CN111790768A - Eccentric rolling forming device and method for thin-wall metal micro pipe fitting - Google Patents

Eccentric rolling forming device and method for thin-wall metal micro pipe fitting Download PDF

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Publication number
CN111790768A
CN111790768A CN202010396368.XA CN202010396368A CN111790768A CN 111790768 A CN111790768 A CN 111790768A CN 202010396368 A CN202010396368 A CN 202010396368A CN 111790768 A CN111790768 A CN 111790768A
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China
Prior art keywords
metal
grinding roller
blank
grinding
tube
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CN202010396368.XA
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徐竹田
孙磊
彭林法
易培云
来新民
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Priority to CN202010396368.XA priority Critical patent/CN111790768A/en
Publication of CN111790768A publication Critical patent/CN111790768A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15Making tubes of special shape; Making tube fittings

Abstract

The invention relates to an eccentric rolling forming device and method for a thin-wall metal micro pipe fitting, and the eccentric rolling forming device comprises a clamp body (1), a bearing (2), a rotating shaft (3), a gear set (4), a plurality of grinding rollers (5) and a pipeline clamping device (6), wherein a metal pipe blank to be processed is fixed on a main shaft of processing equipment through the pipeline clamping device (6), the grinding rollers (5) are fixed on the rotating shaft (3) and realize synchronous rotating motion through the gear set (4), and the gear set (4) and the bearing (2) are arranged inside the clamp body (1). Compared with the prior art, the forming method has the advantages that the forming process is gradually carried out in both the axial direction and the radial direction of the reducing section of the tube blank, the forming of the long reducing section and the large reducing range of the thin-wall metal capillary tube can be realized, the grinding roller in the forming device has no radial displacement, the pipeline processing equipment is simplified, the influence of related displacement errors on the processing of the reducing metal pipeline is effectively avoided, and the forming performance and the processing quality of the long thin-wall metal capillary tube are improved.

Description

Eccentric rolling forming device and method for thin-wall metal micro pipe fitting
Technical Field
The invention relates to the technical field of manufacturing of a metal pipe with a complex section and variable diameter, in particular to a method and a device for eccentric rolling and variable diameter processing forming of a long thin-wall metal capillary pipe fitting.
Background
The long thin-wall micro metal tube is a main working part of a precise radiator and a heat exchanger, and is widely applied to the fields of nuclear engineering, aerospace and the like. Along with the performance improvement of the heat exchanger and the design requirement of products, the traditional micro round pipe is difficult to meet the actual requirement, and the demand of the reducing metal micro pipe fittings with complex sections is increasing day by day. The existing complex section reducer pipe forming method mainly comprises the following steps: the cold rolling method comprises the steps of tailor welding pipe blanks with different diameters, drawing and forming a pierced billet through a die, and matching a roller and a core rod. For tailor welding forming, various defects of welding cracks and air holes often appear in the welding process, so that the bearing capacity of the metal pipe is reduced, and the flowing of cooling liquid is disturbed. In the drawing forming process, due to the thin wall of the metal pipe, the flowing and friction of materials in the forming process are severe, and the problems of pipeline breakage, wrinkling and the like are easy to occur. Although the metal pipe with good surface quality and large diameter-reducing degree can be obtained by the cold rolling forming method with the reciprocating motion of the roller, the design and the processing of the roller and the core rod required by rolling are complex, the roller of the diameter-reducing pipe with the complex section has long stroke and many passes, the deformation precision of the pipeline is difficult to ensure, and the production efficiency is low.
The rotary type reducing machining forming method represented by spinning and rolling integrates multiple process characteristics of forging, extruding, ring rolling, rolling and the like, has the characteristics of high material utilization rate, wide metal deformation range, low cost and the like, is an economical optimal method suitable for quickly forming thin-wall reducing pipeline parts by multiple metal materials. However, the traditional spinning or rolling method has the following defects in the process of reducing the long thin-wall metal capillary tube:
1. because the diameter of the metal capillary pipe fitting is smaller, the radial feeding amount of the roller is smaller in the common reducing forming process, and the requirement on the displacement control precision of the roller press is higher. In addition, the axial runout of the roller wheel easily causes the reducing pipeline to be bent, and the straightness error is large.
