JP2016196012A - Weld molding control method and weld molding control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weld molding control method and apparatus with manhour considerably reduced by automatically generating a welding path of a welding torch.SOLUTION: A weld molding control method and apparatus comprises steps of: deriving differential shape data of a differential shape (w12) between a pre-molding shape (w1) and a post-molding shape (w2) of an object workpiece (W) to arbitrarily set welding conditions of a welding torch (T) including impressed voltage value and current value, welding speed, and a weaving amount; deriving weld bead shape data of a weld bead shape of a weld bead (B) from the welding conditions to arbitrarily set overlap conditions of the weld bead (B); and automatically generating a welding path of the welding torch (T) for molding the post-molding shape (w2) by performing padding with the weld bead (B) formed under the welding conditions to fill the differential shape (w12) on the basis of the weld bead shape data, the differential shape data, and the overlap conditions.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a welding molding control method in which build-up welding is performed on a target workpiece with a weld bead.

  Regarding this type of welding molding method, there is an example disclosed in Patent Document 1 as a method of manufacturing a mold.

JP-A-1-162571

  The patent document 1 forms a welding layer made of a dissimilar metal by performing overlay welding on a die block which is a target work having an approximate shape obtained by subtracting a certain thickness from a required mold shape. The present invention relates to a mold manufacturing method in which a weld layer is cut to form a required mold portion.

  However, Patent Document 1 also includes a tool steel having a thickness of about 10 to 15 mm, which is overlaid by arc welding using a coated welding rod on the die block mold part and the parting surface 2 in the embodiment. Only the formation of the weld layer is described, and it is not disclosed how to form the weld layer by arc welding.

Since a weld bead is formed along the weld line by a welding path in which the welding torch is moved and arc-welded, conventionally, when overlay welding is performed using a welding torch by an automatic off-line system, the welding torch moving path, that is, welding is conventionally performed. All paths were pre-defined manually in CAD.
Therefore, it takes a lot of man-hours and a lot of labor and time.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a welding molding control method and apparatus in which a welding pass of a welding torch is automatically generated and man-hours are greatly reduced.

In order to achieve the above object, the invention according to claim 1
The difference shape data of the difference shape between the pre-molding shape and the post-molding shape of the target workpiece is derived from the pre-molding shape data and the post-molding shape data,
Set the welding voltage of the welding torch arbitrarily, including the applied voltage value / current value, welding speed, and weaving amount.
Deriving weld bead shape data of a weld bead shape of a weld bead formed along a weld line by the welding torch under the welding conditions from the welding conditions;
Set the welding bead overlap condition arbitrarily,
Welding pass of the welding torch for overlay welding with the weld bead formed under the welding conditions to fill the differential shape and forming the post-molding shape, the weld bead shape data and the differential shape data The welding molding control method is characterized in that it is automatically generated based on the overlap condition.

The invention according to claim 2
In the welding shaping control method according to claim 1,
The overlap condition corresponds to the ratio of the lateral overlap amount corresponding to the width direction of the weld bead to the bead width of the weld bead and the vertical direction of the weld bead relative to the bead height of the weld bead. The welding shaping control method according to claim 1, wherein the welding shaping control ratio is a ratio of a vertical overlap amount in a vertical direction.

The invention described in claim 3
In the welding shaping control method according to claim 2,
The differential shape data includes various differential shape data such as the shape of the weld surface of the target workpiece and the state of the weld surface such as the inclination and the thickness of the post-molding shape on the weld surface of the target workpiece,
Dividing the difference shape into a plurality of welding sites based on the state of the welding surface of the target workpiece,
Having as an attribute data differential shape data such as the thickness of the post-molding shape corresponding to each of the divided weld sites,
The welding sequence of each welding site is determined based on attribute data for each welding site, and a welding path of the welding torch is automatically generated.

The invention according to claim 4
In the welding shaping control method of Claim 2 or Claim 3,
The ratio of the lateral overlap amount corresponding to the width direction of the weld bead with respect to the bead width of the weld bead is 10 to 40%.

The invention according to claim 5
In the welding shaping control method according to any one of claims 1 to 4,
The weaving amount is 7 mm or less.

The invention described in claim 6
In the welding shaping control method according to any one of claims 1 to 5,
The target workpiece is a tire mold having the shape before molding.

