JPH09277122A - Manufacture of press fit connecting member and its manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a member pressed fit with a press fit material into a press fitted material with high speed and high accuracy and provide its manufacturing device. SOLUTION: This press fit device 10 is provided with a press fit device 20 pressing a press fit material 81 into a press fitted material 82, a correction quantity setting means recording the displacement quantity S1(F) of the press fit material 81 and the press fitted material 82 against the press fit load F and the displacement quantity S2(F) of the contact section of the pressure device 20, a load detecting means 15 detecting the press fit load F or its reaction force -F, a shift quantity detecting means 16 detecting the shift quantity D of the press fit material 81, and a control means operating the pressure device 20. The control means operates the pressure device 20 so that the shift quantity D of the press fit material 81 becomes the quantity (Ls+S1(F)+S2(F)) added with the correction quantities S1(F), S2(F) to the target press fit length Ls.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a manufacturing method and a manufacturing apparatus capable of manufacturing a press-fitting connecting member formed by press-fitting a press-fitted material into a press-fitted material at high speed and with high accuracy.

[0002]

2. Description of the Related Art A press-fitting connecting member formed by press-fitting a protrusion of another member into an empty portion of one member is often used. In order to manufacture such a press-fitting connecting member, as shown in FIG. 7, the press-fit material 82 is held in the work holding part 91 of the press-fitting device 90 and the press-fit material 81 is set in the press-fitting part 821 of the press-fit material 82. And press fit. That is, the press-fitting material 81 is pressed into the press-fitting punch 92.
And presses the press-fitting punch 92 in the press-fitting direction by the pressurizing means 93, the position sensor 94 detects the press-fitting amount of the press-fitting material 81, and the pressurizing means 9 is adjusted so that the press-fitting amount L becomes a predetermined value L _S.
3 is controlled.

The pressurizing means 93 transmits the rotation of the servo motor 931 to the ball screw 934 via the coupling gears 932 and 933, and moves the press-fitting punch 92 by an amount proportional to the rotation speed of the ball screw 934. The rotation amount N of the servo motor 931 or the movement amount of the press-fitting punch 92 is controlled based on a command from the controller 95. That is, the controller 95 determines the target rotation amount N based on the detection value of the position sensor 94, and the rotation speed w
The servo motor 931 is controlled according to an appropriate transition curve of (t) with respect to time t.

In the figure, reference numeral 961 is a table serving as a reference position (plane) of the apparatus, and reference numeral 962 is a frame for holding the pressurizing apparatus 93. When the press-fitting amount (press-fitting position) of the press-fitting material 81 is manufactured with high accuracy, for example, with a tolerance of about ± 0.005 μm, the press-fitting amount and the press-fitting speed are gradually reduced as shown in FIG. The target position is approached through several steps (4 steps in the figure). The reason is that if the target press-fitting position is reached in one or two press-fitting steps, the press-fitting becomes excessive (excessive press-fitting) and the yield is significantly reduced.

That is, in the first press-fitting, the press-fitting punch 92 is firmly brought into contact with the press-fitting material 81, the second press-fitting is performed by rough press-fitting close to the target value, the press-fitting amount is measured, and the third press-fitting is performed. Measure the amount of press-fitting by further approaching the vicinity of 1-2% of the value,
The press-fitting material 81 is press-fitted within the target tolerance by the last one or two press-fitting steps. And each press-fitting process requires substantially the same process time (about 2 seconds in the above example).
The number of press-fitting steps tends to increase as the required accuracy increases, and the press-fitting speed in the subsequent steps slows down and the manufacturing time tends to increase.

[0006]

However, the above-mentioned conventional press-fitting method has a problem in that the number and time of the press-fitting steps are long and the production efficiency is low. Further, when the required accuracy is further increased, there is a problem that the desired accuracy cannot be obtained even if the number of press-fitting steps is increased and the yield (non-defective product rate) is reduced, which is a method limitation. The present invention has been made in view of such conventional problems, and provides a manufacturing method and a manufacturing apparatus capable of manufacturing a press-fitting connecting member formed by press-fitting a press-fitted material into a press-fitted material at high speed and with high accuracy. Is what you are trying to do.

