Threading machine cutter group structure for special buckle machining

Abstract

The utility model belongs to the field of special buckle processing devices, and particularly relates to a threading machine cutter group structure for special buckle processing, which comprises a support frame, a third cutter group unit, a second cutter group unit and a first cutter group unit, the third cutter group unit comprises a rotary cutter tower, a hollow third cutter bar, a third cutter head, a third cutter group and a third driving mechanism, the third cutter set comprises a sealing cutter and a screwer, the second cutter set unit comprises a hollow second cutter bar, a second cutter head, a waste scraping cutter and a second driving mechanism, and the first cutter set unit comprises a hollow first cutter bar, a first cutter head, an inner circular cutter and a first driving mechanism. According to the cutter group structure of the threading machine, the distribution of the cutters and the direction of the cutter point are changed, so that the rest amount is controllable, the first-pass yield can be improved by 5%, the production efficiency can be improved by 15%, the production variety is expanded, and the single TPCQ is expanded to special buckle types such as TPNF, TPG2, TPG4 and TPQR.

Description

Technical Field

[0001] This utility model belongs to the field of special thread processing devices, and in particular relates to a thread turning machine tool assembly structure for special thread processing. Background Technology

[0002] Existing machine tools have long adhered to foreign design concepts and tool holder layouts, primarily processing API products. With the increasing demand for special threads in recent years, the use of a rotating turret and tool holder has enabled the production of relatively low-end TPCQ special threads, allowing for sustained production. The existing insert layout (such as...) Figure 1 (As shown) For many years, the equipment has used a random tool holder, with the roughing cutter 8 and threading cutter 9 on the second tool head 10. This design was originally intended for LC and BC threads in API products. However, the original design left a fixed cutting allowance for the threading cutter 9 on the roughing cutter 8 of the second tool head 10, and the size of the allowance could not be controlled. The third tool head 4 is equipped with a finishing threading cutter 5, and the threading cutter 9 on the second tool head 10 and the finishing threading cutter 5 on the third tool head 4 are adjusted so that the Z-axis difference between the forming teeth of the two cutters is one tooth pitch, thus achieving thread machining in a two-piece roughing and finishing manner. However, this leaves a large machining allowance for the threading cutter 9 after the roughing cutter 8 has been used, which can easily cause damage to the threading cutter 9.

[0003] To address these issues, existing technologies can increase the machine tool spindle speed or increase the cutting depth to reduce machining frequency. However, this leads to a vicious cycle of spindle bearing wear and frequent tool breakage and changes, severely impacting the first-pass yield and efficiency. Furthermore, the original design is limited to machining TPCQ thick-walled sleeves and positive angle threads, which is a significant limitation and hinders maximizing machine tool capabilities. This cannot meet the production needs of negative angle special threads such as TPNF, TPG2, TPG4, and TPQR.

[0004] Therefore, in order to meet the needs of current production, the existing tool assembly structure needs to be improved. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a tool set structure for a thread turning machine for special threading. By changing the tool distribution and tool tip orientation, the remaining amount can be controlled, thereby improving the first-pass yield and efficiency.

[0006] The technical solution adopted by this utility model to solve the technical problem is:

[0007] A tool set structure for a thread-cutting machine used for special threading processes includes: a support frame, a third tool set unit, a second tool set unit, and a first tool set unit. The support frame includes a rotating turret support frame and a fixed support frame arranged perpendicular to the axial direction, and a first tool bar support frame arranged along the axial direction. The rotating turret support frame, the fixed support frame, and the first tool bar support frame are mounted on a machine tool. The third tool set unit includes a rotating turret, a hollow third tool bar, a third tool head, a third tool set, and a third drive mechanism. The third tool set includes a sealing tool and a threading tool. One end of the third tool bar is connected to the rotating turret via a third fixed connector. The rotating turret is fixed to the rotating turret support frame. The third tool head is fixed to the other end of the third tool bar. The third drive mechanism is integrated into the internal cavity of the third tool bar and is used to drive the third tool set to move axially and radially. A sealing tool position and a threading tool position are provided at the end of the third tool head, corresponding to the installation of the sealing tool and the threading tool, respectively. The radial height of the threading cutter is higher than that of the sealing cutter, and the horizontal distance between the tip of the sealing cutter and the tip of the threading cutter is greater than the nose length of the special fastener product; the second cutter unit includes a hollow second cutter bar, a second cutter head, a roughing cutter, and a second drive mechanism. One end of the second cutter bar is fixed to a fixed support frame through a second fixed connector, and the other end is connected to the second cutter head. A roughing cutter position is provided at the end of the second cutter head for corresponding installation of the roughing cutter. The second drive mechanism is integrated into the internal cavity of the second cutter bar and is used to drive the second cutter group to move axially and radially; the first cutter unit includes a hollow first cutter bar, a first cutter head, an inner round cutter, and a first drive mechanism. One end of the first cutter bar is fixed to a first cutter bar support frame through a first fixed connector, and the other end is connected to the first cutter head. An inner round cutter position is provided at the end of the first cutter head for corresponding installation of the inner round cutter. The first drive mechanism is integrated into the internal cavity of the first cutter bar and is used to drive the first cutter group to move axially.

