CN210548660U

CN210548660U - Fixing device of aluminum alloy thermal conductivity test rod

Info

Publication number: CN210548660U
Application number: CN201921602279.5U
Authority: CN
Inventors: 范卫忠; 高伟全; 闫俊
Original assignee: Huajin New Materials Research Institute Guangzhou Co ltd
Current assignee: Huajin New Materials Research Institute Guangzhou Co ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-05-19
Anticipated expiration: 2029-09-25

Abstract

The utility model discloses a fixing device of an aluminum alloy thermal conductivity test rod, which comprises a cylinder body, a mandril and a clamping mechanism of the test rod; the outer side wall of the cylinder body is provided with at least two planes which are parallel to each other and face opposite directions; one end of the cylinder body is provided with a test rod placing hole extending towards the inside of the cylinder body, and the ejector rod extends into the test rod placing hole from the other end of the cylinder body; the ejector rod is connected with the cylinder through a fine adjustment structure capable of adjusting the extending depth of the ejector rod; the clamping mechanism is arranged on the cylinder body. The utility model provides a fixing device of aluminum alloy thermal conductivity test stick is fixed steady to the test stick, and convenient extension length to the test stick carries out quick, accurate regulation, improves the preparation efficiency of laser flash method test sample.

Description

Fixing device of aluminum alloy thermal conductivity test rod

Technical Field

The utility model relates to a heat conductivity test field especially relates to a fixing device of experimental stick of aluminum alloy heat conductivity.

Background

The laser flash method is a common method for measuring the new heat-conducting energy of materials, and belongs to a transient method for heat-conducting test. The principle is that a laser source emits a beam of light pulse to irradiate the lower surface of a sample, so that the temperature of the surface layer of the sample is raised instantly after the surface layer absorbs light energy, and the surface layer is used as a hot end to transmit the energy to a cold end (upper surface) in a one-dimensional heat conduction mode. And continuously measuring the corresponding temperature rise process of the central part of the upper surface by using an infrared detector, and obtaining a relation curve of the temperature rise and the time.

At present, when the aluminum alloy material is subjected to a laser flash method test, a required sample is in a circular sheet shape, the diameter range of the sample is 12.6-15mm, and the thickness of the sample is about 2 mm. And the round flaky aluminum alloy sample is obtained by carrying out linear cutting on an aluminum alloy test rod by a linear cutting machine. However, because the aluminum alloy test rod is cylindrical, and the clamp on the wire cutting machine clamps the workpiece by using the two clamp blocks with the end surfaces parallel to each other, the test rod cannot be well fixed without a special clamp for the test rod, so that the sheet-shaped aluminum alloy sample obtained by wire cutting has uneven thickness and low accuracy of a test result. And after the test rod is cut partially, the test rod needs to be placed and fixed again, so that most of the test rod can be cut into samples as far as possible. At this time, the test rod needs to be repositioned, but because no special fixture is provided, the repositioning takes long time, and the working efficiency is low.

Wire cutting machines perform non-contact cutting by electrical sparking of a wire. However, since there is no special jig, the test bar may be displaced and touch the wire during the cutting process, thereby causing damage to the wire and requiring a long time for replacing the wire. In addition, because the last anchor clamps of wire cut electrical discharge machining are cliied the test stick after, the staff can't the axial displacement of accurate adjustment test stick, and the sample thickness of guaranteeing to cut out at every turn is 2mm to the sample that leads to cutting out has reduced the experimental accuracy of laser flash method.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fixing device of aluminum alloy thermal conductivity test stick is fixed surely to the test stick, and convenient extension length to the test stick carries out quick, accurate regulation, improves the preparation efficiency of laser flash method test sample.

