CN109174970A - A kind of roll-forming method and device of the metal abnormity variable cross-section tubing based on hydroforming - Google Patents
A kind of roll-forming method and device of the metal abnormity variable cross-section tubing based on hydroforming Download PDFInfo
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- CN109174970A CN109174970A CN201810970982.5A CN201810970982A CN109174970A CN 109174970 A CN109174970 A CN 109174970A CN 201810970982 A CN201810970982 A CN 201810970982A CN 109174970 A CN109174970 A CN 109174970A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
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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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- Engineering & Computer Science (AREA)
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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A kind of roll-forming method and device of the metal abnormity variable cross-section tubing based on hydroforming, it is related to a kind of metal pipe material part forming technology.That there are costs of investment in order to solve existing method is high, production efficiency is low, the problems such as being also easy to produce corrugation, rupture in forming because of rubbing action.It acquires roll and determines the forming parameters in roll form process；Pipe both ends are sealed and are put into the groove of top and bottom rolls；Topping roll is depressed and is engaged with bottom roll, and applies certain mold clamping force；Fill liquid medium is carried out to tubing；Roll is rotated by predetermined angular speed, is driven tubing mobile and is formed required section feature in roll inside grooves.Utilize the supporting role of fluid pressure, metal pipe material is formed using the process of rolling, the sliding friction for changing traditional internal high pressure forming is the rolling friction of rolling mill practice, change simultaneously the direction of friction, so that friction hinders material flowing to become being conducive to material flowing, the forming quality of product is improved.
Description
Technical field
The present invention relates to the forming techniques of metal pipe material part, and in particular to it is a kind of abnormity variable cross-section tubing in filling liquid pressure
Under the conditions of roll-forming method and device.
Background technique
With the continuous improvement that contemporary aircraft requires in terms of high speed, high maneuverability energy, lightweight, longevity to component
The indexs such as life propose increasingly higher demands.Mitigate automobile simultaneously, the self weight of aircraft is to reduce energy consumption and disposal of pollutants
One of measure.Lightweight main path is using light material and light body structure.Light material include aluminium alloy, magnesium alloy,
Alloy and composite material etc. by the emperor himself.In industry manufacture, shape, the integration that becomes second nature is to obtain component optimal performance simultaneously and improve
The best-of-breed technology approach of production efficiency.There is an urgent need to largely use structural returns very significant large-scale whole for aerospace field
Complex Thin Shell, light body structure principal mode include overall structure, shell and hollow variable cross-section.It is mitigating construction weight,
Structure efficiency is improved, structural reliability is improved, organism life-span etc. is improved, has the function of that other structures are incomparable.
Currently, the forming process of special-shaped variable cross-section metallic tubular members mainly uses hydroforming technology, manage
Material is being put into internal high pressure forming mold after preforming, provides internal pressure by hydroforming equipment, surrender, which occurs, for tubing carries out
Bulging, and the order of occurrence mold in mold cavity finally obtain required pipe fitting, are formed generally by such method
Preforming work step and mold are needed, and needs dedicated internal high pressure forming equipment, therefore the preparation cost of the method is higher, and
Forming efficiency is low, and the part after forming is also easy to produce that deformation is uneven, the defects of bursting, extremely wrinkling, and reduces the quality of product piece.
It needs one kind that can effectively provide special-shaped variable cross-section metal pipe material forming efficiency at present, reduces its production cost, and
The opposite method for improving its forming quality, to solve to ask present in forming of the internal high pressure forming technique for this type pipe fitting
Topic.
Summary of the invention
The present invention is to solve preparation cost present in the internal high pressure forming technique of existing special-shaped variable cross-section metal tube
Higher, and forming efficiency is low, the part after forming is also easy to produce that deformation is uneven, the problems such as bursting, extremely wrinkling, and proposes one kind and is based on
The roll-forming method and device of the metal abnormity variable cross-section tubing of hydroforming.
