CN201046483Y

CN201046483Y - Steel pipe expanding head

Info

Publication number: CN201046483Y
Application number: CNU2007200319525U
Authority: CN
Inventors: 廖世安; 仝天永; 杜海波; 王青斌; 王亚莉
Original assignee: Tianshui Metalforming Machine Tool Co Ltd
Current assignee: Tianshui Metalforming Machine Tool Co Ltd
Priority date: 2007-05-24
Filing date: 2007-05-24
Publication date: 2008-04-16
Anticipated expiration: 2017-05-24

Abstract

The utility model discloses a steel pipe diameter expanding head, comprising a support sleeve, a cone, a lubrication ring, a support ring, a fan shaped plate and a lubrication device, which is characterized in that the front end of the support sleeve is arranged at the front end of the pull rod sleeve of the cantilever, the big end of the module at the periphery of the cone is connected with the T shaped block embedded in the T shaped groove at the back end of the support sleeve, the T shaped block presses the module tightly on the conical surface of the cone under the action of the spring, a swallow-tail block is arranged at the small end of the module, the swallow-tail block is positioned by the swallow-tail guide rail processed by the front end of the cone and slide-connected with the swallow-tail guide rail. The utility model has the advantages that because the requirement of the processing precision of the support sleeve is very high, especially the front end T shaped groove is required to be distributed on the circumference evenly, and the range of cumulative allowable error of the graduation is small. For facilitating the process to be finished on the machine tool of the common machining center, the split-type structure is adopted, the middle is connected by bolts, so that the difficulty that the production can not be proceeded without large-scale high precision machine tool is solved, and the cost is saved.

Description

The pipe expanding head

Technical field

The utility model belongs to pipe expanding equipment, particularly a kind of pipe expanding head.

Background technology

The manufacturer that expanding machine can be provided in the world is kept absolutely secret to the technology of hole enlargement head.The hole enlargement head is because shared space is limited, complex structure.The stress of hole enlargement head is: be converted to the axially-movable of pull bar the radial motion of module, module directly acts on the tube wall of hole enlargement steel pipe, and pressure tube wall material produces mobile and extends, and makes the steel pipe caliber become big.To the design of hole enlargement head, the method that adopts is usually: by being loaded on the inner cone on the pull bar, axial force and the axially-movable suffered cone change radially operation and the radial load that Outer Taper is a module in the world.This radial load acts on the steel pipe inwall and finishes hole enlargement.

Summary of the invention

The utility model technology main purpose provides a kind of rational in infrastructure, pipe expanding head of satisfying instructions for use of suitable all size pipe expanding.

For achieving the above object, solution of the present utility model is: a kind of pipe expanding head, by support set, cone, drip ring, support ring, fanning strip and lubricating arrangement are formed, the front end of described support set is installed in the front end of boom tie sleeve, described cone and drip ring, support ring links together, be enclosed within on the pull bar, and be connected with pull-rod nut, the big end of the module on the described cone periphery links to each other with T type piece in the T type groove that is embedded in the support set rear end, this T type piece is on the conical surface that under the effect of spring module is overlayed in cone, the small end of module has been installed a dovetails, the dovetail guide location that this dovetails is processed by the cone front end, and be slidingly connected.

Because very high to the support set requirement on machining accuracy, especially the requirement of front end T type groove is uniform on circumference, calibration accumulation tolerance is little.For the ease of on the general-purpose machining center lathe, finishing processing, adopt and divide body structure, the middle screw attachment of using solves the difficulty that can't produce when not having the large-scale high-precision lathe, has saved cost.The several sizes of cone faceted pebble according to a hole enlargement specification, adopt different numerical value: the hole enlargement head of small dimension adopts the octahedral cone, and medium specification hole enlargement head adopts ten face cone bodies, and big specification hole enlargement head adopts 12 face cone bodies; Stepping has at first guaranteed the circularity behind the pipe expanding like this, and second has increased the area of friction pair, helps lubricating; Second helps the layout of oilhole.Hole enlargement head for different adopts different taperings.For big hole enlargement head, adopt big taper value, little hole enlargement head adopts little taper value.Its concrete numerical value be 1: 8,1: 7 two kinds, its objective is the composite request that promptly guarantees inlet pipe gap, hole enlargement amount, elastic deformation amount, make the oil cylinder pulling force be the module group of minimum again for the different size of a hole enlargement head, the form that adopts integral module to combine with composite module, promptly the module for small dimension adopts integral module, the module of big specification adopts two combinations or three combinations, so both guarantee the intensity that the module group is stressed, be subjected to friction parts, solved the problem of the too big inconvenience processing of single part size again.The centering mode of hole enlargement head adopts two kinds of forms, and big specification hole enlargement head adopts on the cone and processes T type groove because the cone size is big, and the T type bar of installing on the module slides in its groove, guarantees the applying of the module and the conical surface; The second way is that dovetail adds spring centering, and promptly the big end at the hole enlargement head processes dovetail groove, and the dovetails that is connected in the module termination is slided along dovetail groove.The rear end is pressed on the T type piece with spring, overlays on the cone sliding surface by the dovetails of front end and the spring handle module of rear end.The hardness matching value of module and cone friction pair: because in the hole enlargement process, specific pressure between module and the cone surface is very big, the coupling of general sliding friction pair does not satisfy instructions for use, through repetition test, adopt cone case hardness value HRc38～45, the hardness number of module is comparatively reasonable in HRc50～58.The friction of module and cone again with the support set friction because the hardness of module is fixed, therefore must the correct material of selecting the support set secter pat, by repetition test, we adopt the fanning strip of aluminium bronze material and module to be complementary ideal.Cone is with respect to a pack module that is mated, and cost is lower, and is comparatively reasonable as the consumable accessory of hole enlargement head cone.

