A dumbbell specimen preparation machine

Abstract

The utility model is suitable for sample processing technical field provides a kind of sample preparation machine of dumbbell-shaped sample, and mould plate and clamping groove can be disassembled assembly, and pressing plate is pressed to sample blank in mould plate to fix reference point;Cylinder milling cutter and guide wheel coaxial linkage, feeding push mechanism continues to act on moving plate, so that mould plate is always pasted to guide wheel;Driving mechanism drives the plate with sample longitudinal movement, and the lateral dynamic adjustment of moving plate with mould plate profile is combined, so that cylinder milling cutter accurately imitates mould plate profile to complete milling.This sample preparation machine of dumbbell-shaped sample does not need complex programming, and different samples can be processed by changing mould plate, and it is strong in versatility;Dynamic positioning of feeding mechanism ensures that mould plate is pasted to guide wheel, and milling accuracy is high;Clamping structure simplifies sample fixing and turning operation, reduces secondary clamping error, improves sample preparation efficiency and consistency, and meets the demand of material tensile test standard sample preparation.

Description

Technical Field

[0001] This utility model belongs to the field of sample processing technology, and in particular relates to a sample preparation machine for dumbbell-shaped samples. Background Technology

[0002] In the fields of materials research and development, industrial production, and quality inspection, tensile tests are necessary to assess key mechanical properties such as tensile strength and elongation of materials like metals and plastics. However, the accuracy of these test results is highly dependent on the processing quality of the standard specimens. Figure 1 The dumbbell-shaped tensile specimen shown has a structure with thicker clamping sections at both ends and a uniform test section in the middle. This structure can avoid material damage during clamping and ensure that the force is concentrated in the test section. It has become a standard specimen shape widely used in the industry.

[0003] However, current equipment for processing dumbbell-shaped specimens still has many shortcomings. Some traditional sample preparation methods rely on manual grinding or processing with general-purpose machine tools. Manual operation is prone to low dimensional accuracy and poor shape consistency of specimens due to differences in technique. General-purpose machine tools require professional personnel to write complex processing programs, and the adjustment process for different specifications of specimens is cumbersome, making it difficult to meet the requirements of efficient and standardized sample preparation.

[0004] Meanwhile, existing dedicated sample preparation machines have defects in their core functional design. Most of the equipment lacks a stable guiding and dynamic feeding mechanism, which makes the sample prone to positioning deviation during processing. This results in discontinuous sample curves and dimensional deviations exceeding the allowable range after milling. Some equipment has an unreasonable clamping structure design, requiring multiple disassembly and adjustment during sample installation and flipping. This not only increases the number of operation steps but also easily causes errors due to secondary clamping, further affecting the reliability of subsequent tensile test data and making it unsuitable for the use requirements of high-precision testing scenarios. Utility Model Content

[0005] This invention provides a dumbbell-shaped sample preparation machine, which aims to solve the problems of requiring professional personnel to write complex processing programs for processing dumbbell-shaped samples on general-purpose machine tools, and the existing special sample preparation equipment having insufficient processing accuracy, cumbersome sample clamping and flipping operations that are prone to errors.

[0006] This invention is implemented as follows: a dumbbell-shaped sample preparation machine includes a base plate, a cylindrical milling cutter is vertically arranged on the upper left of the base plate, a moving plate is provided on the base plate by a feed pushing mechanism that can slide laterally to the left of the cylindrical milling cutter and slide to the right under the pressure of the cylindrical milling cutter, a slide plate that moves longitudinally is provided on the moving plate by a drive mechanism, a clamping groove with an open left side is fixedly installed on the left side of the slide plate, a template extending outward to the outside of the clamping groove is provided at the bottom of the inner cavity of the clamping groove, and a pressure plate that presses the sample blank onto the template is provided at the top of the inner cavity of the clamping groove.

