Adjustable double-edge turning tool bar tool and thread machining method

Abstract

The invention relates to the technical field of machining, in particular to an adjustable double-edge turning tool bar tool and a thread machining method.The adjustable double-edge turning tool bar tool comprises a tool bar, a main tool and a two-dimensional adjusting structure, and a main tool mounting groove and a first mounting groove are formed in the position, close to the head of the tool bar, of the tool bar; the main cutter is mounted in the main cutter mounting groove; the two-dimensional adjusting structure is arranged in the first mounting groove, an auxiliary cutter mounting seat is arranged on the two-dimensional adjusting structure, an auxiliary cutter mounting groove is formed in the auxiliary cutter mounting seat, an auxiliary cutter is mounted in the auxiliary cutter mounting groove, and the two-dimensional adjusting structure is used for adjusting the position of the auxiliary cutter in the length direction of the cutter bar and the position of the auxiliary cutter in the length direction perpendicular to the cutter bar. The problems of low production efficiency and large tool loss of shaft blank forging are solved; and the machining efficiency of single-end threads and double-end threads is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to an adjustable double-edged turning tool bar tool and a thread processing method. Background Art

[0002] In mechanical processing, turning processing and the application of turning tools are very common. In order to improve processing accuracy and production efficiency, 1. Use imported coated blades to improve blade durability, improve material removal efficiency, and improve production efficiency. 2. Reduce cutting depth, reduce line speed, reduce material removal rate, and reciprocate multiple times to improve tool durability and reduce the frequency of blade replacement.

[0003] When machining threads, screws or shaft parts with large material removal allowances, multiple tools are generally used to perform machining in two steps: rough turning and fine turning to improve the surface quality and accuracy. The rough turning step uses larger cutting parameters to increase the material removal rate and ensure machining efficiency, while the fine turning step uses smaller cutting amounts to ensure geometric and dimensional tolerances.

[0004] When processing double-threaded threads on a general lathe, a small carriage is used to separate the screw heads. Since the small carriage is used frequently, the screw rod and nut are worn and the gap cannot be adjusted or locked, so the error is large. CNC lathe processing requires the spindle to have the corresponding function of the rotary encoder, and the equipment cost is relatively high.

[0005] In summary, when machining shaft parts with large material removal margins, the time consumed by rough machining is often several times that consumed by fine machining. The reasons for this are mainly: the preparation time required for replacement and re-calibration of the blade after wear during rough machining; the low efficiency of rough machining material removal; if imported coated blades are used, the tool cost is high; in order to reduce the wear rate of the blade, a smaller cutting amount is adopted, but the number of reciprocating times will increase and the production time; using two tools for rough and fine machining will occupy too many tool positions on the old 4-position CNC lathe, resulting in insufficient tool positions; using multiple tools for rough and fine machining improves surface quality and accuracy, but the production time doubles; in double-head thread machining, it is difficult to accurately adjust the pitch of the two screw heads, and the use of CNC lathes requires the spindle to have the corresponding function of the rotary encoder, and the equipment cost is relatively high; that is, the tools in the prior art have the problem of low processing efficiency when machining shaft parts with large margins.

[0006] Therefore, it is necessary to provide an adjustable double-edged turning tool bar tool and a thread processing method to solve the above problems. Summary of the invention

[0007] The invention provides an adjustable double-edged turning tool bar tool and a thread processing method. An adjustable double-edged turning tool bar tool is designed and the auxiliary tool in the adjustable double-edged turning tool bar tool is adjusted to adjust the distance between the main tool and the auxiliary tool in the X direction and the cutting depth difference in the Y direction, so as to solve the problem of low processing efficiency of the tool in the prior art when processing shaft parts with large excess.

[0008] The present invention provides an adjustable double-edged turning tool bar tool and a thread processing method using the following technical solutions, including: The knife bar has a main knife installation groove and a first installation groove formed near the head; The main knife is installed in the main knife installation slot; And a two-dimensional adjustment structure is arranged in the first installation groove, on which a secondary knife mounting seat is arranged, the secondary knife mounting seat is provided with a secondary knife mounting groove, and the secondary knife is installed in the secondary knife mounting groove. The two-dimensional adjustment structure is used to adjust the position of the secondary knife along the length direction of the knife rod and in the length direction perpendicular to the knife rod.

