Processing Method and Processing Device for Hemispherical Shell Parts with Unequal Wall Thickness

Abstract

The present invention discloses a processing method and a processing device for a hemispherical thin-walled shell part with unequal wall thicknesses. The processing method includes: a blanking step: selecting and processing a circular thin plate blank according to the maximum wall thickness and the unfolded size of the hemispherical thin-walled shell part with unequal wall thicknesses; a stamping step: loading the circular thin plate blank into a stamping female die of a stamping fixture, and stamping the circular thin plate blank by a stamping male die of the stamping fixture installed on a punch head of a punching press to form a semi-finished product curved blank; a lathe processing step: after fixing the semi-finished product curved blank by a lathe fixture, processing the semi-finished product curved blank by a lathe to sequentially form the end face, the inner curved surface and the outer curved surface of the hemispherical thin-walled shell part with unequal wall thicknesses.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly relates to a machining method and a machining device for a hemispherical thin-walled shell part with unequal thicknesses. Background Art

[0002] Please refer to Figure 1 , Figure 1 which is a schematic structural view of a hemispherical thin-walled shell part with unequal thicknesses. Figure 1 As shown, the hemispherical thin-walled shell part with unequal thicknesses belongs to a protective part of important parts installed inside a product cabin, and its material is generally copper material, such as T2M purple copper. In the field of machining, it is often encountered to machine this type of part. Since both the inner and outer shapes of this part are curved surfaces, that is, it includes an outer curved surface PS and an inner curved surface IS and the thickness of the part is also uneven, it is difficult to clamp during machining; moreover, this type of protective part has extremely strict requirements on dimensions and precision, so the requirements for the processing process method for machining it are also very strict, such as the processing sequence, etc. The inventor has found in actual applications that the existing methods result in low machining efficiency of the part; at the same time, the inventor has also found that if bar stock is selected during material selection, it will also cause waste of materials.

[0003] Therefore, there is an urgent need to develop a machining method and a machining device for a hemispherical thin-walled shell part with unequal thicknesses that overcome the above defects. Summary of the Invention

[0004] In view of the above problems, the present invention provides a machining method and a machining device for a hemispherical thin-walled shell part with unequal thicknesses, which include:

[0005] Blanking step: Select and machine a circular thin plate blank according to the maximum wall thickness and the unfolded size of the hemispherical thin-walled shell part with unequal thicknesses;

[0006] Stamping step: Load the circular thin plate blank into a stamping die of a stamping fixture, and perform stamping on the circular thin plate blank through a stamping punch of the stamping fixture installed on a punch press head to form a semi-finished curved surface blank;

[0007] Lathe machining step: After fixing the semi-finished curved surface blank through a lathe fixture, machine the semi-finished curved surface blank through a lathe to sequentially form the end face, the inner curved surface and the outer curved surface of the hemispherical thin-walled shell part with unequal thicknesses.

[0008] In the above machining method, the stamping step includes:

[0009] Fix one end of the stamping die on the central hole of a workbench, and the other end of the stamping die has a concave surface;

[0010] Mount the circular thin plate blank on the stamping female die;

[0011] Mount the stamping male die on the punch head of the punching press;

[0012] Stamp the circular thin plate blank with the stamping male die to form the semi-finished product curved surface blank.

[0013] In the above processing method, the semi-finished product curved surface blank has an outer curved surface, an inner curved surface opposite to the outer curved surface, and a connecting surface connecting the outer curved surface and the inner curved surface. The lathe processing steps include:

[0014] End face and partial outer shape curved surface processing step: After fixing the inner curved surface and the middle part of the outer curved surface of the semi-finished product curved surface blank with the first lathe fixture assembly, process the connecting surface of the semi-finished product curved surface blank with the lathe to form the end face of the hemispherical unequal-thickness and unequal-wall-thickness cover shell part, and process the outer curved surface of the semi-finished product curved surface blank outside the middle part with the lathe to form part of the outer shape curved surface of the hemispherical unequal-thickness and unequal-wall-thickness cover shell part;

[0015] Inner curved surface processing step: After fixing part of the outer shape curved surface and the end face with the second lathe fixture assembly, process the inner curved surface of the semi-finished product curved surface blank with the lathe to form the inner shape curved surface of the hemispherical unequal-thickness and unequal-wall-thickness cover shell part;

[0016] Middle part outer shape curved surface processing step: After fixing the inner shape curved surface and part of the outer shape curved surface with the third lathe fixture assembly, process the outer curved surface of the middle part of the semi-finished product curved surface blank with the lathe to finally form the outer shape curved surface of the hemispherical unequal-thickness and unequal-wall-thickness cover shell part.

