JP4725493B2 - Product manufacturing method, switch manufacturing method, and step bending apparatus - Google Patents

Description

  The present invention relates to a method for manufacturing a product in which a pair of components are assembled to a case, a method for manufacturing a switch, and a step bending apparatus used therefor.

  A switch, for example, a micro switch, has a minute contact interval and a snap action mechanism, and switches contacts (for example, see Patent Document 1).

As shown in FIG. 23, the microswitch includes a movable piece 9 having a movable contact 13 at a free end, an open (normally open) side and a closed (normally closed) side facing the free end of the movable piece 9. Side fixed contacts 17 and 15, respectively, and by pressing an actuator (not shown), the movable contact 13 is changed from the closed side fixed contact 15 to the open side fixed contact 17 side. It will be switched to. FIG. 23 shows an operating state in which the actuator is pressed.
JP 2003-317573 A

  In the microswitch having the above-described configuration, various types of microswitches having a contact distance D are required according to various requirements of a user who wants to detect a relatively large displacement or a user who wants to detect a minute displacement.

  The micro switch with the above configuration is incorporated in pressure gauges, thermometers, and hygrometers to detect water pressure, hydraulic pressure, and air pressure, but there are multiple differences in pressure depending on the measurement target, increasing the user's required specifications. There are challenges. For example, when incorporated in a pressure gauge, a difference in movement or force corresponding to a pressure change is required, and the movement is made to correspond to the contact distance D of the switch. The required pressure change is detected corresponding to the difference between the two. Therefore, a DF characteristic corresponding to the pressure detection width is required.

  Conventionally, for each model with different contact distances corresponding to the DF characteristics, various types of fixed pieces that are bent in advance according to the contact distances are prepared in a dedicated mold, and equipment corresponding to each model is prepared. Many types of microswitches were produced using the and line.

  In this way, for each model, the corresponding fixed piece is used for production using equipment and lines, so in multi-volume production, the stock of fixed pieces for each model increases, and the number of equipment and lines increases. There is a drawback that it takes time and effort to change.

  The present invention has been made paying attention to such a situation, and improves the productivity of products in which the distance between a pair of parts, such as a movable piece and a fixed piece, is different for each product type, thereby reducing the cost. The purpose is to plan.

(1) A method for manufacturing a product according to the present invention is a method for manufacturing a product in which at least a pair of components are assembled to a case, and the facing interval between the pair of components is a required interval. One part material of a pair of parts is subjected to a step bending process at a predetermined step so that the step surfaces of the one end side and the other end side are parallel based on the positional relationship with the other part. the resulting parts, the resulting one component state, and are not assembled on the other part facing the allowed by the case, the one component material consists flat sheet material, the step bending is The first sandwiching member that sandwiches both surfaces of one end of the flat thin plate material closely without any gap, and the both surfaces of the other end of the flat thin plate member are weaker than the sandwiching force of the first sandwiching member. 2nd pinch which pinches closely without gap with pinching force A step bending device that can be relatively moved in parallel with the step bending direction while maintaining the state in which the both sandwiching members are tightly sandwiched without gaps from the start to the end of the step bending process. It is characterized by being used.

  The required interval is preferably an interval corresponding to each product type.

  The positional relationship with the other component is preferably a positional relationship when it is assumed that one component material is assembled with respect to the other component assembled with the case.

  According to the present invention, one part material is subjected to a step bending process based on the positional relationship with the other part so that the facing distance between the pair of parts is a required distance, so that one part is obtained. By adjusting the processing amount of the step bending process, it is possible to easily cope with a wide variety of products, and it is possible to cope with only one kind of the one part material. Accordingly, it is not necessary to prepare a stock of parts for each product type or to provide each production line, thereby increasing the productivity of products produced in a small amount of various products and reducing costs.

According to the present invention , using a step bending device, one end of a flat sheet material is firmly clamped by one clamping member and the other end side of the flat sheet material is weakened by the other clamping member. When the two clamp members are moved relative to each other in accordance with the step bending height, step bending can be performed while maintaining the step surface parallel to one end and the other end. Can be done easily and quickly without taking time.

(3) The manufacturing method of the switch of the present invention is a method of manufacturing a switch in which a fixed piece having a fixed contact and a movable piece having a movable contact contacting and separating from the fixed contact are incorporated in a case, One kind of fixed piece material is used so that the step surface between the one end side and the other end side is parallel so that the contact distance between the fixed contact and the movable contact is the required contact distance corresponding to each model individually. and a step bending to the fixing piece in a predetermined step so that the state, and are not assembled to the fixing piece to the case, the step bending, said one flat securing piece is a fixed piece material A first clamping member that clamps both surfaces of one end side of the flat fixed piece without gaps, and a gap between the both surfaces of the other end of the flat fixed piece with a clamping force that is weaker than the clamping force of the first clamping member A second clamping member that is tightly clamped and And using a step bending device capable of relatively moving in parallel with the step bending direction while maintaining the state where the both sandwiching members are sandwiched closely without gaps from the start to the end of the step bending process. It is characterized by.

