CNC machining part fixing jig and manufacturing method thereof

Abstract

The present invention provides a CNC machined part fixing fixture and a manufacturing method thereof, wherein the fixture comprises a base plate, a pad plate and a positioning plate, a fourth negative pressure through hole is provided on the base plate, a third negative pressure through hole, a first negative pressure cavity, a first vacuum suction pipe and a plurality of second negative pressure through holes are provided on the pad plate, a first adsorption through slot, a first negative pressure through hole and a positioning boss are provided on the positioning plate, the first vacuum suction pipe and the fourth negative pressure through hole can both be connected to a vacuum negative pressure source, the vacuum negative pressure source sequentially adsorbs the positioning plate on the pad plate through the first vacuum suction pipe, the first negative pressure cavity and a plurality of second negative pressure through holes, and the vacuum negative pressure source sequentially adsorbs the CNC machined part on the positioning plate through the fourth negative pressure through hole, the third negative pressure through hole, the first adsorption through slot and the first negative pressure through hole. The present invention can not only realize the recycling and rapid switching of the fixed fixture, reduce the fixture manufacturing cost, and improve the product processing efficiency, but also realize accurate positioning and switch processing of different varieties of products on different multi-axis machines.

Description

Technical Field

[0001] The invention belongs to the technical field of clamps for CNC equipment, and in particular relates to a CNC machined part fixing fixture and a manufacturing method thereof. Background Art

[0002] As people's aesthetics improve, the appearance and visual effects of electronic products tend to be more diverse and high-quality. At present, because the texture, visual effects and feel of glass are better than those of plastic materials, more and more glass materials are used for display covers and back covers of electronic products, especially the demand for 2.5D and 3D structured glass covers is increasing.

[0003] Due to the diversification and miniaturization of the glass cover product structure, in order to meet customer needs, it is necessary to constantly switch product varieties during the production process. However, the traditional CNC processing method of glass cover plates is that each time a product is processed, the fixed fixture for positioning the glass cover plate needs to be replaced, and the fixed fixture that is compatible with the glass cover plate needs to be remade, resulting in large consumption of semi-finished fixtures, high production costs, time-consuming and labor-intensive disassembly and assembly, and low product processing efficiency. In addition, the CNC machines currently used for processing glass cover plates include single-axis machines, dual-axis machines, and multi-axis machines. Among them, the distance between the spindles on dual-axis machines and multi-axis machines is not uniformly standardized, resulting in the inability to accurately position multiple fixtures when leveling and centering, resulting in fixed fixtures that can only be used on fixed CNC machines and fixed axes. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present invention provides a CNC machined part fixing fixture and a manufacturing method thereof.

[0005] In the first aspect, the invention provides a CNC workpiece fixing fixture, which is applied to a CNC machine tool; the fixing fixture comprises:

[0006] A positioning plate for receiving a CNC machined part; the positioning plate is provided with a first adsorption groove, at least one first negative pressure through hole and at least one positioning boss, the first negative pressure through hole is arranged in a one-to-one correspondence with the positioning boss, and the first negative pressure through hole passes through the positioning plate;

[0007] A pad, used to hold up the positioning plate, and the positioning plate is positioned on the pad via positioning pins; a first negative pressure chamber, a first vacuum suction pipe, a plurality of second negative pressure through holes and a third negative pressure through hole are provided on the pad, and the first vacuum suction pipe and the plurality of second negative pressure through holes are both connected to the first negative pressure chamber;

[0008] A bottom plate is fixedly mounted on the CNC processing platform and is used to hold up and fix the pad; a fourth negative pressure through hole is provided on the bottom plate, and the fourth negative pressure through hole is connected to the third negative pressure through hole;

[0009] Among them, the first vacuum suction pipe and the fourth negative pressure through hole are both connected to the vacuum negative pressure source, and the positioning plate is adsorbed on the pad through the first vacuum suction pipe, the first negative pressure chamber and multiple second negative pressure through holes in a negative pressure state; at the same time, the CNC machined part is adsorbed on the positioning plate through the fourth negative pressure through hole, the third negative pressure through hole, the first adsorption groove and the first negative pressure through hole in a negative pressure state.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the positioning plate and the CNC machined parts are fixed respectively by utilizing independent vacuum negative pressure suction, that is, a first vacuum suction pipe, a first negative pressure cavity and a plurality of second negative pressure through holes which can be sequentially connected to the vacuum negative pressure source are provided on the pad plate, so as to form a first vacuum negative pressure suction channel which can adsorb and fix the positioning plate on the pad plate, and a fourth negative pressure through hole which can be connected to the vacuum negative pressure source is provided on the bottom plate, a third negative pressure through hole which is connected to the fourth negative pressure through hole is provided on the pad plate, and a first adsorption through groove and a first negative pressure through hole which are connected to the third negative pressure through hole are provided on the positioning plate, so as to form a second vacuum negative pressure suction channel which can adsorb the CNC machined parts on the bottom plate, the pad plate and the positioning plate, which can not only realize the recycling and rapid switching of the CNC machined parts fixing jigs, reduce the jig manufacturing cost and improve the product processing efficiency, but also realize precise positioning and switch the processing of different types of products on different dual-axis machines and multi-axis machines.

