A metal longitudinal fine grinding and polishing test device

Abstract

The present application relates to a kind of metal longitudinal fine grinding polishing test device, to solve the problem that existing metal polishing test device cannot be carried out longitudinal grinding and polishing, and metal sample cannot have good surface quality.The technical scheme is a kind of metal longitudinal fine grinding polishing test device, including linear motor assembly that can be linearly moved and positioned on workbench and clamps and drives sample, characterized in that: the device further includes pulley abrasive belt assembly installed on workbench and gravity weight assembly that exerts force to abrasive belt in pulley abrasive belt assembly to make it contact with sample to realize polishing operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a metal testing device, in particular a metal longitudinal fine grinding and polishing testing device. BACKGROUND

[0002] The processing of metal materials includes grinding and polishing the surface of the metal materials to meet the requirements of Nadcap laboratory certification and sample preparation. Polishing refers to a processing method for reducing the surface roughness of a workpiece by mechanical, abrasive or electrochemical action to obtain a bright and smooth surface. Most metal round bar samples for material mechanics fatigue testing are manually polished with sandpaper before the experiment, but the manually polished metal surface is not smooth and uniform enough and cannot effectively eliminate surface hardening and residual stress, which may affect the accuracy of the later mechanical testing. In addition, laboratories often use handheld angular polishers for polishing. Because the sizes of metal round bar samples are inconsistent, the instrument also needs to be adjusted according to the size of the metal round bar sample, which brings a lot of inconvenience.

[0003] The traditional grinding and polishing device has the problems of inconvenient user tightening and fixing of different models of metal round bars, inconvenient user adjustment and transformation of the position of the device, and the current metal grinding and polishing device is horizontal grinding and polishing, which affects the accuracy of the test results of tensile and fatigue tests of the metal sample.

[0004] In view of the above problems, the original grinding and polishing device needs to be improved and designed. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the background art, and to provide a metal longitudinal fine grinding and polishing testing device to solve the problems of the existing metal polishing testing device that cannot perform longitudinal grinding and polishing and the metal sample that cannot have good surface quality.

[0006] To achieve the above purpose, the technical solution provided by the present application is:

[0007] A metal longitudinal fine grinding and polishing testing device, comprising a linear motor assembly that can be linearly moved and positioned on a workbench and clamps and drives a sample, characterized in that the device further comprises a pulley sand belt assembly installed on the workbench and a gravity weight assembly that applies force to the sand belt in the pulley sand belt assembly to make it contact with the sample to realize polishing work.

[0008] The linear motor assembly comprises a linear motor installed on the workbench, a servo motor driven by the linear motor, a tailstock with a machine tool top pin, and a clamp installed on the shaft of the servo motor to clamp the sample.

[0009] The pulley abrasive belt assembly comprises an unwinding abrasive belt disc rotatably positioned on the workbench by a standing support, a winding abrasive belt disc, a plurality of guide wheels, an abrasive belt sequentially winding around the guide wheels and winding around the unwinding abrasive belt disc and the winding abrasive belt disc respectively, and a torque motor driving the winding abrasive belt disc.

[0010] The gravity weight assembly comprises a floating pull rod hinged on the standing support and equipped with a plurality of guide wheels, a pull rope enabling the abrasive belt to adhere to the sample surface by pulling the floating pull rod, and gravity weights applying the pulling force to the pull rope.

[0011] The floating pull rod is swingably positioned on the standing support by the hinge point at the top, and at least three guide wheels are hingedly positioned on the floating pull rod for positioning the movement path of the abrasive belt, and the pull rope is connected to and pulls the lower part of the floating pull rod so that the abrasive belt can adhere to the sample surface to realize the polishing work.

[0012] The horizontal projections of the abrasive belt around the unwinding abrasive belt disc, the winding abrasive belt disc and the guide wheels all coincide.

[0013] The pulley abrasive belt assembly is further provided with a tensioning assembly for tensioning the abrasive belt to provide the required polishing pressure.

[0014] The tensioning assembly comprises a small slider slidably positioned on the standing support, a tensioning wheel fixed on the small slider and wound with the abrasive belt, and a tension spring applying force to the small slider.

