CN108662999A - A kind of creep properties test device for being glued cylinder - Google Patents

Abstract

The invention discloses a creep characteristic testing device of a glued cylinder, which is used for measuring the creep displacement of a cylindrical glued structure under the action of an axial force or a radial force. Including: bottom plate, bracket, counterweight, non-contact displacement sensor and adapter plate; the measurement specimen is a glued cylinder, including the outer cylinder, the inner cylinder set inside the outer cylinder, and the inner circumference of the outer cylinder and the outer surface of the inner cylinder The glue layer between the circumferential surfaces is used to glue two cylinders together. The measurement specimen is placed on the bottom plate. When performing the creep displacement test under the action of radial force, the measurement specimen is placed on the bottom plate through the support block, and the counterweight is used to apply axial or radial load to the glued cylinder. Non-contact displacement transducers measure the creep displacement of bonded cylinders under axial or radial forces.

Description

A test device for creep characteristics of glued cylinders

technical field

The invention relates to a creep characteristic test device, in particular to a creep characteristic test device of a glued cylinder, which belongs to the field of manufacturing quality prediction and control.

Background technique

In the assembly process of precision instrument parts, epoxy resin glue is often used to bond metal parts. Under the temperature condition of 0-100 ℃, these epoxy resin adhesives will produce relatively obvious creep phenomenon, which will affect the relative position between parts. Since most of the parts in the instrument belong to the shaft-hole fit, the gap between precision parts is very small, generally around a few microns to tens of microns, which will result in a very thin adhesive layer between the parts. According to estimates, within 24 hours The micro-creep displacement that can be produced is about 5 μm, which is called micro-creep.

At present, the micro-creep test method for mechanical structures is aimed at the creep behavior test of metal materials at high temperatures. High-temperature strain gauges are pasted on the parts to be measured, and the expansion and contraction of the sensitive grid of the strain gauge is converted into the two ends of the sensitive grid. The voltage changes, so as to measure the deformation of the part, and then obtain the change of creep. The accuracy of the above method to test the displacement is at the sub-millimeter level, and the result is not very accurate. In the process of studying the assembly of precision instrument parts, the influence of micro-creep on the position and orientation of the parts has reached a non-negligible level, but the existing test methods cannot measure the micro-creep displacement of parts with precision cylindrical adhesive structures over time. change relationship.

Contents of the invention

In view of this, the present invention provides a creep characteristic testing device of a glued cylinder, which can obtain the creep displacement of the cylindrical glued structure under the action of an axial force or a radial force, and by using a high-precision non-contact Type displacement sensor, which can test the micro-creep displacement of parts with precision cylindrical adhesive structure.

The invention provides a creep characteristic testing device of a glued cylinder. The glued cylinder is used as a test specimen, including: an outer cylinder, an inner cylinder set inside the outer cylinder, and an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder. The adhesive layer used to glue the two cylinders together; the test device includes: a base plate, a bracket, a counterweight, a non-contact displacement sensor and an adapter plate;

The test specimen is placed on the base plate, and the axial direction of the test specimen is perpendicular to the base plate; one end of the bracket is fixedly connected to the base plate, and an adapter plate is installed at the other end; the non-contact displacement sensor is installed on On the side of the adapter plate, the counterweight located on the top of the test piece is used to apply an axial load to the test piece, and the surface of the counterweight opposite to the non-contact displacement sensor is a plane, as A measuring surface; by testing the displacement of the measuring surface, the creep displacement of the glued cylinder under the axial force is tested.