[0007] The bottom end of the cylindrical milling cutter is provided with a guide wheel of the same outer diameter. The outer side of the template is formed with the same shape as one side of the sample. When the slide moves longitudinally, the template abuts against the guide wheel and pushes the moving plate to move so that the cylindrical milling cutter mills along the outer curve of the template on the side of the sample blank.

[0008] Preferably, the feed pushing mechanism includes an adjustment component and multiple pushing components. The pushing component includes a first fixed seat and a second fixed seat. The first fixed seat is fixedly mounted on the base plate, and the second fixed seat is fixedly connected to the bottom of the movable plate and located to the left of the first fixed seat. An adjustment shaft with its front end movably passing through the second fixed seat is threaded onto the first fixed seat. A spring is provided on the adjustment shaft between the first fixed seat and the second fixed seat to push the second fixed seat to move to the left.

[0009] Preferably, the adjustment assembly includes a third fixed seat and a fourth fixed seat. The third fixed seat is fixedly installed on the base plate, and the fourth fixed seat is fixedly installed on the bottom of the movable plate and located to the left of the third fixed seat. A feed shaft with its right end movably extending to the right side of the third fixed seat is threadedly connected to the fourth fixed seat. The right end of the feed shaft is provided with a screw head and a retaining ring that can abut against the third fixed seat.

[0010] Preferably, a milling shaft is rotatably and vertically disposed on the substrate via a bearing seat, the guide wheel and the cylindrical milling cutter are both disposed on the milling shaft, and a drive motor is disposed at the bottom of the substrate, the drive motor driving the milling shaft to rotate through a transmission mechanism.

[0011] Preferably, an adjusting screw for adjusting the height of the pressure plate is provided through the top of the clamping groove, and a handwheel is provided at the top of the adjusting screw.

[0012] Preferably, the bottom of the groove cavity is provided with limiting blocks at both ends for positioning the sample blank.

[0013] Preferably, the top of the substrate is provided with a transverse linear guide rail for the movement of the movable plate, and the top of the movable plate is provided with a longitudinal linear guide rail for the movement of the slide plate.

[0014] Beneficial effects

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The dumbbell-shaped sample preparation machine of this utility model integrates a template guide and a dynamic feed adjustment mechanism, which effectively improves the sample preparation accuracy and efficiency. It can adapt to the processing of different specifications of samples by changing the template without complex programming, and the convenience of sample changeover is significantly improved. The spring-driven feed pushing mechanism can respond to the shape changes of the template in real time, ensuring the stability of the relative position of the sample and the milling cutter during the milling process, avoiding dimensional deviations caused by positioning offset, and producing samples with high consistency in shape, meeting the requirements of standardized testing. The optimized clamping groove and pressure plate structure simplifies the sample clamping and flipping process, reduces secondary clamping errors, and has a high degree of overall structural integration, small space occupation, and convenient operation and maintenance. It reduces the intensity of manual operation and ensures the reliability of the sample, making it suitable for high-precision and high-efficiency sample preparation scenarios such as laboratories. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the sample structure;

[0017] Figure 2 This is a schematic diagram of the structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the bottom structure of the substrate in this utility model;

[0019] Figure 4 This is a schematic diagram of the base plate and the feed mechanism in this utility model;

[0020] Figure 5 This is a schematic diagram of the moving plate and the feeding mechanism in this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the top of the movable plate in this utility model;

[0022] Figure 7 This is a structural schematic diagram of the groove position in this utility model;

[0023] Figure 8 This is a schematic diagram of the structure of the template and the pressure plate in this utility model;

[0024] Figure 9 This is a schematic diagram of the template structure in this utility model.

