JP2013139111A - Processing device for processing resin molding and method for manufacturing processed product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology which can increase the processing accuracy of a processing target of resin molding.SOLUTION: A processing device includes: a pressing part that is heated and presses the processing target region of the resin molding to melt the part; a drive unit for moving the pressing part toward the processing target region; and a control unit for controlling the processing device. The control unit calculates a melting starting point at which the processing target region starts to be melted based on a displacement rate of displacement caused in the pressing part, presses the pressing part ahead by a predetermined amount with respect to the processing target region based on a reference position where the pressing part is positioned at the time of melting starting point and then stops the movement of the pressing part moving toward the processing target region.

Description

  The present invention relates to a processing apparatus for processing a resin molded product, and a method for manufacturing a processed product of a resin molded product.

  2. Description of the Related Art Conventionally, techniques for processing by pressing a heated pressing portion against a processing target portion of a resin molded product are known (for example, Patent Documents 1 and 2). For example, in the technique of Patent Document 1, the protrusion is melted and thermally deformed by pressing a heated pressing portion against a protrusion provided on a thermoplastic resin component.

JP 2008-155487 A JP 2008-168437 A

  Here, conventionally, when a part to be processed of a resin molded product is heated and melted, it may be difficult to accurately process the target melt height. Here, the melting height is a value obtained by subtracting the height (length) of the processing target part after melting from the height (length) of the processing target part before melting, and the processing target part actually melts. Represents the height (length).

  If it is not possible to accurately process the melt height targeted for the part to be processed, the quality of the processed product may be affected. For example, when the diameter of the tip is increased by melting the tip of the protrusion and other parts are attached to the protrusion, if the actual height of the processed product is smaller than the target melt height, There is a risk that the part may come off the protrusion.

  The inventors of the present invention have found that elastic deformation at the processing target part when pressing the processing target part is one of the reasons that the target melting height cannot be processed. That is, at the stage immediately after the pressing part presses the processing target part, the displacement amount of the pressing part is mainly caused by the elastic deformation of the processing target part, and the displacement amount of the pressing part generated thereafter is mainly the processing target part. Was found to be caused by melting. Therefore, when the displacement amount of the pressing part after pressing the part to be processed is the melt height, there is a possibility that the target melt height cannot be processed with high accuracy.

  The above-mentioned problems are not limited to the processing apparatus for heating and melting the protrusions and crimping them, but are melted by pressing the heated pressing part against the processing target part of the resin molded product. This was a problem common to the processing equipment to be processed.

  Therefore, an object of this invention is to provide the technique which can improve the processing precision of the process target site | part of a resin molded product.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1] A processing apparatus for processing a resin molded product,
A pressing portion that is heated and melted by pressing a portion to be processed of the resin molded product;
A drive unit for moving the pressing unit toward the processing target site;
A control unit for controlling the processing apparatus,
The controller is
Based on the displacement rate at which the pressing portion is displaced, calculate a melting start point that is a point in time when melting of the processing target site is started,
Based on a reference position that is the position of the pressing portion at the melting start point, after the pressing portion has been pushed a predetermined amount against the processing target portion, the movement of the pressing portion toward the processing target portion is stopped. Processing equipment.
According to the processing apparatus described in Application Example 1, the melting start point is calculated, and the pressing portion is pushed by a predetermined amount based on the reference position that is the position of the pressing portion at the melting start point. Thereby, the processing precision of a process target site | part can be improved by handling predetermined amount as melt | dissolution height. That is, the processing apparatus can perform processing on the processing target portion in consideration of the displacement amount of the pressing portion caused by elastic deformation of the processing target portion.

[Application Example 2] The processing apparatus according to Application Example 1,
The control unit is capable of receiving from the user the melt height that is the melt height of the processing target portion and that is the length along the moving direction of the pressing portion as the predetermined amount,
The said predetermined amount is a processing apparatus which is the length from the said reference position to the position where the said press part is pushed with respect to the said process target site | part.
According to the processing apparatus described in the application example 2, by setting the length from the reference position to the pushed-in position to a predetermined amount, it is possible to accurately process the processing target portion to the target melt height.

