CN107262858B - Positioning device and processing system - Google Patents

Abstract

A positioning device and a processing system belong to the field of mechanical processing. And the positioning device is used for positioning the mountain-shaped notch sample so as to process the mountain-shaped notch. The positioning device comprises a base, a workpiece frame and a limiting piece. The base is connected with processing equipment for processing mountain-shaped notch samples. The work rest is provided with a limit space for accommodating the mountain-shaped notch sample. The limiting piece comprises a positioning piece and a clamping piece so as to clamp and limit the sample. The positioning device can realize a good positioning function, so that the positioning accuracy is improved.

Description

Positioning device and processing system

Technical Field

The invention relates to the field of machining, in particular to a positioning device and a machining system.

Background

In the practical application process of metal materials such as aluminum alloy, steel, titanium alloy and the like, in order to meet the requirements of material characteristics and safety application, the toughness performance of the material for resisting crack propagation and fracture needs to be tested and evaluated so as to characterize the capability of the material for resisting crack propagation, thereby measuring the toughness of the material.

In the fracture toughness testing of metallic materials, it is desirable to have a sufficiently high stress concentration effect at the crack tip of the material. Therefore, before testing, the sample needs to be grooved (a main body part of a crack is prepared) by a machining method, and then a fatigue machine is used for prefabricating sharp fatigue cracks on the basis of grooving so as to meet the requirements of fracture toughness test.

According to the requirements of national standard GB/T1-7 and American standard ASTM E-2, the fracture toughness slotting notch has three forms, namely a straight-through notch, an envelope notch and a mountain notch. The first two slotting notches (straight notch and envelope notch) can be directly processed by adopting traditional wire cutting equipment. The third type of slotting notch, namely a mountain-shaped notch with angle requirements (the root of the notch forms a 90-degree or 120-degree notch angle with the upper surface and the lower surface of a sample), cannot be prepared by adopting a traditional wire cutting processing scheme, so that a plurality of practitioners can finish the preparation of the mountain-shaped notch on a milling machine.

However, due to the fact that the shape and the precision of a machining tool are limited when the milling machine is used for manufacturing, machining cost is increased on one hand, the slotting precision of the mountain-shaped notch is difficult to guarantee on the other hand, and even some workpieces with smaller slotting sizes cannot be machined by the milling machine. In addition, the slotting notch precision is critical to the fatigue crack precision of the subsequent prefabrication, and the final detection result of fracture toughness is directly affected, so that the toughness performance of the material, which is treated by adopting the method, for actually resisting crack propagation and fracture is checked and judged to lose reliability.

The above is a problem commonly existing in the preparation process of the fracture toughness test sample with the mountain-shaped notch, so that improvement and perfection of the preparation mode of the fracture toughness work piece with the mountain-shaped notch are necessary.

Disclosure of Invention

In a first aspect of the invention, a positioning device is provided, so that accurate positioning of mountain-shaped notch samples is effectively realized, machining precision is guaranteed, the capability of the materials for preventing crack propagation is accurately represented, and reliable guarantee is provided for application and safety evaluation of metal material products.

In a second aspect of the invention, a machining system is provided, which can accurately prepare and angle-change machine a mountain-shaped notch workpiece by adopting traditional wire cutting machining equipment, and ensure the accuracy and reliability of fracture toughness detection results.

The invention is realized in the following way:

a positioning device is used for positioning a mountain-shaped notch sample so as to process the mountain-shaped notch.

The positioning device comprises:

a base having a first connection portion having a connection surface configured to be connected with a processing apparatus that processes a mountain-shaped notched sample, and a second connection portion having an inclined surface;

the workpiece frame is connected to the inclined surface and is provided with a first wall and a second wall which are opposite to each other, the first wall and the second wall limit a limiting space for accommodating a mountain-shaped notch sample, and the limiting space is away from the inclined surface;

the limiting piece comprises a positioning piece and a clamping piece, wherein the positioning piece is connected to the first wall and the second wall respectively and seals a part of the limiting space, the clamping piece is connected to the second wall and can move relative to the first wall, and the workpiece clamping space is limited by the clamping piece, the positioning piece and the first wall.