[0025] In the figure: 1-Base plate, 2-Moving plate, 3-Slide plate, 4-Drive mechanism, 5-Clamping groove, 6-Mount template, 7-Sample blank, 8-Pressure plate, 9-Cylindrical milling cutter, 10-Drive motor, 11-Adjusting screw, 12-Milling shaft, 13-Bearing seat, 14-Guide wheel, 15-Handwheel, 16-Limiting block, 17-Transverse linear guide rail, 18-Vertical linear guide rail, 19-First fixed seat, 20-Adjusting shaft, 21-Second fixed seat, 22-Spring, 23-Limiting ring, 24-Third fixed seat, 25-Feed shaft, 26-Fourth fixed seat. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] Please see Figure 2-9 This utility model provides a technical solution: a dumbbell-shaped sample preparation machine, including a base plate 1, a cylindrical milling cutter 9 is vertically arranged on the left side above the base plate 1, a moving plate 2 is provided on the base plate 1 through a feed pushing mechanism, which can slide to the left side of the cylindrical milling cutter 9 and slide to the right under the pressure of the cylindrical milling cutter 9, a sliding plate 3 that moves longitudinally is provided on the moving plate 2 through a drive mechanism 4, a clamping groove 5 with an open left side is fixedly installed on the left side of the sliding plate 3, a template 6 extending outward to the outside of the clamping groove 5 is provided at the bottom of the inner cavity of the clamping groove 5, and a pressure plate 8 that presses the sample blank 7 onto the template 6 is provided at the top of the inner cavity of the clamping groove 5 in a lifting manner.

[0028] The bottom end of the cylindrical milling cutter 9 is provided with a guide wheel 14 of the same outer diameter, and the two are coaxially mounted on the milling axis to ensure the matching accuracy of the milling depth with the contour of the template 6. The outer side of the template 6 forms the same shape as one side of the sample. When the slide plate 3 moves longitudinally, the template 6 abuts against the guide wheel 14 and pushes the moving plate 2 to move so that the cylindrical milling cutter 9 mills along the outer curve of the template 6 on the side of the sample blank 7.

[0029] Please refer to Figure 1 The diagram shows the structure of a dumbbell-shaped sample, with approximately concave curves formed on both sides.

[0030] In this embodiment, the cylindrical milling cutter 9 has multiple cutting edges spaced apart around its circumference. When the cylindrical milling cutter 9 rotates, it comes into contact with the material and can mill the material to form the required shape.

[0031] The side profile of template 6 matches the target curve on one side of the sample, and its height is adapted to guide wheel 14; when the sample blank 7 is pressed into place by pressure plate 8, its overall thickness is within the cutting edge processing range of cylindrical milling cutter 9, ensuring that cylindrical milling cutter 9 can form a continuous and complete cutting path on the side of sample blank 7.

[0032] The feed mechanism maintains a leftward pushing force on the moving plate 2, causing the template 6 and the sample blank 7 to continuously tend to move to the left. When the template 6 contacts the guide wheel 14, the leftward movement of the moving plate 2 and the sample blank 7 is restricted, at which point the maximum milling depth at that position is reached. Since the guide wheel 14 has the same outer diameter as the cylindrical milling cutter 9, the milling depth of the sample blank 7 at this position is exactly equal to the distance between its edge and the corresponding edge of the template 6, thus milling out a shape consistent with the template 6.

[0033] The drive mechanism 4 is driven by a lead screw and consists of a motor, a lead screw, and a lead screw sleeve. The motor is fixed to one end of the top of the moving plate 2. The lead screw is rotatably connected to the top of the moving plate 2 through a mounting base and is linked to the motor shaft. The lead screw sleeve is threadedly engaged with the lead screw and is fixedly connected to the top of the slide plate 3. When the drive mechanism 4 is working, it drives the slide plate 3 to move back and forth longitudinally, so that the clamping groove 5 and the sample blank 7 are advanced synchronously, and its side is milled by the cylindrical milling cutter 9 in sequence.

[0034] During the longitudinal advancement process, the side of the template 6 remains in contact with the guide wheel 14. Because the side of the template 6 has a concave-convex curve, its contact position with the guide wheel 14 changes in real time as the advancement progresses: when the protruding part contacts the guide wheel 14, the template 6 is pressed to the right, causing the clamping groove 5, the sliding plate 3, and the moving plate 2 to move to the right simultaneously; when the concave part contacts the guide wheel 14, the moving plate 2 is fed to the left under the action of the feed mechanism. Through this dynamic adjustment, the template 6 remains tightly attached to the guide wheel 14, ensuring that the cylindrical milling cutter 9 mills a contour on the side of the sample blank 7 that is completely consistent with the template 6.

