CN109784001B - Design method of forming cutter for tail end structure of automobile radiator core with any pipe diameter - Google Patents
Design method of forming cutter for tail end structure of automobile radiator core with any pipe diameter Download PDFInfo
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- CN109784001B CN109784001B CN201910215476.XA CN201910215476A CN109784001B CN 109784001 B CN109784001 B CN 109784001B CN 201910215476 A CN201910215476 A CN 201910215476A CN 109784001 B CN109784001 B CN 109784001B
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Abstract
The invention discloses a method for designing a forming cutter of an arbitrary pipe diameter tail end structure of an automobile radiator core, which comprises the following steps: collecting external dimension parameters of a flat tube of a processed radiator core body, and determining the tube diameter and the wall thickness of the flat tube; the dimensional parameters include: the inner diameter L of the flat tube, the wall thickness t of the flat tube and the inner wall spacing h of the flat tube are measured; according to the appearance characteristics of the end structure of the fillet hexagonal frustum, the diameter size and the wall thickness of the flat tube, the processing part of the forming cutter is designed into a middle-layer step surface and an upper-layer step surface and a lower-layer step surface, and the thickness and the appearance size of the step surfaces are respectively designed; designing the transition between the upper and lower step surfaces and the intermediate step surface and the transition connection between the intermediate step surface and the cutter body plane according to the thickness and the external dimension of the intermediate step surface and the upper and lower step surfaces and the design requirement of an extrusion forming die to obtain the dimension parameters of each transition fillet; and designing the external dimension of the cutter body according to the thickness and the external dimension of the step surface, the dimension of each transition fillet and the dimension of the base of the machine tool cutter, thereby finishing the dimension design of the whole cutter.
Description
Technical Field
The invention relates to a design method of a forming cutter, in particular to a design method of a forming cutter of an arbitrary pipe diameter tail end structure of an automobile radiator core.
Background
The automobile radiator core is an indispensable important part in an automobile water-cooled engine cooling system, a heat dissipation array pipe of the automobile radiator core mostly adopts a flat pipe structure, water inlet and outlet positions of the heat dissipation array pipe are repeatedly impacted by water flow, fatigue fracture damage is easily caused, the working efficiency of the whole radiator is reduced, even the heat dissipation array pipe fails, the traditional flat pipe cannot meet the performance requirements of a single body and the whole automobile, a novel automobile radiator flat pipe with a tail end structure design becomes an industry trend, under the background of a large amount of processing requirements, the requirements of processing equipment and a processing cutter are gradually improved, and therefore the design method of the tail end structure forming cutter of the radiator core with any pipe diameter is very necessary.
Common radiator end structure shaping cutter is as patent CN208099121U, and its notch setting passes through direction circular arc I transition between the middle part department of blade oral area and notch and both sides blade oral area, and the whole roughness of blade is changeed and is controlled, through reducing its roughness, can effectively reduce the resistance that receives when the flaring, but the width difference of its two-layer step face is less, and the terminal hydraulic performance of flat pipe end can't be improved to the end structure of processing out.
The specific patent references and related documents mentioned above are:
1) And a radiator core B-shaped flat tube flaring cutter, and has the patent number CN208099121U. The utility model provides a B-shaped flat tube flaring cutter of a radiator core, which comprises a plurality of blades, a fixed seat and a positioning pin shaft; in this structure, blade, fixing base and locating pin axle intercombination become wholly, have not only reduced the processing degree of difficulty of each part, have more improved material utilization, have reduced the waste, set up the middle notch in blade oral area department and can effectively avoid damaging the flat tub of bending leg of B type, have further reduced the disability rate of B type pipe, have reached the purpose of practicing thrift the cost.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for designing a forming cutter of an end structure of any pipe diameter of an automobile radiator core, so as to meet the design and processing requirements of the forming cutter of the end structure of a flat pipe with any pipe diameter, reduce the design cost of the forming cutter and improve the practicability of the end forming cutter.