[0017] In the above processing method, the end face and partial outer shape curved surface processing step includes:

[0018] Mount one end of the first lathe male die on a chuck of the lathe. The other end of the first lathe male die has a first curved surface, and the first curved surface is adapted to the inner curved surface;

[0019] Mount the semi-finished product curved surface blank on the first lathe male die so that the inner curved surface fits the first curved surface;

[0020] Mount the first lathe female die in the middle of the outer curved surface. One end of the first lathe female die has a second curved surface adapted to the middle of the outer curved surface;

[0021] Clamp the semi-finished product curved surface blank by abutting the tailstock center of the lathe against the first lathe female die;

[0022] The end face of the hemispherical thin-walled shell part with unequal thickness is formed by machining the connecting surface through the lathe, and part of the outer surface of the hemispherical thin-walled shell part with unequal thickness is formed by machining the outer surface not covered by the first lathe female die. The protruding part of the outer surface in the middle protrudes from the outer surface.

[0023] The above processing method, wherein the processing steps of the end face and part of the outer surface further include:

[0024] The outer circular stop is formed on the end face by machining the end face through the lathe.

[0025] The above processing method, wherein the processing steps of the inner surface include:

[0026] One end of the second lathe female die is installed on the chuck. A part of the plane at the other end of the second lathe female die is recessed inward to form a third surface adapted to the outer surface and a first annular platform part surrounding the third surface. A positioning hole is provided in the middle of the second lathe female die, and the positioning hole communicates with the third surface;

[0027] The semi-finished product curved surface blank is installed on the second lathe female die and located in the first annular platform part, so that the third surface fits on part of the outer surface, and the outer surface in the middle is clamped in the positioning hole;

[0028] The end face is fixed on the first annular platform part by the pressing end face of the first annular fixing part;

[0029] The inner surface of the hemispherical thin-walled shell part with unequal thickness is formed by machining the inner surface through the lathe.

[0030] The above processing method, wherein the processing steps of the middle outer surface include:

[0031] One end of the third lathe male die is installed on the chuck. A part of the plane at the other end of the third lathe male die protrudes outward to form a fourth surface adapted to the inner surface and a second annular platform part surrounding the fourth surface;

[0032] The semi-finished product curved surface blank is installed on the third lathe male die and located in the second annular platform part, so that the fourth surface fits on the inner surface;

[0033] Part of the outer surface is fixed on the third lathe male die by the pressing surface of the second annular fixing part;

[0034] The outer surface in the middle is machined by the lathe to form the outer contour surface in the middle, and the outer contour surface in the middle and part of the outer contour surface form the final outer contour surface of the hemispherical unequal-thickness wall housing part.

[0035] The above processing method, wherein the blanking step includes:

[0036] Select a plate with a thickness greater than the maximum wall thickness of the hemispherical unequal-thickness wall housing part to be machined according to the maximum wall thickness of the part;

[0037] Calculate the developed size of the hemispherical unequal-thickness wall housing part to be machined;

[0038] Cut the plate according to the part to obtain the circular thin plate blank.

[0039] The present invention also provides a processing device for a hemispherical unequal-thickness wall housing part. Among them, applying the processing method described in any one of the above, the processing device includes:

[0040] A stamping fixture, including a stamping female die and a stamping male die. The circular thin plate blank cut from a copper plate selected according to the maximum wall thickness and the developed size of the hemispherical unequal-thickness wall housing part to be machined is loaded into the stamping female die, and the circular thin plate blank is stamped by the stamping male die installed on the punch head of a punching press to form a semi-finished product curved surface blank. The semi-finished product curved surface blank has an outer surface, an inner surface opposite to the outer surface, and a connecting surface connecting the outer surface and the inner surface;

[0041] A lathe fixture, which includes:

[0042] A first lathe fixture assembly, installed on a chuck of a lathe and having a first curved surface adapted to the inner surface and a second curved surface adapted to the middle of the outer surface. After the semi-finished product curved surface blank is fixed by the first curved surface and the second curved surface, the lathe processes the connecting surface of the semi-finished product curved surface blank to form the end face of the hemispherical unequal-thickness wall housing part, and the lathe processes the outer surface outside the middle of the semi-finished product curved surface blank to form part of the outer contour surface of the hemispherical unequal-thickness wall housing part;

[0043] A second lathe fixture assembly, installed on the chuck and having a third curved surface adapted to the part of the outer contour surface. After the part of the outer contour surface is fixed to the third curved surface, the lathe processes the inner surface to form the inner contour surface of the hemispherical unequal-thickness wall housing part;

[0044] The third lathe fixture assembly is installed on the chuck and has a fourth curved surface that fits the inner curved surface. After the inner curved surface is fixed to the fourth curved surface, the outer curved surface in the middle is machined by the lathe to form the outer curved surface in the middle. The outer curved surface in the middle and the partial outer curved surface form the final outer curved surface of the hemispherical unequal-thickness wall cover part.