In preferred examples, the base has a connection surface in contact with the processing equipment, and the inclined surface is inclined at 45 ° or 60 ° to the connection surface.

In preferred examples, the clamping member has a mating contact portion and a threaded connection portion, the connection portion being threadably connected to the second wall, the contact portion being connected to an end of the connection portion, the workpiece holding space being defined collectively by the contact portion, the positioning member and the first wall.

In preferred examples, the contact portion has a contact surface with the mountain-shaped notched sample, the contact surface having an area greater than the area of the connecting portion.

In some preferred examples, the contact portion is rotatably connected to the connection portion with an axial direction of the connection portion as a rotation center line.

In preferred examples, the clamping member further comprises a cylindrical member, the contact portion being connected to the connection portion by the cylindrical member such that the contact portion is free to swivel in an axial direction of the cylindrical member.

In preferred examples, the positioning member is connected to the work piece carrier by at least two connecting members, and the at least two connecting members are configured to be independently adjusted to change the relative position between the positioning member and the work piece carrier, respectively.

In preferred examples, the work rest is provided with a plurality of work track grooves configured as a path of movement for the processing apparatus to process the chevron notch samples.

In preferred examples, the workpiece holder has a second back-gouging groove in the spacing space, the second back-gouging groove being configured such that a root of the mountain gap sample is freely movably disposed in the second back-gouging groove when the mountain gap sample is confined to the workpiece holding space. The base is provided with a first back-gouging groove configured such that the projection of the processing apparatus is freely movably disposed within the first back-gouging groove when the work holder is connected to the processing apparatus.

A processing system comprising processing equipment, a positioning device as described above.

The beneficial effect of above-mentioned scheme:

the positioning device and the processing system provided by the embodiment of the invention particularly relate to accurate centering and accurate positioning in the mountain-shaped notch preparation process, overcome the defect that the mountain-shaped notch with an angle cannot be processed by traditional linear cutting equipment in the past, realize the preparation of a mountain-shaped notch fracture toughness sample on the basis of ensuring the processing precision and the geometric dimension, effectively ensure the accuracy of a fracture toughness sample detection result, and belong to the technical fields of fracture toughness sample preparation and a fracture toughness sample preparation method.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a positioning device according to an embodiment of the present invention;

FIG. 2 shows a schematic structural view of the base of FIG. 1 from a first perspective;

FIG. 3 shows a schematic structural view of the base of FIG. 1 from a second perspective;

FIG. 4 shows an enlarged view of a portion IV of FIG. 3;

FIG. 5 is a schematic view of the work piece carrier of FIG. 1 from a first perspective;

FIG. 6 is a schematic structural view of the workpiece holder of FIG. 1 from a second perspective;

FIG. 7 shows an enlarged view of a portion of the VII portion of FIG. 6;

FIG. 8 is a schematic view of the positioning member of FIG. 1;

FIG. 9 is a schematic view of the clamp of FIG. 1;

FIG. 10 is a schematic view of the end of the clamp of FIG. 9;

fig. 11 is a schematic view of the platen structure of the clamp of fig. 9.

Icon: 100-positioning device; 200-base; 300-a workpiece holder; 400-limiting piece; 500-positioning pieces; 600-clamping piece; 201-a first connection; 202-a second connection; 203-a first back-gouging tank; 204-inclined plane; 205-positioning grooves; 207-connection surface; 206-positioning holes; 301-positioning key; 302-a first wall; 303-a second wall; 304-a working track groove; 306-a second back-gouging tank; 501-adjusting holes; 602-contacts; 601-connection; 603-a pillar.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the present invention, all the embodiments, implementations and features of the invention may be combined with each other without contradiction or conflict. In the present invention, conventional equipment, devices, components, etc., are either commercially available or homemade in accordance with the present disclosure. In the present invention, some conventional operations and apparatuses, devices, components are omitted or only briefly described in order to highlight the gist of the present invention.

The positioning device 100 and the processing system provided by the invention belong to fracture toughness sample processing equipment and can be used for processing mountain-shaped notch samples. In practical applications, the positioning device 100 and the processing system can be applied to fracture toughness samples with mountain-shaped notches with two angle specifications of 90 ° and 120 °.

