Method for processing a convex surface of a boss on an inner wall of a workpiece cavity and product
By dividing the boss into regions and using a combination of rounded-corner cutting tools and various forming tools for cutting, the problems of numerous tool marks and poor quality on the transition surface and undercut surface of the boss are solved, achieving high-precision and high-efficiency machining results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- FU TAI HUA IND SHENZHEN
- Filing Date
- 2023-04-13
- Publication Date
- 2026-05-15
AI Technical Summary
Existing cutting tools produce numerous tool marks, resulting in poor quality and a high scrap rate when machining transition surfaces and undercut surfaces of bosses on the inner wall of workpiece cavities.
The boss is divided into first and second machining areas using a rounded tool. The first area is cut to form a transition surface and a backing surface, respectively. Multiple forming tools are used in combination for cutting, and the cutting path and speed parameters are optimized.
It improves machining accuracy and quality, reduces tool marks, lowers scrap rate, and increases machining efficiency.
Smart Images
Figure CN116532722B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of machining technology, and in particular to a method and product for machining the curved surface of a boss on the inner wall of a workpiece cavity. Background Technology
[0002] In the CNC industry, the metal casings of electronic products, such as the back covers and mid-frames of mobile phones and tablet computers, and keyboard frames, are usually machined using three-axis CNC machining centers. During use, the product and fixture move along the X and Y directions (in the horizontal plane), while the Z direction is machined by the machine tool spindle for up-and-down milling motion (in the vertical plane). If the inner wall of the computer casing cavity has bosses, and the bosses are equipped with transition surfaces and undercut surfaces, although existing tools can machine the bosses, after machining, there are many tool marks on the transition surfaces and undercut surfaces of the bosses, resulting in poor quality. Summary of the Invention
[0003] In view of the above situation, it is necessary to provide a machining method and product for the curved surface of the boss on the inner wall of the workpiece cavity, so as to solve the technical problem that the existing tools have many tool marks and poor quality on the transition surface and undercut surface of the boss after machining the boss.
[0004] This application provides a method for machining a boss surface on the inner wall of a workpiece cavity, comprising the following steps: providing a workpiece, the workpiece including a cavity, a boss being provided on the inner wall of the cavity, the boss including a first end near the inner wall and a second end away from the inner wall; dividing the boss into a first machining area and a second machining area; using a rounded tool to cut the first machining area to form a transition surface between the first end and the second end; using the tool to cut the second machining area to form an undercut surface connected to the transition surface between the first end and the second end, thereby obtaining a product.
[0005] The above-described processing method uses a rounded-corner cutting tool to cut the first and second processing areas on the inner wall of the workpiece cavity boss, respectively, to form a transition surface and an undercut surface between the first and second ends of the boss, and to obtain the product. This method can not only process bosses with complex shapes, but also has high processing accuracy, fewer tool marks on the transition surface and undercut surface of the boss, and better processing quality.
[0006] In some embodiments, the method further includes: the cutting tool facing the boss and the axis of the cutting tool extending along a first direction; the cutting tool moving simultaneously along the first direction and / or a second direction perpendicular to the first direction to cut the first processing area or the second processing area; the cutting tool moving a preset distance along a third direction perpendicular to the first direction and the second direction respectively, and continuing to move simultaneously along the first direction and / or the second direction to cut the first processing area or the second processing area.
[0007] In some embodiments, the cutting tool includes a first forming tool and a second forming tool. The first forming tool includes a first shank and a first cutting portion connected together. The outer diameter of the first shank is smaller than the outer diameter of the first cutting portion. The end of the first cutting portion away from the first shank has a first fillet for cutting the first processing area. The second forming tool includes a second shank and a second cutting portion connected together. The outer diameter of the second shank is smaller than the outer diameter of the second cutting portion. The end of the second cutting portion near the second shank has a second fillet for cutting the second processing area. The method further includes: cutting the first processing area through the first fillet of the first cutting portion of the first forming tool to form a transition surface between the first end and the second end; and cutting the second processing area through the second fillet of the second cutting portion of the second forming tool to form an undercut surface between the first end and the second end.
