CN211317966U - Supporting die for steel pipe ring expansion test - Google Patents
Supporting die for steel pipe ring expansion test Download PDFInfo
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- CN211317966U CN211317966U CN201921985086.2U CN201921985086U CN211317966U CN 211317966 U CN211317966 U CN 211317966U CN 201921985086 U CN201921985086 U CN 201921985086U CN 211317966 U CN211317966 U CN 211317966U
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- wedge
- steel pipe
- top core
- pipe ring
- oval
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Abstract
The utility model discloses a steel pipe ring expands experimental support die belongs to material mechanics technical field. The die body is formed by a pair of symmetrical wedge-shaped dies, and the upper part and the lower part of each pair of wedge-shaped dies are rectangular end surfaces, narrow at the upper part and wide at the lower part; the top of the pair of wedge-shaped molds is provided with an oval groove, and the center of the pair of wedge-shaped molds is provided with an oval through hole; the long axis of the elliptical groove is larger than the diameter of the tail part of the top core; the minor axis of the elliptical groove is slightly smaller than the diameter of the head of the top core; the elliptical groove and the elliptical through hole are provided with transition slope angles, and the slope angles are equal to the conicity of the working surface of the top core; the utility model has the effects that: the test ring support device has the advantages that the test ring support effect is provided for the steel pipe ring expansion test, the problem that the sample ring or pipe section sample which is additionally taken is used as the support to waste raw materials during the test is solved, a plurality of sample rings can be simultaneously tested, and the working efficiency and the safety are improved.
Description
Technical Field
The utility model relates to a steel pipe ring expands experimental support die belongs to the material mechanics field. In particular to a separable steel pipe ring expansion test supporting die with an oval groove and an oval through hole and a working principle thereof.
Background
The ring expansion test is a test method for revealing defects on the surface of a metal pipe ring sample and in the wall of the pipe ring, and is used for evaluating the capability of the metal pipe ring to bear plastic deformation. The test is generally carried out using a sample ring having a length of 10mm to 16 mm. In the test, the conical top core working surface is usually placed on a test bed with the top, sample rings with the same specification are stacked on the top core working surface, and the uppermost sample ring is pressed down by a compression testing machine to expand the lower sample ring until the sample rings reach the required expansion rate or fracture. When the platform of the pressure tester is contacted with the end part of the top core, the platform cannot be pressed down continuously, and one or more sample rings on the platform cannot meet the test requirements.
At present, most of the laboratories in China adopt a method of additionally taking a plurality of sample rings or a long pipe section with the same specification as a test support. The method consumes materials, and when the sample ring is stacked too high, inclination is easy to generate, and potential safety hazards appear.
Disclosure of Invention
To the not enough in the prior art structure, the utility model aims at providing a steel pipe ring expands experimental support mould to practice thrift raw and other materials, improve work efficiency and consider the security as the principle, under the condition that does not purchase new installation, realize the ring and expand experimental safety, going on of efficiency.
In order to realize the purpose, the utility model discloses a technical scheme provide a steel pipe ring expands experimental support mould. Comprises a pair ofThe wedge-shaped die is suitable for the pipe with the external diameter phi of 60-150 mm. Wherein: the upper part and the lower part of the pair of wedge-shaped molds are rectangular end surfaces, and the upper part is narrow and the lower part is wide; the top of the pair of wedge-shaped molds is provided with an oval groove, and the center of the pair of wedge-shaped molds is provided with an oval through hole; the relation between the height h of the wedge-shaped die and the length l of the working surface of the top core is as follows: h is more than or equal to l; the long axis a of the elliptical groove and the tail diameter d of the test core rodmaxThe relationship of (1) is: a > dmax(ii) a The minor axis b of the elliptical groove is slightly smaller than the diameter d of the head of the coremin(ii) a The elliptical groove and the elliptical through hole are provided with excessive slope angles, the slope angles are equal to the taper of the working surface of the top core, and the angle of the taper of the working surface of the top core can be deduced to be 5.7 degrees according to a taper formula provided by the standard GB/T25047.
The beneficial effects of the utility model are that through the wedge type mould support of taking the oval groove, solved by adding more and get the extravagant raw and other materials problem of sample ring or pipeline section support and the risk factor that produces, can superpose a plurality of sample rings simultaneously and test, increased test efficiency.
Drawings
Fig. 1 is a schematic perspective view of the present invention;
FIG. 2 is a view showing the placement of a plurality of sample rings before the test of the present invention;
FIG. 3 is a front view of the sample ring of the present invention;
wherein:
A. conical top core B, sample rings C1 and C2, wedge-shaped die
D. Oval groove E with groove, oval through hole a and oval groove long axis
b. Minor axis d of the elliptical groovemaxDiameter d of the tail of the top coreminDiameter of head of core
l, length h of working surface of top core and height of wedge-shaped die
Detailed Description
The steel pipe ring expansion test supporting die of the utility model is explained by combining the attached drawings and the embodiment.