[0011] Preferably, the first adsorption grooves are arranged in a staggered manner, and each of the first adsorption grooves is arranged between a plurality of the second negative pressure holes.

[0012] Preferably, a first sealing ring and multiple second sealing rings are provided on the top of the pad, the second sealing ring is provided at the outer edge of the second negative pressure through hole, the first sealing ring is provided at the outer edge of the area occupied by the multiple second negative pressure through holes, and the first sealing ring and the multiple second sealing rings are used to seal the cavity formed by the overlapping of the pad and the positioning plate.

[0013] Preferably, the positioning plate is provided with a positioning boss and the first negative pressure through hole, the top surface of the positioning boss is provided with a second adsorption through groove, and the first negative pressure through hole is connected to the second adsorption through groove and the first adsorption through groove.

[0014] Preferably, the positioning plate is provided with a plurality of the positioning bosses and a plurality of the first negative pressure through holes, and the positioning bosses are arranged in one-to-one correspondence with the first negative pressure through holes; the positioning boss is provided with an adsorption cavity, and the first negative pressure through hole is connected to the adsorption cavity and the first adsorption through groove.

[0015] Preferably, the second negative pressure through hole comprises a plurality of adsorption holes arranged in an array.

[0016] Preferably, a second negative pressure chamber is excavated on the top of the bottom plate, and the second negative pressure chamber is adapted to be relatively arranged with the first negative pressure chamber.

[0017] Preferably, a third sealing ring and a fourth sealing ring are provided on the top of the bottom plate, the third sealing ring is used to seal the joint between the third negative pressure through hole and the fourth negative pressure through hole, and the fourth sealing ring is used to seal the cavity formed by the overlapping of the pad and the bottom plate.

[0018] Preferably, the positioning pin includes a first positioning pin and a second positioning pin, the outer diameter of the first positioning pin is larger than the outer diameter of the second positioning pin, and the positioning plate is provided with a first positioning hole and a second positioning hole respectively matched with the first positioning pin and the second positioning pin.

[0019] In a second aspect, the invention provides a method for manufacturing a CNC machined part fixing fixture, which is used to manufacture the CNC machined part fixing fixture of the first aspect; the manufacturing method comprises the following steps:

[0020] S1. Level the processed bottom plate and fix it on the CNC processing platform; wherein the bottom plate is provided with a plurality of threaded holes, a plurality of second countersunk holes, a second negative pressure cavity, a fourth negative pressure through hole, a second vacuum suction pipe, a third sealing ring groove and a fourth sealing ring groove; the second vacuum suction pipe is connected to the fourth negative pressure through hole, the third sealing ring groove is arranged at the outer edge of the fourth negative pressure through hole, and the fourth sealing ring groove is arranged at the outer edge of the second negative pressure cavity;

[0021] S2, centering the bottom plate, setting and saving the origin;

[0022] S3. Install the third sealing ring and the fourth sealing ring in the third sealing ring groove and the fourth sealing ring groove respectively, and fix the semi-finished pad plate on the top surface of the bottom plate; wherein, the semi-finished pad plate is provided with a plurality of first countersunk holes, a plurality of second negative pressure through holes, a third negative pressure through hole, a first negative pressure cavity, a first sealing ring groove, a second sealing ring groove and a first vacuum suction pipe; the first negative pressure cavity is relatively adapted to the second negative pressure cavity, the third negative pressure through hole is connected to the fourth negative pressure through hole, the first vacuum suction pipe and the plurality of the second negative pressure through holes are both connected to the first negative pressure cavity, the first countersunk hole is relatively adapted to the threaded hole, the second sealing ring groove is arranged at the outer edge of the second negative pressure through hole, the first sealing ring groove is arranged at the outer edge of the area occupied by the plurality of the second negative pressure through holes, and the second negative pressure through hole includes a plurality of adsorption holes arranged in an array;

[0023] S4, taking the origin set in step S2 as a reference, processing a first positioning pin hole and a second positioning pin hole on the top surface of the backing plate semi-finished product to form the backing plate, and installing the first positioning pin, the second positioning pin, the first sealing ring and the second sealing ring in the first positioning pin hole, the second positioning pin hole, the first sealing ring groove and the second sealing ring groove respectively;

[0024] S5. Install the semi-finished positioning plate on the top surface of the pad through the first positioning pin and the second positioning pin, connect the first vacuum suction pipe to the vacuum negative pressure source, and adsorb the semi-finished positioning plate on the pad through the first vacuum suction pipe, the first negative pressure chamber and the plurality of second negative pressure through holes in a negative pressure state; wherein the semi-finished positioning plate is provided with a first positioning hole, a second positioning hole and a first adsorption through groove, the first positioning hole and the second positioning hole are respectively matched with the first positioning pin and the second positioning pin, the first adsorption through groove is staggered and arranged between the plurality of second negative pressure through holes, and the first adsorption through groove is connected with the third negative pressure through hole;

