A method for turning a face T-shaped ring groove

Abstract

This invention relates to a turning method for an end face T-shaped annular groove, comprising the following steps: moving a straight grooving tool along a preset straight grooving machining path to remove the workpiece and obtain a straight groove; setting the machine tool spindle to a first rotation direction, moving a first inner grooving tool along a preset first side grooving machining path to remove the workpiece and obtain a first side grooving communicating with the straight groove; setting the machine tool spindle to a second rotation direction, moving the withdrawn first inner grooving tool along the workpiece diameter direction to the outside of the groove opening at the other end of the straight groove, moving the first inner grooving tool along a preset second side grooving machining path to remove the workpiece and obtain a second side grooving communicating with the straight groove. By employing the technical solution of this invention, the technical problems of relatively high processing cost, relatively low processing efficiency, asymmetry of the two sides of the end face T-shaped groove, and large processing dimensional errors in existing T-shaped annular grooves can be improved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a turning method for an end face T-shaped annular groove. Background Technology

[0002] The end face T-shaped annular groove consists of three parts: a straight groove (both annular groove structures), a first side groove, and a second side groove. When machining the end face T-shaped annular groove on a CNC lathe, the traditional method is to first machine the straight groove portion using a straight grooving tool, then machine the first and second side grooves sequentially using two internal grooving tools. After machining the first side groove with the first internal grooving tool and retracting it, the second internal grooving tool is used to machine the second side groove and retract it. When machining the first and second side grooves, the machine tool spindle is set to forward rotation. Machining the first side groove is a forward machining method, and machining the second side groove is a reverse machining method. Forward machining means that the tool feeds towards the operator; reverse machining means that the tool feeds away from the operator.

[0003] Regarding the above processing methods, from the perspective of production cost, the traditional processing of the end face T-shaped ring groove requires three tools: a straight groove cutter, a first inner groove cutter, and a second inner groove cutter, which is relatively expensive. From the perspective of production efficiency, the traditional processing method requires tool setting three times, resulting in low production efficiency. From the perspective of processing accuracy, due to the tool setting error of the first and second inner groove cutters, there are dimensional errors in the first and second side grooves, leading to asymmetry between the two side grooves and affecting the assembly of the end face T-shaped ring groove. From the perspective of lead screw backlash, the first side groove is processed in the forward direction, while the second side groove is processed in the reverse direction. The backlash of the lead screw will inevitably affect the symmetry and dimensional accuracy of the two side grooves of the end face T-shaped groove. Summary of the Invention

[0004] This invention provides a turning method for end face T-shaped ring grooves, which can relatively improve the technical problems of existing T-shaped ring grooves, such as relatively high processing cost, relatively low processing efficiency, asymmetry of the two sides of the end face T-shaped groove, and large processing dimensional errors.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A method for turning a T-shaped annular groove on an end face includes the following steps: Step 1: Provide the workpiece and clamp it onto the machine tool spindle; Step 2: Provide a straight fluting tool and clamp it on the machine tool tool holder. Turn on the machine tool and rotate the workpiece with the machine tool spindle. Move the straight fluting tool along the preset straight fluting machining path to remove the workpiece and obtain a straight flute. Then, remove and disassemble the straight fluting tool. Step 3: Provide the first inner groove tool and clamp it on the machine tool tool post. Turn on the machine tool and set the machine tool spindle to the first rotation direction. Make the workpiece rotate with the machine tool spindle and move the first inner groove tool along the preset first side groove processing path. Process and remove the workpiece to obtain the first side groove that communicates with the straight groove. Exit the first inner groove tool until it is outside the groove opening at one end of the straight groove. Step 4: Set the machine tool spindle to the second rotation direction, which is opposite to the first rotation direction. Move the first inner groove cutter that was withdrawn in Step 3 along the diameter direction of the workpiece to the outside of the groove at the other end of the straight groove, so that the workpiece rotates with the machine tool spindle. Move the first inner groove cutter along the preset second side groove processing path to process and remove the workpiece and obtain the second side groove that is connected to the straight groove. The straight groove, the first side groove and the second side groove are interconnected to form a T-shaped annular groove. Withdraw the first inner groove cutter.