[0008] Furthermore, the machining allowance between the roughing blade and the threading blade is controlled within the range of 0.2-0.3mm.

[0009] Furthermore, the radial height difference between the tip of the threading cutter and the tip of the sealing cutter is 2-3 mm.

[0010] Furthermore, the horizontal distance between the tip of the threading cutter and the tip of the sealing cutter is 10-20 mm.

[0011] Furthermore, the threading tool is a single-tooth or two-tooth blade.

[0012] Furthermore, the inner circular cutter is a square blade.

[0013] Furthermore, the sealing blade is a rhomboid sealing blade.

[0014] Furthermore, the first, second, and third drive mechanisms are coordinated and controlled by the control system to achieve sequential processing of multiple tool groups.

[0015] The advantages and positive effects of this utility model are:

[0016] 1. In this utility model, the first, second, and third cutting heads are all fixed. The sealing cutter and threading cutter are installed on the third cutting head, which reduces the cutting head rotation time and the cost of repairing and restoring the cutting head rotation function. It also reduces the time spent changing tool positions during processing. After threading, the system replaces the tool compensation and directly processes the sealing part, improving overall production efficiency by 15%. The roughing cutter is independently installed on the second cutting head and uses its own wear compensation. The cutting allowance left for the threading cutter is controllable, avoiding the mutual interference problems of segmented tool compensation and segmented processing in programming.

[0017] 2. This utility model machine makes the remaining quantity controllable by changing the distribution of the cutting tools and the orientation of the cutting tips, which can improve the first pass rate by 5% and expand the product range from the single TPCQ to special buckle types such as TPNF, TPG2, TPG4, and TPQR. Attached Figure Description

[0018] Figure 1 Background: A schematic diagram of the tool assembly structure of a thread-cutting machine;

[0019] Figure 2 This is a schematic diagram of the tool assembly structure of the thread-cutting machine of this utility model.

[0020] The attached diagram is labeled as follows: 1-Rotating turret, 2-Third fixed connector, 3-Third tool holder, 4-Third tool head, 5-Finishing thread cutter, 6-Sealing tool, 7-Steel pipe, 8-Roughing tool, 9-Threading tool, 10-Second tool head, 11-Second tool holder, 12-Second fixed connector, 13-Fixed support frame, 14-Internal turning tool, 15-First tool head, 16-First tool holder, 17-First fixed connector, 18-First tool holder support frame, 19-Rotating turret support frame. Detailed Implementation

[0021] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not limiting, and should not be used to limit the protection scope of the present invention.

[0022] A schematic diagram of a thread-cutting machine tool assembly for special thread processing is shown below. Figure 2 As shown, the machine includes a support frame, a third cutter group unit, a second cutter group unit, and a first cutter group unit. This cutter group structure of the thread cutting machine can be used for high-efficiency processing of special threads.

[0023] The support frame is used to support the tool assembly structure, including a rotating turret support frame 19 and a fixed support frame 13 arranged perpendicular to the axis, and a first tool bar support frame 18 arranged along the axis. The rotating turret support frame 19, the fixed support frame 13, and the first tool bar support frame 18 are mounted on the machine tool.