  According to the manufacturing method of the switch of the present invention, one kind of fixed piece material is subjected to a step bending process. By adjusting the processing amount of the step bending process, the fixed contact of the fixed piece and the movable member when assembled to the case are adjusted. It is possible to adjust the contact interval with the movable contact of one piece, and it is possible to easily cope with the manufacture of various types of switches having different contact intervals with one type of fixed piece material.

  As a result, it is not necessary to prepare a stock of fixed pieces that have been bent in advance for each model or to provide each production line, thereby improving the productivity of switches that are produced in small quantities of various types and reducing costs. Can be planned.

  In addition, the step is bent so that the step surface on one end side and the other end side of the fixed piece is parallel, so the fixed contact on one end side and the mounting surface for the case on the other end side are parallel, and the contact is opened and closed In this case, the contact is consumed, but the contact state of the contact becomes better than that of the non-parallel fixed piece, and the switch quality can be maintained for a long time.

  When bending one end side of a flat fixed piece and bending the other end side spaced apart from this one end side in the opposite direction to make a step bend, it is difficult to keep the one end side and the other end side parallel to the step surface. It is.

According to the present invention , by using the step bending device, one end of the flat fixed piece is firmly clamped by one clamping member and the other end of the flat fixed piece is weakened by the other clamping member. When the two clamp members are moved relative to each other in accordance with the step bending height, step bending can be performed while maintaining the step surface parallel to one end and the other end. Can be done easily and quickly without taking time.

  (5) In the embodiment of the above (4), a first step of preparing the flat fixing piece having the fixed contact on the one end side or the other end side in advance, and the flat fixing piece in the case A second step of obtaining a contact distance between the movable contact and the fixed contact of the flat fixed piece when it is assumed that it is assembled; and the step required to make the obtained contact distance the required contact distance. The method includes a third step of calculating a bending amount and a fourth step of bending the flat fixed piece according to the step according to the calculated amount.

  According to this embodiment, the contact distance when it is assumed that a flat fixed piece is assembled to the case is obtained, and based on this, the amount of step bending required to obtain the required contact distance is calculated. There is no need to assemble the fixed piece to the case before bending, and the fixed piece after the step bending process may be assembled to the case.

  (6) In the embodiment of the above (5), the second step includes a step of obtaining a first distance, a step of obtaining a second distance, and the contact interval from the first and second distances. The first distance is a distance between the movable contact of the movable piece corresponding to the operating state assembled to the case and a reference surface of the case to which the fixed piece is assembled, and the second distance The distance may be a distance between the fixed contact of the flat fixed piece and the assembly surface of the flat fixed piece with respect to the reference surface.

  According to this embodiment, since the distance to the reference plane is obtained with the movable piece assembled to the case, the processing amount of the step bending process to obtain the required contact distance including the variation in the dimensions of the parts in the case Can be calculated.

  (7) In the embodiment of the above (6), in the step of obtaining the first distance, the position of the movable contact of the movable piece corresponding to the operating state assembled to the case is measured by a sensor, while the fixed piece Measuring the position of the reference surface to which the sensor is assembled with a sensor, calculating the first distance from the measured both positions, and obtaining the distance of the two, the position of the fixed contact of the flat fixed piece is determined While the measurement is performed by the sensor, the position of the assembly surface of the fixed piece with respect to the reference surface may be measured by the sensor, and the second distance may be calculated from the measured positions.

  According to this embodiment, the position of the movable contact and the position of the fixed contact with respect to the reference plane of the case to which the fixed piece is assembled can be measured, and the contact interval can be calculated from both measured positions.

  (8) In the step bending apparatus of the present invention, a fixed piece having a fixed contact and a movable piece having a movable contact contacting and separating from the fixed contact are arranged on one end side or the other of the fixed piece of the switch incorporated in the case. A step bending apparatus manufactured by bending a step from a flat fixed piece having the fixed contact on the end side, wherein the first fixed pinch tightly holds the both sides of the flat fixed piece without gaps. A member and a second clamping member for clamping the both surfaces of the other end of the flat fixed piece closely with no clamping force with a clamping force weaker than the clamping force of the first clamping member, The sandwiching member can be relatively moved in parallel with the step bending direction while maintaining the state in which the sandwiching member is tightly sandwiched without any gap from the start to the end of the step bending process.

  In the above case, it is sufficient that both the clamping members can be moved relative to each other, and one clamping member is fixed and only the other clamping member can be moved, or both clamping members can be moved in opposite directions. Also good. Or the aspect which makes the moving speed differ is also included while moving both clamping members in the same direction.

  The close contact with no gap is, for example, a state in which the clamping force on both sides of the fixed piece by the both sandwiching surfaces of the sandwiching member is increased so as to be closely contacted without gaps, or the friction coefficient of both sandwiching surfaces of the sandwiching member is reduced, for example, a mirror surface Including the state of being close and slippery with no gap.