[0025] S6. Taking the origin set in step S2 as a reference, at least one first negative pressure through hole and at least one positioning boss are processed on the semi-finished positioning plate to form the positioning plate, and the positioning boss is compatible with the CNC machined part; wherein, the first negative pressure through hole passes through the positioning plate, and the first negative pressure through hole is connected to the first adsorption groove.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: by producing a first channel for fixing the positioning plate and a second channel for adsorbing the CNC workpiece using independent vacuum negative pressure suction, not only can the recycling and rapid switching of the CNC workpiece fixing jig be realized, thereby reducing the jig manufacturing cost and improving product processing efficiency, but also precise positioning can be achieved and different types of products can be switched on different dual-axis machines and multi-axis machines for processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 An exploded schematic diagram of a CNC machined part fixing fixture provided in Embodiment 1 of the present invention;

[0029] Figure 2 A cross-sectional view of a CNC machined part fixing fixture provided in Embodiment 1 of the present invention;

[0030] Figure 3 Another cross-sectional view of the CNC machined part fixing fixture provided in the first embodiment of the present invention;

[0031] Figure 4 A top view of a positioning plate in a CNC machined part fixing fixture provided in Embodiment 1 of the present invention;

[0032] Figure 5 A bottom view of a positioning plate in a CNC machined part fixing fixture provided in the first embodiment of the present invention;

[0033] Figure 6 A top view of a backing plate in a CNC workpiece fixing fixture provided in Example 1 of the present invention;

[0034] Figure 7 A bottom view of a backing plate in a CNC workpiece fixing fixture provided in the first embodiment of the present invention;

[0035] Figure 8 A schematic diagram of the structure of a bottom plate in a CNC machined part fixing fixture provided in Embodiment 1 of the present invention;

[0036] Fig. 9 This is a schematic diagram of the structure of a positioning plate in a CNC workpiece fixing fixture provided in Example 2 of the present invention.

[0037] Description of reference numerals:

[0038] 10-CNC machined parts;

[0039] 20-positioning plate, 201-first negative pressure through hole, 202-first positioning hole, 203-second positioning hole, 204-first adsorption through groove, 21-positioning boss, 211-second adsorption through groove, 212-adsorption chamber;

[0040] 30- pad, 301- first countersunk hole, 302- second negative pressure through hole, 303- third negative pressure through hole, 304- first negative pressure chamber, 31- first positioning pin, 32- second positioning pin, 33- first sealing ring, 34- second sealing ring, 35- first vacuum suction pipe;

[0041] 40 - bottom plate, 401 - threaded hole, 402 - second countersunk hole, 403 - second negative pressure chamber, 404 - fourth negative pressure through hole, 41 - second vacuum suction pipe, 42 - third sealing ring, 43 - fourth sealing ring. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0043] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0046] On the one hand, in order to solve the technical problems in the prior art and achieve the purpose of improving product processing efficiency and reducing the cost of fixture production, the present invention provides a CNC machining part fixing fixture, which is specifically described as follows.

[0047] Embodiment 1:

[0048] like Figure 1 As shown, it is a schematic diagram of the structure of the CNC machined part fixing fixture in this embodiment, and the CNC machined part fixing fixture includes a positioning plate 20, a pad 30 and a bottom plate 40. Specifically, the bottom plate 40 is fixedly mounted on the CNC machining platform by 4 bolts, the pad 30 is fixedly mounted on the top surface of the bottom plate 40 by 6 bolts, and the positioning plate 20 is fixedly adsorbed on the top surface of the pad 30 by 2 positioning pins and vacuum negative pressure suction.

[0049] The CNC workpiece fixing fixture provided in this embodiment can fix the adsorption positioning plate 20 and the CNC workpiece 10 respectively by using two independent vacuum negative pressure suction channels, wherein the CNC workpiece 10 is a glass cover plate. This can not only realize the recycling and rapid switching of the CNC workpiece fixing fixture, reduce the fixture manufacturing cost, and improve the product processing efficiency, but also realize accurate positioning and realize the switching of processing different types of products on different dual-axis machines and multi-axis machines, and enhance the versatility.

[0050] like Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, a concave second negative pressure cavity 403 is provided in the middle of the top surface of the bottom plate 40, a fourth sealing ring groove (not marked in the figure) is provided on the top surface of the bottom plate 40 and at the outer edge of the second negative pressure cavity 403, and a fourth sealing ring 43 is installed in the fourth sealing ring groove; 6 threaded holes 401 and 4 second countersunk holes 402 are provided on the periphery of the bottom plate 40 and at the outer edge of the second negative pressure cavity 403, and the bottom plate 40 can be fixedly installed on the CNC processing platform through the second countersunk holes 402; an L-shaped fourth negative pressure through hole 404 is provided on the bottom plate 40, and the fourth negative pressure through hole 404 has a One end is arranged at the center of the base plate 40 and its top surface is consistent with the top surface of the base plate 40, and the other end of the fourth negative pressure through hole 404 is arranged on one side of the base plate 40, and a second vacuum suction pipe 41 is fixedly installed on this side of the base plate 40, and the second vacuum suction pipe 41 is threadedly connected to the fourth negative pressure through hole 404, and the second vacuum suction pipe 41 can be connected to the vacuum negative pressure source on the CNC processing platform; a third sealing ring groove (not marked in the figure) is arranged on the outer edge of one end of the fourth negative pressure through hole 404 close to the second negative pressure chamber 403, and a third sealing ring 42 is installed in the third sealing ring groove.

