Profiling tool rest for cutting outer circle and inner circle

Abstract

The utility model relates to the technical field of mechanical cutting knife rests, in particular to a profiling knife rest for cutting an outer circle and an inner circle, which is characterized in that a nitrogen spring carriage is additionally arranged on the basis of a knife rest feed mechanism, so that the self-adaptive extension and retraction of a knife are realized, and the magnitude of the counter-acting force of a spring is determined by the inflating air pressure of a nitrogen spring; the size of the acting force is fixed and controllable and is not affected by the telescopic length, meanwhile, the cutter feeding mechanism is designed in a closed mode, the chip blocking function is achieved, and assistance is provided for precise cutting of a steel pipe groove and stable operation of a cutting device.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical cutting tool holders, in particular to a profile tool holder for cutting outer and inner circles. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] During the mechanical cutting process of the end face groove of the steel pipe, since the tool and the tool holder on the tool holder device are generally rigidly connected, when the ovality of the steel pipe is large or the deviation between the rotation center of the machine-mounted tool holder device and the central axis of the steel pipe is large, the size of the groove after cutting is different, which cannot meet the requirements of high-precision groove cutting.

[0004] The solution in the prior art is to add an improved method of adding a helical compression spring to the conventional tool holder device, so that the cutting tool always presses against the steel pipe under the action of the reaction force of the compression spring, thereby compensating for the groove processing accuracy problem caused by errors in steel pipe precision, clamping precision, mechanical movement precision, etc. However, after the helical compression spring is added, the structure of the tool holder device will appear more complicated and bulky, and because the reaction force of the helical compression spring is affected by the change in compression length, the magnitude of the spring reaction force cannot be accurately controlled. In addition, the fatigue strength caused by the number of times the spring is expanded and contracted will cause spring failure. Therefore, the addition of a compression helical spring also has many shortcomings in the precision of steel pipe groove cutting. In addition, the existing tool holder device does not have a chip protection function. During the cutting process, iron chips often fall into the spiral groove of the feed screw nut of the tool holder device, causing the tool holder feed to get stuck, thereby causing malfunctions.

[0005] Based on the above reasons, the utility model designs a contoured tool holder for external and internal cutting, which can adapt to the size of the spring reaction force without being affected by the telescopic length and spring fatigue, and further has an anti-chipping function to improve the stability of the device operation. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a contoured tool holder for external and internal cutting, which can adapt to the size of the spring reaction force without being affected by the telescopic length and spring fatigue, and further has an anti-chipping function to improve the stability of the device operation.

[0007] In order to achieve the above-mentioned object, the utility model provides a profiling tool holder for external and internal cutting, comprising a feed mechanism, a spring mechanism and a chip guard mechanism;

[0008] The main body of the feed mechanism is the tool holder seat, which is connected to the fixed plate by screw three. A seat bearing is installed on one side of the fixed plate by screw four. A feed screw is installed in the center of the seat bearing. A shaft retaining ring is sleeved on the outside of the feed screw. A feed ratchet is sleeved on the outside of the shaft retaining ring. An adjustment block for adjusting the gap of the dovetail block is provided inside the tool holder seat by screw two. A feed nut is installed on the feed screw inside the tool holder seat, and the feed nut is transmission-connected to the dovetail block.

[0009] The spring mechanism is located on the tool elastic seat above the feed mechanism, and a screw seven is provided on the tool elastic seat, the inner end of the screw seven abuts the tool elastic slider, a pair of linear guide shafts are provided on both side wings of the tool elastic slider, and the linear guide shafts are limited by a pair of screws one on the outer side of the tool elastic slider, a formed tool rod is provided in the middle of the tool elastic slider, a nitrogen spring is provided on one side of the tool elastic seat, and the inner end of the nitrogen spring is connected to the tool elastic slider;

[0010] The chip guard mechanism is set above the tool holder through screw five. The chip guard mechanism is located at both ends of the dovetail block. The baffle in the chip guard mechanism is connected to the outer side of the dovetail block through screw six. The inner side of the dovetail block is connected to the chip guard plate, and the inner side of the chip guard plate is connected to the pad block.

[0011] A key is provided in the axial direction on the outer side of the fixing plate.

[0012] The nitrogen spring and screw 7 are kept on the same axis.

[0013] Linear shaft sleeves are arranged on both sides of the linear guide shaft close to the elastic sliding block of the tool, and a second shaft retaining ring is arranged on the inner side of the linear shaft sleeve.

