CN107052175B - A kind of titanium or titanium alloy picks expansion-molding core model processed - Google Patents
A kind of titanium or titanium alloy picks expansion-molding core model processed Download PDFInfo
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- CN107052175B CN107052175B CN201710291128.1A CN201710291128A CN107052175B CN 107052175 B CN107052175 B CN 107052175B CN 201710291128 A CN201710291128 A CN 201710291128A CN 107052175 B CN107052175 B CN 107052175B
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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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/08—Tube expanders
- B21D39/20—Tube expanders with mandrels, e.g. expandable
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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a kind of titanium or titanium alloy to pick expansion-molding core model processed, including the core model ontology that outer wall is smooth, the core model ontology is connected in sequence by section of extending, expanding deformation section and sizing section, the central axes of the section of extending, expanding deformation section and sizing section are overlapped, the junction of extend section and the expanding deformation section is provided with First Transition circular arc, the junction of the expanding deformation section and sizing section is provided with the second transition arc, the end of the sizing section is provided with circular arc chamfering, and the taper angle extended between section and expanding deformation section is 10 °~30 °.The present invention has suitable expanding deformation taper and core model shape, can make the expanding deformation of pipe under conditions of guaranteeing that pushing power is unaffected uniformly, significantly reduce wall unevenness even ground degree, improve tubing circularity and improve pipe material inner wall finish.
Description
Technical field
The present invention relates to a kind of expansion-molding core models, and in particular to a kind of titanium or titanium alloy picks expansion-molding core processed
Mould.
Background technique
Large-bore titanium alloy tubing can be divided into seamed pipe and seamless pipe, and seam tubes are using sheet metal metal plate as former
Material by punching press and curls into that one cylindric or two semicircular arc-shaped, then using being welded into longitudinal weldering
The welded tube of seam.Roll piercing+rolling, extruding+rolling or single roll piercing, pressing method system can be used in titanium alloy seamless pipe
For at titanium alloy seamless pipe.For roll piercing+rolling, extruding+rolling preparation titanium alloy pipe, due to by rolling equipment
The limitation of rolling power and size can only generally process the titanium alloy pipe that diameter is less than 110mm.Using roll piercing, squeeze
Method is prepared into titanium alloy seamless pipe, and size can be more than 110mm or more, especially roll piercing prepare tubing be suitable for processing it is large quantities of
The titanium alloy seamless pipe of amount, radius-thickness ratio=0.1 or so, pressing method can produce large-scale titanium alloy seamless pipe, but set with extruding
Standby ability, mold are related, and the cost for squeezing titanium alloy pipe is relatively high, are the 3~6 of roll piercing processing tubing expense
Times.
The characteristics of thermal expansion titanium alloy pipe is that pipe covers on being arranged successively core bar, and core bar is locked in the racks such as fixed memorial archway
On, core bar front end welds expanding deformation expansion-molding core model, movable memorial archway in pushing expanding procedure and pushes pushing ring, pushing pipe
Advanced with pipe along core bar with certain speed, electromagnetic induction heating coil and expansion-molding core model are fixed mode, electromagnetism sense
It answers heating coil heating expansion-molding core model and sequentially enters the pipe in heating coil, titanium alloy tube passes through expansion-molding core model
The expanding deformation section of taper is expanding to arrive required outer diameter, then reaches the final of titanium alloy tube at large-diameter pipe through sizing section sizing school circle
Diameter dimension.The deformation that continuous circumferential direction is expanding, is compressed axially occurs at expansion-molding core model for pipe.
For the large-bore titanium alloy tubing of small lot, existing seamless pipe, seamed pipe can be used using expansion-molding side
Method preparation, and expansion-molding core model is the key that expander in expansion-molding method, for expander evenness of wall thickness, tubing circularity,
Quality control on the surface plays the role of vital.