  According to the step bending apparatus of the present invention, one end of the fixed piece is firmly clamped and fixed with one clamping member, and the other side of the fixed piece is clamped with a weak force with the other clamping member. Since the step can be bent by moving the attachment member relative to the step bending height, the desired step bending operation can be easily and quickly performed without taking time.

  In this case, one end side of the fixed piece is firmly clamped and fixed with one clamping member, and the other end side of the fixed piece is clamped with a weak force with the other clamping member in a state in which it is in close contact with no gap. This is to prevent the fixed piece from slipping between both surfaces of one of the sandwiching members. Therefore, in this sense, as long as both sides of one clamping member do not slide on both sides of the fixed piece during step bending, the clamping force of one clamping member and the other clamping For example, a positioning hole is made in the fixed piece, and a positioning pin fixed on one of the holding members is inserted into the positioning piece, and the fixed piece is held. You may not slip.

  Furthermore, since the one end side and the other end side of the fixed piece are moved in close contact with each other between the clamping members in the process from the start of the step bend to the end of the step bend, the bending on both sides of the one end side of the fixed piece is performed. The bending shape at the starting point and the bending shape at the bending starting point on both sides of the other end of the fixed piece are symmetrically stepped while maintaining the same shape. Therefore, the fixed piece after completion of the step bending maintains the parallelism between the step surface on one end side and the step surface on the other end side.

  (9) In a preferred embodiment of the step bending apparatus of the present invention, the first sandwiching member may be relatively movable with respect to the second sandwiching member.

 (10) In another embodiment of the step bending apparatus of the present invention, the step bending device includes a control means capable of controlling the amount of step bending processing steplessly, and the control means is provided on the flat fixed piece and the case. By calculating the predetermined step required for the flat fixed piece corresponding to the required contact interval from the measured value of the movable piece incorporated and the flat fixed piece by controlling the actuator. And a control unit for bending the predetermined step in a stepless manner.

  The control means is preferably a personal computer or a sequencer, for example.

  The actuator is preferably a servo motor, for example.

  According to this embodiment, from the measured values of the flat fixed piece and the movable piece incorporated in the case, a predetermined step corresponding to the amount of step bending to obtain the contact interval is calculated, and stepless step bending Therefore, it is possible to cope with the manufacture of a switch having any contact interval and to facilitate automation.

  (11) In the embodiment of the above (10), the control means, from the database storing the data of the required contact interval individually corresponding to each model of the switch according to the model change of the switch Corresponding required contact interval data may be taken in, and the step bending amount may be changed so that the acquired required contact interval is obtained.

  According to this embodiment, when the model of the switch to be produced is changed, the required contact gap data corresponding to the changed model is fetched, and the step bending processing amount is changed so as to be the required contact gap. Therefore, it is possible to easily cope with model changes.

  According to the present invention, one part material of a pair of parts is processed into a step by bending a step, so that by adjusting the processing amount of the step bending, the pair of parts when assembled to the case The interval between parts can be adjusted, and it is possible to easily cope with the manufacture of various types of products having different intervals.

  In particular, a flat fixed piece, which is one kind of fixed piece material, is bent stepwise. By adjusting the amount of step bending, the fixed contact of the fixed piece and the movable piece when assembled to the case are adjusted. The contact distance between the movable contact and the movable contact can be adjusted, so that one type of flat fixed piece can easily cope with the manufacture of various types of switches having different contact distances. As a result, it is not necessary to prepare a stock of fixed pieces that have been bent in advance for each model or to provide each production line, thereby improving the productivity of switches that are produced in small quantities of various types and reducing costs. Can be planned.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of a microswitch, and FIG. 2 is an exploded perspective view of a main part thereof.

  The lower case 1 of the switch case is provided with a common fixed terminal 3, a normally closed fixed terminal 5 and a normally open fixed terminal 7. The common fixed terminal 3 supports the base end side of the movable piece 9, and the common fixed terminal 3 is connected to the base end side of the pair of compression spring portions 9 a for snap action of the movable piece 9. A pair of receivers 11 that are engaged and supported by the mating grooves 11a are provided.

  The normally closed fixed terminal 5 and the normally open fixed terminal 7 are provided with fixed pieces 12 and 19 respectively having fixed contacts 15 and 17 with which the movable contact 13 on the free end side of the movable piece 9 contacts and separates.

  The cover case 21 supports a push button 23 as an actuator that abuts on the base end side of the movable piece 9.

  In a normal state where no external force is applied to the push button 23, as shown in the drawing, the free end side of the movable piece 9 is biased and displaced upward by the elastic restoring force of the compression spring portion 9a, so that the movable contact 13 is the fixed contact of the fixed piece 12. (Normally closed contact) 15 is kept in contact.

  When the push button 23 is pushed in and the movable piece 9 is displaced downward to reach the operating position, the elastic restoring force of the compression spring portion 9a is instantaneously reversed so as to bias and displace the movable piece 9 and move the movable contact. 13 is brought into contact with a fixed contact (normally open contact) 17 of the fixed piece 19 to perform contact switching.