[Application Example 3] The processing apparatus according to Application Example 1 or Application Example 2,
The controller is
While pressing the processing object part by the pressing part using a first condition including a first thrust for pushing the pressing part as a condition, the displacement ratio is calculated,
A processing apparatus that calculates the melting start point based on a point in time when the displacement ratio under the first condition becomes equal to or less than a first threshold value.
According to the processing apparatus described in Application Example 3, the melting start point can be easily calculated based on the displacement ratio.

[Application Example 4] The processing apparatus according to Application Example 3,
The controller is
The second thrust for pushing the pressing portion forward and including a second thrust that is lower than the first thrust as a condition, the processing target portion arranged at a distance from the second thrust While pushing the pressing part toward the part to be processed, the displacement ratio is calculated,
Based on the time point when the displacement ratio under the second condition is equal to or less than a second threshold value, the contact point where the pressing portion is in contact with the processing target site is calculated,
The processing apparatus which presses the said process target site | part by the said press part using the said 1st condition after calculating the said contact point.
According to the processing apparatus described in the application example 4, the contact point is calculated before the processing target portion is pressed using the first condition. Thereby, the process using the 1st conditions for melting a processing object part on the basis of the time when the press part contacted the process object part for every resin molded product can be given. In addition, by calculating the position of the pressing portion at the contact point, it is possible to grasp the variation in the shape of the part to be processed for each of a plurality of resin molded products manufactured.

Application Example 5 A manufacturing method for manufacturing a processed product of a resin molded product by melting a processing target portion of a resin molded product by pressing it with a heated pressing unit provided in a processing apparatus. ,
A melting point calculating step of calculating a melting start point, which is a time point at which melting of the processing target portion starts, based on a displacement ratio in which the processing target portion is pressed by the pressing portion and the pressing portion is displaced;
After the melting point calculation step, based on a reference position that is the position of the pressing portion at the melting start point, the pressing portion is pushed forward by a predetermined amount with respect to the processing target portion, and then heads toward the processing target portion. And a melting step for stopping the movement of the pressing portion.
According to the manufacturing method described in Application Example 5, the melting start point is calculated, and the pressing portion is pushed by a predetermined amount based on the reference position that is the position of the pressing portion at the melting start point. Thereby, the processing precision of a process target site | part can be improved by handling predetermined amount as melt | dissolution height. That is, the processing apparatus can perform processing on the processing target portion in consideration of the displacement amount of the pressing portion caused by elastic deformation of the processing target portion.

[Application Example 6] The manufacturing method according to Application Example 5,
The processing device is capable of receiving the melt height as the predetermined amount, which is the melt height of the part to be processed and is a length along the moving direction of the pressing portion,
The predetermined amount is a length from a position of the pressing portion at the melting start point to a position where the pressing portion is pressed into the processing target portion.
According to the manufacturing method described in Application Example 6, by setting the length from the reference position to the pushed-in position as a predetermined amount, it is possible to process the processing target portion with high accuracy to the target melt height.

[Application Example 7] The manufacturing method according to Application Example 5 or Application Example 6,
The melting point calculation step includes
While pressing the processing object part by the pressing part using a first condition including a first thrust for pushing the pressing part as a condition, the displacement ratio is calculated,
The manufacturing method of calculating the melting start point based on a time point when the displacement ratio under the first condition becomes equal to or less than a first threshold value.
According to the manufacturing method described in Application Example 7, the melting start point can be easily calculated based on the displacement ratio.