For titanium alloy, the elevated temperature strength of titanium alloy is high, elevated temperature strength variation with temperature and generate great changes,
That is the high temperature sensitivity of titanium alloy is strong, and process window is small.And the physical property coefficient of heat conduction of titanium alloy is small, causes thermal conductivity
Difference, when hot-working, are easy tacky, and internal surface of pipe is easy to produce scuffing, influences the inner surface quality of tubing.And titanium alloy heat
Melt small, magnetic conductivity is low, when heating of pipe blank, is easy to produce that blank temperature is uneven, non-uniform temperature directly will affect the wall of tubing
Thick uniformity, moreover, pipe uses electromagnetic induction heating, due to the effect of kelvin effect, the thinner position heating of pipe wall thickness
Temperature is higher, the great deterioration of the inhomogeneities of wall thickness.Titanium alloy elastic modulus is low, and elastic property is good, the circularity control of pipe end
Make it is relatively difficult, therefore, titanium alloy pushing expander with molding core model design should be noted many detailed problems.
In pushing formula expander technique, picking expansion-molding processed with deformation taper expanding in core model is to determine product wall thickness essence
When degree and an important factor for uniformity, expanding deformation taper are too big, the expanding deflection of tubing is larger in pushing expanding procedure, institute
Need pushing power larger, capacity of equipment requires height, moreover, drastic deformation occurs for tubing, the even degree of wall unevenness increases；And excessively subtract
Small expanding deformation taper, the expanding deformation of tubing is uniform, but causes conical surface length too long, and expander processing efficiency reduces, expanding prick
The contact area of face and blank inside pipe wall increases, and increases inside pipe with the frictional force of the conical surface, causes tubing interior surface quality
It is deteriorated.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of titanium and titanium closes
Gold picks expansion-molding core model processed.The core model has suitable expanding deformation taper and core model shape, can guarantee pushing power
Under conditions of unaffected, make the expanding deformation of pipe uniformly, significantly reduce wall unevenness even ground degree, guarantee tubing circularity and mention
High pipe material inner wall finish.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of titanium or titanium alloy pick expander processed at
Type core model, which is characterized in that including the core model ontology that outer wall is smooth, the core model ontology by section of extending, expanding deformation section and
Sizing section is connected in sequence, and the central axes of the section of extending, expanding deformation section and sizing section are overlapped, the section and expanding of extending
The junction of deformation section is provided with First Transition circular arc, and the junction of the expanding deformation section and sizing section is provided with the second transition
Circular arc, the end of the sizing section are provided with circular arc chamfering, and the taper angle extended between section and expanding deformation section is 10 °~
30°。
A kind of above-mentioned titanium or titanium alloy picks expansion-molding core model processed, which is characterized in that when the core model is for pure
When titanium picks expansion-molding processed, the taper angle extended between section and expanding deformation section is 16 °~30 °；When the core model is used
When diphasic titanium alloy or beta titanium alloy pick expansion-molding processed, the taper angle extended between section and expanding deformation section is
10 °~20 °.
A kind of above-mentioned titanium or titanium alloy picks expansion-molding core model processed, which is characterized in that the First Transition circular arc
Radius be 2 times~8 times of sizing section diameter.
A kind of above-mentioned titanium or titanium alloy picks expansion-molding core model processed, which is characterized in that second transition arc
Radius be 0.2 times~1.5 times of sizing section diameter.
A kind of above-mentioned titanium or titanium alloy picks expansion-molding core model processed, which is characterized in that the half of the circular arc chamfering
Diameter is 1mm~10mm.
A kind of above-mentioned titanium or titanium alloy picks expansion-molding core model processed, which is characterized in that the length of the sizing section
It is 0.1 times~0.4 times of the diameter of sizing section.
Compared with the prior art, the present invention has the following advantages:
1, titanium alloy of the present invention picks expansion-molding core model processed from front to back successively by section of extending, expanding deformation section and fixed
Diameter section connection composition, three, which is successively linked up, forms the coaxial single piece that an outer wall smoothly transits, section of extending and expanding deformation section
Between taper angle be 10 °~30 °, and extend between section and expanding deformation section through First Transition arc smooth transition, expand
By the second transition arc rounding off between diameter deformation section and sizing section, sizing section end is circular arc chamfering radius.