  In return, when the push button 23 is displaced upward and reaches the return position after the operation position, the elastic restoring force of the compression spring portion 9a is reversed so that the movable piece 9 is biased upward. Then, the movable contact 13 comes into contact with the fixed contact 15 of the fixed piece 12 and returns.

  In the switch manufacturing method of this embodiment, the following is performed in order to increase the productivity of various types of microswitches having different contact intervals.

  That is, as shown in FIG. 3A, the fixed piece 19 and the movable piece 9 on the open circuit (normally open contact) side are assembled to the lower case 1, and the movable contact 13 is pressed against the fixed contact 17 in the operating state. The dimension D1 of the reference surface 24 to which the stationary piece 12 on the side of the normally closed contact) is assembled and the contact surface dimension D2 on the upper side of the movable contact 13 are measured using the displacement sensor 25-1, and are used as the first distance. The difference D3 (= D2-D1) is calculated.

  Next, the dimension D4 of the assembly surface 24a with respect to the reference surface 24 and the contact surface dimension D5 of the stationary contact 15 of the straight and flat closed-side stationary piece 12 as the stationary piece material shown in FIG. , Measured by the displacement sensor 25-2, and the difference D6 (= D4-D5) is calculated as the second distance.

  Next, as shown in FIG. 3C, the step bending device described later is used to fix the flat fixing piece 12 so that the sum of the differences D3 and D6 falls within the standard of the contact distance corresponding to the model to be produced. After the step is bent by the step 26 and the dimension of the fixed piece 12 subjected to the step bending is confirmed, the fixed piece 12 is fixed to the reference surface 24 of the lower case 1 by being crimped.

  FIG. 4 is a diagram showing the flow of each process according to the above manufacturing method.

  First, a case is supplied (step S1), a movable piece or the like is incorporated in the case (step S2), and the position of the movable piece, that is, the dimension shown in FIG. In step S3), the measured value is given to the personal computer 22 described later.

  On the other hand, a flat fixed piece as a fixed piece material is supplied (step S4), and the position of the fixed piece, that is, the dimension shown in FIG. 3B is measured by the displacement sensor 25-2 (step S5). The measured value is given to the personal computer 22.

  The personal computer 22 is based on the measurement values from the displacement sensors 25-1 and 25-2, and has a specification corresponding to the model of the switch that is a product, for example, a flatness for making contact intervals corresponding to the specifications F, G, and H. A target step bending amount of the fixed piece is calculated (step S6), and the step bending device is controlled to bend the flat fixed piece according to the product specifications (step S7).

  Next, as shown in FIG. 5, the dimension D4 of the assembly surface 24a of the fixed piece 12 subjected to the step bending process and the contact surface dimension D5 ′ of the fixed contact 15 are measured by the displacement sensor 25-3. The difference D6 ′ (= D4−D5 ′) is calculated and given to the personal computer 22 (step S8).

  The personal computer 22 confirms that the target step bending amount is reached (step S9), and incorporates a fixed piece corresponding to each specification subjected to the step bending into a case in which a movable piece or the like is incorporated (step). S10) Product characteristics are inspected (step S11), and various products such as products F, G, and H are completed.

  In step S9, when the target step bending amount is not reached, a correction value for obtaining the target step bending amount is calculated, and the correction value is used for the subsequent step bending processing. To do.

  In this way, while measuring the position of the movable piece incorporated in the case, the position of the flat fixed piece is measured, and the product specification, that is, the amount of step bending according to the model is calculated from the measured value. Since the fixed piece is bent to the case by the amount of processing, it is built into the case, so one type of fixed piece can be used for various types of models, and there is no need to change equipment or lines for each model. .

  Next, the step bending process by the step bending device 26 will be described in detail. 6 to 11 are schematic configuration diagrams showing the step bending process by the step bending apparatus.

  A first clamping member 4 is provided on the device base 2. The first clamping member 4 is composed of a pair of upper and lower clamps 6 and 8. Both the clamps 6 and 8 are arranged up and down with their opposing surfaces (clamping surfaces) facing each other, and the upper clamp 6 is driven in the vertical direction by the first drive unit 10 and one end of the flat fixed piece 12. The both sides of the side 12a can be closely sandwiched and fixed without any gaps, and the recesses corresponding to the fixed contacts 15 are formed in the clamp 8.

  A second clamping member 14 is provided on the device base 2. The second clamping member 14 includes an upper punch 16 and a lower die 18. The punch 16 and the die 18 are individually moved in the vertical direction by the second driving unit 20 so that the other end side 12b of the fixed piece 12 can be tightly sandwiched without a gap.

  In this case, the clamping force of both sides of the one end side 12a of the flat fixing piece 12 by the first clamping member 4 is strong, and the both sides of the other end side 12b of the flat fixing piece 12 by the second clamping member 14 are clamped. The power is set weak.

  This setting can be performed by the first drive unit 10 and the second drive unit 20.

  For example, in the 1st drive part 10, a 1st clamping member is driven with a motor and a gear, and both surfaces of the one end side 12a of the flat fixing piece 12 are clamped and fixed with a strong clamping force.