[0007]

According to the inventions of claims 1 and 4, the measured value or calculated value S1 (F) of the deformation amount or strain amount of the press-fit material and the press-fit material with respect to the press-fit load F and the press-fitting device The measured value or calculated value S2 (F) of the displacement amount with respect to the press-fitting load F at the contact portion is set in advance, the press-fitting load F is measured during press-fitting, and the correction amount S1 (F) is added to the target press-fitting length L. , S2 (F) plus (L + S1
The press-fit length is controlled by (F) + S2 (F)). As a result, as will be described below, it is possible to press-fit the press-fitting material with high accuracy with a small number of steps (time).

That is, the deformation of the press-fitted material and the press-fitted material caused by the press-fitting load and the deformation of the press-fitting device caused by the press-fitting load cannot be ignored when the error tolerance with respect to the press-fitting value becomes small. Will not be obtained. In addition, the process time becomes long and the yield also decreases. For example, when the apparatus shown in FIG. 7 is taken as an example, both members 81 and 82 are elastically deformed by the press-fitting load F applied to the press-fitting material 81 and the press-fitted material 82 from the press-fitting punch 92,
The position sensor 94 measures a value including the added value S1 (F) (error element) of the press-fitting direction component of the displacement.

Similarly, when the press-fitting load F is applied to the press-fitting material 81, the press-fitting device 90 is deformed by the press-fitting load and its reaction force -F. For example, the ball screw 933 and the press-fitting punch 92 are elastically deformed by receiving the thrust in the press-fitting direction by the motor 931 and the force in the opposite direction by the reaction force −F, and similarly, the frame 962 is also slightly elastically deformed. The added value of these deformations appears as a positional deviation S2 (F) in the press-fitting direction at the contact point with the press-fitting material 81, and the position sensor 94 measures what includes the error element S2 (F). Becomes

Therefore, the error elements S1 (F), S2
If the press-fitting operation amount is controlled as the target value L _S itself without considering (F), the above-mentioned S1 (F) and S2 (F) become manufacturing errors due to elastic restoration after the process is completed. However, in the inventions of claims 1 and 4, the error element S1 is
Target value (L _S + S1) considering (F) and S2 (F)
(F) + S2 (F)), the deformation error S
1 (F) and S2 (F) are elastically restored after the press-fitting is completed, and the target press-fitting amount L _S is obtained as a result.

The correction values S1 (F) and S2 (F) can be determined by actual measurement or calculation such as computer simulation. In the normal elastic deformation region, the press-fit load F with respect to the press-fit load F is set in the normal elastic deformation region. It can be set as a linear function. That is, as shown in FIG. 6, the displacements S1 and S2 with respect to the press-fit load F can be represented by straight lines as indicated by reference numerals 45 and 46 in the elastic deformation region (that is, if a _{1 to} a ₄ are constants). , S1 = a ₁ F + a ₂ ,
_{S2 = a 3 F + a 4} ). Further, in order to reduce the number of manufacturing steps, as described in claim 2 or claim 5, the entire process does not consider the correction amounts S1 (F) and S2 (F), and press-fits the material to the vicinity of the target press-fit length L. Rough press-fitting process (control)
And press-fit load F is measured and correction amounts S1 (F), S2 (F)
It is preferable to configure by the two-stage control of the main press-fitting step (control) in which the press-fitting is performed in consideration of the above. In a state of being far away from the target value (more than the correction amounts S1 (F) and S2 (F)),
This is because even if the altitude control is performed in consideration of the correction amounts S1 (F) and S2 (F), it is useless and the man-hour is increased.

