CN105652142A - Crimping height measuring device and crimping height measuring method - Google Patents

Abstract

The invention aims to proves the measuring precision of the criping height based on a peak load. A crimping height measuring device 100 comprises a load waveform correction part 102 for correcting load waveforms output from a piezoelectric element 110 and a load detection part 101 and outputting the corrected load waveforms; a peak load calculating part 103 used for calculating a peak load P applied to a terminal 51 in a crimpting action according to the corrected load waveforms; and a crimping height calculating part 104 used for calculating the crimping height CH of the crimping terminal 51 made by a terminal crimping device200 based on the peak load P. The load waveform correction part 102 corrects the load waveforms based on the discharge time constant C*R of an amplification circuit determined by the capacitance C of a capacitor of the load detection part 101 and the resistance R of a resistor.

Description

Crimp height determinator and crimp height measuring method

Technical field

The present invention relates to crimp height determinator and crimp height measuring method.

Background technology

When terminal being crimped on electric wire and makes crimping terminal, as judging one of index whether crimped status of crimping terminal is applicable to, it may also be useful to crimp height. Crimp height compresses and is crimped on the height dimension of the crimping terminal of electric wire heart yearn. When crimp height is too big, crimping terminal does not fully compress relative to heart yearn, can produce poor flow in some situations between crimping terminal and electric wire. On the other hand, when crimp height is too little, in some situations heart yearn can due to compress crimping terminal and cut off and electric wire produce broken string bad.

The making of above-mentioned crimping terminal uses terminal press-connection device more. Terminal press-connection device utilizes crimping machine relative to the lifting of anvil, and the terminal of placing on anvil is compressed with the heart yearn of electric wire and the device that crimps. In the making processes of crimping terminal using such terminal press-connection device, when described crimp height is surveyed in operation by hand, it is difficult to measure the crimp height of each crimping terminal continuously and quantitatively. Therefore, such as patent documentation 1 discloses following method: peak load when terminal is crimped on electric wire by detection in terminal press-connection device, it may also be useful to represent the relational expression of the proportionlity of this peak load and crimp height, measures crimp height by calculating.

Prior art literature

Patent documentation

Patent documentation 1: Japanese Patent Laid-Open 2014-22053 publication

Summary of the invention

The problem of the present invention for solving

But, in the measurement accuracy improving crimp height, there is the leeway improved further in the calculation method of the conventional crimp height based on peak load disclosed in patent documentation 1.

The present invention completes in view of above-mentioned situation, its object is to provide a kind of crimp height determinator and crimp height measuring method, it is possible to improve the measurement accuracy of the crimp height based on peak load.

For the scheme dealt with problems

For solving the problem, the crimp height determinator of the present invention is characterised in that, comprise: piezoelectric element, it is arranged between crimping machine and anvil to carry out and terminal and electric wire crimp is crimped the terminal press-connection device that action makes crimping terminal, and the change of the load being attached to described terminal according to described crimping machine and described anvil in described crimping action produces electric charge;Cutting load testing portion, it is voltage by the described charge conversion that described piezoelectric element produces, and the time lapse of the described voltage of conversion exports the time lapse as the described load in described crimping action and load waveform, load waveform correction portion, the described load waveform that its correction exports from described cutting load testing portion also exports correcting load waveform, peak load calculating section, it, according to by correcting load waveform described in the correction of described load waveform correction portion, calculates maximum value and the peak load of the described load being attached to described terminal in described crimping action, and crimp height calculating section, it is based on the described peak load calculated by described peak load calculating section, calculate the crimp height of the described crimping terminal made by described terminal press-connection device, described cutting load testing portion comprises amplification circuit, described amplification circuit has electric capacity and resistance, the described charge charging produced by described piezoelectric element is to described electric capacity, described voltage is exported according to the electric charge being charged to described electric capacity, and utilize described resistance to make the described charge discharge being charged to described electric capacity, described load waveform correction portion is based on the electrical capacity of the described electric capacity by described cutting load testing portion, with constant discharge time of the described amplification circuit that the resistance value of described resistance determines, correct described load waveform.

In addition, in described crimp height determinator preferably, the n-th key element at the described waveform of correcting load represents for ADi (n), n-th key element of described load waveform represents for ADo (n), the electrical capacity of described electric capacity represents for C, the resistance meter of described resistance is illustrated as R, and when the sampling period represents for �� t, described load waveform correction portion uses following severals formulas to correct described load waveform and correcting load waveform described in output.

[formula 1]

$ADi\left(n\right)=ADo\left(n\right)+\frac{\mathrm{\Δ}t}{C\·R}\underset{j=1}{\overset{n}{\Σ}}ADo\left(j\right)$

, at described crimp height representing for CH, described peak load represents for P, and, when constant table is illustrated as a, b, described crimp height calculating section uses following several formulas to calculate described crimp height in addition, in described crimp height determinator preferably:

CH=a �� P+b.

In addition, in described crimp height determinator preferably, the described compression joint mechanism of described terminal press-connection device becomes and links with pressure head, and carry out lifting relative to described anvil together with this pressure head, in lower dead center, the described terminal on described anvil is pressed on the heart yearn of described electric wire, thus make described crimping terminal, the described crimping machine dropping to described lower dead center when described terminal and described electric wire do not exist and described anvil are b in the time interval crimping machine lifting direction, the bottom dead center position of described pressure head represents for DP, when constant table is illustrated as c, described crimp height calculating section uses following several formulas to calculate described crimp height:

CH=a �� P+b

B=DP+c.

In addition, described crimp height determinator is preferably, comprise crimped status detection unit, allow that at least one in lower value compares by the described crimp height calculated by described crimp height calculating section with predetermined crimp height high limit of tolerance value and crimp height, thus judge the quality of the crimped status of the described crimping terminal made by described terminal press-connection device.

Equally, for solving the problem, crimp height measuring method involved in the present invention is characterised in that, comprise: load waveform obtaining step, terminal and electric wire crimp crimped the terminal press-connection device that action makes crimping terminal being arranged between crimping machine and anvil to carry out, and the change being attached to the load of described terminal in described crimping action according to described crimping machine and described anvil produces in the piezoelectric element of electric charge, it is voltage by the described charge conversion produced, the time lapse of the described voltage of conversion is obtained the time lapse as the described load in described crimping action and load waveform, load waveform correction step, corrects in described load waveform obtaining step the described load waveform obtained and exports correcting load waveform, peak load calculates step, according to correcting load waveform described in correction in described load waveform correction step, calculates maximum value and the peak load of the described load being attached to described terminal in described crimping action, crimp height calculates step, the described peak load calculated in step is calculated based on described peak load, calculate the crimp height of the described crimping terminal made by described terminal press-connection device, described load waveform obtaining step uses amplification circuit to obtain described load waveform, described amplification circuit has electric capacity and resistance, the described charge charging produced by described piezoelectric element is to described electric capacity, described voltage is exported according to the electric charge being charged to described electric capacity, and utilize described resistance to make the described charge discharge being charged to described electric capacity, described load waveform correction step is based on constant discharge time of the described amplification circuit determined by described electric capacity and described resistance, correct described load waveform.

