CN1178150A - Method and apparatus for machining internal thread with hydraulic driving tools - Google Patents

Abstract

A method for machining internal screw in pipe by cutting-tool driven hydraulically includes positioning raw pipe and machining steps. Its apparatuses include die pressing unit for raw pipe, cutting-tool fixture, feeder, hydraulic machining system and hydraulic operation system. The cutting-tool is a spiral cylinder with axial liquid flowing glooves between spiral threads and cutting end. There is internal screw engaged with cutting-tool in the cutting-tool cavity of cutting-tool seat. When high-speed fluid comes into cutting-tool cavity, the cutting-tool is forced to move forward and rotate along the screw in the cavity. Then it continuously moves forward into raw pipe where screw is machined hydraulically. Its advantages include simple technology and apparatus, easy operation, small pitch angle of the finished internal screw, better heat exchange efficiency, low requirement to precision of pipe size and low cost.

Description

A kind of method and apparatus that drives cutter processing tube internal thread with fluid power

The present invention relates to manage the processing method and the equipment of internal thread, particularly drive the processing method and the equipment of cutter processing tube internal thread with fluid power.

Riffled tube is a kind of novel efficient heat-exchange tube that development in recent years is got up.Owing to manage the existence of inside spin convex tendon and groove, increased the interior heat transfer area of heat-exchange tube, can make heat-carrying (cooling) medium in pipe, be turbulent shape again simultaneously, thereby accelerate heat exchanging process.The processing method of riffled tube mainly is the principle according to metal forming at present, processing method by drawing mould is produced riffled tube, its operation comprises that stretching copper pipe base (annealed state), riffled tube dish draw, scale is cut in shaping, cleaning by degreasing, dry up, finished products etc., capital equipment is a plate drawing machine, adopt this method complex procedures, the energy consumption height, the production cost height.

It is simple to the purpose of this invention is to provide a kind of production process, the method and apparatus of the processing tube internal thread that energy consumption is low.

The present invention proposes a kind of method that adopts the vertical bar pipe to drive cutter processing tube internal thread with fluid power by the principle of metal machining, comprise material pipe location, machining operation, in material pipe positioning process, the straight material pipe of intended size is sent in the die cavity of mould, through the location, matched moulds, supercharging locked mode, improve the caliber size precision; In the machining operation, earlier cutter is put into the base of tool, this cutter is the helical form cylinder, circumferential distribution screw thread, have spirality between screw thread and the screw thread vertically and cross liquid bath, the threaded end of cutter end is processed into cutting edge, the internal thread that is meshed with cutter is arranged in the base of tool, the base of tool of cutter and the material Guan Yiduan sealed attachment after the mold pressing will be housed then, the high-velocity fluid that will be produced by pressue device imports in the base of tool from the other end of the base of tool again, when fluid is crossed liquid bath by the spirality between cutter and base of tool inwall, cutter is produced the moment of momentum, force cutter to rotate by the connection thread rotary orientation in the base of tool, advance, and obtain processing preceding initial velocity and centripetal force, and entering then in the material pipe to be processed, cutter carries out machining to the material inside pipe wall under the effect of high-velocity fluid, make the material inside pipe wall form internal thread, smear metal and cutter successively flow out with the other end of fluid by the material pipe; The material pipe that unloads after the processing promptly obtains riffled tube.

The number of starts 2-3 bar of above-mentioned cutter, crossing the tangent line of liquid bath cross section centre of form trace and the space angle of cut of tool axis is 40 °-55 °, and fluid media (medium) selects for use density big, and the medium that kinematic viscosity is low is during the processing small-bore pipe, with mercury the best.

