CN202845478U - Drawing mold of rectangular flat steel tube - Google Patents
Drawing mold of rectangular flat steel tube Download PDFInfo
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- CN202845478U CN202845478U CN 201220543107 CN201220543107U CN202845478U CN 202845478 U CN202845478 U CN 202845478U CN 201220543107 CN201220543107 CN 201220543107 CN 201220543107 U CN201220543107 U CN 201220543107U CN 202845478 U CN202845478 U CN 202845478U
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- flat steel
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Abstract
The utility model discloses a drawing mold of a rectangular flat steel tube, and the drawing mold does not need to be revised and is capable of guaranteeing precision and surface evenness of the rectangular flat steel tube. The drawing mold comprises a mold body, wherein a drawing mold hole of the mold body comprises an entrance section, a transition section and a sizing section, the sizing section comprises a pair of flat and straight short surfaces, a pair of arc-shaped long surfaces and four corner arc surfaces, and the corner arc surfaces are connected with the flat and straight short surfaces and the arc-shaped long surfaces; the transition section comprises four transition inclined surfaces and four transition section corner curved surfaces, the transition inclined surfaces are engaged with the flat and straight short surfaces and the arc-shaped long surfaces, and the transition section corner curved surfaces are connected with the transition inclined surfaces which are close to each other two by two; and the entrance section comprises four outward-protruded lead-in curved surfaces and entrance corner curved surfaces, the outward-protruded lead-in curved surfaces are engaged with the corresponding transition inclined surfaces, the entrance corner curved surfaces are connected with the lead-in curved surfaces which are close to each other two by two, the four lead-in curved surfaces are all quadric surfaces, and the opposite lead-in curved surfaces are symmetrically distributed. The drawing mold of the rectangular flat steel tube is used for changing a circular steel tube into the rectangular flat steel tube by cold drawing.
Description
Technical field
The utility model relates to the stretching die in the Metal Forming technical field, refers more particularly to the stretching die that round steel pipe is drawn into the rectangle Flat steel pipe.
Background technology
Important fixture component when drawing die is cold drawing steel tube production has been widely used in the steel pipe reducing or/and in the production process of distortion.Utilize stretching die that steel pipe is carried out cold drawn forming, have the stock utilization height, energy consumption is low, properties of product are good, production efficiency is high, the characteristics such as with low cost.In the drawing die, the different tubing shape by its drawing moulding is divided into again conventional drawing die and heterotypic stretching mould, and what be used for cold-drawn special-shaped tubing is heterotypic stretching mould (also claiming special-shaped stretching die); Have linerless core to come minute by it, be divided into again empty sinking stretching die and lining core drawing die, the larger set of specifications of draw apart from the time because Drawing Force is huge, can only adopt the empty sinking stretching die.
At present, no matter the stretching die of flat steel pipe (in the special-shaped stretching die a kind of) is empty sinking stretching die or lining core drawing die, all has following defective:
1, because the entrance circular arc pattern of the cross section of flat steel pipe and mould is tending towards complicated, the material of flat steel pipe drawing die is very restricted.Generally, specification is larger selects conventional 45# mould steel, less high-carbon alloy steel Cr12 material or the carbide alloy W-Co kind YG series selected.Because drawing die is after Overheating Treatment, sizing section and entrance circular arc produce deformation, although the sizing section of mould and the deformation of entrance circular arc are limited, but when steel pipe drawing, when metal produces horizontal sliding, be subjected to the mould influence of crust deformation, the coefficient of the distortion of steel pipe is far longer than the deformation coefficient of mould, and no longer be 1: 1 relation, thereby cause the stretched mould cold-drawn of steel pipe back plane degree depression serious; And, be subject to flat drawing die type structure impact (long outlying much larger than minor face), the steel pipe pipe is when producing deformation through the flat drawing die, there are the larger phenomenon of drop in pressure all around and frictional force, long limit pressure is far longer than the minor face pressure, therefore by the flat steel pipe behind the drawing die, always there is the serious phenomenon of depression degree on long limit.Precision and surface smoothness through the flat steel pipe of drawing moulding all can't reach designing requirement.