[0015] The gravity weight assembly connects the floating pull rod through the pull rope wound around the pulley, thereby applying the horizontal polishing pressure to the abrasive belt during the polishing work, and the pulley is arranged on the workbench through a support.

[0016] The linear motor comprises a linear guide rail horizontally arranged on the workbench and a linear slider movably positioned on the primary component.

[0017] The clamp comprises a three-jaw chuck fixed on the shaft of the linear motor, and the three-jaw chuck is coaxial with the machine tool tail pin and is horizontally arranged, thereby cooperating with each other to support the sample to realize the 360° indexing rotary motion.

[0018] The machine tool tail pin is rotatably connected to one end of a screw rod, the screw rod cooperates with a screw hole on the tailstock, and the other end of the screw rod is equipped with an adjusting hand wheel to realize the axial feeding of the machine tool tail pin.

[0019] The beneficial effects of the present application are:

[0020] 1. The present application can carry out 90mm stroke range sample movement and sand belt movement synchronous linkage, each time of polishing and polishing uses the new area of sandpaper, the same sandpaper is used only once, ensure that the same sandpaper area is not reused; the sand belt disc is configured, different models of sand belt can be used.

[0021] 2. The strip mark after polishing of the present application is arranged along the longitudinal direction (axial direction) of the sample, the overall strip mark is uniformly distributed in the sample polishing section, and the stress is uniform; at the same time, the constant pressure is realized by using gravity, and the polishing force value applied on the sample surface is ensured to meet the requirements.

[0022] 3. The present application can adjust the polishing pressure according to different samples, so as to adapt to the polishing of samples of different soft and hard materials, and the polishing pressure is kept constant during the polishing process; thus excellent polishing quality can be obtained.

[0023] 4. The rotation speed of the servo motor in the present application can be adjusted, that is, the sandpaper and the sample can be kept synchronous rotation, and the cross grain is avoided.

[0024] 5. The torsion motor of the present application always keeps constant winding torsion, keeps the sand belt tension, and the torsion is adjustable. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced.

[0026] Figure 1 is one of the three-dimensional structure schematic diagram of the embodiment of the present application (right front side direction).

[0027] Figure 2 is the second three-dimensional structure schematic diagram of the embodiment of the present application (left front side direction).

[0028] Figure 3 is the third three-dimensional structure schematic diagram of the embodiment of the present application (hidden pulley sand belt assembly and gravity weight assembly).

[0029] Figure 4 is the three-dimensional structure schematic diagram of the pulley sand belt assembly in the embodiment of the present application.

[0030] Figure 5 is the three-dimensional structure schematic diagram of the gravity weight assembly in the embodiment of the present application.

[0031] In the figure: straight line slider 101, straight line guide rail 102, clamp 103, servo motor 104, tailstock 105, machine tool center pin 106; unwinding abrasive belt disc 107, guide wheel 108, winding abrasive belt disc 109, slack adjusting device 201 and torque motor 202; gravity weight 203, floating pull rod 204, pull rope 205, support 206, tension wheel 207, pull rope fixing screw 208, pull rod hinged shaft 209, tension spring 210, abrasive belt 300, sample 400. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, the embodiments described below by referring to the accompanying drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0033] The metal longitudinal precision grinding and polishing test device shown in the figure comprises a straight line motor assembly which is linearly movably positioned on a workbench and clamps and drives the sample 400; the straight line motor assembly comprises a straight line motor fixed on the workbench, a servo motor 104 driven by the straight line motor and a tailstock 105 with a machine tool center pin, and a clamp installed on the servo motor shaft to clamp the sample;

[0034] The straight line motor comprises a straight line guide rail 102 (primary component) horizontally arranged on the workbench and a straight line slider 101 (secondary component) movably positioned on the primary component; the servo motor 104 and the tailstock 105 are installed on the secondary component. The machine tool center pin is rotatably connected to one end of a screw rod through a bearing, the screw rod is cooperatively positioned in a screw hole of the tailstock, and the other end of the screw rod is connected with a hand wheel; the clamp is a three-jaw chuck.