[0009] Preferably, the two-dimensional adjustment structure comprises: A movable seat is slidably connected to the first mounting groove along the length direction of the knife rod, and a second mounting groove is formed on the movable seat, wherein the auxiliary knife mounting seat is slidably connected to the second mounting groove along the vertical direction of the length direction of the knife rod; A first adjusting screw rod, which passes through the head of the cutter bar along the length direction of the cutter bar and is rotatably connected to the movable seat, and the first adjusting screw rod is threadedly connected to the head of the cutter bar; And a second adjusting screw rod, which passes through the auxiliary tool mounting seat in a vertical direction along the length direction of the tool rod and is rotatably connected to the side wall of the second mounting groove, and the second adjusting screw rod is threadedly connected to the auxiliary tool mounting seat.

[0010] Preferably, it also includes: a locking pressure plate, one end of which is connected to the head of the knife rod through a locking screw, and the other end of which is pressed on the auxiliary knife mounting seat.

[0011] Preferably, a raised first guide rail is provided on the inner bottom surface of the first installation groove, and the first guide rail cooperates with a first guide groove provided on the bottom of the movable seat, wherein the first guide rail is parallel to the length direction of the knife rod.

[0012] Preferably, a raised second guide rail is provided on the inner bottom surface of the second mounting groove, and the second guide rail cooperates with a second guide groove provided at the bottom of the auxiliary tool mounting seat, wherein the second guide rail is perpendicular to the length direction of the tool rod.

[0013] Preferably, a first scale is provided on the movable seat in the length direction perpendicular to the tool rod, and a second scale is provided on the auxiliary tool mounting seat in the length direction perpendicular to the tool rod. When the 0 scale of the first scale coincides with the 0 scale of the second scale, the distance between the tips of the main knife and the auxiliary knife is 12 mm. A third scale is provided on the movable seat along the length direction of the tool rod, and a fourth scale is provided on the tool rod along its length direction. When the third scale coincides with the 0 scale of the fourth scale, the tips of the main knife and the auxiliary knife are flush.

[0014] A single-start thread processing method, comprising: Use an adjustable double-edged turning tool bar to process a single-start thread. The specific steps are as follows: Define the length direction of the tool bar as the Y direction, and the perpendicular direction of the tool bar length as the X direction; External roughing: The movable seat is adjusted to move in the Y direction by using the first adjusting screw rod, so as to adjust the cutting depth of the auxiliary tool in the Y direction to be greater than the cutting depth of the main tool, and the outer circle of the single-start thread is rough-machined; External finishing: Use the first adjusting screw to adjust the movable seat to move in the Y direction to adjust the cutting depth of the main tool and the auxiliary tool to be different. Under the condition of unchanged feed per revolution, use the different cutting depths of the main tool and the auxiliary tool to perform layered cutting on the outer circle of the single-start thread: Processing single start thread: According to the target pitch required by the single-start thread, the auxiliary tool mounting seat is adjusted to move in the X direction using the second adjusting screw, and the distance between the two tool tips of the main tool and the auxiliary tool is adjusted to a multiple of the target pitch; the movable seat is adjusted to move in the Y direction using the first adjusting screw, and the difference in cutting depth between the two tool tips of the main tool and the auxiliary tool in the Y direction is adjusted to between 0.1 and 0.2 mm, and the thread is processed on the finely machined outer cylindrical surface.

[0015] A double-start thread processing method, comprising: Use an adjustable double-edged turning tool bar to process a single-start thread. The specific steps are as follows: Define the length direction of the tool bar as the Y direction, and the perpendicular direction of the tool bar length as the X direction; External roughing: The movable seat is adjusted to move in the Y direction by using the first adjusting screw rod, so as to adjust the cutting depth of the auxiliary tool in the Y direction to be greater than the cutting depth of the main tool, and the outer circle of the double-start thread is rough-machined; External finishing: Use the first adjusting screw to adjust the movable seat to move in the Y direction to adjust the cutting depth of the main tool and the auxiliary tool to be different. Under the condition of unchanged feed per revolution, use the different cutting depths of the main tool and the auxiliary tool to perform layered cutting on the outer circle of the double-start thread: Processing double-start thread: The main tool and the auxiliary tool use standard blades of the same specification, and the main tool is installed in the main tool installation slot, and the auxiliary tool is installed in the auxiliary tool installation slot; the first adjusting screw is rotated to make the tool tips of the main tool and the auxiliary tool flush in the Y direction; the second adjusting screw is rotated to adjust the distance between the two tool tips of the main tool and the auxiliary tool in the X direction to a multiple of the pitch of the double thread, and the thread is processed on the finely machined outer cylindrical surface.

