A multifunctional sample block grinding mechanism and a sample block arc surface grinding method

Abstract

The present invention relates to a multifunctional sample block grinding mechanism and a sample block arc surface grinding method. The multifunctional sample block grinding mechanism includes a grinding head assembly and a feed assembly, and also includes a grinding support and a positioning fixture; the grinding support is arranged on the feed assembly and is located on the side where the grinding wheel in the grinding head assembly is located; the grinding support includes a base plate and a support, the base plate and the support are connected by a swivel pin and a screw, and the swivel pin is located at the center position in the width direction of the support; the positioning fixture positions and clamps the sample block, and the positioning fixture is detachably mounted on the support of the grinding support. The present invention realizes that flat surface grinding and arc surface grinding can be completed on the same device, and the positioning and clamping are convenient and accurate, which improves the work efficiency and sample block grinding quality and reduces the equipment cost.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing equipment, and in particular to a multifunctional sample block grinding mechanism and a sample block arc surface grinding method. Background Art

[0002] In the braking system of a car, brake pads are the most critical safety parts. The quality of all braking effects is determined by brake pads. Therefore, good brake pads are the protectors of people and cars. In order to ensure the quality of brake pads, necessary inspection tests must be carried out during the production of brake pads, such as small sample bench tests, friction performance drag tests, friction tests and shear strength tests.

[0003] When doing the inspection test, it is necessary to take a small sample from the brake pad for testing. First, the sample must be cut into the required size, and then the cut sample must be ground to meet the dimensional accuracy requirements of the inspection sample. The shapes of the sample that need to be ground include flat surfaces and curved surfaces, and most of the equipment on the market can only grind flat surfaces or curved surfaces. In this way, to complete the sampling factory needs to prepare two grinding equipment, which increases the equipment cost and reduces work efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a multifunctional sample block grinding mechanism and a sample block arc surface grinding method, which can realize flat surface grinding and arc surface grinding on the same device, and the positioning and clamping are convenient and accurate, thereby improving work efficiency and sample block grinding quality and reducing equipment costs.

[0005] In order to achieve the above-mentioned purpose, on the one hand, the technical solution adopted by the present invention is: a multifunctional sample block grinding mechanism, including a grinding head assembly, a feed assembly, a grinding support and a positioning fixture; the grinding support is arranged on the feed assembly and is located on the side where the grinding wheel in the grinding head assembly is located; the grinding support includes a base plate and a support, the base plate and the support are connected by a swivel pin and a screw, and the swivel pin is located at the center position in the width direction of the support; the positioning fixture positions and clamps the sample block, and the positioning fixture is detachably mounted on the support of the grinding support.

[0006] In this technical solution, the base plate and the support are connected by a swivel pin and a screw. When grinding the plane of the sample block, tighten the screw to lock the base plate and the support. At this time, the surface to be processed of the grinding sample block is parallel to the grinding wheel surface, and plane grinding can be performed; when grinding the arc surface of the sample block, unscrew or loosen the screw and only leave the swivel pin. At this time, the support can realize circular motion around the swivel pin with the positioning fixture, and the sample block can be rotated and fed at the same time to realize arc surface grinding.

[0007] By adopting this technical solution, both flat surface and curved surface can be ground on one grinding mechanism; the two functions improve work efficiency and sample grinding quality and reduce equipment costs.

[0008] Preferably, the support includes a horizontal plate and a vertical plate, which are vertically fixedly connected, the horizontal plate is connected to the bottom plate, and the vertical plate is connected to the positioning fixture, and reinforcing ribs are provided on the vertical surfaces of the horizontal plate and the vertical plate away from the positioning fixture.

[0009] By adopting this technical solution, the setting of the horizontal plate and the vertical plate realizes the fixation of the positioning fixture and the connection with the base plate, which not only realizes the grinding of the arc surface, but also ensures the vertical accuracy and flatness of the surface grinding.