[Application Example 8] The manufacturing method according to Application Example 7, further comprising:
Before the melting point calculating step, the contact point that is the point in time when the pressing unit is moved toward the processing target site that is arranged away from the pressing unit and the pressing unit contacts the processing target site. Including a contact point calculation step to calculate,
The contact point calculation step includes:
While pushing the pressing part toward the part to be processed using a second condition that is a second thrust for pushing the pressing part and includes a second thrust lower than the first thrust as a condition, Calculating the displacement ratio,
The manufacturing method which calculates the said contact point based on the time when the said displacement ratio under the said 2nd condition became below a 2nd threshold value.
According to the manufacturing method described in Application Example 8, the contact point calculation step is performed before the melting point calculation step. Thereby, the melting point calculation process using the 1st conditions for melting a processing object part can be performed on the basis of the time when the press part contacted the processing object part for every resin molded product. In addition, by calculating the position of the pressing portion at the contact point, it is possible to grasp the variation in the shape of the part to be processed for each of a plurality of resin molded products manufactured.

  The present invention can be realized in various forms. In addition to the above-described processing apparatus and method for manufacturing a processed product, a method for processing a resin molded product, a processed product manufactured by the above-described manufacturing method, and processing The present invention can be realized in the form of a computer program for controlling the apparatus. The computer program may be recorded on a computer-readable recording medium.

It is a figure for demonstrating the processing apparatus 1 as one Example of this invention. It is a control flow of the processing by the processing apparatus 1. It is a graph which shows the relationship between the displacement position of the press part 50, and time.

Next, embodiments of the present invention will be described in the following order.
A. Example:
B. Variations:

A. Example:
A-1. Overall configuration of processing equipment:
FIG. 1 is a view for explaining a processing apparatus 1 as an embodiment of the present invention. The processing apparatus 1 is an apparatus that melts and processes a thermoplastic resin molded product. Note that the vertical direction in FIG. 1 is the vertical direction. The downward direction is the vertical downward direction.

  The processing apparatus 1 includes a pressing unit 50, a driving unit 10, a control unit 30, and a housing 20. The pressing unit 50 is configured to be able to be heated by being supplied with an electric current by the control unit 30 that is electrically connected. For example, a heating wire is arranged inside the pressing unit 50, and the pressing unit 50 is heated by flowing current from the control unit 30 electrically connected to the heating wire to the heating wire. The thermoplastic resin molded product 90 is disposed on the mounting table 22 in the housing 20. The heated pressing portion 50 melts the processing target portion 92 by contacting and heating the processing target portion 92 of the resin molded product 90. The pressing unit 50 is heated to a temperature equal to or higher than the melting point of the processing target portion 92.

  Here, the resin molded product 90 is a resin molded product made of a thermoplastic resin. For example, the processing apparatus 1 inserts a protrusion provided on the resin molded product 90 into a hole provided in a metal plate, melts the tip of the protrusion, and increases the diameter of the tip, thereby increasing the diameter of the metal plate. It can be used when attaching. In this case, the protrusion becomes the processing target portion 92. Further, for example, the processing apparatus 1 can also be used when a resin film is attached to close an opening provided in the resin molded product 90. In this case, the processing target portion 92 is a portion where the resin molded product 90 and the resin film are in contact.

  The drive unit 10 is a motor-driven linear actuator. The drive unit 10 moves the shaft unit 12 as an output shaft. Thereby, the press part 50 attached to the axial part 12 moves. That is, the drive unit 10 moves the pressing unit 50 toward the processing target portion 92 of the resin molded product 90. In the present embodiment, the shaft portion 12 moves in the vertical direction Yr. The drive unit 10 is not limited to a motor-driven linear actuator, and various actuators can be used.