[0016] Preferably, when the thread pitch is a non-integer, the second adjusting screw is rotated and the distance between the tool tips of the primary tool and the secondary tool in the X direction is adjusted by comparing the first scale and the second scale.

[0017] Preferably, according to the double-start thread processing method according to the claim, it is characterized in that when the thread pitch is an integer, the distance between the two tool tips of the main tool and the auxiliary tool in the X direction is 12 mm.

[0018] The beneficial effects of the present invention are: 1. The adjustable double-edged turning tool bar tool of the present invention can adjust the position of the auxiliary tool in the X direction and the Y direction, which is convenient for controlling the cutting depth and the pitch. It can be processed and formed in one time in the rough machining and semi-finishing of shaft threaded parts, which doubles the material removal efficiency. In mass production, only the rough cutting blade is replaced when the tool is worn, which reduces the time for re-calibrating the tool after replacing the blade. The number of tool bars used is reduced, and the occupation of tool positions on the four-position equipment is reduced. It has high versatility and flexibility. It solves the problems of low production efficiency and large tool loss in forging shaft blanks.

[0019] 2. During finishing, adjust the position of the auxiliary tool of this tool in the Y direction so that the cutting depth of the main tool and the auxiliary tool tip is different, so as to achieve layered cutting with different cutting depths under the condition of unchanged feed per revolution, so as to improve the surface accuracy of the machined surface. The cutting amount borne by a single blade is also different, and the wear rate of the roughing blade and the finishing blade is different, which also greatly increases the service life of the blade. At the same time, it reduces the skill requirements for the operator, and makes full use of the existing ordinary low-priced tools to ensure product quality and improve production efficiency.

[0020] 3. In the processing of double-start threads of guide rods, the processing efficiency of double-start threads is effectively improved by 50%. To adjust the thread diameter tolerance, you only need to fine-tune the position of the auxiliary tool mounting seat, which is easy and efficient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of an adjustable double-edged turning tool bar tool of the present invention; Figure 2 The exploded view of an adjustable double-edged turning tool bar tool of the present invention.

[0023] In the figure: 1. knife bar; 2. auxiliary knife mounting seat; 3. movable seat; 4. locking pressure plate; 5. main knife; 6. auxiliary knife; 11. main knife mounting slot; 12. first mounting slot; 121. first guide rail; 21. auxiliary knife mounting slot; 22. second adjusting screw; 31. first adjusting screw; 41. locking screw. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] An embodiment of an adjustable double-edged turning tool bar tool and a thread processing method of the present invention is as follows Figure 1 and Figure 2 As shown, it includes: a tool bar 1, a main tool 5 and a two-dimensional adjustment structure, wherein the main body of the tool bar 1 of this embodiment adopts a rectangular straight handle structure, which is suitable for workpiece rotation processing equipment such as ordinary lathes, CNC lathes, and vertical lathes. A main tool mounting groove 11 and a first mounting groove 12 are provided near the head of the tool bar 1; the main tool 5 is installed in the main tool mounting groove 11; the two-dimensional adjustment structure is arranged in the first mounting groove 12, and a secondary tool mounting seat 2 is provided on the two-dimensional adjustment structure, and a secondary tool mounting groove 21 is provided on the secondary tool mounting seat 2, and a secondary tool 6 is installed in the secondary tool mounting groove 21. The two-dimensional adjustment structure is used to adjust the position of the secondary tool 6 along the length direction of the tool bar 1 and in the length direction perpendicular to the tool bar 1, so as to adjust the distance between the main tool 5 and the secondary tool 5 in the length direction perpendicular to the tool bar 1, and adjust the cutting depth value of the secondary tool 5 along the length direction of the tool bar 1.

