Large numerical control hole slotting machine

Abstract

The utility model discloses a large -scale numerical control inner hole slotting machine relates to inner hole slotting equipment technical field, including servo motor, speed reducer, cutter body subassembly and traction subassembly, and speed reducer installs on servo motor, and servo motor is connected with the axle of taking the key and hole through speed reducer, and cutter body subassembly includes cutter body, spring, cutter bar, blade, output shaft, transmission shaft, screw bush and inclined iron, and cutter body installs on speed reducer, and the bottom fixed mounting of spring is installed on cutter body, and cutter bar fixed mounting is installed at the top of spring, and cutter bar sliding installation is installed on cutter body, and blade fixed mounting is installed on cutter bar. The blade can be used for the processing of long hole keyway under the traction of the oil cylinder, and the device only uses a blade, so the metal chips generated during processing are not stored in the tooth groove, so the device can meet the processing demand of long keyway on long workpiece.

Description

Technical Field

[0001] This utility model relates to the technical field of internal hole grooving equipment, and in particular to a large-scale CNC internal hole grooving machine. Background Technology

[0002] Existing keyway broaching equipment cannot be used for machining long holes. Existing keyway broaches consist of multiple teeth, each with a tooth rise. During machining, metal chips are stored in the tooth grooves between two teeth. When the keyway being machined is too long, the metal chips will fill the tooth grooves, squeezing the broach teeth or the workpiece. Therefore, it can only machine shorter workpieces, resulting in a lack of technology for machining long hole keyways. Utility Model Content

[0003] The purpose of this application is to provide a large-scale CNC internal hole grooving machine to solve the problem mentioned in the background art regarding the keyway broach, which consists of multiple teeth with tooth rise between each tooth. During processing, the metal chips generated are stored in the tooth grooves of two teeth. When the keyway being processed is too long, the metal chips will fill the tooth grooves and squeeze the broach teeth or the workpiece. Therefore, it can only process shorter workpieces, resulting in the lack of processing technology for long hole keyways.

[0004] To achieve the above objectives, this application provides the following technical solution: a large CNC internal hole grooving machine, including a servo motor, a reducer, a tool body assembly and a traction assembly, wherein the reducer is mounted on the servo motor, and the servo motor and the reducer are connected to the hole via a shaft with a flat key;

[0005] The cutter assembly includes a cutter body, a spring, a cutter bar, a blade, an output shaft, a drive shaft, a threaded sleeve, an outer sleeve, and a wedge. The cutter body is mounted on a reducer. The bottom end of the spring is fixedly mounted on the cutter body. The cutter bar is fixedly mounted on the top end of the spring and slidably mounted on the cutter body. The blade is fixedly mounted on the cutter bar. The output shaft is mounted on the reducer, and a servo motor and the reducer drive the output shaft to rotate. The drive shaft is fixedly mounted on the right end of the output shaft. The threaded sleeve is fitted onto the outside of the drive shaft. The outer sleeve is fitted onto the outside of the threaded sleeve and has a threaded section with the threaded sleeve. The wedge is fixedly mounted on the right end of the threaded sleeve. The cutter bar has a slot that matches the wedge. The output shaft, drive shaft, and threaded sleeve are all located inside the outer sleeve. The wedge is located inside the cutter body. The traction assembly is used to drive the blade to move back and forth.

[0006] Furthermore, the blade is made of cemented carbide material.

[0007] Furthermore, the angle of the wedge is 7°.

[0008] Furthermore, the blade has a single-edged structure.

[0009] Furthermore, the traction assembly includes a hydraulic cylinder and a pull rod, with the pull rod fixedly installed between the cutter body and the hydraulic cylinder.

[0010] In summary, the technical effects and advantages of this utility model are as follows:

[0011] In this invention, the cutting blade, under the traction of the hydraulic cylinder, can be used for machining long keyways. Moreover, this equipment uses only one cutting blade, so the metal chips generated during machining will not be stored in the tooth groove. Therefore, this equipment can meet the machining requirements of long keyways on long workpieces. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments or the prior art will be briefly introduced below.

