CN110091197A - A kind of device and method of automatic inhibition thin-walled revolution workpiece milling vibration - Google Patents

Abstract

The invention relates to a device and method for automatically suppressing milling vibration of a thin-walled rotary body, which mainly includes a base, a main shaft, a support plate, and a vibration damping block. On the outside of the base, the main shaft is placed in the center of the base surface, the rectangular end of the connecting block is fixed on the inner side of the support plate by screws, and the cylindrical end is connected to the main shaft through the electric push rod assembly, which consists of the front end of the push rod, the push rod sleeve, the motor, Composed of driving gear, intermediate gear, driven gear, lead screw nut, and lead screw, multiple rubber shock absorbers are installed between the support plate and the shock absorber, the arc surface of the shock absorber matches the workpiece, and the bottom of the shock absorber is equipped with Roller with bearing, and the fixed block is used to lock the roller shaft, and the support plate is equipped with rollers; the invention can realize automatic suppression of milling vibration in the process of processing thin-walled revolving bodies, and realize processing quality requirements while meeting processing efficiency. Features of automation and high precision.

Description

A device and method for automatically suppressing milling vibration of a thin-walled rotary body

technical field

The invention relates to a milling processing device for a rotary body, in particular to a device and method for automatically suppressing milling vibration of a thin-walled rotary body.

Background technique

Large thin-walled rotary parts are widely used in high-end manufacturing fields such as aerospace because of their light weight and good integrity. In the manufacturing process of such parts, milling is usually used to remove up to 80% to 90% of excess material. Due to the low rigidity of the large thin-walled rotary body, cutting vibrations are prone to occur during the machining process, which seriously affects the machining quality. Therefore, in order to complete the milling of such parts and reduce the serious problems caused by cutting vibration, the current method is to reduce the processing parameters, which reduces the cutting vibration but reduces the production efficiency. Therefore, in order to solve the current problems such as excessive cutting vibration in the milling of such thin-walled parts, the present invention designs a device and method for automatically suppressing the milling vibration of thin-walled rotary bodies, which improves the rigidity of thin-walled parts during processing, reduces the The impact of cutting vibration on processing quality.

Contents of the invention

The purpose of the invention is to solve the above problems, and to propose a device and method for automatically suppressing the milling vibration of a thin-walled rotary body.

The purpose of the present invention is achieved through the following technical solutions: First, a device for automatically suppressing milling vibration of a thin-walled rotary body mainly includes a base, a main shaft, a support plate, and a vibration damping block, and is characterized in that the clamp passes through the edge of the base as a whole It is fixed with the machine tool, the quick-release pressure plates are evenly distributed on the outside of the base, the main shaft is placed in the center of the base surface and connected by hexagon socket screws, the rectangular end of the connecting block is fixed on the inner side of the support plate by screws, and the cylindrical end is connected with the main shaft by an electric push rod assembly , the electric push rod assembly is composed of the front end of the push rod, the push rod sleeve, the motor, the driving gear, the intermediate gear, the driven gear, the screw nut, and the lead screw. Multiple rubber shock absorbers are installed between the support plate and the damping block. , the arc surface of the damping block matches the workpiece, the bottom of the damping block is equipped with a bearing roller, and the roller shaft is locked with a fixed block, and the support plate is equipped with rollers;

There is an arc-shaped rib groove on the surface of the vibration damping block, which is used to avoid interference with the rib plate on the inner wall of the workpiece, and at the same time facilitates the discharge of chips and coolant. There is a force sensor fixing groove on the upper part of the vibration damping block, and two holes in the middle. The vibration sensor fixing hole has a roller groove at the bottom, and the roller and roller shaft are installed in the roller groove and are threaded with the vibration damping block through the fixing block;