A kind of equipment that drives cutter processing tube internal thread with fluid power, it has material pipe die pressure device, the cutter and the base of tool, the hydraulic pressure system of processing is formed, material pipe die pressure device comprises cover half, dynamic model and mold closing mechanism, cover half is fixed on the frame, dynamic model is connected on the mold closing mechanism: cutter is the helical form cylinder, circumferential distribution external screw thread, offer spirality between screw thread and the screw thread vertically and cross liquid bath, the threaded end of cutter end is processed into cutting edge, base of tool both ends open, in tool cavity is arranged, the sidewall of tool cavity has the internal thread that is meshed with cutter, cutter can screw in the tool cavity; The hydraulic pressure system of processing comprises holds the liquid case, pressue device, compression fittings, edge splice grafting head and retractor device, the fluid inlet and outlet of pressue device respectively by control valve with hold liquid case and compression fittings and communicate, edge splice grafting head by control valve with hold the liquid case and communicate, compression fittings and edge splice grafting head are fixed on the cover half both sides by retractor device, the base of tool is between compression fittings and cover half, when retractor device is done feed motion, can promote compression fittings and do relative motion with edge splice grafting head, moving behind the compression fittings promotion base of tool and the matched moulds, cover half sidewall and material pipe carry out pressing and sealing, moving behind edge splice grafting head and the matched moulds, another sidewall of cover half and material pipe carry out pressing and sealing, make the tool cavity of compression fittings by the base of tool, the material pipe is connected with edge splice grafting head, constitute hydraulic pressure processing loop, when retractor device does to shrink back action, compression fittings and edge splice grafting head are retired to both sides, and above-mentioned hydraulic pressure processing loop disconnects.

Described mold closing mechanism is a closing cylinder, pressue device is the booster-type injection cylinder, the import and export of its injecting cavity respectively with hold the liquid case and the plus-pressure joint communicates, retractor device is two telescoping cylinders, the hydraulic operating system control that the action of above-mentioned closing cylinder, injection cylinder, telescoping cylinder is made up of fuel tank, oil pump, control valve, connecting tube.

Above-mentioned cover half is the regular polygon prism, be installed on the frame by rotating shaft, each post is drawn and is all had material pipe die groove, the base of tool is positioned at a side of cover half, and circumferentially be fixed on the cover half, the base of tool is provided with cutter shell chamber in the position corresponding with cover half die cavity axis, and cutter is packed into by the cutter shell in the cutter shell chamber, in the cutter shell tool cavity is arranged, the sidewall of tool cavity has the internal thread that is meshed with the cutter external screw thread.

Described equipment also has cutter loading and unloading device, it is by dress cutter push rod, unload the shell pull bar, connecting plate, chute, the ejection baffle plate is formed, connecting plate is enclosed within the cover half rotating shaft, and be fixed on the compression fittings, adorn the cutter push rod and unload the shell pull bar and be fixed on the connecting plate, compression fittings, dress cutter push rod and to unload the front end of shell pull bar corresponding with a cutter shell chamber respectively, adorn between the cutter push rod cutter shell chamber corresponding chute is arranged with it, the shell cutter assembly that cutter is housed can be inserted in the chute, the front end that unloads the shell pull bar is equipped with and unloads the shell hook, unloads the shell plate washer and is fixed on a side of unloading the shell pull bar between the connecting plate and the base of tool by frame.

Between the described base of tool and the cover half spring is housed.

Conversion of cover half working face and location are realized by slide block swing-lever ratchet mechanism that is positioned at another side of cover half and thimble, slide block swing-lever ratchet mechanism is made up of slide block, crank rocking beam, ratchet, slide block is fixed on the dynamic model, ratchet is fixed in the cover half rotating shaft, crank rocking beam one end is connected with ratchet, and slideway is arranged on the body of rod; Thimble circumferentially is fixed on the frame, between thimble and frame spring is housed, and it is the groove of numbers such as equidistant even distribution in center and cover half cylinder that cover half side and thimble correspondence position have with the axle center, and spring is pressed into realization location in the above-mentioned groove with the top of thimble.

Because cutting process processing tube internal thread is adopted in invention, production technology is simplified, this process equipment is simple, easy operating control, and because a number few (2 to 3) of the pipe internal thread of this method processing, the angle of pitch is little, heat exchanger effectiveness is better, and relatively low to the bore dimension precision requirement, thereby its energy consumption is lower, production cost is low.