  For example, in the 2nd drive part 20, both surfaces of the other end side 12b of the flat fixed piece 12 are clamped with weak clamping force with dampers, such as an air cylinder.

  Next, the operation will be described with reference to FIGS.

  First, as shown in FIG. 6, the one end side 12 a of the flat fixing piece 12 is placed between the clamps 6 and 8 while being placed on the clamping surface of the lower clamp 8 of the first clamping member 4. The other end side 12 b of the fixed piece 12 is disposed between the die 18 and the punch 16 of the second clamping member 14.

  Next, as shown in FIG. 7, the upper clamp 6 of the first clamping member 4 is driven downward by the first drive unit 10, and the clamps 6, 8 are in close contact with both surfaces of the one end side 12 a of the fixed piece 12. Secure with pinch. This clamping force is a force set so strong that the fixed piece 12 cannot move.

  On the other hand, the die 18 and the punch 16 of the second sandwiching member 14 are moved up and down by the second drive unit 20, so that both surfaces of the other end 12 b of the fixed piece 12 are in close contact with the die 18 and the punch 16 with no weak gap. Clamp in the state.

  Here, the clamping force of the first clamping member 4 is a force that can fix the one end side 12 a of the fixing piece 12 even when the second clamping member 14 is raised.

  The clamping force of the second clamping member 14 is such a force that the other end side 12 b of the fixed piece 12 can slide between the opposing surfaces of the die 18 and the punch 16. Therefore, the surface roughness of the opposing surface of the die 18 and the punch 16 may be a mirror surface. Further, the other end 12b of the fixed piece 12 can be slid in a close contact state with no gap between the opposing surfaces of the die 18 and the punch 16.

  Here, of the boundary portion sandwiched on one end side 12 a of the fixed piece 12, the upper side is the folding start point A and the lower side is the folding start point B, and the other end side 12 b of the fixed piece 12 is sandwiched. Of the boundary portion, the upper side is a folding start point C and the lower side is a folding start point D.

  Next, as shown in FIG. 8, the die 18 and the punch 16 of the second clamping member 14 are synchronously lowered integrally in the downward direction in a state where the both surfaces of the other end side 12b of the fixed piece 12 are in close contact with each other without a gap. Let By this downward movement, the flat fixed piece 12 is bent stepwise.

  In this case, the one end side 12a of the fixing piece 12 is bent in a state where it is closely fixed with no gap between the clamps 6 and 8 of the first clamping member 4.

  On the other hand, the other end side 12b of the fixed piece 12 is bent in a state in which it is tightly sandwiched between the die 18 of the second sandwiching member 14 and the punch 16 without a gap.

  Therefore, as shown in an enlarged view of the portion surrounded by a circle in FIG. 8, the upper bending start point A on the one end side 12a of the fixed piece 12 is bent and deformed to the expansion side, and the lower bending start point B is bent and deformed to the contraction side. To do. The upper bending start point C on the other end side 12b of the fixed piece 12 is bent and deformed to the contraction side, and the lower bending start point D is bent and deformed to the extension side.

  The shape of the above bending deformation is symmetrical between the one end side 12a side of the fixed piece 12 and the other end side 12b of the fixed piece 12, and is the same bending deformation. This is a feature of the step bending according to the embodiment. The same bending deformation occurs because the clamps 6 and 8 of the first sandwiching member 4 and the die 18 and punch 16 of the second sandwiching member 14 from the start to the end of the step bending process are fixed to the fixed piece 12. By maintaining the state of being tightly sandwiched with no gap between the one end side 12a and the other end side 12b, the sandwiching members 4 and 14 are moved relative to each other in parallel to the step bending direction.

  Next, as shown in FIG. 9, the die 18 and the punch 16 of the second sandwiching member 14 are moved up and down by the second drive unit 20, and the other end side 12 b of the fixed piece 12 is sandwiched by the second sandwiching member 14. Is released.

  Next, as shown in FIG. 10, the clamping of the first clamping member 4 is lifted by the first driving unit 10 to release the clamping of the one end side 12 a of the fixed piece 12.

  Finally, as shown in FIG. 11, the fixed piece 12 that has been step-bended is taken out from the step-bending device of the embodiment.

  As described above, it is possible to bend the flat fixed piece 12 using the step bending apparatus according to the embodiment.

  In particular, it is possible to bend the fixed piece 12 simply by relatively moving both the sandwiching members 4 and 14 in the step bending height direction of the fixed piece 12, so that the step bending operation is extremely simple and takes time. It can be done easily and quickly.

  Even if the fixing piece 12 is taken out from the step bending apparatus after the step bending is completed, the parallelism between the step surfaces corresponding to the one end side 12a and the other end side 12b of the fixing piece 12 is maintained. The detailed reason why the parallelism between the two step surfaces is maintained will be described later.