2,45# steel drawing die is after the Overheating Treatment carburizing, and sizing section and entrance circular arc produce deformation, usually all adopts the way of revising drawing die to obtain former design size.During correction, because generally between 0.8～1.0mm, below the degree of depth, the matrix hardness of steel, intensity and wearability are relatively poor at this for this material drawing die carburized (case) depth, thereby cause revised die surface hardness to descend, can't satisfy the case hardness designing requirement of drawing die.When adopting revised mould drawing flat steel pipe, frictional force can increase between steel pipe and the mould, and the surface of steel pipe can be damaged in the surface of mould, so that the flat steel tube surface after the moulding occurs pulling and draws the defectives such as silk.And, because the lower hardness on drawing die surface has shortened the mold use life-span greatly.
3, high-carbon alloy steel Cr12 material drawing die is after Overheating Treatment, and sizing section and entrance circular arc produce deformation, usually all adopts the way of revising drawing die to obtain former design size.During correction, because this material belongs to little distortion, high carbon alloy mould steel, the inside and outside hardness of mold materials, intensity, wearability are basically identical, so can not adopt the machining mode correction, can only rely on the manual type correction, working strength is high, difficulty is larger so that revise, and inefficiency.
In addition, find also in the production process of utilizing drawing die drawing flat steel pipe that when adopting the empty sinking drawing die that steel pipe is carried out draw, do not support owing to serve as a contrast core (internal mold) in the empty sinking drawing die, the depression degree of flat steel pipe is more serious.
The utility model content
Technical problem to be solved in the utility model is: the stretching die that does not need after a kind of heat treatment to revise and can guarantee the rectangle Flat steel pipe of the precision of rectangle Flat steel pipe and surface smoothness is provided.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: the stretching die of rectangle Flat steel pipe comprises: die ontology, offer draw hole on the die ontology, and this draw hole comprises entrance, changeover portion, the sizing section that links to each other successively;
Sizing section comprises: respectively with the minor face of rectangle Flat steel pipe cross-sectional profiles, long limit with is connected the corresponding a pair of straight short face of the corner circular arc on short, long limit, the long face of a pair of arc and the corner arc surfaces of four straight short faces of connection and the long face of arc, the summit of the long face of described arc is 3～5 ‰ of rectangle Flat steel pipe thickness to the air line distance on the plane, a pair of end line place of the long face of this arc;
Described changeover portion comprises: four transition inclined-planes that are connected mutually with the long face with arc of straight short face and four are connected the in twos changeover portion corner curved surface on adjacent transition inclined-plane, angle between the respective face of transition inclined-plane and sizing section is 3～4 °, the midpoint of the long face of the arc of sizing section and the linking boundary line on the transition inclined-plane that is attached thereto is provided with the surface and is the long face depression of ellipsoid, the major semiaxis of long face depression upper edge hole be rectangle Flat steel pipe cross-sectional profiles long limit 2/3 to 3/4, the length of long face depression upper edge hole, the ratio of semi-minor axis is 3: 1～1.5, and the degree of depth of long face depression is 0.8～1% of rectangle Flat steel pipe wall thickness;
Described entrance comprises: four cambered outwards importing curved surfaces that are connected mutually with corresponding transition inclined-plane respectively and be connected the in twos entrance corner curved surface of adjacent importing curved surface, four import curved surface and are quadratic surface, relative importing curved surface is arranged symmetrically with, the axial subsequent corrosion that imports curved surface equals this distance that imports between the outer bead summit of curved surface is deducted with this to the ultimate range between relative two faces that import the corresponding sizing section of curved surface, divided by being four times in this importing curved surface, the outer opening's edge the square value of the line of two axial end points and the angle sine between the axis; The circumferential subsequent corrosion that imports curved surface equal to hang down 0.9～1.15 times of distance between two summits that are cut in above-mentioned axial curved surface.
Described die ontology also is provided with the nib that communicates with sizing section in the outside of sizing section, form the outlet section of draw hole, this outlet section comprises: four outlet inclined-planes that are connected mutually with the long face with arc of straight short face and four are connected the in twos outlet corner curved surface on adjacent outlet inclined-plane.
Described outlet section, sizing section, changeover portion and entrance account for separately described die ontology thickness 4～5%, 24～26%, 8～10% and 60～64%.
Angle between the respective face of described outlet inclined-plane and sizing section is 30～45 °.