The invention described in claim 7
In a welding molding control device for controlling the movement of a welding torch and overlay welding to a target workpiece with a welding bead,
Differential shape deriving means for deriving differential shape data of the differential shape between the pre-molding shape and the post-molding shape of the target workpiece based on the pre-molding shape data and the post-molding shape data of the target workpiece;
A weld bead shape for deriving weld bead shape data of a weld bead shape of the weld bead formed along the weld line by the welding torch based on the welding voltage of the welding torch, the applied voltage value, the current value, the welding speed, and the weaving amount. Deriving means;
Overlay welding with the weld bead formed under the welding condition based on the difference shape data derived by the difference shape deriving means, the weld bead shape data derived by the weld bead shape deriving means, and an overlap condition A welding path generating means for generating a welding path of the welding torch that fills the differential shape and forms the post-molding shape;
Welding torch movement control means for controlling movement of the welding torch according to the welding path generated by the welding path generation means and the welding conditions;
A welding molding control device comprising welding torch drive control means for driving and controlling the welding torch according to the welding conditions.

The invention described in claim 8
The welding molding control device according to claim 7,
The differential shape data derived by the differential shape deriving means includes various differential shapes such as the shape of the weld surface of the target workpiece and the state of the weld surface such as the inclination and the thickness of the post-molding shape on the weld surface of the target workpiece. There is data
The differential shape is divided into a plurality of weld sites based on the state of the weld surface of the target workpiece, and has differential shape data such as the thickness of the post-molding shape corresponding to each of the divided weld sites as attribute data. Differential shape dividing means for
The welding path generating means automatically generates a welding path of the welding torch by determining a welding order of each welding site based on attribute data for each welding site.

According to the welding shaping control method of claim 1, based on the difference shape data derived from the pre-molding shape data and the post-molding shape data, the weld bead shape data derived from the welding conditions, and the overlap condition, Since the welding path of the welding torch for forming the post-molding shape by overlay welding and filling the differential shape is automatically generated, man-hours can be greatly reduced, and labor and time can be reduced.
In addition, when looking at a weld line in which the weld bead is assumed to be one line, the interval between adjacent weld lines is determined from the weld bead shape data and the overlap condition, and then the number and position of the weld lines are determined based on the difference shape data. By determining the order of the welding pass, it is possible to automatically generate the welding pass of the welding torch.

  According to the welding shaping control method according to claim 2, the overlap condition includes a ratio of a lateral overlap amount corresponding to a width direction of the weld bead to a bead width of the weld bead and a bead height of the weld bead. This is the ratio of the vertical overlap amount in the vertical direction corresponding to the vertical direction of the weld bead, and therefore the interval between the adjacent weld lines in the vertical and horizontal directions is determined, making it easy to determine the position of the weld line and facilitate the welding pass of the welding torch Can be automatically generated.

  According to the welding shaping control method according to claim 3, there is various differential shape data such as the shape of the welding surface of the target workpiece and the state of the welding surface such as the inclination and the thickness of the shape after molding on the welding surface of the target workpiece, Since the difference shape is divided into a plurality of welding parts based on the state of the welding surface of the target workpiece, and the difference shape data such as the thickness of the post-molding shape corresponding to each divided welding part is given as attribute data, By automatically generating the welding path of the welding torch by deciding the welding order of each welding part that welds the welding part that approximated the attribute data continuously based on the attribute data for each welding part, it is efficient Can be welded.

  According to the welding shaping control method of claim 4, since the ratio of the lateral overlap amount to the bead width, that is, the lateral overlap ratio is 10 to 40%, the lateral overlap ratio is made less than 10%. Therefore, it is possible to avoid the formation of air, the uncontrollability of the build-up shape of the weld bead and the occurrence of welding defects due to the transverse overlap ratio exceeding 40%.

  According to the welding shaping control method of claim 5, since the weaving amount is set to 7 mm or less, when the weaving amount exceeds 7 mm, the concave portion of the meandering weld bead B becomes too deep, and air accumulates and weld defects. It is possible to avoid a situation in which it is easy to occur.

  According to the welding molding control method according to claim 6, the target workpiece is a tire mold having a shape before molding, and the tire mold whose shape has been changed due to wear or the like after being used for many years, Overlay welding with a weld bead can be used for molding and recycling, and cost reduction can be achieved.

  According to the welding molding control apparatus of claim 7, the welding path generation means is based on the difference shape data derived by the difference shape deriving means, the weld bead shape data derived by the weld bead shape deriving means, and the overlap condition. Overlay welding is performed with a weld bead formed under welding conditions to generate a welding pass of a welding torch that fills the differential shape and forms a post-molding shape, and the movement of the welding torch is controlled according to the welding pass and welding conditions, Since the welding torch itself is driven and controlled according to the welding conditions, the welding path of the welding torch is automatically generated, so that the number of steps can be greatly reduced, and labor and time can be reduced.