[0008] In some embodiments, the feed speed of the first forming cutter ranges from 900 mm / min to 1100 mm / min, and the rotational speed ranges from 7500 rpm to 8500 rpm.
[0009] In some embodiments, the feed speed of the second forming blade ranges from 900 mm / min to 1100 mm / min, and the rotation speed ranges from 7500 rpm to 8500 rpm.
[0010] In some embodiments, the cutting tool includes a third forming tool, the third forming tool including a connected third shank and a third cutting portion, the outer diameter of the third shank being smaller than the outer diameter of the third cutting portion, the third cutting portion including a third fillet near the third shank and a fourth fillet away from the third shank, the third fillet near the third shank being used to cut the first machining area, and the fourth fillet away from the third shank being used to cut the second machining area, the method further comprising: cutting the first machining area through the third fillet of the third shank of the cutting tool to form a transition surface between the first end and the second end; and cutting the second machining area through the fourth fillet of the third shank of the third forming tool to form an undercut surface between the first end and the second end.
[0011] In some embodiments, the feed speed of the third forming cutter ranges from 300 mm / min to 600 mm / min, and the rotation speed ranges from 7500 rpm to 8500 rpm.
[0012] In some embodiments, the third fillet and the fourth fillet move along an arc-shaped trajectory and cut the first processing area and the second processing area.
[0013] In some embodiments, the method further includes: mounting the workpiece in a fixing device for fixing, and rotating the fixing device so that the workpiece faces the cutting tool.
[0014] This application also proposes a product including a cavity and a boss provided on the inner wall of the cavity, wherein the boss is provided with a transition surface and an undercut surface prepared by the processing method described above.
[0015] The product of this application is prepared by the above-described processing method, which uses a rounded tool to cut the first and second processing areas on the inner wall of the workpiece cavity boss to form a transition surface and an undercut surface between the first and second ends of the boss, and obtain the product. This method can not only process bosses with complex shapes, but also has high processing accuracy. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of a product proposed in one embodiment of this application.
[0017] Figure 2 This is a flowchart illustrating a method for machining the curved surface of a boss on the inner wall of a workpiece cavity, as proposed in one embodiment of this application.
[0018] Figure 3 yes Figure 1 The diagram shows a three-dimensional cross-sectional structure of the product at one angle.
[0019] Figure 4 This is a three-dimensional structural schematic diagram of a horizontal machining center proposed in one embodiment of this application.
[0020] Figure 5 yes Figure 4 A three-dimensional structural diagram of the fixing device of the horizontal machining center shown.
[0021] Figure 6 This is a three-dimensional structural diagram of a cutting tool and a workpiece according to an embodiment of this application.
[0022] Figure 7 yes Figure 6 The flowchart shows the specific method for the cutting tool to cut the first and second machining areas.
[0023] Figure 8 This is a three-dimensional structural diagram of another tool and workpiece proposed in one embodiment of this application.
[0024] Figure 9 yes Figure 8 The flowchart shows the specific method for the cutting tool to cut the first and second machining areas.
[0025] Explanation of main component symbols
[0026] Product 10
[0027] Cavity 11
[0028] Inner wall 12
[0029] 13 convex surfaces
[0030] Transition Surface 131
[0031] Inverted curved surface 132
[0032] First end 133
[0033] Second end 134
[0034] First processing area 135
[0035] Second processing area 136
[0036] Side wall 14
[0037] 20 knives
[0038] First forming blade 21
[0039] First handle 211
[0040] First cutting section 212
[0041] First fillet 213
[0042] Second forming blade 22
[0043] Second handle 221
[0044] Second cutting section 222
[0045] Second rounded corner 223
[0046] Third forming blade 23
[0047] Third handle 231
[0048] Third cutting section 232
[0049] Third rounded corner 233
[0050] Fourth fillet 234
[0051] Horizontal machining center 30
[0052] Fixing device 31
[0053] 311 load-bearing body
[0054] Fixture 312
[0055] Spindle 32 Detailed Implementation
[0056] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0057] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.