2. The processed pipeline is long in axial direction, thin in pipe wall and low in rigidity, and a pipe fitting is easy to bend in the rolling forming process, so that the variable diameter pipeline has roundness errors and even is twisted and broken.
Chinese patent CN 102069121A utilizes floating ball to design a novel rotary type reducing pipeline processing method, and this method seals the ball in the recess through the briquetting, and Y-shaped push rod changes ball and tubular product radial distance. When the pipe penetrates through the inner hole of the main shaft, the main shaft drives the ball to rotate, and the fork-shaped push rod and the pipe perform axial feed motion to complete local diameter reducing processing of the reducer pipe. But for the metal capillary, the radial feeding precision and the installation error of the fork push rod still need to be considered in the method.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a novel eccentric rolling forming method and device suitable for long and thin-wall metal micro pipe fittings with complicated sections and variable diameters.
The purpose of the invention can be realized by the following technical scheme: the utility model provides an eccentric roll-in forming device of thin wall metal fine pipe fitting which characterized in that, includes the anchor clamps body, bearing, rotation axis, gear train, a plurality of grinding roller and pipeline clamping device, waits to process the metal pipe billet and is fixed in on the processing equipment main shaft through the pipeline clamping device, and a plurality of grinding rollers are fixed in on the rotation axis, realize synchronous rotary motion through the gear train, and gear train and bearing are installed in the anchor clamps body inside, and the anchor clamps body is fixed in processing equipment anchor clamps benchmark installation panel through the screw installation. The fixture body is two-layer box structure, and lateral wall fluting all around is used for motor drive to link, and the bottom surface both sides set up the plane of extending, and plane axis position symmetric distribution two U type grooves are used for the installation location, and the bearing is installed between rotation axis and gear train.
The pipe clamping device stably fixes the pipe blank on a main shaft of the processing equipment, and the pipe blank rotates or axially feeds along with the main shaft. The processing equipment comprises a milling machine, a lathe and other machining equipment, the top of the pipeline clamping device is in butt joint with a main shaft of the processing equipment, the bottom of the pipeline clamping device is provided with an elastic chuck matched with the outer wall of the pipe blank, and the pipe blank is inserted into the elastic chuck and is fixedly clamped through the elastic force of the elastic chuck.
The grinding rollers are eccentric or have variable diameter arrangement on each section perpendicular to the axial direction of the grinding rollers, and the grinding rollers are uniformly arranged in a ring shape by taking the axial line of the metal pipe blank to be processed as the center.
The number of the grinding rollers is more than two, and the axial length of each grinding roller is the length of the variable diameter section required by the metal pipe blank to be processed. The eccentric distance or the variable diameter of the circular section of the grinding roller is matched with the requirement of pipeline reducing machining, and the limit position of the pipe blank extrusion in the axial direction of the grinding roller is ensured to be the bus profile of the pipeline reducing section.
The rotation direction of the grinding roller is consistent with or opposite to that of the metal pipe blank to be processed; the ratio of the rotating speed of the metal pipe blank to be processed to the rotating speed of the grinding roller is more than 1.
The rotating shaft comprises a shaft for fixing each grinding roller and a shaft matched with the gear set. The diameter of the front end of the shaft matched with each grinding roller is smaller. The cylindrical surface with the smaller diameter can be used as a radial positioning cylindrical surface of the grinding roller, and the boss at the front end of the shaft can be used as an axial positioning cylindrical surface of the grinding roller. The top cylindrical surface of the shaft is provided with threads, and the grinding roller is arranged above the shaft and can be clamped and fixed by nuts. The diameters of the front end and the rear end of the shaft matched with the gear set are smaller, threads are arranged on the cylindrical surfaces, the diameter is the same as the size of the gear shaft hole, and the diameter of the middle of the shaft is the same as the diameter of the inner hole of the bearing. The gear can be positioned by the cylindrical surfaces at the front end and the rear end and the bosses and is fixed by nuts.