The purpose of the invention is realized by the following technical scheme:
a method for designing a forming cutter of an arbitrary pipe diameter tail end structure of an automobile radiator core body comprises the following steps:
A. collecting external dimension parameters of a flat tube of a processed radiator core body, and determining the tube diameter and the wall thickness of the flat tube; the dimensional parameters include: the inner diameter L of the flat tube, the wall thickness t of the flat tube and the inner wall spacing h of the flat tube are measured;
B. according to the appearance characteristics of the end structure of the fillet hexagonal frustum, the diameter size and the wall thickness of the flat tube, the processing part of the forming cutter is designed into a middle-layer step surface and an upper-layer step surface and a lower-layer step surface, and the thickness and the appearance size of the step surfaces are respectively designed;
C. designing the transition between the upper and lower step surfaces and the middle step surface and the transition connection between the middle step surface and the plane of the cutter body according to the thickness and the external dimension of the middle step surface and the upper and lower step surfaces and the design requirement of an extrusion forming die to obtain the dimension parameters of each transition fillet;
D. and designing the external dimension of the cutter body according to the thickness and the external dimension of the step surface, the dimension of each transition fillet and the dimension of the base of the machine tool cutter, thereby finishing the dimension design of the whole cutter.
According to the invention, based on the collection of the external dimension parameters of the flat tube of the processed radiator core, the parameters of the inner diameter L, the wall thickness t and the inner wall spacing h of the flat tube are determined, and then the thickness and the external dimension of two step surfaces are respectively designed; by summarizing the thickness and the external dimension of the step surfaces, designing the transition connection between the step surfaces and the plane of the cutter body to obtain the dimension parameters of each transition fillet; finally, according to the size of the base of the machine tool cutter, the external dimension of the cutter body is designed, so that the size design of the whole cutter is completed; compared with other flaring cutters, the cutter designed by the forming cutter design method provided by the invention has the advantages of smooth surface transition, low forming resistance, larger step height difference and better hydraulic performance of the formed tail end structure.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a structural flow chart of a method for designing a forming cutter for an arbitrary pipe diameter tail end structure of an automobile radiator core according to the present invention;
fig. 2a and fig. 2b are schematic diagrams of an end shape structure of the flat tube before being processed by the forming tool and an end shape structure of the flat tube after being processed by the forming tool, respectively;
FIG. 3 is a schematic structural diagram of a forming tool designed according to the present invention;
FIG. 4 is a schematic top view of a forming tool designed according to the present invention;
fig. 5 is a right-side schematic view of a forming tool designed according to the present invention.
Detailed Description
According to the technical scheme of the invention, a plurality of structural modes and manufacturing methods of the invention can be provided by a person skilled in the art without changing the essential spirit of the invention. Therefore, the following detailed description and the accompanying drawings are only specific illustrations of the technical solutions of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical solutions of the present invention.
