CN116274658A

CN116274658A - Stay wire shell processing die and method thereof

Info

Publication number: CN116274658A
Application number: CN202310231247.3A
Authority: CN
Inventors: 徐灿华
Original assignee: Zhejiang Aohuang Industry And Trade Co ltd
Current assignee: Zhejiang Aohuang Industry And Trade Co ltd
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-06-23

Abstract

The application relates to the field of machining of electric power engineering parts, and particularly discloses a stay wire shell machining die and a stay wire shell machining method. The stay wire shell produced by the scheme solves the defect brought by the existing stay wire shell product produced by adopting the casting steel piece process.

Description

Stay wire shell processing die and method thereof

Technical Field

The invention relates to the field of machining of parts in electric power engineering, in particular to a stay wire shell machining die and a stay wire shell machining method.

Background

The wedge-shaped wire clamp is mainly used for fixing wires to bear the tension of the wires and hanging the wires to hardware fittings on a tension string or a tower, and the wedge-shaped wire clamp is widely used on railways and high-speed railway gasification lines. In the prior art, the wedge-shaped strain clamp comprises a stay wire shell, a wedge-shaped cavity is formed in the stay wire shell, and a clamping block is inserted into the wedge-shaped cavity and used for clamping a wire to fix the wire. The wire is clamped between the clamping block and the inner wall of the wedge-shaped cavity, so that the effect of clamping the wire is achieved.

At present, the stay wire shell is produced and processed by casting steel parts, and the processing and production method has some insurmountable defects, such as air holes, cold insulation, shrinkage, stress concentration and the like, which are easy to generate, thereby reducing the use safety coefficient of the parts and increasing the hidden trouble of accidents. In view of this, enterprises consider that the stay wire shell is integrally machined by adopting a pressure machining mode, the whole round tube is prefabricated into a flat tube, then the flat tube is integrally formed into a middle blank, and the middle blank is shaped and cut to avoid the defects caused by a casting process, but the stay wire shell cannot be formed at one time by pressure machining, and multiple pressure machining combinations are needed, so that designing a corresponding die for multiple machining of the stay wire shell is one of the difficulties to be solved in the prior art.

Disclosure of Invention

The invention provides a stay wire shell processing die and a method thereof, which aim to solve the defects brought by the existing production of stay wire shell products by adopting a steel casting process.

In order to solve the above-mentioned purpose, the invention adopts the following technical scheme: a method for processing a stay wire shell,

step 1, preparing materials: blanking the round tube according to a specified length to form a flat tube;

step 2, shaping: the flat pipe is put into a water expansion die and is clamped and compacted up and down by a multi-directional hydraulic press;

step 3, primary water expansion: the water expansion flat pipe is extruded inwards by utilizing cylinders at two sides of the multidirectional hydraulic machine;

step 4, sawing: sawing off the flat tube after water expansion;

step 5, cutting: cutting the peripheral pattern of the flat tube by a laser cutting machine and cutting holes;

step 6, secondary shaping: the second die and the water expansion die are replaced, the upper die core rod is arranged on the opposite surfaces of the cylinders at the two sides, a multidirectional hydraulic press is started, and the upper die core rod at the two sides extrudes and reshapes a workpiece;

step 7, annealing: heating the workpiece to 500-550 ℃, preserving heat for 2-8 hours, and cooling to obtain a finished workpiece;

the water expansion die in the step 1 comprises a first upper die, a first lower die and a first core die, wherein spindle-shaped grooves capable of accommodating flat tubes are horizontally arranged in the first upper die and the first lower die, and a first channel communicated with an external liquid medium is formed in the first core die;

the second die in the step 2 comprises a second upper die, a second lower die and a second core die, wherein the second lower die is provided with a U-shaped groove with an upward opening, the middle line of the bottom of the U-shaped groove is upwards protruded, the second upper die is provided with a lug which can be inserted into the U-shaped groove in a fitting mode, the middle line of the bottom of the lug is in an inverted trapezoid shape, and the bottom surface of the lug is upwards sunken.