  According to the welding shaping control device according to claim 8, the differential shape is divided into a plurality of welding parts based on the state of the welding surface of the target workpiece, and the post-molding shape corresponding to each of the divided welding parts. Difference shape dividing means for providing difference shape data such as thickness as attribute data is provided, and the welding path generation means continuously welds the welded parts approximated by the attribute data based on the attribute data for each welded part. By automatically generating the welding path of the welding torch by determining the welding order of each welding site and automatically generating the welding path of the welding torch, it is possible to efficiently form a weld.

It is the schematic of the welding molding apparatus which concerns on one embodiment of this invention. It is a functional block diagram of a welding molding control apparatus. It is sectional drawing of an object workpiece. It is the figure which showed the welding bead typically. It is the figure which showed typically the overlap state of the horizontal direction and vertical direction of a weld bead. It is the figure which showed typically the build-up welding state by the difference shape which a difference shape data shows, and a weld bead.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
The welding molding apparatus 1 according to the present embodiment is an apparatus that regenerates a tire mold by welding molding, and has been used for many years as a target workpiece W having a shape before molding, and the shape has changed due to wear or the like. In this embodiment, an example is shown in which an annular mold that forms a side portion of a tire is used as a target work W.

Referring to FIG. 1, in welding molding apparatus 1, turntable 3 provided on turntable 2 rotates around a vertical rotation center axis by turntable 2, and an annular object is formed on turntable 3. The workpiece W is mounted with its center axis aligned with the rotation center axis of the turntable 3 and positioned and fixed by a jig.
An articulated welding robot 5 is disposed in the vicinity of the turntable 3.
A welding torch T is held by an arm at the tip of a welding robot 5 in which a plurality of arms are connected via a relatively rotatable joint.

  The welding torch T is an instrument that automatically feeds a welding wire into the supplied shield gas and performs arc welding with a welding current, and the welding torch T is held by an articulated welding robot 5. The welding torch T can be freely moved three-dimensionally by the welding robot 5 and can extend to the target work W on the turntable 3 to weld-mold a required portion with a weld bead.

The welding molding apparatus 1 includes a welding molding control apparatus 10.
The welding molding control device 10 performs data processing by a computer and outputs a control signal to each of the turntable 2, the welding robot 5, and the welding torch T, and drives them in cooperation with each other at the required location of the target workpiece W. Welding molding is performed.

FIG. 2 is a functional block diagram showing the functions of the welding molding control device 10 divided into blocks.
FIG. 3 shows a cross-sectional view of the target workpiece W that is an annular mold before molding.
The shape shown by the solid line in FIG. 3 is the pre-molding shape w1 of the target workpiece W, and the shape shown by the broken line is the post-molding shape w2.

The pre-molding shape data indicating the pre-molding shape w1 and the post-molding shape data indicating the post-molding shape w2 are input to the differential shape deriving means 11 of the welding molding control device 10 (see FIG. 2).
The differential shape deriving means 11 derives differential shape data indicating the differential shape w12 of the pre-molding shape w1 and the post-molding shape w2 from the pre-molding shape data and the post-molding shape data.
The differential shape data derived by the differential shape deriving means 11 is output to the welding path generating means 14.

Further, the welding bead shape deriving means 12 of the welding molding control device 10 is inputted with welding voltage values / current values of the welding torch T, the welding speed and the weaving amount.
A weld bead B is formed as a weld mark by continuous arc welding of the welding torch T. In this case, the filler material is built up by voltage and current applied to the welding torch T. When the welding speed is added to this, the shape of the weld bead B of the straight bead that is formed when the welding torch is linearly moved relative to the target workpiece is determined.

This straight bead weld bead B is relatively narrow for welding molding.
Therefore, in order to form the weld bead B wide, weaving is performed in which the welding torch is relatively moved while giving an amplitude orthogonal to the traveling direction.
Accordingly, in the weaving bead formed to be wide, the shape of the weld bead B is determined by the applied voltage value / current value, the welding speed, and the weaving amount.

FIG. 4 schematically shows the weld bead B formed by the welding torch T in this way.
The shape of weld bead B is indicated by bead width d and bead height h.

Therefore, the weld bead shape deriving means 12 derives the weld bead shape data of the bead width d and the bead height h of the weld bead B from the applied voltage value / current value, welding speed and weaving amount of the input welding conditions.
The weld bead shape data derived by the weld bead shape deriving means 12 is output to the weld path generating means 14.