As shown in fig. 1, the steel pipe ring expansion test supporting die comprises a pair of wedge-shaped dies.
The pair of wedge-shaped dies is suitable for the outer diameter phi of a pipe of 60-150 mm, the upper portion and the lower portion of each wedge-shaped die are rectangular end faces, the upper portion and the lower portion of each wedge-shaped die are narrow and wide, the upper end face can be 160mm × 160mm, the lower end face can be 160mm × 200mm, the top portion of each wedge-shaped die is provided with an elliptical groove, the center of each wedge-shaped die is provided with an elliptical through hole, the elliptical groove and the elliptical through hole are provided with an excessive slope angle, the slope angle can be 5-6 degrees, the slope angle is equal to the taper of a working face of a top core, the transition smooth effect of the top core and the wedge-shaped dies is achieved, the relation between the height h of the wedge-shaped dies and the length l of the working face of the top core is that h is larger than or equal to l, the height h of the wedge-shaped dies can be 150maxThe relationship of (1) is: a > dmaxThe long axis a can be 150-160 mm, and the function of the long axis a is to ensure that the top core is in contact with the sample ring and not in contact with the long axis of the wedge-shaped die, so as to ensure the expansion space of the sample ring; the minor axis b of the elliptical groove is slightly smaller than the diameter d of the head of the coreminThe minor axis b can adopt 50mm ~ 55mm, and the effect is that the ejector core contacts with sample ring and elliptical groove minor axis b simultaneously, and wedge type mould can separate gradually along with impressing of ejector core when guaranteeing sample ring expansion, simultaneously, because the laminating effect of ejector core working face and slope, the wedge type mould can not inwards be emptyd to, elliptical groove minor axis direction and sample ring effective area of contact are enough to support and are tested. If the diameter of the head of the ejector core is larger, the wedge-shaped die can be slightly adjusted and separated, so that the ejector core can smoothly enter.
Before the test, the test piece is placed as shown in figure 2, so that the sample ring is completely embedded into the top core, and the working surface of the top core is contacted with the minor axis direction of the elliptical groove and a gap is reserved between the working surface of the top core and the major axis direction. During the test, the top core is slowly pressed down along the slopes of the elliptical groove and the elliptical through hole. While the sample ring was expanded, the wedge mold was gradually separated until the end of the test.
Claims (6)
1. The utility model provides a steel pipe ring expands experimental mould that supports, characterized by: this support mould body is formed by wedge type mould (C1) and (C2) of a pair of symmetry, and wedge type mould (C1) and (C2) inside central authorities are formed with oval through-hole (E), oval through-hole (E) are equipped with oval groove (D) on the top, oval groove (D) with oval through-hole (E) have excessive bank angle.
2. The supporting die for the steel pipe ring expansion test according to claim 1, wherein: the upper part and the lower part of the wedge-shaped die body are rectangular end surfaces, and the upper part is narrow and the lower part is wide.
3. The supporting die for the steel pipe ring expansion test according to claim 1, wherein: the relation between the height h of the wedge-shaped die body and the length l of the working surface of the top core (A) is that h is more than or equal to l.
4. The supporting die for the steel pipe ring expansion test according to claim 1, wherein: the long axis a of the elliptical groove (D) and the tail diameter D of the top core (A)maxIs a > dmax。
5. The supporting die for the steel pipe ring expansion test according to claim 1, wherein: the minor axis b of the elliptical groove (D) is smaller than the diameter D of the head of the top core (A)min。
6. The supporting die for the steel pipe ring expansion test according to claim 1, wherein: the elliptical groove (D) and the elliptical through hole (E) have excessive slope angles equal to the taper of the working surface of the top core (A), and the taper of the working surface of the top core is 5.7 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921985086.2U CN211317966U (en) | 2019-11-18 | 2019-11-18 | Supporting die for steel pipe ring expansion test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921985086.2U CN211317966U (en) | 2019-11-18 | 2019-11-18 | Supporting die for steel pipe ring expansion test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211317966U true CN211317966U (en) | 2020-08-21 |
Family
ID=72078631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921985086.2U Active CN211317966U (en) | 2019-11-18 | 2019-11-18 | Supporting die for steel pipe ring expansion test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211317966U (en) |
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2019
- 2019-11-18 CN CN201921985086.2U patent/CN211317966U/en active Active
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