The technical solution adopted by the present invention to solve the above technical problem is:
A kind of roll-forming method of the metal abnormity variable cross-section tubing based on hydroforming, this method are real according to the following steps
It applies:
Step 1: carrying out reverse according to preform tubing (pipe fitting) each cross sectional shape to obtain variable cross-section or non-become and cut
The roll in face and processing；The both ends design of the preform tubing has (a small amount of) transition circle section；
Step 2: determine roll form process in forming parameters, including roll drafts, forming tubular product internal pressure,
Roll rotation angular speed；
Step 3: pipe both ends to be formed are sealed, and go out to access liquid-filling pipe in seal head；
Step 4: pipe end to be formed is put into the groove of top and bottom rolls；
Step 5: starting rolling mill assembly, topping roll is depressed and is engaged with bottom roll, and applies certain mold clamping force；
Step 6: carrying out filling liquid pressure to tubing, filling liquid internal pressure should be lower than tubing yield strength；
Step 7: roll is rotated by predetermined angular speed, needed for driving tubing mobile and being formed in roll inside grooves
The section feature wanted；
Forming process of the tubing described in step 7 in roll groove is compression moulding, rather than common interior high pressure
Bulging, filling liquid are pressed in the overall process of compression moulding, and the perimeter of pipe cross section does not change or is slightly reduced substantially.
The method also includes step 8: every one turn of the progress of roll just shapes one section and gradually becomes from both ends to depression in centre
Big variable cross-section pipe fitting, this section of pipe fitting are sent to progress fly-cutting in Cutting platform by roll and obtain single pipe fitting, and pipe fitting is raw
After production, rolling mill assembly is closed.
Step 8 may also is that roll carries out continuous rotation and shapes the identical variable cross-section pipe fitting of recess, then according to need
It to be sent to progress fly-cutting in Cutting platform by roll and obtains single pipe fitting, after pipe fitting produces, closes rolling mill assembly.
Required forming internal pressure is less than the yield strength of tubing in tube rolling forming process described in step 2, is
The 30~40% of tubing yield strength；Roll rotation angular speed be (0, π/6].It so can guarantee the minimum pressure that forming needs,
It also can be reduced energy consumption.
In step 3, seal head is movable sealing form, and accesses liquid-filling pipe in seal head and fill to tubing
Hydraulic, seal head can carry out free movement with tubing movement.Tubing encapsulating method is different from traditional internal high pressure forming and is used
Formed punch head into sealing, the present invention uses movable sealing mode, be seal head can be mobile with tubing and carry out free movement.
In step 7, with fluted for placing tubing on the roller, the radial cross-sectional shape of groove passes through to tubing
Design section carry out reverse and obtain, roll for forming workspace, that is, groove radial cross-sectional shape along roll it is circumferential not
It is disconnected to change, and corresponded with the distribution of the transversal cross-section of tubing in the axial direction.
Roll perimeter described in step 8 is consistent with the design length of forming tube, and only in end, there are more than the cutting of part
Amount, i.e., roll rotates a circle in the operating condition, and tubing is shaped in roll workspace inside grooves, and has roll brought forward,
Shape a complete special-shaped variable cross-section tubing.
The roll former of the present invention also provides a kind of metal abnormity variable cross-section tubing based on hydroforming, the dress
Set includes: closed loop servo-control system, booster, mechanical transmission mechanism, screwdown gear, top mold holder, guide post, seal head, feeding
Platform, pedestal, a pair roller, fixture, cutting machine and Cutting platform；Screwdown gear, top mold holder, guide post, pedestal and a pair roller
Constitute milling train；
Top mold holder is located above pedestal and a pair roller is positioned there between, and top mold holder can be along the guide post being mounted on the base
It moves up and down, screwdown gear is arranged in top mold holder, and the outer surface of topping roll, bottom roll in a pair roller is along the circumferential direction set
There is annular groove, topping roll, each Cross Section Morphology of annular groove of bottom roll and each cross sectional shape of preform tubing coincide；Topping roll, bottom roll
The type chamber formed after pairing for tubing for passing through, and end of the seal head for tubing is sealed, and material conveying platform is located at milling train
It is rolled into side, height can be adjusted, and keep tubing axle center height consistent with work roll groove axle center height；Cutting platform is located at
Milling train shuts out side, and the two sides of Cutting platform have fixture, after a complete forming tubular product is shut out, roll stop motion, by pressing from both sides
After tubing is fixed in tool, it is cut by cutting machine；Closed loop servo-control system by mechanical transmission mechanism come
Top mold holder movement is controlled, booster is for pressurizeing to the filling liquid in tubing.