[0006] The beneficial effects of this invention are: the first and second side grooves of the end face T-shaped ring groove are both processed in a double forward direction. Compared with the traditional forward and reverse processing methods, the number of tools is reduced from three to two, and the forward and reverse tool movement is changed to double forward tool movement. These changes in processing methods can effectively improve the processing accuracy and production efficiency of the end face T-shaped ring groove, as well as reduce production costs. It can also solve the problem of reduced part processing accuracy caused by the backlash of the machine tool lead screw.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, in step two, moving the straight groove cutter along a preset straight groove machining path to remove the workpiece and obtain a straight groove includes: adjusting the straight groove cutter to face the preset T-shaped annular groove machining position of the workpiece, and then performing straight groove turning machining.

[0009] Furthermore, in step two, the turning process of the straight groove specifically includes: moving the machine tool tool holder and causing the straight groove tool to move toward the workpiece along the thickness direction of the workpiece, turning the workpiece until a straight groove with the same depth as the preset T-shaped annular groove is obtained.

[0010] Furthermore, in step three, the first inner groove cutter is moved along the preset first side groove processing path to process and remove the workpiece in the forward direction and obtain the first side groove communicating with the straight groove. This includes: first moving the first inner groove cutter above the straight groove, then moving it downward until the first inner groove cutter moves to the outside of the groove opening at one end of the straight groove, and then moving the first inner groove cutter into the straight groove and performing turning processing on the first side groove.

[0011] Furthermore, in step three, the first inner groove cutter is moved into the straight groove and the first side groove is machined. Specifically, this includes: moving the first inner groove cutter into the straight groove until the first inner groove cutter abuts the bottom of the straight groove, then feeding the first inner groove cutter from top to bottom and machining until the first side groove is formed.

[0012] Furthermore, in step four, the first inner groove cutter moves along the preset second side groove processing path to process and remove the workpiece in the forward direction and obtain the second side groove communicating with the straight groove. Specifically, this includes: after the first inner groove cutter moves to the outside of the groove opening at the other end of the straight groove, the first inner groove cutter moves into the straight groove until the first inner groove cutter abuts the bottom of the straight groove, and then the first inner groove cutter is fed from top to bottom and turned until the second side groove is formed.

[0013] Furthermore, the first inner groove cutter includes a handle and a shank fixedly connected to the handle at one end. The other end of the shank is bent to form a cutter head, which is perpendicular to the shank. The other end of the cutter head forms a cutting surface, the width of which is equal to the width of the first side groove or the second side groove.

[0014] Furthermore, the width of the cutter head gradually increases from one end to the other.

[0015] Furthermore, the minimum distance from the cutting surface to the tool holder is greater than the size of the shoulder of the T-shaped annular groove, and the maximum distance from the cutting surface to the tool holder is less than the width of the straight groove.

[0016] Furthermore, the maximum dimension from the shank to the cutter head is greater than the groove depth of the T-shaped annular groove, and the minimum dimension from the shank to the cutter head is greater than the groove depth of the groove opening section of the T-shaped annular groove. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first side groove being machined according to the present invention; Figure 2 This is a schematic diagram illustrating the machining of the second side groove according to the present invention; Figure 3 For the present invention Figure 1 The enlarged view of the part is mainly used to show the structure of the first inner groove tool; Figure 4 This is a flowchart of the turning method for the end face T-shaped annular groove of the present invention; Figure 5 This is a structural diagram of the workpiece; Figure 6 This is a sectional view of the workpiece, mainly used to show the structure of the T-shaped annular groove; Figure 7 This is a schematic diagram of the machining of straight grooves; Figure 8 This is a schematic diagram of the machining of the first side groove in related technologies; Figure 9 This is a schematic diagram of machining the second side groove in related technologies.

[0018] The attached diagram lists the components represented by each number as follows: 1. Workpiece; 11. Straight groove; 12. First side groove; 13. Second side groove; 2. Straight groove cutter; 3. First inner groove cutter; 31. Tool holder; 32. Tool shank; 33. Tool head; 34. Cutting surface; 4. Second inner groove cutter. Detailed Implementation

[0019] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] like Figure 5 and Figure 6 The T-shaped annular groove on the end face of workpiece 1 is composed of three parts: a straight groove 11, a first side groove 12, and a second side groove 13, all of which are annular groove structures.

[0021] like Figures 7-9 When machining the T-shaped ring groove on the end face on a CNC lathe, the traditional machining method is to first use a straight grooving cutter 2 to machine the straight groove 11 of the T-shaped ring groove on the end face, and then use two inner grooving cutters to machine the first side groove 12 and the second side groove 13 in turn.

