylinders 83 are connected with the output end of the first gear pump 82, and the output end of the first hydraulic cylinder 83 is connected with all the punches 7 positioned on one side of the die cavity through a connecting plate; the input end and the output end of the first pressure sensor are respectively and electrically connected with the first hydraulic cylinder 83 and the control device 11; the displacement output end of the first hydraulic cylinder 83 is connected with the input end of the displacement sensor, and the output end of the displacement sensor is electrically connected with the control device 11; the flow sensor 84, and the input and output of the flow sensor 84 are electrically connected to the first hydraulic cylinder 83 and the control device 11, respectively. Because the punch 7 in the prior art is positioned by matching a proportional valve driving system with a displacement sensor, the punch 7 cannot be positioned at a preset position after being positioned for multiple times, thereby generating waste and defective products or needing subsequent treatment, and further being inconvenient to improve the production efficiency; the first pressure sensor of the embodiment of the present invention receives the pressure of the hydraulic oil flowing through the first hydraulic cylinder 83 and feeds back the data to the control device 11, and the control device 11 compares the pressure of the hydraulic oil flowing through the first hydraulic cylinder 83 with a preset pressure; the displacement sensor receives displacement data output by the piston rod of the first hydraulic cylinder 83 and feeds the data back to the control device 11, and the control device 11 compares the displacement data output by the piston rod of the first hydraulic cylinder 83 with preset displacement data; the flow sensor 84 receives the flow rate of the hydraulic oil flowing through the first hydraulic cylinder 83 and feeds the data back to the control device 11, and the control device 11 compares the flow rate of the hydraulic oil flowing through the first hydraulic cylinder 83 with a preset flow rate;
therefore, the control device 11 tracks and controls signals of the displacement sensor, the flow sensor 84, the first pressure sensor and the first servo driver, so that the punch 7 can be positioned at the first forming position and the second forming position, and the accuracy of repeated positioning of the punch 7 is improved; through testing, the accumulative error of the positioning of the punch 7 is less than or equal to +/-0.05 mm.
In some embodiments, optionally, as shown in fig. 1 and 2, the second power assembly 9 comprises:
the input end of the second servo driver is electrically connected with the control device 11;
the input end and the rotating speed output end of the second servo motor 91 are respectively connected with the output end and the rotating speed feedback end of the second servo driver;
the input end of the second gear pump 92 is connected with the output end of the second servo motor 91, and the second gear pump 92 is provided with an oil inlet communicated with the liquid medium storage tank;
the liquid medium generator 93 is characterized in that the input end of the liquid medium generator 93 is connected with the output end of the second gear pump 92, the liquid medium generator 93 is provided with a plurality of output ends which correspond to the punches 7 one by one, and the output ends of the liquid medium generator 93 are communicated with the through holes 71 of the punches 7 corresponding to the output ends;
a second pressure sensor, the input and output of which are electrically connected to the liquid medium generator 93 and the control device 11. Therefore, the liquid medium generator 93 can provide impulse pressure of 0-60 Mpa, which is not only beneficial to the initial yielding of the tube blank 12 and the integral shaping after the forming, but also convenient for the pressure compensation after the abrasion clearance of the die punch 7 is increased;
the second pressure sensor receives the pressure of the hydraulic oil flowing through the liquid medium generator 93 and feeds the data back to the control device 11, and the control device 11 compares the pressure of the hydraulic oil flowing through the liquid medium generator 93 with a preset pressure, so that the liquid medium generator 93 provides a medium-pressure liquid medium in an initial medium-pressure pre-expansion stage; in the medium-high pressure expansion stage, the liquid medium generator 93 provides the liquid medium from medium pressure to high pressure; in the high pressure shaping stage, the liquid medium generator 93 supplies the liquid medium at high pressure.
In some embodiments, optionally, as shown in fig. 1 and 2, in order to facilitate the moving mold 4 to move up and down relative to the fixed mold 2, the pipe clamping and pressing molding apparatus of the embodiment of the present invention further includes a second hydraulic cylinder 10 for driving the moving mold 4 to move up and down, the second hydraulic cylinder 10 is fixed to the frame 1, and an output end of the second hydraulic cylinder 10 is connected to the moving mold 4.
In some embodiments, optionally, as shown in fig. 1 and 2, the control device 11 is a PLC.