Fig. 1 is a machining functional-block diagram of the present invention

Fig. 2 is the equipment hydraulic system and the mechanical schematic of processing tube internal thread of the present invention

Fig. 3 be Fig. 2 along I-I to structural representation

Fig. 4 be among Fig. 3 under the matched moulds state C portion enlarged drawing

Fig. 5 is that Fig. 4 is along A-A line cutaway view

Fig. 6 is that Fig. 4 is along B-B line cutaway view

Below in conjunction with embodiment the present invention is described in detail:

By shown in Figure 1, after the material pipe 15 of intended size being sent in the die cavity of cover half 19, position then, dynamic model 6 matched moulds and supercharging, again by retractor device 10,10 ' base of tool 4 of cutter will be housed and edge splice grafting head 9 advances and connect with material pipe 15 two ends, constitute the loop of this hydraulic pressure system of processing, open control valve 12 then, 12 ', 1 pair of hydraulic pressure processing of pressue device loop pressurization makes the fluid media (medium) flow at high speed, fluid flow through between cutter and base of tool inwall cross liquid bath the time cutter rotate advance, obtain machining preceding rotation initial velocity and centripetal force in the base of tool.Cutter advances the machining of in the feeding pipe material inside pipe wall being carried out internal thread, and the cutter after smear metal in the working angles and cutting are finished is successively brought into by fluid media (medium) by the other end of material pipe and held in the liquid case 11.After treating that above-mentioned internal thread machining finishes, closed control valve 12,12 ', dynamic model 6 is opened, retractor device 10,10 ' retire to both sides, riffled tube 15 is with after separate in the loop, and the tube fluid medium falls in the material-receiving device of bottom, unload the riffled tube that processes, finish the time processing circulation.When accumulating fluid media (medium) and reach a certain amount of in the material-receiving device, liquid supply device 13 just will hydrops drain into and hold liquid case 11, to hydraulic pressure processing loop fluid infusion.The selection of the fluid media (medium) in the hydraulic pressure processing loop should be a high density, and when the fluid of harmonic motion viscosity, the riffled tube of processing small-bore pipe such as the heat-transfer pipe (coil pipe) in the air-conditioner air cooled condenser, fluid media (medium) is selected mercury the best for use.The number of starts 2-3 bar of cutter, crossing the tangent line of liquid bath cross section centre of form trace and the space angle of cut of tool axis is 40 °-55 °.

By shown in Figure 2, equipment of the present invention comprises material pipe die pressure device, cutter loading and unloading device, feed arrangement, hydraulic pressure system of processing, hydraulic operating system.Material pipe die pressure device is made up of cover half 19, dynamic model 6, matched moulds one pressurized cylinder 5, and cover half 19 is orthohexagonal prism for cross section, is installed on the frame 24 by rotating shaft, and six cylinders all have material pipe die groove.Two cylinder bodies of matched moulds one pressurized cylinder 5 fuse, and upward are pressurized cylinder, are closing cylinder down.Dynamic model 6 is connected on the piston rod of closing cylinder.The working face conversion of cover half 19 and location are realized by the slide block swing-lever ratchet mechanism 8 that is positioned at the cover half right side, thimble 14.Slide block swing-lever ratchet mechanism is made of slide block, crank rocking beam 8, ratchet, and slide block is connected on the dynamic model its right end face, and slideway is arranged on the crank rocking beam, and an end connects ratchet, and the other end is connected with slide block by slideway, and ratchet is fixed in the cover half rotating shaft.In the first half term of dynamic model 6 die sinkings, stir crank rocking beam by the slide block that is connected on the dynamic model 6, crank rocking beam is stirred the rotation that ratchet is made π/3 angles, makes working face of cover half 19 conversions.Thimble 14 circumferentially is fixed on the frame 24 by thimble seat, by spring thimble 14 is pressed in cover half 19 its right end face, cover half its right end face and thimble 14 relevant positions are that the center circumferentially is evenly distributed with 6 grooves with the axle center, when cover half rotates, promote thimble compression spring and withdraw from a groove, when cover half rotated π/3 angles, thimble 14 entered next groove under the effect of spring, make the cover half location.Cover half also realizes drawing off the material pipe of having processed simultaneously in the rolling transposition process.

