EP1202404A1 - Method and apparatus for crimping - Google Patents

Abstract

The method involves connecting a crimp contact to a cable by a crimping process in which a crimping tool (12) of a crimping press is movable from a selectable starting position into a selectable crimping position and finally back to the starting position. The movements of a drive motor (2) and of the tool are measured and used to regulate the movement of the tool. Independent claims are also included for an arrangement for making a crimp connection.

Description

The invention relates to a method and a device to control the connection of a contact with a conductor serving crimping process in which a Crimping tool of a crimping press from an initial position in a crimping position and then in a final position is movable.

From the patent US 5 966 806 a device for Making a crimp connection known. On Motor drives an eccentric shaft that carries a slide Crimping tools moved up and down. One by means of Motor shaft driven encoder is used Determining the position of the crimping tool. The one The crimp contact to be connected lies on one fixed anvil, with flags of the crimp contact at the movement of the crimping tool plastically deformed and connect to the conductor. The location of the crimping tool in the crimp area is by means of a Height sensor measured, the sensor signal independent is used by the encoder signal. At the same time, the Crimping force measured based on the motor current. The Measured values are compared with reference values. The Comparison allows a statement about the crimp quality.

A disadvantage of this known device is that although there is an encoder and a height sensor, only a relatively imprecise statement about the crimp quality is feasible because of external influences and elasticities or stiffness of the mechanical drive elements be taken into account.

The invention seeks to remedy this. The invention, as characterized in claim 1, solves the problem to avoid the disadvantages of the known device and to create a procedure and an arrangement in which and in which the crimp quality of a crimp connection improves can be.

The advantages achieved by the invention are in essential to see in the fact that when processing different crimp contacts with different Tool strokes no need to change the crimping press. The crimp height or the crimp stroke is adjustable. Furthermore the control of the crimping press knows the exact time at all times Tool position, with which a simple evaluation of the Crimp force versus crimp stroke is feasible and others on Machines involved in the crimping process can be synchronized can. The crimping press according to the invention works with two Measuring systems by means of which the drive is regulated Position or a crimp height control can be realized. On rotary measuring system is with a linear measuring system coupled. The rotary measuring system allows a high one Positioning dynamics because of no dead times caused by There is play in the gearbox, levers or slide. The linear measuring system enables a precise Crimphöhenregelung. Mechanical deviations of the Crimping press, for example, by the crimping force or can open due to temperature fluctuations the crimp height control is compensated. With the The crimp height control moves the eccentric of the crimping press at most in an angular range between 0 ° and 180 °. The Crimp press stops at bottom dead center and reverses subsequently. Upper and lower dead center can be within this angular range depending on the crimping tool and Crimp contact can be approached as desired. intermediate positions are also possible. To realize these features is only a controlled axis is necessary. The sled lift or the Crimp height is programmable. In addition, the course of the Crimping force can be precisely represented in function of the crimping stroke and usable for quality control.

With the help of the attached figures, the present Invention explained in more detail.

Fig. 1

eine Crimppresse mit einem Werkzeug zur Herstellung einer Crimpverbindung,

Fig. 2

das Werkzeug mit Crimpstempeln in der unteren Totpunktlage,

Fig. 3

das Werkzeug mit Crimpstempeln in der oberen Totpunktlage,

Fig. 4

die Crimppresse mit einem rotativen Messsystem und einem linearen Messsystem,

Fig. 5

eine Anordnungsvariante des linearen Messsystems,

Fig. 6

eine schematische Darstellung der Exzenterbewegung und der Schlittenbewegung,

Fig. 7

eine schematische Darstellung eines Regelkreises zur Crimphöhenregelung,

Fig. 8

Einzelheiten des Regelkreises gemäss Fig. 7 und

Fig. 9 bis Fig. 13

Bahnkurven zum Bewegen des Crimpwerkzeuges.

Show it:

Fig. 1

a crimping press with a tool for producing a crimp connection,

Fig. 2

the tool with crimping dies in the bottom dead center position,

Fig. 3

the tool with crimping dies in the top dead center position,

Fig. 4

the crimping press with a rotary measuring system and a linear measuring system,

Fig. 5

an arrangement variant of the linear measuring system,

Fig. 6

a schematic representation of the eccentric movement and the slide movement,

Fig. 7

1 shows a schematic representation of a control circuit for crimp height control,

Fig. 8

Details of the control loop according to FIGS. 7 and

9 to 13

Path curves for moving the crimping tool.

