Plate tensile sample machining clamp

Abstract

The utility model discloses a plate tensile sample machining clamp, and belongs to the technical field of metal machining. The upper pressing plate is fastened to the upper portion of the lower supporting plate, and a plate to be machined is located between the lower supporting plate and the upper pressing plate; the pressing mechanism abuts against the edge of the upper end face of the supporting plate and presses the edge of the upper end face of the supporting plate; the width of the upper end face of the lower supporting plate is smaller than that of a machined plate, and the width of the lower end face of the upper pressing plate is smaller than that of the machined plate. The upper pressing plate and the lower supporting plate are locked, so that an internal plate can be pressed, then the two sides of the lower supporting plate are pressed through the pressing mechanism, a numerical control machine tool machines the plate from the front side and the rear side of the clamp, needed shapes can be machined on the two sides of the plate, and the clamp is simple in structure and convenient to use. And the processing, loading and unloading time of the plate on the clamp can be shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of metal processing, in particular to a processing fixture for a sheet metal tensile specimen. Background Technique

[0002] Before the tensile test, various tensile specimens need to be processed according to requirements, and then the tensile specimens are placed in a tensile testing machine and broken to test their performance. When processing the tensile specimens, generally multiple rectangular thin plates are stacked, and a numerically controlled machine tool is used to process them into a suitable shape. For example, Figure 1a as shown, the middle part of the rectangular thin plate is processed into a narrower rectangle with a width of b, the transition between the middle part and both ends is processed into a fillet, and both left and right ends are not processed. Currently, the conventional processing of tensile specimens is carried out on a horizontal machine tool and clamped by a flat-jaw vice. As Figure 1b shown, a hob is used to mill one side of the sheet metal first, and then the sheet metal is flipped and clamped to mill the other side. In order to ensure the processing effect, a center line 61 of the vice needs to be drawn on the vice, and a center line 21 of the sheet metal also needs to be drawn on the stacked thin plates. After flipping, ensure that the two center lines are aligned. A set of tensile specimens needs to be clamped twice to process the required shape. And there are three problems: one is that the longitudinal alignment at the fillet is not aligned; the second is that the two sides after processing cannot be guaranteed to be parallel; the third is that a horizontal milling cut needs to be made after the first clamping, increasing the workload. In short, using the existing conventional machining tooling fixture to frequently load and unload the sheet metal is time-consuming and laborious, unable to guarantee the machining accuracy and reducing the effective machining time of the numerically controlled machine tool.

[0003] The utility model patent ZL202121253296.X, a sheet metal processing fixture structure, includes: a machine tool workbench part, and fixture components arranged on both sides of the machine tool workbench part; the fixture components include a clamping cylinder, a backing plate, and a pressing plate; the clamping cylinder is connected to the machine tool workbench part, and the telescopic end of the clamping cylinder passes through the backing plate and is connected to the pressing plate, and the backing plate is also connected to the machine tool workbench part. This fixture places the workpiece on the backing plate, and the clamping cylinder drives the pressing plate to descend to press the workpiece. The structure of the fixture component is complex and the operation is cumbersome. Content of the Utility Model

[0004] The purpose of the utility model is to provide a processing fixture for a sheet metal tensile specimen. By locking between the upper pressing plate and the lower supporting plate, the internal sheet metal can be pressed tightly, and the numerically controlled machine tool processes the sheet metal from the front side and the rear side of the fixture, so that the required shape can be processed on both sides of the sheet metal.

[0005] The utility model provides the following solution:

[0006] The utility model describes a processing fixture for a sheet metal tensile specimen, including:

[0007] A lower supporting plate;

[0008] The upper pressing plate is fastened to the upper part of the lower support plate, and the plate to be processed is located between the lower support plate and the upper pressing plate;

[0009] The pressing mechanism is in contact with and presses against the edge of the upper end surface of the support plate;

[0010] The width of the upper end surface of the lower support plate is smaller than the width of the plate after processing, and the width of the lower end surface of the upper pressing plate is smaller than the width of the plate after processing.

[0011] Preferably, the lower end surface of the upper pressing plate is an arc surface protruding downward.

[0012] Preferably, the suspension height H of the arc surface ranges from 3.5 to 5 mm.

[0013] Preferably, a first bolt is further included;

[0014] Mounting holes are symmetrically arranged on both sides of the upper end surface of the lower support plate, and the plate is located between the mounting holes on both sides;

[0015] Through holes are provided at positions corresponding to the mounting holes on the lower end surface of the upper pressing plate;

[0016] The first bolt sequentially passes through the through hole and the mounting hole to fasten the upper pressing plate and the lower support plate.

[0017] Preferably, a spherical washer is sleeved at the lower end of the bolt head of the first bolt;

[0018] A central hole for sleeving the first bolt is provided on the spherical washer, and a first spherical surface is provided along the circumferential direction of the central hole;

[0019] A second spherical surface that is in shape-fitting contact with the first spherical surface is provided on the lower end surface of the bolt head of the first bolt.