In addition, in described crimp height measuring method preferably, the n-th key element at the described waveform of correcting load represents for ADi (n), n-th key element of described load waveform represents for ADo (n), the electrical capacity of described electric capacity represents for C, the resistance meter of described resistance is illustrated as R, and when the sampling period represents for �� t, described load waveform correction step uses following severals formulas to correct described load waveform and correcting load waveform described in output:

[formula 2]

$ADi\left(n\right)=ADo\left(n\right)+\frac{\mathrm{\Δ}t}{C\·R}\underset{j=1}{\overset{n}{\Σ}}ADo\left(j\right).$

, at described crimp height representing for CH, described peak load represents for P, and, when constant table is illustrated as a, b, described crimp height calculates step and uses following several formulas to calculate described crimp height in addition, in described crimp height measuring method preferably:

CH=a �� P+b.

In addition, in described crimp height measuring method preferably, the described compression joint mechanism of described terminal press-connection device becomes and links with pressure head, and carry out lifting relative to described anvil together with this pressure head, in lower dead center, the described terminal on described anvil is pressed on the heart yearn of described electric wire, thus make described crimping terminal, the described crimping machine dropping to described lower dead center when described terminal and described electric wire do not exist and described anvil are b in the time interval crimping machine lifting direction, the bottom dead center position of described pressure head represents for DP, when constant table is illustrated as c, described crimp height calculates step and uses following several formulas to calculate described crimp height:

CH=a �� P+b

B=DP+c.

In addition, in described crimp height measuring method preferably, comprise crimped status determination step, allow that at least one in lower value compares by calculating, by described crimp height, the described crimp height that step calculates with predetermined crimp height high limit of tolerance value and crimp height, thus judge the quality of the crimped status of the described crimping terminal made by described terminal press-connection device.

The effect of invention

Following effect can be obtained: owing to using the waveform of correcting load corrected in the way of the impact of the electric discharge of the amplification circuit reducing cutting load testing portion to calculate peak load, crimp height according to the present invention, so the impact of the various settings of the crimping action of terminal press-connection device can not be subject to, it is possible to improve the measurement accuracy of the crimp height based on peak load.

Accompanying drawing explanation

Fig. 1 is the stereographic map that namely determination object of the crimp height determinator illustrating an embodiment of the invention crimps the summary of terminal and form.

Fig. 2 illustrates that the making of the crimping terminal shown in Fig. 1 uses, and is suitable for the front view that the summary of the terminal press-connection device of the crimp height determinator of an embodiment of the invention is formed.

Pressure head in Fig. 2 is amplified by Fig. 3 with the linking portion crimping machine bracket, illustrates the crimp height determinator of present embodiment and the schematic diagram of the connection relation of terminal press-connection device.

Fig. 4 is the block diagram of the summary formation of the crimp height determinator illustrating an embodiment of the invention.

Fig. 5 is the schematic circuit of the electric charges amplify device of an example of the amplification circuit as the cutting load testing portion in pie graph 4.

Fig. 6 is the schematic circuit of the incorporated amplifier of the amplifier embedded type load cell of other examples of the amplification circuit as the cutting load testing portion in pie graph 4.

Fig. 7 is the figure illustrating the load waveform exported by cutting load testing portion, is that the bottom dead center position of the pressure head illustrating terminal press-connection device is identical and the figure of load waveform when changing the lowering speed of pressure head.

Fig. 8 illustrates when using sample that the different multiple electric wires of conductor amount form crimping terminal, the figure of the corresponding relation of the peak load in the measured value of the crimp height of each sample and the load waveform that exports by cutting load testing portion.

Fig. 9 is the load waveform before the correction illustrating that enforcement load waveform correction portion carries out and the figure of the waveform of correcting load after enforcement correction.

Figure 10 illustrates the correcting load oscillogram exported by load waveform correction portion, is that the bottom dead center position of the pressure head illustrating terminal press-connection device is identical and the figure of the waveform of correcting load when changing the lowering speed of pressure head.

When Figure 11 illustrates that multiple electric wires that use conductor amount is different form the sample crimping terminal, the figure of the measured value of the crimp height of each sample and the corresponding relation by the peak load in the waveform of correcting load of load waveform correction portion output.

Figure 12 is the figure of the relation of the set(ting)value of the lower dead center illustrating pressure head and the constant a calculating the transform used of crimp height.

Figure 13 is the schema illustrating the crimp height mensuration process implemented by the crimp height determinator of present embodiment.

The explanation of label

100 crimp height determinators

101 cutting load testing portions

111 electric charges amplify devices (cutting load testing portion, amplification circuit)

112 electric capacity

113 resistance

115 incorporated amplifiers (cutting load testing portion, amplification circuit)

116 electric capacity

117 resistance

102 load waveform correction portions

103 peak load calculating sections

104 crimp height calculating sections

105 crimped status detection units

110 pressure transmitters (piezoelectric element)

200 terminal press-connection devices

11 pressure heads

14 crimping machines

17 anvils

51 crimping terminals

61 electric wires

A1, B1 load waveform

A2, B2 be correcting load waveform

C electrical capacity

R resistance value

C R constant discharge time

P peak load

CH crimp height

S02 load waveform obtaining step

S03 load waveform correction step

S04 peak load calculates step

S05 crimp height calculates step

Embodiment

The crimp height determinator of the present invention and the enforcement mode of crimp height measuring method are described based on accompanying drawing below. In addition, in figures in the following, identical or suitable part marks identical Reference numeral, and its explanation does not repeat.

[enforcement mode]

First, with reference to Fig. 1��3, illustrate that namely the determination object of the crimp height determinator 100 of present embodiment crimps terminal 51, and it is suitable for the terminal press-connection device 200 of the crimp height determinator 100 of present embodiment. Fig. 1 is the stereographic map that namely determination object of the crimp height determinator illustrating an embodiment of the invention crimps the summary of terminal and form. Fig. 2 illustrates that the making of the crimping terminal shown in Fig. 1 uses, and is suitable for the front view that the summary of the terminal press-connection device of the crimp height determinator of an embodiment of the invention is formed. Pressure head in Fig. 2 is amplified by Fig. 3 with the linking portion crimping machine bracket, illustrates the crimp height determinator of present embodiment and the schematic diagram of the connection relation of terminal press-connection device.

Crimping terminal 51 shown in Fig. 1 crimps as terminal and is arranged on electric wire 61. Electric wire 61 comprises the covering portion 62 of the heart yearn 60 of electroconductibility, the insulativity of this heart yearn 60 coated. Multiple wire is reversed (tying up) and forms by heart yearn 60, and cross-sectional shape is formed as circular. The metal that the wire forming heart yearn 60 such as has electroconductibility by copper, copper alloy, aluminium or aluminium alloy etc. is formed. Covering portion 62 is made up of the synthetic resins of insulativity. Electric wire 61, before being provided with crimping terminal 51, is in the covering portion 62 removing a part, the state that the heart yearn 60 of this part exposes.

Bending for the metal sheet of electroconductibility grade is formed by crimping terminal 51. Crimping terminal 51 is so-called female end that electrical contacts 53 described later is formed tubular. Crimping terminal 51 comprises: for the electric wire connection section 52 being connected with electric wire 61; For the electrical contacts 53 being connected with other terminal fittings; By the diapire 54 that these electric wire connection sections 52 and electrical contacts 53 are connected mutually.

