CN209446386U - Adjustable hardness test fixture - Google Patents

Abstract

The utility model discloses an adjustable hardness test fixture. A pedestal is arranged on the chassis, a left support frame and a right support frame are symmetrically installed on both sides of the pedestal, and a positioning plate is connected to the top of the left support frame and the right support frame. The cross-section of the seat is arc-shaped. There is a guide groove inside the fixture seat. A sliding sleeve is set on the outer periphery of the middle section of the fixture seat. A loading platform is arranged on the top of the sliding sleeve. A flat clamping block is connected, and an adjusting screw is installed on the column. The utility model can realize the pressing and fixing of any shape of the workpiece to be tested, the operation is stable, and the hardness test can be satisfied, which solves the phenomenon of bias pressure caused by the loose fixation of the irregular workpiece to be tested, which leads to the measurement The problem of large deviation between hardness and actual hardness. It can greatly improve the working efficiency of inspectors, ensure the accuracy and stability of microhardness testing, and has wide applicability.

Description

Adjustable hardness test fixture

technical field

The utility model relates to the technical field of microhardness testing equipment, in particular to an adjustable hardness testing jig.

Background technique

As a routine physical and chemical testing method, hardness testing is essential in the process of failure analysis and quality inspection. The hardness of a material is the ability of the material to resist local deformation, especially plastic deformation, indentation or scratches. It is an important performance index to measure the degree of softness and hardness of the material. . As one of the hardness tests, microhardness plays an irreplaceable role in surface coating, local deformation, abnormal structure, hardness gradient, thin-section samples, small-size samples, etc., and is often used for hardness testing of various micro-areas. . The surface flatness of the metal sample to be tested for hardness testing is relatively high. Only by ensuring that the indenter of the hardness tester is perpendicular to the surface of the sample can the test data be real and reliable. In the process of material research and related analysis, it often occurs that the surface of the tested sample is not parallel to the working surface. If the hardness is directly tested on the surface of the sample, the accuracy of the test value will be affected.

However, in actual measurement, some irregular parts are often encountered to be measured. Due to the irregular shape of the measured workpiece, it cannot be placed on the test bench stably. During the pressure measurement process, it is easy to be skewed, eccentric, or even partially spherical. Or spheroidal parts cannot be directly measured at all. The solution usually taken now is to measure by making a rectangular mosaic sample. Due to the troublesome production of the sample, and heat treatment is required after the production, the hardness error will be caused by the different processing parameters during the heat treatment process, and the measured hardness value will also be distorted. The surface to be tested is kept perpendicular to the axis of the indenter of the test device, so errors often occur in the experiment, which affects the quality of work, the operation process is cumbersome, the pre-tightening force is not enough, and time-consuming and labor-intensive.

Utility model content

Aiming at the problems raised in the above-mentioned background technology, the utility model provides an adjustable hardness test fixture, which can realize the compression and fixation of any shape of the workpiece to be tested, and meet the hardness test; solve the problem of hardness testing of irregular workpieces. Due to the bias phenomenon that is easy to occur due to loose fixation, the problem of large deviation between the measured hardness and the actual hardness is caused; it can greatly improve the work efficiency of the inspectors, ensure the accuracy and stability of the microhardness test, and has wide applicability.

In order to solve the above technical problems, the utility model provides the following technical solutions: the adjustable hardness test fixture includes a chassis and a fixture seat, a pedestal is arranged on the chassis, and a left support frame and a right support frame are symmetrically installed on both sides of the pedestal, The middle parts of the left support frame and the right support frame are correspondingly provided with through holes, and the clamp seat runs through the through holes; the tops of the left support frame and the right support frame are connected with a positioning plate, and a positioning hole is arranged in the middle of the positioning plate; The two ends of the fixture seat are cylindrical, the cross-section of the middle section is in the shape of a superior arc bow, and there is a guide groove in the superior arc bow shape, the upper part of the fixture seat is provided with a stage, and the middle section of the fixture seat is set with a sliding surface relative to the outer periphery of the stage. There is a left-handed screw in the guide groove on the lower left side of the stage, and a tooth surface clamp is connected to the left-handed screw; a right-handed screw is installed in the guide groove on the lower right side of the stage, and a plane clamp is connected to the right-handed screw , the left-handed screw and the right-handed screw pass through the through holes in the cylinder at both ends of the fixture seat respectively, and the inner ends are relatively connected through the coupling sleeve; The retaining ring, the outer ends of the left-handed screw and the right-handed screw are connected with rotating handles;

Clamping seats are arranged on both sides of the fixture seat, and the clamping seat on one side is equipped with a handle screw and a column is arranged above the clamping seat on this side, and a compression screw is installed on the clamping seat on the other side. Columns are arranged on both sides of the clamping seat, and adjusting screws are arranged on the columns.