In order to achieve the purpose, the utility model provides a fixing device of an aluminum alloy thermal conductivity test rod, which comprises a cylinder body, a mandril and a clamping mechanism of the test rod; the outer side wall of the cylinder body is provided with at least two planes which are parallel to each other and face opposite directions; one end of the cylinder body is provided with a test rod placing hole extending towards the inside of the cylinder body, and the ejector rod extends into the test rod placing hole from the other end of the cylinder body; the ejector rod is connected with the cylinder through a fine adjustment structure capable of adjusting the extending depth of the ejector rod; the clamping mechanism is arranged on the cylinder body.

As a further improvement, the fine setting structure is a threaded connection structure, be equipped with the external screw thread on the outer wall of ejector pin, the inboard of barrel is equipped with the screw hole, the external screw thread of ejector pin and the screw hole looks adaptation of barrel.

As a further improvement of the present invention, the threaded hole is disposed at an inner end of the barrel.

As a further improvement of the present invention, the ejector pin is a first bolt.

As a further improvement of the utility model, the clamping mechanism comprises a second bolt and a locking guide hole which are matched with each other in a threaded manner, and the locking guide hole passes through the side wall of the cylinder body and is vertical to the test rod placing hole; the top end of the screw rod of the second bolt penetrates through the locking guide hole and is positioned in the test rod placing hole.

As a further improvement, the clamping mechanism is arranged on the barrel body and is close to one side of the opening of the test rod placing hole.

As a further improvement of the present invention, the cylinder is prism-shaped, the cross section of the cylinder is a regular polygon, and the number of the edges of the regular polygon is an even number.

As a further improvement of the utility model, the diameter of the test rod placing hole is D, and D is more than or equal to 12.6mm and less than or equal to 15 mm; the minimum width of the cross section of the cylinder body is a, and a is more than or equal to 25 mm; the length of the cylinder body is L, and L is more than or equal to 50mm and less than or equal to 100 mm.

Advantageous effects

Compared with the prior art, the utility model discloses a fixing device of aluminum alloy thermal conductivity test stick's advantage does:

1. because be equipped with two at least planes that are parallel to each other and the orientation is opposite on the barrel lateral wall, the fixation clamp on the wire cut electrical discharge machining presses respectively on a pair of plane of barrel lateral wall, can press from both sides tight location to this fixing device, and the clamping mechanism on the rethread barrel fixes the test stick. Through the fixing device who adopts the experimental stick of thermal conductivity, need not to modify the anchor clamps on the current wire cut electrical discharge machining, the commonality is good. And, through adopting the fine setting structure, can the accurate degree of depth that the ejector pin stretched into the barrel to just also can place the ejecting length in hole and carry out the accurate regulation with the test stick from the test stick of barrel to the ejector pin, size control is accurate, then the slice aluminum alloy sample thickness that obtains through the wire-electrode cutting is even, is favorable to improving the degree of accuracy of heat conductivity test data. In addition, because the fixing clamp on the wire cutting machine can well clamp the cylinder body to prevent the cylinder body from sliding, when the wire cutting machine cuts the test rod through the electric spark of the metal wire, the test rod cannot be in direct contact with the metal wire due to sliding, the metal wire is prevented from being broken, the cutting continuity is ensured, and the replacement frequency of the metal wire is reduced.

2. The fine setting structure is threaded connection structure, and the external screw thread of ejector pin and the screw hole looks adaptation of barrel rotate relatively through making between ejector pin and the barrel to clamping mechanism on the cooperation barrel fixes the test stick, can control the test stick and stretch out the length that the hole was placed to the barrel test stick. The device has the advantages of simple structure, low equipment development cost and convenient operation.

3. The clamping mechanism comprises a second bolt and a locking guide hole which are arranged on the side wall of the cylinder body. The depth of the second bolt entering the locking guide hole is adjusted by rotating the second bolt, so that the end part of the second bolt is pressed or loosened to place the test rod in the hole on the cylinder test rod, the structure is simple, the manufacturing cost is low, and the operation is convenient and fast.

4. The cross section of the cylinder body is a regular polygon with even number of edges, so that the cylinder body can be clamped by a clamp of the wire cutting machine even when the cylinder body rotates to a plurality of different angles, the cylinder body does not need to be rotated to a unique angle to be clamped during operation, and the positioning is convenient.