Further, the annular groove section of the topping roll of the roll former is variation, and the annular groove of topping roll includes
The initial segment, two changeover portions and whole shaped segment；The both ends that the both ends of the initial segment respectively pass through a changeover portion and whole shaped segment are formed
One annular groove, the annular groove section of the initial segment are the semicircle that diameter is equal to pipe bad outer diameter, the annular groove section of whole shaped segment in advance at
Shape tubing section matches；The annular groove section of the bottom roll is the semicircle that diameter is equal to pipe bad outer diameter.
The corresponding center of circle degree of the initial segment is chosen as 30 to 35 degree, and the corresponding central angle of each changeover portion is chosen as 40 to 45
Degree.
Topping roll, the annular groove shape of bottom roll are identical, match with preform tubing section.
The beneficial effects of the present invention are:
The present invention solves the existing special-shaped variable cross-section pipe fitting manufacturing process using internal high pressure forming, and there are equipment and moulds
Has the defects of cost of investment is high, production efficiency is low, is also easy to produce corrugation, rupture in forming because of rubbing action, this method utilizes liquid
The supporting role of body pressure is formed metal pipe material using the process of rolling, changes the cunning of traditional internal high pressure forming
Dynamic friction is the rolling friction of rolling mill practice, changes simultaneously the direction of friction, so that friction hinders material flowing to become being conducive to
Material flowing, be effectively reduced friction inhibition influence, improve material flowing, improve product forming quality, simultaneously effectively
Production efficiency is improved, the investment of equipment and mold is reduced, reduces production cost.
Specific advantage shows the following aspects:
1. the dedicated unit of hydroforming used by internal high pressure forming technique is relatively expensive, and past need is gone in forming
It carries out preforming, it is therefore desirable to a set of preforming tool be fabricated separately, therefore in such special-shaped variable cross-section tubing use
The higher cost that high-pressure forming technique is formed, and relatively conventional and valence in duo mill industrial circle used in the present invention
Lattice are reasonable, it is only necessary to supercharging device component required for Hydroform process, therefore the warp of the method are combined on original device
Better results for Ji, can effectively reduce the manufacturing cost about 10~20% of special-shaped variable cross-section metal tube.
Hydraulic forming method is generally not used to forming variable cross-section tubing, because internal pressure cannot unanimously change, and roll forming
Generally be directed to bar rather than it is directed to bank metal pipe material.Hydroforming and roll forming are combined together by the present invention.
2. intraluminal fluid pressure is often higher than the yield strength of tubing during internal high pressure forming, make tubing that bulging occur, this
A process can be such that tube wall thickness is thinned relatively, and imperfect flow has occurred for material, generate unnecessary defect, and this method uses
The compression moulding of filling liquid pressure, the internal pressure of tubing are less than the yield strength of tubing, and the thickness of tubing does not change or slightly substantially
It thickens, so that material flowing is uniformly, it is hydraulic that certain rigidity can be provided for tubing, make it that circumferential corrugation not occur, and be pressed into
Tubing is in three-dimensional compressive stress state during shape, and conditions above can greatly reduce tube-forming processes and generate becoming for defect
Gesture, to effectively improve the quality of production qualification rate and single-piece, and due to the mechanics feature of rolling, the tubing after forming will be in axis
Possess better mechanical property on line direction.
3. the present invention uses the roll-forming method based on conventional hydraulic forming technique for special-shaped variable cross-section metal tube, roll
It is a complete finished parts that roller, which rotates a circle and shuts out the tubing of part, need to only be cut on Cutting platform, because
This method and device disposably can quickly produce multiple tubing element, and according to the lateral dimension of milling train and roll, can be in roll
It is laterally homogeneous be furnished with 2~3 forming pockets, it can be achieved that simultaneously produce 2~3 root canal parts, can be improved forming efficiency 50~70% with
On, reduce forming work step and period.