The gear set is arranged on each rotating shaft and is driven by the same power to drive each grinding roller to synchronously rotate.
The gears of the gear set part are arranged in a layered mode up and down along the axis direction of the tube blank.
The axial feed amount of the metal pipe blank to be processed in the grinding roller along the axis of the pipeline is gradually reduced along with the increase of the reducing forming degree.
The method for carrying out the eccentric rolling forming of the thin-wall metal micro pipe fitting by adopting the device comprises the following steps:
the method comprises the following steps that firstly, a metal pipe blank to be machined is stably clamped on a machining equipment main shaft through a pipeline clamping device;
secondly, each grinding roller rotates to an initial position, the metal pipe blank to be processed is lowered and moved among the grinding rollers, and the grinding rollers are tangent to the excircle of the metal pipe blank to be processed;
thirdly, the metal pipe blank to be processed is driven to rotate along the axis of the pipeline by the rotation of the main shaft, and then each grinding roller synchronously rotates along the axis of the grinding roller through a gear set; because each grinding roller circular section has eccentricity and variable diameter along the axis direction, the initial state of the grinding roller rotating for a circle and being tangent with the excircle of the tube blank is changed into the state of the grinding roller contacting and extruding the tube blank, and finally the grinding roller and the formed pipeline are separated and recovered to the initial state. Therefore, the grinding rollers and the tube blank can complete the local diameter-changing processing and forming of the front end of the metal capillary tube by matching the rotating motions of the grinding rollers and the tube blank at different speeds.
Fourthly, when each grinding roller rotates to an initial position tangent to the outer diameter of the tube blank, different rotary motions of each grinding roller and the tube blank are matched with each other to finish local diameter-changing processing and forming of the metal capillary tube, when each grinding roller rotates for multiple times and then rotates to the initial position tangent to the outer diameter of the tube blank, the rotary motion of the grinding rollers is stopped, the metal tube blank is further lowered and moved into the grinding rollers, the rotary motions of the tube blank and the grinding rollers are repeated, the diameter-changing processing is further finished, and the diameter-changing length is increased until the processing requirements are met;
and fifthly, stopping the rotation motion of the tube blank and the grinding roller, and taking out the formed variable diameter metal capillary tube.
Each grinding roller rotates for a circle and is changed from an initial state tangent to the excircle of the tube blank into a state that the grinding roller contacts and extrudes the tube blank, and finally the grinding roller is separated from the formed pipeline and returns to the initial state.
Compared with the prior art, the invention has the following advantages:
(1) the invention has no radial displacement of each grinding roller in the rotary forming process, simplifies the pipeline processing equipment, effectively solves the problem that displacement control precision error and axial runout of the roller in the common multi-pass rolling forming have influence on the processing of the variable diameter metal pipeline, improves the forming performance and the processing quality of the long thin-wall metal capillary, the length of the processed metal capillary can reach 30mm, the diameter can reach 2mm, the wall thickness can reach 0.3mm, the surface quality of the processed pipeline is better, and the roughness is Ra1.6.
(2) In the metal capillary rotary type reducing machining method, the mandrel is not arranged in the tube blank, and the formed workpiece can be conveniently taken out after the reducing machining of the long thin-wall metal tube is finished without a subsequent demoulding process.
(3) The longer variable-diameter section of the metal capillary pipeline is divided into multiple times of local variable-diameter processing by multiple times of axial feeding of the pipe blank. In the process of one-time local reducing forming, along with the increase of the rotation angle of the grinding roller, the grinding roller is changed from tangent with the excircle of the tube blank into extrusion forming of the tube blank, and the contact extrusion amount of the tube blank is gradually increased. Therefore, the metal capillary rotary reducing processing method is a gradual forming process in both the axial direction and the radial direction of the reducing section of the tube blank, so that the material flow is smooth, the forming performance is improved, and the processing and forming of the thin-wall metal capillary with a longer reducing section of 20-30mm and a larger reducing range of 10-2 mm can be realized.