In addition, the present invention provides another creep characteristic test device of a glued cylinder, the glued cylinder is used as a test specimen, including an outer cylinder, an inner cylinder fitted inside the outer cylinder, and an inner cylinder located on the inner peripheral surface of the outer cylinder and outside the inner cylinder. The adhesive layer used to bond two cylinders together between the circumferential surfaces; the test device includes: a bottom plate, a bracket, a counterweight, a non-contact displacement sensor, an adapter plate and a support block;

A plane is processed on the outer circumferential surface of the inner cylinder in the test specimen as the measuring surface;

The test specimen is placed on the base plate through the support block, and the axial direction of the test specimen is guaranteed to be in a horizontal state through the support block, and the measurement surface is opposite to the non-contact displacement sensor; one end of the support It is fixedly connected with the bottom plate, and an adapter plate is installed at the other end; the non-contact displacement sensor is installed on the side of the adapter plate, and the counterweight is used to apply a radial load to the test specimen. The displacement of the measuring surface is used to test the creep displacement of the glued cylinder under radial force.

Beneficial effect:

The device uses a non-contact displacement sensor to test the creep displacement of the cylindrical bonded structure under the action of axial force or radial force, which can ensure the test accuracy and is suitable for micro-creep of parts with precision cylindrical bonded structures displacement test

Description of drawings

Fig. 1 is the structural representation of measuring device in embodiment 1;

Fig. 2 is the structural representation of test specimen in embodiment 1;

Fig. 3 is the structural representation of inner cylinder in embodiment 1;

Fig. 4 is the structural representation of outer cylinder in embodiment 1;

Fig. 5 is the structural representation of measuring device in embodiment 2;

Fig. 6 is the structural representation of test specimen in embodiment 2;

Fig. 7 is the structural representation of inner cylinder in embodiment 2;

FIG. 8 is a schematic structural view of the outer cylinder in Embodiment 2.

Among them: 101/201-bottom plate, 102/202-bracket, 103/203-test specimen, 104/204-counterweight, 105/205-non-contact displacement sensor, 106/106-adapter board, 107/207 -inner cylinder, 108/208-outer cylinder, 109/209-adhesive layer, 110-clip, 210-support block, 211-measurement surface

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Example 1:

This embodiment provides a creep characteristic testing device for a precision glued cylinder, through which the creep displacement of the cylindrical glued structure under the action of an axial force can be measured.

As shown in FIG. 1 , the test device includes: a bottom plate 101 , a bracket 102 , a counterweight 104 , a non-contact displacement sensor 105 and an adapter plate 106 .

The test piece 103 is two hollow cylinders coaxially glued together, as shown in Figures 2-4, including: an outer cylinder 108, an inner cylinder 107 coaxially fitted inside the outer cylinder 108, and an inner circumference of the outer cylinder 108 The adhesive layer 109 in the annular cavity between the surface and the outer peripheral surface of the inner cylinder 107 is used to glue the two cylinders together coaxially. The relative positions of the outer peripheral surface of the inner cylinder 107 and the inner peripheral surface of the outer cylinder 108 are respectively provided with annular protrusions as bonding surfaces. 110.

The overall connection relationship of the test device is as follows: the base plate 101 is a rectangular flat plate, and one end of the test piece 103 axially provided with a snap ring 110 is placed on the upper surface of the base plate 101, wherein the bottom end surface of the outer cylinder 108 is in contact with the base plate 101, and the bottom of the inner cylinder 107 There is a gap between the end surface and the bottom plate 101 . The bracket 102 is an L-shaped rod, one end of which is fixedly connected to the bottom plate 101 , and the other end is installed with a miniature clamp for clamping the adapter plate 106 . The non-contact displacement sensor 105 is fixed on the side of the adapter plate 106 , and the non-contact displacement sensor 105 is located directly above the test piece 103 . In order to realize the measurement of the micro-creep of precision bonded cylinders, the non-contact displacement sensor 105 is a high-precision displacement sensor (accuracy is at least micron level), which can be a non-contact displacement sensor such as a laser sensor, an infrared sensor, an ultrasonic sensor, etc. . The counterweight 104 is used to axially load the adhesive layer 109. In this embodiment, the gravity of the counterweight 104 acts on the axial end surface of the inner cylinder 107 to realize indirect loading on the adhesive layer 109, specifically: the shape of the counterweight 104 It can be cylindrical, square or other symmetrical shapes to ensure that the gravity load on the test specimen 103 will not be skewed. In this embodiment, the counterweight 104 includes a cylindrical counterweight and a square counterweight, wherein the cylindrical counterweight is clamped on the axial end surface of the inner cylinder 107 by the snap ring 110 at the end of the inner cylinder 107 of the test piece 103, Axial load is applied to the inner cylinder 107, the square counterweight is placed on the upper surface of the cylindrical counterweight, the upper surface of the square counterweight is used as the measurement surface parallel to the horizontal plane, and the upper surface of the counterweight 104 is located in the measurement range of the non-contact displacement sensor 105 Within, the creep displacement of the adhesive layer 109 in the cylindrical adhesive structure under the axial force is tested by testing the displacement of the counterweight 104 . In order to test the creep characteristics under different loads, multiple sets of square counterweights can be arranged above the square counterweights.