[0051] Secondly, a concave first negative pressure chamber 304 is arranged in the middle of the bottom surface of the pad 30, and the circumferential size of the first negative pressure chamber 304 is consistent with the circumferential size of the second negative pressure chamber 403 on the bottom plate 40, that is, the first negative pressure chamber 304 and the second negative pressure chamber 403 are relatively adapted to each other, so that the first negative pressure chamber 304 completely covers the second negative pressure chamber 403; six first countersunk holes 301 are arranged on the periphery of the pad 30 and on the outer edge of the first negative pressure chamber 304, and the six first countersunk holes 301 are adapted one by one to the six threaded holes 401 on the bottom plate 40, so that the pad 30 can be fixedly installed on the top surface of the bottom plate 40 by bolts, and the fourth sealing ring 43 on the bottom plate 40 is used to realize the sealing between the second negative pressure chamber 403 on the bottom plate 40 and the first negative pressure chamber 304 on the pad 30.

[0052] At the same time, a third negative pressure through hole 303 is arranged at the center of the pad 30 and its bottom surface is consistent with the bottom surface of the pad 30. When the pad 30 is fixedly installed on the top surface of the base plate 40 by bolts, the third negative pressure through hole 303 can be connected with the fourth negative pressure through hole 404 on the base plate 40, and the third sealing ring 42 on the base plate 40 is used to realize the sealing of the third negative pressure through hole 303 on the pad 30 and the fourth negative pressure through hole 404 on the base plate 40, that is, the third negative pressure through hole 303 is connected with the fourth negative pressure through hole 404 but not with the first negative pressure chamber 304 and the second negative pressure chamber 403; a first vacuum suction pipe 35 is fixedly installed on one side of the pad 30, and the first vacuum suction pipe 35 can be connected with the first negative pressure chamber 304 and can be connected to the vacuum negative pressure source on the CNC machining platform.

[0053] Furthermore, a plurality of second negative pressure through holes 302 are provided in the middle of the top surface of the backing plate 30, and the plurality of second negative pressure through holes 302 are arranged in an array and are all connected to the first negative pressure chamber 304; a second sealing ring groove (not marked in the figure) is provided on the top surface of the backing plate 30 and on the outer edge of each second negative pressure through hole 302, and a second sealing ring 34 is installed in the second sealing ring groove; a first sealing ring groove (not marked in the figure) is provided on the top surface of the backing plate 30 and on the outer edge of all the second negative pressure through holes 302, and a first sealing ring 33 is installed in the first sealing ring groove , the first sealing ring 33 and the plurality of second sealing rings 34 can be used to achieve the separation between the plurality of second negative pressure through holes 302; a first positioning pin hole and a second positioning pin hole (not marked in the figure) are provided on the top surface of the pad 30 and on the outer edges of all the second negative pressure through holes 302, and the outer diameter of the first positioning pin hole is larger than the outer diameter of the second positioning pin hole, and a first positioning pin 31 and a second positioning pin 32 are fixedly installed in the first positioning pin hole and the second positioning pin hole, respectively, to facilitate the identification of the direction of the pad 30 and to realize the positioning of the positioning plate 20 on the X-axis and the Y-axis.

[0054] In other embodiments, in order to stably adsorb and support the positioning plate 20 and ensure the positioning accuracy of the positioning plate 20 on the Z axis, each second negative pressure through hole 302 may include a plurality of adsorption holes arranged in an array (not marked in the figure), that is, the adsorption hole has a smaller aperture.

[0055] like Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, a first adsorption groove 204 is arranged in the middle of the bottom surface of the positioning plate 20, and the first adsorption groove 204 is staggered and located between multiple second negative pressure holes 302, that is, the first adsorption groove 204 is not connected to the second negative pressure hole 302; a first negative pressure hole 201 is arranged in the center of the positioning plate 20, and the first negative pressure hole 201 is connected to the first adsorption groove 204, and when the positioning plate 20 is fixedly adsorbed on the top surface of the pad 30, the first negative pressure hole 201 can be connected with the third negative pressure hole 303 on the pad 30, and connected with the first adsorption groove 204; a first positioning hole 202 and a second positioning hole 203 are arranged around the bottom surface of the positioning plate 20, and the first positioning hole 202 and the second positioning hole 203 are respectively adapted to the first positioning pin 31 and the second positioning pin 32 on the pad 30, so as to utilize the first positioning pin 31 and the second positioning pin 32 to install the positioning plate 20 on the top surface of the pad 30.

[0056] In this embodiment, when the vacuum negative pressure source is connected to the first vacuum suction pipe 35 and suctions air, the vacuum negative pressure source can fix the positioning plate 20 on the top surface of the pad 30 through the first vacuum suction pipe 35, the first negative pressure chamber 304 and the multiple second negative pressure through holes 302 in sequence to achieve the positioning of the positioning plate 20 on the Z axis; at the same time, the first sealing ring 33 and the multiple second sealing rings 34 installed on the pad 30 can achieve sealing between the multiple second negative pressure through holes 302, so that the multiple second negative pressure through holes 302 are not connected to the first adsorption groove 204 and the first negative pressure through hole 201.