There is a main shaft through hole in the center of the main shaft for placing the cables of the vibration sensor and the force sensor. The upper and lower ends of the main shaft are respectively milled with six upper and lower fixing surfaces for connecting and fixing the push rod sleeve. At the same time, a threading hole is opened at the lower end of the main shaft Guide the cables of the vibration sensor and the force sensor into the through hole of the main shaft, and there is a supporting chassis at the bottom of the main shaft for connecting the base;

The surface of the base is uniformly provided with roller slide grooves, pressure plate grooves, and the center hole of the base. The quick-release pressure plates are evenly distributed on the outer surface of the base. The cylindrical pins are placed in the pressure plate grooves after passing through the pin holes of the pressure plate. Connection, the roller chute on the surface of the base matches the roller on the support plate;

The quick-release pressure plate is provided with two pressure plate connecting holes for threaded connection to the base, and a pressure plate pin hole is opened at the lower end of the quick-release pressure plate. After inserting a cylindrical pin, it is used to determine the radial position of the pressure plate in the entire fixture and as a quick release during disassembly. The axis of rotation of the platen.

In the second aspect, a method for automatically suppressing milling vibration of a thin-walled rotary body includes:

S1 Place the workpiece to be processed to the clamp body, extend the push rod to the diameter of the workpiece to support the workpiece, lock the quick release pressure plate, and start processing;

The S2 vibration sensor continuously detects the workpiece milling amplitude A, and sends the data back to the control end;

The analysis software of the S3 control terminal processes the data of the amplitude A and substitutes it into the relevant function Get the corresponding support force F, where [α] is the trigger push rod fine-tuning boundary value, related parameters: ω is the vibration frequency at the workpiece l, l is the three-dimensional vector expressing the cutting position, h is the thickness of the workpiece, and v _f is the feed rate , n is the rotational speed;

S4 When A≥[α], the electric push rod is fine-tuned;

The S5 force sensor continuously detects the size of the support force F. When F reaches the required support force calculated by the above function, the motor stops rotating and the front end of the push rod stops;

In the subsequent process of S6, when A gradually decreases, the front end of the push rod is fine-tuned, and the force sensor continues to detect the size of the supporting force F. When F=0, the motor stops rotating, and the front end of the push rod stops;

S7 vibration sensor detects workpiece milling amplitude A, when A=0, it is judged that the milling process is completed and enters S8, when A≠0, it is determined that the milling process is not completed and enters S2;

S8 processing is completed, and the workpiece is removed.

Beneficial effects of the present invention:

1. Relying on the use of vibration sensors and force sensors, real-time monitoring of the milling amplitude A and fixture support force F during the milling process of the workpiece can be realized. Once the amplitude is too large, the front end of the push rod can be controlled by controlling the motor to provide more precision for the workpiece. Stable support. It realizes the processing quality requirements while meeting the processing efficiency, and has the characteristics of automation and high precision.

2. Relying on the stable ball screw push rod structure, the precise fine-tuning of the push rod driving the vibration damping block can be realized. At the same time, the support plate is equipped with rollers, and the vibration damping block is equipped with rollers, which makes the process of fixture self-adaptation easier and faster.

3. Relying on the design and use of the new quick-release pressure plate, when unloading the workpiece, it is only necessary to loosen the fast-release pressure plate fixing bolts and then rotate outward around the cylindrical pin, and the workpiece can be unloaded without completely removing the pressure plate. When installing the next workpiece, the quick release pressure plate rotates inwardly around the cylindrical pin and contacts the workpiece to lock the bolt.