[0020] Preferably, the pressing mechanism includes: a pressing block, a support block and a fixing rod;

[0021] The first end of the pressing block presses on the upper end surface of the lower support plate, the second end is supported on the support block, and the pressing block is pressed on the upper end surface of the lower support plate through the fixing rod.

[0022] Preferably, a threaded hole is provided on the pressing block, and the upper end of the fixing rod passes through the threaded hole and is fastened by a second bolt.

[0023] Preferably, through holes penetrating the front and back are provided on the lower support plate.

[0024] Preferably, chamfers are provided on both sides of the upper end of the lower support plate.

[0025] The utility model has the following advantages compared with the prior art:

[0026] 1. The processing fixture for the sheet tensile specimen of the present utility model can achieve the pressing of the internal sheet by locking between the upper pressing plate and the lower supporting plate. The numerical control machine tool processes the sheet from the front side and the rear side of the fixture, and the required shapes can be processed on both sides of the sheet. The fixture has a simple structure, can shorten the processing, loading and unloading time of the sheet on the fixture, improve the effective processing time of the numerical control machine tool, and improve the utilization rate of the numerical control machine tool.

[0027] 2. The lower end surface of the upper pressing plate of the present utility model is a downwardly convex arc surface, which can uniformly press each part of the sheet to be processed and ensure the processing accuracy of the subsequent numerical control machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1a It is the top view of the sheet tensile specimen after being processed by the numerical control machine tool;

[0030] Figure 1b It is the schematic diagram of clamping the sheet with a flat-jaw vice;

[0031] Figure 2 It is the overall structure schematic diagram of the fixture of the present utility model and the sheet to be processed;

[0032] Figure 3 It is the front view of the upper pressing plate of the present utility model;

[0033] Figure 4 It is the front view of the upper pressing plate of another shape of the present utility model;

[0034] Figure 5 It is the top view of the upper pressing plate of the present utility model;

[0035] Figure 6 It is the structure schematic diagram of the lower supporting plate of the present utility model;

[0036] Figure 7 It is the structure schematic diagram of the lower supporting plate with a chamfer of the present utility model;

[0037] Figure 8 It is the sectional view when the spherical washer and the first bolt of the present utility model are assembled;

[0038] Figure 9 It is the structure schematic diagram of the pressing mechanism of the present utility model;

[0039] Figure 10 This is a schematic structural view of the machine tool workbench of the present utility model;

[0040] In the figure:

[0041] 1. Machine tool workbench; 2. Plate; 21. Plate center line; 3. Clamping mechanism; 31. Pressure block; 32. Support block; 33. Fixed rod; 34. Second bolt; 41. Spherical gasket; 42. First bolt; 51. Lower support plate; 51a. Light hole; 51b. Mounting hole; 51c. Chamfer; 52. Upper pressing plate; 52a. Arc surface; 52b. Through hole; 6. Parallel jaw vice; 61. Vice center line. Specific embodiments

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0043] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0044] It should be understood that the term " / and / " used herein is only a description of the associated relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0045] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application for description, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first can also be called the second, and similarly, the second can also be called the first.

[0046] Depending on the context, as used herein, the words "if" and "when" may be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" may be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0047] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a commodity or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the commodity or device comprising said element.

[0048] It should be particularly noted that symbols and / or numbers present in the specification, if not marked in the drawings description, are not drawing reference numerals.

[0049] Embodiment 1

[0050] See Figure 2 、 Figure 10 As shown, a processing fixture for a sheet metal tensile specimen provided by an embodiment of the present application includes:

[0051] A lower support plate 51; an upper pressing plate 52, the upper pressing plate 52 is fastened to the upper part of the lower support plate 51, and the sheet metal 2 to be processed is located between the lower support plate 51 and the upper pressing plate 52; a pressing mechanism 3, the pressing mechanism 3 abuts against and presses on the edge of the upper end surface of the support plate 51; the width of the upper end surface of the lower support plate 51 is smaller than the width b of the sheet metal 2 after processing, and the width of the lower end surface of the upper pressing plate 52 is smaller than the width b of the sheet metal 2 after processing.

[0052] The lower support plate 51 is installed in the T-shaped installation groove of the machine tool workbench 1 and is pressed and fixed in the machine tool workbench 1 by the pressing mechanisms 3 on both sides. The sheet metal 2 to be processed is placed above the lower support plate 51, and the upper pressing plate 52 and the lower support plate 51 are locked to fix the sheet metal 2 to be processed. Since the width of the upper end surface of the lower support plate 51 is smaller than the width b of the sheet metal 2 after processing, and the width of the lower end surface of the upper pressing plate 52 is smaller than the width b of the sheet metal 2 after processing, at this time, the part of the sheet metal 2 that needs to be processed is exposed outside the fixture, and the machine tool can process the sheet metal 2 from the front side and the rear side of the fixture without interference. Without secondary clamping, the required shape can be processed on both sides of the sheet metal. The fixture structure is simple, which can shorten the processing, loading and unloading time of the sheet metal on the fixture, improve the effective processing time of the numerical control machine tool, and improve the utilization rate of the numerical control machine tool.