Electric wire connection section 52 comprises one pair of electric wire and compresses pin 55, to heart yearn compression pin 50. In addition, a compression pin that heart yearn compression pin 50 is recorded for this specification sheets. One pair of electric wire compresses pin 55 and vertically arranges from two edge of diapire 54 respectively. Electric wire compresses pin 55 by bending to diapire 54, thus clips the electric wire 61 with covering portion 62 between diapire 54.

One pair of heart yearn compresses pin 50 and vertically arranges from two edge of diapire 54 respectively. Heart yearn compresses pin 50 by bending to diapire 54, thus clips the heart yearn 60 exposed between diapire 54.So, one heart yearn 60 is compressed by heart yearn compression pin 50. Herein, in the present embodiment, as shown in Figure 1, in electric wire connection section 52, the size of the vertical setting direction compressing the diapire 54 of pin 50 from the heart yearn the state compressed by heart yearn 60 is called " crimp height ". Crimp height is when the heart yearn using terminal press-connection device 200 that terminal is crimped on electric wire, for judging one of index whether terminal is applicable to using relative to the impaction state of electric wire.

Like this, by compression pin 50,55 is bent towards diapire 54, heart yearn 60 and electric wire 61 are compressed, thus crimp the crimping action that terminal 51 is crimped on electric wire 61 and the terminal press-connection device 200 shown in Fig. 2,3 can be utilized to implement.

Terminal press-connection device 200 shown in the front view of Fig. 2 has framework 1. This framework 1 comprises the side plate 3,3 of substrate 2 and both sides thereof. Upper back (inside the paper of Fig. 2) at two side plates 3,3 is fixed with the servomotor (not shown) with speed reduction unit. Output shaft axle at speed reduction unit has filled the plectane 7 with eccentric pin (bent axle) 8, is articulated with slip block 9 at eccentric pin 8. In addition, about servomotor and the link structure of plectane 7 and the driving control system of servomotor, have open in detail in described patent documentation 1 (Japanese Unexamined Patent Publication 2014-22053 publication).

Slip block 9 be loaded in sliding freely be installed on pressure head 11 baffle plate 10, between 10a. Slip block 9 utilizes the rotation of plectane 7 and (direction, paper left and right of Fig. 2) slides in the horizontal direction between baffle plate 10,10a. Pressure head 11 utilizes the rotation of plectane 7 and slip block 9 mobile in lead direction (the paper upper and lower of Fig. 2 to) of hanging down together with baffle plate 10,10a. This pressure head 11 is loaded in the pressure head set by the internal surface of two side plates 3,3 sliding freely in the vertical direction of lead and guides part 12,12. That is, plectane 7, slip block 9, baffle plate 10,10a, pressure head 11 and pressure head guide part 12 to form piston-crank mechanism.

As shown in Figure 2,3, pressure head 11 has coupling recess 13 in bottom. The engagement projection 16 of crimping machine bracket 15 detachably it is mounted with in this coupling recess 13. Crimping machine bracket 15 has this engagement projection 16 in the upper end in the vertical direction of lead, and the lower end in the vertical direction of lead is provided with crimping machine 14.

As shown in Figure 2, anvil 17 with crimp machine 14 to putting. The fixing anvil on a substrate 2 of anvil 17 installs platform 24. In addition, as shown in Figure 3, pressure transmitter 110 (being hereafter also labeled as " piezoelectric element 110 ") it is provided with at pressure head 11 between machine bracket 15 with crimping. This pressure transmitter 110 is connected with the crimp height determinator 100 of present embodiment. And, utilize the output of this pressure transmitter 110, in crimp height determinator 100 from crimping machine 14 upper and lower to load (below the value of this load being called load value) be detected, according to this load value detected out calculate crimping terminal 51 crimp height. In addition, this load is from the reactive force of crimping terminal 51 and the power being applied to crimping terminal 51 in crimping operation. It is described later pressure transmitter 110 and the details of crimp height determinator 100.

, as shown in Figure 2, in addition terminal press-connection device 200 comprises the terminal feeding device 18 of known formation. This terminal feeding device 18 comprises: the terminal of the crimping terminal 51 supporting not shown chain shape guides part 19; Terminal presses casting die 20; At end, there is the terminal transmission arm 22 that terminal transmits pawl 21; The flexible shake connecting rod 23 etc. of arm 22 is transmitted with making this terminal.Shake connecting rod 23 shakes in front and back along with decline, the rising of pressure head 11, utilizes terminal transmission pawl 21 will crimp terminal 51 and sends into one by one on anvil 17. In addition, anvil 17 can install the operation of the handle 25 of platform 24 by anvil, it is possible to make the position adjustment relative to crimping machine 14, remove, replacing etc. easily.

Terminal press-connection device 200 is by the positive reverse rotation of control servomotor such that it is able to via described piston-crank mechanism, makes pressure head 11 namely crimp machine 14 and declines and rise. And, by crimping the decline of machine 14 and rising, to be configured between this crimping machine 14 with anvil 17 crimp terminal 51 and electric wire 61 crimps.

Therefore, the upside closed position (top dead center position) of pressure head 11 and downside closed position (bottom dead center position) determine according to the positive reverse rotation amount determined in the servocontrol of servomotor. Like this, the bottom dead center position of pressure head 11 determines according to the servocontrol of servomotor, not necessarily consistent with the bottom dead center position on the structure of the piston-crank mechanism that pressure head 11 can arrive. Therefore, in order to the lower dead center on the structure that can arrive with pressure head 11 is distinguished, also referred to as " servo lower dead center " when the lower dead center of the pressure head 11 hereinafter servocontrol according to servomotor determined has. In addition, in the present embodiment, when being only labeled as " lower dead center of pressure head 11 ", the lower dead center on the structure of Bu Shi piston-crank mechanism, and refer to this servo lower dead center. The bottom dead center position of pressure head 11 is when the more little value in the position more low (more close to anvil 17) of terminal press-connection device 200, when position more high (from anvil 17 more away from) more big value.

Like this, terminal press-connection device 200 can utilize the servocontrol of servomotor to control arbitrarily the bottom dead center position of pressure head 11, consequently, it is possible to adjust arbitrarily the closest point of approach between the crimping machine 14 of the bottom dead center position of pressure head 11 and anvil 17. And, it is configured to according to this closest point of approach, it is possible to the size of the crimp height of the crimping terminal 51 that control makes. In addition, terminal press-connection device 200 is configured to the lowering speed that the servocontrol according to servomotor can control arbitrarily pressure head 11, consequently, it is possible to the making amount of the per unit time of control crimping terminal 51.

Next with reference to Fig. 4��6, the formation of the crimp height determinator 100 of present embodiment is described. Fig. 4 is the block diagram of the summary formation of the crimp height determinator illustrating an embodiment of the invention. Fig. 5 is the schematic circuit of the electric charges amplify device of an example of the amplification circuit as the cutting load testing portion in pie graph 4. Fig. 6 is the schematic circuit of the incorporated amplifier of the amplifier embedded type load cell of other examples of the amplification circuit as the cutting load testing portion in pie graph 4.