[0026] The two-dimensional adjustment structure in this embodiment includes: a movable seat 3, a first adjusting screw 31 and a second adjusting screw 22; the movable seat 3 is slidably connected to the first mounting groove 12 along the length direction of the tool rod 1, and a second mounting groove is provided on the movable seat 3, wherein the auxiliary knife mounting seat 2 is slidably connected to the second mounting groove along the vertical direction of the length direction of the tool rod 1; the first adjusting screw 31 passes through the head of the tool rod 1 along the length direction of the tool rod 1 and is rotatably connected to the movable seat 3, and the first adjusting screw 31 is threadedly connected to the head of the tool rod 1, and the movable seat 3 is adjusted in the tool rod 1 through the first adjusting screw 31. The second adjusting screw 22 is threadably connected to the auxiliary tool mounting seat 2, and the auxiliary tool mounting seat 2 is precisely positioned in the length direction of the tool rod 1, thereby realizing the position of the auxiliary tool mounting seat 2 on the movable seat 3, that is, realizing the position adjustment of the auxiliary tool 6, so as to adjust the cutting depth value of the auxiliary tool 6 in the length direction of the tool rod 1; the second adjusting screw 22 passes through the auxiliary tool mounting seat 2 in the vertical direction of the length direction of the tool rod 1 and is rotatably connected to the side wall of the second mounting groove, and the second adjusting screw 22 is threadably connected to the auxiliary tool mounting seat 2, and the second adjusting screw 22 is rotated to adjust the precise position of the auxiliary tool mounting seat 2 in the vertical length direction of the tool rod 1, thereby realizing the distance adjustment between the tips of the main tool 5 and the auxiliary tool 6.

[0027] The first installation groove 12 has a raised first guide rail 121 on its inner bottom surface, and the first guide rail 121 cooperates with the first guide groove on the bottom of the movable seat 3, wherein the first guide rail 121 is parallel to the length direction of the knife bar 1. The second installation groove has a raised second guide rail on its inner bottom surface, and the second guide rail cooperates with the second guide groove on the bottom of the auxiliary knife mounting seat 2, wherein the second guide rail is perpendicular to the length direction of the knife bar 1.

[0028] In this embodiment, in order to accurately adjust the distance between the two cutting edges of the main knife 5 and the auxiliary knife 6 in the direction perpendicular to the length of the knife rod 1, a first scale is set on the movable seat 3 in the direction perpendicular to the length of the knife rod 1, and a second scale is set on the auxiliary knife mounting seat 2 in the direction perpendicular to the length of the knife rod 1. When the 0 scale of the first scale and the second scale coincide, the distance between the cutting edges of the main knife 5 and the auxiliary knife 6 is 12 mm; in order to accurately adjust the cutting depth value of the auxiliary knife along the length of the knife rod 1, in this embodiment, a third scale is set on the movable seat 3 along the length of the knife rod 1, and a fourth scale is set on the knife rod 1 along its length. When the third scale coincides with the 0 scale of the fourth scale, the cutting edges of the main knife 5 and the auxiliary knife 6 are flush.

[0029] Specifically, it also includes: a locking pressure plate 4, one end of which is connected to the head of the tool rod 1 through a locking screw 41, and the other end of which is pressed on the auxiliary tool mounting seat 2.

[0030] An embodiment of a single-start thread processing method of the present invention comprises: The adjustable double-edged turning tool bar tool of the present invention is used to process a single-start thread, and the specific steps are as follows: Step 1: Define the length direction of the tool bar 1 as the Y direction, and the length direction perpendicular to the tool bar 1 as the X direction.

[0031] Step 2, outer circle rough machining: rotate the first adjusting screw 31 so that the first adjusting screw 31 is screwed into the threaded hole at the head of the tool rod 1, thereby driving the movable seat 3 to move in the Y direction, so that the cutting depth of the auxiliary tool 6 in the Y direction is greater than the cutting depth of the main tool 5, and the outer circle of the single-start thread is rough-machined. It should be noted that this step realizes one-time feed, the main tool 5 on the left side is used to peel the black skin of the bar material, and the auxiliary tool 6 on the right side ensures the cutting size. When replacing the blade, only the rough cutting blade needs to be replaced, thereby greatly improving the rough machining material removal efficiency.

[0032] Step 3, outer circle finishing: Use the first adjusting screw 31 to adjust the movable seat 3 to move in the Y direction to adjust the different cutting depths of the tool tips of the main tool 5 and the auxiliary tool 6. Under the condition of unchanged feed per revolution, the outer circle of the single-start thread is cut in layers using the different cutting depths of the main tool 5 and the auxiliary tool 6. It should be noted that layered cutting is used to improve the surface accuracy of the machined surface, and the cutting amount borne by each blade in the main tool 5 and the auxiliary tool 6 is also different. The wear rate of the main tool 5 as a roughing blade and the wear rate of the auxiliary tool 6 as a finishing blade are different, thereby ensuring the service life of the blade.