[0035] The above is similar to the existing polishing test device.

[0036] The improvement of the present application is that the provided device further comprises a pulley abrasive belt assembly installed on the workbench and a gravity weight assembly which applies force to the abrasive belt in the pulley abrasive belt assembly to make it contact with the sample to realize the polishing work.

[0037] The pulley abrasive belt assembly comprises a pay-off abrasive belt disc 107, a take-up abrasive belt disc 109, a plurality of guide wheels 108, an abrasive belt 300 (preferably nylon rope) and a torque motor 202; the vertical support is vertically fixed on the workbench; the rotating shaft of the pay-off abrasive belt disc 107, the rotating shaft of the take-up abrasive belt disc 109 and the wheel shafts of the plurality of guide wheels are rotatably positioned on one side of the vertical support through bearings, the torque motor is installed on the other side of the vertical support, the torque motor shaft passes through the vertical support and then connects the rotating shaft of the take-up abrasive belt disc through a shaft coupling. The plurality of guide wheels are installed on the vertical support as needed to determine the movement path of the abrasive belt; the abrasive belt 300 passes through the plurality of guide wheels in sequence and is wound on the pay-off abrasive belt disc and the take-up abrasive belt disc at both ends; the rotating shaft of the pay-off abrasive belt disc is provided with damping to ensure that the abrasive belt is in a tensioned state when the torque motor is driven. The forward operation of the abrasive belt ensures that the polishing process is not reused, thereby ensuring the quality of the polishing surface.

[0038] Further, the axes of the pay-off abrasive belt disc 107, the take-up abrasive belt disc 109 and the plurality of guide wheels are parallel to each other; the horizontal plane projection of the abrasive belt wound on the pay-off abrasive belt disc 107, the take-up abrasive belt disc 109 and the plurality of guide wheels coincides and is perpendicular to the axis of the processed sample.

[0039] The gravity weight assembly comprises a floating pull rod, a pull rope and a gravity weight 203; the floating pull rod is swingably hinged on the vertical support through a pull rod hinge shaft 209 at the top of the floating pull rod (the shaft also serves as the rotating shaft of the guide wheel), and at least three guide wheels are hingedly positioned on the floating pull rod to position the movement path of the abrasive belt; one end of the pull rope is fixed to the lower part of the floating pull rod through a pull rope fixing screw 208, and the other end of the pull rope is fixed with the gravity weight 203. Figure 1 、 Figure 2 It can be seen that the support 206 is fixed on the workbench on the side of the linear motor, a pulley is installed on the top of the support, the other end of the pull rope extends from the floating pull rod, passes through the pulley and then connects the gravity weight, so that the pull rope on the side of the floating pull rod to the pulley remains in a substantially horizontal state under the action of the gravity weight; when the floating pull rod is pulled by the pull rope, the guide wheels on the floating pull rod swing towards the sample and drive the abrasive belt wound on the guide wheels to abut against the sample, thereby achieving the grinding and polishing of the sample. The gravity weight 203 can be replaced to achieve different polishing pressures.

[0040] Further, the pulley abrasive belt assembly is also provided with a tensioning assembly for tensioning the abrasive belt to provide the required polishing friction; the tensioning assembly comprises a small sliding block, a tensioning wheel 207 and a tension spring 210. Figure 4It is known that: the vertical sliding slot is arranged on the standing support, the small sliding block is embedded in the sliding slot in up-down sliding mode, the tensioning wheel is fixed on the small sliding block, one end of the tension spring is connected with the small sliding block and the other end is connected with the standing support so as to exert a pulling force on the small sliding block. During the working process, if the sand belt tension suddenly changes (such as the moment when the sand belt is attached to the sample or the moment when the sand belt is separated from the sample), the tensioning wheel can keep the sand belt tension from being affected by moving up and down.

[0041] The servo motor 104 can adjust the clamp 103 to rotate 360 degrees to realize the switching of the polishing surface, and make the clamp 103 and the tail seat 106 can adapt to metal samples of different lengths and diameters; so that the polishing work of the metal sample is longitudinal polishing, and after completing the polishing of the single-sided cylindrical surface, the metal sample is rotated to complete the subsequent single-sided cylindrical surface polishing.