(4) The problem of drive interference caused by small distance between the grinding rollers due to the fact that the diameter of the metal capillary tube blank is small can be solved by arranging the gears up and down along the axis direction to build the gear set, the same drive is used for driving the grinding rollers to rotate synchronously, coaxiality errors caused by inconsistent extrusion degrees of the grinding rollers on the metal capillary tube blank are avoided, and then the metal pipeline reducing machining quality is improved.
Drawings
FIG. 1 is a schematic cross-sectional view of a rotary reducing processing device for a long thin-wall metal capillary tube according to the present invention;
FIG. 2 is a schematic view of the grinding rollers performing synchronized rotational movement through a gear set;
FIG. 3 is a schematic illustration of the gear sets arranged in layers in the axial direction;
FIG. 4 is a schematic view of the gear set moving in an axial direction;
FIG. 5 is a schematic view of the forming process of the grinding roller and the tube blank by rotating and reducing;
FIG. 6 is a schematic view of a rotary type diameter-changing machining principle of an eccentric diameter-changing grinding roller;
FIG. 7 is a schematic sectional view of a grinding roll in example 1 of the present invention;
FIG. 8 is a view of the geometry and arrangement of a plurality of grinding rollers and a pipe blank, with the dotted line showing the initial position of the grinding rollers and the solid line showing the limit position of the grinding rollers to extrude the pipe blank;
FIG. 9 shows the geometric dimensions and arrangement of the grinding rolls in example 2 of the present invention, with the dotted line showing the initial position of the grinding rolls and the solid line showing the limit positions of the grinding rolls for extruding the tube blanks;
FIG. 10 is a schematic sectional view of a grinding roll in example 2 of the present invention;
FIG. 11 is a view showing the geometrical dimensions and arrangement of the grinding rolls in example 2 of the present invention, with the dotted line showing the initial position of the grinding rolls and the solid line showing the limit positions of the grinding rolls for extruding the tube blanks;
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention.
Example 1
According to the rotary type diameter-variable processing method and device, the metal capillary tube with the diameter of 6mm and the tube thickness of 0.3mm is reduced to the diameter of 3.5mm, and the length of the reduced section is 25 mm.
As shown in fig. 1 to 5, the rotary type diameter-variable processing device for the long thin-wall metal capillary pipe fitting comprises a clamp body 1, a bearing 2, a rotating shaft 3, a gear set 4, a plurality of grinding rollers 5 and a pipeline clamping device 6. A metal capillary tube blank with the diameter of 6mm and the tube thickness of 0.3mm can be fixed on a main shaft through a pipeline clamping device 6 to realize the feeding motion in the rotating and axial directions. Under the pipe, three grinding rollers 5 are uniformly arranged in a ring shape with the axis of the pipe as the center. The geometric dimension and the arrangement condition of the grinding rollers 5 are shown in figures 7-8, the cross section of a single grinding roller along the axis of a central hole is in a right trapezoid shape, the length of the grinding roller 5 is the same as that of a reducing section, the cross sections of vertical axes are circular, the diameter is increased from 16mm to 17.25mm along the axis direction, and the eccentric distance is increased from 0 to 0.492mm along the axis direction. The dotted line is the initial position of the grinding roller 5 and the solid line is the limit position of the grinding roller 5 for extruding the tube blank. The grinding rollers 5 are fixed on the rotating shaft 3, as shown in fig. 4, the rotating shaft 3 comprises a shaft (driven shaft) for fixing each grinding roller 5 and a shaft (driving shaft) matched with the gear set 4, the central driving shaft of the driving shaft is connected with a motor, the gear set 4 is divided into an upper layer and a lower layer, the gear sets of each layer are mutually meshed, the central driving shaft drives the outer driving shaft to rotate through meshing of gears Z1 and Z2, and a1 is the center distance between the gears Z1 and Z2; the driving shaft transmits the rotary motion to the driven shaft through two gears Z3 and Z4, and the center distance isa2, grinding rollers are arranged on driven shafts, and each driven shaft is meshed with a driving shaft through a gear set, and synchronous rotary motion can be realized through the gear set 4 shown in fig. 4. Each gear in the gear set 4 is a standard spur gear, the module of each gear is 2, and the number of teeth is respectively as follows: z is a radical of1=30,z2=15,z3=22,z412. The gear set 4 and the bearing 2 are installed inside the clamp body 1, and the clamp body 1 is fixedly installed on a milling machine T-shaped groove clamp installation panel through T screws and nuts.