[0033] Step 4: Processing single-start thread: According to the target pitch required by the single-start thread, the second adjusting screw 22 is used to adjust the movement of the auxiliary tool mounting seat 2 in the X direction, and the distance between the two tool tips of the main tool 5 and the auxiliary tool 6 is adjusted to a multiple of the target pitch; the first adjusting screw 31 is used to adjust the movement of the movable seat 3 in the Y direction, and the difference in cutting depth between the two tool tips of the main tool 5 and the auxiliary tool 6 in the Y direction is adjusted to between 0.1 and 0.2 mm. In this embodiment, 0.2 mm is selected. The main tool 5 is used to remove the excess, and the auxiliary tool 6 is used to ensure the accuracy and brightness of the thread, and the thread is processed on the finely machined outer cylindrical surface.

[0034] An embodiment of a double-start thread processing method of the present invention comprises: The adjustable double-edged turning tool bar tool of the present invention is used to process double-start threads, and the specific steps are as follows: Step 1: Define the length direction of the tool bar 1 as the Y direction, and the length direction perpendicular to the tool bar 1 as the X direction.

[0035] Step 2, outer circle rough machining: rotate the first adjusting screw 31 so that the first adjusting screw 31 is screwed into the threaded hole at the head of the tool rod 1, thereby driving the movable seat 3 to move in the Y direction, so that the cutting depth of the auxiliary tool 6 in the Y direction is greater than the cutting depth of the main tool 5, and the outer circle of the single-start thread is rough-machined. It should be noted that this step realizes one-time feed, the main tool 5 on the left side is used to peel the black skin of the bar material, and the auxiliary tool 6 on the right side ensures the cutting size. When replacing the blade, only the rough cutting blade needs to be replaced, thereby greatly improving the rough machining material removal efficiency.

[0036] Step 3, outer circle finishing: Use the first adjusting screw 31 to adjust the movable seat 3 to move in the Y direction to adjust the different cutting depths of the tool tips of the main tool 5 and the auxiliary tool 6. Under the condition of unchanged feed per revolution, the outer circle of the single-start thread is cut in layers using the different cutting depths of the main tool 5 and the auxiliary tool 6. It should be noted that layered cutting is used to improve the surface accuracy of the machined surface, and the cutting amount borne by each blade in the main tool 5 and the auxiliary tool 6 is also different. The wear rate of the main tool 5 as a roughing blade and the wear rate of the auxiliary tool 6 as a finishing blade are different, thereby ensuring the service life of the blade.

[0037] Step 4: Processing double-start threads: The main knife 5 and the auxiliary knife 6 use standard blades of the same specification, and the main knife 5 is installed in the main knife installation groove 11, and the auxiliary knife 6 is installed in the auxiliary knife installation groove 21; the first adjusting screw 31 is rotated to make the tips of the main knife 5 and the auxiliary knife 6 flush in the Y direction; the second adjusting screw 22 is rotated to adjust the distance between the two tips of the main knife 5 and the auxiliary knife 6 in the X direction to a multiple of the pitch of the double thread. In this embodiment, when the thread pitch is an integer, the distance between the two tips of the main knife 5 and the auxiliary knife 6 in the X direction is 12 mm, that is, it is only necessary to rotate the second adjusting screw 22 so that the first scale on the movable seat 3 and the 0 scale of the second scale on the auxiliary knife mounting seat 2 coincide, so that the distance between the two tips of the main knife 5 and the auxiliary knife 6 in the X direction is 12 mm, and the thread is processed on the finely machined outer cylindrical surface. It should be noted that the fixed distance value of the two tool tips in the X direction is 12 mm, which is a multiple of most pitches, such as pitch P (1, 2, 3, 4, 6, the pitches of the two tool tips are integer multiples of the pitch P, and the two tool tips can overlap on a spiral line). Therefore, for the above pitch threads, the main tool 5 and the auxiliary tool 6 each process one thread of the double-start thread, and the depths of the two threads are consistent. Compared with the traditional double-start thread processing, the traditional double-start thread processes one thread at a time, and each time the processing is completed, the pitch needs to be readjusted. The present invention can process two threads at a time, and there is no need to adjust the pitch. Therefore, this embodiment achieves double the material removal efficiency of the double-start thread.