[0058] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0059] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0060] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0061] The embodiments of this application will be further described below with reference to the accompanying drawings.
[0062] Please see Figure 1 This application provides a product 10 for use in electronic devices, such as computers. The product 10 includes a cavity 11 and a boss 13 provided on the inner wall 12 of the cavity 11. The boss 13 is provided with a transition surface 131 and an undercut surface 132.
[0063] The boss 13 includes a first end 133 near the inner wall 12 and a second end 134 away from the inner wall 12. The transition surface 131 is a surface that smoothly transitions from the second end 134 to the first end 133 of the boss 13. The inverted surface 132 is an inverted surface that transitions from the second end 134 to the first end 133 of the boss 13.
[0064] It should be noted that undercut and non-undercut are professional terms in the CNC industry. Undercut is a common feature that end mills cannot machine. For example, if the tool is in the Z-axis direction (perpendicular to the ground, positive direction away from the ground, negative direction towards the ground), and there is a feature on the cavity wall of product 10 blocking the tool in the positive Z-axis direction, then the tool cannot machine the feature of product 10 in the negative direction. Otherwise, it will overcut the feature of product 10 that is blocking the tool. Overcutting the feature of product 10 will cause the product 10 to have a poor structure and be scrapped.
[0065] The transition surface 131 and the inverted surface 132 are both arc-shaped structures. The two ends of the transition surface 131 and the two ends of the inverted surface 132 are connected to form a closed ring structure.
[0066] In this embodiment, product 10 is a computer host casing. After product 10 is processed, a hole needs to be drilled at the boss 13 so that the power indicator light can pass through.
[0067] In this embodiment, the boss 13 has a dimension of 15.88 mm in the X-axis direction and 17.22 mm in the Z-axis direction. The minimum distance between the boss 13 and the adjacent sidewall 14 of the cavity 11 is 23 mm. Due to the small size between the boss 13 and the sidewall 14, conventional cutting tools are difficult to insert into the cavity 11 to machine the boss 13. Known technologies often use ordinary cutting tools, but these tools can only machine bosses 13 with simple structures. For bosses 13 with complex shapes, such as those with transition surfaces 131 and undercut surfaces 132, existing cutting tools, while capable of machining the boss 13, result in numerous tool marks on the transition surfaces 131 and undercut surfaces 132 after machining, leading to poor quality and a high scrap rate. Therefore, please refer to... Figure 2 This application provides a method for machining the curved surface of the boss 13 on the inner wall 12 of a workpiece cavity 11, used to machine the boss 13 on the inner wall 12 of the workpiece cavity 11 to obtain a transition surface 131 and an undercut surface 132. The method includes the following steps:
[0068] S21, a workpiece is provided, the workpiece includes a cuboid cavity 11, and a boss 13 is provided on the inner wall 12 of the cavity 11. The boss 13 includes a first end 133 near the inner wall 12 and a second end 134 away from the inner wall 12.
[0069] The workpiece is made of metal, such as aluminum alloy, but is not limited to this.
[0070] The boss 13 is formed by protrusion of part of the inner wall 12 of the workpiece cavity 11. The boss 13 can be frustum-shaped or frustum-shaped, but is not limited to these.
[0071] S22, please refer to Figure 3 The boss 13 is divided into a first processing area 135 and a second processing area 136.
[0072] The first processing area 135 is mainly used to process and form the transition surface 131. The second processing area 136 is mainly used to process and form the inverted surface 132. Dividing it into two areas is mainly to facilitate processing of the corresponding areas.
[0073] S23, using a rounded tool 20 to cut the first machining area 135 to form a transition surface 131 between the first end 133 and the second end 134.
[0074] Among them, the transition surface 131 is a surface that smoothly transitions from the second end 134 to the first end 133 of the boss 13.
[0075] S24, using a rounded tool 20 to cut the second machining area 136 to form an undercut surface 132 connected to the transition surface 131 between the first end 133 and the second end 134, thereby obtaining product 10.
[0076] Among them, the inverted curved surface 132 is an inverted curved surface extending from the second end 134 of the boss 13 to the first end 133.