4. tubing internal pressure is higher than its yield strength, and mold is bonded completely with tubing, bulging during internal high pressure forming
Contact area is larger in the process, therefore mold receives very big forming counter-force, interior in order to guarantee that mold and the pressure of tubing are stablized
High-pressure forming device needs to apply biggish mold clamping force to mold, and the forming of tubing uses being pressed into for filling liquid pressure in the present invention
Shape, the internal pressure of tubing is less than the yield strength of tubing, and contact of the tubing with roll is almost that line contacts, and formation zone is only roll
Intermediate groove portion does not need very big mold clamping force in forming process, reduces tonnage and the energy consumption of former, milling train used
Equipment tonnage is 100~200t.
It is pipe by controlling the angular speed of top and bottom rolls 5. the present invention can also shape the swan-neck of larger radius of curvature
Material is bent to the slower side of angular speed, if but radius of curvature it is too small, it may occur that curved interior wrinkle behavior, therefore control
Radius of curvature is in 200mm or more.
6. the present invention hardly happens stopping in forming process, technological parameter is constant, it can be achieved that special-shaped variable cross-section metal
The continuous batch of pipe produces, and process continuity is preferable.
7. tubing used in the present invention is only in the circular section changeover portion of end, there are parts to cut surplus, and cuts surplus
Control is used for subsequent tubing cutting section within 10mm, and rest part tubing is used to shape, and stock utilization is higher.
8. if not changing with axial length, the present invention can the axial cross section of odd-shaped cross section pipe fitting formed thereby is constant
The constant cross-section pipe fitting of once-forming random length out, and forming rolls is replaceable, craft flexibility is good.
Detailed description of the invention
Fig. 1 is a kind of general assembly of the roll former of special-shaped variable cross-section tubing based on Hydroforming of the invention
Figure,
Wherein: 1- closed loop servo-control system operation bench, 2- booster, 3- mill drive mechanism, 4- screwdown gear, on 5-
Mould bases, 6- guide post, 7- pipe fitting, 8- seal head, 9- material conveying platform, 10- pedestal, 11- roll, 12- fixture, 13- cutting machine, 14-
Cutting platform；
Fig. 2 is characteristic lateral section schematic diagram of the special-shaped variable cross-section pipe fitting along axial each position；
Fig. 3 is the schematic three dimensional views with variable cross-section groove roll, and the pattern of further groove is opposite with pipe fitting shown in figure one
It answers, by being obtained to its reverse；A is topping roll schematic three dimensional views, and b is bottom roll schematic three dimensional views；
Fig. 4 is radial cross section of the topping roll along the circumferential each angle of roll；
Fig. 5 is that (special-shaped variable cross-section metal tube shaped for the two-dimensional surface schematic diagram of special-shaped variable cross-section metal tube forming process
Journey schematic diagram)；
Fig. 6 is the schematic diagram of movable sealer.
Specific embodiment:
The present invention will be further explained below with reference to examples.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.Below with reference to embodiment, the present invention will be described in detail.
In order to enable those skilled in the art to better understand the solution of the present invention, right below in conjunction with the embodiment of the present invention
Technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention one
Partial embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, should fall within the scope of the present invention.
Pipe material used in this embodiment is DP dual phase steel, and strain hardening exponent n is 0.06, average elongation
δ is 19.1%, yield strength σs796Mpa, tensile strength sigmabThe transversal cross-section shape and crescent of tubing after 865Mpa forming
Approximation, single pipe length 500mm, tubing original diameter are 88mm, and tubing thickness t is 2mm, as shown in Figure 2.