The basic principle of the scheme is as follows: the method comprises the steps of respectively fixing an upper die, a lower die and a core rod of a water expansion die on a longitudinal cylinder and a side cylinder of a multi-directional hydraulic machine, integrally processing a round pipe into a flat pipe, then putting the flat pipe into the water expansion die of the multi-directional hydraulic machine, closing the upper die and the lower die of the water expansion die, and when the core rod is extruded inwards, enabling a liquid medium to enter a hollow part of the flat pipe from a first channel, so that the flat pipe is water-expanded into a semi-finished workpiece and is attached to a groove of the water expansion die; and then placing the semi-finished workpiece after the pin holes are cut into a second die, closing the second die up and down, further compressing and shaping the external shape, extruding a second core die into the semi-finished workpiece along the inner wall of the semi-finished workpiece, shaping the inner wall of the semi-finished workpiece, and then annealing the finished workpiece to eliminate the internal stress.

The beneficial effect of this scheme is: the defects such as air holes, cold stops, shrinkage, internal stress and the like existing in the prior casting production process are overcome. The wire drawing shell produced by the method has no defects through detection flaw detection and tension test, the strength tension is far greater than 99 kilonewtons, various technical indexes are far higher than those of a steel casting product, the use safety coefficient is improved in a breakthrough way, and the use hidden danger is reduced.

Further, a detachable secondary mold core pressing ring is sleeved outside the second core mold. The travelling route of the core mould is further stabilized by the secondary mould core pressing ring.

Further, the step 2 is preceded by lubricating graphite powder on the inner surface of the water swelling mold. The lubricating property of the graphite powder is utilized to assist the demolding of the workpiece from the mold.

Further, the step 7 is preceded by chamfering and forming the openings at the two ends of the workpiece. The inner and outer edges of the two ends of the workpiece are smooth.

Further, the round tube in the step 1 is a Q355 seamless round tube. The Q355 material has the advantages of high strength, good comprehensive performance, long service life, wide application range, economy and the like.

Further, the step 3 is preceded by winding a waterproof film on the outer surface of the flat tube. Filling the gap between the flat pipe and the water expansion die, and avoiding the high-pressure liquid medium injected by water expansion from seeping out of the die closing gap.

Further, the liquid pressure for water expansion of the multi-directional hydraulic press in the step 3 is 20-30 Mpa. .

Drawings

FIG. 1 is a schematic view of an intermediate blank in an embodiment of the invention;

FIG. 2 is a schematic view of a blank to be shaped according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a finished wire housing.

FIG. 4 is a schematic view of a water expansion die according to an embodiment of the invention;

FIG. 5 is a front view of a water expansion die according to an embodiment of the invention;

FIG. 6 is a side view of a water expansion die in accordance with an embodiment of the invention;

FIG. 7 is a cross-sectional view of C-C in FIG. 6;

FIG. 8 is a schematic view of a primary shaping mold according to an embodiment of the present invention;

FIG. 9 is a schematic view of a portion of a primary shaping mold according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a second lower die of the primary shaping die according to an embodiment of the present invention;

FIG. 11 is a schematic view of a primary molding ring of a primary shaping mold in an embodiment of the present invention;

FIG. 12 is a schematic view of a secondary shaping mold according to an embodiment of the present invention;

FIG. 13 is a schematic front view of a secondary shaping mold according to an embodiment of the present invention;

FIG. 14 is a schematic view of a first reshaped workpiece after a first reshaping in an embodiment of the invention;

FIG. 15 is a schematic view of a secondary core clamping ring of a secondary shaping mold in an embodiment of the invention;