[0035] After milling one side is completed, move the moving plate 2 to the right to move the sample blank 7 away from the cylindrical milling cutter 9. After removing the sample blank 7 and flipping it over, clamp the other side towards the cylindrical milling cutter 9 and clamp it against the template 6. Repeat the above transverse feed and longitudinal advance process to complete the milling of the other side of the sample blank.

[0036] The template 6 is installed in the clamping groove 5 by means of a detachable structure such as pins. By replacing the template 6 with different contours, various shapes of samples can be processed. When replacing the template 6, it is necessary to ensure that it is aligned with the positioning reference of the clamping groove to avoid affecting the accuracy of the sample contour due to installation offset.

[0037] Please refer to Figure 4 and 5Furthermore, the feed pushing mechanism includes an adjustment component and multiple pushing components. The pushing components include a first fixed seat 19 and a second fixed seat 21. The first fixed seat 19 is fixedly mounted on the base plate 1, and the second fixed seat 21 is fixedly connected to the bottom of the movable plate 2 and located to the left of the first fixed seat 19. An adjustment shaft 20 with its front end movably passing through the second fixed seat 21 is threaded onto the first fixed seat 19. A spring 22 is provided on the adjustment shaft 20 between the first fixed seat 19 and the second fixed seat 21 to push the second fixed seat 21 to move to the left.

[0038] In this embodiment, the spring 22 is a compression spring, which is always in a compressed state and generates elastic force to push the second fixed seat 21 and the movable plate 2, causing them to tend to move to the left.

[0039] The second fixed seat 21 is movably connected to the adjusting shaft 21 and can move along the axial direction of the adjusting shaft 21 under pressure. At the same time, the adjusting shaft 21 can rotate within the second fixed seat 21.

[0040] A limiting ring 23 is fixedly connected to the middle of the adjusting shaft 20. The right end of the adjusting shaft 20 has an external thread, and the inner wall of the first fixing seat 19 has an internal thread. The adjusting shaft 20 is threadedly connected to the first fixing seat 19. A screw head is provided at the right end of the adjusting shaft 20, allowing for easy adjustment of its left and right position using tools such as a wrench. This, in turn, adjusts the left and right position of the limiting ring 23, thereby changing the elastic force of the adjusting spring 22. The left end of the adjusting shaft 20 passes through the second fixing seat 21 and extends a certain distance to the left.

[0041] Under the elastic force of spring 22, the moving plate 2 always tends to move to the left. When the guide wheel 14 presses against the protruding position on the side of the template 6, the moving plate 2 moves to the right and the elastic force of spring 22 increases. When the guide wheel 14 presses against the recessed position on the edge of the template 6, the moving plate 2 moves to the left for feeding under the elastic force of spring 22. Thus, the feeding depth of the sample blank 7 is adjusted dynamically in real time according to the shape of the side of the template 6, so as to mill the same shape as the side of the template 6 along the surface of the sample blank 7.

[0042] Please refer to Figure 4-5 Furthermore, the adjustment assembly includes a third fixed seat 24 and a fourth fixed seat 26. The third fixed seat 24 is fixedly mounted on the base plate 1, and the fourth fixed seat 26 is fixedly mounted on the bottom of the movable plate 2 and located to the left of the third fixed seat 24. A feed shaft 25 with its right end movably extending to the right side of the third fixed seat 24 is threadedly connected to the fourth fixed seat 26. The right end of the feed shaft 25 is provided with a screw head and a retaining ring that can abut against the third fixed seat 24.