[0022] That is, such as Figure 7 First, use a straight groove cutter 2 to machine a straight groove 11 from right to left in the direction shown in the figure, and then retract the cutter. Figure 7 In the middle, V c B represents the rotation direction of workpiece 1, B represents the feed path of straight groove tool 2 when machining straight groove 11, and f represents the tool feed direction.

[0023] After that, as Figure 8 The first side groove 12 is machined by the first inner groove tool 3 and then retracted. The feed direction of the first inner groove tool 3 is from top to bottom, and the machine tool spindle is set to rotate forward. This machining method is forward machining, and at this time the tool feeds towards the direction of the operator. Figure 8 In the middle, V c C1 indicates the rotation direction of workpiece 1, C1 indicates the feed path of the first inner groove tool 3 when machining the first side groove 12, and f indicates the tool feed direction.

[0024] After that, as Figure 9 The second inner groove tool 4 is used to process the second side groove 13 and then retracts. The feed direction of the second inner groove tool 4 is from bottom to top, and the machine tool spindle is also set to rotate in the forward direction. This processing method is reverse processing, and at this time the tool feeds in the direction away from the operator. Figure 8 In the middle, V cC1 indicates the rotation direction of workpiece 1, C2 indicates the feed path of the second inner groove tool 4 when machining the second side groove 13, and f indicates the tool feed direction.

[0025] The traditional machining method for end-face T-shaped ring grooves has the following problems: From the perspective of production cost, the traditional machining of end-face T-shaped ring grooves requires three tools: a straight groove cutter 2, a first inner groove cutter 3, and a second inner groove cutter 4, making the machining cost relatively high; from the perspective of production efficiency, the traditional machining method requires tool setting three times, resulting in relatively low production efficiency compared to the traditional machining method; from the perspective of machining accuracy, due to the tool setting error of the first inner groove cutter 3 and the second inner groove cutter 4, there are dimensional errors in the first side groove 12 and the second side groove 13, leading to asymmetry of the two side grooves and affecting the assembly of the end-face T-shaped ring groove; from the perspective of lead screw backlash, the first side groove 12 is machined in the forward direction, while the second side groove 13 is machined in the reverse direction, and the backlash of the lead screw will inevitably affect the symmetry and dimensional accuracy of the two side grooves of the end-face T-shaped ring groove.

[0026] To address the above issues, this application provides a turning method for an end face T-shaped annular groove, as detailed below.

[0027] like Figures 1-4 ,as well as Figure 7 A method for turning a T-shaped annular groove on an end face includes the following steps: Step 1: Provide workpiece 1 and clamp workpiece 1 on the machine tool spindle; Step 2: Provide the straight groove cutter 2 and clamp it on the machine tool tool post. Turn on the machine tool and make the workpiece 1 rotate with the machine tool spindle. Move the straight groove cutter 2 along the preset straight groove machining path to cut off the workpiece 1 and obtain the straight groove 11. Exit and remove the straight groove cutter 2. Step 3: Provide the first inner groove tool 3 and clamp it on the machine tool tool post. Turn on the machine tool and set the machine tool spindle to the first rotation direction (such as forward rotation or clockwise rotation). Make the workpiece 1 rotate with the machine tool spindle, and make the first inner groove tool 3 move along the preset first side groove processing path to process and remove the workpiece 1 and obtain the first side groove 12 that is connected to the straight groove 11. Exit the first inner groove tool 3 until it is located outside the groove opening at one end of the straight groove 11. Step 4: Set the machine tool spindle to the second rotation direction (e.g., reverse or counterclockwise rotation). The second rotation direction is opposite to the first rotation direction. Move the first inner groove cutter 3, which was withdrawn in Step 3, along the diameter direction of the workpiece 1 to the outside of the groove at the other end of the straight groove 11. Make the workpiece 1 rotate with the machine tool spindle, and make the first inner groove cutter 3 move along the preset second side groove processing path. Process and remove the workpiece 1 in the forward direction to obtain the second side groove 13 connected with the straight groove 11. The straight groove 11, the first side groove 12, and the second side groove 13 are interconnected to form a T-shaped annular groove. Withdraw the first inner groove cutter 3.