fig. 16 is a schematic view of a secondary mold core of a secondary shaping mold in an embodiment of the invention.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: a first upper die 1, a first lower die 2, a core rod 3, a first die groove 4, a second die groove 5, a thimble channel 6, a first groove 7, a second upper die 101, a first installation groove 1011, a second lower die 102, a second installation groove 1021, a first upper molding cavity 103, a first lower molding cavity 104, a first die core 105, a first tapered buffer head 106, a first limit table 107, a second limit table 108, a boss 1091, a second groove 1092, an intermediate blank 201, a first thimble hole 202, a first through groove 2031, a first inclined groove 2032, a first second through groove 2033, a first second inclined groove 2034, a third through groove 2035, a first fourth through groove 2036, a first third inclined groove 2037, a first fifth through groove 2038, a first fourth inclined groove 2039, a first sixth through groove 2030, a first through hole 204, a first installation hole 205, a first limit groove 206, a second through hole 203 the primary core press 207, the third upper die 301, the first step 3011, the second step 3012, the third step 3013, the third lower die 302, the secondary upper molding cavity 303, the secondary first through slot 3031, the secondary first diagonal slot 3032, the secondary second through slot 3033, the secondary second diagonal slot 3034, the secondary third through slot 3035, the secondary lower molding cavity 304, the secondary fourth slot 3041, the secondary third diagonal slot 3042, the secondary fourth diagonal slot 3043, the secondary fifth through slot 3044, the groove 305, the secondary core press 306, the secondary core 307, the large end 3071, the small end 3072, the secondary tapered buffer 308, the third stop 309, the secondary top pin 401, the lead angle 402, the blind hole 403, the secondary through hole 404, the secondary mounting hole 405, the secondary stop slot 406, the primary shaping work piece 501, the first side 5011, the second side 5012, the large end 5013, and the small end 5014..

An embodiment is substantially as shown in figures 1 to 16:

the method for manufacturing the stay wire shell comprises the following steps:

step 1, preparing materials: the round tube is processed into a flat tube according to the blanking of 105-110% of the volume of the two molded parts after molding, and a Q355 round tube with the length of 550mm is selected in the embodiment;

step 2, molding: the flat pipe is put into a spindle-shaped second groove die of a first lower die of a water expansion die, and is clamped up and down for compaction;

step 3, primary water expansion: smearing graphite powder in a water expansion die, winding and covering a waterproof film outside a flat pipe, putting the flat pipe into a second die groove 5 in a first lower die 2, sealing two ends of the flat pipe by a core rod 3 of the water expansion die, pressurizing a liquid medium into the flat pipe through a first channel of the core rod 3, and water expanding to form an intermediate blank, wherein the intermediate blank is shown in figure 1, and the pressurizing pressure of the liquid medium is 20-30 Mpa;

step 4, sawing: after the intermediate blank is taken out, sawing the center of the intermediate blank to obtain two blanks to be shaped;

step 5, cutting: cutting the side wall opening of the flat tube by a laser cutting machine and cutting holes to obtain a blank to be shaped, wherein the material volume of the blank is equal to that of the formed stay wire shell;

step 6, secondary shaping: performing primary shaping and secondary shaping on the blank to be shaped, wherein the secondary shaping is completed in a primary shaping die and a secondary shaping die respectively;

step 7, annealing: heating the workpiece to 500-550 ℃, preserving heat for 2-8 hours, and then naturally cooling in air to obtain the finished workpiece shown in figure 6.

Water expansion mould: as shown in fig. 4 to 7, the first upper die 1 and the first lower die 2 are rectangular, the opposite ends of the first upper die and the second lower die are respectively machined into a horizontal first die groove 4 and a horizontal second die groove 5, the first die groove 4 and the second die groove 5 are symmetrical, the shapes of the first die groove 4 and the second die groove 5 are spindle shapes, and after the first upper die and the second die are clamped, the first die groove 4 and the second die groove 5 form a cavity capable of being attached to the shape of the intermediate blank shown in fig. 5. A thimble channel 6 vertically penetrating through the first lower die 2 is formed in the center line of the second die cavity 5, the thimble channel 6 is used for accommodating an external thimble, and when the external thimble is put into the thimble channel from bottom to top, a stay wire shell in the first lower die is jacked and separated.