Description of drawings

Figure 1 is a structural diagram of the automatic vibration suppression system;

Figure 2 is the schematic diagram of the assembly of the thin-walled rotary milling fixture;

Fig. 3 is a schematic diagram of a clamping workpiece of a thin-walled rotary body milling fixture;

Fig. 4 is a full sectional view of the assembly of the thin-walled rotary milling fixture;

Fig. 5 is a partial assembly drawing of the thin-walled rotary milling fixture;

Figure 6 is a partial assembly drawing of the push rod of the thin-walled rotary milling fixture

Figure 7 is a schematic diagram of the assembly of the damping block and the drum;

Figure 8 is a schematic diagram of the main shaft;

Figure 9 is a schematic diagram of the bottom plate;

Figure 10 is a schematic diagram of the quick release pressure plate;

Figure 11 is a flow chart of dynamic vibration suppression;

In the figure: 1-connection block; 2-force sensor; 3-damping block; 4-workpiece; 5-push rod front end; 6-lead screw nut; 7-lead screw; 8-push rod sleeve; 10-driven gear; 11-intermediate gear; 12-driving gear; 13-motor; 14-rubber damper; 15-vibration sensor; 16-roller shaft; 17-quick release pressure plate; 18-base; 19-support Plate; 20-roller; 21-fixed block; 22-roller; 23-rib groove; 24-force sensor fixing groove; 25-vibration sensor fixing hole; 26-roller groove; 27-spindle through hole; 28-upper fixing Surface; 29-threading hole; 30-lower fixed surface; 31-support chassis; 32-roller chute; 33-base center hole; 34-press plate groove;

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

As shown in Figure 1, the automatic vibration suppression system includes fixtures, vibration collectors, support force analyzers, and electric push rod drivers.

As shown in Figures 2, 3, 4, and 5, a device for automatically suppressing milling vibration of a thin-walled rotary body mainly includes a base 18, a main shaft 9, a support plate 19, and a vibration damping block 3, and is characterized in that the fixture passes through the base as a whole The edge of 18 is fixed to the machine tool, the quick release pressure plate 17 is evenly distributed on the outside of the base 18, the main shaft 9 is placed in the center of the surface of the base 18 and connected by hexagon socket screws, the rectangular end of the connecting block 1 is fixed on the inner side of the support plate 19 by screws, and the cylindrical end It is connected with the main shaft 9 through the electric push rod assembly, which is composed of the front end of the push rod 5, the push rod sleeve 8, the motor 13, the driving gear 12, the intermediate gear 11, the driven gear 10, the lead screw nut 6 and the lead screw 7 , a plurality of rubber shock absorbers 14 are installed between the support plate 19 and the shock absorber 3, the arc surface of the shock absorber 3 is matched with the workpiece 4, and the bottom of the shock absorber 3 is equipped with a bearing roller 22, which is locked by the fixed block 21 Dead roller shaft 16, support plate 19 is equipped with roller 20.

As shown in Figure 6, the push rod assembly is composed of the front end of the push rod 5, the screw nut 6, the lead screw 7, the driven gear 10, the intermediate gear 11, the driving gear 12, and the motor 13. Connected by bolts.

As shown in Figure 7, the surface of the damping block 3 is provided with an arc-shaped rib groove 23, which is used to avoid interference with the ribs on the inner wall of the workpiece 4, and at the same time facilitates the discharge of chips and coolant. The force sensor fixing groove 24 has two vibration sensor fixing holes 25 in the middle, and the bottom has a roller groove 26. The roller 22 and the roller shaft 16 are housed in the roller groove 26 and are threadedly connected with the damping block 3 by the fixing block 21.

As shown in Figure 8, the center of the main shaft 9 has a main shaft through hole 27 for placing the cables of the vibration sensor 15 and the force sensor 2, and the upper and lower ends of the main shaft 9 are respectively milled with six upper fixing surfaces 28 and lower fixing surfaces 30 for easy connection. The push rod sleeve 8 is fixed, and the threading hole 29 is provided at the lower end of the main shaft 9 to guide the cables of the vibration sensor 15 and the force sensor 2 into the main shaft through hole 27, and the bottom of the main shaft 9 has a support chassis 31 for connecting the base 18.