[0045] The above-mentioned processing device, wherein,

[0046] The first lathe fixture assembly includes:

[0047] A first lathe punch, one end of which is installed on the chuck and the other end of which has the first curved surface;

[0048] A first lathe die, one end of which has the second curved surface, the second curved surface is installed on the middle part of the outer curved surface, and the other end of the first lathe die is abutted by the tailstock center of the lathe to clamp the semi-finished curved surface blank;

[0049] The second lathe fixture assembly includes:

[0050] A second lathe die, one end of which is installed on the chuck, and a part of the plane at the other end is recessed inward to form the third curved surface and a first annular platform part surrounding the third curved surface. A positioning hole is provided in the middle of the second lathe die, and the positioning hole communicates with the third curved surface. The semi-finished curved surface blank is installed on the second lathe die and located in the first annular platform part, so that the third curved surface fits a part of the outer curved surface, and the outer curved surface in the middle is clamped in the positioning hole;

[0051] A first annular fixing member has a pressing end surface, and the end surface is fixed to the first annular platform part through the pressing end surface;

[0052] The third lathe fixture assembly includes:

[0053] A third lathe punch, one end of which is installed on the chuck, and a part of the plane at the other end protrudes outward to form the fourth curved surface and a second annular platform part surrounding the fourth curved surface. The semi-finished curved surface blank is installed on the third lathe punch and located in the second annular platform part, so that the fourth curved surface fits the inner curved surface;

[0054] A second annular fixing member has a pressing curved surface, and the partial outer curved surface is fixed to the third lathe punch through the pressing curved surface.

[0055] The effect of the present invention relative to the prior art is:

[0056] 1. The hemispherical thin-walled and thick-walled shell parts are processed using sheet materials, solving the problem of serious material waste in the prior art when using bar materials for processing;

[0057] 2. Stamping jigs and lathe jigs are designed. During processing, the blanks are positioned and fixed by the stamping jigs and lathe jigs, and the blanks are processed in cooperation with a punching press and a lathe, solving the problem of difficult clamping during processing in the prior art;

[0058] 3. At the same time, in combination with the stamping jigs and lathe jigs, the processing process method for the hemispherical thin-walled and thick-walled shell parts is optimized, that is, the processing steps of the outer surface, inner surface, end face, and end face stop of the hemispherical thin-walled and thick-walled shell parts during processing are clarified, ensuring the processing quality and progress of the products;

[0059] 4. The structures of the jigs are stable and have versatility;

[0060] 5. Through the present invention, while greatly improving the processing efficiency of the hemispherical thin-walled and thick-walled shell parts, the quality stability requirements for batch production of the parts are ensured.

[0061] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0063] Figure 1 It is a structural schematic diagram of the hemispherical thin-walled and thick-walled shell parts;

[0064] Figure 2 It is a flow chart of the processing method of the present invention;

[0065] Figure 3 It is a schematic diagram of the positioning and clamping method of the circular thin plate blank;

[0066] Figure 4 It is a structural schematic diagram of the semi-finished product curved surface blank;

[0067] Figure 5 For Figure 2 It is a sub-step flow chart of step S3 in

[0068] Figure 6 Schematic diagram of the first lathe fixture assembly clamping a semi-finished curved blank

[0069] Figure 7 Schematic diagram of the second lathe fixture assembly clamping a semi-finished curved blank

[0070] Figure 8 Schematic diagram of the third lathe fixture assembly clamping a semi-finished curved blank

[0071] Figure 9 Schematic diagram of the structure of the stamping fixture Detailed implementation manners

[0072] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, 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 some but not all of the embodiments of the present invention. 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 scope of protection of the present invention

[0073] The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention. In addition, the same or similar reference numerals of elements / components used in the drawings and embodiments are used to represent the same or similar parts

[0074] Regarding the "first", "second", "S1", "S2",... used in this article, they do not particularly refer to the meaning of order or sequence, nor are they used to limit the present invention. They are only used to distinguish elements or operations described with the same technical terms

[0075] Regarding the directional terms used in this article, such as: up, down, left, right, front or back, etc., they are only references to the directions in the drawings. Therefore, the directional terms used are for explanation and not for limiting this creation

[0076] Regarding the "comprising", "including", "having", "containing", etc. used in this article, they are all open-ended terms, that is, they are meant to include but not limited to

[0077] Regarding the "and / or" used in this article, it includes any one or all combinations of the described things

[0078] Regarding the "multiple" in this article, it includes "two" and "more than two"; regarding the "multiple groups" in this article, it includes "two groups" and "more than two groups"

[0079] Certain terms used to describe this application will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of this application

[0080] Please refer to Figure 2 , Figure 2 , which is the flow chart of the processing method of the present invention. As Figure 2 shown, a processing method for a hemispherical thin-walled and thick-walled housing part of the present invention includes:

[0081] Blanking step S1: Select and process a circular thin plate blank B1 according to the maximum wall thickness and the unfolded size of the hemispherical thin-walled and thick-walled housing part;

[0082] Stamping step S2: Place the circular thin plate blank B1 into a stamping die 21 of a stamping fixture, and perform stamping on the circular thin plate blank through a stamping punch 22 of the stamping fixture installed on a punch press to form a semi-finished curved blank B2;

[0083] Lathe processing step S3: After fixing the semi-finished curved blank B2 through a lathe fixture, process the semi-finished curved blank B2 through a lathe to sequentially form the end face ES, the inner curved surface IS, and the outer curved surface PS of the hemispherical thin-walled and thick-walled housing part.