[0010] Preferably, the positioning fixture includes a bracket, a lifting screw and a lifting and pressure plate; the bracket is detachably connected to the vertical plate of the support, and the bracket is a vertically arranged rectangular frame structure; the lifting screw longitudinally passes through the upper horizontal frame and the lower horizontal frame of the bracket, and is connected to the bearings of the upper horizontal frame and the lower horizontal frame, and a knob is provided at the upper end of the lifting screw; the lifting and pressure plate is threadedly matched with the lifting screw, and the lifting and pressure plate is slidably connected to the two vertical frames of the bracket, and the two vertical frames of the bracket are respectively provided with sliding grooves that cooperate with the two ends of the lifting and pressure plate.

[0011] By adopting this technical solution, the lifting and lowering pressure plate is threadedly connected to the lifting screw rod, so that the lifting and lowering pressure plate can cooperate with the upper horizontal frame to position and clamp the workpiece upward, and the lifting and lowering pressure plate can cooperate with the lower horizontal frame to position and clamp the workpiece downward. One structural part has two positioning and clamping structures, which is ingeniously designed and low-cost. In addition, the design of the slide groove ensures the straightness of the lifting and lowering pressure plate, thereby ensuring the positioning accuracy of the workpiece.

[0012] Preferably, a positioning groove 1 is provided at the lower end of the side facade of the upper horizontal frame of the bracket away from the vertical plate, a positioning groove 2 is provided at the upper end of the side facade of the lower horizontal frame of the bracket away from the vertical plate, a positioning groove 3 is provided at the upper end of the side facade of the lifting and pressing plate away from the vertical plate, and a positioning groove 4 is provided at the lower end of the side facade of the lifting and pressing plate away from the vertical plate. The groove depth of positioning groove 1 is the same as that of positioning groove 3, and the groove depth of positioning groove 2 is the same as that of positioning groove 4.

[0013] The positioning accuracy of the positioning fixture to the workpiece is ensured by setting the positioning groove one, the positioning groove two, the positioning groove three and the positioning groove four, thereby improving the grinding quality.

[0014] Preferably, the grinding mechanism further comprises a clamping body, which is detachably mounted on the positioning fixture, and the clamping body is positioned and clamped by lifting and lowering the pressure plate and the horizontal frame of the bracket.

[0015] The application occasion of this technical solution is when grinding a curved surface. First, the sample block is installed on a clamp body, and then the clamp body is installed on a positioning fixture. The adjustability of the curved surface curvature can be achieved by changing the length of the clamp body to adapt to the different size requirements of the sample block curvature in various test standards.

[0016] Preferably, the clamp body comprises a clamping part, an extension rod and two spring sheets; the clamping part and the extension rod are integrally formed or fixedly connected, and the two spring sheets are symmetrically installed on both sides of the extension rod; a boss is provided on the side of the clamping part away from the extension rod; a positioning boss matched with the size of the sample block is provided on the end face of the extension rod away from the clamping part; the spring sheet comprises an installation adjustment part and a clamping part, the clamping part is obtained by bending the spring sheet, the installation adjustment part is connected to the extension rod by screws, the clamping parts of the two spring sheets are bent in opposite directions, and the clamping part is located on the side of the extension rod away from the clamping part.

[0017] In the present technical solution, the design of the boss on the clamping part ensures the positioning accuracy of the clamping base and the positioning fixture. The setting of the positioning boss on the extension rod realizes the accurate positioning of the workpiece. Different sample block sizes can set the positioning boss to a size suitable for it to achieve simple and accurate positioning. The design of clamping by spring clips realizes simple, safe and reliable locking.

[0018] Preferably, two positioning pins are arranged between the bottom plate and the horizontal plate, and a screw through hole is arranged on the horizontal plate. The screw through hole is an arc groove with the center of the swivel pin hole as the center of the circle.

[0019] In this technical solution, two positioning pins need to be installed only when grinding a flat surface. This setting ensures the matching accuracy between the positioning fixture and the base plate, and thus ensures the accuracy requirements of the flat surface grinding. The design of the screw through hole as an arc groove plays a role in avoiding the screw, so that when grinding an arc surface, there is no need to completely unscrew the screw, only to loosen it to achieve the rotation of the positioning fixture. This design improves work efficiency.

[0020] Preferably, the feed assembly is signal-connected with a digital display device.