[0013] Figure 1 This is a schematic diagram of the overall structure of the large CNC internal hole grooving machine in the embodiments of this application;

[0014] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0015] Figure 3 This is a cross-sectional view of the tool holder in an embodiment of this application;

[0016] Figure 4 This is a right view of the tool holder in an embodiment of this application;

[0017] Figure 5 These are three views of the blade in an embodiment of this application.

[0018] In the diagram: 1. Servo motor; 2. Reducer; 3. Tool body; 4. Spring; 5. Tool holder; 6. Blade; 7. Output shaft; 8. Drive shaft; 9. Screw sleeve; 10. Wedge; 11. Hydraulic cylinder; 12. Tie rod; 13. Outer sleeve; 14. Threaded mating section; 15. Key. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Example: Reference Figure 1-5 The large CNC internal hole grooving machine shown includes a servo motor 1, a reducer 2, a tool body assembly, and a traction assembly. The housing of the reducer 2 is fixed to the housing of the servo motor 1 by screws, and the servo motor 1 and the reducer 2 are connected to the hole by a shaft with a flat key.

[0021] The tool assembly includes a tool body 3, a spring 4, a tool holder 5, a cutting blade 6, an output shaft 7, a drive shaft 8, a screw sleeve 9, an outer sleeve 13, and a wedge 10. The tool body 3 is fixed to the housing of the reducer 2 with screws. The bottom end of the spring 4 is fixedly mounted on the tool body 3. The tool holder 5 is fixedly mounted on the top end of the spring 4 and slides on the tool body 3. The cutting blade 6 is fixed to the tool holder 5 with screws. The cutting blade 6 is made of cemented carbide and has a single-edged structure, so the metal chips generated during machining will not accumulate on the teeth. Inside the slot, the output shaft 7 is mounted on the reducer 2. The servo motor 1 and the reducer 2 are used to drive the output shaft 7 to rotate. The transmission shaft 8 is fixed to the right end of the output shaft 7 by screws. The threaded sleeve 9 is sleeved on the outside of the transmission shaft 8. The outer sleeve 13 is sleeved on the outside of the threaded sleeve 9 and there is a threaded section 14 between the outer sleeve 9 and the threaded sleeve 9, which converts the rotational motion into linear motion. The wedge 10 is fixed to the right end of the threaded sleeve 9 by screws. The threaded sleeve 9 drives the wedge 10 to move back and forth in the horizontal direction. The tool bar 5 is provided with a slot that matches the wedge 10.

[0022] When the wedge 10 moves to the right, it will push against the tool holder 5, causing the blade 6 to extend outward (feeding) to machine the keyway; when the wedge 10 moves to the left, it will release the tool holder 5, and the blade 6 will retract inward under the action of the spring 4 (retracting); the angle of the wedge 10 is 7°, which is a self-locking angle, and the radial force of the tool holder 5 will not generate a thrust on the drive shaft 8. The output shaft 7, drive shaft 8, and screw sleeve 9 are all located inside the outer sleeve 13, and the wedge 10 is located inside the tool body 3. The traction assembly is used to drive the blade 6 to move back and forth.

[0023] The drive shaft 8 is a flat keyed optical shaft with a key 15 at its end. A corresponding keyway is provided inside the threaded sleeve 9. The drive shaft 8 and the threaded sleeve 9 are connected by the key 15. The servo motor 1 drives the drive shaft 8 to rotate through the output shaft 7 of the reducer 2. The drive shaft 8 drives the threaded sleeve 9 to rotate. Through the threaded section 14, the rotational motion of the threaded sleeve 9 is converted into linear motion, thereby realizing the feed of the tool holder 5.