As shown in FIG. 9 , roller slide grooves 32 , platen grooves 34 , and a center hole 33 of the base are uniformly provided on the surface of the base 18 . The quick-release pressure plate 17 is evenly distributed on the outer surface of the base 18. The cylindrical pin passes through the pin hole 36 of the pressure plate and is placed in the groove 34 of the pressure plate. The bolt is used to pass through the connection hole 35 of the pressure plate to connect with the base 18. The roller chute 32 on the surface of the base 18 Cooperate with the roller 20 on the support plate 19.

As shown in Figure 10, the quick release pressure plate 17 is provided with two pressure plate connection holes 35 for screwing the base 18, and the lower end of the quick release pressure plate 17 is provided with a pressure plate pin hole 36, which is used to determine the position of the pressure plate in the entire fixture after the straight pin is inserted. The radial position and as the rotation axis of the quick release pressure plate 17 during disassembly.

As shown in Figure 11, a method of automatically suppressing the milling vibration of a thin-walled rotary body. include:

S1 Place the workpiece to be processed to the clamp body, extend the push rod to the diameter of the workpiece to support the workpiece, lock the quick release pressure plate, and start processing;

The S2 vibration sensor continuously detects the workpiece milling amplitude A, and sends the data back to the control end;

The analysis software of the S3 control terminal processes the data of the amplitude A and substitutes it into the relevant function Get the corresponding support force F, where [α] is the trigger push rod fine-tuning boundary value, related parameters: ω is the vibration frequency at the workpiece l, l is the three-dimensional vector expressing the cutting position, h is the thickness of the workpiece, and v _f is the feed rate , n is the rotational speed;

S4 When A≥[α], the electric push rod is fine-tuned;

The S5 force sensor continuously detects the size of the support force F. When F reaches the required support force calculated by the above function, the motor stops rotating and the front end of the push rod stops;

In the subsequent process of S6, when A gradually decreases, the front end of the push rod is fine-tuned, and the force sensor continues to detect the size of the supporting force F. When F=0, the motor stops rotating, and the front end of the push rod stops;

S7 vibration sensor detects workpiece milling amplitude A, when A=0, it is judged that the milling process is completed and enters S8, when A≠0, it is determined that the milling process is not completed and enters S2;

S8 processing is completed, and the workpiece is removed.

Specific examples:

First assemble the fixture as shown in Figure 2, and install the fixture vertically on the base of the five-axis vertical machining center, connect the push rod motor 13, vibration sensor 15, and force sensor 2 to the electronic control system, and then according to the The diameter of the push rod front end 5 is retracted to drive the support plate 19 and the damping block 3 back, and the workpiece 4 is placed from top to bottom; by controlling the motor 13 to start and stop, the gear and the ball screw are driven to rotate to realize the front end of the push rod 5 to advance. After the vibration damping block 3 is fully attached to the workpiece 4, rotate the quick release pressure plate 17 and use the bolts to connect with the base 18 to press the workpiece 4 and start processing; the vibration sensor 15 continuously monitors the vibration and transmits data to the computer during the processing, and the system will After the data processing, the current required support force is obtained, and the gear and the ball screw are rotated by the motor 13 to start and stop to realize the front end of the push rod 5 to advance or retreat to realize the rigidity of the workpiece 4 and reduce the cutting vibration. After completing the processing, the electronic control system controls the front end 5 of the push rod to retract, driving the support plate 19 and the damping block 3 to retract. Ensure that the vibration damping block 3 is completely separated from the workpiece 4, then loosen the bolts on the quick release pressure plate 17 and lift the quick release pressure plate 17 upwards and rotate it outward around the cylindrical pin, then put it down, and finally remove the workpiece 4.