Form by material pipe storehouse 25, connecting rod ratchet mechanism 27, material toggling gear 28, position, school plate 7, hyoplastron 29 by Fig. 2, feed arrangement shown in Figure 3, the connecting rod of connecting rod ratchet mechanism 27 and dynamic model left end face are hinged, ratchet and material toggling gear are installed in below, material Guan Cang exit position by rotating shaft, position, school plate and hyoplastron are fixed on the material pipe storehouse by bearing pin and button spring, during the dynamic model matched moulds, dynamic model high-ranking officers position plate 7 and hyoplastron 29 are pressed from the cover half working face, and during the dynamic model die sinking, position, school plate and hyoplastron automatically reset under the effect of button spring.Position, school plate 7 is positioned at the cover half both sides, distance between the plate of position, school is slightly larger than the length of material pipe, can make the material tubular axis to the location, the lower end aligned cover half die cavity of hyoplastron, material pipe storehouse 25 is positioned at the top of hyoplastron 29, gear teeth of material toggling gear 28 are stretched in the outlet of feeding pipe storehouse, in the second half of dynamic model die sinking, drive the ratchet rotation by the connecting rod that is hinged on the dynamic model by crank, make material toggling gear 28 turn over the angle of gear teeth, transfer to a material pipe by the gear teeth, the material pipe falls in the die cavity of cover half 19 along hyoplastron 29 between the plate of position, school, and the next gear teeth of material toggling gear are stretched in the outlet of feeding pipe storehouse simultaneously.For prevent that the material toggling gear from rotating under the effect of material pipe gravity, its other end is provided with ring spring.

The hydraulic pressure system of processing by hold liquid case 11, injection cylinder 1, left and right sides telescoping cylinder 10 and 10 ', check-valves, connecting pipe form.Left and right sides telescoping cylinder 10,10 ' be two bar double acting hydraulic cylinders, piston rod is hollow rod member, is the part in hydraulic pressure processing loop.The relative extension of telescoping cylinder piston rod, the left and right sides is respectively compression fittings 33 and edge splice grafting head 9, the other end respectively by flexible pipe with injection cylinder and hold liquid case 11 and be communicated with; The port of compression fittings 33 has the conical surface, on the edge splice grafting head 9 sealing device is arranged, and the fix a cutting tool connection sealing device of chamber right-hand member of its structure and the base of tool is identical, is made up of sealing ring, gland, lid, and the endoporus of gland has tapering.Injection cylinder 1 is double acting single pole supercharged hydraulic cylinder, and its piston and bar will be divided into three chambeies in the cylinder body, and the hydraulic cavities of the front end of piston rod is an injecting cavity, and piston rod also is the plunger of injecting cavity, and the fluid inlet and outlet of injecting cavity is equipped with check valve.Right telescoping cylinder 10 ' and hold be equipped with between the liquid case 11 swing check valve 12 ', check-valves 12 ' and right telescoping cylinder between air bleeding valve also is housed.