  Moreover, the processing apparatus 1 is provided with the displacement detection part (not shown) utilized in order to detect the displacement of the press part 50. FIG. The displacement position of the pressing unit 50 may be directly detected by the displacement detection unit using, for example, an encoder in the displacement sensor. Further, for example, the displacement position of the pressing portion 50 may be configured to indirectly detect the movement distance from the home position (processing start position) of the shaft portion 12 using a displacement sensor provided outside. That is, a configuration in which the moving distance of the shaft portion 12 is handled as the displacement amount of the pressing portion 50 may be used. Furthermore, the processing apparatus 1 includes a temperature sensor (not shown) for detecting the temperature of the pressing portion 50 and a load sensor (not shown) for detecting the load applied to the resin molded product 90 by the pressing portion 50. Is provided. Furthermore, the processing apparatus 1 includes a time measuring device (not shown) that measures time.

  The control unit 30 controls the processing apparatus 1. Specifically, the control unit 30 includes a heating control unit 32, a drive control unit 34, a displacement ratio calculation unit 38, and an operation display unit 31.

  The heating control unit 32 controls the heating temperature of the pressing unit 50. The drive control unit 34 controls the movement of the pressing unit 50. That is, the drive control unit 34 controls the thrust (also referred to as “pressing force”) applied to the pressing unit 50 by the driving unit 10. The displacement ratio calculation unit 38 calculates the contact point Pc and the melting start point Pr. The contact point Pc is an index that represents a point in time when the pressing unit 50 contacts the processing target portion 92. In addition, the melting start point Pr is an index that represents a point in time when the processing target portion 92 has started melting. The displacement rate calculation unit 38 calculates a displacement rate that is a rate at which the pressing unit 50 is displaced in a predetermined time. Specifically, the displacement ratio calculation unit 38 calculates the displacement ratio based on the data of the time measuring device and the displacement sensor. Here, the displacement ratio calculation unit 38 may directly calculate the displacement ratio of the pressing part 50, or the displacement ratio (movement ratio) of the shaft part 12 to which the pressing part 50 is attached is the displacement ratio of the pressing part 50. May be calculated as The operation display unit 31 controls a monitor (not shown) provided in the processing apparatus 1. The user inputs the processing conditions such as the heating temperature of the pressing unit 50 and the melt height of the processing target portion 92 to the processing apparatus 1 via the monitor. However, it may be input without going through a monitor. The input machining conditions are stored by the control unit 30. Here, the melting height is a value obtained by subtracting the height (length) of the processing target portion 92 after melting from the height (length) of the processing target portion 92 before melting. That is, the melt height represents a height (length) at which the processing target portion 92 is actually melted.

  In the present embodiment, the control unit 30 controls the machining apparatus 1 under the second condition until machining is started and the contact point Pc is calculated. Further, in this embodiment, the control unit controls the processing apparatus 1 under the first condition until the processing target portion 92 is processed to the set melt height after the contact point Pc is calculated. The first condition and the second condition are preset in the control unit 30 by the user.

  Here, the first condition includes, as a condition, a first thrust for pushing the pressing portion 50 toward the processing target portion 92 by the driving portion 10. The first condition includes the heating temperature of the pressing unit 50 as a condition. The second condition includes, as a condition, a second thrust for pushing the pressing portion 50 toward the processing target portion 92 by the driving portion 10. Further, the second condition includes the heating temperature of the pressing unit 50 as a condition. The first condition and the second condition are different in terms of the magnitude of thrust for pushing the pressing portion 50 forward. That is, in the present embodiment, the first condition and the second condition are the same except for the condition related to the thrust. The second thrust is set lower than the first thrust. Therefore, the first thrust is also called “high thrust”, and the second thrust is also called “low thrust”. For example, the second thrust is set to a value that does not cause the elastic deformation of the processing target portion 92 due to the load applied by the pressing unit 50 to the processing target portion 92. Further, for example, the first thrust is set to a value that allows the processing target portion 92 to be sufficiently melted by being pressed by the pressing portion 50. In this embodiment, the first thrust is set to 250N, and the second thrust is set to 50N. In the present embodiment, the maximum thrust of the processing apparatus 1 is 500N.