The specific method for carrying out rotary diameter-reducing machining forming on the metal capillary according to the device comprises the following steps:
the first step is as follows: a metal pipe blank with the diameter of 6mm and the pipe thickness of 0.3mm is fixed on a main shaft through a pipeline clamping device 6.
The second step is that: the grinding roller 5 is adjusted to the initial position, the pipe blank is lowered to the position 3mm inside the grinding roller 5 through axial displacement of a main shaft of the milling machine, and the excircle of the pipe blank is tangent to each grinding roller 5.
The third step: the main shaft rotating speed is set as follows: 60r/min, the motor drives the gear, the rotating speed of the grinding roller 5 is 12r/min after the gear group 4 drives the gear, and the main shaft and each grinding roller 5 rotate in the same direction. The grinding roller 5 is changed from an initial state of being tangent to the excircle of the tube blank to extruding the tube blank, and as shown in figure 6, the rotation of the tube blank and the grinding roller 5 completes the diameter reducing processing of 3mm at the front end of the pipeline.
The fourth step: after 30s of operation, when the grinding roller 5 rotates to the initial position tangent to the metal pipe blank with the outer diameter of 6mm, the grinding roller 5 stops moving. The pipe material with the diameter reduced locally is lowered by 2.8mm along the axial direction by a main shaft of the milling machine and further goes deep into the grinding roller.
Repeating the third and fourth steps for many times, reducing the diameter of the partially deformed and undeformed pipe blank, and further increasing the diameter reduction length. The axial feed amount of the subsequent series along the axis of the pipeline is 2.6mm, 2.4mm, 2.2mm, 2mm, 1.8mm, 1.8mm, 1.6mm, 1.4mm, 1.2mm, 1mm, 0.8mm and 0.4mm, and the axial feed amount is gradually reduced along with the increase of the diameter-variable forming degree. Finally, the metal capillary tube shown in figure 5 can be obtained, the diameter of the tube blank with the outer diameter of 6mm is reduced to 3.5mm, and the length of the reduced section is 25 mm.
And fifthly, stopping the rotation motion of the main shaft and the grinding roller 5, and taking out the formed variable diameter metal capillary pipeline.
Example 2:
according to the rotary type diameter-variable processing method and device, the metal capillary tube with the diameter of 6mm and the tube thickness of 0.3mm is reduced to the diameter of 2.0mm, and the length of the reduced section is 30 mm.
By adopting the device, the metal capillary tube blank with the diameter of 6mm and the tube thickness of 0.3mm is fixed on the main shaft through the pipeline clamping device 6. Two grinding rollers 5 are fixed on the rotating shaft 3, the geometric dimension and distribution of the grinding rollers 5 are shown in figure 9, specifically, the cross section shape of the grinding rollers 5 perpendicular to the axis in the embodiment is gradually transited from a circle with the diameter of 16mm to an ellipse with the major diameter of 18mm and the minor diameter of 17mm along the axis direction, and the axial length of the grinding rollers 5 is the same as the length of the reduced diameter section and is 30 mm. In FIG. 9, the dotted line represents the initial position of the grinding roller 5 and is tangent to the outer circumference of the metal capillary having a diameter of 6mm, and the solid line represents the limit position of the grinding roller 5 to extrude the pipe blank. Two grinding rollers 5 realize synchronous rotary motion through gear train 4, and each gear is standard cylinder straight-teeth gear in the gear train 4, and each gear modulus is 2, and the number of teeth is respectively: z is a radical of1=30,z2=15,z3=22,z412. The gear set 4 and the bearing 2 are installed inside the clamp body 1, and the clamp body 1 is fixedly installed on a milling machine T-shaped groove clamp installation panel through T screws and nuts.