The two ends of the first die groove 4 and the second die groove 5 are combined to form an elliptic opening, and the opening is consistent with the shape of the flat pipe. The core rods 3 horizontally arranged at the two ends of the first upper die and the lower die are elliptical cylinders attached to the inner walls of openings at the two ends of the first upper die and the lower die, and the two core rods 3 are driven to translate in opposite directions along the horizontal direction through the hydraulic cylinder so as to be in contact with the two ends of the flat tube. The core rod 3 is horizontally provided with a first channel (not shown) penetrating the core rod, and the first channel is communicated with a liquid medium for external water expansion. The die is arranged on a multidirectional hydraulic press, the multidirectional hydraulic press adopts a YLST three-way hydraulic forming hydraulic press of a Wenzhou stand mechanical limited company, hydraulic cylinders are arranged at the top and the left and right sides of the multidirectional hydraulic press, the hydraulic cylinders at the top are lowered to drive a first upper die 1 to be closed with a first lower die 2, and then high-pressure water flow is injected into a cavity through a first channel, so that water expansion forming is carried out. A first groove 7 is arranged in parallel with the length direction of the first upper die 1 and the first lower die 2, and the first upper die and the first lower die are respectively fixed on the multi-directional hydraulic press through the first groove 7.

The water expansion die has the following using process: after the first upper die 1, the first lower die 2 and the core rod 3 are fixed on the multi-directional hydraulic machine, the flat pipe is placed in the second die cavity 5, the two ends of the die cavity are consistent with the shape of the flat pipe, the multi-directional hydraulic machine is started to press down the first upper die 1, so that the upper first lower die is closed, the core rods 3 on the left side and the right side are horizontally pushed into the two ends of the cavity to be abutted against the flat pipe, after a liquid medium is accessed into the cavity from the first channel, the two core rods 3 gradually move in opposite directions, and the middle part of the flat pipe under pressure expands and deforms and contacts with the first die cavity 4 and the second die cavity 5 to finish water expansion shaping. When the water-expanded workpiece is taken out, the upper die and the lower die are separated, and the outer thimble is inserted into the thimble channel 6 and jacks up the workpiece, so that the workpiece can be taken out.

Primary shaping die: as shown in fig. 8 to 11, the die comprises a second upper die 101 and a second lower die 102, a first installation groove 1011 for installing and positioning the second upper die 101 when installed on a multi-way hydraulic press is formed at the upper end of the second upper die 101, a first upper molding cavity 103 is formed at the lower end of the second upper die 101, the first upper molding cavity 103 comprises an upper side edge and a lower side edge, the upper side edge is composed of a first through groove 2031, a first inclined groove, a second through groove 2033, a second inclined groove 2034 and a third channel which are communicated in sequence, the lower side edge is composed of a fourth through groove 2036, a third inclined groove 2037, a fifth through groove 2038, a fourth inclined groove 2039 and a sixth through groove 2030 which are communicated in sequence, the first lower molding cavity 104 is matched with the first upper molding cavity 103 and has the same shape, when the second upper die 101 is buckled with the second lower die 102, the first upper molding cavity 103 and the first lower molding cavity 104 form a molding cavity in a closed state, and when the first upper molding cavity 103 and the second lower molding cavity 104 are buckled, the second molding cavity 201 and the second molding cavity 108 are arranged at the middle molding cavity 201 and the second molding cavity 108 are not arranged at the middle molding stage, the second molding cavity 201 is completed, the blank 201 is placed in the middle molding cavity 201 and the middle blank is finished, and the blank is not processed at the middle molding cavity 201; the molding cavity is symmetrical along the center line of the mold, so that the inclination angles of the primary first inclined groove 2032 and the primary second inclined groove 2034 on the upper side are consistent, the inclination angle can be set to be 10 degrees to 12 degrees according to the requirement of the final product, the inclination angle of the primary third inclined groove 2037 and the primary fourth inclined groove 2039 on the lower side are consistent, and the inclination angle can be set to be 40 degrees to 47 degrees according to the requirement of the final product; simultaneously, the four corners at the lower end of the second upper die 101 are integrally formed with the protruding blocks, the corresponding positions of the second lower die 102 are processed with the second grooves 1092, when the second upper die 101 is buckled with the second lower die 102, the protruding blocks are matched with the second grooves 1092 to realize the clamping connection of the second upper die 101 and the second lower die 102, the stroke of the second upper die 101 is limited, the purpose of size adjustment of the intermediate blank 201 is achieved, the lower end of the second lower die 102 is provided with the second mounting groove 1021 for enabling the second lower die 102 to be fixedly mounted on the multi-directional hydraulic press when the second lower die 102 is mounted on the multi-directional hydraulic press, and two second first ejector pin holes 202 which are symmetrical with the central line of the cavity 104 are processed at the position of the forming cavity of the second lower die 102, when the second lower die 102 is mounted on the multi-directional hydraulic press, the second first ejector pin holes 202 and ejector pins are matched with the ejector pins to realize the positioning of the mounting positions of the second lower die 102, and simultaneously the intermediate blank 201 can be conveniently processed from the intermediate blank 201 after the intermediate blank 201 is mounted on the multi-directional hydraulic press.