Shown in Fig. 5,6, cutter loading and unloading device by tool magazine 26, dress cutter push rod 42, unload shell pull bar 39 and form.The base of tool 4 covers are associated in the rotating shaft and slide bar in cover half 19 left sides, this slide bar is a polished rod bolt 20, be fixed on the side of cover half 19, make the base of tool can be, and can endwisely slip, spring 37 is housed between the base of tool and the cover half with respect to cover half with the cover half coaxial rotation, the base of tool circumferentially is evenly distributed with six cutter shell chambeies, the position is corresponding with the die cavity axis of cover half 19, and the port inner wall that die cavity is led in cutter shell chamber is set with sealing ring and gland 36, and port is fixing with covering 38.Dress cutter push rod 42 and unload shell pull bar 39 and be fixed on the connecting plate 32, this connecting plate 32 are enclosed within the cover half rotating shaft and are connected with the compression fittings 33 of left telescoping cylinder 10; Compression fittings 33, dress cutter push rod 42 and to unload the position of shell pull bar 39 on connecting plate 32 be that radiuses such as the center is circumferential are 120 ° and evenly distribute for the axle center with the cover half rotating shaft, front end is corresponding with a cutter shell chamber respectively.Between the dress cutter push rod and the base of tool chute 43 is arranged, chute 43 organic frames connect, and tool magazine 26 communicates with chute 43 by cutter slideway 40; Unload the front end below of shell pull bar and unload the shell hook, this unloads the shell hook and is fixed on pin and button spring and unloads on the shell pull bar, its top is to half greater than cutter shell internal diameter of the height of the bar heart that unloads the shell pull bar, and less than its internal diameter, a side of unloading shell pull bar 39 between the connecting plate 32 and the base of tool has unloads shell plate washer 3 on the frame of being connected in.Cutter 35 is the foliaceous conveyor screw, and outer surface has 2 external screw threads, has spirality between screw thread and the screw thread vertically and crosses liquid bath, and the thread head at cutter two ends is processed into cutting edge; Cutter shell 34 both ends opens, in tool cavity is arranged, the tool cavity sidewall has the internal thread with the threaded engagement of cutter, cutter 35 entrance points of cutter shell have the conical surface that cooperates with compression fittings.When left telescoping cylinder 10 work promotion compression fittings 33 are made axial feed to the right, dress cutter push rod 42 will be pushed in the cutter shell chamber by the shell cutter assembly 41 that cutter be housed of tool magazine 26 in cutter slideway 40 falls into chute 43, unloading shell pull bar 39 simultaneously also moves right, the shell hook is unloaded in the compression of the cutter shell inwall of withdrawing, make the shell hook portion that unloads that unloads shell pull bar front end pass through the cutter shell, unloading shell is hooked under the effect of button spring and resets, 33 conical surfaces of compression fittings with its front end hold out against the base of tool fix a cutting tool in the shell chamber shell cutter assembly and promote the base of tool and move right, the gland 36 of the cutter shell chamber right-hand member of base of tool upward pressure joint correspondence is enclosed within on the oriented material pipe 15, one end is pressed in fixed, the dynamic model sidewall, the other end compresses sealing ring, realize that compression fittings connects with the pressure of cutter shell end face and gland and the edge of material pipe external part close and connect and seal, simultaneously, the edge splice grafting head 9 of right telescoping cylinder 10 ' piston rod end also will be spliced at the other end of material pipe 15, realize material pipe Butt sealing, hydraulic pressure processing loop is connected.After time processing finishes, telescoping cylinder 10,10 ' retraction, compression fittings 33 drives connecting plate 32 to left movement, the base of tool resets left under the effect of spring 37, separate with the material pipe, the shell hook that unloads that unloads shell pull bar 39 simultaneously hooks the cutter shell, and together withdraws from cutter shell chamber, the cutter shell breaks away under the stopping of unloading shell plate washer 3 and unloads shell push rod 39, thereby realizes shelling.Dress cutter push rod returns to the left side of cutter slideway also along with connecting plate moves to left, and the shell cutter assembly 41 in the cutter slideway 40 slips in the chute under the effect of deadweight.

Hydraulic operating system is made up of fuel tank 22, oil pump 21, control valve, accumulator 23, connecting pipe etc., and the work loop of injection cylinder is by accumulator 23, overflow valve 1., check valve 3., 2. the 3-position 4-way electro-hydraulic reversing valve wait formation; Telescoping cylinder parallel operation loop, the left and right sides by check valve 7., the 3-position 4-way solenoid directional control valve is 6., 8. adjustable throttling constitute, 3-position 4-way solenoid directional control valve meta function 6. is the Y type; The work loop of closing cylinder by the stroke valve 9., 10. the 3-position 4-way electro-hydraulic reversing valve reach hydraulic control one-way valve and constitute, the supercharging of pressurized cylinder and depressurized circuit are made of check valve, two-position four-way electro-hydraulic reversing valve, 4. the main pressure loop at oil pump 21 places is parallel with overflow valve, and solenoid directional control valve 5..

The groove 16 that connects material below cover half, cutting back material pipe and fluid raffinate fall into the groove that connects material, and fan and air channel are housed on the cell wall that connects material, and are taken away by the mercuryvapour that fan will connect material in the groove.The liquid medium that falls into the groove 16 that connects material is drained into by hydraulic pump 13 through check-valves and holds in the liquid case 11, to holding 11 fluid infusion of liquid case.

This equipment is work like this:

1, matched moulds and locked mode operating mode: closing cylinder 5 is in the matched moulds process, and along with moving down of dynamic model 6, the connecting rod ratchet mechanism 27 at its left and right two ends slides with the ratchet that slide block swing-lever ratchet mechanism 8 drives them; And depress position, school plate 7 and hyoplastron 29 matched moulds, pressurized cylinder 5 supercharging locked modes.