The processing system includes processing equipment and a positioning device 100. Wherein, the processing equipment is the equipment used for processing mountain-shaped breach sample. The positioning device 100 is connected to a machining apparatus, which is a wire cutting apparatus as an alternative example, and accordingly, the positioning apparatus is connected to an X-axis table of the wire cutting apparatus. The wire cutting device cuts through electrode wires (molybdenum wires or tungsten wires), and the electrode wires are connected with an upper wire frame and a lower wire frame.

Wherein, the X-axis workbench, the electrode wire, the upper wire frame and the lower wire frame can adopt equipment known by the inventor, and the invention is specifically described.

The positioning device 100 provided in this embodiment can be used in the processing process of the mountain-shaped notch, and can accurately position the mountain-shaped notch sample.

As shown in fig. 1, the positioning device 100 includes a base 200, a work rest 300, and a limiter 400.

The base 200 is for connection to the aforementioned processing equipment, and more specifically, the base 200 is connected to a table. The base 200 is connected to a table and provides a supporting force to the work rest 300, and may define the posture of the work rest 300.

As shown in fig. 2 and 3, the base 200 has a first connection portion 201 and a second connection portion 202. The first connection portion 201 and the second connection portion 202 are located substantially at both sides of the base 200. Wherein the first connection portion 201 has a connection face 207. The connection surface 207 is used for being connected with a processing device (workbench) for processing mountain-shaped notch samples, and more specifically, the connection surface 207 is fixed with a pressing plate of the workbench; the second connecting portion 202 has an inclined surface 204. The inclination angle of the inclined surface 204 is 60 degrees as shown in fig. 1, and in other examples, the inclination angle may be 45 degrees, or the inclined surface 204 with a different inclination angle may be designed as required. The inclination angle refers to an angle of the inclined surface 204 with respect to the connection surface 207. Since the inclined surfaces 204 have different angles, the base 200 may be provided with a plurality of sets, for example, two sets, and the inclined surfaces 204 have angles of 45 degrees and 60 degrees, respectively.

As shown in fig. 2, 3 and 4, further, a first back-gouging groove 203 is designed at the bottom end (end of the connecting surface 207) of the base 200, so as to ensure that the base 200 does not interfere with the root of the workbench, and can be fixed and positioned in parallel with the X-axis workbench of the machine tool. The first back-gouging groove 203 is provided such that when the work rest 300 is connected to a processing apparatus, a protruding portion of a work table (processing apparatus) is freely movably disposed in the first back-gouging groove 203 for ensuring the degree of fit and matching of the base 200 and the wire-cut work table to ensure the angle of processing.

Further, the base 200 is further provided with a positioning groove 205, and the positioning groove 205 is located on the inclined surface 204. The detent 205 is used to assemble with a work piece holder 300 (universal work piece frame). An alternative example, the workpiece holder 300 is fastened by two symmetrical fixing bolts, the locating holes 206, which are connected into the locating slots 205.

As shown in fig. 5 and 6, the work piece holder 300 is for accommodating a work piece (mountain notch specimen) and cooperates with the defining piece 400 to controllably define the work piece to have a desired posture. The work rest 300 (universal work frame) is mounted to the base 200.

The work piece carrier 300 is connected to the inclined surface 204. Based on convenience, firmness and stability of connection, the workpiece frame 300 is provided with a positioning key 301 matched with the positioning groove 205, through holes are formed, and the workpiece frame is fixed by bolts, so that the positioning groove 205 and the positioning key 301 of the base 200 with two inclined angles are assembled respectively, and the processing capability of two mountain-shaped gaps of 90 degrees and 120 degrees is realized.

The side of the work piece carrier 300 facing away from the inclined surface 204 has opposed first 302 and second 303 walls. The first wall 302 and the second wall 303 protrude from the sides and define a limit space for accommodating the mountain gap sample. In other words, the spacing space is directed away from the inclined surface 204.