The invention is described in more detail below with reference to the following example and the accompanying drawing 1:
the invention relates to a non-contact tube side fluid temperature measuring method based on pipeline outer wall temperature measurement, which comprises the following specific steps:
the method specifically comprises the following steps:
width W of the middle step surface 1 The relationship with the flat tube inner diameter L is as follows:
W 1 ＝(1+α d )L
wherein alpha is d Is the pipe diameter direction deformation coefficient; when the wall thickness t of the flat tube is less than or equal to 2mm, alpha d =0.02, [ alpha ] when the wall thickness t of the flat tube is > 2mm d ＝0.01；
Boundary distance W between middle step surface and upper and lower step surfaces 2 The relation between the inner diameter L of the flat tube and the inner diameter L of the flat tube is as follows:
W 2 ＝4.6+β b L
wherein beta is b Is the step surface boundary coefficient; beta when the inner diameter L of the flat tube is less than or equal to 30mm b =0.005, beta when the flat tube inner diameter L is greater than 30mm b ＝0.006；
Radius R of transition fillet of apex angle and edge of middle-layer step surface 1 Width W of the step surface of the middle layer 1 The boundary distance W between the middle step surface and the upper and lower step surfaces 2 The relationship of (1) is:
R 1 ＝W 1 -W 2
＝(1+α d +β b )L-4.6
angle a of transition fillet between vertex angle of middle step surface and edge 1 Radius R of transition fillet between vertex angle of middle-layer step surface and edge 1 The relationship between them is:
A 1 ＝45-7.86lnR 1
＝45-7.86ln[(1+α d +β b )L-4.6]
radius R of outer circular arc of middle-layer step surface cutting edge 2 The relationship with the above design dimensions is:
2R 2 sinα 0 ＝L 0
R 2 (1-cosα 0 )＝0.8h 0
wherein alpha is 0 Is the arc angle of the outer arc of the cutting edge of the middle step surface, L 0 Is the linear distance h of two vertex angles of the middle step surface 0 Is the effective length of the knife edge of the middle step surface,
L 0 ＝[W 1 -2R 1 (1-cosA 1 )]
h 0 ＝L 2 -L 3 -L 4 -L 5
the four formulas are combined to obtain R 2 The design formula of (2) is as follows:
obtaining the following through equivalent transformation:
thickness of the middle step surfaceDegree t 3 Thickness t of upper and lower step surfaces 2 The relationship with the wall thickness t of the flat tube is:
t 3 ＝α h h
t 2 ＝2t 3
wherein alpha is h Is the thickness coefficient of the cutter; alpha when t is less than or equal to 2.5mm h =1.1, α when t > 2.5mm h ＝1；
Length L of the middle step surface 2 The relationship with the wall thickness t of the flat tube is:
L 2 ＝20+t
length L of upper and lower step surfaces 3 Length L of the step surface with the middle layer 2 Boundary distance W between the middle layer step surface and the upper and lower layer step surfaces 2 The relationship between them is:
L 3 ＝L 2 -2W 2
＝20+t-2(4.6+β b L)
＝t-2β b L+10.8
the distance L between the upper and lower step surfaces and the knife body is obtained by designing the size according to the proportion 4 Length L of the step surface with the middle layer 2 The relationship between (a) and (b) is:
L 4 ＝0.25L 2
＝0.25(20+t)
＝5+0.25t
considering the influence of the wall thickness of the flat tube on the processing difficulty, the distance L between the upper and lower step surfaces and the blade edge bottom 5 The relation between the inner diameter L of the flat pipe and the wall thickness t of the flat pipe is as follows:
L 5 ＝0.25L-t；
fig. 2a and fig. 2b are schematic diagrams of an end shape structure of the flat tube before being processed by the forming tool and an end shape structure of the flat tube after being processed by the forming tool, respectively.
the method specifically comprises the following steps:
radius R of transition fillet between upper and lower layer step surface and intermediate layer step surface 3 And length L 5 Thickness t of upper and lower step surfaces 2 Thickness t of the middle step surface 3 The relationship between them is:
R 3 sinα 1 ＝0.7L 5
combining the above equations yields:
radius R of transition circular arc between middle-layer step surface and knife body plane 4 And length L 4 Thickness t of the middle step surface 3 The relationship between them is:
R 4 sinα 2 ＝L 4
combining the above equations yields:
the method specifically comprises the following steps:
thickness t of blade 1 Should satisfy t 1 ≥t 2 According to the dimension of the base of the machine tool, the thickness t of the cutter body is designed 1 ；
The distance L between the transition arc tail end of the middle step surface and the plane of the knife body and the knife body 1 Can satisfy L 1 ≤0.5W 1 According to the relative position of the base of the machine tool and the clamp.
FIG. 3 is a schematic structural diagram of a forming tool designed in this embodiment; FIG. 4 is a schematic top view of a forming tool designed according to this embodiment; fig. 5 is a right-side view schematically illustrating the forming tool designed in this embodiment.