[0057] Finally, a positioning boss 21 adapted to the CNC workpiece 10 to be processed is provided on the top of the positioning plate 20, and a second adsorption groove 211 is provided on the top surface of the positioning boss 21. The second adsorption groove 211 is connected to the first negative pressure through hole 201, that is, the first adsorption groove 204 and the second adsorption groove 211 are both connected to the first negative pressure through hole 201.

[0058] In this embodiment, when the CNC machined part 10 is placed on the top surface of the positioning boss 21, and when the vacuum negative pressure source is connected to the second vacuum suction pipe 41 and suction is performed, the vacuum negative pressure source can sequentially adsorb and fix the CNC machined part 10 on the top surface of the positioning plate 20 through the second vacuum suction pipe 41, the fourth negative pressure through hole 404, the third negative pressure through hole 303, the first negative pressure through hole 201 and the second adsorption groove 211 to facilitate CNC machining.

[0059] Embodiment 2:

[0060] like Fig. 9As shown, it is a schematic diagram of the structure of the positioning plate 20 in the CNC processing part fixing fixture in this embodiment. The structure of the CNC processing part fixing fixture in this embodiment is substantially the same as that of the CNC processing part fixing fixture in Example 1, except that the structure of the positioning plate 20 is adapted according to the structure of the CNC processing part 10 to be processed.

[0061] Specifically, when the size of the CNC machined part 10 is relatively small and CNC multi-piece processing is required, a plurality of positioning bosses 21 that are compatible with the CNC machined part 10 to be processed are arranged on the top of the positioning plate 20 that is compatible with the CNC machined part 10, and an adsorption cavity 212 is arranged on the top surface of the positioning boss 21; at the same time, a first adsorption groove 204 is also arranged in the middle of the bottom surface of the positioning plate 20, and the first adsorption grooves 204 are staggered and located between the plurality of second negative pressure through holes 302, that is, the first adsorption grooves 204 are not connected to the second negative pressure through holes 302; a first negative pressure through hole 201 is arranged on the positioning plate 20 and at the center of the corresponding positioning boss 21, and the first negative pressure through hole 201 is connected to the adsorption cavity 212 and the first adsorption groove 204.

[0062] In this embodiment, when the CNC machined part 10 is placed on the top surface of the positioning boss 21, and when the vacuum negative pressure source is connected to the second vacuum suction pipe 41 and suction is performed, the vacuum negative pressure source can sequentially pass through the second vacuum suction pipe 41, the fourth negative pressure through hole 404, the third negative pressure through hole 303, the first adsorption groove 204, the first negative pressure through hole 201 and the adsorption chamber 212 to adsorb and fix the CNC machined part 10 on the top surface of the positioning plate 20 to facilitate CNC processing.

[0063] In actual application, when the model of the CNC machined part 10 changes, only the positioning plate 20 needs to be replaced, without replacing the base plate 40 and the pad 30. This realizes the recycling and rapid switching of CNC machining jigs, reduces the jig manufacturing cost, and improves product processing efficiency.

[0064] On the other hand, the present invention also provides a method for manufacturing the CNC machined workpiece fixing fixture of the above embodiment, which specifically comprises the following steps:

[0065] S1. Level the processed bottom plate 40 and fix it on the CNC processing platform by bolts.

[0066] Among them, a concave second negative pressure cavity 403 is arranged in the middle of the top surface of the processed bottom plate 40, a fourth sealing ring groove is arranged on the top surface of the bottom plate 40 and at the outer edge of the second negative pressure cavity 403, 6 threaded holes 401 and 4 second countersunk holes 402 are arranged on the periphery of the bottom plate 40 and at the outer edge of the second negative pressure cavity 403, an L-shaped fourth negative pressure through hole 404 is arranged on the bottom plate 40, one end of the fourth negative pressure through hole 404 is arranged at the center of the bottom plate 40 and its top surface is consistent with the top surface of the bottom plate 40, and the other end of the fourth negative pressure through hole 404 is arranged on one side of the bottom plate 40, and a second vacuum suction pipe 41 is fixedly installed on the side of the bottom plate 40, and the second vacuum suction pipe 41 is threadedly connected to the fourth negative pressure through hole 404, and a third sealing ring groove is arranged on the outer edge of one end of the fourth negative pressure through hole 404 close to the second negative pressure cavity 403.

[0067] It should be noted that, for a dual-axis machine or a multi-axis machine, after confirming the distance between the spindles on the dual-axis machine or the multi-axis machine, two base plates 40 can be installed on the dual-axis machine, or multiple base plates 40 can be installed on the multi-axis machine, that is, one spindle on the dual-axis machine or the multi-axis machine corresponds to one base plate 40. The following is an explanation of the fixture corresponding to one spindle.

[0068] S2. Center the base plate 40 fixedly mounted on the CNC processing platform and corresponding to a certain spindle, set the origin of the base plate 40 and save the origin.

[0069] S3, installing the third sealing ring 42 and the fourth sealing ring 43 in the third sealing ring groove and the fourth sealing ring groove respectively, and fixing the semi-finished backing plate 30 on the top surface of the bottom plate 40 by bolts.