Further, the tooth surface clamping block is T-shaped, with shaped teeth on one side of the upper part, and threaded holes on the lower part, which are connected with the left-handed screw.

Further, the plane clamping block is T-shaped, its upper part is a plane, and its lower part is provided with a threaded hole and connected with a right-handed screw.

Further, there are at least three columns, and the distance between them is evenly distributed.

Further, the through hole of the left support frame and the through hole of the right support frame have the same diameter and the same axis, and the through hole is in clearance fit with the cylinders at both ends of the clamp seat.

Compared with the prior art, the utility model has the advantages of large clamping force, simple operation and stable working state, and is suitable for hardness fixtures of various shapes and sizes, novel in structure and reasonable in design; It is tightly fixed to meet the hardness test requirements, and solves the phenomenon of bias caused by loose fixation when the irregular workpiece is tested for hardness, resulting in a large deviation between the measured hardness and the actual hardness. The test results are highly accurate and easy to operate. The height between the sample to be tested and the indenter can be quickly adjusted, so that the surface of the sample to be tested is kept perpendicular to the axis of the indenter, reducing experimental errors and greatly improving the work efficiency of inspectors. , to ensure the accuracy and stability of microhardness testing, and has wide applicability.

Description of drawings

Fig. 1 is the forward three-dimensional structure schematic diagram of the utility model;

Fig. 2 is a reverse three-dimensional structural schematic diagram of the utility model for dismantling the positioning plate 5;

Fig. 3 is a top view of the utility model where the positioning disc 5 is removed;

Fig. 4 is a vertical axial cross-sectional schematic view of the installation state of the fixture seat 2 in the utility model;

Fig. 5 is a schematic cross-sectional view of A-A in Fig. 4; Fig. 6 is a schematic structural view of the plane clamping block 20 in the present invention;

Fig. 7 is a structural schematic diagram of the tooth surface clamping block 11 in the utility model;

Fig. 8 is a three-dimensional structural schematic diagram of the tooth surface clamping block 11 in the utility model;

In the figure: 1-chassis, 2-fixture seat, 3-rotation handle, 4-left support frame, 5-positioning plate, 6-positioning hole, 7-right support frame, 8-column, 9-pedestal, 10-slide Set, 11-tooth surface clamp block, 12-adjusting screw, 13-clamping seat, 14-compression screw, 15-handle screw, 16-right-handed screw, 17-guiding groove, 18-stage, 19- Left-hand screw, 20-plane clamping block, 21-connecting shaft sleeve, 22-retaining ring.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further. Referring to Figures 1 to 8, the adjustable hardness test fixture includes a chassis 1 and a fixture seat 2, the chassis 1 is circular and a circular pedestal 9 is arranged on it, and the left support frame is symmetrically installed on both sides of the pedestal 9 4 and the right bracing frame 7, the middle part of the left bracing frame 4 and the right bracing frame 7 are all correspondingly provided with a circular through hole, and the fixture seat 2 runs through the through hole; the tops of the left bracing frame 4 and the right bracing frame 7 are connected by bolts Positioning disc 5, positioning hole 6 is arranged in the middle of positioning disc 5; both ends of fixture seat 2 are cylindrical, and the cross section of the middle section is in the shape of a superior arc bow, and a guide groove 17 is arranged in the superior arc bow shape. A stage 18 is provided, and a sliding sleeve 10 is set in the middle section of the fixture seat 2 relative to the periphery of the stage 18. A left-handed screw 19 is housed in the guide groove 17 on the left side of the bottom of the stage 18, and the left-handed screw 19 is connected to There is a tooth surface clamping block 11; a right-handed screw 16 is installed in the guide groove 17 below the right side of the stage 18, and a plane clamping block 20 is connected to the right-handed screw 16. The left-handed screw 19 and the right-handed screw 16 pass through the through holes in the cylinder at both ends of the fixture base 2 respectively, and the inner ends of the left-handed screw 19 and the right-handed screw 16 are relatively connected through the coupling sleeve 21; Retaining rings 22 are clamped at the joints with the left-handed screw rod 19 and the right-handed screw rod 16 respectively, and the outer ends of the left-handed screw rod 19 and the right-handed screw rod 16 are connected with rotating handles 3 . Clamping seat 13 is arranged on the two outer sides of fixture seat 2, wherein the clamping seat 13 on one side is equipped with handle screw rod 15 and the top of the clamping seat 13 on this side is provided with column 8, and the clamping seat 13 on the other side is equipped with Compression screw rod 14 and column 8 are arranged on both sides of the clamping seat 13 on this side, and adjusting screw rod 12 is all housed on the column 8. The tooth surface clamping block 11 is T-shaped, and one side of its upper part is provided with shaped teeth, and the lower part is provided with a threaded hole and is connected with a left-handed screw rod 19 . The plane clamping block 20 is T-shaped, its upper part is a plane, and its lower part is provided with a threaded hole and connected with the right-handed screw rod 16 . There are at least three columns 8, and the mutual spacing is evenly distributed. The through hole of the left support frame 4 has the same diameter and the same axis as the through hole of the right support frame 7 , and the through hole is in clearance fit with the cylinders at both ends of the clamp seat 2 .