[0084] Among them, in the blanking step S1, it includes: selecting a plate with a thickness greater than the maximum wall thickness according to the maximum wall thickness of the hemispherical thin-walled and thick-walled housing part to be processed; calculating the unfolded size of the hemispherical thin-walled and thick-walled housing part to be processed; cutting the plate according to the part to obtain the circular thin plate blank B1.

[0085] Specifically, in this embodiment, a copper plate with a suitable thickness is selected according to the maximum wall thickness t1 of the part. Generally, a copper plate with a thickness greater than the maximum wall thickness t1 is selected. Then, the part is unfolded and the diameter is calculated according to the size after unfolding the part, that is, the arc length between the midpoints E and F of the end faces at both ends of the part is calculated. The arc length plus a certain allowance is used as the diameter, and a circular thin plate blank B1 is formed after cutting on the copper plate.

[0086] Further, please refer to Figures 3 - 4 , Figure 3 , which is a schematic diagram of the positioning and clamping method of the circular thin plate blank; Figure 4 is a schematic structural diagram of the semi-finished curved blank. As Figures 2 - 4 shown, in the stamping step S2, it includes:

[0087] Fix one end of the stamping die 21 on a workbench T, and the other end of the stamping die has an inner concave surface IC;

[0088] Place the circular thin plate blank B1 on the stamping die 21;

[0089] Mount the stamping punch 22 on the punch P of the punching machine;

[0090] Stamp the circular thin plate blank B1 with the stamping punch 22 to form the semi-finished product curved surface blank B2.

[0091] Specifically, first, fix the stamping die 21 of the stamping fixture on the workbench with a pressing plate, load the circular thin plate blank of the part into the die positioning circle 211 of the stamping die 21, and then install the stamping punch 22 of the stamping fixture on the punch P of the punching machine. After stamping with the stamping punch 22, the semi-finished product curved surface blank of the part is formed.

[0092] Furthermore, the semi-finished product curved surface blank B2 has an outer curved surface B21, an inner curved surface B22 opposite to the outer curved surface, and a connecting surface B23 connecting the outer curved surface and the inner curved surface. The lathe processing step S3 includes:

[0093] End face and partial outer shape curved surface processing step S31: After fixing the inner curved surface B22 and the middle part of the outer curved surface B21 of the semi-finished product curved surface blank B2 with the first lathe fixture assembly, process the connecting surface B23 of the semi-finished product curved surface blank with the lathe to form the end face ES of the hemispherical unequal-thickness and unequal-wall shell part, and process the outer curved surface B21 outside the middle part of the semi-finished product curved surface blank with the lathe to form a partial outer shape curved surface PS1 of the hemispherical unequal-thickness and unequal-wall shell part;

[0094] Inner curved surface processing step S32: After fixing a part of the outer shape curved surface PS1 and the end face ES with the second lathe fixture assembly, process the inner curved surface B22 of the semi-finished product curved surface blank B2 with the lathe to form the inner shape curved surface IS of the hemispherical unequal-thickness and unequal-wall shell part;

[0095] Middle outer shape curved surface processing step S33: After fixing the inner shape curved surface IS and a part of the outer shape curved surface PS with the third lathe fixture assembly, process the outer curved surface B21 in the middle part of the semi-finished product curved surface blank B2 with the lathe to finally form the outer shape curved surface PS of the hemispherical unequal-thickness and unequal-wall shell part.

[0096] Please refer to Figure 6 , Figure 6 For the schematic diagram of the clamping of the semi-finished product curved surface blank by the first lathe fixture assembly. As Figure 6As shown, in the end face and partial outer surface machining step S31, a first lathe fixture assembly is set up. The first lathe punch 31 of the first lathe fixture assembly is clamped on the chuck 61 of the lathe. The semi-finished curved surface blank B2 of the part is placed between the first lathe punch 31 and the second lathe die 32, and is tightened by the tailstock center 62 of the lathe. The end face ES of the part, the outer circular stop ES1 on the end face ES and the partial outer surface PS1 are formed through lathe machining.

[0097] Specifically, the end face and partial outer surface machining step S31 includes:

[0098] One end of the first lathe punch 31 is installed on a chuck 61 of the lathe. The other end of the first lathe punch 31 has a first curved surface C1, and the first curved surface C1 is adapted to the inner curved surface B22.

[0099] The semi-finished curved surface blank B2 is installed on the first lathe punch 31 so that the inner curved surface B22 fits the first curved surface C1.