Cone case hardness value is defined as HRc38～45.In order to adapt to the wearability of cone, the material of cone is an ideal with mould steel Cr12MoV integral quenching.Forging and heat treatment that mould steel Cr12MoV is big have certain degree of difficulty, can use mould steel 5CrNiMo forging, and wear surface adopts mid frequency induction hardening to handle;

Outer Taper is an ideal with mould steel Cr12MoV integral quenching, but the very difficulty of back processing of quenching still adopts mould steel 5CrNiMo forging, and wear surface adopts mid frequency induction hardening to handle;

The module of composite module has only outer surface to contact with the steel pipe inwall, and it is less to wear and tear, and adopts tool steel T8 for the ease of processing, handles through integral quenching, and hardness number HRc50 just can meet the demands.Integral module must be selected materials and heat treatment processing difficulties by Outer Taper.

Description of drawings

Fig. 1 is the structural representation of first kind of embodiment of the utility model.

Fig. 2 is the A-A cutaway view of Fig. 1.

Fig. 3 is the structural representation of second kind of embodiment of the utility model.

Fig. 4 is the B-B cutaway view of Fig. 3.

The specific embodiment

As shown in Figures 1 to 4, the front end 2.1 of the support set of this hole enlargement head is installed in the front end of boom tie sleeve 1.Cone 3 links together with drip ring 4, support ring 5, is enclosed within on the pull bar 13, and is connected with pull-rod nut 6.The big end of the module 7 on cone 3 peripheries links to each other with T type piece 8 in the T type groove that is embedded in support set rear end 2.2, and this T type piece 8 is overlaying module 7 on the conical surface of cone 3 under the effect of spring 14; The small end of module 7 has been installed a dovetails 9, the dovetail guide location that this dovetails is processed by cone 3 front ends, and along its slip.When pull bar 13 moves right, the nut drive support ring 5 of pull bar front end, drip ring 4, cone 3 move right, the motion effect of cone and module 7, because the support set 2 that is installed on the boom tie sleeve 1 is static, limiting module 7 moves right, module 7 self energys are done radial motion along cone inclined-plane and

secter pat

10, and 10 motions simultaneously of the secter pat on the circumference make the module circular arc determine that outside diameter becomes big.If module effect and steel pipe, steel pipe can be realized hole enlargement.The lubricated employing two line lubrication system of this hole enlargement head, working connection divides the two-way fuel feeding, and one tunnel oil pipe is introduced the friction pair that lubricates big ends of module and secter pat 10 formation through separator 12 from the sleeve of boom tie.The oil pipe on another road passes the pull bar centre bore of boom tie, crosses nut 6, support ring to separator 11, is entering into the cone conical surface through drip ring, lubricated module and conical surface friction pair.Can see that according to Fig. 2 cone 3 is ten face cone bodies.

Described module 7 adopts kit form, is connected successively by Outer Taper 26.1, backing plate 26.2 and module 26.3, forms three one group, and another kind is that Outer Taper 26.1 is connected with module 26.3, forms one group for two.Each pack module links into an integrated entity with screw, location round key 26.4 etc.The sliding surface center fixed of module a T type bar 25, the T type groove in the middle of this T type bar and the cone conical surface matches, and slides along it, the hole enlargement head of this structure can only have certain limitation under the bigger situation in available space.

Claims

1. pipe expanding head, by support set, cone, drip ring, support ring, fanning strip and lubricating arrangement are formed, it is characterized in that: the front end of described support set (2.1) is installed in the front end of boom tie sleeve (1), described cone (3) and drip ring (4), support ring (5) links together, be enclosed within on the pull bar (13), and be connected with pull-rod nut (6), the big end of the module (7) on described cone (3) periphery links to each other with T type piece (8) in the T type groove that is embedded in support set rear end (2.2), this T type piece (8) is overlaying module (7) on the conical surface of cone (3) under the effect of spring (14), the small end of module (7) has been installed a dovetails (9), the dovetail guide location that this dovetails is processed by cone (3) front end, and be slidingly connected.

2. pipe expanding head according to claim 1 is characterized in that: described module (7) adopts kit form, is connected successively by Outer Taper (26.1), backing plate (26.2) and module (26.3), forms three one group.

3. pipe expanding head according to claim 1 is characterized in that: described module (7) adopts kit form, and Outer Taper (26.1) is connected with module (26.3), forms one group for two.