Example 2:

This embodiment provides a creep characteristic test device for measuring the creep displacement of a precision glued cylinder under the action of a radial force.

As shown in FIG. 5 , the test device includes: a bottom plate 201 , a bracket 202 , a counterweight 204 , a non-contact displacement sensor 205 , an adapter plate 206 and a support block 210 .

In this embodiment, the test piece 203 is shown in Figures 6-8, including: an outer cylinder 208, an inner cylinder 207 coaxially sleeved inside the outer cylinder 208, and an inner cylinder 207 located between the inner circumference of the outer cylinder 208 and the outer circumference of the inner cylinder 207. The adhesive layer 209 used for coaxially bonding the two cylinders together in the annular cavity between them. Wherein the outer peripheral surface of the inner cylinder 207 is a stepped surface with a larger diameter in the middle and a smaller diameter at both ends, and the middle part of the outer peripheral surface and the inner peripheral surface of the outer cylinder 208 are respectively provided with annular protrusions as bonding surfaces. A glue layer 209 is arranged between the two annular protrusions. A plane is processed on the outer peripheral surface of one end of the inner cylinder 207 as the measuring surface 211 .

The overall connection relationship of the test device is: the base plate 201 is a rectangular flat plate, and the support block 210 for supporting the test specimen 203 is placed on the upper surface of the base plate 201. Since the test specimen 203 needs to be placed horizontally, that is, the axial direction of the test specimen 203 is parallel. Based on the bottom plate 201, the support block 210 supports the test specimen 203 through the V-shaped groove on its upper surface to prevent it from rolling and ensure that the measurement plane 211 on the outer surface of the inner cylinder 207 is parallel to the horizontal plane. The bracket 202 is an L-shaped rod, one end of which is fixedly connected to the bottom plate 201 , and the other end is installed with a miniature clamp for clamping the adapter plate 206 . The non-contact displacement sensor 205 is fixed on the side of the adapter plate 206 , and the non-contact displacement sensor 205 is located directly above the test piece 203 . The non-contact displacement sensor 205 is a high-precision displacement sensor, which may be a non-contact displacement sensor such as a laser sensor, an infrared sensor, or an ultrasonic sensor. The measurement plane 211 of the outer surface of the inner cylinder is located within the measurement range of the non-contact displacement sensor. The counterweight 204 is used to radially load the adhesive layer 209. In this implementation, the counterweight 204 is cylindrical and coaxially placed in the inner hole of the inner cylinder 207 of the test piece 203, and the adhesive layer 209 is indirectly loaded through the inner cylinder 207. load. By testing the displacement of the measurement plane 211 , the creep displacement of the adhesive layer 109 in the cylindrical adhesive structure under radial force can be tested.

Example 3:

Based on the above-mentioned embodiment 1 and embodiment 2, this embodiment provides a method for testing the creep characteristics of precision bonded cylinders,

First prepare the test specimen:

Clean the bonding surfaces of the inner and outer cylinders used to form the test piece; apply glue evenly on the bonding surfaces of the inner and outer cylinders respectively, the amount of glue should be calculated in advance, slightly more than the required thickness of the adhesive layer; gently Insert the inner cylinder into the outer cylinder to complete the bonding; slightly rotate the two parts relative to each other to distribute the glue evenly, and scrape off the overflowing glue around the parts with a scraper; put the parts in a curing temperature environment for curing; After completion, a precision glued cylinder with a definite glue layer thickness and a uniform glue layer is obtained, that is, the test specimen.