[0024] The first tool assembly unit includes a hollow first tool holder 16, a first tool head 15, an internal rounding cutter 14, and a first drive mechanism. One end of the first tool holder 16 is connected to the first tool holder support frame 18 via a first fixed connector 17, and the other end is connected to the first tool head 15. An internal rounding cutter 14 is positioned at the end of the first tool head 15 and is correspondingly installed thereon. The first drive mechanism is integrated into the internal cavity of the first tool holder 16 (not shown in the figure) and is used to drive the axial movement of the first tool assembly. The internal rounding cutter 14, which is a square insert, is mounted on the first tool head 15. It performs internal chamfering and end face cutting according to the machining program, and after machining, it returns to the working origin (and does not participate in other machining processes).

[0025] The second tool set unit includes a hollow second tool holder 11, a second tool head 10, a roughing tool 8, and a second drive mechanism. One end of the second tool holder 11 is fixed to the fixed support frame 13 via a second fixed connector 12, and the other end is connected to the second tool head 10. The second drive mechanism is integrated into the internal cavity of the second tool holder 11 (not shown in the figure) and is used to drive the second tool set to move axially and radially (axial and radial directions are perpendicular). A roughing tool 8 position is provided at the end of the second tool head 10, and a roughing tool 8 is installed accordingly. The roughing tool 8 is a special roughing tool 8 piece, used to remove excess material from the surface of the workpiece and perform rough cutting on the outer surface to prepare for subsequent finishing. The roughing tool 8 is independently installed on the second tool head 10. The machining allowance between the roughing tool 8 and the thread cutter 9 is controlled within the range of 0.2-0.3mm. This design reduces the rapid wear of the threading tool caused by the increased machining allowance, which affects parameters and may even cause tool breakage or chipping. This increases the first-pass yield by 5%. The roughing cutter 8 not only performs roughing but also rough machining of the sealing surface. The roughing cutter 8 is independently installed on the second cutter head 10 and uses wear compensation alone. The cutting allowance left for the thread cutter 9 is controllable, avoiding the mutual interference problem of segmented compensation and segmented machining in programming.

[0026] The third tooling unit includes a rotating turret 1, a hollow third tool holder 3, a third tool head 4, a third tooling group, and a third drive mechanism. The third tooling group includes a sealing tool 6 and a threading tool 9. One end of the third tool holder 3 is connected to the rotating turret 1 through a third fixed connector 2. The rotating turret 1 is fixed on the rotating turret support frame 19. The third tool head 4 is fixed to the other end of the third tool holder 3. The third drive mechanism is integrated into the internal cavity of the third tool holder 3 (not shown in the figure) and is used to drive the axial and radial movement of the third tooling group. The end of the third tool head 4 is provided with a sealing tool 6 position and a threading tool 9 position, which are respectively installed with the sealing tool 6 and the threading tool 9. The radial height of the threading tool 9 is higher than that of the sealing tool 6, and the horizontal distance between the tip of the sealing tool 6 and the tip of the threading tool 9 is greater than the nose length of the special thread product. The horizontal distance between the sealing tool 6 and the threading tool 9 is configured to avoid the nose structure of the special thread product, ensuring that the sealing tool 6 processes the sealing surface after the threading tool 9 completes the threading process.

[0027] In the special thread machining process, the thread cutter 9 is used to cut precise internal or external threads on the workpiece. The sealing cutter 6 is a diamond-shaped insert used to machine multi-angle sealing surfaces, ensuring their flatness and smoothness for effective sealing. The thread cutter 9 and sealing cutter 6 are mounted together on the third cutter head 4. The radial height of the thread cutter 9 is higher than that of the sealing cutter 6, with a height difference of 2-3 mm. The horizontal distance between the tips of the sealing cutter 6 and the thread cutter 9 is 10-20 mm, ensuring it is greater than the nose length of the special thread product. The thread cutter 9 is a single-tooth or two-tooth insert used for multiple passes of special thread machining, improving tool life and reducing scrap caused by tool wear. Distributing the thread cutter 9 and sealing cutter 6 on a single cutter head improves machining efficiency, reduces cutter head rotation time, and lowers the cost of repairing and restoring cutter head rotation function. It also reduces tool change time during machining. After thread machining, the system replaces the tool offset and directly machines the sealing part, improving overall production efficiency.