Claims (2)

1. a kind of automatic device and method for inhibiting thin-walled revolution workpiece milling vibration, wherein inhibiting thin-walled revolution workpiece milling vibration automatically Dynamic device mainly includes pedestal (18), main shaft (9), support plate (19), damping block (3), it is characterised in that: fixture entirely through Pedestal (18) edge is fixed with lathe, and Quick Release pressing plate (17) is evenly arranged on the outside of pedestal (18), and main shaft (9) is placed in pedestal (18) surface Center and connected by soket head cap screw, the rectangular end of link block (1) is fixed by screws on the inside of support plate (19), cylinder End connect with main shaft (9) by electric pushrod component, electric pushrod component by push rod front end (5), pushing rod sleeve (8), motor (13), Driving gear (12), intermediate gear (11), driven gear (10), feed screw nut (6), lead screw (7) composition, support plate (19) and subtract It shakes and multiple rubber absorbers (14) is housed between block (3), damping block (3) cambered surface and workpiece (4) cooperate, damping block (3) bottom dress There is band bearing roller (22), and lock drum shaft (16) using fixed block (21), support plate (19) is equipped with idler wheel (20)；

Damping block (3) surface is provided with arcuate rib board slot (23), interferes for avoiding with the floor of workpiece (4) inner wall, simultaneously Be conducive to chip and coolant liquid discharge, damping block (3) top is provided with a force snesor fixing groove (24), and middle part opens that there are two vibrations Dynamic sensor fixing hole (25), bottom are provided with roller trough (26), in roller trough (26) simultaneously equipped with roller (22) and drum shaft (16) It is threadedly coupled by fixed block (21) with damping block (3)；

Main shaft (9) center is provided with spindle through-hole (27) for placing the cable of vibrating sensor (15) and force snesor (2), main shaft (9) top and bottom mill out six upper stationary plane (28) respectively and lower stationary plane (30) is convenient for being connected and fixed pushing rod sleeve (8), Main shaft (9) lower end opens up threading hole (29) for guiding vibrating sensor (15) and the cable of force snesor (2) to enter master simultaneously Shaft through-hole (27), main shaft (9) bottom have support chassis (31) for connecting pedestal (18)；

Pedestal (18) surface uniformly opens up gyro wheeling concrete chuting (32), pressing plate groove (34), centre hole of base (33), and Quick Release pressing plate (17) is equal Even to be distributed in pedestal (18) outer round surface, straight pin is placed in pressing plate groove (34) after passing through pressing plate pin hole (36), utilizes spiral shell Bolt passes through pressing plate connecting hole (35) and is connected with pedestal (18), on pedestal (18) surface gyro wheeling concrete chuting (32) and support plate (19) Idler wheel (20) matches；

Quick Release pressing plate (17), which is opened up, to be used to be threadedly coupled pedestal (18) there are two pressing plate connecting hole (35), under Quick Release pressing plate (17) End offers pressing plate pin hole (36), is inserted into the radial position for being used to determine pressing plate in entire fixture after straight pin and in disassembly Rotary shaft as Quick Release pressing plate (17).

2. a kind of automatic method for inhibiting thin-walled revolution workpiece milling vibration characterized by comprising

S1 places workpiece to be processed to clamp body, and push rod is extended to diameter of work to support workpiece, locks Quick Release pressing plate, starts to add Work；

S2 vibrating sensor persistently detects workpiece milling amplitude A, and passes data back control terminal；

The analysis software of S3 control terminal substitutes into correlation function to amplitude A data processing Corresponding support force F is obtained, wherein [α] is that triggering push rod finely tunes boundary value, relevant parameter: ω is vibration frequency, l at workpiece l Three-dimensional vector, the h for being expression cutting position are thickness of workpiece, v_fIt is revolving speed for feed speed, n；

S4 electric pushrod as A >=[α] is finely adjusted；

S5 force snesor persistently detects support force F size, and when F reaches the required support force that above-mentioned function is found out, motor stops Rotation, push rod front end stop；

In S6 subsequent process, after A is gradually reduced, push rod front end fine tuning, force snesor persistently detects support force F size, works as F= When 0, motor stalls, push rod front end stops；

S7 vibrating sensor detects workpiece milling amplitude A, determines that S8 is completed and entered to Milling Process as A=0, as A ≠ 0, Determine that processing does not complete and enters S2；

S8 is completed the process, and removes workpiece.