[0070] Among them, a concave first negative pressure cavity 304 is arranged in the middle of the bottom surface of the semi-finished pad, and the circumferential size of the first negative pressure cavity 304 is consistent with the circumferential size of the second negative pressure cavity 403 on the bottom plate 40, and 6 first countersunk holes 301 are arranged on the periphery of the pad 30 and on the outer edge of the first negative pressure cavity 304, and the 6 first countersunk holes 301 are adapted to the 6 threaded holes 401 on the bottom plate 40 in a one-to-one correspondence, so that the pad 30 can be fixedly installed on the top surface of the bottom plate 40 by bolts, and the fourth sealing ring 43 on the bottom plate 40 is used to achieve the sealing between the second negative pressure cavity 403 on the bottom plate 40 and the first negative pressure cavity 304 on the semi-finished pad; at the same time, a third negative pressure through hole 303 is arranged in the center of the semi-finished pad and its bottom surface is consistent with the bottom surface of the pad 30. When the semi-finished pad is fixedly installed on the top surface of the bottom plate 40 by bolts, the third negative pressure through hole 303 is arranged on the bottom surface of the pad When on the top surface of the bottom plate 40, the third negative pressure through hole 303 can be connected with the fourth negative pressure through hole 404 on the bottom plate 40, and the third sealing ring 42 on the bottom plate 40 is used to realize the sealing of the third negative pressure through hole 303 on the semi-finished pad plate and the fourth negative pressure through hole 404 on the bottom plate 40; a first vacuum suction pipe 35 is fixedly installed on one side of the semi-finished pad plate, and the first vacuum suction pipe 35 can be connected with the first negative pressure cavity 304; a plurality of second negative pressure through holes 302 are arranged in the middle of the top surface of the semi-finished pad plate, and the plurality of second negative pressure through holes 302 are arranged in an array and are all connected with the first negative pressure cavity 304, a second sealing ring groove is arranged on the top surface of the semi-finished pad plate and at the outer edge of each second negative pressure through hole 302, and a first sealing ring groove is arranged on the top surface of the semi-finished pad plate and at the outer edges of all the second negative pressure through holes 302.

[0071] In other embodiments, in order to stably adsorb and support the positioning plate 20 and ensure the positioning accuracy of the positioning plate 20 on the Z axis, each second negative pressure through hole 302 may include a plurality of adsorption holes arranged in an array (not marked in the figure), that is, the adsorption hole has a smaller aperture.

[0072] S4. Taking the origin set in step S2 as a reference, the first positioning pin hole and the second positioning pin hole are processed on the top surface of the semi-finished pad and on the outer edges of all the second negative pressure through holes 302 to form the pad 30, and the outer diameter of the first positioning pin hole is larger than the outer diameter of the second positioning pin hole. Then, the first positioning pin 31 and the second positioning pin 32 are respectively installed in the first positioning pin hole and the second positioning pin hole to facilitate the identification of the direction of the pad 30 and realize the positioning of the positioning plate 20 on the X-axis and the Y-axis. Then, the first sealing ring 33 and the multiple second sealing rings 34 are respectively installed in the first sealing ring groove and the second sealing ring groove to realize the separation between the multiple second negative pressure through holes 302.

[0073] S5. Install the positioning plate semi-finished product on the top surface of the pad 30 through the first positioning pin 31 and the second positioning pin 32, and connect the first vacuum suction pipe 35 to the vacuum negative pressure source, so that the vacuum negative pressure source fixes and adsorbs the positioning plate semi-finished product on the top surface of the pad 30 through the first vacuum suction pipe 35, the first negative pressure chamber 304 and the multiple second negative pressure through holes 302 in sequence, so as to realize the positioning of the positioning plate semi-finished product on the Z axis; at the same time, the first sealing ring 33 and the multiple second sealing rings 34 installed on the pad 30 can realize the sealing between the multiple second negative pressure through holes 302, so that the multiple second negative pressure through holes 302 are not connected with the first adsorption groove 204 and the first negative pressure through hole 201.

[0074] Among them, a first adsorption groove 204 is pre-processed in the middle of the bottom surface of the semi-finished product of the positioning plate. The first adsorption groove 204 is criss-crossed and is located between multiple second negative pressure holes 302, and can be connected with the third negative pressure hole 303. The first positioning hole 202 and the second positioning hole 203 are arranged around the bottom surface of the semi-finished product of the positioning plate to form the positioning plate 20. The first positioning hole 202 and the second positioning hole 203 are respectively matched with the first positioning pin 31 and the second positioning pin 32 on the pad 30, so that the positioning plate 20 can be installed on the top surface of the pad 30 by using the first positioning pin 31 and the second positioning pin 32.

[0075] S6. Based on the origin set in step S2, at least one first negative pressure through hole 201 and at least one positioning boss 21 are processed on the positioning plate semi-finished product to form the positioning plate 20, wherein the positioning boss 21 is adapted to the CNC machined part 10.