[0053] SeeFigures 3-4 As shown, the lower end face of the upper pressing plate 52 is an arc surface 52a protruding downward. When the upper pressing plate 52 is locked with the lower supporting plate 51, each part of the plate 2 is evenly pressed by the upper pressing plate 52.

[0054] See Figures 3-4 As shown, the upper end face and the lower end face of the upper pressing plate 52 have the same shape, both having an arc surface protruding downward, or the upper end face is a flat surface. The thickness range of the upper pressing plate 52 is 10 - 15 mm, and the overhang height H of the arc surface 52a (i.e., the vertical distance between the edge of the lower end face of the upper pressing plate 52 and the lowest point of the lower end face) ranges from 3.5 - 5 mm. The tensile strength range is 1200 - 1500 MPa, the yield strength range is 1000 - 1300 MPa. When it is made of 65Mn and undergoes quenching and tempering treatment, and the hardness reaches HRC48 - 55, it has a better pressing effect.

[0055] See Figure 2 、 3 As shown in FIGS. 4, 5, 6, and 8, it further includes a first bolt 42; mounting holes 51b are symmetrically provided on both sides of the upper end face of the lower supporting plate 51, and the plate 2 is located between the two mounting holes 51b; through holes 52b are provided at positions corresponding to the mounting holes 51b on the lower end face of the upper pressing plate 52; the first bolt 42 sequentially passes through the through holes 52b and the mounting holes 51b to fasten the upper pressing plate 52 and the lower supporting plate 51. In this embodiment, the model of the first bolt 42 is M16.

[0056] The first bolt 42 locks the upper pressing plate 52 and the lower supporting plate 51, realizing the fixation of the plate 2 between the upper pressing plate 52 and the lower supporting plate 51. This structure is easy to assemble and disassemble, has a simple structure, and is convenient to operate.

[0057] See Figure 8 As shown, a spherical surface gasket 41 is sleeved at the lower end of the bolt head of the first bolt 42; a central hole for sleeving the first bolt 42 is provided on the spherical surface gasket 41, and a first spherical surface is provided along the circumferential direction of the central hole; a second spherical surface that is in shape - matching contact with the first spherical surface is provided on the lower end face of the bolt head of the first bolt 42.

[0058] The first spherical surface and the second spherical surface that are in mutual - cooperation contact are provided on the lower end face of the bolt head and the spherical surface gasket 41, thus ensuring that the connection between the bolt head and the spherical surface gasket is more stable, not prone to shaking, and improving the stability during locking; using the spherical surface gasket 41 to press on the through hole 52b, the shape of the through hole 52b can be designed into various shapes as long as it can be covered by the spherical surface gasket 41. In this embodiment, the through hole 52b is oblong and corresponds to multiple mounting holes 51b, eliminating the need to drill through holes 52b corresponding to the mounting holes 51b one by one on the upper pressing plate 52, simplifying the processing of the upper pressing plate 52.

[0059] See Figure 9As shown in the figure, the pressing mechanism 3 includes: a pressing block 31, a supporting block 32 and a fixing rod 33; one end of the pressing block 31 presses on the upper end surface of the lower support plate 51, the other end is supported on the supporting block 32, and the pressing block 31 is pressed on the upper end surface of the lower support plate 51 through the fixing rod 33.

[0060] The pressing block 31 is fixed on the fixing rod 33 and provides a downward pressing force on the upper end surface of the lower support plate 51. In order to prevent the pressing block 31 from being lifted by the upper end surface of the lower support plate 51 and failing to play a pressing role, a supporting block 32 is arranged below the other end of the pressing block 31, and the lower end surfaces of both ends of the pressing block are at the same height. The upper end surface of the supporting block 32 is 0.5 mm higher than the upper end surface of the lower support plate 51. The supporting block 32 provides an upward supporting force for the pressing block 31 to ensure that the pressing block can stably press on the upper end surface of the lower support plate 51.

[0061] See Figure 9 As shown in the figure, a threaded hole is provided on the pressing block 31. The upper end of the fixing rod 33 passes through the threaded hole and is fastened by a second bolt 34. In this embodiment, the model of the second bolt 34 is M12.

[0062] In this embodiment, the fixing rod 33 is a T-shaped bolt. The bolt head of the T-shaped bolt is installed in the T-shaped installation groove of the machine tool workbench 1, and the lower support plate 51 is knocked into the T-shaped installation groove by a rubber hammer.