This method is implemented according to the following steps:
Step 1: carrying out reverse according to forming each cross sectional shape of pipe fitting to obtain roll and the processing of variable cross-section, pipe fitting
Cross sectional shape as shown in Fig. 2, the obtained roll feature of reverse as shown in Fig. 3 and Fig. 4；
Step 2: determine roll form process in forming parameters, including roll drafts, forming tubular product internal pressure,
Roll rotation angular speed etc., in the present embodiment, internal pressure needed for forming tubular product is by formula pr/t=σsIt determines, wherein t
For pipe fitting thickness, r is tubing green diameter, obtains pipe fitting when tubing internal pressure is 35Mpa and surrenders, therefore forming of the invention
Internal pressure should be less than this value, will increase the frictional force between tubing and roll when internal pressure is excessive, be pipe fitting can not mold, and interior press through
Small, the defects of generating corrugation, obtains most preferably shaping internal pressure being 13Mpa, far smaller than surrender internal pressure through finite element modelling
35Mpa, and the rotational angular velocity of roll is 1/6 π rad/S；
Step 3: pipe both ends to be formed are sealed, as shown in Figure 6；
Step 4: pipe end to be formed is put into the groove of top and bottom rolls；
Step 5: starting rolling mill assembly, topping roll is depressed and is engaged with bottom roll, and applies certain mold clamping force,
As shown in Figure 1；
Step 6: carrying out filling liquid pressure to tubing, filling liquid internal pressure should be lower than tubing yield strength；
Step 7: roll is rotated by predetermined angular speed, needed for driving tubing mobile and being formed in roll inside grooves
The section feature wanted, as shown in Figure 5；
Step 8: every one turn of the progress of roll just shapes a root canal part, pipe fitting is sent in Cutting platform by roll and carries out
Fly-cutting obtains single pipe fitting, after pipe fitting produces, closes rolling mill assembly.
Transition circle section can also provide certain surplus for cutting, and cutting surplus is 8mm in the present embodiment.
Tubing encapsulating method described in step 3 is different from formed punch used by traditional internal high pressure forming and heads into sealing, the present invention
It is that seal head can carry out free movement with tubing movement, as shown in Figure 6 using movable sealing mode.
The surrender that required forming internal pressure is generally less than tubing in tube rolling forming process described in step 2 is strong
It spends, in the present embodiment, obtains most preferably shaping internal pressure being 13Mpa through finite element modelling, far smaller than surrender internal pressure 35Mpa.
Forming process of the tubing described in step 7 in roll groove is compression moulding, rather than common interior high pressure
Bulging, filling liquid are pressed in the overall process of compression moulding, and the perimeter of pipe cross section does not change or is slightly reduced, this implementation substantially
In example, within the circumferential compacting rate 7% of tubing.
Working roll band described in step 7 is fluted for placing tubing, and the radial cross-sectional shape of groove passes through to tubing
Design section carry out reverse and obtain, roll for forming workspace, that is, groove radial cross-sectional shape along roll it is circumferential not
It is disconnected to change, and corresponded with the distribution of the transversal cross-section of tubing in the axial direction, as shown in Figure 3,4.
The design length of roll perimeter and forming tube described in step 8 is almost the same, and only in end, there are partially cut
Surplus is cut, i.e. roll rotates a circle in the operating condition, and tubing is shaped in roll workspace inside grooves, and has roll band forward
It is dynamic, shape a complete special-shaped variable cross-section tubing.
This implementation the method is realized using following device: a kind of metal abnormity variable cross-section tubing based on hydroforming
Roll former, described device include: closed loop servo-control system, booster, mechanical transmission mechanism, screwdown gear, on
Mould bases, guide post, seal head, material conveying platform, pedestal, a pair roller, fixture, cutting machine and Cutting platform；Screwdown gear, upper mold
Frame, guide post, pedestal and a pair roller constitute milling train；Top mold holder is located above pedestal and a pair roller is positioned there between, upper mold
Frame can be moved up and down along the guide post being mounted on the base, and screwdown gear is arranged in top mold holder, topping roll in a pair roller, under
The outer surface of roll is along the circumferential direction equipped with annular groove, topping roll, each Cross Section Morphology of annular groove of bottom roll and each section of preform tubing
Face shape is coincide；The type chamber formed after topping roll, bottom roll pairing for passing through for tubing, seal head for tubing end into
Row sealing, material conveying platform are located at milling train and are rolled into side, and height can be adjusted, and make tubing axle center height and work roll groove axis
Heart height is consistent；Cutting platform is located at milling train and shuts out side, and the two sides of Cutting platform have fixture, when a complete forming tubular product rolls
After out, roll stop motion after tubing is fixed by fixture, is cut it by cutting machine；Close loop servo control
System controls top mold holder movement by mechanical transmission mechanism, and booster is for pressurizeing to the filling liquid in tubing.