2, the present invention with mold core print is practically applicable to pushing method of expanding due to expansion-molding, expansion-molding mold core print with push away
The connection of coremaking bar, core bar diameter is identical as the diameter of the initial end for section of extending, and using being welded together, when welding guarantees core
Bar keeps coaxial with core model.Expanding deformation section cone angle size is related with the elevated temperature strength of pushing material, for pure titanium, intensity
Intensity compared with diphasic titanium alloy and beta-titanium alloy is low, and the taper angle of expanding deformation section is 16 °~30 °, for diphasic titanium alloy and
Beta-titanium alloy, the taper of expanding deformation section are 10 °~20 °.In order to guarantee expanding continuity and uniformity, section of extending and expansion
The rounding off radius of diameter deformation section is 2 times~8 times of sizing section diameter.It is fixed in order to guarantee the circularity of the expanding tubing of titanium alloy
The sizing segment length of diameter Length Ratio steel tubing core model is long, is 0.1 times~0.4 times of the diameter of sizing section.In order to guarantee tubing
With the close stickup of core model, tubing nose is prevented, arc transition, rounding off half are carried out between expanding deformation section and sizing section
Diameter is 0.2~1.5 times of pipe diameter.To reduce the frictional force between core model and titanium alloy tube blank inner wall, prevent from scraping when pushing
Hurt titanium alloy inner wall, guarantee pipe material inner wall finish, the circular arc chamfering radius of sizing section end is 1~10mm.
3, core model of the invention is designed and is tested according to numerical simulation of optimum, selects suitable expanding deformation taper, can be
Tube wall thickness unevenly equal deterioration degrees are significantly reduced under conditions of guarantee pushing power is unaffected, make deformation more evenly.And
In order to guarantee the continuity of expanding deformation, smoothly transit extending to use between section and expanding deformation section, while in order to guarantee titanium
And the length of sizing section can be appropriately extended for steel pipe in the circularity of titanium alloy tube, especially in the end of sizing section using round and smooth
Chamfering makes core model, from sharply cunning is rounded, can reduce rubbing between core model and titanium alloy tube blank inner wall with the contact of blank inside pipe wall
Power is wiped, prevents from scratching titanium alloy inner wall when pushing, guarantees pipe material inner wall finish again.
4, picked in expansion-molding technique processed using core model of the invention for titanium or titanium alloy, required pushing power compared with
Small, capacity of equipment requirement is lower, and improves expander processing efficiency, and the yield rate of product greatly improves, and meets industrial metaplasia
The needs of production.
Below by drawings and examples, the present invention is described in further detail.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Description of symbols:
1-extends section；2-expanding deformation sections；3-sizing sections.
Specific embodiment
Embodiment 1
A kind of pure titanium as shown in Figure 1 picks expansion-molding core model processed, including the core model ontology that outer wall is smooth, the core
Mould body is connected in sequence by section 1 of extending, expanding deformation section 2 and sizing section 3, the section 1 of extending, expanding deformation section 2 and fixed
The central axes of diameter section 3 are overlapped, and the junction of extend section 1 and the expanding deformation section 2 is provided with First Transition circular arc, described expanding
The junction of deformation section 2 and sizing section 3 is provided with the second transition arc, and the end of the sizing section 3 is provided with circular arc chamfering, institute
Stating the taper angle extended between section 1 and expanding deformation section 2 is 20 °.
In the present embodiment, the radius R1 of the First Transition circular arc is 5 times of 3 diameter of sizing section.
In the present embodiment, the radius R2 of second transition arc is 0.5 times of 3 diameter of sizing section.
In the present embodiment, the radius R3 of the circular arc chamfering is 6mm.
In the present embodiment, the length of the sizing section 3 is 0.3 times of the diameter of sizing section 3.
Embodiment 2
The present embodiment difference from example 1 is that: the taper angle extended between section 1 and expanding deformation section 2
It is 22 °；The radius R1 of the First Transition circular arc is 8 times of 3 diameter of sizing section；The radius R2 of second transition arc is fixed
0.3 times of 3 diameter of diameter section；The radius R3 of the circular arc chamfering is 5mm；The length of the sizing section 3 is the diameter of sizing section 3
0.1 times.