2, the telescoping cylinder piston rod docks operating mode with the material pipe: behind the pressurized cylinder locked mode, telescoping cylinder 10, the 10 ' piston rod of module 6,19 both sides advance relatively, and the edge splice grafting head 8 that the compression fittings 33 of left end heads on gland 36 in the base of tool 4 and right side simultaneously and 15 sockets of material pipe.Simultaneously, the shell pull bar 39 that unloads on the cutter loading and unloading device 2 stretches in the base of tool 4 bottom-right cutter shells 34; Dress cutter push rod 42 heads on the shell cutter assembly community of cutter (be packed in the cutter shell) 41 of cutter slideway 40 bottoms, enters (see figure 5) in the cutter shell chamber of base of tool lower left along chute 43

3, injection cylinder injection operating mode: injection cylinder 1 treats that above-mentioned operating mode finishes the back start injection, and the fluid media (medium) that its piston rod promotes in its right-hand member injecting cavity flows in the tool cavity of shell cutter assembly by compression fittings 33 high speeds.When fluid media (medium) is crossed the liquid bath hole by the spirality of 34 on cutter 35 and cutter shell, just cutter is produced the moment of momentum, forces cutter by the rotation of the connection thread rotary orientation in the cutter shell, propelling, thereby acquisition cutter 35 advances initial velocity and centripetal force before feeding pipe 15 carries out machining.In working angles.After finishing with the internal thread cutting of material pipe 15, its smear metal and cutter 35 (the former is prior to the latter) flow to and hold liquid case 11 by inlaying splice grafting head and rotary type check-valves with fluid media (medium).Because during the small-bore riffled tube of processing, the fluid media (medium) in hydraulic pressure processing loop adopts mercury, is convenient to fish for recovery on the liquid level so cutter 35 and smear metal will swim in.

4, move operating mode behind injection cylinder and the telescoping cylinder piston: when moving behind injection cylinder 1 piston, inlet flow body medium in the injecting cavity of piston rod right-hand member.Move behind telescoping cylinder 10, the 10 ' piston, drive compression fittings 33 and edge splice grafting head 8 respectively and withdraw and expect to manage 15 connect, the base of tool 4 by spring 37 tops from, make material manage 15 and break from hydraulic circuit.Liquid in pipe flows in the groove 16 that connects material, and when liquid level reach a certain height in the groove 16 that connects material, by float switch primer fluid press pump 13, hydrops is discharged to holds in the liquid case 11.Simultaneously, the shell hook that unloads that has stretched in the cutter shell 34 is pulled out cutter shell 34 in the base of tool 4, stop that through unloading shell baffle plate 3 cutter shell 34 withdraws from from unloading shell pull bar 39 again, falls in the receiving system; This fashionable dress cutter push rod 42 also returns to the left side of cutter slideway 40, falls into new shell cutter assembly 41 on the chute 43 again.(seeing Fig. 5,6)

5, die sinking operating mode: at first pressurized cylinder release, closing cylinder 5 pistons drive and move on the dynamic model 6 is die sinking.In the die sinking process, position, school plate 7 also lifts under spring action with hyoplastron 29 and resets.The slide block swing-lever ratchet mechanism of module two ends connection simultaneously and connecting rod ratchet mechanism successively drive cover half 19 and turn an angle with the material toggling gear.Carry out discharging (manufactured riffled tube) when cover half 19 rotates forward, thimble 14 will be at cover half 19 in design angle position location; When material toggling gear 28 rotates gear teeth, carry out the material pipe that quantitative (each) stirs material pipe 25 exits, storehouse, slip on the die cavity of oriented cover half 19 by position, school plate 7 and hyoplastron 29.

By above each operation, finish the circulation of cutting at one time processing.

By the requirement of hydraulic pressure system of processing and each mechanical work operation, the operating mode of hydraulic operating system is as follows:

1, the preparatory stage:

(1) the primer fluid press pump 21

(2) 9. the depression stroke valve is gone up stretches out button, and 3-position 4-way electro-hydraulic reversing valve control loop is 10. connected; Operation electromagnet 3DT, cut off overflow valve 4. with the path of fuel tank.At this moment, accumulator 23 beginning topping up accumulation of energys.

2, matched moulds and locked mode: operation electromagnet 6DT, closing cylinder 5 pistons move down, the beginning matched moulds; After moving, cover half closes up, operation electromagnet 8DT, pressurized cylinder (top of closing cylinder) 5 pistons move down, and to the closing cylinder supercharging, realize locked mode.