Topping roll, bottom roll are detachable work rolls.Material conveying platform position milling train is rolled into side, and height can be adjusted
Section, is that tubing axle center height is consistent with work roll groove axle center height.Cutting platform is located at milling train and shuts out side, and two sides are with folder
Tool, after a complete forming tubular product is shut out, roll stop motion, after tubing is fixed by fixture, cutting machine to its into
Row cutting.Seal head is movable sealing form, and accesses liquid-filling pipe in seal head and carry out filling liquid pressure to tubing.
Further, the annular groove section of the topping roll of the roll former is variation, and the annular groove of topping roll includes
The initial segment, two changeover portions and whole shaped segment；The both ends that the both ends of the initial segment respectively pass through a changeover portion and whole shaped segment are formed
One annular groove, the annular groove section of the initial segment are the semicircle that diameter is equal to pipe bad outer diameter, the annular groove section of whole shaped segment in advance at
Shape tubing section matches；The annular groove section of the bottom roll is the semicircle that diameter is equal to pipe bad outer diameter.
The corresponding center of circle degree of the initial segment is chosen as 30 to 35 degree, and the corresponding central angle of each changeover portion is chosen as 40 to 45
Degree.
Topping roll, the annular groove shape of bottom roll are identical, match with preform tubing section.
Claims (10)
1. a kind of roll-forming method of the metal abnormity variable cross-section tubing based on hydroforming, it is characterised in that: this method is pressed
Following steps are implemented:
Step 1: carrying out reverse according to each cross sectional shape of preform tubing to obtain the roll of variable cross-section or non-variable cross-section simultaneously
Processing；The both ends design of the preform tubing has transition circle section；
Step 2: determining the forming parameters in roll form process, including roll drafts, forming tubular product internal pressure, roll
Rotational angular velocity；
Step 3: pipe both ends to be formed are sealed, and go out to access liquid-filling pipe in seal head；
Step 4: pipe end to be formed is put into the groove of top and bottom rolls；
Step 5: starting rolling mill assembly, topping roll is depressed and is engaged with bottom roll, and applies certain mold clamping force；
Step 6: carrying out filling liquid pressure to tubing, filling liquid internal pressure should be lower than tubing yield strength；
Step 7: roll is rotated by predetermined angular speed, required for driving tubing mobile and being formed in roll inside grooves
Section feature.
2. a kind of roll-forming method of metal abnormity variable cross-section tubing based on hydroforming according to claim 1,
The method also includes step 8: every one turn of the progress of roll just shapes the change that one section becomes larger from both ends to depression in centre and cuts
Facial canal part, this section of pipe fitting is sent to progress fly-cutting in Cutting platform by roll and obtains single pipe fitting, after pipe fitting produces,
Close rolling mill assembly.
3. a kind of roll-forming method of metal abnormity variable cross-section tubing based on hydroforming according to claim 1,
The method also includes step 8: roll carries out continuous rotation and shapes the identical variable cross-section pipe fitting of recess, then as needed
Progress fly-cutting in Cutting platform is sent to by roll and obtains single pipe fitting, after pipe fitting produces, closes rolling mill assembly.
4. a kind of roll-forming method of metal abnormity variable cross-section tubing based on hydroforming according to claim 1,
It is characterized by: the surrender that required forming internal pressure is less than tubing in tube rolling forming process described in step 2 is strong
Degree, is the 30~40% of tubing yield strength；Roll rotation angular speed be (0, π/6].
5. a kind of roll-forming method of metal abnormity variable cross-section tubing based on hydroforming according to claim 1,
It is characterized by: seal head is movable sealing form in step 3, and liquid-filling pipe is accessed in seal head, tubing is carried out
Filling liquid pressure, seal head can carry out free movement with tubing movement.
6. a kind of roll forming side of metal abnormity variable cross-section tubing based on hydroforming according to claim 1 or 2
Method, it is characterised in that:
In step 7, with fluted for placing tubing on the roller, the radial cross-sectional shape of groove is by setting tubing
Meter section carries out reverse and obtains, circumferential direction constantly hair of workspace, that is, groove radial cross-sectional shape of the roll for shaping along roll
Changing, and corresponded with the distribution of the transversal cross-section of tubing in the axial direction.