Embodiment: The utility model provides the following preferred implementation cases: the adjustable hardness test fixture adopts a chassis 1 made of high-strength steel, and its bottom surface is equipped with a cylindrical structure with a diameter of about 8mm. The feet are connected to the hardness equipment platform. A pedestal 9 is arranged on the chassis 1. The pedestal 9 is a cylindrical structure with a diameter of 70 mm and a height of 26 mm. The left support frame 4 and the right support frame 7 are symmetrically installed on both sides of the pedestal 9. The left support frame 4 and the right support frame The heights of the frames 7 are both 60 mm, and are used to support the positioning plate 5 and the mounting fixture seat 2 (as shown in FIG. 1 ). The through holes of the left support frame 4 and the right support frame 7 have the same diameter and the same axis. The through hole is a circular hole, and the through hole is in clearance fit with the two ends of the clamp seat 2, and the clamp seat 2 runs through the left support frame 4 and the The through hole of the right support frame 7 (as shown in Figure 1, Figure 2 and Figure 3). The tops of the left support frame 4 and the right support frame 7 are fixedly connected with a positioning disc 5, the diameter of the positioning disc 5 is 80 mm, and a positioning hole 6 is arranged in the middle of the positioning disc 5, and the diameter of the positioning hole 6 is 50 mm, which is convenient for the hardness equipment to pass through the positioning Hole 6 is used for hardness testing of the sample to be tested. The two ends of the fixture seat 2 are cylindrical, and the cross section of the middle section is in the shape of a superior arc bow, and a guide groove 17 is arranged in the superior arc bow shape, and a stage 18 is arranged on the top of the fixture seat 2, and the middle section of the fixture seat 2 is opposite to the stage. The outer periphery of 18 is covered with a sliding sleeve 10 (as shown in Figure 5), and the center of the positioning hole 6 is on the same vertical line as the center of the stage 18, so that the surface to be tested of the sample to be tested is aligned with the indenter of the hardness equipment. The axes are kept vertical to reduce experimental errors. A left-handed screw 19 is housed in the guide groove 17 on the left side of the stage 18, and a tooth surface clamp block 11 is connected on the left-handed screw 19; a right-handed screw 16 is housed in the guide groove 17 on the right side of the stage 18, and 16 is connected with a plane clamping block 20, and the tooth surface clamping block 11 (as shown in Figure 7 and Figure 8) and the plane clamping block 20 (as shown in Figure 6) are all made of high-quality carbon structural steel. The left-handed screw 19 and the right-handed screw 16 pass through the through holes of the cylinders at both ends of the fixture base 2 respectively, and the inner ends are relatively connected through the coupling sleeve 21; Retaining rings 22 are respectively installed at each place, and the outer ends of the left-handed screw rod 19 and the right-handed screw rod 16 are connected with a rotating handle 3 (as shown in Figure 3 and Figure 4), which is convenient to be driven by rotating the rotating handle 3 with knurling on the outside. The tooth surface clamping block 11 and the plane clamping block 20 move left and right to facilitate the clamping and loosening of the test sample.