[0021] By adopting this technical solution, the size of the sample block is accurate. No manual measurement is required during the grinding process, only accurate readings are required. This eliminates the trouble of using a vernier caliper and the errors caused by manual measurement.

[0022] On the other hand, the present invention provides a method for grinding a curved surface of a sample block, wherein the method uses a multifunctional sample block grinding mechanism to perform the following steps:

[0023] Embed the cut sample into the positioning fixture and clamp it in place;

[0024] Adjust the position of the positioning fixture through the feed assembly so that the grinding wheel just touches the sample block;

[0025] Remove or loosen the screws connecting the base plate and the support, leaving only the swivel pin;

[0026] Start the grinding head assembly, manually control the positioning fixture to rotate around the swivel pin, and grind out an arc surface with a preset diameter.

[0027] Preferably, the specific steps of embedding the cut sample into the positioning fixture for positioning and clamping are as follows:

[0028] The sample block is mounted on the clamp body, the sample block is positioned by a positioning boss that matches its size, and the spring is adjusted to clamp it;

[0029] Install the clamp body onto the positioning fixture, and position and clamp it by raising and lowering the pressure plate and the cross frame of the bracket.

[0030] By adopting the above technical solution, the precise positioning of the sample block is achieved when grinding the curved surface, the processing accuracy of the sample block is guaranteed, and the adjustability of the curvature of the sample block is achieved, thereby realizing the universal performance of the grinding mechanism.

[0031] In summary, the present invention has the following beneficial technical effects:

[0032] 1. In the technical solution in which the base plate and the support are connected by a swivel pin and a screw, when grinding the plane of the sample block, the screw is tightened to lock the base plate and the support. At this time, the surface to be processed of the grinding sample block is parallel to the grinding wheel surface, and plane grinding can be performed; when grinding the curved surface of the sample block, the screw is unscrewed or loosened, leaving only the swivel pin. At this time, the support can realize circular motion around the swivel pin with the positioning fixture, and the sample block can be rotated and fed at the same time to realize curved surface grinding; it is realized that both flat and curved surfaces can be ground on one grinding mechanism; these two functions improve work efficiency and sample block grinding quality and reduce equipment costs.

[0033] 2. By adopting the technical solution of threading the lifting and lowering pressure plate on the lifting screw rod, the lifting and lowering pressure plate can cooperate with the upper horizontal frame to position and clamp the workpiece upward, and the lifting and lowering pressure plate can cooperate with the lower horizontal frame to position and clamp the workpiece downward. One structural member has two positioning and clamping structures, which is ingeniously designed and low-cost. In addition, the design of the slide groove ensures the straightness of the lifting and lowering pressure plate, thereby ensuring the positioning accuracy of the workpiece. At the same time, the setting of positioning groove one, positioning groove two, positioning groove three and positioning groove four ensures the positioning accuracy of the positioning fixture to the workpiece, thereby improving the grinding quality.

[0034] 3. By adopting the technical solution of first installing the sample block on the clamp body and then installing the clamp body on the positioning fixture, the adjustability of the arc surface curvature can be achieved by changing the length of the clamp body to adapt to the different size requirements of the sample block curvature in various test standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the multifunctional grinding mechanism grinding the arc surface;

[0036] Figure 2 It is a schematic diagram of the grinding plane of the multifunctional grinding mechanism;

[0037] Figure 3 is a schematic diagram of the grinding mechanism and positioning fixture;

[0038] Figure 4 yes Figure 1 A partial enlarged view of point Ⅰ in the middle;

[0039] Figure 5 yes Figure 2 A partial enlarged view of the middle II;

[0040] Figure 6 It is a schematic diagram of the clamping concrete;

[0041] Figure 7 It is a schematic diagram of the shrapnel.