The midpoint of the linking boundary line on the straight short face of described sizing section and the transition inclined-plane that is attached thereto is provided with the surface and is the short face depression of ellipsoid, the major semiaxis of short face depression upper edge hole be rectangle Flat steel pipe cross-sectional profiles minor face 2/3 to 3/4, the ratio of the long and short semiaxis of short face depression upper edge hole is 3: 1～1.5, and the degree of depth of short face depression is 0.8～1% of rectangle Flat steel pipe wall thickness.
Be provided with smooth transition surface between described sizing section and the changeover portion.
The radius of described smooth transition surface is 0.8～0.9 of sizing section length.
The beneficial effects of the utility model are: being arranged on the long face of arc of sizing section and the surface of the midpoint of the linking boundary line on the transition inclined-plane that is attached thereto is the long face depression of ellipsoid, can offset that sizing section and entrance circular arc produce outside deformation in the heat treatment process, thereby the stretching die that obtains need not be revised, both reduced cost of manufacture, guaranteed again the hardness of die surface, pressure and the frictional force of limit face when effectively having reduced steel pipe deformation ensure steel pipe deformation smooth transition.The structure of described sizing section, changeover portion and entrance can satisfy the requirement of described rectangle Flat steel pipe shape and size, and, prevented that also the long limit of flat steel pipe from producing depression, obtain the high precision plane Flat steel pipe; In addition and since in the arranged outside of sizing section outlet section, to the outer interruption-forming protection of sizing section, prolonged the service life of described stretching die, and so that the stability of Flat steel pipe precision has obtained effective guarantee; In addition, be arranged on the moderate smooth transition surface of radian between sizing section and the changeover portion, can further reduce wear, prolong the service life of described stretching die, improve the quality of rectangle Flat steel pipe.
Description of drawings
Fig. 1 is the structural representation of cold-drawn mould described in the utility model.
Fig. 2 is the longitudinal cutting structure schematic diagram of Fig. 1.
Fig. 3 is the schematic diagram of cross cut structure transposition 90 degree of Fig. 1
Fig. 4 is that the structure for amplifying signal of K part among Fig. 1 is schemed.
Fig. 5 is that the structure for amplifying signal of J part among Fig. 2 is schemed.
Fig. 6 is the cross sectional representation that adopts the rectangle Flat steel pipe that stretching die described in the utility model pulls into.
Among Fig. 1 to Fig. 6: 1, die ontology, 11, first imports curved surface, and 12, second imports curved surface, and 13, line, 21, First Transition inclined-plane, the 22, second transition inclined-plane, 31, straight short face, 32, the long face of arc, the 41, first outlet inclined-plane, the 42, second outlet inclined-plane; I, entrance, II, changeover portion, III, sizing section, IV, outlet section.
The specific embodiment
Below in conjunction with accompanying drawing, describe specific embodiments described in the utility model in detail.
Such as Fig. 1, Fig. 2 and shown in Figure 3, the stretching die of rectangle Flat steel pipe described in the utility model, comprise: die ontology 1, offer on the die ontology 1 and comprise: entrance I, the changeover portion II that links to each other successively and the draw hole of sizing section III and outlet section IV, outlet section IV, sizing section III, changeover portion II and entrance I account for separately die ontology 1 thickness 4.5%, 25%, 9% and 61.5%; Sizing section III comprises: respectively with minor face, the long limit of the cross-sectional profiles of rectangle Flat steel pipe 8 shown in Figure 6 with is connected the corresponding long face 32 of a pair of straight short face 31, a pair of arc of the corner circular arc on short, long limit and the corner arc surfaces of four straight short faces 31 of connection and the long face 32 of arc, the summit of the long face 32 of arc is 3～5 ‰ of rectangle Flat steel pipe thickness to the air line distance H2 on the plane, a pair of end line place of the long face of this arc---referring to shown in Figure 4; Described changeover portion II comprises the second transition inclined-plane 22 and four changeover portion corner curved surfaces that are connected First Transition inclined-plane 21 and the second transition inclined-plane 22 that two First Transition inclined-planes 21 that are connected mutually with straight short face 31 respectively, two are connected mutually with the long face 32 of arc respectively, angle α between the respective face of First Transition inclined-plane 21 and the second transition inclined-plane 22 and sizing section III is 3～4 °---referring to shown in Figure 5, be provided with smooth transition surface 23 between sizing section III and the changeover portion II, the radius of smooth transition surface 23 is 0.8～0.9 of sizing section III length; As shown in Figure 3, the long face 32 of two arcs of sizing section III and the midpoint of the linking boundary line on corresponding the second transition inclined-plane 22 that links to each other with it are respectively arranged with the surface and are the long face of the ellipsoid M that caves in, the major semiaxis of the upper edge hole of long face depression M be rectangle Flat steel pipe 8 cross-sectional profiles long limit 2/3 to 3/4, the ratio of the long and short semiaxis