In the present embodiment, the connection relationship and installation site of rest part are same as Example 1.
Embodiment 3
The present embodiment difference from example 1 is that: the taper angle extended between section 1 and expanding deformation section 2
It is 30 °；The radius R1 of the First Transition circular arc is 2 times of 3 diameter of sizing section；The radius R2 of second transition arc is fixed
0.2 times of 3 diameter of diameter section；The radius R3 of the circular arc chamfering is 3mm；The length of the sizing section 3 is the diameter of sizing section 3
0.25 times.
In the present embodiment, the connection relationship and installation site of rest part are same as Example 1.
The step of core model of 1~embodiment of embodiment 3 picks expansion-molding processed for pure titanium are as follows:
Step 1: the core print of core model is connect with pushing core bar, core bar diameter is identical as the diameter of the initial end for section of extending, and adopts
With being welded together, when welding, guarantees that the core model of core bar and the present embodiment is coaxial；
Step 2: pure titanium base inner and outer wall brushing antioxidant coating, then in the inner wall of pure titanium tube base and the table of core model
Face brushing lubricant MoS2Coating, pipe cover on being arranged successively core bar, and core bar is locked in the racks such as fixed memorial archway, electromagnetism sense
Heating coil is answered to be looped around around core model, movable memorial archway pushes pushing ring, pushing pipe and pipe along core bar with certain speed
Advance, for heating of pipe blank to 735 DEG C, push system speed 5mm/s, pure titanium tube base passes sequentially through the section of extending of core model, expanding deformation section
And sizing section, the expanding pure titanium round tube for being 110mm at outer diameter.
Step 3: sandblasting removes the oxide covering and lubricant coating on pure titanium round tube surface.
Uniformly due to the expanding deformation of pure titanium tube base, the uniform wall thickness of pure titanium round tube made of the above method, pipe
Material outer diameter tolerance is ± 0.3, tube wall thickness deviation less than 2.5%, circularity close to 0, pure titanium round tube wall thickness obtained
Tolerance be less than " GB/T 3624-2010 titanium or titanium alloy seamless pipe " specified in outer diameter >=100mm tubing tolerance ±
0.85mm and tubing allow wall thickness deviation 12.5%, and out-of-roundness and wall unevenness are no more than the tolerance of outer diameter and wall thickness, and
And the inner wall of pure titanium round tube is bright and clean.
Embodiment 4
A kind of TC4 titanium alloy as shown in Figure 1 picks expansion-molding core model processed, including the core model ontology that outer wall is smooth,
The core model ontology is connected in sequence by section 1 of extending, expanding deformation section 2 and sizing section 3, the section 1 of extending, expanding deformation section
2 and the central axes of sizing section 3 be overlapped, the junction of extend section 1 and the expanding deformation section 2 is provided with First Transition circular arc, institute
The junction for stating expanding deformation section 2 and sizing section 3 is provided with the second transition arc, and the end of the sizing section 3 is provided with circular arc
Chamfering, the taper angle extended between section 1 and expanding deformation section 2 are 15 °.
In the present embodiment, the radius R1 of the First Transition circular arc is 7 times of 3 diameter of sizing section.
In the present embodiment, the radius R2 of second transition arc is 0.35 times of 3 diameter of sizing section.
In the present embodiment, the radius R3 of the circular arc chamfering is 2mm.
In the present embodiment, the length of the sizing section 3 is 0.4 times of the diameter of sizing section 3.
Embodiment 5
The present embodiment and embodiment 4 the difference is that: the taper angle extended between section 1 and expanding deformation section 2
It is 20 °；The radius R1 of the First Transition circular arc is 8 times of 3 diameter of sizing section；The radius R2 of second transition arc is fixed
0.2 times of 3 diameter of diameter section；The radius R3 of the circular arc chamfering is 3mm；The length of the sizing section 3 is the diameter of sizing section 3
0.4 times.
In the present embodiment, the connection relationship and installation site of rest part are same as Example 5.