[0042] Description of reference numerals: 1- grinding head assembly;

[0043] 2-grinding support; 21-bottom plate; 22-support; 221-horizontal plate; 222-vertical plate; 223-reinforcement rib plate; 23-swivel pin; 24-screw; 25-positioning pin; 26-screw through hole;

[0044] 3-positioning fixture; 31-bracket; 32-lifting screw rod; 33-lifting and lowering plate; 34-slide; 35-positioning slot 1; 36-positioning slot 2; 37-positioning slot 3; 38-positioning slot 4; 39-knob;

[0045] 4-clamping body; 41-clamping part; 42-extension rod; 43-spring; 431-installation adjustment part; 432-clamping part; 44-boss; 45-positioning boss;

[0046] 5-Sample block. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0048] Example 1

[0049] This embodiment discloses a multifunctional sample block grinding mechanism. Figure 1 and Figure 3 , including a multifunctional sample block grinding mechanism, including a grinding head assembly 1 and a feeding assembly, a grinding support 2 and a positioning fixture 3; the grinding support 2 is arranged on the feeding assembly and is located on the side where the grinding wheel in the grinding head assembly 1 is located; the grinding support 2 includes a base plate 21 and a support 22, the base plate 21 and the support 22 are connected by a swivel pin 23 and a screw 24, and the swivel pin 23 is located at the center position of the support 22 in the width direction; the positioning fixture 3 positions and clamps the sample block 5, and the positioning fixture 3 is detachably mounted on the support 22 of the grinding support 2.

[0050] Reference Figure 3The support 22 includes a horizontal plate 221 and a vertical plate 222, the horizontal plate 221 and the vertical plate 222 are vertically fixedly connected, the horizontal plate 221 is connected to the bottom plate 21, and the vertical plate 222 is connected to the positioning fixture 3. Reinforcing ribs 223 are arranged on the vertical surfaces of the horizontal plate 221 and the vertical plate 222 away from the positioning fixture.

[0051] Reference Figure 1 and Figure 2 The positioning fixture 3 includes a bracket 31, a lifting screw rod 32 and a lifting and pressing plate 33; the bracket 31 is detachably connected to the vertical plate 222 of the support 22, and the bracket 31 is a vertically arranged rectangular frame structure; the lifting screw rod 32 longitudinally passes through the upper horizontal frame and the lower horizontal frame of the bracket 31, and is connected to the upper horizontal frame and the lower horizontal frame bearings, and a knob 39 is provided at the upper end of the lifting screw rod 32; the lifting and pressing plate 33 is threadedly matched with the lifting screw rod 32, and the lifting and pressing plate 33 is slidably connected with the two vertical frames of the bracket 31, and the two vertical frames of the bracket 31 are respectively provided with sliding grooves 34 that cooperate with the two ends of the lifting and pressing plate 33.

[0052] Reference Figure 1 and Figure 4 A positioning groove 1 35 is provided at the lower end of the side surface of the upper horizontal frame of the bracket 31 away from the vertical plate 222, a positioning groove 2 36 is provided at the upper end of the side surface of the lower horizontal frame of the bracket 31 away from the vertical plate 222, and a positioning groove 37 is provided at the upper end of the side surface of the lifting and pressing plate 33 away from the vertical plate 222.

[0053] Reference Figure 2 and Figure 5 A positioning groove 4 38 is provided at the lower end of the side surface of the lifting and pressing plate 33 away from the vertical plate 222, the groove depth of the positioning groove 1 35 is the same as that of the positioning groove 3 37, and the groove depth of the positioning groove 2 36 is the same as that of the positioning groove 4 38.

[0054] Reference Figure 1 The sample grinding mechanism in FIG. 6 also includes a clamp body 4, which is detachably mounted on the positioning fixture 3, and is positioned and clamped by the lifting and lowering pressure plate 33 and the cross frame of the bracket 31. The clamp body 4 includes a clamping portion 41, an extension rod 42, and two springs 43; the clamping portion 41 and the extension rod 42 are integrally formed or fixedly connected, and the two springs 43 are symmetrically mounted on both sides of the extension rod 42; a boss 44 is provided on the side of the clamping portion 41 away from the extension rod 42; a positioning boss 45 adapted to the size of the sample 5 is provided on the end face of the extension rod 42 away from the clamping portion 41; refer to FIG. Figure 7 The spring sheet 43 includes an installation adjustment portion 431 and a clamping portion 432. The clamping portion 432 is obtained by bending the spring sheet 43. The installation adjustment portion 431 is connected to the extension rod 42 by a screw 24. The clamping portions 432 of the two spring sheets 43 are bent in opposite directions. The clamping portion 432 is located on the side of the extension rod 42 away from the clamping portion 41.