The specific method for carrying out rotary diameter-reducing machining forming on the metal capillary according to the device comprises the following steps:
in the first and second steps, similarly to the method of example 1, a metal pipe blank having a diameter of 6mm and a pipe thickness of 0.3mm was fixed to a main shaft by a pipe clamping device 6. The grinding roller 5 is adjusted to the initial position of the dotted line shown in figure 7, the pipe blank is lowered to the position 6mm inside the grinding roller 5 through the axial displacement of the main shaft of the milling machine, and the excircle of the pipe blank is tangent to the two grinding rollers 5.
The third step: the main shaft rotating speed is as follows: 120r/min, the rotating speeds of the two grinding rollers 5 are as follows: 12r/min, the main shaft and the two grinding rollers 5 rotate in the same direction. As shown in FIG. 9, the initial state of the grinding rollers 5 in contact with the outer circle of the tube blank is changed into the state of extruding the tube blank, and the rotation motion of the tube blank and the grinding rollers 5 completes the diameter reducing processing of 6mm at the front end of the pipeline.
The fourth step: after 30s of operation, when the grinding roller 5 rotates to the initial position tangent to the metal pipe blank with the outer diameter of 6mm, the grinding roller 5 stops moving. The pipe material with the diameter reduced locally is lowered by 5mm along the axial direction by a main shaft of the milling machine and further goes deep into the grinding roller.
Repeating the third and fourth steps for many times, reducing the diameter of the partially deformed and undeformed pipe blank, and further increasing the diameter reduction length. The axial feed of the subsequent series along the axis of the pipeline is 4mm, 3.5mm, 3mm, 2.7mm, 2mm, 1.5mm, 1mm, 0.8mm, 0.5 mm. Finally, the metal capillary tube with the outer diameter of 6mm can be reduced to the diameter of 2mm, and the length of the reduced section is 30 mm.
And fifthly, stopping the rotation motion of the milling machine main shaft and the grinding roller 5, and taking out the formed variable diameter metal capillary pipeline.
Example 3:
according to the rotary type diameter-variable processing method and device, the metal capillary tube with the diameter of 6mm and the tube thickness of 0.3mm is processed into the Y-shaped metal tube, and the length of the diameter-variable section is 10 mm.
By adopting the device in the embodiment 1, a metal capillary tube blank with the diameter of 6mm and the tube thickness of 0.3mm is fixed on a main shaft through a pipeline clamping device 6, three grinding rollers 5 are fixed on a rotating shaft 3, the geometric size and the distribution condition of the grinding rollers 5 are shown in figures 10-11, the geometric size of a single grinding roller is similar to that of the device in the embodiment 1, and the length of each grinding roller 5 is the same as that of a variable-diameter section and is 10 mm. The dotted line is the initial position of the grinding roller 5 and the solid line is the limit position of the grinding roller 5 for extruding the tube blank. A number of grinding rollers 5 are fixed to the rotating shaft 3 and are set in a synchronized rotational movement by means of a gear train 4 as shown in fig. 3. Each gear in the gear set 4 is a standard spur gear, the module of each gear is 2, and the number of teeth is respectively as follows: z is a radical of1=30,z2=15,z3=22,z412. The gear set 4 and the bearing 2 are installed inside the clamp body 1, and the clamp body 1 is fixedly installed on a milling machine T-shaped groove clamp installation panel through T screws and nuts.
