Non-ferromagnetic workpiece clamping device and method

Abstract

The invention discloses a non-ferromagnetic workpiece clamping device and method, and relates to the technical field of non-ferromagnetic workpiece clamping. Comprising a lower die used for bearing a non-ferromagnetic workpiece, an embedded electromagnet embedded in the lower die, and at least two pressing pieces which are used for being arranged above the non-ferromagnetic workpiece and can be attracted by the embedded electromagnet. The pressing pieces and the embedded electromagnets are arranged on the upper portion and the lower portion of the non-ferromagnetic workpiece correspondingly to achieve clamping of the non-ferromagnetic workpiece, the non-ferromagnetic workpiece is not affected by factors such as gravity in the clamping and machining process, the number of the pressing pieces is at least two, and when the non-ferromagnetic workpiece is machined, the non-ferromagnetic workpiece is clamped through the embedded electromagnets. According to the non-ferromagnetic workpiece clamping device, the pressing piece at the position to be machined can be removed, the non-ferromagnetic workpiece can be continuously clamped through the pressing pieces at other positions, and the machining precision of the non-ferromagnetic workpiece is improved on the basis that it is guaranteed that the non-ferromagnetic workpiece is firmly clamped.

Description

Technical Field

[0001] The present invention relates to the technical field of non-ferromagnetic workpiece clamping, and particularly relates to a non-ferromagnetic workpiece clamping device and method. Background Art

[0002] Materials can be divided into ferromagnetic materials and non-ferromagnetic materials according to whether they are magnetically conductive. Aluminum alloy is a non-ferromagnetic material. Aluminum alloy has many advantages:

[0003] Such as light weight and high specific strength. The density of aluminum alloy is only 1 / 3 of that of steel. However, through alloying and heat treatment processes, the weight of spacecraft can be significantly reduced, and the launch efficiency can be improved.

[0004] Such as excellent corrosion resistance and thermal stability. The dense oxide film formed on the surface of aluminum alloy can resist oxidation and corrosion in the space environment.

[0005] Such as processing performance and design flexibility. Aluminum alloy is easy to cast, forge, extrude and weld, and can be processed into complex thin-walled components.

[0006] Therefore, due to its light weight, high strength, corrosion resistance and machinability, aluminum alloy has become the first choice for spacecraft structural materials. At the same time, the continuous innovation of domestic technology promotes its greater value in high-performance aerospace equipment. Aluminum alloy workpieces, such as aluminum alloy shells, are usually made from aluminum alloy plates through a series of processes. Before processing, it is first necessary to use a clamping tooling to fix the aluminum alloy plate to ensure that the sheet material does not shake during processing, resulting in low processing accuracy and material loss. However, since aluminum alloy is a non-ferromagnetic material, it cannot be adsorbed in the form of adsorption. It can only be clamped by jaws on the aluminum alloy, or the aluminum alloy sheet is die-cast by relying on the gravity of the clamping device itself. During the process of clamping by jaws and pressing by the gravity of the clamping device itself, scratches and indentations will be caused on the surface of the aluminum alloy component, which is likely to cause the sheet to wrinkle and break, resulting in the accuracy and roughness of the aluminum alloy component not meeting the requirements. And in a low-gravity environment similar to space, the method of clamping by relying on the gravity of the clamping device itself is not applicable.

[0007] Therefore, it is necessary to develop and design a non-ferromagnetic workpiece clamping device and method, so that non-ferromagnetic workpieces are not affected by factors such as gravity during the processing process. On the basis of ensuring the firm clamping of non-ferromagnetic workpieces, improving the processing accuracy of non-ferromagnetic workpieces is an urgent technical problem that needs to be solved by those skilled in the art at present. Summary of the Invention

[0008] To solve the above problems, the present invention provides a non-ferromagnetic workpiece clamping device and method. By respectively arranging a pressing member and an embedded electromagnet above and below the non-ferromagnetic workpiece, the clamping of the non-ferromagnetic workpiece is achieved. And at least two pressing members are provided to realize the removal of the pressing members at corresponding positions, so that the non-ferromagnetic workpiece is not affected by factors such as gravity during the processing, and on the basis of ensuring the firm clamping of the non-ferromagnetic workpiece, the processing accuracy of the non-ferromagnetic workpiece is improved.

[0009] To achieve the above object, the present invention provides the following solutions:

[0010] A non-ferromagnetic workpiece clamping device includes a lower mold for supporting the non-ferromagnetic workpiece, an embedded electromagnet embedded in the lower mold, and a pressing member for being arranged above the non-ferromagnetic workpiece and being adsorbed by the embedded electromagnet. At least two pressing members are provided.