[0076] Specifically, when the size of the CNC machined part 10 is large and suitable for CNC single-piece processing, such as when applied to Figure 1 When the CNC machined part 10 is positioned, after the semi-finished product of the positioning plate is fixedly adsorbed on the pad 30 by a vacuum negative pressure source, a positioning boss 21 adapted to the CNC machined part 10 is processed on the top of the semi-finished product of the positioning plate, and a second adsorption groove 211 is processed on the top surface of the positioning boss 21; at the same time, a first negative pressure through hole 201 is processed in the center of the semi-finished product of the positioning plate to form the positioning plate 20, and the first negative pressure through hole 201 is connected with the first adsorption through hole 204 and the second adsorption through hole 211, and when the positioning plate 20 is fixedly adsorbed on the top surface of the pad 30, the first negative pressure through hole 201 can be connected with the third negative pressure through hole 303 on the pad 30. At this time, when the CNC machined part 10 is placed on the top surface of the positioning boss 21, and when the vacuum negative pressure source is connected to the second vacuum suction pipe 41 and suction is performed, the vacuum negative pressure source can sequentially pass through the second vacuum suction pipe 41, the fourth negative pressure through hole 404, the third negative pressure through hole 303, the first negative pressure through hole 201 and the second adsorption groove 211 to adsorb and fix the CNC machined part 10 on the top surface of the positioning plate 20.

[0077] When the size of the CNC machined workpiece 10 is small and suitable for CNC multi-piece machining, such as when applied to Fig. 9 When the CNC machined part 10 is being machined, after the semi-finished product of the positioning plate is fixedly adsorbed on the pad 30 by a vacuum negative pressure source, a plurality of positioning bosses 21 compatible with the CNC machined part 10 to be machined are processed on the top of the semi-finished product of the positioning plate, and an adsorption cavity 212 is processed on the top surface of the positioning boss 21; at the same time, a first negative pressure through hole 201 is processed on the positioning plate 20 and at the center of the corresponding positioning boss 21, and the first negative pressure through hole 201 is connected with the adsorption cavity 212 and the first adsorption through groove 204, and when the positioning plate 20 is fixedly adsorbed on the top surface of the pad 30, the first negative pressure through hole 201 and the first adsorption through groove 204 can be connected with the third negative pressure through hole 303 on the pad 30. At this time, when the CNC machined part 10 is placed on the top surface of the positioning boss 21, and when the vacuum negative pressure source is connected to the second vacuum suction pipe 41 and suction is performed, the vacuum negative pressure source can sequentially pass through the second vacuum suction pipe 41, the fourth negative pressure through hole 404, the third negative pressure through hole 303, the first adsorption groove 204, the first negative pressure through hole 201 and the adsorption chamber 212 to adsorb and fix the CNC machined part 10 on the top surface of the positioning plate 20.

[0078] Finally, when the CNC workpiece fixing fixture is processed, the CNC workpiece 10 can be CNC processed based on the origin set in step S2. It should be noted that when it is necessary to switch to different types of products on the same spindle of the same machine, it is only necessary to replace the positioning plate 20 without replacing the base plate 40 and the pad 30; at the same time, different types of CNC workpieces 10 can also be CNC processed on a dual-axis machine or a multi-axis machine at the same time. Here, it is only necessary to ensure that the CNC workpiece fixing fixture corresponding to each spindle is based on the origin set in step S2. In addition, when it is necessary to switch to the first CNC processing of other new products, it is only necessary to process the corresponding positioning plate according to steps S5 and S6.

[0079] The CNC machining part fixing fixture provided in the embodiment of the present invention can not only realize the recycling and rapid switching of the CNC machining part fixing fixture, reduce the fixture manufacturing cost and improve the product processing efficiency, but also realize precise positioning and switch processing of different types of products on different dual-axis machines and multi-axis machines.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A CNC workpiece fixing fixture, used on CNC machine tools; characterized in that: include: A positioning plate for receiving a CNC machined part; the positioning plate is provided with a first adsorption groove, at least one first negative pressure through hole and at least one positioning boss, the first negative pressure through hole is arranged in a one-to-one correspondence with the positioning boss, and the first negative pressure through hole passes through the positioning plate; A pad, used to hold up the positioning plate, and the positioning plate is positioned on the pad via positioning pins; a first negative pressure chamber, a first vacuum suction pipe, a third negative pressure through hole and a plurality of second negative pressure through holes are provided on the pad, and the first vacuum suction pipe and the plurality of second negative pressure through holes are both connected to the first negative pressure chamber; A bottom plate is fixedly mounted on the CNC machining platform of the CNC machine tool and is used to hold up and fix the pad; a fourth negative pressure through hole is provided on the bottom plate, and the fourth negative pressure through hole is connected to the third negative pressure through hole; Wherein, the first vacuum suction pipe and the fourth negative pressure through hole are both connected to the vacuum negative pressure source, and the positioning plate is adsorbed on the pad through the first vacuum suction pipe, the first negative pressure cavity and the plurality of second negative pressure through holes in the negative pressure state; at the same time, the CNC machined part is adsorbed on the positioning plate through the fourth negative pressure through hole, the third negative pressure through hole, the first adsorption through groove and the first negative pressure through hole in the negative pressure state, the first adsorption through grooves are arranged in a staggered manner, and each of the first adsorption through grooves is arranged between the plurality of second negative pressure through holes, a first sealing ring and a plurality of second sealing rings are arranged on the top of the pad, the second sealing ring is arranged at the outer edge of the second negative pressure through hole, the first sealing ring is arranged at the outer edge of the area occupied by the plurality of second negative pressure through holes, the first sealing ring and the plurality of second sealing rings are both used to seal the cavity formed by the pad and the positioning plate being stacked, the positioning plate is provided with a positioning boss and a first negative pressure through hole, the top surface of the positioning boss is provided with a second adsorption through groove, and the first negative pressure through hole is connected to the second adsorption through groove and the first adsorption through groove.