[0038] Specifically, when the thread pitch is non-integer, the second adjusting screw is rotated and the distance between the tips of the primary tool and the secondary tool in the X direction is adjusted by comparing the first scale and the second scale. Column 1: The thread pitch P is 1.25, and when the first scale and the second scale are both "0", the pitch is 12 mm, 1.25×10=12.5 mm, which is 0.5 mm different from 12 mm, so the secondary tool mounting seat 2 is adjusted by 0.5 mm in the X direction by rotating the second adjusting screw 22. Other pitches can also be determined by quickly checking the following table 1.

[0039] Table 1

[0040] In addition, it should be noted that: 1. For double-start threads with a lead of >6mm, the first step is to determine the required adjustment value from Table 1; use the value plus or minus a pitch P to adjust the position of the auxiliary tool mounting seat 2; rotate the first adjustment screw 31 to adjust the movable seat 3, and ensure that the two tool tips of the main tool 5 and the auxiliary tool 6 are on the same horizontal line by comparing the first scale and the second scale, and adjust the second adjustment screw 22 to adjust the auxiliary tool mounting seat 2 to ensure that the spacing between the main tool 5 and the auxiliary tool 6 meets the distance of the auxiliary tool mounting seat 2 moving in the X direction in Table 1, so that the double-start thread processing can be accurately divided, and two spiral lines can be processed at the same time in one feed, thereby improving production efficiency. 2. In this embodiment, for double-start threads with a lead of >12mm, a group of replaceable auxiliary tool mounting seats 2 are made, and the replacement of the auxiliary tool mounting seat 2 can be achieved by simply replacing the locking pressure plate 4, thereby achieving accurate division of the double-start thread processing, and two spiral lines can be processed at the same time in one feed, thereby improving production efficiency. 3. For higher tool tip distance precision adjustment: The scale on the invention is consistent with the principle of the main and auxiliary scales on the vernier caliper, which can achieve a scale accuracy of 0.05 mm. If more precise adjustment accuracy of the displacement of the two tool tips is required, a dial indicator can be used to adjust with the equipment's own accuracy. Accurate X and Y direction displacement adjustment can be achieved by moving the equipment and reading the digital reading on the dial indicator.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable double-edged turning tool bar tool, characterized in that: include: A knife bar (1) having a main knife mounting groove (11) and a first mounting groove (12) formed near the head thereof; A main knife (5) is installed in a main knife installation slot (11); and a two-dimensional adjustment structure, which is arranged in the first installation groove (12), on which an auxiliary knife installation seat (2) is arranged, the auxiliary knife installation seat (2) is provided with an auxiliary knife installation groove (21), and an auxiliary knife (6) is installed in the auxiliary knife installation groove (21), and the two-dimensional adjustment structure is used to adjust the position of the auxiliary knife (6) along the length direction of the knife rod (1) and in the length direction perpendicular to the knife rod (1).

2. The adjustable double-edged turning tool bar tool according to claim 1, characterized in that: The two-dimensional adjustment structure includes: A movable seat (3) is slidably connected to the first mounting groove (12) along the length direction of the knife rod (1), and a second mounting groove is formed on the movable seat, wherein the auxiliary knife mounting seat (2) is slidably connected to the second mounting groove along a direction perpendicular to the length direction of the knife rod (1); A first adjusting screw (31) passes through the head of the knife rod (1) along the length direction of the knife rod (1) and is rotatably connected to the movable seat (3), and the first adjusting screw (31) is threadedly connected to the head of the knife rod (1); And a second adjusting screw (22), which passes through the auxiliary knife mounting seat (2) along the vertical direction of the length of the knife rod (1) and is rotatably connected to the side wall of the second mounting groove, and the second adjusting screw (22) is threadedly connected to the auxiliary knife mounting seat (2).

3. The adjustable double-edged turning tool bar tool according to claim 1, characterized in that: Also includes: The locking pressure plate (4) has one end connected to the head of the knife bar (1) through a locking screw (41), and the other end pressed on the auxiliary knife mounting seat (2).

4. The adjustable double-edged turning tool bar tool according to claim 2, characterized in that: A protruding first guide rail (121) is provided on the inner bottom surface of the first installation groove (12), and the first guide rail (121) cooperates with a first guide groove provided on the bottom of the movable seat (3), wherein the first guide rail (121) is parallel to the length direction of the knife rod (1).