7. a kind of roll-forming method of metal abnormity variable cross-section tubing based on hydroforming according to claim 2,
It is characterized by: roll perimeter described in step 8 is consistent with the design length of forming tube, only in end, there are partially cut
Surplus is cut, i.e. roll rotates a circle in the operating condition, and tubing is shaped in roll workspace inside grooves, and has roll band forward
It is dynamic, shape a complete special-shaped variable cross-section tubing.
8. a kind of roll former of the metal abnormity variable cross-section tubing based on hydroforming, described device includes: that closed loop is watched
Take control system (1), booster (2), mechanical transmission mechanism (3), screwdown gear (4), top mold holder (5), guide post (6), seal head
(8), material conveying platform (9), pedestal (10), a pair roller (11), fixture (12), cutting machine (13) and Cutting platform (14)；Pressure
Device (4), top mold holder (5), guide post (6), pedestal (10) and a pair roller (11) constitute milling train；
Top mold holder (5) is located above pedestal (10) and a pair roller (11) is positioned there between, and top mold holder (5) can be along being mounted on bottom
Seat (10) on guide post (6) move up and down, screwdown gear (4) be arranged on top mold holder (5), in a pair roller (11) on roll
Roller, bottom roll outer surface be along the circumferential direction equipped with annular groove, each Cross Section Morphology of annular groove and preform tubing of topping roll, bottom roll
Each cross sectional shape coincide；The type chamber formed after topping roll, bottom roll pairing for tubing (7) for passing through, and seal head (8) is for managing
The end of material (7) is sealed, and material conveying platform (9) is located at milling train and is rolled into side, and height can be adjusted, and makes tubing axle center height
It is consistent with work roll groove axle center height；Cutting platform (14) is located at milling train and shuts out side, and the two sides of Cutting platform (14) have
Fixture (12), after a complete forming tubular product is shut out, roll stop motion, after tubing is fixed by fixture, by cutting
Cutting mill (13) cuts it；It is dynamic that closed loop servo-control system (1) controls top mold holder (5) by mechanical transmission mechanism (3)
Make, booster (2) is for pressurizeing to the filling liquid in tubing (7).
9. a kind of roll former of metal abnormity variable cross-section tubing based on hydroforming according to claim 8,
It is characterized in that, the annular groove section of the topping roll is variation, the annular groove of topping roll includes the initial segment, two changeover portions and end
Shaped segment；The both ends of the initial segment respectively pass through a changeover portion and the both ends of whole shaped segment form an annular groove, the annular groove of the initial segment
Section is the semicircle that diameter is equal to pipe bad outer diameter, and the annular groove section of whole shaped segment matches with preform tubing section；It is described
The annular groove section of bottom roll is the semicircle that diameter is equal to pipe bad outer diameter.
10. a kind of roll former of metal abnormity variable cross-section tubing based on hydroforming according to claim 8,
It is characterized in that, the annular groove shape of topping roll, bottom roll is identical, match with preform tubing section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810970982.5A CN109174970B (en) | 2018-08-22 | 2018-08-22 | Method and device for rolling and forming metal special-shaped pipe based on hydraulic forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810970982.5A CN109174970B (en) | 2018-08-22 | 2018-08-22 | Method and device for rolling and forming metal special-shaped pipe based on hydraulic forming |
Publications (2)
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| CN111389951A (en) * | 2020-03-26 | 2020-07-10 | 燕山大学 | Tubular product rolls bloated forming hydraulic press |
| CN111390006A (en) * | 2020-04-01 | 2020-07-10 | 哈尔滨工大海卓智能成形科技有限公司 | Liquid-filled rolling forming device and method |
| CN113102598A (en) * | 2021-04-09 | 2021-07-13 | 哈尔滨工业大学 | Liquid-filling pressing forming device and method for special-shaped section pipe fitting |
| CN114669650A (en) * | 2021-12-21 | 2022-06-28 | 倍力汽车轻量化科技(潍坊)有限公司 | Expansion forming process for driving axle housing |
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| CN114669650A (en) * | 2021-12-21 | 2022-06-28 | 倍力汽车轻量化科技(潍坊)有限公司 | Expansion forming process for driving axle housing |
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