[0100] The first lathe die 32 is installed in the middle of the outer curved surface B21. One end of the first lathe die 32 has a second curved surface C2 adapted to the middle of the outer curved surface B21.

[0101] The tailstock center 62 of the lathe is used to press against the first lathe die 32 to clamp the semi-finished curved surface blank B2 with the first lathe punch 31.

[0102] The lathe is used to machine the connection surface B23 to form the end face ES of the hemispherical unequal-thickness walled cover part. The lathe is used to machine the outer curved surface B21 not covered by the first lathe die 32 to form the partial outer surface PS1 of the hemispherical unequal-thickness walled cover part. The middle part of the outer curved surface B21 protrudes from the partial outer surface PS1.

[0103] Wherein, in this embodiment, the end face and partial outer surface machining step S1 further includes:

[0104] The lathe is used to machine the end face ES to form an outer circular stop ES1 on the end face ES.

[0105] Please refer to Figure 7 , Figure 7 is a schematic diagram of the clamping of the semi-finished curved surface blank by the second lathe fixture assembly. As Figure 7As shown, in the inner surface machining step S32, a second lathe fixture assembly is set up. Then, the part is loaded into the positioning stop 411 of the second lathe female die 41 of the second lathe fixture assembly. The first annular fixing member and the second lathe female die 41 are connected by connecting threads and the end face ES of the part is pressed. The inner surface IS of the part is formed by machining on the lathe.

[0106] Specifically, the inner surface machining step S32 includes:

[0107] One end of the second lathe female die 41 is installed on the chuck 61. A part of the plane at the other end of the second lathe female die 41 is recessed inward to form a third surface C3 adapted to the outer surface PS1 and a first ring platform T1 surrounding the third surface C3. A positioning hole 4111 is provided in the middle of the second lathe female die 41, and the positioning hole 4111 communicates with the third surface C3.

[0108] The semi-finished surface blank B2 is installed on the second lathe female die 41 and located in the first ring platform T1, so that the third surface C3 fits part of the outer surface PS1, and the outer surface B21 in the middle is clamped in the positioning hole 411.

[0109] The end face ES is fixed on the first ring platform T1 by the pressing end face 421 of the first annular fixing member 42.

[0110] The inner surface B22 is machined by the lathe to form the inner surface IS of the hemispherical unequal-thickness and -wall shell part.

[0111] Please refer to Figure 8 , Figure 8 which is a schematic diagram of the clamping of the semi-finished surface blank by the third lathe fixture assembly. As Figure 8 shown, in the middle outer surface machining step S33, a third lathe fixture is set up. Then, the semi-finished surface blank B2 is loaded into the punch positioning circle 511 of the third lathe punch 51 of the semi-finished surface blank B2. The second annular fixing member 52 and the third lathe punch 51 are connected by connecting threads and the end face and part of the outer surface PS1 that has been machined in the part of the outer surface machining step S31 are pressed. The final outer surface PS of the hemispherical unequal-thickness and -wall shell part is formed by machining the unprocessed outer surface B21 on the lathe.

[0112] Specifically, the middle outer surface machining step S33 includes:

[0113] One end of the third lathe punch 51 is installed on the chuck 61, and a partial plane at the other end of the third lathe punch 51 protrudes outward to form a fourth curved surface C4 adapted to the inner curved surface IS and a second annular table portion T2 surrounding the fourth curved surface C4;

[0114] Install the semi-finished curved surface blank B2 on the third lathe punch 51 and within the second annular table portion T2, such that the fourth curved surface C4 fits against the inner curved surface IS;

[0115] Fix a part of the outer curved surface PS to the third lathe punch 51 through the pressing curved surface 521 of the second annular fixing member 52;

[0116] Machine the outer curved surface B21 in the middle through the lathe to form the outer curved surface PS2 in the middle, and the outer curved surface PS2 in the middle and a part of the outer curved surface PS1 form the final outer curved surface PS of the hemispherical unequal-thickness and unequal-wall-thickness shell part.

[0117] Please refer to again Figure 9 , Figure 9 which is a structural schematic diagram of a stamping fixture, and in combination with Figures 6 - 8 . The present invention also provides a processing device for a hemispherical unequal-thickness and unequal-wall-thickness shell part. Applying the processing method described above, the processing device includes: a stamping fixture and a lathe fixture.

[0118] Among them, the stamping fixture includes a stamping female die 21 and a stamping male die 22. A circular thin plate blank cut from a copper plate selected according to the maximum wall thickness and the unfolded size of the to-be-processed hemispherical unequal-thickness and unequal-wall-thickness shell part obtained through calculation is loaded into the stamping female die 21, and the circular thin plate blank is stamped by the stamping male die 22 installed on the punch head of a punching press to form a semi-finished curved surface blank B2. The semi-finished curved surface blank B2 has an outer curved surface B21, an inner curved surface B22 opposite to the outer curved surface, and a connecting surface B23 connecting the outer curved surface and the inner curved surface.