5. The adjustable double-edged turning tool bar tool according to claim 1, characterized in that: A raised second guide rail is provided on the inner bottom surface of the second installation groove, and the second guide rail cooperates with a second guide groove provided on the bottom of the auxiliary tool mounting seat (2), wherein the second guide rail is perpendicular to the length direction of the tool rod (1).

6. The adjustable double-edged turning tool bar tool according to claim 2, characterized in that: A first scale is provided on the movable seat (3) in a direction perpendicular to the length of the knife rod (1), and a second scale is provided on the auxiliary knife mounting seat (2) in a direction perpendicular to the length of the knife rod (1). When the 0 scale of the first scale and the second scale coincide, the distance between the tips of the main knife (5) and the auxiliary knife (6) is 12 mm. A third scale is provided on the movable seat (3) along the length of the knife rod (1), and a fourth scale is provided on the knife rod (1) along its length. When the third scale coincides with the 0 scale of the fourth scale, the tips of the main knife (5) and the auxiliary knife (6) are flush.

7. A method for processing a single-start thread, characterized in that: include: The single-start thread is processed by using the adjustable double-edged turning tool bar tool as described in any one of claims 1 to 6, and the specific steps are as follows: Define the length direction of the tool bar as the Y direction, and the perpendicular direction of the tool bar length as the X direction; External roughing: The movable seat is adjusted to move in the Y direction by using the first adjusting screw rod, so as to adjust the cutting depth of the auxiliary tool in the Y direction to be greater than the cutting depth of the main tool, and the outer circle of the single-start thread is rough-machined; External finishing: The movable seat is adjusted to move in the Y direction by using the first adjusting screw rod to adjust the cutting depths of the main tool and the auxiliary tool to be different. Under the condition that the feed per revolution remains unchanged, the outer circle of the single-start thread is finished by layered cutting by using the different cutting depths of the main tool and the auxiliary tool. Processing single start thread: According to the target pitch required by the single-start thread, the auxiliary tool mounting seat is adjusted to move in the X direction using the second adjusting screw, and the distance between the two tool tips of the main tool and the auxiliary tool is adjusted to a multiple of the target pitch; the movable seat is adjusted to move in the Y direction using the first adjusting screw, and the difference in cutting depth between the two tool tips of the main tool and the auxiliary tool in the Y direction is adjusted to between 0.1 and 0.2 mm, and the thread is processed on the finely machined outer cylindrical surface.

8. A method for processing double-start threads, characterized in that: include: The single-start thread is processed by using the adjustable double-edged turning tool bar tool as described in any one of claims 1 to 6, and the specific steps are as follows: Define the length direction of the tool bar as the Y direction, and the perpendicular direction of the tool bar length as the X direction; External roughing: The movable seat is adjusted to move in the Y direction by using the first adjusting screw rod, so as to adjust the cutting depth of the auxiliary tool in the Y direction to be greater than the cutting depth of the main tool, and the outer circle of the double-start thread is rough-machined; External finishing: Use the first adjusting screw to adjust the movable seat to move in the Y direction to adjust the cutting depth of the main tool and the auxiliary tool to be different. Under the condition of unchanged feed per revolution, use the different cutting depths of the main tool and the auxiliary tool to perform layered cutting on the outer circle of the double-start thread: Processing double-start thread: The main tool and the auxiliary tool use standard blades of the same specification, and the main tool is installed in the main tool installation slot, and the auxiliary tool is installed in the auxiliary tool installation slot; the first adjusting screw is rotated to make the tool tips of the main tool and the auxiliary tool flush in the Y direction; the second adjusting screw is rotated to adjust the distance between the two tool tips of the main tool and the auxiliary tool in the X direction to a multiple of the pitch of the double thread, and the thread is processed on the finely machined outer cylindrical surface.

9. The method for processing double-start threads according to claim 8, characterized in that: When the thread pitch is not an integer, the second adjusting screw is rotated and the distance between the tool tips of the main tool and the auxiliary tool in the X direction is adjusted according to the comparison between the first scale and the second scale.

10. The method for processing double-start threads according to claim 8, characterized in that: When the thread pitch is an integer, the distance between the two tool tips of the main tool and the auxiliary tool in the X direction is 12 mm.

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