[0077] The aforementioned cutting tool 20 can be a single forming tool or two different forming tools used together.
[0078] Please see Figure 4 and Figure 5 For ease of understanding, the first direction is defined as the Z-axis direction, the second direction as the Y-axis direction, and the third direction as the X-axis direction. In some embodiments, the method further includes:
[0079] The workpiece is installed in a fixing device 31 for fixation, and the fixing device 31 is rotated so that the workpiece is facing the tool 20.
[0080] The fixing device 31 is a horizontal fixture of the horizontal machining center 30. The fixing device 31 includes a supporting body 311 and a plurality of clamps 312 disposed around the supporting body 311. When a workpiece is placed on the supporting body 311, the plurality of clamps 312 can move toward the workpiece, thereby holding and fixing the workpiece. For example, there are eight clamps 312 to hold the four corners and sides of the workpiece respectively.
[0081] The spindle 32 of the horizontal machining center 30 extends along the Z-axis. In this embodiment, the spindle 32 is an expansion spindle.
[0082] Before processing, the workpiece must be installed on the fixing device 31. At this time, the workpiece is facing away from the spindle 32. Then, the horizontal machining center 30 controls the fixing device 31 to rotate 180 degrees so that the workpiece is facing the tool 20.
[0083] In some embodiments, the method further includes:
[0084] The tool 20 is directly opposite the boss 13 and the axis of the tool 20 extends along the first direction. The tool 20 moves simultaneously along the first direction and / or a second direction perpendicular to the first direction to cut the first machining area 135 or the second machining area 136.
[0085] The tool 20 moves a preset distance along a third direction perpendicular to the first and second directions respectively, and continues to move simultaneously along the first and / or second directions to cut the first machining area 135 or the second machining area 136.
[0086] Specifically, when machining the first machining area 135, the movement of the tool 20 is divided into two stages. In the first stage, the tool 20 moves simultaneously along the first direction and the second direction to cut the first machining area 135. Then, the tool 20 moves downward along the third direction by a first preset distance and continues to move simultaneously along the first direction and the second direction to continue cutting the first machining area 135. This process is repeated until the required size is reached, and then the second stage begins. It can be understood that the first preset distance can be set as needed, such as 1mm or 2mm, and is not specifically limited here. In the second stage, the tool 20 moves simultaneously along the first direction and the second direction, then along the second direction, and finally along the first direction and the second direction again. After that, the tool 20 moves downward along the third direction by a preset distance, and then continues to move simultaneously along the first direction and the second direction, then along the second direction, and finally along the first direction and the second direction again. This process is repeated until the first machining area 135 of the boss 13 is completed.
[0087] Specifically, when machining the second machining area 136, the movement of the tool 20 is divided into two stages. In the first stage, the tool 20 moves simultaneously along the first and second directions to cut the second machining area 136. Then, the tool 20 moves upward along the third direction by a second preset distance and continues to move simultaneously along the first and second directions to continue cutting the second machining area 136. This process is repeated until the required size is reached, and then the second stage begins. It can be understood that the second preset distance can be set as needed, such as 1mm or 2mm, without specific limitations. In the second stage, the tool 20 moves simultaneously along the first and second directions, then along the second direction, and finally along the first and second directions again. After that, the tool 20 moves upward along the third direction by a second preset distance. The tool 20 continues to move simultaneously along the first and second directions, then along the second direction, and finally along the first and second directions again. This process is repeated until the second machining area 136 of the boss 13 is completed.
[0088] In some embodiments, see Figure 6 The cutting tool 20 includes a first forming tool 21 and a second forming tool 22.
[0089] The first forming tool 21 includes a first shank 211 and a first cutting portion 212 connected together. The outer diameter of the first shank 211 is smaller than the outer diameter of the first cutting portion 212. The end of the first cutting portion 212 away from the first shank 211 has a first fillet 213 for cutting the first machining area 135. In this embodiment, the outer diameter of the first shank 211 is 4 mm, and the outer diameter of the first cutting portion 212 is 8 mm. The reason why the outer diameter of the first shank 211 is smaller than the outer diameter of the first cutting portion 212 is to avoid obstruction when machining the transition curved surface 131 on the boss 13, thereby facilitating machining. It can be understood that... Figure 6 The first forming blade 21 in the diagram is for illustrative purposes only.
