CN104400214A - Device and method for measuring and controlling upsetting force and forward resistance of friction stir welding machine - Google Patents

Abstract

The invention belongs to the field of measurement and control devices and specifically relates to a device and a method for measuring and controlling the upsetting force and the forward resistance of a friction stir welding machine. The device comprises a stirring head, preloading screws, a main shaft, pressure sensors and a main shaft housing, wherein the stirring head is connected with the left side of the main shaft, the main shaft housing is cylindrical, the main shaft is connected with the main shaft housing by use of the main shaft is connected with the main shaft housing by use of eight preloading screws distributed evenly, and the main shaft is not in direct contact with the main shaft housing and a gag is formed between the main shaft and the main shaft housing, and four pressure sensors are mounted between the main shaft and the main shaft housing and evenly distributed in the circumferential direction. According to the device and the method for measuring and controlling the upsetting force and the forward resistance of the friction stir welding machine, the device is small in structure and convenient in loading, and can be effectively applied to measuring the upsetting force and the forward resistance of the friction stir welding equipment in various types; control is realized by use of a PLC and a servo motor and the control accuracy is high; the device and the method are convenient to use.

Description

A kind of friction stir welding lathe upset force and advance drag measure and control device and method

Technical field

This technology belongs to measure and control device field, is specifically related to a kind of friction stir welding lathe upset force and advance drag measure and control device and method.

Background technology

Friction stir welding (Friction Stir Welding is called for short FSW) is the patent of invention that Britain's institute of welding (TWI) proposed in October, 1991.Friction stir welding is mainly used in the welding solving the low melting materials such as aluminium alloy at first, and about the features and application etc. of Friction stir welding, TWI has carried out more research.

At present, research finds that in friction stir welding processing, main shaft has inseparable relation to the advance drag be subject to when the upset force of workpiece and axis feeding with welding quality.Ensure the constant quality that greatly can improve weld seam of operational forces in whole welding process, effectively avoid weld defect.But pressure-measuring system all not relevant on existing friction stir welding lathe at home, effectively cannot measure the pressure change in friction stir welding machine work.And the dynameter on other lathes is additional dynameter mostly, its equipment volume is comparatively large, and structure is special, can not good other equipment of compatibility, is all in order to the lathe of a certain model forms a complete production network mostly.Therefore the comparatively simple dynamometry of friction stir welding lathe spindle design one nested structure and control device is necessary for, to promote in industry.

Summary of the invention

The object of the invention is to: a kind of friction stir welding lathe upset force and advance drag Measurement & Control device and method, control the size of upset force, advance drag.

Technical scheme of the present invention is as follows: a kind of friction stir welding lathe upset force and advance drag measure and control device, it is characterized in that: comprise stirring-head, preload screw, main shaft, pressure sensor, main shaft shell, PLC, feed servo motor, stirring-head is connected with on the left of main shaft, main shaft shell is cylindric, be connected by preloading screw between main shaft with main shaft shell, and main shaft does not directly contact with main shaft shell, in the middle of leave gap, pressure sensor is arranged between main shaft and main shaft shell, the operational forces that stirring-head is subject to is delivered on pressure sensor by main shaft, be delivered to again in main shaft shell, described feed servo motor comprises the control feed servo motor of vertical direction and the feed servo motor in level of control direction, the pressure data that pressure sensor produces is transferred in PLC, PLC convert obtain upset force, advance drag numerical value, pass to and control the feed servo motor of vertical direction and the feed servo motor in level of control direction, control main shaft respectively to the volume under pressure of workpiece and axis feeding speed.

Be connected by 8 equally distributed preloading screws between main shaft with main shaft shell, by 8 preloading screws, preloading on four pressure sensors can be adjusted, ensure that pressure sensor has certain preloading before work, and preloading on four pressure sensors is consistent.

Having 4 pressure sensors is arranged between main shaft and main shaft shell, is uniformly distributed in a circumferential direction.