[0011] Preferably, it further includes a moving device for placing the pressing member on the non-ferromagnetic workpiece and removing the pressing member.

[0012] Preferably, the moving device includes a robotic arm and an electromagnet arranged at the working end of the robotic arm. The electromagnet is used for adsorbing and releasing the pressing member.

[0013] Preferably, within the coverage area of the non-ferromagnetic workpiece, the embedded electromagnets are arranged in an array form in the lower mold. The number of the embedded electromagnets is equal to the number of the pressing members, and the arrangement positions of the embedded electromagnets correspond to the positions of the pressing members one by one.

[0014] Preferably, the embedded electromagnet includes an electromagnetic coil and an iron core. The electromagnetic coils inside different embedded electromagnets are controlled by separate control circuits for the on and off of the electromagnetic coils.

[0015] Preferably, a groove for accommodating the embedded electromagnet is provided in the lower mold, and the embedded electromagnet is detachably installed in the groove.

[0016] Preferably, a lifting device for realizing the height adjustment of the embedded electromagnet is provided between the groove and the lower mold.

[0017] The present invention also discloses a non-ferromagnetic workpiece clamping method, which applies the non-ferromagnetic workpiece clamping device as described above, and includes the following steps:

[0018] Place the non-ferromagnetic workpiece on the lower mold;

[0019] Place the pressing member at the position corresponding to the embedded electromagnet on the non-ferromagnetic workpiece, and make the embedded electromagnet energized to realize the clamping of the non-ferromagnetic workpiece.

[0020] Preferably, before placing the pressing member on the non-ferromagnetic workpiece, determine the machining position of the non-ferromagnetic workpiece to be machined, and the pressing member avoids the machining position;

[0021] and / or,

[0022] After completing the machining of the current machining position of the non-ferromagnetic workpiece, place the pressing member corresponding to the current machining position on the non-ferromagnetic workpiece, and energize the embedded electromagnet corresponding to the current machining position; then remove the pressing member that affects the machining of the next machining position.

[0023] Preferably, before removing the pressing member that affects the machining of the next machining position, first cut off the electromagnetic coil in the embedded electromagnet corresponding to the pressing member to be removed.

[0024] The present invention has achieved the following technical effects compared with the prior art:

[0025] By respectively arranging a pressing member and an embedded electromagnet above and below the non-ferromagnetic workpiece to realize the clamping of the non-ferromagnetic workpiece, the non-ferromagnetic workpiece is not affected by factors such as gravity during the clamping and machining process, and the clamping of the non-ferromagnetic workpiece can be realized even in a low-gravity environment such as in space; and the pressing member is set to at least two, which can effectively ensure uniform clamping force at multiple positions of the non-ferromagnetic workpiece. In addition, when machining the non-ferromagnetic workpiece, the pressing member at the machining position can be removed, and the clamping of the non-ferromagnetic workpiece can be continuously realized through the pressing members at other positions, improving the machining accuracy of the non-ferromagnetic workpiece on the basis of ensuring firm clamping of the non-ferromagnetic workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Attached Figure 1 is a schematic diagram of the overall structure of the non-ferromagnetic workpiece clamping device disclosed in the present invention;

[0028] Attached Figure 2 is a schematic diagram of the layout structure of the embedded electromagnet of the non-ferromagnetic workpiece clamping device disclosed in the present invention;

[0029] Attached Figure 3 is a schematic diagram of the flowchart of the non-ferromagnetic workpiece clamping method disclosed in the present invention;

[0030] AttachedFigure 4 Schematic diagram for clamping of the non-ferromagnetic workpiece clamping device disclosed in the present invention

[0031] Among them, 1, rotating base; 2, first motor; 3, rotating arm; 4, electromagnet; 5, pressing member; 6, non-ferromagnetic workpiece; 7, lower mold; 8, support arm; 9, embedded electromagnet. Specific embodiments

[0032] The technical solutions in 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. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0034] The object of the present invention is to provide a non-ferromagnetic workpiece clamping device and method to change the current situation of clamping the workpiece by relying on the gravity of the clamping member itself. The non-ferromagnetic workpiece clamping device and method are not affected by factors such as gravity, and can improve the machining accuracy of the aluminum alloy shell while ensuring firm clamping of the non-ferromagnetic workpiece.