A-2. Detailed explanation of processing:
FIG. 2 is a control flow of processing performed by the processing apparatus 1. FIG. 3 is a graph showing the relationship between the displacement position of the pressing portion 50 and time. The horizontal axis in FIG. 3 represents the time since the pressing portion 50 is pushed toward the resin molded product 90, and the vertical axis represents the displacement position of the pressing portion 50 from the home position (processing start position). The details of the processing will be described with reference to FIGS.

  As shown in FIG. 2, when the processing of the resin molded product 90 by the processing apparatus 1 is started, the heating control unit 32 heats the pressing unit 50 to a predetermined temperature equal to or higher than the melting point of the processing target portion 92 (step S10). ). Note that, until step S60 described later is completed, the heating control unit 32 performs temperature control so that the pressing unit 50 maintains a predetermined temperature. After the pressing unit 50 reaches a predetermined temperature, the drive control unit 34 uses the driving unit 10 to push the pressing unit 50 toward the processing target region 92 with a low thrust (step S20). Next, the displacement rate calculation unit 38 calculates the contact point Pc based on the displacement rate of the pressing unit 50 while pushing the pressing unit 50 with a low thrust (step S30). Specifically, the displacement ratio calculation unit 38 calculates the contact point Pc based on the time when the displacement ratio becomes equal to or less than the second threshold value. For example, the time when the displacement of the pressing portion 50 during the time Tp becomes equal to or less than Lp is calculated as the time when the pressing portion 50 contacts the processing target portion 92 (contact point Pc). As shown in FIG. 3, in this embodiment, the displacement ratio calculation unit 38 calculates the time t1 and the time point of the displacement position L1 as the contact point Pc.

  As shown in FIG. 2, until the contact point Pc is calculated, the pressing portion 50 is lowered toward the processing target portion 92 with low thrust. When the displacement ratio calculation unit 38 calculates the contact point Pc (step S30: YES), the drive control unit 34 then uses the drive unit 10 to push the pressing unit 50 against the processing target portion 92 with high thrust (step S40). ), The displacement rate calculation unit 38 calculates the melting start point Pr based on the displacement rate of the pressing unit 50 (step S50). Specifically, the displacement ratio calculation unit 38 calculates the melting start point Pr based on the time when the displacement ratio becomes equal to or less than the first threshold value. For example, the time when the displacement amount of the pressing portion 50 during the time Tr becomes Lr or less is calculated as the melting start point Pr. As shown in FIG. 3, in this embodiment, the time t3 and the time point of the displacement position L3 are calculated as the melting start point Pr. Note that the start point (time t2, displacement position L2) at which the displacement ratio is equal to or less than the first threshold value may be calculated as the melting start point Pr.

  As shown in FIG. 2, when the melting start point Pr is calculated (step S50: YES), a reference position, which is a displacement position of the pressing portion 50 at the melting start point Pr, is calculated, and the pressing portion 50 is moved to the portion 92 to be processed. Is pushed from the reference position by a predetermined amount (step S60). Here, the predetermined amount is the melt height previously input to the processing apparatus 1 by a user or the like. For example, when processing the melt height as the value Lg, the processing apparatus 1 pushes the pressing portion 50 into the processing target portion 92 by a value Lg that is a predetermined amount from the melting start point Pr (FIG. 3).

  As shown in FIG. 2, after step S <b> 60, the movement of the pressing unit 50 toward the processing target portion 92 is stopped. Specifically, the control unit 30 stops the heating of the pressing unit 50 and raises the shaft unit 12 to move the pressing unit 50 to the home position, thereby finishing the processing (step S70).