[0119] Among them, the lathe fixture includes: a first lathe fixture assembly, a second lathe fixture assembly, and a third lathe fixture assembly; the first lathe fixture assembly is installed on a chuck 61 of the lathe and has a first curved surface C1 adapted to the inner curved surface and a second curved surface C2 adapted to the middle part of the outer curved surface. After the semi-finished curved surface blank is fixed by the first curved surface C1 and the second curved surface C2, the lathe processes the connecting surface B23 of the semi-finished curved surface blank to form the end face ES of the hemispherical unequal-thickness walled cover part, and processes the outer curved surface B21 other than the middle part of the semi-finished curved surface blank by the lathe to form part of the outer curved surface PS1 of the hemispherical unequal-thickness walled cover part; the second lathe fixture assembly is installed on the chuck 61 and has a third curved surface C3 adapted to the part of the outer curved surface. After the part of the outer curved surface is fixed to the third curved surface C3, the lathe processes the inner curved surface B22 to form the inner curved surface IS of the hemispherical unequal-thickness walled cover part; the third lathe fixture assembly is installed on the chuck 61 and has a fourth curved surface C4 adapted to the inner curved surface IS. After the inner curved surface IS is fixed to the fourth curved surface C4, the lathe processes the outer curved surface B21 in the middle part to form the outer curved surface PS2 in the middle part, and the outer curved surface PS2 in the middle part and the part of the outer curved surface PS1 form the final outer curved surface PS of the hemispherical unequal-thickness walled cover part.

[0120] Further, the middle part of one end of the stamping female die 21 is recessed and contracted inward to form a die positioning circle 211 and an inner concave surface IC in sequence. One end of the stamping female die 21 protrudes and contracts outward to form a positioning part 212. The positioning part 212 is installed in the positioning circular stop 71 of the workbench 7, and the stamping female die 21 is fixed to the workbench 7 by a pressing plate 23. Among them, the stamping female die 21 includes a first body 211 and a second body 212. The first body 211 is connected to the second body 212, and the second body 212 protrudes from the outer side surface of the first body 211. The middle part of the end face of the first body 211 away from the second body 212 is recessed and contracted inward to form a die positioning circle 2111 and an inner concave surface IC in sequence. The middle part of the end face of the second body 212 away from the first body 211 protrudes and contracts outward to form a positioning part 2121. In this embodiment, the stamping fixture further includes a pressing plate 23, and the part of the second body 212 protruding from the outer side surface of the first body 211 is fixed by the cooperation of the pressing plate 23 and a bolt 24 to fix the stamping female die 21 to the workbench 7. Among them, in this embodiment, the stamping fixture further includes a backing plate 25, which is arranged between the pressing plate 23 and the workbench 7. The backing plate 25 is used for the pressing plate 23 to better fix the stamping female die 21.

[0121] Among them, the stamping fixture further includes a support frame 26. The support frame 26 is installed on the punch head P of the punching machine. One end of the stamping punch 22 is connected to the support frame 26 by a screw 27. The other end of the stamping punch 22 has an arc surface 221. The circular thin plate blank B1 is stamped by the arc surface 221 to form the semi-finished curved surface blank B2.

[0122] Furthermore, the first lathe fixture assembly includes: a first lathe punch 31 and a first lathe die 32; one end of the first lathe punch 31 protrudes and contracts outward to form a first clamping portion 311 for being installed on the chuck 61. The other end of the first lathe punch 31 has a first curved surface C1 adapted to the inner curved surface B22; one end of the first lathe die 32 has a second curved surface C2 adapted to the middle of the outer curved surface B21. A connection hole K1 is provided at the other end of the second lathe die. After the semi-finished curved surface blank B2 is arranged between the first lathe punch 31 and the first lathe die 32, the tailstock center 62 of the lathe is used to abut against the connection hole K1, so that the first lathe punch 31 and the first lathe die 32 fix the finished curved surface blank B2.

[0123] Still further, the second lathe fixture assembly includes: a second lathe die 41 and a first annular fixing member 42; one end of the second lathe die 41 protrudes and contracts outward to form a second clamping portion 412 for being installed on the chuck 61. A part of the plane at the other end of the second lathe die 41 is recessed inward to form the third curved surface C3 and a first annular platform portion T1 surrounding the third curved surface. A positioning hole 4111 is provided in the middle of the second lathe die. The positioning hole 4111 communicates with the third curved surface C3. The semi-finished curved surface blank is installed on the second lathe die 41 and located in the first annular platform portion T1, so that the third curved surface C3 fits against a part of the outer shape surface PS1, and the outer curved surface B21 in the middle is clamped in the positioning hole 411; the inner side of the first annular fixing member 42 is threadedly connected to the outer side of the second lathe die 41. The first annular fixing member 42 has a pressing end surface 421, and the end surface ES is fixed to the first annular platform portion by the pressing end surface 421. Among them, in this embodiment, the positioning hole 411 penetrates through the second lathe die 41.