The specific method for carrying out rotary diameter-reducing machining forming on the metal capillary according to the device comprises the following steps:
the first step and the second step are the same as the example 1, the tube blank is lowered to the 2mm inside the grinding roller 5, and the outer circle of the tube blank is tangent to each grinding roller 5.
The third step: the main shaft is driven by a stepping motor, a single pulse signal rotates by 120 degrees, and the rotating speed is as follows: 40 r/min. The servo motor drives the gear, and the rotating speed of the grinding roller 5 after transmission through the gear set 4 is as follows: 12r/min, the main shaft and each grinding roller 5 rotate in the same direction. The grinding roller 5 is changed from an initial state tangent to the excircle of the tube blank to extrude the tube blank. As shown in fig. 10 to 11, the rotational movements of both the stock tube and the grinding roll 5 cooperate to perform a 2mm diameter reduction of the front end of the tube.
The fourth step: after 30s of operation, when the grinding roller 5 rotates to the initial position tangent to the metal pipe blank with the outer diameter of 6mm, the grinding roller 5 stops moving. The pipe material with the diameter reduced locally is axially lowered by 1.8mm by the main shaft and further goes deep into the grinding roller.
Repeating the third and fourth steps for a plurality of times, wherein the axial feeding amount along the axis of the pipeline in a subsequent series is 1.5mm, 1.2mm, 1mm and 0.5mm, and the axial feeding amount is gradually reduced along with the increase of the diameter-changing forming degree. Finally, the metal capillary tube blank with the outer diameter of 6mm can be processed into a Y-shaped tube with the reducing section length of 10 mm.
And fifthly, stopping the rotation motion of the main shaft and the grinding roller 5, and taking out the formed variable diameter metal capillary pipeline.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides an eccentric roll-in forming device of thin wall metal fine pipe fitting, its characterized in that, including the anchor clamps body (1), bearing (2), rotation axis (3), gear train (4), a plurality of grinding roller (5) and pipeline clamping device (6), treat that to process the metal pipe blank and be fixed in on the processing equipment main shaft through pipeline clamping device (6), a plurality of grinding roller (5) are fixed in on rotation axis (3), realize synchronous rotary motion through gear train (4), gear train (4) and bearing (2) are installed inside the anchor clamps body (1).
2. The eccentric roll forming device of the thin-wall metal micro pipe fitting according to claim 1, wherein the pipe clamping device (6) stably fixes the pipe blank on a main shaft of the processing equipment, and the pipe blank rotates or axially feeds along with the main shaft.
3. The eccentric rolling forming device for the thin-wall metal micro-pipe fittings according to the claim 1, characterized in that each section of the grinding roller (5) vertical to the axial direction has eccentric or variable diameter setting, and a plurality of grinding rollers (5) are uniformly arranged in a ring shape by taking the axial line of the metal pipe blank to be processed as the center.
4. The eccentric rolling forming device for the thin-wall metal micro pipe fittings according to claim 3, wherein the number of the grinding rollers (5) is more than two, and the axial length of each grinding roller (5) is the length of the variable diameter section required by the metal pipe blank to be processed.
5. The eccentric roll forming device for the thin-wall metal micro-tube part according to the claim 3, characterized in that the rotation direction of the grinding roll (5) is the same as or opposite to the rotation direction of the metal tube blank to be processed; the ratio of the rotating speed of the metal pipe blank to be processed to the rotating speed of the grinding roller (5) is more than 1.
6. The eccentric roll forming device for thin-walled metal capillary tubes according to claim 1, wherein the rotating shaft (3) comprises a shaft for fixing each grinding roll (5) and a shaft matched with the gear train (4).
7. The eccentric rolling forming device for the thin-wall metal micro-tubes as claimed in claim 1 or 5, wherein the gear set (4) is installed on each rotating shaft (3) and is driven by the same power to drive each grinding roller (5) to rotate synchronously.