[0090] The second forming tool 22 includes a connected second shank 221 and a second cutting portion 222. The outer diameter of the second shank 221 is smaller than the outer diameter of the second cutting portion 222. The end of the second cutting portion 222 near the second shank 221 has a second fillet 223 for cutting the second machining area 136. In this embodiment, the outer diameter of the second shank 221 is 4 mm, and the outer diameter of the second cutting portion 222 is 8 mm. The reason why the outer diameter of the second shank 221 is smaller than the outer diameter of the second cutting portion 222 is to avoid obstruction when machining the undercut curved surface 132 on the boss 13, thereby facilitating machining. It can be understood that... Figure 6 The second forming blade 22 in the diagram is only for illustrative purposes.
[0091] Please see Figure 7 The specific method for cutting the first machining area 135 and the second machining area 136 using a rounded tool 20 includes:
[0092] S23A, the first processing area 135 is cut by the first rounded corner 213 of the first cutting part 212 of the first forming blade 21 to form a transition surface 131 between the first end 133 and the second end 134;
[0093] S24A, the second processing area 136 is cut by the second rounded corner 223 of the second cutting part 222 of the second forming blade 22 to form an undercut surface 132 between the first end 133 and the second end 134.
[0094] The horizontal machining center 30 can be equipped with a tool magazine, in which the first forming tool 21 and the second forming tool 22 are placed. After the first forming tool 21 finishes machining the first machining area 135, the horizontal machining center 30 controls the spindle 32 to move the first forming tool 21 to the tool magazine and place it in the tool magazine. Then, the second forming tool 22 is installed on the spindle 32 and machined the second machining area 136.
[0095] The feed rate of the first forming cutter 21 ranges from 900 mm / min to 1100 mm / min, and the rotational speed ranges from 7500 rpm to 8500 rpm. This allows for a short machining time of 40 seconds for the transition surface 131, while also achieving high machining accuracy and good machining quality. Preferably, the feed rate of the first forming cutter 21 ranges from 1000 mm / min, and the rotational speed ranges from 8000 rpm.
[0096] The second forming cutter 22 has a feed speed range of 900 mm / min to 1100 mm / min and a rotational speed range of 7500 rpm to 8500 rpm. This allows for a short machining time of 60 seconds for the undercut surface 132, while also achieving high machining accuracy and good machining quality. Preferably, the second forming cutter 22 has a feed speed range of 1000 mm / min and a rotational speed range of 8000 rpm.
[0097] In some embodiments, see Figure 8 The cutting tool 20 includes a third forming tool 23, which includes a connected third shank 231 and a third cutting portion 232. The outer diameter of the third shank 231 is smaller than the outer diameter of the third cutting portion 232. The third cutting portion 232 includes a third fillet 233 near the third shank 231 and a fourth fillet 234 away from the third shank 231. The third fillet 233 is near the third shank 231 and is used to cut the first machining area 135, while the fourth fillet 234 is away from the third shank 231 and is used to cut the second machining area 136. In this embodiment, the outer diameter of the second shank 221 is, for example, 4 mm, and the outer diameter of the second cutting portion 222 is, for example, 8 mm. The reason why the outer diameter of the second shank 221 is smaller than the outer diameter of the second cutting portion 222 is to avoid obstruction when machining the transition surface 131 and the undercut surface 132 on the boss 13, thereby facilitating machining.
[0098] In this embodiment, the third cutting part 232 is spherical, and the third forming blade 23 is roughly lollipop shaped.
[0099] Please see Figure 9 The specific method for cutting the first machining area 135 and the second machining area 136 using a rounded tool 20 includes:
[0100] S23B, the first processing area 135 is cut by the third fillet 233 of the third shank 231 of the third forming tool 23 to form a transition surface 131 between the first end 133 and the second end 134;
[0101] S24B, the second machining area 136 is cut by the fourth fillet 234 of the third shank 231 of the third forming tool 23 to form an undercut surface 132 between the first end 133 and the second end 134.