[0028] Using this machining method, the first side groove 12 and the second side groove 13 of the end face T-shaped ring groove are both machined in a double forward direction. Compared with the traditional forward and reverse machining methods, the number of tools is reduced from three to two, and the forward and reverse tool movement is changed to double forward tool movement. These changes in machining methods can effectively improve the machining accuracy and production efficiency of the end face T-shaped ring groove, as well as reduce production costs. It can also solve the problem of reduced machining accuracy of parts due to the backlash of the machine tool lead screw.

[0029] In step four: the first inner groove cutter 3 that was withdrawn in step three is moved along the diameter direction of the workpiece 1 to the outside of the groove at the other end of the straight groove 11. At this time, the backlash of the lead screw can be eliminated, and there is no need to change the tool. The first inner groove cutter 3 can be used for continuous processing.

[0030] In this embodiment, as Figure 7 , Figure 7 In the middle, V c B represents the rotation direction of workpiece 1, B represents the feed path of straight groove tool 2 when machining straight groove 11, and f represents the tool feed direction.

[0031] In step two, the straight groove cutter 2 is moved along a preset straight groove machining path to remove the workpiece 1 and obtain the straight groove 11. This includes adjusting the straight groove cutter 2 so that it faces the preset T-shaped annular groove machining position on the workpiece 1, and then performing turning machining on the straight groove 11. The preset T-shaped annular groove machining position refers to the location along the machining path of the T-shaped annular groove.

[0032] The turning process of the straight groove 11 specifically includes: moving the machine tool tool post and moving the straight groove tool 2 toward the workpiece 1 along the thickness direction of the workpiece 1, turning the workpiece 1 until a straight groove 11 with the same depth as the preset T-shaped annular groove is obtained.

[0033] After the straight flute 2 is adjusted into position, the machine tool tool post is moved so that the straight flute 2 moves toward the workpiece 1 along the thickness direction of the workpiece 1 to complete the turning operation.

[0034] In this embodiment, as Figure 1 , Figure 1 In the middle, V c A1 indicates the rotation direction of workpiece 1, A1 indicates the feed path of the first inner groove tool 3 when machining the first side groove 12, and f indicates the tool feed direction.

[0035] In step three, the first inner groove cutter 3 is moved along the preset first side groove processing path to process and remove the workpiece 1 in the forward direction and obtain the first side groove 12 connected to the straight groove 11. This includes: first moving the first inner groove cutter 3 above the straight groove 11, and then moving it downward until the first inner groove cutter 3 moves to the outside of the groove opening at one end of the straight groove 11, and then moving the first inner groove cutter 3 into the straight groove 11 and performing turning processing on the first side groove 12.

[0036] In step three, the first inner groove cutter 3 is moved into the straight groove 11 and the first side groove 12 is machined. Specifically, the first inner groove cutter 3 is moved into the straight groove 11 until the first inner groove cutter 3 abuts the bottom of the straight groove 11. Then the first inner groove cutter 3 is fed from top to bottom and machined until the first side groove 12 is formed.

[0037] First, the first inner groove cutter 3 is moved above the straight groove 11 and then moved downwards. At this time, the backlash of the lead screw can be eliminated.

[0038] In this embodiment, as Figure 2 , Figure 2 In the middle, V c A1 indicates the rotation direction of workpiece 1, A2 indicates the feed path of the first inner groove tool 3 when machining the second side groove 13, and f indicates the tool feed direction.

[0039] In step four, the first inner groove cutter 3 moves along the preset second side groove processing path to process and remove the workpiece 1 in the forward direction and obtain the second side groove 13 connected to the straight groove 11. Specifically, the first inner groove cutter 3 moves to the other end of the straight groove 11, which is shown as the upper end of the groove in the figure. Then, the first inner groove cutter 3 moves into the straight groove 11 until the first inner groove cutter 3 abuts the bottom of the straight groove 11. Then, the first inner groove cutter 3 is fed from top to bottom and turned until the second side groove 13 is formed.

[0040] By adopting the above processing method, the symmetry error of the grooves on both sides of the end face T-shaped ring groove can be reduced or eliminated; the turning accuracy of the end face T-shaped ring groove can be improved; the processing efficiency of the end face T-shaped ring groove can be improved; and the processing cost of the end face T-shaped groove can be reduced.