The device also comprises a primary mold core 105 for shaping and adjusting the inner hole of the middle part of the middle blank 201, the shape of the primary mold core 105 is the shape which is finally needed to be processed and formed by the middle blank 201, when the primary mold core 105 is used for shaping and adjusting the inner hole of the middle blank 201, the primary mold core 105 stretches into the middle part of the middle blank 201 from a small end 1052, a conical buffer head 106 is integrally formed at one end part of the primary mold core 105 which does not stretch into the middle part of the middle blank 201, the inclination angle of the conical buffer head 106 can be 19-21 degrees, for example 20 degrees, and the device also comprises a primary mold core pressing ring 207 for fixing the primary mold core 105, a primary mounting hole 205 which is consistent with the shape of the conical buffer head 106 and matched with the conical buffer head is arranged at the center of the primary mold core pressing ring 207, the primary through holes 204 for fixing the primary die core pressing ring 207 and the multi-directional hydraulic machine are formed in the primary die core pressing ring 207 around the primary mounting hole 205, a first limit table 107 is integrally formed at the other end of the conical buffer head 106 for better fixing the primary die core 105 and the primary die core pressing ring 207, meanwhile, in order to avoid that the multi-directional hydraulic machine can not drive the primary die core 105 to extend into the middle of a first shaping workpiece due to dislocation caused by rotation of the primary die core 105 after the primary die core pressing ring 207 and the primary die core 105 are mounted, primary limit grooves 206 matched with the limit tables are formed in positions corresponding to the limit tables after the primary die core pressing ring 207 and the primary die core 105 are mounted, and when the primary die core 105 is mounted in the primary die core pressing ring 207, limiting of the primary die core 105 is achieved through cooperation of the primary limit grooves 206 and the first limit tables 107.

The primary shaping die comprises the following using processes: the second upper die 101 and the second lower die 102 are fixedly installed on a multi-directional hydraulic press through a first installation groove 1011 and a second installation groove 1021, the primary upper molding cavity 103 of the installed second upper die 101 is opposite to the primary lower molding cavity 104 of the second lower die 102, then the primary die core 105 is passed through the primary installation hole 205 of the primary die core pressing ring 207, so that the conical buffer head of the primary die core 105 is attached to the primary installation hole 205 of the primary die core pressing ring 207, the first limiting table 107 of the primary die core 105 is fixed in the primary limiting groove 206 of the primary die core pressing ring 207, then the primary die core pressing ring 207 is installed on the multi-directional hydraulic press, so that the central point of the primary die core pressing ring 207 and the central axis of the molding cavity formed when the second upper die 101 and the second lower die 102 are buckled is on a straight line, then the intermediate blank 201 is placed at a position within the second limit table 108 of the primary lower molding cavity 104, then a multi-way hydraulic press is started to drive the second upper die 101 to press downwards, after the second upper die 101 and the second lower die 102 are buckled, the primary die core 105 is driven to move towards the middle part, the primary die core 105 continuously expands the intermediate blank 201 in the process of moving towards the middle part of the intermediate blank 201, so that the intermediate blank 201 is attached to the cavity wall of the molding cavity to finish the first shaping of the intermediate blank 201, meanwhile, the primary die core 105 extrudes redundant materials in the middle part of the intermediate blank 201 out of the middle part of the intermediate blank 201 to finish the inner hole shaping of the intermediate blank 201, the inner hole shaping and the size adjustment of a workpiece are finished under the control of the multi-way hydraulic press in the second upper die 101, the second lower die 102 and the primary die core 105, and the deformation amount generated by the intermediate blank 201 in the processing process is ensured to be in a controllable range of deformation, thereby reducing the probability that the intermediate blank 201 will not be scrapped during the shaping process. Because the thickness of the intermediate blank 201 is greater than or equal to the cavity height of the molding cavity in the primary shaping mold, when the second upper mold 101 is pressed down, the molding cavity of the second upper mold 101 directly contacts with the plane of the intermediate blank 201 to fix the intermediate blank 201, preventing the intermediate blank 201 from moving in the molding cavity under the action of the primary mold core 105 when the primary mold core 105 extends into the middle of the intermediate blank 201, and facilitating the primary mold core 105 to extend into the middle of the intermediate blank 201 to perform primary shaping.