The mode makes the design steps of the cutter more definite, and the design of the forming cutter of the end structure of the flat tube with different pipe diameters is more widely guided; the designed cutter has smooth surface transition, low forming resistance, larger step height difference and better hydraulic performance of a formed tail end structure.
Although the embodiments of the present invention have been described above, the above description is only for the purpose of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A method for designing a forming cutter of an arbitrary pipe diameter tail end structure of an automobile radiator core is characterized by comprising the following steps:
A. collecting external dimension parameters of a flat tube of a processed radiator core body, and determining the tube diameter and the wall thickness of the flat tube; the dimensional parameters include: the inner diameter L of the flat pipe, the wall thickness t of the flat pipe and the inner wall space h of the flat pipe are measured;
B. designing the processing part of a forming cutter into a middle-layer step surface and an upper-layer step surface and a lower-layer step surface according to the appearance characteristics of the tail end structure of the fillet hexagonal frustum and the pipe diameter size and the wall thickness of the flat pipe, and respectively designing the thickness and the appearance size of the step surfaces;
C. designing the transition between the upper and lower step surfaces and the middle step surface and the transition connection between the middle step surface and the plane of the cutter body according to the thickness and the external dimension of the middle step surface and the upper and lower step surfaces and the design requirement of an extrusion forming die to obtain the dimension parameters of each transition fillet;
D. designing the external dimension of the cutter body according to the thickness and the external dimension of the step surface, the dimension of each transition fillet and the dimension of the base of the machine tool cutter, thereby finishing the dimension design of the whole cutter;
the forming cutter is formed by the thickness of t 1 The rectangular steel plate is cut into rectangles, then the head of the cutter is milled into three layers of step surfaces, namely an upper layer step surface, a middle layer step surface and a lower layer step surface, wherein the shapes of the upper layer step surface, the lower layer step surface and the middle layer step surface are symmetrical relative to the middle layer step surface, the outline size of the horizontal plane of the middle layer step surface is larger than that of the upper layer step surface and the lower layer step surface, then the outline of the middle layer step surface is milled into an outline with a certain arc line, and finally, the round corner milling treatment is carried out on the junction between the step surfaces, so that the smooth transition of the appearance of the whole cutter is ensured;
the step B specifically comprises the following steps:
width W of the middle step surface 1 The relation between the inner diameter L of the flat tube and the inner diameter L of the flat tube is as follows:
W 1 ＝(1+α d )L
wherein alpha is d The pipe diameter direction deformation coefficient; when the wall thickness t of the flat tube is less than or equal to 2mm, alpha d =0.02, [ alpha ] when the wall thickness t of the flat tube is > 2mm d ＝0.01；
Boundary distance W between middle step surface and upper and lower step surfaces 2 The relation between the inner diameter L of the flat tube and the inner diameter L of the flat tube is as follows:
W 2 ＝4.6+β b L
wherein beta is b Is the step surface boundary coefficient; beta when the inner diameter L of the flat tube is less than or equal to 30mm b =0.005, beta when the flat tube inner diameter L is more than 30mm b ＝0.006；
Radius R of transition fillet of vertex angle and edge of middle-layer step surface 1 Width W of the step surface of the middle layer 1 The boundary distance W between the middle step surface and the upper and lower step surfaces 2 The relationship of (1) is:
R 1 ＝W 1 -W 2
＝(1+α d +β b )L-4.6
angle a of transition fillet between vertex angle of middle step surface and edge 1 Radius R of transition fillet between vertex angle of middle-layer step surface and edge 1 The relationship between them is:
A 1 ＝45-7.86ln R 1
＝45-7.86ln[(1+α d +β b )L-4.6]
radius R of outer circular arc of middle-layer step surface cutting edge 2 The relationship with the above design dimensions is:
2R 2 sinα 0 ＝L 0
R 2 (1-cosα 0 )＝0.8h 0
wherein alpha is 0 Is the arc angle of the outer circular arc of the cutting edge of the middle step surface L 0 Is the linear distance h of two vertex angles of the middle step surface 0 Is the effective length of the knife edge of the middle step surface,
L 0 ＝[W 1 -2R 1 (1-cos A 1 )]
h 0 ＝L 2 -L 3 -L 4 -L 5
the four formulas are combined to obtain R 2 The design formula of (2) is as follows:
obtaining the following through equivalent transformation:
thickness t of the middle step surface 3 Thickness t of upper and lower step surfaces 2 The relationship with the wall thickness t of the flat tube is:
t 3 ＝α h h
t 2 ＝2t 3
wherein alpha is h Is the thickness coefficient of the cutter; alpha when t is less than or equal to 2.5mm h =1.1, alpha when t > 2.5mm h ＝1；
Length L of the middle step surface 2 The relationship with the wall thickness t of the flat tube is:
L 2 ＝20+t
length L of upper and lower step surfaces 3 Length L of the step surface with the middle layer 2 Boundary distance W between the middle layer step surface and the upper and lower layer step surfaces 2 The relationship between them is:
L 3 ＝L 2 -2W 2
＝20+t-2(4.6+β b L)
＝t-2β b L+10.8
the distance L between the upper and lower step surfaces and the knife body is obtained by designing the size according to the proportion 4 Length L of the step surface with the middle layer 2 The relationship between (a) and (b) is:
L 4 ＝0.25L 2
＝0.25(20+t)
＝5+0.25t
considering the influence of the wall thickness of the flat tube on the processing difficulty, the distance L between the upper and lower step surfaces and the blade edge bottom 5 The relation between the inner diameter L of the flat pipe and the wall thickness t of the flat pipe is as follows:
L 5 ＝0.25L-t；
the step C specifically comprises the following steps:
transition fillet radius R of upper and lower layer step surfaces and middle layer step surface 3 And length L 5 Thickness t of upper and lower step surfaces 2 Thickness t of the middle step surface 3 The relationship between them is:
R 3 sinα 1 ＝0.7L 5
the above formula can be combined to obtain:
radius R of transition arc between middle step surface and knife body plane 4 And length L 4 Thickness t of the middle step surface 3 The relationship between them is:
R 4 sinα 2 ＝L 4
the above formula can be combined to obtain:
2. the method for designing the forming cutter of the tail end structure of the core body of the automobile radiator with any pipe diameter according to claim 1, wherein the step D specifically comprises the following steps:
blade thickness t 1 Should satisfy t 1 ≥t 2 According to the dimension of the base of the machine tool, the thickness t of the cutter body is designed 1 ；
The distance L between the transition arc tail end of the middle step surface and the plane of the knife body and the knife body 1 Can satisfy L 1 ≤0.5W 1 According to the relative position of the base of the machine tool and the clamp.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202709798U (en) * | 2012-08-09 | 2013-01-30 | 南方英特空调有限公司 | Engine radiator for vehicle with medium and low emission |
| CN203116564U (en) * | 2013-03-27 | 2013-08-07 | 瑞安市邦众汽车部件有限公司 | Novel automobile radiator |
| CN204362494U (en) * | 2015-02-05 | 2015-05-27 | 蒋建军 | Heat pipe fin slices radiator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2535680T3 (en) * | 2003-07-02 | 2015-05-13 | Urschel Laboratories, Inc. | A knife arrangement to minimize the appearance of cracks and fissures during high-speed cutting of food products |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202709798U (en) * | 2012-08-09 | 2013-01-30 | 南方英特空调有限公司 | Engine radiator for vehicle with medium and low emission |
| CN203116564U (en) * | 2013-03-27 | 2013-08-07 | 瑞安市邦众汽车部件有限公司 | Novel automobile radiator |
| CN204362494U (en) * | 2015-02-05 | 2015-05-27 | 蒋建军 | Heat pipe fin slices radiator |
Non-Patent Citations (1)
| Title |
|---|
| 液压驱动压裂泵大功率散热器设计与分析;张澜等;《石油矿场机械》;20151025(第10期);全文 * |
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