[0043] In this embodiment, when the feed shaft 25 is tightened by turning the screw head in the forward direction, the feed shaft 25 moves to the left relative to the fourth fixed seat 26, which shortens the length of the feed shaft 25 on the right side of the fourth fixed seat 26. Since the retaining ring will press against the third fixed seat 24, it is equivalent to pulling the fourth fixed seat 26 and the moving plate 2 to the right. At this time, the second fixed seat 21 moves to the right in sync, further compressing the spring 22. At this time, the clamping groove 5 is away from the cylindrical end mill 9, and a large gap is formed between the two, which can clamp or remove the workpiece.

[0044] When the feed shaft 25 is turned in the opposite direction again, that is, when the feed shaft 25 is loosened, the feed shaft 25 moves to the right relative to the fourth fixed seat 26, making the length of the feed shaft 25 on the right side of the fourth fixed seat 26 longer. At this time, the moving plate 2 moves to the left under the action of the spring force of the spring 22 to perform lateral feed.

[0045] When the feed shaft 25 is loosened sufficiently, all positions of the template 6 are in contact with the guide wheel 14. At this time, the retaining ring at the right end of the feed shaft 25 will still not contact the third fixed seat 24. At this time, the feed shaft 25 has lost its restrictive effect on the fourth fixed seat 26. At this time, longitudinal feed can be performed. During the milling process, as the longitudinal feed proceeds, the contact position between the template 6 and the guide wheel 14 changes dynamically. The extension and retraction of the spring 22 controls the transverse feed of the sample blank 7. The same shape as the side of the template 6 is milled on the side of the sample blank 7.

[0046] Furthermore, a milling shaft 12 is rotatably and vertically disposed on the substrate 1 via a bearing seat 13. A guide wheel 14 and a cylindrical milling cutter 9 are both disposed on the milling shaft 12. A drive motor 10 is disposed at the bottom of the substrate 1, and the drive motor 10 drives the milling shaft 12 to rotate through a transmission mechanism.

[0047] In this embodiment, the transmission mechanism can be a synchronous belt mechanism, with synchronous pulleys installed at the bottom ends of the output shaft of the drive motor 10 and the milling shaft 12, respectively, and the two synchronous pulleys achieving transmission through a synchronous belt.

[0048] The cylindrical end mill 9 is mounted on the milling shaft 12 via a keyway and rotates synchronously with the milling shaft 12. A locking screw is provided on the top of the milling shaft 12 to lock the cylindrical end mill.

[0049] The guide wheel 14 is mounted on the milling shaft 12 and can rotate independently of the milling shaft 12. Its main purpose is to guide and position the template 6. At the same time, the wheel-shaped structure can reduce the friction between the guide wheel and the template 6.

[0050] Furthermore, an adjusting screw 11 for adjusting the height of the pressure plate 8 is provided through the top of the clamping groove 5, and a handwheel 15 is provided at the top of the adjusting screw 11.

[0051] A mounting base is provided on one side of the slide plate 3. The adjusting screw 11 is threaded through the mounting base and its bottom end extends into the clamping groove 5. It is rotatably connected to the top of the pressure plate 8, and the pressure plate 8 is slidably connected to the inner wall of the clamping groove 5. By rotating the handwheel 15, the adjusting screw 11 is rotated, thereby changing the height of the adjusting screw 11 and thus changing the height of the pressure plate 8.

[0052] The adjusting screw 11 and the upper wall of the clamping groove 5 can also be threaded. The two sets of threaded connections ensure the self-locking effect of the adjusting screw 11 and prevent it from deflecting due to vibration during processing, thus affecting the clamping effect of the pressure plate 8.

[0053] The bottom of the inner cavity of the clamping groove 5 is provided with limiting blocks 16 at both ends for positioning the sample blank. The position of the limiting blocks 16 can be adjusted by sliding bolts to change the interval between the two limiting blocks 16 to accommodate templates 6 of different lengths. The two ends of the template 6 are in contact with the limiting blocks 16 respectively. The limiting blocks 16 are used to position the end of the sample blank 7 so that its end is pressed against the limiting blocks 16, thereby making its end flush with the template 6.