Crimp height determinator 100s is such as lower device: as described in terminal press-connection device 200, carry out in the middle of crimping action that terminal 51 is crimped with electric wire 61 between crimping machine 14 with anvil 17, detection crimping machine 14 and anvil 17 are attached to the load of terminal 51, the crimp height of the crimping terminal 51 made by terminal press-connection device 200 is calculated based on this load value, and judge the quality of crimped status based on the value of this crimp height calculated, export its result of determination. Crimp height determinator 100 does not directly count the crimp height surveying the crimping terminal 51 made by terminal press-connection device 200, but estimates according to load value. In addition, the crimp height determinator 100 of present embodiment can show as the general address of same device, i.e. crimp force watch-dog (CFM), crimp height management devices etc.

As shown in Figure 4, crimp height determinator 100 comprises piezoelectric element 110, cutting load testing portion 101, load waveform correction portion 102, peak load calculating section 103, crimp height calculating section 104, crimped status detection unit 105.

Piezoelectric element 110 is the passive element that make use of piezoelectric effect, and the power being attached to piezoelectrics is converted to electric charge. In the present embodiment, piezoelectric element 110 is described above, being located at the terminal press-connection device 200 making crimping terminal 51, in the crimping action crimped with electric wire 61 by terminal 51 between crimping machine 14 with anvil 17, the change of the load being attached to terminal 51 according to crimping machine 14 and anvil 17 produces charge Q_i(t) (with reference to Fig. 5 etc.).

The charge Q that cutting load testing portion 101 produces by piezoelectric element 110_iT () is converted to voltage V_O(t). The amplification circuit that the output of piezoelectric element 110 is specifically amplified by cutting load testing portion 101. Such as shown in Figure 5, cutting load testing portion 101 can comprise the electric charges amplify device 111 separated and form with piezoelectric element 110 and forms. Electric capacity 112, resistance 113 and operational amplifier 114 are connected in parallel by electric charges amplify device 111, make the charge Q that piezoelectric element 110 produces_iT () charging is to electric capacity 112, its quantity of electric charge surveyed by meter.

In addition, such as also can amplifier embedded type load cell as is known such, the structure etc. of built-in amplification circuit in sensor, piezoelectric element 110 and cutting load testing portion 101 are formed integratedly as the device of monomer. In this case, as shown in Figure 6, cutting load testing portion 101 can contain incorporated amplifier 115 and form, and incorporated amplifier 115 is built in the sensor component comprising piezoelectric element 110. Incorporated amplifier 115 is the differentiating circuit with electric capacity 116 and resistance 117, for input voltage (output of piezoelectric element 110) V_iT () uses this differentiating circuit to carry out inter-process.

In addition, cutting load testing portion 101 is by like this by the voltage V amplifying circuit conversion_OT the time lapse of () exports the time lapse as the load in crimping action and load waveform. Cutting load testing portion 101 comprises and is converted to the A/D converter of digital voltage signal and form by from amplifying the analog voltage signal that circuit exports, and exports using the digital voltage signal of predetermined sampling period discretize as load waveform.

Load waveform correction portion 102 corrects the load waveform exported from cutting load testing portion 101 and exports correcting load waveform. Load waveform correction portion 102 carrys out correcting load waveform based on constant discharge time amplifying circuit (the electric charges amplify device 111 of Fig. 5 or the incorporated amplifier 115 of Fig. 6), and this, constant was determined by the resistance value R of the electrical capacity C of the electric capacity (electric capacity 112 of Fig. 5 or the electric capacity 116 of Fig. 6) in cutting load testing portion 101 and resistance (resistance 113 of Fig. 5 or the resistance 117 of Fig. 6) discharge time. In addition, the treatment for correcting that load waveform correction portion 102 carries out it is described later.

Peak load calculating section 103, according to the correcting load waveform corrected by load waveform correction portion 102, calculates maximum value and the peak load P (with reference to Fig. 7,9,10) of the load being attached to terminal 51 in crimping action.

Crimp height calculating section 104, based on the peak load P calculated by peak load calculating section 103, calculates the crimp height CH of the crimping terminal 51 made by terminal press-connection device 200.

Herein, the deriving method of the crimp height of crimp height calculating section 104 is described. In the crimping action of terminal press-connection device 200, the lower dead center (crimping machine 14 is near the point of anvil 17) being applied to the crimping machine 14 that the load crimping terminal 51 is roughly positioned at bottom dead center position at pressure head 11 from crimping machine 14 and anvil 17 welcomes peak value (peak load).

In addition, crimping machine 14 and the interval of anvil 17 under state that the crimp height crimping terminal 51 is positioned at lower dead center according to crimping machine 14, that terminal 51 is pressed on heart yearn 60 determine. And, crimping machine 14 under this state and the interval of anvil 17 are compared more big with minimum interval when there are not terminal 51 and heart yearn 60 when between crimping machine 14 and the anvil 17 of lower dead center, namely the crimp height crimping terminal 51 is more big, and the load being applied to crimping terminal 51 from crimping machine 14 and anvil 17 is more big.

Therefore, between the crimp height and the peak load being applied to crimping terminal 51 from the machine that crimps 14 and anvil 17 that drop to lower dead center of crimping terminal 51, there is proportionlity. Thus known, use and it is applied to the peak load (P) of crimping terminal 51 from the crimping machine 14 and anvil 17 that drop to lower dead center, crimp the minimum interval b of machine 14 and anvil 17, it is possible to the transform being made up of following (1), (2) formula calculates the crimp height (CH) of crimping terminal 51.

CH=a �� P+b (1)

B=DP+c (2)

Wherein, a, b, c are constants, and DP is the bottom dead center position (servo lower dead center) of pressure head 11.

Constant a, b, c that described transform comprises such as can obtain as follows: the sample of the crimping terminal 51 that the sample of the crimping terminal 51 formed with the use of multiple electric wires 61 that the amount (conductor amount) of heart yearn 60 is different, bottom dead center position (servo lower dead center) DP changing pressure head 11 are formed, utilizes the methods such as known least square method to carry out identification. In addition, about the discrimination method of constant a, b, c, by open in detail in above-mentioned patent documentation 1 (Japanese Unexamined Patent Publication 2014-22053 publication).

Crimp height calculating section 104 stores constant a, b, c of obtaining in advance like this, with the information of the bottom dead center position DP of the pressure head 11 when making crimping terminal 51, use the information of the peak load P inputted from peak load calculating section 103, utilize described transform to calculate crimp height CH.

Crimped status detection unit 105, based on the crimp height calculated by crimp height calculating section 104, judges the quality of the crimped status (terminal 51 is relative to the impaction state of electric wire 61) of the crimping terminal 51 made by terminal press-connection device 200. The crimp height that crimped status detection unit 105 such as calculates by comparing and predetermined crimp height high limit of tolerance value and crimp height allow at least one in lower value, thus judge crimped status.