[0035] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Refer to Figure 1, in the non-ferromagnetic workpiece clamping device disclosed in the embodiments of the present invention, at least includes a lower mold 7 for supporting the non-ferromagnetic workpiece 6. An embedded electromagnet 9 is embedded in the lower mold 7. Above the lower mold 7, a pressing member 5 for clamping the non-ferromagnetic workpiece 6 is placed. The non-ferromagnetic workpiece 6 is placed between the embedded electromagnet 9 and the pressing member 5. The pressing member 5 is adsorbed by the embedded electromagnet 9 to achieve clamping of the non-ferromagnetic workpiece 6. At least two pressing members 5 are provided. By respectively arranging the pressing member 5 and the embedded electromagnet 9 above and below the non-ferromagnetic workpiece 6, clamping of the non-ferromagnetic workpiece 6 is achieved, so that the non-ferromagnetic workpiece 6 is not affected by factors such as gravity during clamping and processing. And at least two pressing members 5 are provided. When processing the non-ferromagnetic workpiece 6, the pressing member 5 at the position to be processed can be removed, and the clamping of the non-ferromagnetic workpiece 6 is continuously achieved through the pressing members 5 at other positions, improving the processing accuracy of the non-ferromagnetic workpiece 6 on the basis of ensuring firm clamping of the non-ferromagnetic workpiece 6.

[0037] It should be noted that the non-ferromagnetic workpiece 6 mentioned in this embodiment includes, but is not limited to, workpieces made of materials such as copper (Cu), aluminum (Al), zinc (Zn), lead (Pb), tin (Sn), gold (Au), silver (Ag), platinum (Pt), austenitic stainless steel, non-magnetic steel, aluminum alloy, etc. The non-ferromagnetic workpiece 6 here can be a plate-like member or a shell. Hereinafter, the processing of an aluminum alloy shell is taken as an example for illustration.

[0038] The pressing member 5 can be a ferromagnetic metal plate, such as an iron plate, a steel plate, etc.

[0039] Reference Figure 1 , in one embodiment, it further includes a moving device for placing the pressing member 5 on the non-ferromagnetic workpiece 6 and also capable of removing the pressing member 5 from the non-ferromagnetic workpiece 6. By setting the moving device, mechanized placement and removal of the pressing member 5 can be achieved, realizing automation of the operation.

[0040] Reference Figure 1 , as a preferred method, the moving device includes a robotic arm. An electromagnet 4 is provided at the working end of the robotic arm. The electromagnet 4 is used to adsorb and release the pressing member 5. By providing the electromagnet 4 at the working end of the robotic arm, the electromagnet 4 can adopt the method of energization and power-off to achieve the presence or absence of adsorption force. Through the adsorption force of the electromagnet 4, the pressing member 5 is placed and removed on the non-ferromagnetic workpiece 6.

[0041] It should be noted that the robotic arm includes a rotating base 1, a frame body disposed on the rotating base 1, and a first motor 2 disposed on the frame body. The frame body is rotatably connected to the support arm 8 by the first motor 2 to achieve the up-and-down swing of the support arm 8. A rotating arm 3 is provided at one end of the support arm 8 away from the first motor 2. A second motor is provided on the mating surface of the rotating arm 3 and the support arm 8. The output shaft of the second motor is perpendicular to the mating surface of the rotating arm 3 and the support arm 8 to achieve the rotation of the rotating arm 3 around the output shaft of the second motor. An electromagnet 4 is provided at the connecting end of the rotating arm 3 away from the support arm 8. By providing the robotic arm, the multi-degree-of-freedom movement of the electromagnet 4 can be achieved.

[0042] As a further optimized solution, a pressure sensor can also be provided on the end face of the electromagnet 4 for cooperating with the pressing member 5. When the pressing member 5 needs to be placed on the non-ferromagnetic workpiece 6, when the pressure sensor detects that the pressing member 5 contacts the non-ferromagnetic workpiece 6, the pressure sensor transmits a signal to the control system. The control system controls the electromagnet 4 to power off and controls the embedded electromagnet 9 to power on to achieve the clamping of the non-ferromagnetic workpiece 6. When the pressing member 5 needs to be removed from the non-ferromagnetic workpiece 6, when the pressure sensor detects that the electromagnet 4 contacts the pressing member 5, the pressure sensor transmits a signal to the control system. The control system controls the electromagnet 4 to power on and controls the embedded electromagnet 9 to power off to achieve the removal of the pressing member 5.