Further, as described in claim 3 or claim 6, in the main press-fitting step, it is preferable to control the pressurizing device so that the press-fitting load F becomes substantially the same. If the press-fit load F is substantially the same, the correction values S1 (F), S2 (F)
Is also substantially the same, and the control calculation becomes easy. As a method of making the press-fitting load F substantially the same, there is a method of making the moving (press-fitting) speed of the press-fitting material substantially constant.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment Example In this embodiment, as shown in FIGS. 1 and 2, a press-fitting connecting member 8 is formed by press-fitting a press-fitting material 81 into a press-fitted material 82 by a predetermined length L.
It is the press-fitting device 10 of 0. The press-fitting device 10 is a press-fitted material 8
Work holding part 11 for clamping and holding 2, and press-fitting material 8
1. The press-fitting device 20 that presses 1 toward the press-fitted material 82, and the measured value or calculated value S1 of the amount of deformation or strain in the press-fitting direction of the press-fitted material 81 and the press-fitted material 82 with respect to the press-fitting load F.
Correction amount setting means (input) for inputting and recording (F) and the measured value or calculated value S2 (F) of the displacement amount in the press-fitting direction with respect to the press-fitting load F at the contact portion between the press-fitting material 81 of the pressurizing device 20. Correction data file 130) provided on the means 12 and the magnetic disk 13, and the press-fitted material 82 of the press-fitted material 81
Load detecting means (load cell) 15 for detecting the press-fitted load F or its reaction force −F, and a moving amount detecting means (position sensor) for detecting the moving amount (press-fitting amount D) of the press-fitting material 81 in the press-fitting direction with respect to the reference position. ) 16 and a controller 30 for receiving the output signals of the load cell 15 and the position sensor 16 and the record information of the correction data file 130 of the correction amount setting means and operating the pressurizing device 20.

The controller 30 then press-fits the material 81.
Of the target press-fit length L _S0 plus the correction amounts S1 (F) and S2 (F) corresponding to the press-fit load F (L _S0 + S
The pressurizing device 20 is operated so as to be 1 (F) + S2 (F)). In addition, the controller 30 is, as shown in FIG.
Rough press-fitting control 41 that press-fits the press-fitting material into the vicinity of the target press-fitting length L without considering the correction amounts S1 (F) and S2 (F), and the correction amounts S1 (F) and S2 (F ) Is added to the main press-fitting control 42 for performing press-fitting. Then, in the main press-fitting control 42, the controller 30 controls the press-fitting while operating the pressurizing device 20 so that the press-fitting load F becomes substantially the same.

The following is a supplementary explanation for each.
As shown in FIG. 1, the work holding member 11 and the pressurizing device 20.
Are installed on a stable table 19 which serves as a position reference. The pressurizing device 20 is erected on the table 19 via a frame 21, and has a servomotor 23 having a press-fitting punch 22 that abuts the press-fitting material 81 and a control device 231 (FIG. 2), and couplings 241 and 242. And a ball screw 25 that is connected to the servomotor 23 via the. Further, a displacement sensor 232 is arranged between the upper end of the ball screw 25 and the surface (reference surface) of the table 19, and the movement amount of the ball screw 25 is fed back to the control device 231 to make the ball screw 2
The movement amount of 5 can be controlled accurately.

As shown in FIG. 2, the output of the load cell 15 is amplified by the operational amplifier 151, converted into a digital signal by the A / D converter 152, and input to the controller 30. The position sensor 16 contacts the bottom surface of the press-fitting material 81 and transmits a number of pulses proportional to the distance from the reference position. The transmitted pulses are counted (integrated) by the pulse counter 161 and the encoder 1
It is coded at 62 and input to the controller 30.

The controller 30 comprises a microcomputer as a hardware resource and an application program. The press-fitted material 81 and the press-fitted material 82
To the correction amount S1 (F), and the device correction amount S2
(F), manufacturing data and the like of the press-fitting connecting member (press-fitting material, press-fitted material) are input from the input means 12 such as a keyboard, and the data relating to the device 10 and the data relating to the press-fitting connecting member are not shown in the display device 35 or not shown. It can be output to a printing device. In the figure, reference numeral 31 is a central processor, reference numeral 32 is an input / output device, which are closely coupled via an internal bus 300.

Next, the control procedure of the press-fitting device 10 of this embodiment will be described with reference to the flow chart shown in FIG. First, in step 601, the controller 30
From the file of the magnetic disk 13, the manufacturing data of the press-fitting connecting member (the press-fitting material 81, the press-fitted material 82) (the allowable range of the press-fitting value L _{S1 to} L _S2, etc.), the correction data (the press-fitting load F and the displacement S1).
(F), S2 (F) relational expression or table) is read.