As shown in fig. 8, 9, 10, 11, 16, 17, 18 and 19, an embodiment of the present invention further provides a pipe clamping and pressing forming method by a pipe clamping and pressing apparatus, which includes the steps of:
s1, positioning the tube blank 12: positioning the tube blank 12 in the second cavity 5 of the fixed die 2;
and S2, closing the fixed die 2 and the movable die 4: the movable die 4 descends until the lower end surface of the movable die 4 is contacted with the upper end surface of the fixed die 2, and the die cavity is in a pressure maintaining state;
s3, exhaust: the second power assembly 9 injects liquid medium into the cavity of the tube blank 12 through the through hole 71 of the punch 7 and simultaneously exhausts the gas in the tube blank 12;
s4, flaring and initial medium-pressure pre-expansion: the two punches 7 move towards the direction close to each other and enter the inner cavity of the tube blank 12, and the flaring sections 72 flare the tube blank 12; meanwhile, the second power assembly 9 injects a medium-pressure liquid medium into the inner cavity of the tube blank 12 through the through hole 71 of the punch 7 until two ends of the tube blank 12 abut against the two high-pressure sealing sections 74, the inner wall of the flared tube blank 12 abuts against the low-pressure sealing section 73, and a gap is formed between the inner wall of the flared tube blank 12 and the peripheral walls of the first cavity 3 and the second cavity 5;
s5, medium-pressure high-pressure expansion and high-pressure shaping: the two punches 7 move towards the direction of approaching each other, and simultaneously, the second power assembly 9 injects a liquid medium from medium pressure to high pressure into the inner cavity of the tube blank 12 through the through holes 71 of the punches 7 until the high-pressure sealing section 74 abuts against the first side of the second connecting section, and a gap is formed between the inner wall of the tube blank 12 which is pre-expanded and formed through medium pressure and high pressure and the low-pressure sealing section 73; then, the first power assembly 8 and the second power assembly 9 are both in a pressure maintaining state, and the second power assembly 9 injects a high-pressure liquid medium into the inner cavity of the tube blank 12 through the through hole 71 of the punch 7 until the outer wall of the tube blank 12 completely yields to the peripheral wall of the first cavity 3, the peripheral wall of the second cavity 5 and the peripheral wall of the high-pressure sealing section 74;
s6, pressure relief: the first power assembly 8 is decompressed, and the second power assembly 9 is decompressed;
s7, opening the mould: the movable die 4 moves upwards, and the formed clamping pressure pipe is taken out.
Based on the above arrangement, in step S3, the air in the tube blank 12 is exhausted so as to have a vacuum environment during the forming process of the clamping tube;
in step S4, after the pipe blank 12 is flared and initially pre-expanded at medium pressure, both ends of the pipe blank 12 abut against the two high-pressure seal sections 74, and therefore a medium-low pressure metal hard seal surface is formed between the inner wall of the flared pipe blank 12 and the two low-pressure seal sections 73; further, the position where the punch 7 abuts against the tube blank 12 in the high-pressure seal section 74 is defined as a first forming position, which is important for the forming quality of the pressure pipe, and if the punch 7 cannot be positioned at the first forming position in step S4, in the next step S5, a waste product is generated or a subsequent process is required, so that the forming quality of the pressure pipe is better;
in step S5, a high-pressure metal hard seal surface is formed between the high-pressure seal section 74 and the tube blank 12, and the two ends of the tube blank are respectively abutted against the two high-pressure seal sections 74, and the outer wall of the tube blank near the port is attached to the high-pressure seal sections 74, so that the single-clamp pressure tube 13 and the single-clamp pressure tube 13 can be both formed by water expansion molding; in addition, the tube blank 12 can be molded under the action of medium-high pressure liquid medium, so that the molding time of the clamping pipe, the mold locking force of the clamping pipe molding equipment and the cost of the clamping pipe molding equipment are reduced.
In step S4, the liquid medium has a constant pressure and a constant pulsation frequency, thereby ensuring that the tube blank 12 has a stable forming process; further, the pressure of the liquid medium in step S4 does not exceed the yield force of the tube blank 12. So that the tube blank 12 is not depressed toward the center during the flaring process.
In step S5, the liquid medium has a constant pulsation frequency, thereby ensuring that the tube blank 12 has a stable forming process.
In order to facilitate the positioning of the punch 7 at the first molding position, when the clamping pipe is the single-clamping pipe 13, the cross section of the high-pressure seal section 74 is circular, and in step S5, when the outer wall of the high-pressure seal section 74 is moved to be extended from the first side of the second connecting section of the fixed mold 2 and the first side of the second connecting section of the movable mold 4, the single-clamping pipe 13 completes the medium-pressure high-pressure expansion molding.
In order to facilitate the positioning of the punch 7 at the first forming position, when the clamping pipe is a double-clamping pipe 14, the high-pressure sealing section 74 comprises a first high-pressure sealing section 741 and a second high-pressure sealing section 742 which are sequentially arranged close to the flared part, the first high-pressure sealing section 741 is connected with the low-pressure sealing section 73, the second high-pressure sealing section 742 is matched with the connecting section, and an accommodating cavity 7 for accommodating a part of the tube blank 12 is arranged between the first high-pressure sealing section 741 and the low-pressure sealing section 73;
in step S4, when the punch 7 moves to connect the two ends of the tube blank 12 with the first high-pressure seal section 741, the double-seized pressure tube 14 completes the initial intermediate-pressure pre-expansion.
In order to facilitate positioning of the punch 7 at the second molding position, when the end surface at which the maximum outer diameter of the second high pressure sealing section 742 is located is moved to be extended to the first side of the second coupling section of the stationary mold 2 and the first side of the second coupling section of the movable mold 4 in step S5, the double seizing pipe 14 completes the medium-high pressure expansion.