The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings which illustrate embodiments of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a perspective view of a fixture for an aluminum alloy thermal conductivity test bar;

FIG. 2 is a cross-sectional exploded view of a fixture for an aluminum alloy thermal conductivity test bar;

FIG. 3 is a sectional view showing a state of use of a fixture for an aluminum alloy thermal conductivity test bar;

fig. 4 is a side view of a fixture for an aluminum alloy thermal conductivity test bar.

Detailed Description

Embodiments of the present invention will now be described with reference to the accompanying drawings.

Examples

The utility model discloses a concrete embodiment is as shown in fig. 1 to fig. 4, a fixing device of aluminum alloy thermal conductivity test stick, clamping mechanism including barrel 1, ejector pin 3 and test stick 7. At least two planes 11 which are parallel to each other and face opposite directions are arranged on the outer side wall of the cylinder 1. One end of the cylinder body 1 is provided with a test rod placing hole 2 extending towards the inside of the cylinder body, and the ejector rod 3 extends into the test rod placing hole 2 from the other end of the cylinder body 1. The ejector rod 3 is connected with the cylinder body 1 through a fine adjustment structure capable of adjusting the extending depth of the ejector rod 3. The clamping mechanism is arranged on the cylinder 1. The test rod placing hole 2 and the ejector rod 3 are coaxially arranged.

The fine setting structure is threaded connection structure, is equipped with external screw thread 31 on the outer wall of ejector pin 3, and the inboard of barrel 1 is equipped with screw hole 6, and the external screw thread 31 of ejector pin 3 and the screw hole 6 looks adaptation of barrel 1. A threaded hole 6 is provided at one end of the inside of the barrel 1. The ejector rod 3 is a first bolt which adopts a standard part.

In this embodiment, the clamping mechanism includes a second bolt 4 and a locking guide hole 5 which are in threaded fit with each other, and the locking guide hole 5 penetrates through the side wall of the barrel 1 and is perpendicular to the test rod placing hole 2. The screw tip of the second bolt 4 passes through the locking guide hole 5 and is positioned in the test stick placing hole 2. After the length that test stick 7 stretches out test stick placing hole 2 is adjusted well through ejector pin 3, through operation second bolt 4, make its screw rod top and test stick 7's lateral wall contact to compress tightly on test stick placing hole 2's inside wall, thereby realize pressing from both sides tightly test stick 7. The number of clamping mechanisms may be one or more. In this embodiment, clamping mechanism is two, including two second bolts 4, and two second bolts 4 are an contained angle each other, have further improved the clamping effect.

The clamping mechanism is arranged on one side of the barrel body 1 close to the opening of the test rod placing hole 2.

The barrel 1 is prismatic and has a cross-section of a regular polygon having an even number of edges, such as a square, a hexagon and an octagon. In this embodiment, the cross section of barrel 1 is the hexagon, can ensure that the area of contact of barrel 1 lateral wall and wire cut electrical discharge machining's anchor clamps is enough big, guarantees the steadiness after pressing from both sides tightly. In addition, the processing cost is lower than that of an octagonal cylinder, the number of clamping angles is larger than that of a quadrangular cylinder, and the operation is more convenient. Two second bolts 4 are respectively arranged on two adjacent planes 11 of the barrel 1. Furthermore, the two second bolts 4 may also be arranged on two oppositely directed planes 11 of the cylinder 1.

The diameter of the test rod placing hole 2 is D, and D is more than or equal to 12.6mm and less than or equal to 15 mm. The minimum width of the cross section of the cylinder 1 is a, and a is more than or equal to 25 mm. The length of the cylinder body 1 is L, and L is more than or equal to 50mm and less than or equal to 100 mm. In this embodiment, the minimum width a of the cross section of the cylinder 1 is 28mm, and the length L of the cylinder 1 is 80 mm.