[0124] Furthermore, the third lathe fixture assembly includes: a third lathe punch 51 and a second annular fixing member 52; one end of the third lathe punch 51 protrudes outward and contracts to form a third clamping portion 511 for being mounted on a chuck 61, and a part of the plane at the other end of the third lathe punch 51 protrudes outward to form the fourth curved surface C4 adapted to the internal curved surface IS and a second annular platform portion T2 surrounding the fourth curved surface C4. The semi-finished curved surface blank B2 is mounted on the third lathe punch 51 and located in the second annular platform portion T2, so that the fourth curved surface C4 fits the internal curved surface IS; the inner side of the second annular fixing member 52 is connected to the outer side of the third lathe punch 51 by a thread, and the inner end surface of the second annular fixing member 52 forms a pressing curved surface 521 adapted to a part of the external curved surface PS1, and the part of the external curved surface PS1 is fixed on the third lathe punch 51 through the pressing curved surface 521.

[0125] In summary, the present invention effectively solves the technical problems of material waste and low efficiency in the existing processing of hemispherical thick-walled and thin-walled cover parts, improves the processing efficiency of the parts, ensures the stability requirements of the mass production quality of the products, the processing technology method is advanced and reliable, the blank can be stably clamped in each process, and the fixture has good versatility.

[0126] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A processing method for a hemispherical thin-walled and thick-walled housing part with unequal thicknesses, characterized in that, Including: Blank cutting step: Select and process a circular thin plate blank according to the maximum wall thickness and the unfolded size of the hemispherical thin-walled shell part with unequal wall thicknesses; Stamping step: Place the circular thin plate blank into a stamping die of a stamping fixture, and stamp the circular thin plate blank through a stamping punch of the stamping fixture installed on a punch press to form a semi-finished curved surface blank; Lathe machining step: After fixing the semi-finished curved surface blank with a lathe fixture, machine the semi-finished curved surface blank with a lathe to sequentially form the end face, the inner curved surface, and the outer curved surface of the hemispherical thin-walled shell part; Wherein, the semi-finished curved surface blank has an outer curved surface, an inner curved surface opposite to the outer curved surface, and a connecting surface connecting the outer curved surface and the inner curved surface, and the lathe machining step includes: End face and partial outer curved surface machining step: After fixing the inner curved surface and the middle part of the outer curved surface of the semi-finished curved surface blank with a first lathe fixture assembly, machine the connecting surface of the semi-finished curved surface blank with the lathe to form the end face of the hemispherical thin-walled shell part, and machine the outer curved surface of the semi-finished curved surface blank outside the middle part with the lathe to form a part of the outer curved surface of the hemispherical thin-walled shell part; Inner curved surface machining step: After fixing a part of the outer curved surface and the end face with a second lathe fixture assembly, machine the inner curved surface of the semi-finished curved surface blank with the lathe to form the inner curved surface of the hemispherical thin-walled shell part; Middle part outer curved surface machining step: After fixing the inner curved surface and a part of the outer curved surface with a third lathe fixture assembly, machine the outer curved surface of the middle part of the semi-finished curved surface blank with the lathe to finally form the outer curved surface of the hemispherical thin-walled shell part.

2. The processing method according to claim 1, wherein The stamping step includes: Fix one end of the stamping die on the central hole of a workbench, and the other end of the stamping die has a concave surface; Place the circular thin plate blank on the stamping die; Install the stamping punch on the punch press head; Stamp the circular thin plate blank through the stamping punch to form the semi-finished curved surface blank.

3. The processing method according to claim 2, wherein The end face and partial outer curved surface machining step includes: Install one end of a first lathe punch on a chuck of the lathe, and the other end of the first lathe punch has a first curved surface, and the first curved surface is adapted to the inner curved surface; Place the semi-finished curved surface blank on the first lathe punch so that the inner curved surface fits the first curved surface; Install a first lathe die on the middle part of the outer curved surface, and one end of the first lathe die has a second curved surface adapted to the middle part of the outer curved surface; Clamp the semi-finished curved surface blank by pressing against the first lathe die with the tailstock center of the lathe; The end face of the hemispherical unequal-thickness wall cover part is formed by machining the joint surface with the lathe, and part of the outer surface of the hemispherical unequal-thickness wall cover part is formed by machining the outer surface not covered by the first lathe female die. The outer surface in the middle protrudes from part of the outer surface.

4. The processing method according to claim 3, characterized in that, The processing steps of the end face and part of the outer surface further include: The lathe is used to machine the end face to form an outer circular stop on the end face.