of the upper edge hole of long face depression M is 3: 1～1.5, and the degree of depth of long face depression M is 0.8～1% of rectangle Flat steel pipe 8 wall thickness; Described entrance I comprises: two cambered outwards first import curved surface 11 with corresponding First Transition inclined-plane 21 is connected mutually respectively, two cambered outwards second import curved surface 12 and four and are connected the first entrance corner curved surfaces that import curved surface 11 and the second importing curved surface 12 with corresponding the second transition inclined-plane 22 is connected mutually respectively, two first import curved surface 11 and second and import curved surface 12 and be quadratic surface, and, two first import curved surface 11 and are arranged symmetrically with, two second import curved surface 12 and are arranged symmetrically with, the axial subsequent corrosion that the first importing curved surface 11 and second imports curved surface 12 is identical with the computational methods of circumferential subsequent corrosion, import curved surface 11 as example take first, as shown in Figure 3, the first axial subsequent corrosion R1 that imports curved surface 11 equals this and imports distance H 4 between the outer bead summit of curved surface 11 to first and deduct with this first ultimate range H3 that imports between relative two faces of the corresponding sizing section III of curved surface 11, divided by be four times in first import curved surface 11 in, the outer opening's edge the square value of the line 13 of two axial end points and the angle β sine between the axis, that is: R1=(H4-H3) ÷ (4 * Sin
2β); Its circumferential subsequent corrosion equal to hang down 0.9～1.15 times of distance H 1 between two summits be cut in above-mentioned axial curved surface.In the present embodiment, the midpoint of the linking boundary line on a pair of straight short face 31 of described sizing section III and the First Transition inclined-plane 21 that is attached thereto is respectively arranged with the surface and is the short face depression L of ellipsoid, the major semiaxis of short face depression L upper edge hole be rectangle Flat steel pipe 8 cross-sectional profiles minor face 2/3 to 3/4, the ratio of the long and short semiaxis of short face depression L upper edge hole is 3: 1～1.5,0.8～1% of the degree of depth rectangle Flat steel pipe wall thickness of short face depression L; Described outlet section IV comprises: two the first outlet inclined-planes 41 that are connected mutually with a pair of straight short face 31 respectively, two are connected the outlet corner curved surfaces that the first outlet inclined-plane 41 and second exports inclined-plane 42 with the second outlet inclined-plane 42 and four that the long face 32 of a pair of arc is connected mutually respectively, and the described first angle that exports between the respective face that inclined-plane 41 and second exports inclined-plane 42 and sizing section III is 30～45 °.
Claims (7)
1. the stretching die of rectangle Flat steel pipe, comprising: die ontology is characterized in that: offer draw hole on the described die ontology, this draw hole comprises entrance, changeover portion, the sizing section that links to each other successively;
Sizing section comprises: respectively with the minor face of rectangle Flat steel pipe cross-sectional profiles, long limit with is connected the corresponding a pair of straight short face of the corner circular arc on short, long limit, the long face of a pair of arc and the corner arc surfaces of four straight short faces of connection and the long face of arc, the summit of the long face of described arc is 3～5 ‰ of rectangle Flat steel pipe thickness to the air line distance on the plane, a pair of end line place of the long face of this arc;
Described changeover portion comprises: four transition inclined-planes that are connected mutually with the long face with arc of straight short face and four are connected the in twos changeover portion corner curved surface on adjacent transition inclined-plane, angle between the respective face of transition inclined-plane and sizing section is 3～4 °, the midpoint of the long face of the arc of sizing section and the linking boundary line on the transition inclined-plane that is attached thereto is provided with the surface and is the long face depression of ellipsoid, the major semiaxis of long face depression upper edge hole be rectangle Flat steel pipe cross-sectional profiles long limit 2/3 to 3/4, the length of long face depression upper edge hole, the ratio of semi-minor axis is 3:1～1.5, and the degree of depth of long face depression is 0.8～1% of rectangle Flat steel pipe wall thickness;
Described entrance comprises: four cambered outwards importing curved surfaces that are connected mutually with corresponding transition inclined-plane respectively and be connected the in twos entrance corner curved surface of adjacent importing curved surface, four import curved surface and are quadratic surface, relative importing curved surface is arranged symmetrically with, the axial subsequent corrosion that imports curved surface equals this distance that imports between the outer bead summit of curved surface is deducted with this to the ultimate range between relative two faces that import the corresponding sizing section of curved surface, divided by being four times in this importing curved surface, the outer opening's edge the square value of the line of two axial end points and the angle sine between the axis; The circumferential subsequent corrosion that imports curved surface equal to hang down 0.9～1.15 times of distance between two summits that are cut in above-mentioned axial curved surface.