[0102] The third forming cutter 23 has a feed rate range of 300 mm / min to 600 mm / min and a rotational speed range of 7500 rpm to 8500 rpm. This allows for simultaneous processing of the first processing area 135 and the second processing area 136 using a single third forming cutter 23. Since tool changing is unnecessary, it saves tool change time, reduces processing time, increases efficiency, and produces better processing quality. Preferably, the feed rate range of the third forming cutter 23 is 450 mm / min and the rotational speed range is 8000 rpm.
[0103] The third fillet 233 and the fourth fillet 234 move along an arc-shaped trajectory and cut the first processing area 135 and the second processing area 136, thereby shortening the processing time and improving the processing efficiency.
[0104] The aforementioned product 10 is mainly processed through two methods, the first of which is:
[0105] The workpiece is mounted on the fixing device 31. At this time, the workpiece is facing away from the spindle 32. Then, the horizontal machining center 30 controls the fixing device 31 to rotate 180 degrees so that the workpiece is facing the T-shaped tool.
[0106] The feed rate of the first forming cutter 21 is set to 900 mm / min-1100 mm / min, and the rotation speed is set to 7500 rpm-8500 rpm. Then, in the first stage, the horizontal machining center 30 controls the spindle 32 to drive the first forming cutter 21 to move simultaneously along the first and second directions, thereby cutting the first machining area 135. Then, the first forming cutter 21 moves downward along the third direction by a first preset distance, and continues to move simultaneously along the first and second directions, continuing to cut the first machining area 135. This process is repeated until the required size is reached, and then the second stage begins. In the second stage, the first forming cutter 21 moves simultaneously along the first and second directions, then along the second direction, and finally along the first and second directions again. Then, the first forming cutter 21 moves downward along the third direction by a preset distance, and continues to move simultaneously along the first and second directions, then along the second direction, and finally along the first and second directions again. This process is repeated until the first machining area 135 of the boss 13 is completed.
[0107] The horizontal machining center 30 controls the spindle 32 to move the first forming tool 21 to the tool magazine and place it inside. Then, the second forming tool 22 is mounted on the spindle 32, with a feed rate of 900 mm / min to 1100 mm / min and a rotational speed of 7500 rpm to 8500 rpm. In the first stage, the second forming tool 22 moves simultaneously along the first and second directions to cut the second machining area 136. Next, the second forming tool 22 moves upwards a second preset distance along the third direction and continues to move simultaneously along the first and second directions. The cutting process continues in the second processing area 136 until the required size is reached, and then the process enters the second stage. In the second stage, the second forming cutter 22 moves simultaneously along the first and second directions, then along the second direction, and finally along the first and second directions again. After that, the second forming cutter 22 moves upward a second preset distance along the third direction. The second forming cutter 22 continues to move simultaneously along the first and second directions, then along the second direction, and finally along the first and second directions again. This process is repeated until the second processing area 136 of the boss 13 is completed, and the product 10 is obtained.
[0108] The second processing method is:
[0109] The workpiece is mounted on the fixing device 31. At this time, the workpiece is facing away from the spindle 32. Then, the horizontal machining center 30 controls the fixing device 31 to rotate 180 degrees so that the workpiece is facing the T-shaped tool.
[0110] The feed rate of the third forming tool 23 is set to 300 mm / min-600 mm / min, and the rotation speed range is 7500 rpm-8500 rpm. Then, the horizontal machining center 30 controls the spindle 32 to drive the third forming tool 23 to move in an arc-shaped trajectory and cut the first machining area 135.