2. The CNC machined part fixing fixture according to claim 1, characterized in that: The positioning plate is provided with a plurality of positioning bosses and a plurality of the first negative pressure through holes, and the positioning bosses are arranged in one-to-one correspondence with the first negative pressure through holes; the positioning boss is provided with an adsorption cavity, and the first negative pressure through hole is connected with the adsorption cavity and the first adsorption through groove.

3. The CNC machined part fixing fixture according to claim 2, characterized in that: The second negative pressure through hole includes a plurality of adsorption holes arranged in an array.

4. The CNC machined part fixing fixture according to claim 3, characterized in that: A second negative pressure chamber is dug on the top of the bottom plate, and the second negative pressure chamber is adapted to be relatively arranged with the first negative pressure chamber.

5. The CNC machined part fixing fixture according to claim 4, characterized in that: A third sealing ring and a fourth sealing ring are provided on the top of the bottom plate, the third sealing ring is used to seal the joint between the third negative pressure through hole and the fourth negative pressure through hole, and the fourth sealing ring is used to seal the cavity formed by the stacking of the pad and the bottom plate.

6. The CNC machined part fixing fixture according to claim 5, characterized in that: The positioning pin includes a first positioning pin and a second positioning pin. The outer diameter of the first positioning pin is larger than the outer diameter of the second positioning pin. The positioning plate is provided with a first positioning hole and a second positioning hole respectively matched with the first positioning pin and the second positioning pin.

7. A method for manufacturing a CNC machined part fixing fixture as claimed in claim 6, characterized in that: The following steps are involved: S1. Level the processed bottom plate and fix it on the CNC processing platform; wherein the bottom plate is provided with a plurality of threaded holes, a plurality of second countersunk holes, a second negative pressure cavity, a fourth negative pressure through hole, a second vacuum suction pipe, a third sealing ring groove and a fourth sealing ring groove; the second vacuum suction pipe is connected to the fourth negative pressure through hole, the third sealing ring groove is arranged at the outer edge of the fourth negative pressure through hole, and the fourth sealing ring groove is arranged at the outer edge of the second negative pressure cavity; S2, centering the bottom plate, setting and saving the origin; S3. Install the third sealing ring and the fourth sealing ring in the third sealing ring groove and the fourth sealing ring groove respectively, and fix the semi-finished pad plate on the top surface of the bottom plate; wherein, the semi-finished pad plate is provided with a plurality of first countersunk holes, a plurality of second negative pressure through holes, a third negative pressure through hole, a first negative pressure cavity, a first sealing ring groove, a second sealing ring groove and a first vacuum suction pipe; the first negative pressure cavity is relatively adapted to the second negative pressure cavity, the third negative pressure through hole is connected to the fourth negative pressure through hole, the first vacuum suction pipe and the plurality of the second negative pressure through holes are both connected to the first negative pressure cavity, the first countersunk hole is relatively adapted to the threaded hole, the second sealing ring groove is arranged at the outer edge of the second negative pressure through hole, the first sealing ring groove is arranged at the outer edge of the area occupied by the plurality of the second negative pressure through holes, and the second negative pressure through hole includes a plurality of adsorption holes arranged in an array; S4, taking the origin set in step S2 as a reference, processing a first positioning pin hole and a second positioning pin hole on the top surface of the backing plate semi-finished product to form the backing plate, and installing the first positioning pin, the second positioning pin, the first sealing ring and the second sealing ring in the first positioning pin hole, the second positioning pin hole, the first sealing ring groove and the second sealing ring groove respectively; S5. Install the semi-finished positioning plate on the top surface of the pad through the first positioning pin and the second positioning pin, connect the first vacuum suction pipe to the vacuum negative pressure source, and adsorb the semi-finished positioning plate on the pad through the first vacuum suction pipe, the first negative pressure chamber and the plurality of second negative pressure through holes in a negative pressure state; wherein the semi-finished positioning plate is provided with a first positioning hole, a second positioning hole and a first adsorption through groove, the first positioning hole and the second positioning hole are respectively matched with the first positioning pin and the second positioning pin, the first adsorption through groove is staggered and arranged between the plurality of second negative pressure through holes, and the first adsorption through groove is connected with the third negative pressure through hole; S6. Taking the origin set in step S2 as a reference, at least one first negative pressure through hole and at least one positioning boss are processed on the semi-finished positioning plate to form the positioning plate, and the positioning boss is compatible with the CNC machined part; wherein, the first negative pressure through hole passes through the positioning plate, and the first negative pressure through hole is connected to the first adsorption groove.

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