  In the step bending, by setting a parallel movement distance in the step bending height direction of the second sandwiching member 14, various step bending heights (step bending amount) can be fixed from one type of flat fixing piece 12. A piece 12 can be formed. For example, FIG. 12A shows the step bending height H1, FIG. 12B shows the step bending height H2, and FIG. 12C shows each fixing piece 12 having the step bending height H3. In the above description, the step bending height has been described with three types of H1, H2, and H3 for the sake of understanding of the description. Of course, the step bending height can be arbitrarily set at a further level. Since the step bending height can be set arbitrarily, the step bending angle can also be set arbitrarily.

  The step bending height can be arbitrarily set by manual control or automatic control. As the manual control, when the user manually drives the first and second driving units 10 and 20, the second sandwiching member 14 is moved in the step bending height direction by the user operation with respect to the first sandwiching member 4. This can be done by parallel movement while referring to an appropriate scale. As the automatic control, for example, it can be set by a sequencer (registered trademark) or a personal computer.

  FIG. 13 is a configuration diagram in the case of control by the personal computer 22 of FIG. 4 described above.

  The personal computer 22 includes, for example, a control unit 22a that controls driving of the first and second clamping members 4 and 14 by controlling driving of the first and second driving units 10 and 20 each composed of a motor. , A program memory 22b in which the program is stored, and step bending height (step bending amount) data (for example, data in which the step bending height can be determined by the number of pulses or the number of steps indicating the rotation amount of the control motor). Is stored in the data memory 22c, and an input unit 22d to which the measured values from the displacement sensors 25-1 to 25-3 are given. The step bending amount data may be stored as a database on a hard disk or the like.

  FIG. 14 is a flowchart for explaining the operation of the personal computer 22, and parts corresponding to the steps in FIG.

  Measurement is performed by the displacement sensor 25-1 on the case in which the movable piece is incorporated, and from the reference surface 24 on which the fixed piece is assembled to the contact surface of the movable contact 13 as shown in FIG. Distance D3 is calculated and given to the personal computer 22 (step S3).

  Measurement is performed on the flat fixed piece 12 by the displacement sensor 25-2. As shown in FIG. 3B, the distance D6 from the assembly surface 24a of the fixed piece 12 to the contact surface of the fixed contact 15 is measured. Is calculated and given to the personal computer 22 (step S5).

  The personal computer 22 calculates the target step bending amount (= D−D3 + D6) based on the distances D3 and D6 given from the displacement sensors 25-1 and 25-2 and the contact distance D corresponding to the DF characteristics of the model to be produced. ) Is calculated, and the drive of the first and second drive units 10 and 20 is controlled so that the target step bending amount is obtained (step S6).

  As a result, the first and second driving units 10 and 20 are driven to perform step bending of the flat fixed piece (step S7).

  Next, measurement is performed by the displacement sensor 25-3 with respect to the fixed piece subjected to the step bending, and as shown in FIG. 5 described above, the fixed contact 15 from the assembly surface 24a of the fixed piece 12 subjected to the step bending. The distance D6 ′ to the contact surface is calculated and given to the personal computer 22 (step S8).

  The personal computer 22 calculates a difference ΔX between the actual step bending process result (= D−D3 + D6 ′) and the target step bending process amount (= D−D3 + D6), and this difference is within a predetermined standard. After confirming that it is present (step S9), the fixed piece subjected to the step bending process is incorporated into a case in which a movable piece or the like is incorporated (step S10).

  In step S9 described above, when the difference ΔX is not within the predetermined standard, it is fed back to the next step bending amount as a correction value.

  Next, referring to FIG. 15 to FIG. 22, the step surfaces formed on the one end side 12 a of the fixed piece 12 and the other end side 12 b of the fixed piece 12 are kept parallel to each other by the step bending device of the embodiment. Explain why.

  FIG. 15 shows a state in which the first clamping member 4 is clamped in a state of being in close contact with both surfaces of the one end side 12a of the flat fixed piece 12 without a gap. In this state, the other end 12 b of the fixed piece 12 is not sandwiched by the second sandwiching member 14.

  Next, as shown in FIG. 16, the other end side 12 b of the fixed piece 12 is bent by narrowing the distance between the die 18 of the second sandwiching member 14 and the punch 16. In this case, the both sides of the other end side 12b of the fixed piece 12 and both the opposite surfaces of the die 18 and the punch 16 are sandwiched between the die 18 and the punch 16 of the second clamping member 14 in this case. And the die 18 and the punch 16 are not in close contact with both surfaces of the other end side 12b of the fixed piece 12, and there is a gap.

  In FIG. 16, the one end side 12 a of the fixed piece 12 and the other end side 12 b of the fixed piece 12 are bent, but the fixed piece 12 with respect to the bending start points A and B on the one end side 12 a of the fixed piece 12. The bending start points C and D on the other end side 12b are not symmetrical and have different bending deformation shapes.

  Next, as shown in FIG. 17, both sides of the other end side 12b of the fixed piece 12 are sandwiched between the slide surfaces of both slide members, and the one end side 12a of the fixed piece 12 and the other end side 12b of the fixed piece 12 are bent.