[0014] A pair of blocking pieces are respectively provided on the outer sides of the two vertical surfaces of the tool elastic seat and located at the axial position of the linear guide shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model is based on the tool holder feed mechanism, and is equipped with a nitrogen spring slide to realize the adaptive extension and retraction of the tool, wherein the magnitude of the spring reaction force is determined by the air pressure of the nitrogen spring inflation, and the magnitude of the spring reaction force is fixed and controllable, and is not affected by the extension and retraction length. It can adaptively compensate for the groove processing accuracy problems caused by errors such as steel pipe accuracy, clamping accuracy, and mechanical movement accuracy. The closed design of the feed mechanism prevents chip falling and ensures the normal operation of the tool holder device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the utility model.

[0018] Figure 2 This is a schematic AA cross-sectional view of the present invention.

[0019] Figure 3 It is a three-dimensional schematic diagram of the present utility model.

[0020] Description of reference numerals:

[0021] 1 is screw one, 2 is tool holder seat, 3 is adjustment block, 4 is screw two, 5 is fixing plate, 6 is screw three, 7 is seat bearing, 8 is screw four, 9 is feed screw, 10 is shaft retaining ring one, 11 is feed ratchet, 12 is screw five, 13 is feed nut, 14 is dovetail block, 15 is key, 16 is spacer block, 17 is chip guard plate, 18 is baffle, 19 is screw six, 20 is screw seven, 21 is tool elastic seat, 22 is tool elastic slider, 23 is forming tool rod, 24 is nitrogen spring, 25 is shaft retaining ring two, 26 is linear bushing, 27 is linear guide shaft, 28 is baffle. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0023] The present invention will now be further described with reference to the accompanying drawings.

[0024] See also Figures 1 to 3 , the utility model provides a profiling tool holder for external and internal cutting, comprising a feed mechanism, a spring mechanism and a chip blocking mechanism;

[0025] The main body of the feed mechanism is the tool holder seat 2, which is connected to the fixed plate 5 by screw three 6. A seat bearing 7 is installed on one side of the fixed plate 5 by screw four 8. A feed screw 9 is installed in the center of the seat bearing 7. A shaft retaining ring 10 is sleeved on the outside of the feed screw 9. A feed ratchet 11 is sleeved on the outside of the shaft retaining ring 10. An adjustment block 3 for adjusting the gap of the dovetail block 14 is provided inside the tool holder seat 2 by screw two 4. A feed nut 13 is installed on the feed screw 9 inside the tool holder seat 2, and the feed nut 13 is transmission-connected to the dovetail block 14.

[0026] The spring mechanism is located on the tool elastic seat 21 above the feed mechanism. A screw 20 is provided on the tool elastic seat 21. The inner end of the screw 20 abuts against the tool elastic slider 22. A pair of linear guide shafts 27 are provided on both sides of the tool elastic slider 22. The linear guide shafts 27 are limited by a pair of screws 1 on the outer side of the tool elastic slider 22. A formed tool rod 23 is provided in the middle of the tool elastic slider 22. A nitrogen spring 24 is provided on one side of the tool elastic seat 21. The inner end of the nitrogen spring 24 is connected to the tool elastic slider 22.

[0027] The chip guard mechanism is set above the tool holder seat 2 by screw five 12. The chip guard mechanism is located at both ends of the dovetail block 14. The baffle 18 in the chip guard mechanism is connected to the outer side of the dovetail block 14 by screw six 19. The inner side of the dovetail block 14 is connected to the chip guard plate 17, and the inner side of the chip guard plate 17 is connected to the pad block 16.

[0028] A key 15 is provided on the axial direction of the feed screw 9 outside the fixing plate 5 .

[0029] The nitrogen spring 24 and the screw 7 20 are kept on the same axis.

[0030] Linear sleeves 26 are provided on both sides of the linear guide shaft 27 near the elastic tool slide block 22 , and a second shaft retaining ring 25 is provided on the inner side of the linear sleeve 26 .

[0031] A pair of blocking pieces 28 are respectively provided on the outer sides of the two vertical surfaces of the tool elastic seat 21 and located in the axial position of the linear guide shaft 27.

[0032] Working principle:

[0033] Nitrogen gas at a set pressure is injected into the nitrogen spring 24, ensuring that the reaction force generated by the spring meets the cutting requirements. This contoured tool holder is installed on the cutting machine, with the steel pipe positioned to the right of the forming tool bar 23. The tool on the forming tool bar 23 feeds radially from the outer diameter of the steel pipe toward its center. During installation, the blade edge of the forming tool bar 23 contacts the steel pipe, retracting the telescopic rod of the nitrogen spring 24 by 5 to 10 mm. Two sets of linear bushings 26 and linear guide shafts 27 provide guidance for the nitrogen spring 24. The feed ratchet 11 rotates one tooth under the periodic impact of the impact block, driving the feed screw 9 to rotate a certain angle. The feed nut 13 then moves the dovetail block 14 a certain distance, thereby driving the tool elastic seat 21, tool elastic slider 22, forming tool bar 23, and nitrogen spring 24, all fixed to the dovetail block 14, to achieve periodic feed. The adjustment block 3 is used to adjust the clearance of the dovetail block 14.