In Fig. 1, 1 is a stand without a right side wall referred to, on which a motor 2 and on the stator 1 mounted gear 3 is arranged. In addition, on Stand 1 first guides 4 arranged on which a Crimp bear 5 is guided. A driven by the gear 3 Shaft 6 has an eccentric pin 7 at one end. The Crimp bear 5 consists of one in the first guides 4 guided slide 9 and from a tool holder 10 with Holding fork 11. The carriage 9 is in loose connection with the eccentric pin 7, wherein the rotational movement of the Eccentric pin 7 in a linear movement of the slide 9 is implemented. The maximum stroke H of the carriage 9 is through the top dead center and bottom dead center of the Eccentric pin 7 determined. The tool holder 10 is actuated a tool 12 which, together with a tool 12 belonging anvil 13 produces the crimp connection. through an adjustment screw 14, the closing height (shut height) at the bottom dead center of the eccentric pin 7 precisely be adjusted. If there is no setting wheel on tool 12 is provided, can with the adjusting screw 14 Crimp height can be adjusted. (Measure between anvil 13 and Crimp stamp in the bottom dead center of the eccentric pin 7).

2 and 3 show details of the tool 12 for Establishing a crimp connection. One in one Tool housing 20 guided stamp carrier 21 has one Carrier head 22, which is in loose connection with the Holding fork 11 of the tool holder 10 is. At the Stamp carriers are a first crimp stamp 23 and a second crimping die 24 arranged together with the appropriately trained anvil 13 the crimp connections produce. Fig. 2 shows the crimp stamp 23, 24 in the bottom dead center position of the eccentric pin 7, in which the Establishment of the crimp connection is complete. Fig. 3 shows the crimp stamps 23, 24 in the top dead center position of the eccentric pin 7. The maximum punch stroke is by determined the two dead center positions.

4 shows the crimping press with one on the motor 2 arranged rotary measuring system 25, for example a the motor shaft arranged encoder and with a linear Measuring system 26, for example consisting of a measuring head 27 and a glass scale 28. The one with a division provided glass scale 28 is at one end with the Tool holder 10 connected, at the other end the Glass scale 28 in the measuring head 27, which is fixed to the Stand foot 29 is connected. In addition, on Tool holder 10 a force sensor 29.1 for measuring the Crimping force provided.

Fig. 5 shows an arrangement variant of the linear Measuring system 26, wherein the measuring head 27 on one fixed holder 30 is arranged and the glass scale 28 is connected at one end to the carriage 9. At this The opening of the crimping press is not a variant compensated. However, this value is compared to the game in the bearings and rigidity of the gearbox Waves and levers very small.

In a further arrangement variant, the linear Measuring system 26 may be arranged on or in the crimping tool 12. This arrangement enables a very precise detection of the Crimp height.

Fig. 6 shows schematically the eccentric movement and the Carriage movement for a stroke H of, for example, 40 mm, whereby the eccentric pin 7 of 0 ° (top Start position or top dead center) to 180 ° (bottom Stop position or bottom dead center) rotates and back again to 0 °, the path between 180 ° and 360 ° not is driven through. Starting positions deviating from 0 ° as well Intermediate stops (split cycle) on the way between 0 ° and 180 ° are also possible. 180 ° of the eccentric pin 7 corresponds to the minimum crimp height (small crimp contacts with small wire cross sections). So a readjustment is possible, the crimp should be before 180 °. The Reversal point can be before 180 °, which is then the maximum Crimp height corresponds to (large crimp contacts with large Wire cross-sections). Fig. 6 shows different Driving examples of the carriage 9 or the tool 12 with and without stops. Interim stops are made for example to center special crimp contacts or for synchronization with others Wire processing equipment.

Fig. 7 shows a schematic representation of a Control circuit for crimp height control. The control loop exists essentially from an engine position circle with the rotative measuring system 25 and a crimp height control loop the linear measuring system 26. Depending on the size of the processing crimp contact is a signal sc as Setpoint value specified for the crimp height. The signal sc for the setpoint of the crimp height is determined by means of a first Converter 31 in a measure used in the control loop converted. (Transformation of linear values in rotary values). The converted signal is sc ' designated and is at the entrance of a Path curve generator 32 performed. In the further Path curve generator 32 also driving parameters fp, such as for example maximum values for speed, Acceleration or deceleration supplied. At the exit of the Path curve generator 32 has a signal sp as the setpoint available for the motor position. The signal sp will fed to a first summation point 33 at the + input. At the - Input of the first summation point 33 is a signal xp connected as actual value for the motor position. In terms of control technology, the signal xp is used as a control variable denotes and is generated by the rotary measuring system 25. Out the difference between the signal sp and the signal xp arises the signal xwp at the output of the first summation point 33, also called control deviation, which occurs at the input of a Circuit 34 is guided, which is explained in more detail in Fig. 8 is. The signal ym 'is the manipulated variable for the motor 2, on which the rotary measuring system 25 is coupled. In the further the circuit 34, the signals sd as a setpoint for the engine speed, sb as the setpoint for the Motor acceleration and xp as actual value for the Motor position supplied.