And (3) a secondary shaping die:

after the first shaping mold shapes, the inclination angle and the size of the first side 5011 and the first side 5011 of the first shaping workpiece 501 in fig. 14 need to be adjusted again, so as to avoid that the first shaping workpiece 501 is scrapped in the processing process due to the large deformation amount when the first side 5011 and the second side 5012 are simultaneously adjusted at one time, therefore, the inclination angle of the second third inclined groove 3042 and the second fourth inclined groove 3043 of the second shaping mold cavity 304 can be set to be smaller than or equal to the angle corresponding to the inclined surface in the second side 5012 of the final product in design, so that the second lower shaping mold cavity 304 is more attached to the first shaping workpiece 501, the second side 5012 is ensured not to deform or to deform less in the downward extrusion process of the third upper mold 301, the rejection rate of the product is reduced, and the size and the inclination angle of the first side 5011 of the shaped second shaping workpiece after shaping is ensured to be consistent with the requirement of the final product.

As shown in fig. 12-16, the second shaping mold comprises a third upper mold 301 and a third lower mold 302, the third upper mold 301 comprises a first step 3011, a second step 3012 and a third step 3013 which are gradually narrowed from top to bottom, the first step 3011 is clamped with the multi-directional hydraulic machine when the third upper mold 301 is installed on the multi-directional hydraulic machine, the third upper mold 301 is prevented from shaking when the multi-directional hydraulic machine is started to drive the third upper mold 301 to press downwards, the second step 3012 is clamped with the upper surface of the third lower mold 302 in the process of pressing down the third upper mold 301, the stroke of pressing down the third upper mold 301 is limited, the lower end of the third step 3013 is provided with a second upper shaping cavity 303, the second upper shaping cavity 303 comprises a second first through groove 3031, a second first inclined groove 3032, a second inclined groove 3033, a second inclined groove 3034 and a second inclined groove 3035 which are sequentially communicated along the axial direction, and the second inclined groove 3034 is arranged to be 11 degrees, for example, and the third upper mold 301 to be positioned to be 11.4 degrees when the third upper inclined mold is installed on the upper mold to be positioned to be a blind hole; the upper end of the third lower die 302 is provided with a secondary lower forming cavity 304, the secondary lower forming cavity 304 comprises a secondary fourth groove 3041, a secondary third inclined groove 3042, a secondary fourth inclined groove 3043 and a secondary fifth through groove 3044 which are sequentially communicated in the axial direction, the inclination angle of the secondary fourth inclined groove 3043 is set to be 40-45.5 degrees, for example, 45.5 degrees, when the third upper die 301 is buckled with the third lower die 302, the secondary upper forming cavity 303 and the secondary lower forming cavity 304 form a forming cavity in a closed state, the forming cavity is symmetrical along the center line of the die, a guide angle 402 which is convenient for the third step 3013 of the third upper die 301 to extend in is arranged at the opening of the upper end of the secondary lower forming cavity 304, a groove 305 which is symmetrical on both sides is arranged at the lower end of the third lower die 302, the second upper die is convenient to fix when the third lower die 302 is installed on a multidirectional hydraulic press, a secondary ejection pin hole 401 is formed in the center of the secondary lower forming cavity 304, when the third lower die 302 is installed, the secondary ejection pin hole 401 is used for positioning the secondary ejection pin hole 401, and the secondary ejection pin 501 can finish the secondary ejection pin processing work of a workpiece from the second ejection pin 501.