The core model of embodiment 4 and embodiment 5 picks the process of expansion-molding processed for TC4 titanium alloy are as follows:
Step 1: the core print of the core model of expansion-molding is connect with pushing core bar, the initial end of core bar diameter and section of extending
Diameter it is identical, using being welded together, when welding, guarantees that the core model of core bar and the present embodiment is coaxial；
Step 2: TC4 titanium alloy pipe inner and outer wall brushing antioxidant coating, then in TC4 titanium alloy pipe
The external coating lubricant MoS of wall and core model2Coating, pipe cover on being arranged successively core bar, and core bar is locked in fixed memorial archway etc.
In rack, electromagnetic induction heating coil is looped around around expansion-molding core model, and movable memorial archway pushes pushing ring, pushing pipe and pipe
Base is advanced along core bar with certain speed, and to 880 DEG C, push system speed 2mm/s, TC4 titanium alloy pipe successively leads to heating of pipe blank
Cross section of extending, expanding deformation section and the sizing section of core model, the expanding TC4 titanium alloy round tube for being 120mm at outer diameter.
Step 3: the oxide covering and lubricant coating on sandblasting removal TC4 titanium alloy round tube surface.
Uniformly due to the expanding deformation of TC4 titanium alloy pipe, the wall of TC4 titanium alloy round tube made of the above method
Thick uniformly tube outer diameter tolerance is ± 0.3, and tube wall thickness deviation is less than 2.5%, and circularity is close to 0, TC4 titanium obtained
The tolerance of alloy round tube wall thickness is less than outer diameter >=100mm specified in " GB/T 3624-2010 titanium or titanium alloy seamless pipe "
Tubing tolerance ± 0.85mm and tubing allow wall thickness deviation 12.5%, and out-of-roundness and wall unevenness are no more than outer diameter and wall thickness
Tolerance, and the inner wall of TC4 titanium alloy round tube is bright and clean.
Embodiment 6
A kind of TB5 titanium alloy as shown in Figure 1 picks expansion-molding core model processed, including the core model ontology that outer wall is smooth,
The core model ontology is connected in sequence by section 1 of extending, expanding deformation section 2 and sizing section 3, the section 1 of extending, expanding deformation section
2 and the central axes of sizing section 3 be overlapped, the junction of extend section 1 and the expanding deformation section 2 is provided with First Transition circular arc, institute
The junction for stating expanding deformation section 2 and sizing section 3 is provided with the second transition arc, and the end of the sizing section 3 is provided with circular arc
Chamfering, the taper angle extended between section 1 and expanding deformation section 2 are 12 °.
In the present embodiment, the radius R1 of the First Transition circular arc is 8 times of 3 diameter of sizing section.
In the present embodiment, the radius R2 of second transition arc is 1.5 times of 3 diameter of sizing section.
In the present embodiment, the radius R3 of the circular arc chamfering is 10mm.
In the present embodiment, the length of the sizing section 3 is 0.4 times of the diameter of sizing section 3.
Embodiment 7
The present embodiment and embodiment 6 the difference is that: the taper angle extended between section 1 and expanding deformation section 2
It is 18 °；The radius R1 of the First Transition circular arc is 7 times of 3 diameter of sizing section；The radius R2 of second transition arc is fixed
0.5 times of 3 diameter of diameter section；The radius R3 of the circular arc chamfering is 3mm；The length of the sizing section 3 is the diameter of sizing section 3
0.3 times.
In the present embodiment, the connection relationship and installation site of rest part are same as Example 6.
The core model of embodiment 6 and embodiment 7 picks the process of expansion-molding processed for TB6 titanium alloy are as follows:
Step 1: the core print of the core model of expansion-molding is connect with pushing core bar, the initial end of core bar diameter and section of extending
Diameter it is identical, using being welded together, when welding, guarantees that the core model of core bar and the present embodiment is coaxial；
Step 2: TB6 titanium alloy pipe inner and outer wall brushing antioxidant coating, then in TB6 titanium alloy pipe
The external coating lubricant MoS of wall and core model2Coating, pipe cover on being arranged successively core bar, and core bar is locked in fixed memorial archway etc.