A kind of friction stir welding lathe upset force and advance drag investigating method, is characterized in that: comprise the following steps

Step one: stirring-head is subject to the counter-force F of upset force straight up by pressure sensor _dand the advance drag F contrary with direction of feed _qdata be sent in PLC;

The data that step one obtains by step 2: PLC calculate, the numerical value of the upset force obtained and advance drag, and computational methods are: the counter-force that stirring-head is subject to upset force is straight up F _d, the advance drag contrary with direction of feed be F _q; The pressure that four pressure sensors are subject to is F _i(i=1,2,3,4), can be known by dynamic balance,

$F_d=\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{F}_i---\left(1\right)$

The numerical value of upset force can be obtained thus, can know according to equalising torque meanwhile,

$F_{q}L=\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\left|(F_i-\stackrel{\‾}{F})\right|R---\left(2\right)$

Thus, advance F can be obtained _qthe computing formula of drag,

$F_q=\frac{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\left|(F_i-\stackrel{\‾}{F})\right|R}{L}---\left(3\right)$

The upset force data calculated in step 2 are passed to the feed servo motor controlling vertical direction by step 3: PLC, control main shaft to the volume under pressure of workpiece, control the size of upset force with this; The numerical value of the advance drag calculated in step 2 is passed to the feed servo motor in level of control direction, control axis feeding speed, control the size of advance drag with this.

Remarkable result of the present invention is: compact structure, installs additional conveniently, effectively can be applicable to the measurement of various agitating friction soldering equipment upset force and advance drag, controls to be realized by PLC and servomotor, and control accuracy is high, easy to use.

Accompanying drawing explanation

Fig. 1 is the overall structure schematic diagram of device in the present invention;

In figure: 1 stirring-head, 2 preloads screw, 3 main shafts, 4 pressure sensors, 5 main shaft shell;

Detailed description of the invention

Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.

As shown in Figure 1, a kind of friction stir welding lathe upset force and advance drag measure and control device, comprise stirring-head 1; Preload screw 2; Main shaft 3; Pressure sensor 4; Main shaft shell 5, stirring-head 1 is connected with on the left of main shaft 3, main shaft shell 5 is cylindric, be connected by eight equally distributed preloading screws 2 between main shaft 3 with main shaft shell 5, and main shaft 3 does not directly contact with main shaft shell 5, in the middle of leave gap, four pressure sensors 4 are arranged between main shaft 3 and main shaft shell 5, are uniformly distributed in a circumferential direction.By eight preloading screws 2, preloading on four pressure sensors 4 can be adjusted, ensure that pressure sensor 4 has certain preloading before work, and preloading on four pressure sensors 4 be consistent.The operational forces that stirring-head 1 is subject to is not directly delivered in main shaft shell 5 by main shaft 3, but is delivered on pressure sensor 4 by by main shaft 3, then is delivered in main shaft shell 5.Like this, the power on all working power numerical value direction of causing just all is gathered by pressure sensor 4.

Also comprise PLC and feed servo motor, feed servo motor comprises the control feed servo motor of vertical direction and the feed servo motor in level of control direction, the pressure data of four pressure sensor 4 generations is transferred in PLC, PLC convert obtain upset force, advance drag numerical value, pass to and control the feed servo motor of vertical direction and the feed servo motor in level of control direction, control main shaft respectively to the volume under pressure of workpiece and axis feeding speed.

A kind of friction stir welding lathe upset force and advance drag investigating method, comprise the following steps

Step one: stirring-head 1 is subject to the counter-force F of upset force straight up by pressure sensor _dand the advance drag F contrary with direction of feed _qdata be sent in PLC;

The data that step one obtains by step 2: PLC calculate, the numerical value of the upset force obtained and advance drag, and computational methods are: the counter-force that stirring-head 1 is subject to upset force is straight up F _d, the advance drag contrary with direction of feed be F _q; The pressure that four pressure sensors are subject to is F _i(i=1,2,3,4), can be known by dynamic balance,

$F_d=\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{F}_i---\left(1\right)$