Further, the work rest 300 is provided with a work track groove 304, and the work track groove 304 is located at the bottom end of the work rest 300, more specifically, the work track groove 304 is located at the area of the work rest 300 adjacent to the first wall 302, and the work track groove 304 is configured as a movement path of the processing apparatus for processing mountain notch samples. Specifically, the working track groove 304 is used for receiving the electrode wire (molybdenum wire or tungsten wire), and the electrode wire does not interfere with the working track for preparing the mountain-shaped notch during the processing operation. In this embodiment, the working frame has three working track grooves 304 for meeting the requirements of mountain-shaped notch processing of workpieces with different specifications. Of course, the number of the working track grooves 304 may be other numbers, such as 1, 2, 4, etc. Further, the physical dimension of the working track groove 304 on the universal workpiece frame is larger than the actual dimension of the mountain-shaped notch of the fracture toughness sample, the allowance is reserved for processing and preparing the mountain-shaped notch of the workpiece, and the width of the working track groove 304 is 0.2W (W is the width of the workpiece) and is larger than the width of the mountain-shaped notch by 0.1W.

Further, the top end, i.e., the second wall 303, of the work piece carrier 300 is provided with three locking bolt holes (not shown). The locking bolt holes are provided with internal threads, and correspond to the three working track grooves 304 one by one, so as to lock the workpiece (mountain-shaped notch sample) on the workpiece frame 300 (universal workpiece frame). The limiting piece 400 realizes the locking function of workpieces with different specifications and sizes through three locking bolt holes.

As shown in fig. 6 and 7, further, the second back-gouging groove 306 is designed on the first wall 302 (the root of the lower baffle) of the workpiece rest 300, so that the sharp corner part is not interfered when the workpiece and the workpiece rest 300 are assembled, the fitting performance of the workpiece assembly is improved, and the machining precision and reliability of the mountain-shaped notch sample in the machining process are ensured. The second back-gouging groove 306 is configured such that the root of the mountain gap sample is freely movably disposed within the second back-gouging groove 306 when the mountain gap sample is defined in the workpiece holding space.

Referring again to fig. 1, the limiter 400 is adjustably connected to the workpiece holder 300. The workpiece (mountain notch specimen) is positioned and clamped by adjusting the limiting member 400 together with the base 200.

The limiter 400 includes a positioning member 500 and a clamping member 600. The positioning member 500 has a front section, a middle section, and a rear section connected in sequence. Wherein the positioning member 500 is connected to a side of the workpiece holder 300 and encloses a portion of the limiting space. Specifically, the front and rear sections are connected to the first and second walls 302 and 303, respectively, and the middle section is connected between the first and second walls 302 and 303 of the workpiece holder 300. The clamp 600 is connected to the second wall 303 and is movable relative to the first wall 302.

The clamp 600, the retainer 500, and the first wall 302 together define a workpiece clamping space. When the workpiece is processed, the workpiece is clamped in the workpiece clamping space.

As shown in fig. 8, the positioning member 500 is preferably connected to the workpiece holder 300 by at least two connecting members, and the at least two connecting members are configured to be independently adjusted to change the relative position between the positioning member 500 and the workpiece holder 300, respectively. Alternatively, the number of the connecting pieces is three. More specifically, the connection member is a bolt. The three bolts are equidistantly distributed and pass through the three adjusting holes 501 formed in the positioning piece 500, so that the three adjusting bolts are alternately locked in the process of locking the workpiece, and the feeding force and the feeding stroke are uniform and reliable. Further, three positioning adjusting holes 501 are equidistantly distributed in the positioning module and are used for adjusting and positioning the positioning module in cooperation with adjusting bolts, the adjusting bolts are used for adjusting the positioning module, and the positioning module is used for positioning the position of a workpiece in the workpiece frame.

As shown in fig. 1, the positioning member 500 is mounted to the workpiece holder 300, and the positioning module can be disassembled and dynamically adjusted. The positioning member 500 is provided with an adjusting bolt for ensuring the matching degree and verticality of the positioning module and the universal workpiece frame. The positioning module is mounted on the universal workpiece frame. The clamping member 600 (locking device) is used to engage the workpiece through the universal workpiece frame to accurately position and lock the workpiece to the universal workpiece frame.

In some alternative examples, the root portion (the portion adjacent to the first wall 302) of the contact end of the positioning member 500 (the positioning module) is designed with a third back-gouging groove (not shown), so as to ensure that the pointed portion does not interfere when the workpiece is assembled with the universal workpiece frame (the workpiece frame 300), improve the fitting of the workpiece assembly, and ensure the machining precision and reliability of the mountain-shaped notch sample in the machining process.