In rack, electromagnetic induction heating coil is looped around around expansion-molding core model, and movable memorial archway pushes pushing ring, pushing pipe and pipe
Base is advanced along core bar with certain speed, and heating of pipe blank is to 770 DEG C, and push system speed 1.5mm/s, TB6 titanium alloy pipe is successively
By the section of extending of core model, expanding deformation section and sizing section, the expanding TB6 titanium alloy round tube for being 150mm at outer diameter.
Step 3: the oxide covering and lubricant coating on sandblasting removal TB6 titanium alloy round tube surface.
Uniformly due to the expanding deformation of TB6 titanium alloy pipe, the wall of TB6 titanium alloy round tube made of the above method
Thick uniformly tube outer diameter tolerance is ± 0.3, and tube wall thickness deviation is less than 2.5%, and circularity is close to 0, TB6 titanium obtained
The tolerance of alloy round tube wall thickness is less than outer diameter >=100mm specified in " GB/T 3624-2010 titanium or titanium alloy seamless pipe "
Tubing tolerance ± 0.85mm and tubing allow wall thickness deviation 12.5%, and out-of-roundness and wall unevenness are no more than outer diameter and wall thickness
Tolerance, and the inner wall of TB6 titanium alloy round tube is bright and clean.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way.It is all according to invention skill
Art any simple modification, change and equivalence change substantially to the above embodiments, still fall within technical solution of the present invention
Protection scope in.
Claims (4)
1. a kind of titanium or titanium alloy picks expansion-molding core model processed, which is characterized in that including the core model ontology that outer wall is smooth, institute
Core model ontology is stated to be connected in sequence by section of extending (1), expanding deformation section (2) and sizing section (3), it is the section of extending (1), expanding
The central axes of deformation section (2) and sizing section (3) are overlapped, and the junction of the section of extending (1) and expanding deformation section (2) is provided with the
The junction of one transition arc, the expanding deformation section (2) and sizing section (3) is provided with the second transition arc, the sizing section
(3) end is provided with circular arc chamfering, and the taper angle between the section of extending (1) and expanding deformation section (2) is 10 °~30 °；
Taper when the core model picks expansion-molding processed for pure titanium, between the section of extending (1) and expanding deformation section (2)
Angle is 16 °~30 °；When the core model picks expansion-molding processed for diphasic titanium alloy or beta titanium alloy, the section of extending
(1) taper angle between expanding deformation section (2) is 10 °~20 °；
The length of the sizing section (3) is 0.1 times~0.4 times of the diameter of sizing section (3).
2. a kind of titanium or titanium alloy according to claim 1 picks expansion-molding core model processed, which is characterized in that described
The radius R1 of one transition arc is 2 times~8 times of sizing section (3) diameter.
3. a kind of titanium or titanium alloy according to claim 1 picks expansion-molding core model processed, which is characterized in that described
The radius R2 of two transition arcs is 0.2 times~1.5 times of sizing section (3) diameter.
4. a kind of titanium or titanium alloy according to claim 1 picks expansion-molding core model processed, which is characterized in that the circle
The radius of arc chamfering R3 is 1mm~10mm.
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| CN109092922A (en) * | 2018-07-18 | 2018-12-28 | 太原科技大学 | A kind of large-sized heavy-wall tube casts the design method of crowded composite forming die type chamber |
| CN109821927B (en) * | 2019-03-28 | 2021-06-29 | 北京科技大学 | Production method of large-diameter white copper pipe |
| CN109821926A (en) * | 2019-03-28 | 2019-05-31 | 北京科技大学 | A kind of expander and method of major diameter copper alloy tube |
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| EP0309078A2 (en) * | 1987-09-24 | 1989-03-29 | Foster Wheeler Energy Corporation | Method of apparatus for expanding and sealing a sleeve into a surrounding tube |
| CN101022902A (en) * | 2004-09-21 | 2007-08-22 | 住友金属工业株式会社 | Plug, method of expanding inside diameter of metal pipe or tube using such plug, method of manufacturing metal pipe or tube, and metal pipe or tube |
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| JP2010142810A (en) * | 2007-03-30 | 2010-07-01 | Sumitomo Metal Ind Ltd | Method of treating pipe end of metallic pipe material and plug |
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