The numerical value of upset force can be obtained thus, can know according to equalising torque meanwhile,

$F_{q}L=\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\left|(F_i-\stackrel{\‾}{F})\right|R---\left(2\right)$

Thus, advance F can be obtained _qthe computing formula of drag,

$F_q=\frac{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\left|(F_i-\stackrel{\‾}{F})\right|R}{L}---\left(3\right)$

The upset force data calculated in step 2 are passed to the feed servo motor controlling vertical direction by step 3: PLC, control main shaft to the volume under pressure of workpiece, control the size of upset force with this; The numerical value of the advance drag calculated in step 2 is passed to the feed servo motor in level of control direction, control axis feeding speed, control the size of advance drag with this.

Claims (4)

1. a friction stir welding lathe upset force and advance drag measure and control device, it is characterized in that: comprise stirring-head 1, preload screw 2, main shaft (3), pressure sensor (4), main shaft shell (5), PLC, feed servo motor, stirring-head (1) is connected with main shaft (3) left side, main shaft shell (5) is cylindric, be connected by preloading screw (2) between main shaft (3) with main shaft shell (5), and main shaft (3) does not directly contact with main shaft shell (5), in the middle of leave gap, pressure sensor (4) is arranged between main shaft (3) and main shaft shell (5), the operational forces that stirring-head (1) is subject to is delivered on pressure sensor (4) by main shaft (3), be delivered in main shaft shell (5) again, described feed servo motor comprises the control feed servo motor of vertical direction and the feed servo motor in level of control direction, the pressure data that pressure sensor (4) produces is transferred in PLC, PLC convert obtain upset force, advance drag numerical value, pass to and control the feed servo motor of vertical direction and the feed servo motor in level of control direction, control main shaft respectively to the volume under pressure of workpiece and axis feeding speed.

2. a kind of friction stir welding lathe upset force according to claim 1 and advance drag measure and control device, it is characterized in that: be connected by 8 equally distributed preloading screws (2) between main shaft (3) with main shaft shell (5), by 8 preloading screws (2), preloading on four pressure sensors (4) can be adjusted, ensure that pressure sensor (4) has certain preloading before work, and preloading on four pressure sensors (4) is consistent.

3. a kind of friction stir welding lathe upset force according to claim 1 and advance drag measure and control device, it is characterized in that: have 4 pressure sensors (4) and be arranged between main shaft (3) and main shaft shell (5), be uniformly distributed in a circumferential direction.

4. the friction stir welding lathe upset force of friction stir welding lathe upset force as claimed in claim 1 and advance drag measure and control device and an advance drag investigating method, is characterized in that: comprise the following steps

Step one: stirring-head (1) is subject to the counter-force F of upset force straight up by pressure sensor (4) _dand the advance drag F contrary with direction of feed _qdata be sent in PLC;

The data that step one obtains by step 2: PLC calculate, the numerical value of the upset force obtained and advance drag, and computational methods are: the counter-force that stirring-head (1) is subject to upset force is straight up F _d, the advance drag contrary with direction of feed be F _q; The pressure that four pressure sensors are subject to is F _i(i=1,2,3,4), can be known by dynamic balance,

$F_d=\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{F}_i---\left(1\right)$

The numerical value of upset force can be obtained thus, can know according to equalising torque meanwhile,

$F_{q}L=\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\left|(F_i-\stackrel{\‾}{F})\right|R---\left(2\right)$

Thus, advance F can be obtained _qthe computing formula of drag,

$F_q=\frac{\underset{i=1}{\overset{4}{\mathrm{\Σ}}}\left|(F_i-\stackrel{\‾}{F})\right|R}{L}---\left(3\right)$

The upset force data calculated in step 2 are passed to the feed servo motor controlling vertical direction by step 3: PLC, control main shaft to the volume under pressure of workpiece, control the size of upset force with this; The numerical value of the advance drag calculated in step 2 is passed to the feed servo motor in level of control direction, control axis feeding speed, control the size of advance drag with this.