During the use, earlier with 7 one ends of test stick stretch into the test stick of barrel 1 and place hole 2 and support at the top of ejector pin 3, then rotatory ejector pin 3 adjusts the degree of depth of ejector pin 3 in barrel 1 to adjust the length that test stick 7 exposes out of test stick placing hole 2. The second bolt 4 is rotated so that the tip end thereof presses the test rod 7 against the inner wall of the test rod placement hole 2. After the test rod 7 is fixed, the cylinder 1 is placed on a clamp of a wire cutting machine and clamped. The exposed end of the test rod 7 was cut into a sheet-like sample 71 by a wire cutting mechanism as a sample for the laser flash test. The sheet sample 71 had a thickness of 2 mm. After the wire cutting machine cuts the end part of the test rod 7 once to form a sample, an operator ejects the test rod 7 in the cylinder body 1 for 2mm by adjusting the ejector rod 3, and then performs wire cutting again. Because the ejector rod 3 is in threaded connection with the threaded hole 6 of the barrel body 1, the extension amount of the test rod 7 at each time can be accurately adjusted.

In addition to the above embodiment, the clamping mechanism of the cartridge 1 may be a clamp provided at the opening of the test stick placement hole 2.

The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to the above-disclosed embodiments, and various modifications, equivalent combinations, which are made according to the essence of the present invention, should be covered.

Claims

1. A fixing device for an aluminum alloy thermal conductivity test rod is characterized by comprising a cylinder body (1), an ejector rod (3) and a clamping mechanism of the test rod; the outer side wall of the cylinder body (1) is provided with at least two planes (11) which are parallel to each other and face opposite directions; one end of the cylinder body (1) is provided with a test rod placing hole (2) extending towards the inside of the cylinder body, and the ejector rod (3) extends into the test rod placing hole (2) from the other end of the cylinder body (1); the ejector rod (3) is connected with the cylinder body (1) through a fine adjustment structure capable of adjusting the extending depth of the ejector rod (3); the clamping mechanism is arranged on the cylinder body (1).

2. The fixing device for the aluminum alloy thermal conductivity test rod according to claim 1, wherein the fine adjustment structure is a threaded connection structure, an external thread (31) is arranged on the outer wall of the ejector rod (3), a threaded hole (6) is arranged on the inner side of the cylinder body (1), and the external thread (31) of the ejector rod (3) is matched with the threaded hole (6) of the cylinder body (1).

3. The fixing device of the aluminum alloy thermal conductivity test bar according to claim 2, wherein the threaded hole (6) is provided at one end of the inner side of the cylinder body (1).

4. The fixing device of the aluminum alloy thermal conductivity test bar according to claim 2, wherein the top rod (3) is a first bolt.

5. The fixing device of the aluminum alloy thermal conductivity test rod according to any one of claims 1 to 4, wherein the clamping mechanism comprises a second bolt (4) and a locking guide hole (5) which are in threaded fit with each other, and the locking guide hole (5) penetrates through the side wall of the barrel body (1) and is perpendicular to the test rod placing hole (2); the top end of the screw rod of the second bolt (4) passes through the locking guide hole (5) and is positioned in the test rod placing hole (2).

6. The fixing device for the aluminum alloy thermal conductivity test bar according to claim 5, wherein the clamping mechanism is arranged on one side of the cylinder body (1) close to the opening of the test bar placing hole (2).

7. The fixture for aluminum alloy thermal conductivity test bars as claimed in claim 1, wherein said cylinder (1) is prism-shaped with a cross section of regular polygon, and the number of edges of said regular polygon is even.

8. The fixing device for the aluminum alloy thermal conductivity test rod according to the claim 1, wherein the diameter of the test rod placing hole (2) is D, and D is more than or equal to 12.6mm and less than or equal to 15 mm; the minimum width of the cross section of the cylinder body (1) is a, and a is more than or equal to 25 mm; the length of the cylinder body (1) is L, and L is more than or equal to 50mm and less than or equal to 100 mm.