The specific test steps are:

(1) According to the axial or radial creep displacement of the required test, the test specimen is placed in the test device of the above-mentioned embodiment 1 or embodiment 2, and then the test device is put into an incubator as a whole;

(2) Start the incubator, set the target temperature at 45 degrees Celsius, set the humidity at 10%, and start heating;

(3) When the temperature reaches 45 degrees Celsius, keep warm for 10 minutes;

(4) Turn on the non-contact displacement sensor and start the test;

(5) Continuously test for 3 hours, and collect and save the test data output by the non-contact displacement sensor in real time during the test.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. A creep characteristic testing device of a glued cylinder, the glued cylinder is used as a test piece, comprising: an outer cylinder, an inner cylinder that is sleeved inside the outer cylinder, and an inner circumference between the outer circumference of the outer cylinder and the outer circumference of the inner cylinder A glue layer for bonding two cylinders together; it is characterized in that the test device includes: a bottom plate, a bracket, a counterweight, a non-contact displacement sensor and an adapter plate; The test specimen is placed on the base plate, and the axial direction of the test specimen is perpendicular to the base plate; one end of the bracket is fixedly connected to the base plate, and an adapter plate is installed at the other end; the non-contact displacement sensor is installed on On the side of the adapter plate, the counterweight located on the top of the test piece is used to apply an axial load to the test piece, and the surface of the counterweight opposite to the non-contact displacement sensor is a plane, as A measuring surface; by testing the displacement of the measuring surface, the creep displacement of the glued cylinder under the axial force is tested. 2. A creep characteristic testing device of a glued cylinder, the glued cylinder is used as a test piece, including an outer cylinder, an inner cylinder set inside the outer cylinder, and between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder A glue layer for bonding two cylinders together; it is characterized in that the test device includes: a bottom plate, a bracket, a counterweight, a non-contact displacement sensor, an adapter plate and a support block; A plane is processed on the outer circumferential surface of the inner cylinder in the test specimen as the measuring surface; The test specimen is placed on the base plate through the support block, and the axial direction of the test specimen is guaranteed to be in a horizontal state through the support block, and the measurement surface is opposite to the non-contact displacement sensor; one end of the support It is fixedly connected with the bottom plate, and an adapter plate is installed at the other end; the non-contact displacement sensor is installed on the side of the adapter plate, and the counterweight is used to apply a radial load to the test specimen. The displacement of the measuring surface is used to test the creep displacement of the glued cylinder under radial force. 3. the creep characteristic testing device of cemented cylinder as claimed in claim 1, is characterized in that, described counterweight is cylindrical, acts on the axial end face of cylinder in test specimen, through described interior cylinder to The rubber layer is loaded indirectly; specifically: the axial end surface of the inner cylinder bottom is located inside the outer cylinder, and a snap ring is provided on the axial end surface of the inner cylinder bottom; the bottom end surface of the outer cylinder is in contact with the bottom plate, and the inner cylinder is provided with a snap ring There is a gap between the end face of the end and the bottom plate; the counterweight is fixed in the inner cylinder through a snap ring. 4. The creep characteristic testing device of glued cylinder as claimed in claim 3, is characterized in that, the top of described cylindrical counterweight is provided with more than one counterweight of square or other symmetrical shape, guarantees that described counterweight The surface opposite to the non-contact displacement sensor is a plane. 5. The creep characteristic test device of cemented cylinder as claimed in claim 2, is characterized in that, described counterweight is cylindrical, is coaxially placed in the inner hole of test specimen inner cylinder, passes through described inner cylinder Indirect loading of the bondline. 6. The creep characteristic testing device of the cemented cylinder as claimed in claim 1 or 2, wherein when it is necessary to measure the creep of the cemented cylinder at a set temperature, the whole of the testing device is placed Into the incubator and heated to the set temperature.