2. the stretching die of rectangle Flat steel pipe as claimed in claim 1, it is characterized in that: described die ontology also is provided with the nib that communicates with sizing section in the outside of sizing section, form the outlet section of draw hole, this outlet section comprises: four outlet inclined-planes that are connected mutually with the long face with arc of straight short face and four are connected the in twos outlet corner curved surface on adjacent outlet inclined-plane.
3. the stretching die of rectangle Flat steel pipe as claimed in claim 2 is characterized in that: described outlet section, sizing section, changeover portion and entrance account for separately described die ontology thickness 4～5%, 24～26%, 8～10% and 60～64%.
4. the stretching die of rectangle Flat steel pipe as claimed in claim 2, it is characterized in that: the angle between the respective face of described outlet inclined-plane and sizing section is 30～45 °.
5. the stretching die of rectangle Flat steel pipe as claimed in claim 1, it is characterized in that: the midpoint of the linking boundary line on the straight short face of described sizing section and the transition inclined-plane that is attached thereto is provided with the surface and is the short face depression of ellipsoid, the major semiaxis of short face depression upper edge hole be rectangle Flat steel pipe cross-sectional profiles minor face 2/3 to 3/4, the ratio of the long and short semiaxis of short face depression upper edge hole is 3:1～1.5, and the degree of depth of short face depression is 0.8～1% of rectangle Flat steel pipe wall thickness.
6. such as the stretching die of each described rectangle Flat steel pipe in the claim 1 to 5, it is characterized in that: be provided with smooth transition surface between described sizing section and the changeover portion.
7. the stretching die of rectangle Flat steel pipe as claimed in claim 6, it is characterized in that: the radius of described smooth transition surface is 0.8～0.9 of sizing section length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220543107 CN202845478U (en) | 2012-10-22 | 2012-10-22 | Drawing mold of rectangular flat steel tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220543107 CN202845478U (en) | 2012-10-22 | 2012-10-22 | Drawing mold of rectangular flat steel tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202845478U true CN202845478U (en) | 2013-04-03 |
Family
ID=47976714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220543107 Withdrawn - After Issue CN202845478U (en) | 2012-10-22 | 2012-10-22 | Drawing mold of rectangular flat steel tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202845478U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873119A (en) * | 2012-10-22 | 2013-01-16 | 江苏华程工业制管股份有限公司 | Drawing die for rectangular flat steel tube |
| CN109201766A (en) * | 2018-10-17 | 2019-01-15 | 石家庄龙兴新材料科技有限公司 | Essence for processing slip sheet of air conditioner compressor pulls out band steel and preparation method thereof |
-
2012
- 2012-10-22 CN CN 201220543107 patent/CN202845478U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873119A (en) * | 2012-10-22 | 2013-01-16 | 江苏华程工业制管股份有限公司 | Drawing die for rectangular flat steel tube |
| CN102873119B (en) * | 2012-10-22 | 2014-05-14 | 江苏华程工业制管股份有限公司 | Drawing die for rectangular flat steel tube |
| CN109201766A (en) * | 2018-10-17 | 2019-01-15 | 石家庄龙兴新材料科技有限公司 | Essence for processing slip sheet of air conditioner compressor pulls out band steel and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130403 Effective date of abandoning: 20140514 |
|
| RGAV | Abandon patent right to avoid regrant |