[0054] The top of the substrate 1 is provided with a transverse linear guide rail 17 for the movable plate 2 to move, and the top of the movable plate 2 is provided with a longitudinal linear guide rail 18 for the slide plate 3 to move.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sample preparation machine for dumbbell-shaped specimens, characterized in that: The system includes a substrate (1), a cylindrical milling cutter (9) is vertically arranged on the left side above the substrate (1), a moving plate (2) is provided on the substrate (1) by a feed pushing mechanism, which can slide to the left side of the cylindrical milling cutter (9) and slide to the right under the pressure of the cylindrical milling cutter (9), a sliding plate (3) that moves longitudinally is provided on the moving plate (2) by a drive mechanism (4), a left-side open clamping groove (5) is fixedly installed on the left side of the sliding plate (3), a template (6) extending outward to the outside of the clamping groove (5) is provided at the bottom of the inner cavity of the clamping groove (5), and a pressure plate (8) that presses the sample blank (7) onto the template (6) is provided at the top of the inner cavity of the clamping groove (5) in a lifting manner; The bottom end of the cylindrical milling cutter (9) is provided with a guide wheel (14) of the same outer diameter. The outer side of the template (6) forms the same shape as one side of the sample. When the slide plate (3) moves longitudinally, the template (6) abuts against the guide wheel (14) and pushes the moving plate (2) to move so that the cylindrical milling cutter (9) mills along the outer curve of the template (6) on the side of the sample blank (7).

2. The sample preparation machine for a dumbbell-shaped specimen as described in claim 1, characterized in that: The feed pushing mechanism includes an adjustment component and multiple pushing components. The pushing components include a first fixed seat (19) and a second fixed seat (21). The first fixed seat (19) is fixedly mounted on the base plate (1). The second fixed seat (21) is fixedly connected to the bottom of the moving plate (2) and located to the left of the first fixed seat (19). An adjustment shaft (20) with its front end movably passing through the second fixed seat (21) is threaded onto the first fixed seat (19). A spring (22) is provided on the adjustment shaft (20) between the first fixed seat (19) and the second fixed seat (21) to push the second fixed seat (21) to move to the left.

3. The sample preparation machine for a dumbbell-shaped specimen as described in claim 2, characterized in that: The adjustment assembly includes a third fixed seat (24) and a fourth fixed seat (26). The third fixed seat (24) is fixedly installed on the base plate (1), and the fourth fixed seat (26) is fixedly installed at the bottom of the movable plate (2) and located to the left of the third fixed seat (24). A feed shaft (25) with its right end movably extending to the right side of the third fixed seat (24) is threaded onto the fourth fixed seat (26). The right end of the feed shaft (25) is provided with a screw head and a retaining ring that can abut against the third fixed seat (24).

4. The sample preparation machine for a dumbbell-shaped specimen as described in claim 1, characterized in that: A milling shaft (12) is rotatably and vertically disposed on the substrate (1) via a bearing seat (13). The guide wheel (14) and the cylindrical milling cutter (9) are both disposed on the milling shaft (12). A drive motor (10) is disposed at the bottom of the substrate (1). The drive motor (10) drives the milling shaft (12) to rotate through a transmission mechanism.

5. The sample preparation machine for a dumbbell-shaped specimen as described in claim 1, characterized in that: An adjusting screw (11) for adjusting the height of the pressure plate (8) is provided through the top of the clamping groove (5), and a handwheel (15) is provided at the top of the adjusting screw (11).

6. The sample preparation machine for a dumbbell-shaped specimen as described in claim 1, characterized in that: The bottom of the inner cavity of the clamping groove (5) is provided with limiting blocks (16) for positioning the sample blank.

7. The sample preparation machine for a dumbbell-shaped specimen as described in claim 1, characterized in that: The top of the substrate (1) is provided with a transverse linear guide rail (17) for the movement of the movable plate (2), and the top of the movable plate (2) is provided with a longitudinal linear guide rail (18) for the movement of the slide plate (3).

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