Herein, the major portion of crimp height determinator 100 can comprise CPU (CentralProcessingUnit physically, central processing unit), main storing unit and RAM (RandomAccessMemory, random access memory) and ROM (ReadOnlyMemory, read-only storage), input unit and the keyboard computer systems such as the secondary storage device such as module, hard disk that namely communicate with data transmitting/receiving equipments such as the take-off equipment such as input unit, indicating meter, network interface card such as mouses form. In each function of the crimp height determinator 100 shown in Fig. 4, particularly by making, the hardware such as CPU, RAM read in predetermined computer software to each function of load waveform correction portion 102, peak load calculating section 103, crimp height calculating section 104, crimped status detection unit 105, thus make communication module, input unit, take-off equipment action under the control of cpu, and carry out the reading of data and write realizing in RAM, secondary storage device. In addition, the function in cutting load testing portion 101 is as mentioned above, it is necessary, amplify circuit by the incorporated amplifier 115 of the electric charges amplify device 111 of Fig. 5, Fig. 6 etc. and A/D converter realizes.

Herein, investigate in the formation of described crimp height determinator 100, the load waveform detected out by piezoelectric element 110 and cutting load testing portion 101.

Fig. 7 is the figure illustrating the load waveform exported by cutting load testing portion, is that the bottom dead center position of the pressure head illustrating terminal press-connection device is identical and the figure of load waveform when changing the lowering speed of pressure head. The longitudinal axis of Fig. 7 represents load value (crimp force) (kN) that export by cutting load testing portion 101, and the transverse axis of Fig. 7 represents the time (msec). In Fig. 7, load waveform when the lowering speed of the pressure head 11 of terminal press-connection device 200 being set as at a high speed is shown with the figure line A1 (being hereafter also denoted as " high speed load waveform A1 ") of solid line, with the figure line B1 (being hereafter also denoted as " low speed load waveform B 1 ") of dotted line, the load waveform when lowering speed of the pressure head 11 of terminal press-connection device 200 is set as low speed is shown. The bottom dead center position of the pressure head 11 of the terminal press-connection device 200 of figure line A1, B1 is all set as identical.

Along with the change of lowering speed of the pressure head 11 of terminal press-connection device 200, the track of pressure head 11 also can change. Therefore, as shown in Figure 7, along with the Orbit revolutionary of pressure head 11, load waveform A1, B1 when the lowering speed of pressure head 11 is different are also along with time variations. Specifically, low speed load waveform B 1 is compared with high speed load waveform A1, and the time point produced from crimp force is elongated to the required time arriving peak load.

Incidentally, as mentioned above, it is necessary, the bottom dead center position of the pressure head 11 of the terminal press-connection device 200 of the high speed load waveform A1 shown in Fig. 7 and low speed load waveform B 1 is all set as identical. That is, the measured value of the crimp height of the crimping terminal 51 made under two conditions is roughly the same. In addition, it is believed that due to load waveform peak load the distance that pressure head 11 drops to bottom dead center position and crimping machine 14 and anvil 17 closest to time produce, therefore when making the bottom dead center position of pressure head 11 identical, peak load is also roughly the same. But, as shown in Figure 7, in the high speed load waveform A1 exported by cutting load testing portion 101 and low speed load waveform B 1, although crimp height does not change, but see the deviation delta X of a great deal of at peak load. Specifically, the peak load P of low speed load waveform B 1_LRelative to the peak load P of high speed load waveform A1_H, detect out the value that the amount of just deviation delta X is so little.

Fig. 8 illustrates when using sample that the different multiple electric wires of conductor amount form crimping terminal, the figure of the corresponding relation of the peak load in the measured value of the crimp height of each sample and the load waveform that exports by cutting load testing portion. The longitudinal axis of Fig. 8 represents measured value (C/H) (mm) of the crimp height of each sample, and the transverse axis of Fig. 8 represents the peak load (kN) in the load waveform exported when making each sample by cutting load testing portion 101. In addition, in Fig. 8, draw the distribution (distributing during high speed) of when lowering speed of the pressure head 11 of terminal press-connection device 200 being set as at a high speed, crimp height and peak load with the mark of black diamonds, draw the distribution (distributing during low speed) of when lowering speed of the pressure head 11 of terminal press-connection device 200 is set as low speed, crimp height and peak load with the mark that white is circular. Further, being illustrated with the figure line C1 of dotted line by the near linear of distribution during high speed, during low speed, the near linear of distribution illustrates with the figure line D1 of long and short dash line.

As shown in Figure 8, the sample using multiple electric wires 61 that conductor amount (heart yearn number) is different to make crimping terminal 51, when observing the corresponding relation of crimp height and peak load, along with the change of lowering speed of the pressure head 11 of terminal press-connection device 200, characteristic can change. Specifically, the obliquity of the near linear C1 of distribution when the obliquity of the near linear D1 of distribution is greater than high speed during low speed. In addition, the obliquity of this near linear is equivalent to the constant a calculating the transform (1) used of crimp height in crimp height calculating section 104. Namely, when the setting of the lowering speed of the pressure head 11 of terminal press-connection device 200 is different, transform (1), constant a, b, the c of (2) that the calculating of crimp height uses also need to use different constants (with reference to Figure 12).

Like this, as described with reference to Figure 7, 8, in load waveform A1, the B1 exported by cutting load testing portion 101, the lowering speed of the pressure head 11 of terminal press-connection device 200 is low speed more, although the crimp height of the reality of the crimping terminal 51 made is identical, also there is the tendency that peak load reduces. Therefore, for calculating the transform (1) of crimp height, (2) need each kind of lowering speed of the pressure head 11 to terminal press-connection device 200 to come indivedual identification constant a, b, c, this can expend time. Therefore, the crimp height determinator 100 of present embodiment is configured to: as mentioned above, the load waveform correction portion 102 correcting load waveform A1, B1 of exporting from cutting load testing portion 101 and export correcting load waveform A2, B2 (with reference to Figure 10) by comprising, utilize correcting load waveform A2, B2 of correcting by load waveform correction portion 102, thus the impact of the lowering speed of the pressure head 11 of terminal press-connection device 200 can not be subject to, it is possible to derive peak load, crimp height accurately.

Next, the correction method of the load waveform that load waveform correction portion 102 carries out is described in detail.

As mentioned above, it is necessary, in load waveform A1, the B1 exported by cutting load testing portion 101, the lowering speed of the pressure head 11 of terminal press-connection device 200 is low speed more, although the crimp height of the reality of the crimping terminal 51 made is identical, also there is the tendency that peak load reduces. First, investigate this reason.

As shown in Figure 5,6, for the electric charges amplify device 111 of Fig. 5, the amplification circuit that cutting load testing portion 101 comprises is configured to: by the charge Q produced by piezoelectric element 110_iT () is charged to electric capacity 112, according to the charge Q being charged to electric capacity 112_OT () carrys out output voltage V_O(t), and utilize resistance 113 to make the charge Q being charged to electric capacity 112_OT () is discharged. Therefore, in 1 crimping action of terminal press-connection device 200, it is charged to the charge Q of electric capacity 112_OT () is discharged based on constant discharge time of electric charges amplify device 111, the meter of the crimping action below carrying out when clear sky is surveyed. Constant discharge time of electric charges amplify device 111 is the value of the resistance value R decision of the electrical capacity C by electric capacity 112 and resistance 113, specifically the long-pending C R of electrical capacity C and resistance value R.