8. The eccentric roll forming device for thin-walled metal capillary tubes according to claim 7, wherein the gears of the gear set (4) are arranged in layers up and down along the axis of the tube blank.
9. The eccentric roll forming device for the thin-wall metal micro-tube according to the claim 1, characterized in that the axial feeding amount of the metal tube blank to be processed along the axis of the tube inside the grinding roll (5) is gradually reduced along with the increase of the reducing forming degree.
10. A method for processing a tube blank by using the thin-walled metal fine tube eccentric rolling forming device according to claim 1, which comprises the following steps:
the method comprises the following steps that firstly, a metal pipe blank to be processed is stably clamped on a main shaft of processing equipment through a pipeline clamping device (6);
secondly, each grinding roller (5) rotates to an initial position, the metal pipe blank to be processed is descended and moved to a plurality of grinding rollers (5), and the grinding rollers (5) are tangent to the excircle of the metal pipe blank to be processed;
thirdly, the metal pipe blank to be processed is driven to rotate along the axis of the pipeline by the rotation of the main shaft, and then each grinding roller (5) synchronously rotates along the axis of the grinding roller through a gear set (4);
fourthly, when each grinding roller (5) rotates to an initial position tangent to the outer diameter of the tube blank, different rotary motions of each grinding roller (5) and the tube blank are matched with each other to finish the local reducing machining of the metal capillary tube, when each grinding roller (5) rotates for multiple times and then rotates to the initial position tangent to the outer diameter of the tube blank, the rotary motion of the grinding roller (5) is stopped, the metal tube blank is further descended to the inside of the grinding roller (5), the rotary motions of the tube blank and the grinding roller (5) are repeated, the reducing machining is further finished, and the reducing length is increased until the reducing length meets the machining requirements;
and fifthly, stopping the rotation motion of the tube blank and the grinding roller (5), and taking out the formed variable diameter metal capillary pipeline.
CN202010396368.XA 2020-05-12 2020-05-12 Eccentric rolling forming device and method for thin-wall metal micro pipe fitting Pending CN111790768A (en)

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CN202010396368.XA CN111790768A (en) 2020-05-12 2020-05-12 Eccentric rolling forming device and method for thin-wall metal micro pipe fitting

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Application Number Priority Date Filing Date Title
CN202010396368.XA CN111790768A (en) 2020-05-12 2020-05-12 Eccentric rolling forming device and method for thin-wall metal micro pipe fitting

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003136131A (en) * 2001-10-26 2003-05-14 Sumitomo Metal Ind Ltd Method for manufacturing hollow member provided with solid-core portion in end side
CN101474634A (en) * 2009-02-05 2009-07-08 太原重工股份有限公司 Three-roller tube-rolling machine
JP2013230500A (en) * 2012-04-02 2013-11-14 Nippon Steel & Sumitomo Metal Corp Roll stand, and three-roll reducing mill mounting the same
PL223468B1 (en) * 2013-10-31 2016-10-31 Lubelska Polt Method for reducing hollow forgings
CN108555035A (en) * 2018-06-08 2018-09-21 山西创奇实业有限公司 A kind of totally-enclosed guide and guards for tubing oblique milling three-roll piercer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003136131A (en) * 2001-10-26 2003-05-14 Sumitomo Metal Ind Ltd Method for manufacturing hollow member provided with solid-core portion in end side
CN101474634A (en) * 2009-02-05 2009-07-08 太原重工股份有限公司 Three-roller tube-rolling machine
JP2013230500A (en) * 2012-04-02 2013-11-14 Nippon Steel & Sumitomo Metal Corp Roll stand, and three-roll reducing mill mounting the same
PL223468B1 (en) * 2013-10-31 2016-10-31 Lubelska Polt Method for reducing hollow forgings
CN108555035A (en) * 2018-06-08 2018-09-21 山西创奇实业有限公司 A kind of totally-enclosed guide and guards for tubing oblique milling three-roll piercer

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