As shown in fig. 9, as an example, the clamp 600 has a contact portion 602 and a connection portion 601 provided with threads, which are mated with each other, the contact portion 602 being connected to an end portion of the connection portion 601. The connection 601 is screwed to the second wall 303. The workpiece holding space is collectively defined by the contact portion 602, the positioning member 500, and the first wall 302.

As shown in fig. 10 and 11, the contact 602 is preferably a platen. The contact portion 602 has a contact surface with the mountain-shaped notched sample, and the contact surface has an area larger than that of the connection portion 601. The larger contact surface can improve the stability of clamping and ensure that the workpiece is not easy to shift. Further, the contact portion 602 is rotatably connected to the connection portion 601 with the axial direction of the connection portion 601 as the rotation center line. The rotatable contact 602 allows for rotational adjustment thereof to more closely clamp a workpiece. In the preferred embodiment of the present invention, the clamping member 600 further includes a cylindrical member 603, and the contact portion 602 is connected to the connection portion 601 through the cylindrical member 603 such that the contact portion 602 can freely rotate in the axial direction of the cylindrical member 603.

In other words, the contact portion 602 (locking device) includes two parts of a locking bolt and a pressing plate at the end of the bolt, the locking bolt is connected with the pressing plate by a small bolt with a diameter smaller than that of the connecting hole of the pressing plate, the pressing plate can idle in the top end of the locking bolt and can swing within a certain angle, a certain force is applied to the pressing plate by adjusting the locking bolt, and the pressing plate presses the surface of the workpiece to lock the workpiece. The rotatable and angularly wobbling function of pressure disk has effectively avoided the sample perk that leads to because of the locking bolt is rotatory, more effectual precision of guaranteeing work piece processing.

In other examples, the clamp 600 (locking device) is comprised of a locking bolt and a platen at the end of the bolt, with which a removable platen is assembled to achieve smooth locking of the workpiece to the workpiece holder 300 (universal workpiece frame).

Preferably, the positioning module and the pressure plate are used for positioning and locking the workpiece, and belong to vulnerable parts due to long-time contact and stress with the workpiece, and the detachable structure is adopted in design, so that the workpiece can be replaced after abrasion.

The special design and the effect of pressure disk reduce the stress concentration between pressure disk and the work piece, decompose locking force from the point contact into the face contact, the pressure disk can swing in a flexible way to indirectly transmit the force to the sample through the pressure disk, effectively solve the work piece and stick up the limit problem, and then realize the locking to the work piece.

The using method of the positioning device 100 comprises the following steps:

when the die-cutting die is used, firstly, the blanking blank is used for processing all the overall dimensions of a fracture toughness sample by using linear cutting equipment or a milling machine, then, the corresponding base 200 is selected according to requirements or requirements of relevant standards on the angle of a mountain-shaped notch of the fracture toughness sample (the base 200 is provided with 2 sets, the inclined surface angles of the base 200 are 45 degrees and 60 degrees respectively), at the moment, the base 200 can be well adjusted and matched with a linear cutting X-axis workbench through the root back gouging groove effect of the base 200, then, the base 200 is fixed on the linear cutting workbench through a linear cutting workbench pressing plate, and then, the positioning key 301 on a general workpiece frame is assembled with the positioning groove 205 on the corresponding base 200, and then, the die-cutting die is fixed by using two symmetrically distributed fixing bolts.

And then connecting a positioning module to the universal workpiece frame and abutting against the contact end of the universal workpiece frame, wherein the positioning module is higher than the inclined plane (D2 < D1) of the universal workpiece frame so as to better position the workpiece, then placing the workpiece with the processed external dimension into the universal workpiece frame, selecting a proper working track groove 304 according to the external dimension specification of the workpiece, and after the position of the workpiece is determined, adjusting the positioning module by using an adjusting bolt so as to position the workpiece so as to determine the proper position of the workpiece, wherein the surface of the positioning module for positioning the workpiece is required to ensure enough good smoothness (the roughness is less than 1.6um and is set according to the requirement of the most strict standard on the surface roughness of the fracture toughness sample).