A-3. effect:
As shown in FIG. 3, when the pressing portion 50 is pushed forward with high thrust after the pressing portion 50 comes into contact with the processing target portion 92, there is a time point (time point Ps in FIG. 3) where the displacement ratio is greatly different. This time Ps is also referred to as a change point Ps. The inventors found that the amount of displacement of the pressing portion 50 after the pressing portion 50 contacts the processing target portion 92 is mainly due to the elastic deformation of the processing target portion 92, and the pressing portion 50 after the change point Ps. It has been found that the displacement amount is caused by the fact that the processing target portion 92 is melted. That is, the displacement amount Le from the displacement position L1 to the displacement position L2 is an amount that the pressing portion 50 has moved mainly due to the elastic deformation of the processing target portion 92.

  As described above, in the processing of the present embodiment, the melting start point Pr is calculated based on the displacement ratio of the pressing portion 50, and a preset melt height is calculated from the position of the pressing portion 50 at the melting start point Pr. After the pressing portion 50 is pushed forward with respect to the processing target portion 92, the lowering of the pressing portion 50 is stopped (steps S50 to S60). Thereby, the melt height can be calculated in consideration of the elastic deformation of the processing target portion 92. Therefore, the processing accuracy of the processing target portion 92 can be improved. In addition, the length from the displacement position (reference position) of the pressing portion 50 at the melting start point Pr to the position where the pressing portion 50 is pressed is set to a predetermined amount (melting height), so that the target melting height is accurately obtained. The part 92 to be processed can be processed well. Further, the processing device 1 can easily calculate the melting start point Pr based on the displacement ratio of the pressing portion 50.

  Further, the processing apparatus 1 calculates the contact point Pc by pushing the pressing portion 50 toward the processing target portion 92 with a low thrust before pressing the pressing portion 50 with a high thrust to press the processing target portion 92. (Steps S20 and S30). Thereby, it is possible to perform processing using the first condition including, as a condition, high thrust for melting the processing target portion, with the time point when the pressing unit 50 contacts the processing target portion 92 as a reference. That is, it is possible to perform melt processing using the first condition with respect to the contact point Pc for resin molded products having different specifications. In addition, by calculating the contact point Pc, when a plurality of resin molded products 90 are manufactured, it is possible to grasp the variation in shape for each resin molded product 90. Further, the processing apparatus 1 calculates the contact point Pc using a low thrust lower than the high thrust used to melt the processing target portion 92 (steps S20 and S30). Thereby, the displacement ratio of the press part 50 after the press part 50 actually contacts the process target site | part 92 can be brought close to zero. In other words, the displacement rate can be changed abruptly before and after the pressing unit 50 contacts the processing target portion 92, and the contact point Pc can be easily calculated based on the displacement rate.

B. Variations:
As mentioned above, although one Example of this invention was described, this invention is not limited to such an Example, A various structure can be taken in the range which does not deviate from the meaning. For example, the following modifications are possible.

B-1. First modification:
In the said Example, although the heating of the press part 50 was performed before lowering the press part 50 with a low thrust (FIG. 2, step S10), it is not limited to this, After calculating the contact point Pc You can do it. Even if it does in this way, there exists an effect similar to the said Example. Alternatively, the heating of the pressing portion 50 may not be stopped (FIG. 2, step S70), and only the shaft portion may be raised, and step S20 and subsequent steps may be repeated for processing another resin molded product.

B-2. Second modification:
The calculation of the contact point Pc and the melting start point Pr may be performed based on the slope of the tangent line in the graph shown in FIG. That is, the displacement speed of the pressing portion 50 may be used as the displacement ratio.

B-3. Third modification:
In the above-described embodiment, the processing device 1 is used for processing the protrusions (resin pins) provided in the ink cartridge and for processing when a film is welded to the ink cartridge. It is not limited, It can use for the use which melts and processes the process target site | part of a resin molded product. For example, the processing apparatus 1 may be used when welding thermoplastic resins.