The secondary die core 307 is used for shaping the middle part of the first shaping workpiece 501, the shape of the secondary die core 307 is consistent with the shape of the shaping cavity, the secondary die core 307 stretches into the middle part of the first shaping workpiece 501 during operation, the small end 3072 of the secondary die core 307 stretches into the middle part of the first shaping workpiece 501, the end part of the large end 3071 of the secondary die core 307 is integrally formed with a conical buffer head, meanwhile, a secondary die core 307 clamping ring 306 used for fixing the secondary die core 307 is arranged, a secondary mounting hole 405 consistent with the shape of the conical buffer head is formed in the center of the secondary die core 307 clamping ring 306, and the secondary die core 307 can be mounted in the secondary mounting hole 405 in a fitting way, in order to realize the fixation of the secondary die core 307 and the secondary die core 307 clamping ring 306, a limiting table is integrally formed at the other end of the conical buffer head of the secondary die core 307, in order to avoid that after the secondary mold core 307 pressing ring 306 is installed with the secondary mold core 307, the secondary mold core 307 rotates to generate dislocation, so that the multidirectional hydraulic press cannot drive the secondary mold core 307 to extend into the middle of the first reshaping workpiece 501, therefore, a limit groove is formed in the corresponding position of the limit table after the secondary mold core 307 pressing ring 306 and the secondary mold core 307 are installed, secondary through holes 404 are formed around the secondary installation holes 405 of the secondary mold core 307 pressing ring 306, the secondary through holes 404 can be used for realizing the fixed installation of the secondary mold core 307 pressing ring 306 and the multidirectional hydraulic press in a bolt, a locating pin and the like, and meanwhile, the secondary mold core 307 pressing ring 306 and the secondary mold core 307 are arranged into a detachable mode, so that when the size of the secondary mold core 307 needs to be replaced, only the secondary mold core 307 needs to be replaced, and the secondary mold core 307 pressing ring 306 can be reused.

The second shaping die is used in the following process: the third upper die 301 and the third lower die 302 are installed on a multidirectional hydraulic machine, the secondary die core 307 passes through a secondary installation hole 405 of a secondary die core 307 die ring 306 and is fixed with the secondary die core 307 die ring 306, then the secondary die core 307 die ring 306 is fixed on the multidirectional hydraulic machine, a secondary upper forming cavity 303 of the third upper die 301 is opposite to a secondary lower forming cavity 304 of the third lower die 302, the secondary die core 307 is installed in the secondary die core 307 die ring 306 so that a limiting table is clamped in a limiting groove, a conical buffer table is attached to the secondary installation hole 405, then the secondary die core 307 die ring 306 is fixedly installed on the multidirectional hydraulic machine 307 so that the center point of the secondary die core 306 is on the central axis of the forming cavity formed when the third upper die 301 and the third lower die 302 are buckled, and then placing the first shaping workpiece 501 in the second lower shaping cavity 304 in a mode that the small end 5014 is close to the large end 5013 of the middle part of the die and the second side 5012 is in surface contact with the upper surface of the third lower shaping cavity 304, starting a multi-directional hydraulic press to control the third upper die 301 to press downwards, controlling the second die core 307 to extend into the middle part of the first shaping workpiece 501 when the second upper shaping cavity 303 of the third upper die 301 is in contact with the first shaping workpiece 501, then controlling the third upper die 301 to continuously press downwards, and when the second step 3012 of the third upper die 301 is pressed down to be in contact with the upper surface of the third lower die 302, not continuously pressing downwards 307, and controlling the second die core 307 to press the material to be shaped back and forth in the first shaping workpiece 501 to realize in-hole shaping.

The inclination of the second third inclined groove 3042 and the second fourth inclined groove 3043 in the second lower molding cavity 304 is smaller than that of the final product when the mold is arranged, so that the second side 5012 is more attached to the bottom surface of the second lower molding cavity 304 when the first shaping workpiece 501 is placed in the second lower molding cavity 304, deformation of the second side 5012 generated when the third upper mold 301 is extruded is reduced, and the probability of scrapping when the second shaping mold in the application processes the first shaping workpiece 501 is reduced.