After the position of the workpiece in the general workpiece frame is selected, the pressing plate is indirectly driven to move forwards by rotating the locking bolt, so that the pressing plate is driven to gradually approach the surface of the workpiece, the pressing plate can not rotate once the pressing plate contacts the surface of the workpiece, the pressing plate can be locked by rotating the locking bolt in the pressing plate continuously, the locking effect of the pressing plate on the workpiece is achieved through the conversion of the force, the workpiece is protected, the workpiece is prevented from being scratched in the locking process, 3 locking bolts distributed at equal intervals are arranged in total, the three locking bolts are used for alternately locking in the locking process of the workpiece, so that the feeding force and the feeding stroke are uniform and reliable, the position of a working electrode wire (molybdenum wire or tungsten wire) and a wire frame of a linear cutting device are adjusted after the workpiece is locked, and the linear cutting device can be started to process a mountain notch of a fracture toughness sample, so that the preparation work of the mountain notch fracture toughness workpiece is completed.

A processing method of a mountain-shaped notch sample comprises the following steps:

the workpiece is processed by linear cutting equipment or a milling machine, the workpiece is placed in a general workpiece frame, a positioning module is arranged on one side of the general workpiece frame, the tightness degree of the positioning module and the general workpiece frame is adjusted through an adjusting bolt, the workpiece is abutted against the positioning module and a lower baffle of the workpiece frame, and a corresponding working track groove 304 is selected according to the shape specification and the size of the workpiece, so that the processing precision of the workpiece is ensured.

Based on the above description, the positioning device 100 and the processing system provided by the invention have the following advantages:

(1) Through the development and the use of the mountain-shaped notch sample processing device and the processing method, the mountain-shaped notch of the fracture toughness sample of various metal materials can be accurately positioned and processed, and the problems that the traditional linear cutting can not be used for preparing the mountain-shaped notch slotting with angles, the milling machine is used for processing the cutter in a limited mode, the cost is high, the precision is unreliable and the like are completely solved.

(2) The back gouging grooves are designed at the fixing positions of the two sets of the base 200 with the variable angles and used for guaranteeing the repeated positioning accuracy when the base 200 is fixed with the linear cutting workbench, and the parallelism of the sample and the X direction of the linear cutting workbench after the mounting is guaranteed, so that the angle accuracy of the inclined plane of the universal workpiece frame is guaranteed, the repeated positioning accuracy in batch production is improved, and meanwhile, the guarantee is provided for improving the machining accuracy of the mountain-shaped notch.

(3) The root of the baffle plate under the universal workpiece frame and the root of the contact end of the baffle plate with the positioning module are respectively provided with a back gouging groove for ensuring that the sharp corner parts are not interfered when the workpiece and the universal workpiece frame are assembled, and ensuring the positioning precision of the workpiece assembly, thereby ensuring that the workpiece installation angle and the mountain-shaped notch processing angle are accurate and reliable.

(4) The work piece is installed on general work piece frame, and positioning module is accurate to confirm the work piece and is located work piece frame, and locking device passes through pressure disk and work piece cooperation, locks the work piece in work piece frame, and base 200 is fixed on the online cutting workstation, because the design on this positioning processingequipment structure has realized having the preparation function of angle mountain shape breach, can guarantee the machining precision of mountain shape breach simultaneously, has improved fracture toughness sample finished product qualification rate.

(5) The bottom end surface of the universal workpiece frame is designed to extend downwards by 50mm through the table top of the linear cutting equipment, so that the fixed position of the workpiece extends below the table top of the linear cutting working table, after the design is applied, workpieces of various sizes can be processed under the condition that the height of the linear cutting line frame and the length of the length-adjustable electrode wire are not required to be adjusted, the quality and the precision of the workpieces in the processing process are further ensured (the longer the electrode wire is, the easier the electrode wire vibrates when the electrode wire contacts the workpiece to work, the precision and the quality of the processing surface can be reduced, the lower wire frame is fixed, and the upper wire frame can be adjusted according to the heights of the workpieces or the positioning and locking tools to meet the height requirements of different workpieces).