[0043] Reference Figure 1 and Figure 2 In one embodiment, within the coverage area of the non-ferromagnetic workpiece 6, the embedded electromagnets 9 are arranged in an array in the lower mold 7. The number of the embedded electromagnets 9 is equal to the number of the pressing members 5, and the arrangement positions of the embedded electromagnets 9 correspond one-to-one to the arrangement positions of the pressing members 5. By making the arrangement positions of the embedded electromagnets 9 correspond one-to-one to the arrangement positions of the pressing members 5, when the non-ferromagnetic workpiece 6 is an arc-shaped shell, the pressing member 5 will also be adsorbed by the corresponding embedded electromagnet 9 at its position, and the problem of the pressing member 5 slipping will not occur.

[0044] Reference Figure 1 and Figure 2 As a preferred method, the embedded electromagnet 9 includes an electromagnetic coil and an iron core. The electromagnetic coils inside different embedded electromagnets 9 are controlled by separate control circuits to turn on and off the electromagnetic coils. That is, the magnetism of different embedded electromagnets 9 is controlled separately. When machining is required for the machining area, the embedded electromagnet 9 at the machining area is controlled to power off. At this time, the embedded electromagnet 9 at the machining area loses its magnetism, and the pressing member 5 on the machining area is removed, which can meet the local pressing requirements of the non-ferromagnetic workpiece 6.

[0045] Reference Figure 1 and Figure 2, As a preferred method, a groove for accommodating the embedded electromagnet 9 is provided in the lower mold 7, and the embedded electromagnet 9 is detachably installed in the groove, which facilitates the replacement of the embedded electromagnet 9.

[0046] It should be noted that the embedded electromagnet 9 is snap-fitted with the groove. A snap-fitting groove matching the embedded electromagnet 9 can be provided in the groove to achieve the snap-fitting of the embedded electromagnet 9.

[0047] Reference Figure 1 and Figure 2 , As an implementation method, a jacking device for adjusting the height of the embedded electromagnet 9 is provided between the groove and the lower mold 7. When the non-ferromagnetic workpiece 6 to be processed is an arc-shaped shell or a plate-shaped workpiece with uneven thickness, the distance between the pressing member 5 and the corresponding embedded electromagnet 9 is different. This will result in inconsistent clamping forces of the pressing member 5 on the non-ferromagnetic workpiece 6. By setting the jacking device, when the non-ferromagnetic workpiece 6 is an arc-shaped shell or a plate-shaped workpiece with uneven thickness, the height of the embedded electromagnet 9 can be adjusted through the jacking device to ensure that the distance between the pressing member 5 and the corresponding embedded electromagnet 9 is consistent, thereby ensuring that the adsorption forces generated by the two are consistent, and making the clamping forces of the pressing members 5 at each position on the non-ferromagnetic workpiece 6 consistent.

[0048] The jacking device can be one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod.

[0049] It should be noted that the parameters of the embedded electromagnet 9 (such as adjusting the current magnitude) can also be adjusted to make the adsorption forces of different embedded electromagnets 9 on the pressing member 5 different, so as to adapt to the clamping of an arc-shaped shell or a plate-shaped workpiece with uneven thickness, and make the clamping forces of the pressing member 5 on the non-ferromagnetic workpiece 6 consistent.

[0050] Reference Figure 3 , The present invention also discloses a method for clamping a non-ferromagnetic workpiece, which uses the non-ferromagnetic workpiece clamping device described above and includes the following steps:

[0051] Place the non-ferromagnetic workpiece 6 on the lower mold 7;

[0052] Place the pressing member 5 on the non-ferromagnetic workpiece 6, and energize the embedded electromagnet 9 to achieve the clamping of the non-ferromagnetic workpiece 6.

[0053] Reference Figure 3 , As an implementation method, before placing the pressing member 5 on the non-ferromagnetic workpiece 6, first determine the position to be processed of the non-ferromagnetic workpiece 6, and the pressing member 5 avoids the position to be processed. At this time, there is no need to clamp the pressing member 5 at the position to be processed, which can improve work efficiency;

[0054] After completing the machining of the current machining position of the non-ferromagnetic workpiece 6, place the pressing member 5 corresponding to the current machining position at the position of the non-ferromagnetic workpiece 6 corresponding to the embedded electromagnet 9, energize the embedded electromagnet 9 corresponding to the current machining position, then remove the pressing member 5 that affects the machining of the next machining position, and perform machining on the next machining position;

[0055] After the machining is completed, the electromagnet 4 adsorbs the pressing member 5 and removes the pressing member 5 to release the clamping of the non-ferromagnetic workpiece 6.