[0034] During the cutting process, regardless of the precision deviation caused by the ovality deviation of the steel pipe or the processing and assembly deviation of the clamped parts, the nitrogen spring 24 can adaptively compensate for the corresponding deviation distance under the action of the air pressure of the retracted telescopic rod and the inflation of the nitrogen spring 24, so that the cutting depth remains unchanged and the groove size is consistent.

[0035] The baffle 18, the chip guard plate 17 and the raised block 16 on the inner side of the chip guard plate 17 completely isolate the tool elastic seat 21 outside the plane to achieve a closed design, preventing chips from falling into the feed screw 9 and the feed nut 13, thereby protecting the feed mechanism and allowing the device to operate normally and stably.

[0036] The above are only preferred embodiments of the present invention and are intended to help understand the method and core concept of this application. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be pointed out that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

[0037] The utility model solves as a whole the problems of groove processing accuracy caused by errors in steel pipe precision, clamping precision, mechanical movement precision, etc. in the existing technology of the steel pipe end face cutting tool holder device, as well as spring failure caused by fatigue strength, and additional chip dropping problems. By adding a nitrogen spring drag plate on the basis of the tool holder feed mechanism, the adaptive extension and retraction of the tool is realized. The magnitude of the spring reaction force is determined by the air pressure of the nitrogen spring inflation. The magnitude of the force is fixed and controllable and is not affected by the extension and retraction length. At the same time, the closed design of the feed mechanism has a chip blocking function, which provides assistance for the precise cutting of the steel pipe groove and the stable operation of the cutting device.

Claims

1. A profiling tool holder for external and internal cutting, characterized in that: It includes a feed mechanism, a spring mechanism and a chip blocking mechanism; The main body of the feed mechanism is a tool holder seat (2), the tool holder seat (2) is connected to the fixed plate (5) by screw three (6), a seat bearing (7) is installed on one side of the fixed plate (5) by screw four (8), a feed screw (9) is installed in the center of the seat bearing (7), the outer side of the feed screw (9) is sleeved with a shaft retaining ring (10), the outer side of the shaft retaining ring (10) is sleeved with a feed ratchet (11), an adjustment block (3) for adjusting the gap of the dovetail block (14) is provided inside the tool holder seat (2) by screw two (4), a feed nut (13) is installed on the feed screw (9) inside the tool holder seat (2), and the feed nut (13) is connected to the dovetail block (14) in a transmission manner; The spring mechanism is located on the tool elastic seat (21) above the feed mechanism, and a screw seven (20) is provided on the tool elastic seat (21), and the inner end of the screw seven (20) abuts against the tool elastic slider (22), and a pair of linear guide shafts (27) are provided on both side wings of the tool elastic slider (22), and the linear guide shafts (27) are limited by a pair of screws one (1) on the outer side of the tool elastic slider (22), and a forming tool rod (23) is provided in the middle of the tool elastic slider (22), and a nitrogen spring (24) is provided on one side of the tool elastic seat (21), and the inner end of the nitrogen spring (24) is connected to the tool elastic slider (22); The chip guard mechanism is arranged above the tool holder seat (2) by screw five (12), and the chip guard mechanism is located at both ends of the dovetail block (14). The baffle (18) in the chip guard mechanism is connected to the outer side of the dovetail block (14) by screw six (19), and the inner side of the dovetail block (14) is connected to the chip guard plate (17), and the inner side of the chip guard plate (17) is connected to the padding block (16).

2. The profiling tool holder for external and internal cutting according to claim 1, characterized in that: The feed screw (9) is provided with a key (15) in the axial direction outside the fixing plate (5).

3. The profiling tool holder for external and internal cutting according to claim 1, characterized in that: The nitrogen spring (24) and the screw seven (20) are maintained on the same axis.

4. The profiling tool holder for external and internal cutting according to claim 1, characterized in that: A linear sleeve (26) is provided on both sides of the linear guide shaft (27) close to the elastic tool slide block (22), and a second shaft retaining ring (25) is provided on the inner side of the linear sleeve (26).

5. The profiling tool holder for external and internal cutting according to claim 1, characterized in that: A pair of baffles (28) are provided on the outer sides of the two vertical surfaces of the tool elastic seat (21) at the axial position of the linear guide shaft (27).

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