[0063] The pressing block 31 is screwed onto the fixing rod 33 to fix the pressing block 31 on the fixing rod 33. The second bolt 34 is arranged above the pressing block 31 and tightened with the fixing rod 33 to fasten the pressing block 31, so that the pressing block 31 can stably press on the upper end surface of the lower support plate 51; and the height of the pressing block 31 on the fixing rod 33 can be changed according to the height of the upper end surface of the lower support plate 51, so as to cope with the lower support plates 51 of different heights and improve the flexibility during assembly.

[0064] See Figure 6 As shown in the figure, a through light hole 51a is provided on the lower support plate 51. The diameter of the light hole 51a is When it is necessary to disassemble the lower support plate 51, a steel bar with a diameter smaller than can be passed through the light hole 51a to pry it.

[0065] Embodiment 2

[0066] This embodiment provides a processing fixture for a sheet metal tensile specimen. The difference between this embodiment and Embodiment 1 lies in the different shape of the lower support plate 51.

[0067] See Figure 7As shown, chamfered corners 51c are provided on both sides of the upper end of the lower support plate 51. The pressing mechanism 3 presses against the chamfered corners 51c. Since the height of the contact surface between the chamfered corners 51c and the pressing mechanism 3 is less than the height of the upper end surface of the lower support plate 51, the height of the pressing mechanism 3 can be reduced, so that the numerical control machine will not be obstructed by the overly high pressing mechanism 3 during machining and other operations.

[0068] The working principle of the present utility model is as follows:

[0069] Place the plate 2 to be machined on the lower support plate 51, press the upper pressing plate 52 on the plate 2, and then the first bolt 42 sequentially passes through the spherical gasket 41, the through hole 52b and the mounting hole 51b and is screwed, fixing the plate 2. After selecting the program, the numerical control machine completes the machining of both sides of the plate 2. Loosen the first bolt 42 to remove the machined tensile specimen.

[0070] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0071] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A plate tensile specimen processing fixture, characterized in that: include: Lower support plate (51); An upper pressing plate (52), wherein the upper pressing plate (52) is fastened to the upper portion of the lower supporting plate (51), and the plate (2) to be processed is located between the lower supporting plate (51) and the upper pressing plate (52); A clamping mechanism (3), the clamping mechanism (3) abuts against and clamps the edge of the upper end surface of the support plate (51); The width of the upper end surface of the lower support plate (51) is smaller than the width of the plate (2) after processing, and the width of the lower end surface of the upper pressing plate (52) is smaller than the width of the plate (2) after processing.

2. The plate tensile specimen processing fixture according to claim 1 is characterized in that: The lower end surface of the upper pressing plate (52) is a downwardly convex curved surface (52a).

3. The plate tensile specimen processing fixture according to claim 2, characterized in that: The range of the hanging height H of the arc surface (52a) is 3.5-5mm.

4. The plate tensile specimen processing fixture according to claim 1, characterized in that: Also includes a first bolt (42); The upper end surface of the lower support plate (51) is symmetrically provided with mounting holes (51b) on both sides, and the plate (2) is located between the mounting holes (51b) on both sides; A through hole (52b) is provided at a position on the lower end surface of the upper pressing plate (52) corresponding to the mounting hole (51b); The first bolt (42) passes through the through hole (52b) and the mounting hole (51b) in sequence to fasten the upper pressing plate (52) and the lower supporting plate (51).

5. The plate tensile specimen processing fixture according to claim 4, characterized in that: A spherical gasket (41) is sleeved on the lower end of the bolt head of the first bolt (42); The spherical gasket (41) is provided with a center hole sleeved with the first bolt (42), and the center hole is provided with a first spherical surface along the circumferential direction; The lower end surface of the bolt head of the first bolt (42) is provided with a second spherical surface that cooperates with and abuts against the first spherical surface.

6. The plate tensile specimen processing fixture according to claim 1, characterized in that: The clamping mechanism (3) comprises: a pressing block (31), a supporting block (32) and a fixing rod (33); The first end of the pressing block (31) is pressed on the upper end surface of the lower support plate (51), and the second end is supported on the support block (32). The pressing block (31) is pressed against the upper end surface of the lower support plate (51) via the fixing rod (33).

7. The plate tensile specimen processing fixture according to claim 6, characterized in that: The pressing block (31) is provided with a threaded hole, and the upper end of the fixing rod (33) passes through the threaded hole and is fastened by a second bolt (34).

8. The plate tensile specimen processing fixture according to claim 1, characterized in that: The lower support plate (51) is provided with a light hole (51a) penetrating the front and rear.

9. The plate tensile specimen processing fixture according to claim 1, characterized in that: Cut corners (51c) are provided on both sides of the upper end of the lower support plate (51).

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