DESCRIPTION OF SYMBOLS 1 ... Processing apparatus 10 ... Drive part 12 ... Shaft part 20 ... Housing 22 ... Mounting stand 30 ... Control part 31 ... Operation display part 32 ... Heating control part 34 ... Drive control part 38 ... Displacement ratio calculation part 50 ... Pressing part 90 ... resin molded product 92 ... processed part Ps ... change point Pc ... contact point Pr ... melting start point

Claims (8)

A processing device for processing a resin molded product,
A pressing portion that is heated and melted by pressing a portion to be processed of the resin molded product;
A drive unit for moving the pressing unit toward the processing target site;
A control unit for controlling the processing apparatus,
The controller is
Based on the displacement rate at which the pressing portion is displaced, calculate a melting start point that is a point in time when melting of the processing target site is started,
Based on a reference position that is the position of the pressing portion at the melting start point, after the pressing portion has been pushed a predetermined amount against the processing target portion, the movement of the pressing portion toward the processing target portion is stopped. Processing equipment. The processing apparatus according to claim 1,
The control unit is capable of receiving from the user the melt height that is the melt height of the processing target portion and that is the length along the moving direction of the pressing portion as the predetermined amount,
The said predetermined amount is a processing apparatus which is the length from the said reference position to the position where the said press part is pushed with respect to the said process target site | part. The processing apparatus according to claim 1 or 2,
The controller is
While pressing the processing object part by the pressing part using a first condition including a first thrust for pushing the pressing part as a condition, the displacement ratio is calculated,
A processing apparatus that calculates the melting start point based on a point in time when the displacement ratio under the first condition becomes equal to or less than a first threshold value. The processing apparatus according to claim 3,
The controller is
The second thrust for pushing the pressing portion forward and including a second thrust that is lower than the first thrust as a condition, the processing target portion arranged at a distance from the second thrust While pushing the pressing part toward the part to be processed, the displacement ratio is calculated,
Based on the time point when the displacement ratio under the second condition is equal to or less than a second threshold value, the contact point where the pressing portion is in contact with the processing target site is calculated,
The processing apparatus which presses the said process target site | part by the said press part using the said 1st condition after calculating the said contact point. A manufacturing method for manufacturing a processed product of the resin molded product by melting the processing target portion of the resin molded product by pressing it with a heated pressing unit, which is a pressing unit provided in the processing apparatus,
A melting point calculating step of calculating a melting start point, which is a time point at which melting of the processing target portion starts, based on a displacement ratio in which the processing target portion is pressed by the pressing portion and the pressing portion is displaced;
After the melting point calculation step, based on a reference position that is the position of the pressing portion at the melting start point, the pressing portion is pushed forward by a predetermined amount with respect to the processing target portion, and then heads toward the processing target portion. And a melting step for stopping the movement of the pressing portion. It is a manufacturing method of Claim 5, Comprising:
The processing device is capable of receiving the melt height as the predetermined amount, which is the melt height of the part to be processed and is a length along the moving direction of the pressing portion,
The predetermined amount is a length from a position of the pressing portion at the melting start point to a position where the pressing portion is pressed into the processing target portion. It is a manufacturing method of Claim 5 or Claim 6,
The melting point calculation step includes
While pressing the processing object part by the pressing part using a first condition including a first thrust for pushing the pressing part as a condition, the displacement ratio is calculated,
The manufacturing method of calculating the melting start point based on a time point when the displacement ratio under the first condition becomes equal to or less than a first threshold value. The manufacturing method according to claim 7, further comprising:
Before the melting point calculating step, the contact point that is the point in time when the pressing unit is moved toward the processing target site that is arranged away from the pressing unit and the pressing unit contacts the processing target site. Including a contact point calculation step to calculate,
The contact point calculation step includes:
While pushing the pressing part toward the part to be processed using a second condition that is a second thrust for pushing the pressing part and includes a second thrust lower than the first thrust as a condition, Calculating the displacement ratio,
The manufacturing method which calculates the said contact point based on the time when the said displacement ratio under the said 2nd condition became below a 2nd threshold value.

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