[0056] It should be noted that Figure 3 the sheet material in the appendix refers to the non-ferromagnetic workpiece 6 in this embodiment, the steel plate to be adsorbed and the plate to be adsorbed both refer to the pressing member 5 in this embodiment, and the adsorption guide rail is the rotating arm connected to the electromagnet.

[0057] Refer to Figure 3 , as an implementation method, before removing the pressing member 5 that affects the machining of the next machining position, first cut off the electromagnetic coil in the embedded electromagnet 9 corresponding to the pressing member 5 to be removed, which can facilitate the removal of the pressing member 5.

[0058] Appendix Figure 4 is the schematic diagram of the clamping of the non-ferromagnetic workpiece 6 by the embedded electromagnet 9 and the pressing member 5 in the present invention. In order to clearly show the relationship between the embedded electromagnet 9, the pressing member 5 and the non-ferromagnetic workpiece 6, the embedded electromagnet 9 is exposed outside the lower die 7. Substantially, the embedded electromagnet 9 is embedded inside the lower die 7. When the embedded electromagnet 9 is energized, it adsorbs the pressing member 5, and then clamps the non-ferromagnetic workpiece 6.

[0059] In the present invention, in order to verify that the adsorption force between the embedded electromagnet 9 and the pressing member 5 can achieve the clamping of the non-ferromagnetic workpiece 6, a verification calculation is carried out:

[0060] Taking the thickness of the aluminum alloy sheet material as 3 mm as an example, calculate whether the non-ferromagnetic workpiece clamping device and method disclosed in the present invention are feasible. Assume that the diameter of the equivalent embedded electromagnet 9 iron core is 90 mm, the outer diameter of the embedded electromagnet 9 is 180 mm, the voltage is 24 v, the resistance of the electromagnetic coil is 7.2 Ω, the number of turns of the electromagnetic coil is 10000 turns, the friction coefficient between the lower surface of the pressing member 5 and the upper surface of the aluminum alloy sheet material is 0.4, and assume that the iron core and the pressing member 5 are high magnetic permeability materials.

[0061] For the force calculation between the embedded electromagnet 9 and the pressing member 5, the Maxwell electromagnetic suction formula is usually adopted:

[0062]

[0063] Among them

[0064] B - Magnetic induction intensity (T);

[0065] S - Magnetic pole area (m 2 );

[0066] μ0 = 4π×10 -7 H / m - Permeability of free space.

[0067] In this embodiment, since the thickness of the aluminum alloy sheet is small and it is non-magnetic, it can be approximately regarded as a vacuum gap. When the gap is small, the relationship between the magnetic induction intensity B and the gap δ can be approximated as:

[0068]

[0069] Where:

[0070] N - Number of turns of the electromagnetic coil;

[0071] I - Current of the electromagnetic coil;

[0072] δ - Gap;

[0073] μ0 - Permeability of free space.

[0074] The diameter of the iron core dc = 90 mm, then the magnetic pole area:

[0075]

[0076] The number of turns of the electromagnetic coil N = 10000 turns, and the current I = 24V / 7.2Ω = 3.33 A.

[0077] Then the magnetic induction intensity:

[0078]

[0079] Then the magnetic force between the lower die 7 and the pressing member 5:

[0080]

[0081] The normal pressure N of the attracted steel plate on the sheet = F = 68874 N.

[0082] Take Figure 2 as an example. Taking the removal of one of the embedded electromagnets 9 in the processing area in this example, the normal pressure drops by 1 / 9;

[0083]

[0084] According to the data and the NOVEX cutting data estimation software calculation, the cutting feed force F f is approximately 12052 N, the radial force F p is approximately 12873 N, and the main cutting force F eApproximately 36522 N.

[0085] Then the frictional force between the steel plate and the sheet metal:

[0086] f = μN = 0.4 × 61221 = 24488.4 N

[0087] Then the frictional force f is greater than the feed cutting force F e and the radial cutting force F p , the sheet metal does not slide, and this clamping method is effective.

[0088] It can be verified that the principle of magnetic adsorption as the clamping force of aluminum alloy sheet metal is feasible.

[0089] Referring to the non-ferromagnetic workpiece clamping device and method of the present invention, it can meet the clamping requirements of non-ferromagnetic workpieces 6 in the aerospace environment, and at the same time greatly reduce the breakage of non-ferromagnetic workpieces 6 caused by surrounding clamping, reducing costs.