The motor 2 drives a mechanism 35 consisting of Gear 3 with eccentric pin 7, guides 4, crimp bear 5 and tool 12. Regarding disturbance for the control loop the stand 1 with the anvil 13 is also closed consider. That with the tool holder 10 and Stator 1 connected linear measuring system 26 generates a Signal xc as actual value for the current position of the Tool holder 10 or for the crimp height. The signal xc the actual value of the crimp height is determined by means of a second Converter 36 in a measure used in the control loop converted. (Transformation of linear values in rotary values). The converted signal is with xc ' designated and is at the - entrance of a second Summation point 37 connected. At the + entrance of the second summation point 37 is the signal sp as the setpoint connected for the motor position. In terms of control technology the signal xc 'referred to as the controlled variable. From the Difference of the signal sp and the signal xc 'arises on Output of the second summation point 37 the signal xwc, also called control deviation, which occurs at the input of a Crimp height controller 38 is performed. The one with, for example Crimp height regulator 38 provided with a PI characteristic generates a signal yc at the output, also called manipulated variable, which is supplied to the circuit 34.

With the crimp height regulator 38 and the linear measuring system 26 are mechanically caused disturbances (opening of the Crimping press, play in the bearings and elasticities or Rigidity of the gearbox, shafts and levers) compensated.

Fig. 8 shows details of the circuit 34, the one Position controller 39, a speed controller 40, a Torque controller 41 and the power electronics 42 for the Motor 2 includes. The xwp signal is at the input of the Position controller 39 is guided. The one with, for example Position controller 39 provided with a P characteristic at the output a signal yp which corresponds to the + input of a third Summation point 43 is supplied. Another + The input is the setpoint signal sd for the engine speed and the actual value signal xd for the engine speed at the input connected. xd is by means of a third, with a D characteristic provided converter 46 generated from the Actual value signal xp for the motor position. At the exit of the The third summation point 43 produces the signal xwd that is guided to the input of the speed controller 40. The one with for example a PI characteristic Speed controller 40 generates a signal yd at the output, which the + Input of a fourth summation point 44 is supplied. At a further + input, the setpoint signal sb 'is for the motor acceleration and the output signal at the input yc of the crimp height regulator 38 connected. The setpoint sb a fourth is used to accelerate the engine Converter 45 in a measure used in the control loop converted. The converted signal is with sb ' designated. At the exit of the fourth summation point 44 creates the signal xwm, which at the input of the Moment controller 41 is performed. The one with, for example PI characteristic provided torque controller 41 generated on Output a signal ym that corresponds to the input of the Power electronics 42 is supplied. According to the The power electronics 42 supplies the motor 2 with signals ym with the manipulated variable ym 'or with energy.

9 to 13 show the trajectory generator 32 generated trajectories as a setpoint for moving the Crimping tool 12 using a broken line and one shown with a dash-dotted line Example. The jerk profile (jerk = jerk, jump function Φ with the values 1, 0, -1)) of FIG. 9 the rounding of the profile of Fig. 11. In the shown Example is the step function such that the Angular speed of the motor at half the Speed increase or speed decrease flattened out what a smooth transition of itself changing angular velocity to constant Guaranteed angular velocity or vice versa. The The carriage stroke depends on the radius R of the eccentric and from a cosine function of the motor rotation angle.

Claims (5)

Method for controlling one of the connection of one Crimp contact with a conductor serving crimping process, in which a crimping tool (12) of a crimping press selectable starting position in a selectable crimping position and then movable backwards to the starting position is. Method according to claim 1,
characterized in that the movement of a motor (2) driving the crimping tool (12) and the movement of the crimping tool (12) are measured and the measured values are used to regulate the movement of the crimping tool (12). Method according to claim 1,
characterized in that a control circuit is provided which regulates the crimp height with the measured values of the motor (2) and with the measured values of the crimping tool (12) or the crimping tool slide (9). Device for producing a crimp connection by means of a motor-driven crimping tool (12),
characterized in that a rotary measuring system (25) is provided for detecting the movement of a motor (2) driving the crimping tool (12) and a linear measuring system (26) is provided for detecting the movement of the crimping tool (12), the measured values being used for a control circuit Regulation of the crimp height are fed. Device according to claim 4,
characterized in that a path curve generator (32) is provided which generates position signals, speed signals and acceleration signals which are connected to the control loop as setpoints, the control loop with the setpoints and the measured values of the rotary measuring system (25) and the measured values of the linear measuring system (26) regulates the crimp height.

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