(6) For two fracture toughness mountain-shaped notch angles (90 degrees and 120 degrees) required by national standard GB/T4161-2007 and American standard ASTM E399-2012, the fracture toughness mountain-shaped notch angle can be realized by replacing two sets of bases 200 (45 degrees and 60 degrees respectively) with different angles, the universal workpiece frame and the bases 200 are assembled and fixed by adopting keys and grooves, and the fracture toughness sample mountain-shaped notch angle precision is ensured (after one surface of a workpiece is walked, the workpiece is turned over to process the other surface, and the processing requirements of the 90-degree notch and the 120-degree notch can be completed by two times of processing).

(7) The locking device adopts special design, the locking bolt is connected with the pressure plate by adopting a small bolt with the diameter smaller than the diameter of the pressure plate connecting hole, the pressure plate can idle in the top end of the locking bolt, and can swing in a certain angle to apply a certain force to the pressure plate by adjusting the locking bolt, the pressure plate breaks down the force to act on the surface of the sample, so that the sample is locked, on one hand, the tilting of the sample caused by the rotation of the locking bolt is effectively avoided, and meanwhile, the pressure plate is in surface contact with the workpiece, so that the influence of stress concentration can be reduced, and the processing precision of the sample is more effectively ensured. Meanwhile, the positioning module and the pressure plate can be detached, abrasion is caused in the long-term use process of the device, the positioning module and the pressure plate can be replaced, and the service life of the mountain-shaped notch sample processing device is prolonged.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A positioning device for positioning a mountain gap sample for processing the mountain gap, the positioning device comprising:

a base having a first connection portion having a connection face configured to be connected with a processing apparatus that processes the mountain-shaped notch sample and a second connection portion having an inclined face;

a workpiece holder connected to the inclined surface, the workpiece holder having opposed first and second walls defining a spacing space for receiving the chevron notch sample, the spacing space facing away from the inclined surface;

a defining member including a positioning member and a clamping member, the positioning member being connected to the first wall and the second wall, respectively, and closing a portion of the spacing space, the clamping member being connected to the second wall and being movable relative to the first wall, the clamping member, the positioning member and the first wall together defining a workpiece clamping space;

the base is also provided with a positioning slot, the positioning slot is positioned on the inclined surface, and the positioning slot is configured to be assembled with the workpiece frame.

2. The positioning device of claim 1, wherein the base has a connection surface in contact with the processing equipment, and the inclined surface is inclined at 45 ° or 60 ° with respect to the connection surface.

3. The positioning device as set forth in claim 1 wherein said clamping member has a mating contact portion and a threaded connection portion, said connection portion being threadably connected to said second wall, said contact portion being connected to an end of said connection portion, said workpiece holding space being defined collectively by said contact portion, said positioning member and said first wall.

4. A positioning device as set forth in claim 3 wherein said contact portion has a contact surface for contacting said mountain gap sample, said contact surface having an area greater than an area of said connecting portion.

5. The positioning device according to claim 3 or 4, wherein the contact portion is rotatably connected to the connecting portion with an axial direction of the connecting portion as a rotation center line.

6. The positioning device of claim 5 wherein said clamping member further comprises a cylindrical member, said contact portion being connected to said connecting portion by said cylindrical member such that said contact portion is free to swivel in an axial direction of said cylindrical member.

7. The positioning device of claim 1 wherein the positioning member is connected to the workpiece holder by at least two connecting members, and the at least two connecting members are configured to be independently adjusted to change the relative position between the positioning member and the workpiece holder, respectively.

8. The positioning device of claim 1 or 7, wherein the work rest is provided with a plurality of work track grooves configured as a movement path for the processing device to process the mountain gap sample.

9. The positioning device of claim 1, wherein the workpiece holder has a second back-gouging groove within the spacing space, the second back-gouging groove configured such that a root of the mountain gap sample is freely movably disposed within the second back-gouging groove when the mountain gap sample is defined in the workpiece clamping space;

the base is provided with a first back-gouging groove configured such that a protrusion of the processing apparatus is freely movably disposed within the first back-gouging groove when the work holder is connected to the processing apparatus.

10. A processing system comprising the processing apparatus, a positioning device according to any one of claims 1-9.