  Finally, as shown in FIG. 18, when the fixed piece 12 is taken out from the clamp mechanism and the slide mechanism, the stepped surface of the other end side 12b of the fixed piece 12 is spring-backed so that the tip of the fixed piece 12 as shown by the solid line from the virtual line It is folded. That is, the two step surfaces of the fixed piece 12 are not parallel.

  Thus, the parallelism of the two step surfaces of the fixed piece 12 cannot be maintained because the other end side 12b of the fixed piece 12 with respect to the bending start points A and B on the one end side 12a of the fixed piece 12 in FIG. The bending starting points C and D are not symmetrical, and are caused by the uneven distribution of the springback due to the difference in the shape of bending deformation.

  In contrast, an embodiment will be described with reference to FIGS. In the embodiment, first, as shown in FIG. 19, in the flat state where the fixing piece 12 is not bent, the first clamping member 4 and the second clamping member 14 respectively have one end side 12a of the fixing piece 12 Each of the other end sides 12b of the fixed piece 12 is sandwiched.

  In this clamping state, both clamps of the first clamping member 4 are in close contact with each other on both sides of the one end side 12a of the fixed piece 12, and the die 18 and the punch 16 of the second clamping member 14 are in contact with each other. The both sides of the other end side 12b of the fixed piece 12 are in close contact with no gap.

  In this case, both clamps of the first clamping member 4 are in close contact with the one end side 12a of the fixed piece 12, and the die 18 and the punch 16 of the second clamping member 14 are connected to the other end side 12b of the fixed piece 12. It is in a close state with weak force.

  Then, as shown in FIG. 20, in the process from the start to the end of the step bending process, the both sides of the other end side 12b of the fixed piece 12 are clamped by the both clamping members 4 and 14 in a state where there is no gap. 2 When the clamping member 14 is lowered, the fixed piece 12 is bent in the same shape symmetrical with each other at the folding start points A and B on the one end side 12a and the other end side 12b as described above. It is done.

  Therefore, when the bending deformation is completed in FIG. 21 and the fixing piece 12 is taken out, the fixing piece 12 maintains the parallelism of the step surfaces of the one end side 12a and the other end side 12b of the fixing piece 12 as shown in FIG. It has become. In this case, even if the springback occurs, the one end side 12a of the fixed piece 12 and the other end side 12b of the fixed piece 12 are both symmetrical with the same bending deformation. The parallelism of the step surfaces on the side 12a and the other end 12b is maintained.

  The present invention is not limited to a switch, and can be applied to a product in which a pair of parts are assembled to a case, for example, a relay or other products.

  The present invention is useful for manufacturing a microswitch and the like.

It is sectional drawing of the microswitch manufactured by the manufacturing method which concerns on this invention. It is a disassembled perspective view of the principal part of FIG. It is a figure for demonstrating the process of the principal part of the manufacturing method of this invention. It is a figure which shows the flow of the production process using the manufacturing method which concerns on this invention. It is a figure for demonstrating the measurement of the dimension of the fixed piece after level | step difference bending. It is a figure which shows the level | step difference bending apparatus which concerns on embodiment of this invention in the state by which the fixed piece is arrange | positioned. It is a figure which shows a level | step difference bending apparatus in the state which has clamped the fixing piece with two clamping members. It is a figure which shows the level | step difference bending apparatus in the state which carries out the level | step difference bending process of the fixing piece with two clamping members. It is a figure which shows the state which cancel | released clamping of the fixed piece with a 2nd clamping member after completion | finish of a level | step difference bending apparatus. It is a figure which shows the level | step difference bending apparatus in the state which cancelled | released clamping of the fixed piece with both clamping members after completion | finish of level | step difference bending. It is a figure which shows a step bending apparatus in the state which takes out a fixed piece after completion | finish of a level | step difference bending. FIG. 12A is a view showing each fixing piece having a step bending height H1, FIG. 12B is a step bending height H2, and FIG. 12C is a step bending height H3. It is a block diagram of the control apparatus of a level | step difference bending apparatus. It is a flowchart with which operation | movement description is provided. It is a figure which shows another level | step difference bending apparatus which the present applicant devised in the state by which the fixed piece is arrange | positioned. It is a figure which shows the state in the middle of bending the level | step difference by pinching | fixing a fixed piece with two clamping members, and said another level | step difference bending apparatus. It is a figure which shows the state which carried out the level | step difference bending process of the fixing piece with the two clamping members of the said another level | step bending apparatus. It is a figure which shows the fixed piece by which the level | step difference bending was carried out with the said another level | step difference bending apparatus. It is a figure which shows the level | step difference bending apparatus of embodiment in the state which has clamped the fixed piece with both clamping members. It is a figure which shows the level | step difference bending apparatus of embodiment in the state in the middle of carrying out the level | step difference bending of the fixing piece with two clamping members. It is a figure which shows the level | step difference bending apparatus of embodiment in the state which carried out the level | step difference bending process of the fixing piece with two clamping members. It is a figure which shows the fixing piece by which the level | step difference bending apparatus of embodiment bent the level | step difference. It is a figure which shows the structure of the contact vicinity of a microswitch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower case 2 Apparatus stand 4 1st clamping member 6,8 Clamp 9 Movable piece 10 1st drive part 12 Fixed piece 12a One end side 12b The other end side 14 2nd clamping member 16 Punch 18 Die 20 2nd drive part