Herein, as shown in the high speed load waveform A1 of Fig. 7, when the lowering speed of the pressure head 11 of terminal press-connection device 200 is set as at a high speed, owing to the required time of 1 crimping action of terminal press-connection device 200 is shorter, so thinking the charge Q being charged to electric capacity 112_OT the discharge capacity of () is fewer. On the other hand, as shown in the low speed load waveform B 1 of Fig. 7, when the lowering speed of the pressure head 11 of terminal press-connection device 200 is set as low speed, owing to the required time of 1 crimping action of terminal press-connection device 200 is long, so compared with high speed load waveform A1, being charged to the charge Q of electric capacity 112_OT the electric discharge quantitative change of () is many, its result is, it is believed that the impact of electric discharge is relatively strong, the peak load P of low speed load waveform B 1_LRelative to the peak load P of high speed load waveform A1_H, detect out the value that the amount of just deviation delta X is so little.

The incorporated amplifier 115 of Fig. 6 due to also same with the electric charges amplify device 111 of Fig. 5 be the formation with electric capacity 116 and resistance 117, so think be subject to based on incorporated amplifier 115 discharge time constant C R the impact of electric discharge of electric capacity 116.

Therefore, in the present embodiment, by considering constant C R discharge time of the amplification circuit (the electric charges amplify device 111 of Fig. 5, the incorporated amplifier 115 of Fig. 6) that cutting load testing portion 101 comprises, correcting load waveform A1, B1 in the way of offsetting discharge capacity such that it is able to reduce the impact of the electric discharge that peak load is subject to. Next, corrector for carrying out such correction is described.

First, it is contemplated that the electric charges amplify device 111 of Fig. 5. In the schematic circuit of Fig. 5, the relation of following (3)��(5) formula is set up.

[formula 3]

Q_i(t)=Q_o(t)+��i(t)dt��(3)

$\frac{Q_o\left(t\right)}{C}+V_o\left(t\right)=\mathrm{0...}\left(4\right)$

R��i(t)+V_o(t)=0 ... (5)

Wherein, Q_iT () is the quantity of electric charge produced at piezoelectric element 110 due to load, Q_OT () is the quantity of electric charge being stored in electric capacity 112, i (t) is the current value flowing through resistance 113, and C is the electrical capacity of electric capacity 112, and R is the resistance value of resistance 113, V_OT () is output voltage.

Described (3)��(5) formula can be utilized to derive following (6) formula.

[formula 4]

$-\frac{Q_i\left(t\right)}{C}=V_o\left(t\right)+\frac{1}{C\·R}\∫V_o\left(t\right)dt\mathrm{...}\left(6\right)$

Wherein, the left side of described (6) formula be never be subject to electric capacity 112 electric discharge impact piezoelectric element 110 to the time waveform of the input voltage of electric charges amplify device 111. The right is constant C R discharge time using electric charges amplify device 111, on the output voltage V of the electric discharge impact being subject to electric capacity 112_OT () implements the time waveform of correction. That is, (6) formula is by output voltage V_OT () implements to employ the correction of constant C R discharge time, thus be equivalent to calculate the corrector of the original load waveform (input voltage) of the electric discharge impact not being subject to electric capacity 112.

Next, it is contemplated that the incorporated amplifier 115 of Fig. 6. In the schematic circuit of Fig. 6, the relation of following (7), (8) formula is set up.

[formula 5]

$Vi\left(t\right)-\frac{1}{C}\∫i\left(t\right)dt-V_O\left(t\right)=\mathrm{0...}\left(7\right)$

V_O(t)=R i (t) ... (8)

Herein, V_iT () is from piezoelectric element 110 to the input voltage of incorporated amplifier 115, V_OT () is the output voltage of incorporated amplifier 115, i (t) is the current value flowing through resistance 117, and C is the electrical capacity of electric capacity 116, and R is the resistance value of resistance 117.

Following (9) formula can be derived according to described (7), (8) formula.

[formula 6]

$Vi\left(t\right)=V_O\left(t\right)+\frac{1}{C\·R}\∫V_O\left(t\right)dt\mathrm{...}\left(9\right)$

(9) formula is by output voltage V_OT () implements to employ the correction of constant C R discharge time, thus be equivalent to calculate original load waveform (the input voltage V of the electric discharge impact not being subject to electric capacity 116_i(t)) corrector.

Based on the corrector i.e. corrector of the incorporated amplifier 115 of (6) formula, Fig. 6 i.e. (9) formula of the electric charges amplify device 111 of Fig. 5, and the output considering cutting load testing portion 101 changed by A/D after the point of digital voltage signal, the corrector used in load waveform correction portion 102 can represent as following (10) formula.

[formula 7]

$\begin{array}{c}ADi\left(n\right)=ADo\left(n\right)\frac{\mathrm{\Δ}t}{C\·R}\underset{j=1}{\overset{n}{\Σ}}ADo\left(j\right)\\ n=1,2,\mathrm{...},N-1,N\end{array}\mathrm{...}\left(10\right)$

Wherein, ADi (n) is the n-th key element of correcting load waveform, and ADo (n) is the n-th key element of load waveform, and C is the electrical capacity of electric capacity 112,116, and R is the resistance value of resistance 113,117, and �� t is the sampling period. Load waveform ADo (n) and all of ADi (n) want prime number to be N. Namely, (10) formula of utilization, n-th key element ADo (n) of load waveform is added the n-th key element ADi (n) being used as correcting load waveform and exports with correction amount, wherein, this correction amount is based on by this key element ADo (n) with compared with this key element ADo (n), on the time, the summation of preceding other key element ADo (1)��ADo (n-1) carries out the value after except calculation with constant discharge time.

Fig. 9 is the figure of the waveform of correcting load after the load waveform before the correction illustrating that enforcement load waveform correction portion carries out, enforcement correction. The longitudinal axis of Fig. 9 represents the value (AD value) of the digital voltage signal inputing to load waveform correction portion 102, and the transverse axis of Fig. 9 represents the time. In Fig. 9, with the figure line of solid line, the load waveform before correction is shown, with the figure line of dotted line, the correcting load waveform after correction is shown. That is, the solid line plot of Fig. 9 is the waveform of the ADo (n) of (10) formula, the dotted line figure line of Fig. 9 be the ADi (n) of (10) formula waveform namely (n=1,2 ... N-1, N). As shown in Figure 9, correcting load waveform is along with the process of time, is increased for the load waveform correction amount before correction. This illustrates and can suitably suppress: according to (10) formula, based on constant C R discharge time, the impact of time more electric discharge through more big cutting load testing portion 101. Thus, can extract, in correcting load waveform, the value being greater than peak load.

Figure 10 illustrates the correcting load oscillogram exported by load waveform correction portion, is that the bottom dead center position of the pressure head illustrating terminal press-connection device is identical and the figure of the waveform of correcting load when changing the lowering speed of pressure head. When Figure 11 illustrates that multiple electric wires that use conductor amount is different form the sample crimping terminal, the figure of the measured value of the crimp height of each sample and the corresponding relation by the peak load in the waveform of correcting load of load waveform correction portion output. Main composition, the condition of Figure 10 and Figure 11 are same with Fig. 7 and Fig. 8 respectively. Figure 10,11 is from Fig. 7,8 different differences: adopts the correcting load waveform exported by load waveform correction portion 102, replaces the load waveform exported by cutting load testing portion 101.