[0090] The technical problem to be solved by the present invention is to provide a device and method suitable for non-ferromagnetic workpieces, which improves the fracture problem of non-ferromagnetic workpieces 6 when clamped from all around. The device of this method is simple, highly operable, has good energy utilization rate, and there is no problem of damage to non-ferromagnetic workpieces 6 (aluminum alloy plates). It greatly solves the clamping problem of aluminum alloy plates in aerospace processing. Taking a 3-mm-thick flat aluminum plate as an example through calculation and simulation experiments, using this clamping device, the clamping of the aluminum plate can be completely achieved.

[0091] Compared with the prior art, the advantages of the present invention are:

[0092] Clamping is carried out using the principle of central pressure friction, solving the problem of sheet metal breakage caused by surrounding clamping of non-ferromagnetic workpieces 6, and significantly reducing costs.

[0093] Affected by external environmental factors such as gravity, it is suitable for low-gravity environments such as aerospace. By introducing the method of electromagnetic force, the clamping problem of non-ferromagnetic alloys in the aerospace low-gravity environment is solved.

[0094] There are few restrictions on the size of the sheet metal, and the size can be freely changed. It is suitable for clamping sheet metals of various sizes, and the parameters of the embedded electromagnet 9 can be set as needed to change the electromagnetic clamping force.

[0095] The present invention adopts an array control scheme, and can control the presence or absence of adsorption in the area according to processing requirements, solving the local processing problem of aluminum alloys.

[0096] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A non-ferromagnetic workpiece clamping device, characterized in that: The invention comprises a lower mold for supporting a non-ferromagnetic workpiece, an embedded electromagnet embedded in the lower mold, and a pressing member arranged above the non-ferromagnetic workpiece and capable of being adsorbed by the embedded electromagnet, wherein at least two pressing members are provided.

2. The non-ferromagnetic workpiece clamping device according to claim 1, characterized in that: The invention also includes a moving device for placing the pressing member on the non-ferromagnetic workpiece and removing the pressing member.

3. The non-ferromagnetic workpiece clamping device according to claim 2, characterized in that: The moving device includes a mechanical arm and an electromagnet arranged at a working end of the mechanical arm, and the electromagnet is used to absorb and release the pressing member.

4. The non-ferromagnetic workpiece clamping device according to claim 1, characterized in that: In the coverage area of the non-ferromagnetic workpiece, the embedded electromagnets are arranged in the lower mold in an array form, the number of the embedded electromagnets is equal to the number of the pressing parts, and the layout positions of the embedded electromagnets correspond one-to-one to the positions of the pressing parts.

5. The non-ferromagnetic workpiece clamping device according to any one of claims 1 to 4, characterized in that: The embedded electromagnet includes an electromagnetic coil and an iron core. The electromagnetic coil inside the embedded electromagnet is controlled by a separate control circuit to turn on and off the electromagnetic coil.

6. The non-ferromagnetic workpiece clamping device according to claim 4, characterized in that: A groove for accommodating the embedded electromagnet is provided in the lower mold, and the embedded electromagnet is detachably installed in the groove.

7. The non-ferromagnetic workpiece clamping device according to claim 6, characterized in that: A lifting device for adjusting the height of the embedded electromagnet is provided between the groove and the lower mold.

8. A method for clamping a non-ferromagnetic workpiece, characterized in that: The application of the non-ferromagnetic workpiece clamping device according to any one of claims 1 to 7 comprises the following steps: placing a non-ferromagnetic workpiece on the lower die; The pressing member is placed at a position corresponding to the non-ferromagnetic workpiece and the embedded electromagnet, and the embedded electromagnet is energized to clamp the non-ferromagnetic workpiece.

9. The non-ferromagnetic workpiece clamping method according to claim 8, characterized in that: Before placing the pressing member on the non-ferromagnetic workpiece, a position of the non-ferromagnetic workpiece to be processed is determined, and the pressing member avoids the position to be processed; and / or, After completing the processing of the current position to be processed of the non-ferromagnetic workpiece, the clamping member corresponding to the current position to be processed is placed on the non-ferromagnetic workpiece, and the embedded electromagnet corresponding to the current position to be processed is energized; then the clamping member that affects the processing of the next position to be processed is removed.

10. The non-ferromagnetic workpiece clamping method according to claim 9, characterized in that: Before removing the pressing member that affects the processing of the next position to be processed, the electromagnetic coil in the embedded electromagnet corresponding to the pressing member to be removed is first powered off.

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