In conclusion, the invention provides a clamping and pressing pipe forming method through clamping and pressing pipe equipment, so as to achieve the purposes of simultaneously processing a pipe blank into a single clamping and pressing pipe and a double clamping and pressing pipe, one die with multiple cavities and small forming pressure on the clamping and pressing pipe.
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.
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 (6)
1. A method for forming a clamping and pressing pipe through a clamping and pressing pipe device is disclosed, wherein the clamping and pressing pipe is provided with a sealing pipe body, the clamping and pressing pipe device comprises a fixed die, and the fixed die is provided with at least one first cavity matched with the appearance of the clamping and pressing pipe; the movable die is movable relative to the top of the fixed die and provided with a second cavity, the movable die and the fixed die are both provided with connecting sections matched with the sealing tube body, and the first cavity and the second cavity are matched to form a die cavity for forming the clamping and pressing tube; the punch heads are arranged in pairs, the two punch heads move oppositely in the die cavity, one punch head is provided with a through hole, and the contour 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; a first power assembly for propelling the punch within the die cavity; a second power assembly having a power output end in communication with the bore of the punch, the first power assembly for providing the liquid medium; a control device electrically connected to the first power assembly and the second power assembly, comprising:
s1, positioning the tube blank: positioning the tube blank in a second cavity of the fixed die;
and S2, closing the fixed die and the movable die: the movable die descends until the lower end surface of the movable die is in contact with the upper end surface of the fixed die, and the die cavity is in a pressure maintaining state;
s3, exhaust: the second power assembly injects a liquid medium into the inner cavity of the tube blank through the through hole of the punch and simultaneously exhausts gas in the tube blank;
s4, flaring and initial medium-pressure pre-expansion: the two punches move towards the direction close to each other and enter the inner cavity of the tube blank, and the flaring section flares the tube blank part; simultaneously, the second power assembly injects a medium-pressure liquid medium into the inner cavity of the tube blank through the through hole of the punch until two ends of the tube blank abut against the two high-pressure sealing sections, the inner wall of the tube blank after flaring abuts against the low-pressure sealing section, and a gap is reserved between the inner wall of the tube blank after flaring and the peripheral walls of the first cavity and the second cavity;
s5, medium-pressure high-pressure expansion and high-pressure shaping: the two punches move towards the direction of approaching each other, meanwhile, the second power assembly injects a liquid medium from medium pressure to high pressure into the inner cavity of the tube blank through the through holes of the punches until the high-pressure sealing section abuts against the outer side of the connecting section, and a gap is formed between the inner wall of the tube blank subjected to medium-pressure and high-pressure pre-expansion forming and the low-pressure sealing section; then, the first power assembly and the second power assembly are both in a pressure maintaining state, and the second power assembly injects a high-pressure liquid medium into the inner cavity of the tube blank through the through hole of the punch until the outer wall of 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;
s6, pressure relief: the first power assembly is used for releasing pressure, and the second power assembly is used for releasing pressure;
s7, opening the mould: and the movable die moves upwards to take out the molded clamping pipe.
2. The method of claim 1, wherein in the step S4, the liquid medium has a constant pressure and a constant pulsation frequency.
3. The method of claim 1, wherein in the step S5, the liquid medium has a constant pulsation frequency.
4. The pipe clamping and forming method by a pipe clamping apparatus according to claim 1, wherein when the pipe clamping is a single pipe clamping and pressing, the high pressure seal section has a circular cross-section, and in the step S5, when the outer wall of the high pressure seal section is moved to extend to the outside of the connection section with the fixed mold and the outside of the connection section with the movable mold, the single pipe clamping and pressing completes a medium pressure high pressure bulging.
5. The pipe clamping and pressing forming method by a pipe clamping and pressing device according to claim 1, wherein when the pipe clamping and pressing is a double-pipe clamping and pressing pipe, the high-pressure sealing section comprises a first high-pressure sealing section and a second high-pressure sealing section which are sequentially arranged close to the flared part, the first high-pressure sealing section is connected with the low-pressure sealing section, the second high-pressure sealing section is matched with the connecting section, and a containing cavity for containing the pipe blank part is arranged between the first high-pressure sealing section and the low-pressure sealing section;
in the step S4, when the punch moves to the two ends of the tube blank to be connected with the first high-pressure sealing section, the double-clamp pressure tube completes initial medium-pressure pre-expansion.
6. The pipe clamping and forming method by a pipe clamping apparatus according to claim 1, wherein in step S5, when the end surface where the maximum outer diameter of the second high-pressure seal section is located is moved to the extended position outside the connection section with the fixed mold and outside the connection section with the movable mold, the double-clamping pipe completes the medium-high pressure bulging.
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| CN112108555B CN112108555B (en) | 2022-04-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113441600A (en) * | 2021-07-20 | 2021-09-28 | 佛山市永恒液压机械有限公司 | Efficient elbow forming device and method |
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| US5239852A (en) * | 1989-08-24 | 1993-08-31 | Armco Steel Company, L.P. | Apparatus and method for forming a tubular frame member |
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| CN112108555B (en) | 2022-04-15 |
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