In Figure 10, with the figure line A2 (being hereafter also designated as " having corrected high speed load waveform A2 ") of solid line, the correcting load waveform corrected by the high speed load waveform A1 of Fig. 7 in load waveform correction portion 102 is shown, with the figure line B2 (being hereafter also designated as " having corrected low speed load waveform B 2 ") of dotted line, the correcting load waveform low speed load waveform B 1 of Fig. 7 corrected in load waveform correction portion 102 is shown. In addition, same with Fig. 8 in Figure 11, the near linear of distribution when illustrating high speed with the figure line C2 of dotted line, the near linear of distribution when illustrating low speed with the figure line D2 of long and short dash line.

As shown in Figure 10, in load waveform correction portion 102 correction the load waveform A2 of correction high speed and corrected in low speed load waveform B 2, the deviation delta X of deviation delta Y and Fig. 7 of peak load compares and fully reduces. Specifically, the peak load P of low speed load waveform B 2 has been corrected_LCIt is corrected as the peak load P being increased to correcting high speed load waveform A2_HCEquivalent level. That is, roughly the same with the measured value of crimp height corresponding, peak load P_LC��P_HCAlso roughly the same. Namely, with the use of correcting load waveform A2, B2 of correction in load waveform correction portion 102, thus when the set(ting)value of the lower dead center of the pressure head 11 of terminal press-connection device 200 is identical, the impact that can not be subject to the lowering speed of the pressure head 11 of terminal press-connection device 200, calculates roughly the same peak load P_LC��P_HC��

In addition, as shown in figure 11, by calculating peak load according to the waveform of correcting load of correction in load waveform correction portion 102, thus when observing the corresponding relation of crimp height and peak load, not depending on the change of the lowering speed of the pressure head 11 of terminal press-connection device 200, characteristic is certain.Specifically, during low speed, the obliquity of the near linear D2 of distribution is corrected as roughly the same with the obliquity of the near linear C2 of distribution during high speed. As mentioned above, it is necessary, the obliquity of this near linear is equivalent to the constant a calculating the transform (1) used of crimp height in crimp height calculating section 104. That is, when the setting of the lowering speed of the pressure head 11 of terminal press-connection device 200 is different, transform (1), constant a, b, the c of (2) that the calculating of crimp height uses can use common constant.

Figure 12 is the figure of the relation of the set(ting)value of the lower dead center illustrating pressure head and the constant a calculating the transform used of crimp height. The longitudinal axis of Figure 12 represent crimp height calculate use transform (1), (2) constant a (herein for " rate constant a (mm/kN) "), the transverse axis of Figure 12 represents the set(ting)value DP (mm) of the lower dead center of the pressure head 11 of terminal press-connection device 200. In Figure 12, in usage load waveform correction portion 102, the value of the rate constant a that correcting load waveform A2, B2 of correction carry out parameter identification and derive is drawn (being designated as in figure " after correction ") by the mark of black diamonds, it may also be useful to the load waveform exported by cutting load testing portion 101 draws (being designated as in figure " before correction ") to the value of the rate constant a carrying out parameter identification and derive by the mark of white corner. As the set(ting)value DP of the lower dead center of pressure head 11, setting about 0.05 (mm) and about 0.8 (mm) these 2 kinds.

As shown in figure 12, with the use of correcting load waveform A2, B2 of correction in load waveform correction portion 102, even if when the setting of the lower dead center of the pressure head 11 of terminal press-connection device 200 is different, transform (1), constant a, b, the c of (2) that the calculating of crimp height uses can use common constant.

Next, with reference to Figure 13, the crimp height measuring method involved by present embodiment is described. Figure 13 is the schema illustrating the crimp height mensuration process implemented by the crimp height determinator of present embodiment. The process of the schema of Figure 13 is implemented when performing 1 crimping action of terminal press-connection device 200 every time by crimp height determinator 100.

In step S01, terminal press-connection device 200 is utilized to make crimping terminal 51. The process of step S01 advances to step S02 after completing.

In step S02, according to the crimping terminal 51 made in step S01, piezoelectric element 110 and cutting load testing portion 101 is utilized to obtain for the load waveform (load waveform obtaining step) in the crimping action making this crimping terminal 51. Cutting load testing portion 101, after amplifying, with amplification circuit, the quantity of electric charge produced by piezoelectric element 110, implements A/D conversion, is converted to digital voltage signal and exports. The process of step S02 advances to step S03 after completing.

In step S03, load waveform correction portion 102 is utilized to carry out in aligning step S02 the load waveform (load waveform correction step) obtained. Load waveform correction portion 102 uses described (10) formula, corrects the load waveform inputted from cutting load testing portion 101, exports correcting load waveform. The process of step S03 advances to step S04 after completing.

In step S04, utilize peak load calculating section 103, calculate peak load P (peak load calculates step) according to the waveform of correcting load of correction in step S03. Maximum value in each key element of correcting load waveform is such as exported as peak load P by peak load calculating section 103.The process of step S04 advances to step S05 after completing.

In step S05, utilize crimp height calculating section 104, it may also be useful to the peak load P calculated in step S04, calculate crimp height CH (crimp height calculates step). The set(ting)value DP of the lower dead center of the pressure head 11 of the terminal press-connection device 200 of the crimping action of the peak load P inputted from peak load calculating section 103, step S01 is inputed to described transform (1), (2) by crimp height calculating section 104, calculates crimp height CH. The process of step S05 advances to step S06 after completing.

In step S06, utilize crimped status detection unit 105, it may also be useful to the crimp height CH calculated in step S05, the crimped status of the crimping terminal 51 made in determination step S01. With predetermined crimp height high limit of tolerance value and crimp height, the crimp height CH inputted from crimp height calculating section 104 is such as allowed that at least one in lower value compares by crimped status detection unit 105, thus judge crimped status. When crimp height CH is greater than high limit of tolerance value, terminal 51 is not fully compressed crimping relative to heart yearn 60, can produce poor flow in some situations between crimping terminal 51 and electric wire 61. On the other hand, when crimp height CH be less than allow lower value, in some situations due to compress crimping terminal 51 can cut off heart yearn 60 and electric wire 61 produce broken string bad. Crimped status detection unit 105 when crimp height CH is below crimp height high limit of tolerance value, can be judged to that the crimped status crimping terminal 51 is good; When crimp height CH exceedes crimp height high limit of tolerance value, it is judged to that the crimped status crimping terminal 51 is bad. In addition, crimped status detection unit 105 can when crimp height CH be crimp height allow more than lower value, be judged to crimp terminal 51 crimped status good; When crimp height CH be less than crimp height allow lower value, be judged to crimp terminal 51 crimped status bad. The crimped status result of determination of crimping terminal 51 is exported to display unit etc. and shows user by crimped status detection unit 105. After the process of step S06 completes, terminate a series of process of the schema of Figure 13.