[0111] The horizontal machining center 30 controls the spindle 32 to drive the third forming tool 23 to move in an arc-shaped trajectory and cut the second machining area 136 to obtain product 10;
[0112] The above-described processing method uses a rounded-corner tool 20 to cut the first processing area 135 and the second processing area 136 on the boss 13 of the inner wall 12 of the workpiece cavity 11, so as to form a transition surface 131 and an undercut surface 132 between the first end 133 and the second end 134 of the boss 13, and obtain the product 10. This method can not only process the boss 13 with complex shapes, but also has high processing accuracy. There are fewer tool marks on the transition surface 131 and the undercut surface 132 on the boss 13, resulting in better processing quality.
[0113] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be incorporated into this application. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it is clear that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural.
[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.
Claims
1. A method for machining the curved surface of a boss on the inner wall of a workpiece cavity, characterized in that, Includes the following steps: A workpiece is provided, the workpiece including a cavity, a boss being provided on the inner wall of the cavity, the boss including a first end near the inner wall and a second end away from the inner wall; The boss is divided into a first processing area and a second processing area; The first machining area is cut using the first rounded corner of the first forming blade included in the cutting tool to form a transition surface between the first end and the second end. The first forming blade includes a connected first shank and a first cutting part. The outer diameter of the first shank is smaller than the outer diameter of the first cutting part. The end of the first cutting part away from the first shank has the first rounded corner for cutting the first machining area. The second forming tool, including the second forming blade, is used to cut the second processing area to form an undercut surface connected to the transition surface between the first end and the second end, thereby obtaining a product. The second forming blade includes a connected second shank and a second cutting part. The outer diameter of the second shank is smaller than the outer diameter of the second cutting part. The second cutting part has a second rounded corner for cutting the second processing area at one end near the second shank. The cutting tool is directly opposite the boss and its axis extends along a first direction. The cutting tool moves simultaneously along the first direction and a second direction perpendicular to the first direction to cut the first processing area or the second processing area. The cutting tool moves a preset distance along a third direction perpendicular to the first direction and the second direction respectively, and continues to move simultaneously along the first direction and the second direction to cut the first processing area or the second processing area.
2. The machining method for the curved surface of the boss on the inner wall of the workpiece cavity as described in claim 1, characterized in that, The feed speed of the first forming cutter ranges from 900 mm / min to 1100 mm / min, and the rotation speed ranges from 7500 rpm to 8500 rpm.
3. The machining method for the curved surface of the boss on the inner wall of the workpiece cavity as described in claim 1, characterized in that, The feed speed of the second forming cutter ranges from 900 mm / min to 1100 mm / min, and the rotation speed ranges from 7500 rpm to 8500 rpm.
4. The machining method for the curved surface of the boss on the inner wall of the workpiece cavity as described in claim 1, characterized in that, The cutting tool includes a third forming tool, which includes a connected third shank and a third cutting part. The outer diameter of the third shank is smaller than the outer diameter of the third cutting part. The third cutting part includes a third fillet near the third shank and a fourth fillet away from the third shank. The third fillet is near the third shank and is used to cut the first machining area, and the fourth fillet is away from the third shank and is used to cut the second machining area. The method further includes: The first processing area is cut by the third fillet of the third shank of the third forming tool to form a transition surface between the first end and the second end; The second processing area is cut by the fourth fillet of the third shank of the third forming tool to form an undercut surface between the first end and the second end.
5. The machining method for the curved surface of the boss on the inner wall of the workpiece cavity as described in claim 4, characterized in that, The feed speed of the third forming cutter ranges from 300 mm / min to 600 mm / min, and the rotation speed ranges from 7500 rpm to 8500 rpm.
6. The method for machining the curved surface of the boss on the inner wall of the workpiece cavity as described in claim 4 or 5, characterized in that, The third and fourth fillets move along an arc-shaped trajectory and cut the first and second processing areas.
7. The method for machining the curved surface of the boss on the inner wall of the workpiece cavity as described in claim 1, characterized in that, The method further includes: The workpiece is installed in a fixing device for fixation, and the fixing device is rotated so that the workpiece is facing the cutting tool.
8. A product characterized in that, It includes a cavity and a boss provided on the inner wall of the cavity, wherein the boss is provided with a transition surface and an undercut surface prepared by the processing method according to any one of claims 1-7.