The two outer sides of the fixture seat 2 are respectively provided with clamping seats 13, wherein the clamping seat 13 on one side is equipped with a handle screw 15, and the top of the clamping seat 13 on this side is fixed with a column 8, which can be rotated by rotating the handle screw 15 It plays the role of fixing the position of the sliding sleeve 10 . Compression screw 14 is housed on the clamping seat 13 on the other side and column 8 is arranged on both sides of the clamping seat 13 of this side, and adjusting screw rod 12 is all housed on the column 8, by rotating three adjusting screw rods 12, the sample to be tested It is fixed to form a triangular stable structure to improve the stability and detection accuracy of the hardening operation. The tooth surface clamping block 11 is T-shaped, and its upper side is provided with shaped teeth, which are successively arranged in an equilateral triangle, rectangle, isosceles trapezoid and isosceles triangle structure, and their sizes are different, suitable for various sizes and shapes The hardness of the sample to be tested, the test result has high precision, the operation is simple, and the height between the sample to be tested and the indenter can be adjusted. The lower part of the tooth surface clamping block 11 is provided with a threaded hole and is connected with a left-handed screw 19 (as shown in Fig. 7 and Fig. 8 ). The plane clamping block 20 is T-shaped (as shown in FIG. 6 ), its upper part is a plane, and its lower part is provided with a threaded hole and connected with the right-handed screw rod 16 . There are at least three columns 8, and the mutual spacing is evenly distributed.

The utility model is suitable for clamping samples to be tested in various shapes and sizes. When in use, install the feet of the chassis 1 on the sample platform of the hardness equipment, and first rotate the three adjusting screw rods 12, handle screw rods 15 and The compression screw 14 clamps the sample to be tested on the middle position on the stage 18, and the horizontal plane of the stage 18 on the fixture seat 2 can be kept at an optimal inclination by the rotation of the fixture seat 2, so as to ensure that the sample to be tested The surface to be tested of the sample is kept perpendicular to the axis of the indenter to reduce experimental errors. The left-handed screw 19 and the right-handed screw 16 adopt left and right threads, which can make the stage 18 clamp tighter under the vibration state, and the hardness indenter can be pressed on the sample to be tested through the positioning hole 6 for accurate, reliable, all-round Advanced hardness testing operation, high accuracy of test results, greatly improving the work efficiency of inspectors, ensuring the accuracy and stability of microhardness testing, and having wide applicability.

Claims (5)

1. adjustable hardness test fixture, including chassis (1) and clamping fixture seat (2), which is characterized in that the chassis (1) is arranged above Have pedestal (9), the two sides on pedestal (9) are symmetrically installed with left support frame (4) and right support frame (7), left support frame (4) He Youzhi The middle part of support (7) is correspondingly arranged on through-hole, and the clamping fixture seat (2) is through through-hole；Left support frame (4) and right support frame (7) it is connected at the top of positioning disk (5), the centre of positioning disk (5) is provided with location hole (6)；The both ends of the clamping fixture seat (2) are Cylindrical shape, the section of interlude are in major arc arch, are equipped with guide groove (17) in major arc arch, the upper surface of clamping fixture seat (2) is provided with load Object platform (18), clamping fixture seat (2) middle section are set with sliding sleeve (10) with respect to the periphery of objective table (18), lower section on the left of objective table (18) Guide groove (17) is provided with left-handed screw (19), connects geared surface fixture block (11) on left-handed screw (19)；Under on the right side of objective table (18) The guide groove (17) of side is provided with right handed screw (16), and plane fixture block (20) are connected in right handed screw (16)；Left-handed screw (19) It is each passed through the through-hole in the cylinder of clamping fixture seat (2) both ends with right handed screw (16), and inner end is connected by the way that coupling sleeve (21) are opposite； It is installed with respectively retaining ring (22) on the inside of the both ends of clamping fixture seat (2) with left-handed screw (19) and right handed screw (16) junction, it is left-handed The outer end of screw rod (19) and right handed screw (16) is respectively connected with rotating handle (3)；

Clamping fixture seat (2) two sides are provided with clamping seats (13), and wherein the clamping seats (13) of side are equipped with handle screw (15) and should The top of the clamping seats (13) of side is equipped with column (8), equipped with clamping screw (14) and the side on the clamping seats (13) of the other side Clamping seats (13) both sides is provided with column (8), and adjusting screw rod (12) are respectively arranged on column (8).

2. adjustable hardness test fixture according to claim 1, which is characterized in that the flank of tooth fixture block (11) is T-shaped, Top is equipped with shape tooth on one side, and lower part is provided with threaded hole and connect with left-handed screw (19).

3. adjustable hardness test fixture according to claim 1, which is characterized in that the plane fixture block (20) is T-shaped, Top is plane, and lower part is provided with threaded hole and connect with right handed screw (16).

4. adjustable hardness test fixture according to claim 1, which is characterized in that the column (8) is at least three, and Mutual spacing is uniformly distributed.

5. adjustable hardness test fixture according to claim 1, which is characterized in that the through-hole of the left support frame (4) with The through-hole diameter of right support frame (7) is identical and same axis, the through-hole and clamping fixture seat (2) both ends cylinder clearance fit.