3 telescoping cylinders advance: operation electromagnet 5DT, the telescoping cylinder 10 at module two ends, 10 ' piston advance relatively.When requiring not work, piston should be in quick condition, so the solenoid directional control valve that adopts Y type meta function 6..This loop adopts adjustable joint choke valve 8. to carry out speed governing.

(above each operation, accumulator 23 all is in the topping up energy accumulating state)

4, injection cylinder injection: operation electromagnet 1DT, oil pump 21 and accumulator 23 supply pressure oil to injection cylinder 1 simultaneously, promote piston, flow out for the interior medium supercharging of injecting cavity and the high speed of front end, realize fluid injection.

5, move behind injection cylinder, the telescoping cylinder: operation electromagnet 2DT, 4DT, when moving behind the injection cylinder piston, its front end injecting cavity feed liquor.When moving behind the telescoping cylinder, realize the mechanical action of regulation.

6, die sinking:

(1), the electric current of tripping magnet 8DT, two-position four-way electro-hydraulic reversing valve resets.The pressurized cylinder release.

(2), operation electromagnet 7DT, pressure oil is opened hydraulic control one-way valve , the closing cylinder piston rises, and realizes die sinking.

In the loop check valve 3., 7., in loop separately, rise pressurize with the protection pumping action.

The fluid media (medium) of hydraulic operating system adopts machinery oil.

Claims (10)

1, a kind of method that drives cutter processing tube internal thread with fluid power, it is characterized in that comprising material pipe location, machining operation, in material pipe positioning process, the straight material pipe of intended size is sent in the die cavity of mould, through the location, matched moulds, supercharging locked mode, improve the caliber size precision; In the machining operation, earlier cutter is put into the base of tool, this cutter is the helical form cylinder, circumferential distribution screw thread, have spirality between screw thread and the screw thread vertically and cross liquid bath, the threaded end of cutter end is processed into cutting edge, the internal thread that is meshed with cutter is arranged in the base of tool, the base of tool of cutter and the material Guan Yiduan sealed attachment after the mold pressing will be housed then, the high-velocity fluid that will be produced by pressue device imports in the base of tool from the other end of the base of tool again, when fluid is crossed liquid bath by the spirality between cutter and base of tool inwall, cutter is produced the moment of momentum, force cutter to rotate by the connection thread rotary orientation in the base of tool, advance, and obtain processing preceding initial velocity and centripetal force, and entering then in the material pipe to be processed, cutter carries out machining to the material inside pipe wall under the effect of high-velocity fluid, make the material inside pipe wall form internal thread, smear metal and cutter successively flow out with the other end of fluid by the material pipe; The material pipe that unloads after the processing promptly obtains riffled tube.

2, method according to claim 1 is characterized in that the number of starts 2-3 bar of described cutter, and crossing the tangent line of liquid bath cross section centre of form trace and the space angle of cut of tool axis is 40 °-55 °, fluid media (medium) selects for use density big, the medium that kinematic viscosity is low is during the processing small-bore pipe, with mercury the best.

3, a kind of equipment that drives cutter processing tube internal thread with fluid power, form by material pipe die pressure device, cutter and the base of tool, hydraulic pressure system of processing, material pipe die pressure device comprises cover half, dynamic model and mold closing mechanism, and cover half is fixed on the frame, and dynamic model is connected on the mold closing mechanism; It is characterized in that: cutter is the helical form cylinder, circumferential distribution external screw thread, offer spirality between screw thread and the screw thread vertically and cross liquid bath, the threaded end of cutter end is processed into cutting edge, base of tool both ends open, in tool cavity is arranged, the sidewall of tool cavity has the internal thread that is meshed with cutter, cutter can screw in the tool cavity; The hydraulic pressure system of processing comprises holds the liquid case, pressue device, compression fittings, edge splice grafting head and retractor device, the fluid inlet and outlet of pressue device respectively by control valve with hold liquid case and compression fittings and communicate, edge splice grafting head by control valve with hold the liquid case and communicate, compression fittings and edge splice grafting head are fixed on the cover half both sides by retractor device, the base of tool is between compression fittings and cover half, when retractor device is done feed motion, can promote compression fittings and do relative motion with edge splice grafting head, moving behind the compression fittings promotion base of tool and the matched moulds, cover half sidewall and material pipe carry out pressing and sealing, moving behind edge splice grafting head and the matched moulds, another sidewall of cover half and material pipe carry out pressing and sealing, make the tool cavity of compression fittings by the base of tool, the material pipe is connected with edge splice grafting head, constitute hydraulic pressure processing loop, when retractor device does to shrink back action, compression fittings and edge splice grafting head are retired to both sides, and above-mentioned hydraulic pressure processing loop disconnects.