[0024] The cutting tool 6 extends outward by 0.05 mm or 0.1 mm each time, and retracts and moves the tool back and forth in a cycle. By continuously increasing the feed amount with each machining operation, a certain depth can be machined.

[0025] For controlling the feed rate of insert 6, servo motor 1 and reducer 2 are used. For example, using a threaded sleeve 9 with a pitch of 1 and an angle of 7° for wedge 10, the movement is calculated to be 0.1228mm according to trigonometric functions. When the speed ratio of reducer 2 is 1:25, servo motor 1 rotates 25 times, reducer 2 rotates 1 time, threaded sleeve 9 provides a feed rate of 1mm, and insert 6 extends 0.1228mm. Therefore, the feed rate can be precisely controlled by servo motor 1 and reducer 2. If the cutting amount is 6mm and the feed rate is 0.1mm per cycle, the machining is completed after 60 reciprocating cycles.

[0026] The traction assembly includes a hydraulic cylinder 11 and a pull rod 12. The hydraulic cylinder 11 is equipped with a power source, which is a standard configuration in the field and can be implemented by technicians based on existing technology. The pull rod 12 is fixedly installed between the cutter body 3 and the hydraulic cylinder 11, and is fixed to the right end of the cutter body 3 by screws. The pull rod 12 is also fixed to the piston rod of the hydraulic cylinder 11 by screws. The cutter body assembly can move back and forth by hydraulic drive. The stroke of the blade 6 depends on the stroke of the hydraulic cylinder 11, so the stroke of the blade 6 is basically unlimited. As long as the stroke of the hydraulic cylinder 11 is long enough, a sufficiently long keyway can be machined. The blade 6 in this utility model is different from the broaches of the prior art. The broaches of the prior art will deform if they are too long, which will affect the machining.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A large-scale numerical control inner hole broaching machine, characterized in that: It includes a servo motor (1), a reducer (2), a cutter body assembly and a traction assembly. The reducer (2) is mounted on the servo motor (1), and the servo motor (1) and the reducer (2) are connected by a shaft and hole with a key. The cutter assembly includes a cutter body (3), a spring (4), a cutter bar (5), a blade (6), an output shaft (7), a drive shaft (8), a screw sleeve (9), an outer sleeve (13), and a wedge (10). The cutter body (3) is mounted on a reducer (2). The bottom end of the spring (4) is fixedly mounted on the cutter body (3). The cutter bar (5) is fixedly mounted on the top end of the spring (4) and slides on the cutter body (3). The blade (6) is fixedly mounted on the cutter bar (5). The output shaft (7) is mounted on the reducer (2), and the servo motor (1) and the reducer (2) are used to drive the output shaft (7). The drive shaft (8) is fixedly installed on the right end of the output shaft (7). The screw sleeve (9) is sleeved on the outside of the drive shaft (8). The outer sleeve (13) is sleeved on the outside of the screw sleeve (9) and there is a threaded section (14) between the outer sleeve (9) and the screw sleeve (9). The wedge (10) is fixedly installed on the right end of the screw sleeve (9). The tool bar (5) has a slot that matches the wedge (10). The output shaft (7), drive shaft (8), and screw sleeve (9) are all located inside the outer sleeve (13). The wedge (10) is located inside the tool body (3). The traction assembly is used to drive the blade (6) to move back and forth.

2. The large-scale CNC internal hole grooving machine according to claim 1, characterized in that: The blade (6) is made of cemented carbide.

3. The large-scale CNC internal hole grooving machine according to claim 1, characterized in that: The angle of the wedge (10) is 7°.

4. The large-scale CNC internal hole grooving machine according to claim 2, characterized in that: The blade (6) has a single-edged structure.

5. The large-scale CNC internal hole grooving machine according to claim 1, characterized in that: The traction assembly includes a hydraulic cylinder (11) and a pull rod (12), with the pull rod (12) fixedly installed between the cutter body (3) and the hydraulic cylinder (11).

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