[0055] Reference Figure 3 Two positioning pins 25 are also provided between the bottom plate 21 and the horizontal plate 221 to position the bottom plate. A screw through hole 26 is provided on the horizontal plate 221. The screw through hole 26 is an arc groove with the center of the rotating pin 23 hole as the center of the circle. The signal on the feed assembly is connected with a digital display device.

[0056] Example 2

[0057] This embodiment discloses a method for grinding a curved surface of a sample block, referring to Figure 1 and Figure 6 In this embodiment, the multifunctional sample block grinding mechanism in embodiment 1 is used to perform the following steps:

[0058] 1. The cut sample block 5 is embedded in the positioning fixture 3 for positioning and clamping. The specific steps are as follows: first, the sample block 5 is installed on the clamp body 4. The sample block 5 is positioned by the positioning boss 45 that matches its size, and the spring piece 43 is adjusted to clamp it; then the clamp body 4 is installed on the positioning fixture 3, and the rotating knob 39 is positioned and clamped through the lifting and lowering pressure plate 33 and the lower horizontal frame of the bracket 31, and positioned through the positioning groove four 38 and the positioning groove two 36. The reason for choosing the lifting and lowering pressure plate 33 and the lower horizontal frame of the bracket 31 for positioning and clamping is to avoid the position in the middle of the grinding wheel where there is no grinding wheel, so as to ensure that the grinding wheel can cover the entire processed surface of the sample block 5.

[0059] 2. Adjust the position of the positioning fixture 3 through the feeding assembly so that the grinding wheel just contacts the sample block 5;

[0060] 3. Remove or loosen the screws 24 connecting the base plate 21 and the support 22, leaving only the swivel pin 23;

[0061] 4. Start the grinding head assembly 1, manually control the positioning fixture 3 to rotate around the swivel pin 23, and grind out a circular surface with a preset diameter.

[0062] Example 3

[0063] This embodiment discloses a sample block surface grinding method. The multifunctional sample block grinding mechanism used in this embodiment is different from that in Embodiment 1 in that the clamping body 4 is not included.

[0064] Reference Figure 2 , the specific steps are:

[0065] 1. Place the cut sample block 5 into the positioning groove 1 35, then rotate the knob 39 to raise the lifting and pressing plate 33, so that the lower end of the sample block 5 is inserted into the positioning groove 3 37 of the lifting and pressing plate, and the sample block 5 is clamped by the lifting and pressing plate 33 and the upper horizontal frame of the bracket 31.

[0066] 2. Grind the first plane of the sample block 5 until it is flat;

[0067] 3. Loosen the lifting and pressing plate 33, take out the sample block 5, clean the positioning groove, stick the flattened side into the positioning groove 1 35 and the positioning groove 3 37, and re-clamp the sample block 5;