[0028] The first, second, and third drive mechanisms, including servo motors and lead screws, are coordinated and controlled by a control system (not shown in the figure) to achieve sequential machining of multiple tool groups.

[0029] How to use this utility model:

[0030] When special threading is being produced on steel pipe 7, the roughing cutter 8 on the second cutter head 10 performs roughing while the inner round cutter 14 on the first cutter head 15 performs inward turning and end face cutting according to the processing procedure. After processing, the roughing cutter 8 returns to the working origin. After the roughing is completed, the thread cutter 9 on the third cutter head 4 performs thread processing. After the thread processing is completed, the thread cutter 9 returns, and the control system replaces the tool compensation with the sealing cutter 6 to directly process the sealing part, thereby improving the overall production efficiency and processing qualification rate.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A tool set structure for a thread turning machine used for special thread processing, characterized in that, include: The support frame includes a rotating turret support frame (19) and a fixed support frame (13) arranged perpendicular to the axial direction, and a first tool bar support frame (18) arranged along the axial direction. The rotating turret support frame (19), the fixed support frame (13), and the first tool bar support frame (18) are installed on the machine tool. The third cutter unit includes a rotating turret (1), a hollow third cutter bar (3), a third cutter head (4), a third cutter group, and a third drive mechanism. The third cutter group includes a sealing cutter (6) and a threading cutter (9). One end of the third cutter bar (3) is connected to the rotating turret (1) through a third fixed connector (2). The rotating turret (1) is fixed on the rotating turret support frame (19). The third cutter head (4) is fixed to the other end of the third cutter bar (3). The third drive mechanism is integrated into the internal cavity of the third cutter bar (3) and is used to drive the third cutter group to move axially and radially. The end of the third cutter head (4) is provided with a sealing cutter (6) position and a threading cutter (9) position, which are respectively installed with the sealing cutter (6) and the threading cutter (9). The radial height of the threading cutter (9) is higher than that of the sealing cutter (6), and the horizontal distance between the tip of the sealing cutter (6) and the tip of the threading cutter (9) is greater than the nose length of the special buckle product. The second blade assembly unit includes a hollow second blade bar (11), a second blade head (10), a shovel blade (8), and a second drive mechanism. One end of the second blade bar (11) is fixed to a fixed support frame (13) via a second fixed connector (12), and the other end is connected to the second blade head (10). A shovel blade (8) position is provided at the end of the second blade head (10), and the shovel blade (8) is installed accordingly. The second drive mechanism is integrated into the internal cavity of the second blade bar (11) and is used to drive the second blade assembly to move axially and radially. The first tool assembly unit includes a hollow first tool holder (16), a first tool head (15), an inner round tool (14), and a first drive mechanism. One end of the first tool holder (16) is fixed to the first tool holder support frame (18) through a first fixed connector (17), and the other end is connected to the first tool head (15). An inner round tool (14) position is provided at the end of the first tool head (15), and the inner round tool (14) is installed accordingly. The first drive mechanism is integrated into the internal cavity of the first tool holder (16) and is used to drive the first tool assembly to move axially.

2. The thread-cutting machine tool assembly structure according to claim 1, characterized in that, The machining allowance between the roughing cutter (8) and the threading cutter (9) is controlled within the range of 0.2-0.3mm.

3. The thread-cutting machine tool assembly structure according to claim 1, characterized in that, The radial height difference between the tip of the thread cutter (9) and the tip of the sealing cutter (6) is 2-3 mm.

4. The thread-cutting machine tool assembly structure according to claim 1, characterized in that, The axial horizontal distance between the tip of the thread cutter (9) and the tip of the sealing cutter (6) is 10-20 mm.

5. The thread-cutting machine tool assembly structure according to claim 1, characterized in that, The thread cutter (9) is a single-tooth or two-tooth blade.

6. The thread-cutting machine tool assembly structure according to claim 1, characterized in that, The inner circular cutter (14) is a square blade.

7. The thread-cutting machine tool assembly structure according to claim 1, characterized in that, The sealing blade (6) is a rhomboid sealing blade (6) piece.

8. The thread-cutting machine tool assembly structure according to claim 1, characterized in that, The first, second, and third drive mechanisms are coordinated and controlled by the control system to achieve sequential processing of multiple tool groups.

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