As mentioned above, crimp height determinator 100 involved according to the present embodiment and the crimp height measuring method implemented by this crimp height determinator 100, for the load waveform detected out by cutting load testing portion 101, load waveform correction portion 102 consider the amplification circuit in cutting load testing portion 101 discharge time constant to correct this load waveform, and export correcting load waveform. This correcting load waveform due to reduce the amplification circuit in cutting load testing portion 101 electric discharge impact, so with the use of this correcting load waveform, the impact that can not be subject to the various settings (size etc. of the lowering speed of pressure head 11, the set(ting)value of lower dead center, electric wire 61) of the crimping action of terminal press-connection device 200, calculates later peak load P, crimp height CH accurately. Consequently, it is possible to improve the measurement accuracy of the crimp height CH based on peak load P.

Above, describe embodiments of the present invention, but above-mentioned enforcement mode only presents as an example, it does not have the scope of intended limitation invention. Above-mentioned enforcement mode can be implemented with other various forms, in the scope not departing from invention main points, it is possible to carry out various omission, replacement, change.It is same that above-mentioned enforcement mode and distortion thereof comprise with the scope invented, main points, is included in the invention described in claim book and in equivalency range.

Claims (10)

1. a crimp height determinator, it is characterised in that, comprising:

Piezoelectric element, it is arranged between crimping machine and anvil to carry out and terminal and electric wire crimp is crimped the terminal press-connection device that action makes crimping terminal, and the change of the load being attached to described terminal according to described crimping machine and described anvil in described crimping action produces electric charge;

Cutting load testing portion, it is voltage by the described charge conversion that described piezoelectric element produces, and the time lapse of the described voltage of conversion exports the time lapse as the described load in described crimping action and load waveform;

Load waveform correction portion, the described load waveform that its correction exports from described cutting load testing portion also exports correcting load waveform;

Peak load calculating section, it, according to by correcting load waveform described in the correction of described load waveform correction portion, calculates maximum value and the peak load of the described load being attached to described terminal in described crimping action; And

Crimp height calculating section, it is based on the described peak load calculated by described peak load calculating section, calculates the crimp height of the described crimping terminal made by described terminal press-connection device,

Described cutting load testing portion comprises amplification circuit, described amplification circuit has electric capacity and resistance, the described charge charging produced by described piezoelectric element is to described electric capacity, described voltage is exported according to the electric charge being charged to described electric capacity, and utilize described resistance to make the described charge discharge being charged to described electric capacity

Constant discharge time of the described amplification circuit that described load waveform correction portion determines based on the electrical capacity of the described electric capacity by described cutting load testing portion and the resistance value of described resistance, corrects described load waveform.

2. crimp height determinator as claimed in claim 1,

The n-th key element at the described waveform of correcting load represents for ADi (n), n-th key element of described load waveform represents for ADo (n), the electrical capacity of described electric capacity represents for C, the resistance meter of described resistance is illustrated as R, sampling period is when representing for �� t, and described load waveform correction portion uses following severals formulas to correct described load waveform and correcting load waveform described in output:

[formula]

3. crimp height determinator as claimed in claim 1 or 2, represents for CH at described crimp height, and described peak load represents for P, and when constant table is illustrated as a, b, described crimp height calculating section uses following several formulas to calculate described crimp height:

CH=a �� P+b.

4. crimp height determinator as claimed in claim 3,

The described compression joint mechanism of described terminal press-connection device becomes and pressure head link, and carries out lifting relative to described anvil together with this pressure head, in lower dead center, the described terminal on described anvil is pressed on the heart yearn of described electric wire, thus makes described crimping terminal,

The described crimping machine dropping to described lower dead center when described terminal and described electric wire do not exist and described anvil are b in the time interval crimping machine lifting direction, the bottom dead center position of described pressure head represents for DP, when constant table is illustrated as c, described crimp height calculating section uses following several formulas to calculate described crimp height:

CH=a �� P+b

B=DP+c.

5. crimp height determinator as described in arbitrary item of Claims 1 to 4,

Comprise crimped status detection unit, allow that at least one in lower value compares by the described crimp height calculated by described crimp height calculating section with predetermined crimp height high limit of tolerance value and crimp height, thus judge the quality of the crimped status of the described crimping terminal made by described terminal press-connection device.

6. a crimp height measuring method, it is characterised in that, comprising:

Load waveform obtaining step, terminal and electric wire crimp crimped in the piezoelectric element that the change that action makes the terminal press-connection device of crimping terminal and be attached to the load of described terminal in described crimping action according to described crimping machine and described anvil produces electric charge being arranged between crimping machine and anvil to carry out, it is voltage by the described charge conversion produced, the time lapse of the described voltage of conversion is obtained the time lapse as the described load in described crimping action and load waveform;

Load waveform correction step, corrects in described load waveform obtaining step the described load waveform obtained and exports correcting load waveform;

Peak load calculates step, according to correcting load waveform described in correction in described load waveform correction step, calculates maximum value and the peak load of the described load being attached to described terminal in described crimping action;

Crimp height calculates step, calculates the described peak load calculated in step based on described peak load, calculates the crimp height of the described crimping terminal made by described terminal press-connection device,

Described load waveform obtaining step uses amplification circuit to obtain described load waveform, described amplification circuit has electric capacity and resistance, the described charge charging produced by described piezoelectric element is to described electric capacity, described voltage is exported according to the electric charge being charged to described electric capacity, and utilize described resistance to make the described charge discharge being charged to described electric capacity

Described load waveform correction step, based on constant discharge time of the described amplification circuit determined by described electric capacity and described resistance, corrects described load waveform.

7. crimp height measuring method as claimed in claim 6,

The n-th key element at the described waveform of correcting load represents for ADi (n), n-th key element of described load waveform represents for ADo (n), the electrical capacity of described electric capacity represents for C, the resistance meter of described resistance is illustrated as R, sampling period is when representing for �� t, and described load waveform correction step uses following severals formulas to correct described load waveform and correcting load waveform described in output:

[formula 2]

8. crimp height measuring method as claimed in claims 6 or 7, represents for CH at described crimp height, and described peak load represents for P, and when constant table is illustrated as a, b, described crimp height calculates step and uses following several formulas to calculate described crimp height:

CH=a �� P+b.

9. crimp height measuring method as claimed in claim 8,

The described compression joint mechanism of described terminal press-connection device becomes and pressure head link, and carries out lifting relative to described anvil together with this pressure head, in lower dead center, the described terminal on described anvil is pressed on the heart yearn of described electric wire, thus makes described crimping terminal,

The described crimping machine dropping to described lower dead center when described terminal and described electric wire do not exist and described anvil are b in the time interval crimping machine lifting direction, the bottom dead center position of described pressure head represents for DP, when constant table is illustrated as c, described crimp height calculates step and uses following several formulas to calculate described crimp height:

CH=a �� P+b

B=DP+c.

10. crimp height measuring method as described in arbitrary item of claim 6��9,

Comprise crimped status determination step, allow that at least one in lower value compares by calculating, by described crimp height, the described crimp height that step calculates with predetermined crimp height high limit of tolerance value and crimp height, thus judge the quality of the crimped status of the described crimping terminal made by described terminal press-connection device.