Next, in step 602, as shown in FIG. 4, the operation press-fitting amount is set to a value of about 90% of the target value L _S0 (= center value of L _{S1 to} L _S2 ) and the servo motor 23
Command to the control device 231. At this time, as shown in FIG. 5, the rotation speed w of the motor at the final stage of the rough press-fitting 41
_o (rpm) is controlled to a low constant value. As a result, the press-fitting load F of the press-fitting material 81 can be made almost constant.

Next, at step 603, the press-fitting load F and the press-fitting amount D of the press-fitting material 81 after the rough press-fitting are measured by the load cell 15 and the position sensor 16. Then, in step 604, the correction amounts S1 (F) and S2 (F) are subtracted from the press-fitting amount D in the loaded state to calculate the net press-fitting amount L, and whether the value L exceeds the allowable limit L _S2 . Check if it is over-pressurized. If the result of step 604 is yes,
The process proceeds to step 611 to display that the manufacturing is defective.

On the other hand, if the result of step 604 is negative,
Proceeding to step 605, the shortage of the press-fitting amount (L _S0 -L) is set to the next press-fitting operation amount. Then, in step 606, as shown in FIG. 5, the press-fitting is performed while maintaining the rotational speed of the motor at the above-mentioned rotational speed w ₀ so that the press-fitting load becomes almost the same. Then, in step 607, the press-fitting load F and the press-fitting amount D of the press-fitting material 81 are measured by the load cell 15 and the position sensor 16.

Then, in step 608, the correction amounts S1 (F) and S2 are calculated from the press-fitted amount D in the loaded state.
(F) is subtracted to calculate the net press fit amount L, and it is checked whether the value L is within the allowable range L _{S1 to} L _S2 .
Then, if the result is YES, the process proceeds to step 609 to display that the non-defective product is manufactured, and the process ends. On the other hand, step 6
If the result of 08 is negative, the routine proceeds to step 621, where it is checked whether the net press-fitting value L exceeds the press-fitting allowable limit L _S2 , that is, whether it is in the over-pressurizing state. And
If the result is yes, the process proceeds to step 622 to display that the manufacturing is defective.

On the other hand, if the result of step 621 is negative,
Proceeding to step 631, the shortage amount (L _S0 −L) of the press-fitting amount is set to the next press-fitting operation amount. Then, in step 632, the motor is repressurized while maintaining the rotation speed w ₀ so that the press-fitting load is almost the same, and the process returns to step 607 again. And step 60
Repeat the same procedure from 7.

As described above, if press-fitting is performed using the press-fitting device 10 of this example, the manipulated variable of press-fitting is the error factor S1 (F),
Target value (L + S1 (F) + S2 considering S2 (F)
Since it is set to (F), the press-fitting amount excluding the deformation errors S1 (F) and S2 (F) caused by applying the press-fitting load is obtained as a result. That is, the member elastically restores by the above S1 (F) and S2 (F) after the press-fitting process, and a manufacturing error due to elastic deformation during the press-fitting process does not occur. Therefore, it is possible to manufacture the press-fitting connecting member with extremely high accuracy.

Further, since the control is performed in consideration of the correction values S1 (F) and S2 (F), it is possible to reach the target accuracy by performing the main press-fitting process once in most cases, and the manufacturing time is shortened. . That is, in the conventional method, when manufacturing with a tolerance of about ± 0.005 μm, four press-fitting steps were required as shown in FIG. 8, but in this example, as shown in FIG. However, most of the manufacturing can be completed in two press-fitting steps, which greatly improves the production efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a press-fitting device according to an embodiment.

FIG. 2 is a system connection diagram of the press-fitting device according to the embodiment.

FIG. 3 is a flowchart showing a control procedure of the press-fitting device according to the embodiment.

FIG. 4 is a view showing a lapse of time of the press-fitting amount in the press-fitting process of the embodiment.

FIG. 5 is a diagram showing changes in the rotation speed of the servo motor in the press-fitting process of the embodiment.

FIG. 6 is a diagram showing an example of a relationship between a press-fit load F and correction amounts S1 (F) and S2 (F).