[0041] like Figure 1 and Figure 3 The first inner groove knife 3 includes a handle 31 and a knife bar 32 fixedly connected to the handle 31 at one end. The other end of the knife bar 32 is bent to form a knife head 33. The knife head 33 is perpendicular to the knife bar 32, and the other end of the knife head 33 forms a cutting surface 34. The width of the cutting surface 34 is equal to the width of the first side groove 12 or the second side groove 13.

[0042] In use, the tool holder 31 is mounted on the tool post of the lathe. When machining the first side groove 12 and the second side groove 13, the tool tip 33 is inserted into the straight groove 11, and then turning is performed through the cutting surface 34.

[0043] Among them, the width 'a' of the cutter head 33 gradually increases from one end to the other so that the cutter head 33 will not collide with the groove wall of the T-shaped annular groove during the cutting process. At the same time, a space is formed between the cutter head 33 and the groove wall of the T-shaped annular groove, which can accommodate the cutting material.

[0044] The minimum distance b1 from the cutting surface 34 to the tool holder 32 is greater than the size of the shoulder b2 of the T-shaped annular groove to ensure that the tool holder 32 will not collide with the workpiece 1 during the cutting process; the maximum distance b3 from the cutting surface 34 to the tool holder 32 is less than the groove width b4 of the straight groove 11 to ensure that the tool head 33 can be smoothly retracted after the cutting is completed.

[0045] The maximum dimension c1 from the tool holder 31 to the tool head 33 is greater than the groove depth c2 of the T-shaped annular groove, and the minimum dimension c3 from the tool holder 31 to the tool head 33 is greater than the groove depth c4 of the groove opening section of the T-shaped annular groove, so as to ensure that the tool holder 31 will not collide with the workpiece 1.

[0046] In summary, the principle of the turning method for the end face T-shaped annular groove of the present invention is as follows: First, such as Figure 7 As shown, the straight groove 11 of the T-shaped annular groove on the end face is machined using a straight groove cutter 2.

[0047] Next, the first inner grooving cutter 3 is used to machine the first side groove 12 in the forward direction, with the machine tool spindle set to forward rotation; the first inner grooving cutter 3 is first moved above the T-shaped annular groove on the end face, as shown in the image. Figure 1 Moving downwards further eliminates the backlash of the leadscrew. When the first inner groove cutter 3 moves to the position of the straight groove 11, it moves to the left through the straight groove 11. When it reaches the machining position, the first inner groove cutter 3 feeds downwards to machine the first side groove 12. Figure 1 As shown; when the first side groove 12 is finished, the first inner groove cutter 3 moves from bottom to top. When the cutter head of the first inner groove cutter 3 moves to the position of the straight groove 11, the first inner groove cutter 3 moves to the right and moves out of the groove.

[0048] Finally, the second side groove 13 is machined using the first inner grooving cutter 3 in the forward direction. The machine tool spindle must be set to reverse rotation; otherwise, the part cannot be machined. The first inner grooving cutter 3 moves upward from the position of the first side groove 12 until it reaches above the T-shaped annular groove on the end face. Figure 2 Moving downwards further eliminates the backlash of the leadscrew. When the first inner groove cutter 3 moves to the position of the straight groove 11, it moves to the left through the straight groove 11. When it reaches the machining position, the first inner groove cutter 3 feeds downwards to machine the second side groove 13. Figure 2 As shown; when the second side groove 13 is finished, the first inner groove cutter 3 moves from bottom to top. When the cutter head of the first inner groove cutter 3 moves to the position of the straight groove 11, the first inner groove cutter 3 moves to the right and moves out of the groove.

[0049] In the description of this invention, 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," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for turning a T-shaped annular groove on an end face, characterized in that, Includes the following steps: Step 1: Provide workpiece (1) and clamp workpiece (1) on the machine tool spindle; Step 2: Provide a straight groove cutter (2) and clamp the straight groove cutter (2) on the machine tool tool holder, turn on the machine tool, make the workpiece (1) rotate with the machine tool spindle, make the straight groove cutter (2) move along the preset straight groove processing path, cut off the workpiece (1) and obtain the straight groove (11), and remove and disassemble the straight groove cutter (2). Step 3: Provide the first inner groove cutter (3) and clamp the first inner groove cutter (3) on the machine tool tool holder, turn on the machine tool, set the machine tool spindle to the first rotation direction, so that the workpiece (1) rotates with the machine tool spindle, so that the first inner groove cutter (3) moves along the preset first side groove processing path, and processes and removes the workpiece (1) in the forward direction to obtain the first side groove (12) that communicates with the straight groove (11). Exit the first inner groove cutter (3) until the first inner groove cutter (3) is located outside the groove at one end of the straight groove (11); Step 4: Set the machine tool spindle to the second rotation direction, which is opposite to the first rotation direction. Move the first inner groove cutter (3) that was withdrawn in Step 3 along the diameter direction of the workpiece (1) to the outside of the groove at the other end of the straight groove (11), so that the workpiece (1) rotates with the machine tool spindle, and the first inner groove cutter (3) moves along the preset second side groove processing path, and processes and removes the workpiece (1) in the forward direction to obtain the second side groove (13) that is connected to the straight groove (11). The straight groove (11), the first side groove (12) and the second side groove (13) are connected to each other to form a T-shaped ring groove. Withdraw the first inner groove cutter (3).