The outside of the second core mould is sleeved with a detachable fixed sleeve, and the secondary mould core pressing ring is annular, so that the core mould can only move horizontally in a centering way along the secondary mould core pressing ring.

The foregoing is merely exemplary embodiments of the present invention, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims

1. A stay wire shell processing die is characterized in that: comprises a water expansion die and a shaping die;

the water expansion die comprises a first upper die and a first lower die, wherein a first die groove capable of being attached to the middle blank is formed in the first upper die, a second die groove capable of being attached to the middle blank is formed in the first lower die, the first die groove and the second die groove can be spliced into a spindle-shaped middle blank, core rods capable of being abutted against two ends of the flat tube are respectively inserted into two ends of the first die groove and the second die groove, and a first channel capable of being communicated with a peripheral liquid medium is formed in the core rods;

the shaping die comprises a primary shaping die and a secondary shaping die, the primary shaping die comprises a second upper die and a second lower die, a primary upper shaping cavity is formed in the lower end of the second upper die, the primary upper shaping cavity comprises an upper side edge and a lower side edge, the upper side edge comprises a primary first through groove, a primary first inclined groove, a primary second through groove, a primary second inclined groove and a primary third channel which are sequentially communicated, the lower side edge comprises a primary fourth through groove, a primary third inclined groove, a primary fifth through groove, a primary fourth inclined groove and a primary sixth through groove which are sequentially communicated, a primary lower shaping cavity which is matched with the primary upper shaping cavity and has the same shape is formed in the upper end, the primary upper shaping cavity and the primary lower shaping cavity are matched to form a shaping cavity in a closed state, the shaping cavity is divided into a left shaping cavity and a right shaping cavity along the central line of the die, and the shaping cavity and the shaping die core and the left shaping cavity are two primary cores which have the same shape as the left shaping cavity;

the secondary shaping die comprises a third upper die and a third lower die, wherein a secondary upper shaping cavity is formed at the lower end of the third upper die, and comprises a secondary first through groove, a secondary first inclined groove, a secondary second through groove, a secondary second inclined groove and a secondary third through groove which are sequentially communicated along the axial direction; the upper end of the second lower die is provided with a second lower forming cavity, and the second lower forming cavity comprises a second fourth groove, a second third inclined groove, a second fourth inclined groove and a second fifth groove which are communicated in sequence along the axial direction; the secondary upper molding cavity and the secondary lower molding cavity are matched to form a molding cavity in a closed state, the molding cavity is symmetrical along the center line of the mold, and the mold further comprises two secondary mold cores with the same shape as the half molding cavity.

2. The wire casing machining die of claim 1, wherein: and a detachable secondary mold core pressing ring is sleeved outside the second core mold.

3. A stay wire shell processing method is characterized in that:

step 1, preparing materials: the round tube is processed into a flat tube according to 105-110% of the volume of the two molded parts after molding;

step 3, primary water expansion: the mandrel of the water expansion die seals two ends of the flat pipe, and pressurizes a liquid medium into the flat pipe through a first channel of the mandrel, water is expanded to form an intermediate blank, and the pressurizing pressure of the liquid medium is 20-30 Mpa;

step 4, sawing: taking out the middle blank, and sawing the middle blank from the center of the middle blank to obtain two blanks to be shaped;

step 7, annealing: heating the workpiece to 500-550 ℃, preserving heat for 2-8 hours, and cooling to obtain the finished workpiece.

4. The method for processing a wire casing according to claim 1, wherein: and the step 2 is preceded by lubricating graphite powder on the inner surface of the water swelling mold.

5. The method for processing a wire casing according to claim 1, wherein: and the step 7 is preceded by chamfering and forming openings at two ends of the workpiece.

6. The method for processing a wire casing according to claim 1, wherein: the round tube in the step 1 is a Q355 seamless round tube.

7. The method for processing a wire casing according to claim 1, wherein: and the step 3 is preceded by winding a waterproof film on the outer surface of the flat pipe.