5. The processing method according to claim 3, wherein, The processing steps of the inner surface include: One end of the second lathe female die is installed on the chuck. Part of the plane at the other end of the second lathe female die is recessed inward to form a third surface adapted to the outer surface and a first annular table portion surrounding the third surface. A positioning hole is provided in the middle of the second lathe female die, and the positioning hole communicates with the third surface; The semi-finished surface blank is installed on the second lathe female die and located in the first annular table portion, so that the third surface fits against part of the outer surface, and the outer surface in the middle is clamped in the positioning hole; The end face is fixed to the first annular table portion by the pressing end face of the first annular fixing member; The lathe is used to machine the inner surface to form the inner surface of the hemispherical unequal-thickness wall cover part.

6. The processing method according to claim 5, wherein, The processing steps of the middle outer surface include: One end of the third lathe male die is installed on the chuck. Part of the plane at the other end of the third lathe male die protrudes outward to form a fourth surface adapted to the inner surface and a second annular table portion surrounding the fourth surface; The semi-finished surface blank is installed on the third lathe male die and located in the second annular table portion, so that the fourth surface fits against the inner surface; Part of the outer surface is fixed to the third lathe male die by the pressing surface of the second annular fixing member; The lathe is used to machine the outer surface in the middle to form the outer surface in the middle. The outer surface in the middle and part of the outer surface form the final outer surface of the hemispherical unequal-thickness wall cover part.

7. The processing method according to claim 2, characterized in that, The blanking steps include: According to the maximum wall thickness of the hemispherical unequal-thickness wall cover part to be processed, a plate with a thickness greater than the maximum wall thickness is selected; Calculate the developed size of the hemispherical unequal-thickness wall cover part to be processed; The plate is cut according to the part to obtain the circular thin plate blank.

8. A processing device for a hemispherical thin-walled and thick-walled housing part with unequal thicknesses, characterized in that, Applying the processing method according to any one of claims 1-7 above, the processing device includes: A stamping fixture, including a stamping female die and a stamping male die. A circular thin plate blank cut from a copper plate selected according to the maximum wall thickness and the developed size of the hemispherical unequal-thickness wall cover part to be processed obtained by calculation is loaded into the stamping female die, and the circular thin plate blank is stamped by the stamping male die installed on the punch head of a punching press to form a semi-finished surface blank. The semi-finished surface blank has an outer surface, an inner surface opposite to the outer surface, and a joint surface connecting the outer surface and the inner surface; A lathe fixture, which includes: The first lathe fixture assembly is installed on a chuck of a lathe and has a first curved surface adapted to the inner curved surface and a second curved surface adapted to the middle part of the outer curved surface. After the semi-finished curved surface blank is fixed by the first curved surface and the second curved surface, the lathe processes the connecting surface of the semi-finished curved surface blank to form the end surface of the hemispherical unequal-thickness wall shell part, and processes the outer curved surface outside the middle part of the semi-finished curved surface blank by the lathe to form part of the outer curved surface of the hemispherical unequal-thickness wall shell part; The second lathe fixture assembly is installed on the chuck and has a third curved surface adapted to the part of the outer curved surface. After the part of the outer curved surface is fixed to the third curved surface, the lathe processes the inner curved surface to form the inner curved surface of the hemispherical unequal-thickness wall shell part; The third lathe fixture assembly is installed on the chuck and has a fourth curved surface adapted to the inner curved surface. After the inner curved surface is fixed to the fourth curved surface, the lathe processes the outer curved surface in the middle to form the outer curved surface in the middle, and the outer curved surface in the middle and the part of the outer curved surface form the final outer curved surface of the hemispherical unequal-thickness wall shell part.

9. The processing device according to claim 8, wherein, The first lathe fixture assembly includes: A first lathe punch, one end of which is installed on the chuck and the other end of which has the first curved surface; A first lathe die, one end of which has the second curved surface, and the second curved surface is installed on the middle part of the outer curved surface. The other end of the first lathe die is abutted by the tailstock center of the lathe to clamp the semi-finished curved surface blank; The second lathe fixture assembly includes: A second lathe die, one end of which is installed on the chuck, and a part of the plane at the other end is recessed inward to form the third curved surface and a first annular platform part surrounding the third curved surface. A positioning hole is provided in the middle of the second lathe die, and the positioning hole communicates with the third curved surface. The semi-finished curved surface blank is installed on the second lathe die and located in the first annular platform part, so that the third curved surface fits against a part of the outer curved surface, and the outer curved surface in the middle is clamped in the positioning hole; A first annular fixing member, having a pressing end surface, and fixing the end surface to the first annular platform part through the pressing end surface; The third lathe fixture assembly includes: A third lathe punch, one end of which is installed on the chuck, and a part of the plane at the other end protrudes outward to form the fourth curved surface and a second annular platform part surrounding the fourth curved surface. The semi-finished curved surface blank is installed on the third lathe punch and located in the second annular platform part, so that the fourth curved surface fits against the inner curved surface; A second annular fixing member, having a pressing curved surface, and fixing the part of the outer curved surface to the third lathe punch through the pressing curved surface.

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