FIG. 7 is a sectional view of a main part of a conventional press-fitting device.

FIG. 8 is a view showing a lapse of time of a press-fitting amount in a conventional press-fitting process.

[Explanation of symbols]

10. . . Press-fitting device, 15. . . Load detection means (load cell), 16. . . 20. Position detecting means (position sensor), . . Pressure device, 81. . . Press-fitting material, 82. . . Press-fitted material, F. . . Press-fit load, L _S. . . Press-fit target value, S1 (F). . . Deformation correction amount of press-fit material and press-fit material due to press-fit load, S2 (F). . . Amount of correction of device deformation due to press-fit load,

Claims (7)

[Claims] 1. A method of manufacturing a press-fitting connecting member, which comprises press-fitting a press-fit material into a press-fit material for a predetermined length L _S , the deformation amount of the press-fit material and the press-fit material in a press-fitting direction with respect to a press-fit load F. Alternatively, the measured value or calculated value S2 (F) of the displacement amount in the press-fitting direction with respect to the press-fitting load F at the contact portion between the measured value or calculated value S1 (F) of the strain amount and the press-fitted material of the press-fitting device that presses the press-fitted material. F) is set in advance, the press-fitting load F is measured during press-fitting, and the target press-fitting length L _S is added with the correction amounts S1 (F) and S2 (F) corresponding to the press-fitting load F to obtain a length ( A method for manufacturing a press-fitting connecting member, wherein the press-fitting length is controlled by L _S + S1 (F) + S2 (F)). 2. The press-fitting step according to claim 1, wherein the press-fitting step is a rough press-fitting step of press-fitting the press-fitting material to a vicinity of the target press-fitting length L without considering the correction amounts S1 (F) and S2 (F), and a press-fitting load F. And a correction amount S1 (F) and S2 (F) are added to perform the press-fitting process, and the press-fitting connecting member is manufactured. 3. The method of manufacturing a press-fitting connecting member according to claim 2, wherein in the main press-fitting step, press-fitting is performed while controlling the press-fitting loads F to be substantially the same. 4. An apparatus for manufacturing a press-fitting connecting member, wherein a press-fitting material is press-fitted into a press-fitting material by a predetermined length L _S, and a work holding means for holding the press-fitting material and the press-fitting material. Of the press-fitting member for pressing the press-fitting member F against the press-fitting member F and the measured value or calculated value S1 (F) of the deformation amount or strain amount of the press-fitting member and the press-fitted member in the press-fitting direction and the press-fitting member of the press-fitting member. Correction amount setting means for inputting and recording the measured value or calculated value S2 (F) of the displacement amount in the press-fitting direction with respect to the press-fitting load F at the section, and the press-fitting load F of the press-fitted material to the press-fitted material or its reaction force −F Load detecting means for detecting the load, a moving amount detecting means for detecting a moving amount of the press-fitting material in the press-fitting direction with respect to a reference position, output signals of the load detecting means and the moving amount detecting means, and record information of the correction amount setting means. To control the press-fitting means Has a stage, the control means, the amount of movement of the press-fitting member is, the correction amount S1 corresponding to press-fit load F to the target press fitting length L _S (F), was added S2 (F) ( An apparatus for manufacturing a press-fitting connecting member, characterized in that the press-fitting means is operated so that L + S1 (F) + S2 (F)). 5. The rough press-fitting control according to claim 4, wherein the control means press-fits the press-fitting material to the vicinity of the target press-fitting length L without considering the correction amounts S1 (F) and S2 (F), and the press-fitting load F. And a correction amount S1 (F) and S2 (F) are added to perform a press-fitting control in which the press-fitting control is performed in two steps before and after the main press-fitting control. 6. The press-fitting connecting member according to claim 5, wherein the control means performs press-fitting control while operating the press-fitting means such that the press-fitting loads F are substantially the same in the subsequent main press-fitting control. Manufacturing equipment. 7. The press-fitting coupling member according to claim 1, wherein the correction amounts S1 (F) and S2 (F) are set as a linear function with respect to the press-fitting load F. Manufacturing method or manufacturing apparatus.