[0068] 4. Adjust the feed assembly so that the grinding wheel just contacts the sample block 5. At this time, reset the ruler to zero, start the grinding head assembly, and feed through the feed assembly, and then grind the second surface for the second time until the target size is reached.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A multifunctional sample block grinding mechanism, comprising a grinding head assembly (1) and a feeding assembly, characterized in that: It also includes a grinding support (2) and a positioning fixture (3); The grinding support (2) is arranged on the feed assembly and is located on the side where the grinding wheel in the grinding head assembly (1) is located; The grinding support (2) comprises a base plate (21) and a support (22), wherein the base plate (21) and the support (22) are connected via a swivel pin (23) and a screw (24), wherein the swivel pin (23) is located at a central position of the support (22) in a width direction; The positioning fixture (3) positions and clamps the sample block (5), and the positioning fixture (3) is detachably mounted on a support (22) of the grinding support (2); The support (22) comprises a horizontal plate (221) and a vertical plate (222), wherein the horizontal plate (221) and the vertical plate (222) are vertically fixedly connected, the horizontal plate (221) is connected to the bottom plate (21), and the vertical plate (222) is connected to the positioning fixture (3); The positioning fixture (3) comprises a bracket (31), a lifting screw rod (32) and a lifting pressure plate (33); The bracket (31) is detachably connected to the vertical plate (222) of the support (22), and the bracket (31) is a vertically arranged rectangular frame structure; The lifting screw rod (32) passes through the upper horizontal frame and the lower horizontal frame of the bracket (31) in the longitudinal direction and is connected to the bearings of the upper horizontal frame and the lower horizontal frame. The upper end of the lifting screw rod (32) is provided with a knob (39); The lifting and pressing plate (33) is threadedly matched with the lifting screw rod (32), and the lifting and pressing plate (33) is slidably connected with the two vertical frames of the bracket (31), and the two vertical frames of the bracket (31) are respectively provided with sliding grooves (34) that match the two ends of the lifting and pressing plate (33); A first positioning groove (35) is provided at the lower end of the side surface of the upper horizontal frame of the bracket (31) away from the vertical plate (222), a second positioning groove (36) is provided at the upper end of the side surface of the lower horizontal frame of the bracket (31) away from the vertical plate (222), a third positioning groove (37) is provided at the upper end of the side surface of the lifting and pressing plate (33) away from the vertical plate (222), and a fourth positioning groove (38) is provided at the lower end of the side surface of the lifting and pressing plate (33) away from the vertical plate (222), the first positioning groove (35) and the third positioning groove (37) have the same groove depth, and the second positioning groove (36) and the fourth positioning groove (38) have the same groove depth.

2. A multifunctional sample block grinding mechanism according to claim 1, characterized in that: It also includes a clamp body (4), the clamp body (4) being detachably mounted on the positioning fixture (3), the clamp body (4) being positioned and clamped by lifting and lowering the pressure plate (33) and the upper horizontal frame or the lower horizontal frame of the bracket (31); The clamp body (4) comprises a clamping portion (41), an extension rod (42) and two spring sheets (43); The clamping portion (41) and the extension rod (42) are integrally formed or fixedly connected, and the two spring sheets (43) are symmetrically mounted on both sides of the extension rod (42); A boss (44) is provided on the side of the clamping portion (41) away from the extension rod (42); A positioning boss (45) matching the size of the sample block (5) is provided on the end surface of the extension rod (42) away from the clamping portion (41); The spring sheet (43) comprises a mounting adjustment portion (431) and a clamping portion (432); the clamping portion (432) is obtained by bending the spring sheet (43); the mounting adjustment portion (431) is connected to the extension rod (42) via a screw (24); the clamping portions (432) of the two spring sheets (43) are bent in opposite directions; the clamping portions (432) are located on a side of the extension rod (42) away from the clamping portion (41).

3. A multifunctional sample block grinding mechanism according to claim 2, characterized in that: Two positioning pins (25) are also provided between the bottom plate (21) and the horizontal plate (221) for positioning. The horizontal plate (221) is provided with a screw through hole (26), and the screw through hole (26) is an arc groove with the center of the swivel pin (23) hole as the center.

4. A multifunctional sample block grinding mechanism according to claim 2, characterized in that: The feed assembly is signal-connected with a digital display device.

5. A method for grinding a curved surface of a sample block, based on the multifunctional sample block grinding mechanism according to any one of claims 2 to 4, characterized in that: Use the multifunctional specimen grinding mechanism to perform the following steps: The cut sample (5) is inserted into the positioning fixture (3) for positioning and clamping; The position of the positioning fixture (3) is adjusted by the feed assembly so that the grinding wheel and the sample block (5) just come into contact; Remove or loosen the screws (24) connecting the base plate (21) and the support (22), leaving only the swivel pin (23); The grinding head assembly (1) is started, and the positioning fixture (3) is manually controlled to rotate around the swivel pin (23) to grind out a circular surface with a preset diameter; The specific steps of embedding the cut sample block (5) into the positioning fixture (3) for positioning and clamping are as follows: The sample block (5) is mounted on the clamp body (4), the sample block (5) is positioned by a positioning boss (45) that matches its size, and the spring sheet (43) is adjusted to clamp it; The clamp body (4) is mounted on the positioning fixture (3), and is positioned and clamped by lifting and lowering the pressure plate (33) and the upper horizontal frame or the lower horizontal frame of the bracket (31).

Images