2. The turning method for an end face T-shaped annular groove according to claim 1, characterized in that, In step two, the straight groove cutter (2) is moved along the preset straight groove machining path to cut off the workpiece (1) and obtain the straight groove (11), including: adjusting the straight groove cutter (2) to face the preset T-shaped ring groove machining position of the workpiece (1), and then performing the turning machining of the straight groove (11).

3. The turning method for an end face T-shaped annular groove according to claim 2, characterized in that, In step two, the turning of the straight groove (11) specifically includes: moving the machine tool tool holder and moving the straight groove tool (2) toward the workpiece (1) along the thickness direction of the workpiece (1), turning the workpiece (1) until a straight groove (11) with the same depth as the preset T-shaped ring groove is obtained.

4. The turning method for an end face T-shaped annular groove according to claim 1, characterized in that, In step three, the first inner groove cutter (3) is moved along the preset first side groove processing path to process and remove the workpiece (1) in the forward direction and obtain the first side groove (12) connected to the straight groove (11). This includes: first moving the first inner groove cutter (3) above the straight groove (11), then moving it down until the first inner groove cutter (3) moves to the outside of the groove at one end of the straight groove (11), and then moving the first inner groove cutter (3) into the straight groove (11) and performing turning processing on the first side groove (12).

5. The turning method for an end face T-shaped annular groove according to claim 4, characterized in that, In step three, the first inner groove cutter (3) is moved into the straight groove (11) and the first side groove (12) is machined. Specifically, the first inner groove cutter (3) is moved into the straight groove (11) until the first inner groove cutter (3) abuts the bottom of the straight groove (11). Then the first inner groove cutter (3) is fed from top to bottom and machined until the first side groove (12) is formed.

6. The turning method for an end face T-shaped annular groove according to claim 1, characterized in that, In step four, the first inner groove cutter (3) is moved along the preset second side groove processing path to process and remove the workpiece (1) in the forward direction and obtain the second side groove (13) connected to the straight groove (11). Specifically, the first inner groove cutter (3) moves to the outside of the groove opening at the other end of the straight groove (11), then moves into the straight groove (11) until the first inner groove cutter (3) abuts the bottom of the straight groove (11), and then feeds the first inner groove cutter (3) from top to bottom and performs turning until the second side groove (13) is formed.

7. A turning method for an end face T-shaped annular groove according to any one of claims 1-6, characterized in that, The first inner groove knife (3) includes a handle (31) and a knife bar (32) fixedly connected to the handle (31) at one end. The other end of the knife bar (32) is bent to form a knife head (33). The knife head (33) is perpendicular to the knife bar (32), and the other end of the knife head (33) forms a cutting surface (34). The width of the cutting surface (34) is equal to the width of the first side groove (12) or the second side groove (13).

8. The turning method for an end face T-shaped annular groove according to claim 7, characterized in that, The width of the cutter head (33) gradually increases from one end to the other.

9. The turning method for an end face T-shaped annular groove according to claim 7, characterized in that, The minimum distance from the cutting surface (34) to the tool holder (32) is greater than the size of the shoulder of the T-shaped annular groove, and the maximum distance from the cutting surface (34) to the tool holder (32) is less than the width of the straight groove (11).

10. The turning method for an end face T-shaped annular groove according to claim 7, characterized in that, The maximum dimension from the shank (31) to the cutter head (33) is greater than the groove depth of the T-shaped annular groove, and the minimum dimension from the shank (31) to the cutter head (33) is greater than the groove depth of the groove opening section of the T-shaped annular groove.

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