[0042] The working principle of the present application is:

[0043] 1. Sample loading: one end of the sample is clamped by the clamp, and the other end is supported by the machine tool needle;

[0044] 2. Start the linear motor to drive the sample to move axially within the set length range;

[0045] 3. Load the gravity weight 203 to make the sand belt adhere to part of the cylindrical surface of the sample, so as to perform axial polishing work;

[0046] 4. After reaching the set time or the number of axial movements, start the servo motor to rotate the sample by a certain angle to polish the other part of the cylindrical surface of the sample; until the polishing work of the entire cylindrical surface of the set length is completed;

[0047] 5. When the length of the sample is greater than the set length, adjust the linear motor to continue the polishing work at the unpolished position until the polishing work of the entire sample surface is completed;

[0048] 5. During the operation, after reaching the set time, start the torque motor to rotate the sand belt by a certain length, so that the polishing part of the sand belt is not reused, thereby ensuring the polishing quality.

Claims

1. A metal longitudinal fine grinding and polishing test apparatus, comprising a linear motor assembly that is linearly movable and positioned on a worktable and clamps and drives a sample (400), characterized in that: The device also includes a pulley belt assembly mounted on a workbench and a gravity weight assembly that applies force to the belt (300) in the pulley belt assembly to make it contact the sample, thereby achieving the polishing operation. The linear motor assembly includes a linear motor mounted on a worktable, a servo motor (104) driven by the linear motor, a tailstock (105) with a machine tool ejector pin (106), and a fixture mounted on the servo motor shaft to hold the sample. The pulley abrasive belt assembly includes an unwinding abrasive belt reel (107) and a winding abrasive belt reel (109) that are rotatably positioned on the worktable by a support frame, a plurality of guide wheels (108), an abrasive belt that passes around the plurality of guide wheels in sequence and is wound around the unwinding abrasive belt reel and the winding abrasive belt reel at both ends, and a torque motor (202) that drives the winding abrasive belt reel. The gravity weight assembly includes a floating rod (204) hinged to the upright support and equipped with several guide wheels, a pull rope (205) that makes the sand belt stick to the sample surface by pulling the floating rod, and a gravity weight (203) that applies tension to the pull rope. The floating rod is pivotally positioned on the upright support via the top rod hinge shaft (209). At least three guide wheels are hinged on the floating rod to position the movement path of the sanding belt. The pull rope connects to and pulls the lower part of the floating rod so that the sanding belt can adhere to the sample surface to achieve the grinding and polishing operation. The horizontal projections of the abrasive belts on the unwinding reel, the winding reel, and the guide wheel all coincide and are perpendicular to the axis of the sample. The pulley belt assembly is also equipped with a tensioning assembly for tensioning the belt to provide the required polishing pressure; the tensioning assembly includes a small slider slidably positioned on the support, a tensioning wheel (207) fixed to the small slider and wound around the belt, and a tension spring (210) applying force to the small slider.

2. The metal longitudinal fine grinding and polishing test apparatus according to claim 1, characterized in that: The gravity weight assembly is connected to the floating rod via a rope wound around the pulley, thereby applying horizontal grinding pressure to the sand belt in the grinding and polishing operation; the pulley is mounted on the worktable via a support (206).

3. The metal longitudinal fine grinding and polishing test apparatus according to claim 2, characterized in that: The linear motor includes a linear guide (102) arranged horizontally on the worktable and a linear slider (101) movably positioned on the primary component.

4. The metal longitudinal fine grinding and polishing test apparatus according to claim 3, characterized in that: The fixture includes a three-jaw chuck fixed on the linear motor shaft. The three-jaw chuck is coaxial with the machine tool ejector pin and arranged horizontally, so as to cooperate with each other to support the sample to achieve 360° indexing rotation.

5. The metal longitudinal fine grinding and polishing test apparatus according to claim 4, characterized in that: The machine tool ejector pin is rotatably connected to one end of a screw, the screw engages with a screw hole on the tailstock, and the other end of the screw is equipped with an adjustment handwheel to achieve axial feed of the machine tool ejector pin.

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