Claims (9)

A method of manufacturing a product in which at least a pair of parts is assembled to a case,
Based on the positional relationship with the other component, one component side of the pair of components and the other end are arranged such that the facing interval between the pair of components is a required interval. One part is obtained by bending the step to a predetermined step so that the step surfaces of
One part obtained is assembled to the case so as to face the other part ,
The one part material is a flat thin plate material,
In the step bending process, a first sandwiching member that tightly sandwiches both surfaces of one end of the flat thin plate material without any gap, and both surfaces of the other end of the flat thin plate member are disposed on the first sandwiching member. A second clamping member that clamps closely with no clamping force with a clamping force weaker than the clamping force, and clamps both the clamping members without gaps from the start to the end of step bending A method for producing a product, characterized in that it is carried out using a step bending apparatus that can hold and move relative to the step bending direction . A method of manufacturing a switch in which a fixed piece having a fixed contact and a movable piece having a movable contact contacting and separating from the fixed contact are incorporated in a case,
One kind of fixed piece material is formed so that the step surface between one end side and the other end side thereof is such that the contact distance between the fixed contact and the movable contact is a required contact distance corresponding to each model individually. Bending the step to a predetermined step so as to be parallel to form the fixed piece, and assembling the fixed piece to the case ;
The step bending process includes a first sandwiching member for tightly sandwiching both surfaces of one end of a flat fixed piece, which is one type of fixed piece material, without gaps, and both surfaces of the other end of the flat fixed piece. And a second sandwiching member that tightly sandwiches the first sandwiching member with a sandwiching force that is weaker than the sandwiching force of the first sandwiching member, and the gap between the sandwiching members from the start to the end of the step bending process. A method of manufacturing a switch, characterized in that the method is performed using a step bending apparatus that can maintain a state of being closely sandwiched and can be relatively moved parallel to the step bending direction . A first step of preparing in advance the flat fixed piece having the fixed contact on the one end side or the other end side;
A second step of obtaining a contact interval between the movable contact and the fixed contact of the flat fixed piece when the flat fixed piece is assumed to be assembled to the case;
A third step of calculating a processing amount of the step bending process necessary to make the determined contact interval the required contact interval;
A fourth step of bending the flat fixed piece according to the calculated processing amount;
The manufacturing method of the switch of Claim 2 containing this. The second step includes a step of obtaining a first distance, a step of obtaining a second distance, and a step of calculating the contact interval from the first and second distances,
The first distance is a distance between the movable contact of the movable piece corresponding to the operating state assembled to the case and a reference surface of the case to which the fixed piece is assembled,
The switch manufacturing method according to claim 3 , wherein the second distance is a distance between a fixed contact of the flat fixed piece and an assembly surface of the flat fixed piece with respect to the reference surface. In the step of obtaining the first distance, the position of the movable contact of the movable piece corresponding to the operation state assembled to the case is measured by a sensor, and the position of the reference surface to which the fixed piece is assembled is measured by the sensor. And calculating the first distance from both the measured positions,
In the step of obtaining the distance of 2, the position of the fixed contact of the flat fixed piece is measured by a sensor, while the position of the assembly surface of the fixed piece with respect to the reference surface is measured by the sensor, and the measured both positions The method of manufacturing a switch according to claim 4 , wherein the second distance is calculated from the value. A fixed piece having a fixed contact, and a movable piece having a movable contact contacting and separating from the fixed contact, the fixed piece of the switch incorporated in the case, and a flat fixed having the fixed contact on one end side or the other end side. A step bending apparatus that is manufactured by bending a step from a piece,
A first sandwiching member that tightly sandwiches both surfaces of the one end side of the flat fixed piece without any gap, and both surfaces of the other end side of the flat fixed piece are sandwiched more than the sandwiching force of the first sandwiching member. A second clamping member that clamps closely without gaps with a weak clamping force;
The both clamping members can be relatively moved in parallel with the step bending direction while maintaining a state in which the both clamping members are closely clamped without any gap from the start to the end of the step bending process. Step bending machine. The step bending apparatus according to claim 6 , wherein the first clamping member is movable in parallel relative to the second clamping member. Control means capable of steplessly controlling the amount of the step bending process is provided, and the control means determines a required contact interval from a measured value of the flat fixed piece and the movable piece incorporated in the case. A control unit for calculating a predetermined step required for the flat fixed piece, and a control unit for bending the flat fixed piece steplessly to the predetermined step by controlling an actuator; A step bending apparatus according to claim 6 or 7 , comprising: The control means fetches and imports the corresponding required contact interval data from the database storing the required contact interval data individually corresponding to each switch model according to the switch model change. The step bending apparatus according to claim 8 , wherein the step bending amount is changed so that a required contact distance is obtained.

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