4, equipment according to claim 3, it is characterized in that described mold closing mechanism is a closing cylinder, pressue device is the booster-type injection cylinder, the import and export of its injecting cavity respectively with hold the liquid case and the plus-pressure joint communicates, retractor device is two telescoping cylinders, the hydraulic operating system control that the action of above-mentioned closing cylinder, injection cylinder, telescoping cylinder is made up of fuel tank, oil pump, control valve, connecting tube.

5, according to claim 3 or 4 described equipment, it is characterized in that the number of starts 2-3 bar of described cutter, crossing the tangent line of liquid bath cross section centre of form trace and the space angle of cut of tool axis is 40 °-55 °.

6, equipment according to claim 5, it is characterized in that described cover half is the regular polygon prism, be installed on the frame by rotating shaft, each cylinder all has material pipe die groove, and the base of tool is positioned at a side of cover half, and circumferentially is fixed on the cover half, the base of tool is provided with cutter shell chamber in the position corresponding with cover half die cavity axis, cutter is packed into by the cutter shell in the cutter shell chamber, in the cutter shell tool cavity is arranged, and the sidewall of tool cavity has the internal thread that is meshed with the cutter external screw thread.

7, equipment according to claim 6, it is characterized in that also having cutter loading and unloading device, it is by dress cutter push rod, unload the shell pull bar, connecting plate, chute, the ejection baffle plate is formed, connecting plate is enclosed within the cover half rotating shaft, and be fixed on the compression fittings, adorn the cutter push rod and unload the shell pull bar and be fixed on the connecting plate, compression fittings, dress cutter push rod and to unload the front end of shell pull bar corresponding with a cutter shell chamber respectively, adorn between the cutter push rod cutter shell chamber corresponding chute is arranged with it, the shell cutter assembly that cutter is housed can be inserted in the chute, the front end that unloads the shell pull bar is equipped with and unloads the shell hook, unloads the shell plate washer and is fixed on a side of unloading the shell pull bar between the connecting plate and the base of tool by frame.

8, equipment according to claim 7 is characterized in that between the described base of tool and the cover half spring being housed.

9, equipment according to claim 8, it is characterized in that conversion of cover half working face and location are by slide block swing-lever ratchet mechanism that is positioned at another side of cover half and thimble realization, slide block swing-lever ratchet mechanism is made up of slide block, crank rocking beam, ratchet, slide block is fixed on the dynamic model, ratchet is fixed in the cover half rotating shaft, crank rocking beam one end is connected with ratchet, and slideway is arranged on the body of rod; Thimble circumferentially is fixed on the frame, between thimble and frame spring is housed, and it is the groove of numbers such as equidistant even distribution in center and cover half cylinder that cover half side and thimble correspondence position have with the axle center, and spring is pressed into realization location in the above-mentioned groove with the top of thimble.

10, equipment according to claim 9, it is characterized in that also having feed arrangement, by material pipe storehouse, the connecting rod ratchet mechanism, the material toggling gear, position, school plate, hyoplastron is formed, the connecting rod of connecting rod ratchet mechanism and dynamic model left end face are hinged, ratchet and material toggling gear are installed in below, material Guan Cang exit position by rotating shaft, position, school plate and hyoplastron are fixed on the material pipe storehouse by bearing pin and button spring, during the dynamic model matched moulds, dynamic model high-ranking officers position plate and hyoplastron are pressed from the cover half working face, during the dynamic model die sinking, position, school plate and hyoplastron automatically reset under the effect of button spring, and position, school plate is positioned at the cover half both sides, and the distance between the plate of position, school is slightly larger than the length of material pipe, can make the material tubular axis to the location, the lower end aligned cover half die cavity of hyoplastron, material pipe position in storehouse is in the top of hyoplastron, and the gear teeth that the material toggling gear is are stretched in the outlet of feeding pipe storehouse.

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