On the other hand, the differential shape data derived from the pre-molding shape data and the post-molding shape data by the differential shape deriving unit 11 is also input to the differential shape dividing unit 13.
The differential shape data indicates the differential shape w12 between the pre-molding shape w1 and the post-molding shape w2. The shape of the weld surface of the target workpiece W, the state of the weld surface such as the inclination of the weld plane of the target workpiece W, and the target There are various differential shape data such as the thickness of the post-molding shape w2 on the welded surface of the workpiece W.

  The differential shape dividing means 13 first divides the differential shape w12 into a plurality of weld sites according to the state of the welding surface of the target workpiece W, the inclination, etc., and the thickness of the post-molding shape corresponding to each of the divided weld sites. Etc. are given as attribute data.

  For example, in the example of the target workpiece W shown in FIG. 3, a welded part P1 forming the outermost horizontal plane, a welded part P2 forming a vertical surface continuous to the welded part P1, and a welded part forming a horizontal curved surface continuous to the welded part P2. P3, a welded part P4 that forms an inclined surface continuous to the welded part P3, a welded part P5 that forms a horizontal plane that continues to the welded part P4, a welded part P6 that forms a vertical surface that continues to the welded part P5, and a welded part P6 that is continuous to the welded part P6 The welding part P7 is divided into the inner peripheral horizontal plane.

Then, each of the divided welding parts P1, P2, P3, P4, P5, P6, and P7 has differential shape data such as the thickness of the post-molding shape including the state of the corresponding welding surface as attribute data.
The attribute data of each of the welded parts P1, P2, P3, P4, P5, P6, and P7 divided by the differential shape dividing means 13 is output to the welding path generating means 14.

The attribute data of each welded part P1, P2, P3, P4, P5, P6, and P7 are similar to each other, and the welded parts that have similar attributes have the same welding path as the welding path. Since it can be set, it is possible to continuously perform the welding molding without changing the setting so much, and the molding can be performed efficiently.
The attribute data for each welding site P1, P2, P3, P4, P5, P6, P7 divided by the differential shape dividing means 13 is output to the welding path generating means 14.

  The welding path generation means 14 receives the difference shape data from the difference shape derivation means 11, the weld bead shape data from the weld bead shape derivation means 12, and the attribute data for each welded part from the difference shape classification means 13 respectively. The overlap condition is input.

As shown schematically in FIG. 5, the lateral transverse direction overlap amount Ld corresponding to the width direction of the weld bead B are formed to be shifted in this direction transverse to the weld bead B ₁ previously formed that the weld bead B ₂ are overlapped length in the horizontal direction of the portion that overlaps a portion (see FIG. 5 (1)), longitudinally overlapping amount Lh in the vertical direction corresponding to the vertical direction of the weld bead B is formed earlier This is the vertical overlap length of the portion where the weld bead B ₂ formed by shifting this time in the vertical direction with respect to the weld bead B ₁ is partially overlapped (see FIG. 5 (2)).

  The overlap condition input to the welding pass generation means 14 is the ratio of the lateral overlap amount Ld to the bead width d of the weld bead B (lateral overlap ratio Ld / d) and the bead height h of the weld bead B. It is set by the ratio of the vertical overlap amount Lh (vertical overlap ratio Lh / h).

The overlap conditions (horizontal overlap ratio Ld / d, vertical overlap ratio Lh / h) and the welding conditions (applied voltage value / current value of welding torch T, welding speed, weaving amount) are arbitrarily set. can do.
Therefore, the weld bead shape data (bead width d, bead height h) derived by the weld bead shape deriving means 12 from the welding conditions is arbitrarily set, and the set weld bead shape (bead width d, bead width d, By applying (multiplying) the overlap condition (horizontal overlap ratio Ld / d, vertical overlap ratio Lh / h) to the bead height h), the horizontal overlap amount Ld and the vertical overlap amount Lh are obtained. Can be calculated.

When the weld line α assuming that the weld bead B is a single line is set as the center axis of the weld bead B, referring to FIG. 5 (1), the bead width d and the lateral overlap amount Ld are exceeded in the lateral direction. The lateral interval between the weld lines α and α of the wrapping weld beads B ₁ and B ₂ is calculated as d−Ld.
Similarly, referring to FIG. 5 (2), the vertical interval between the weld lines α and α of the weld beads B ₁ and B ₂ that overlap in the vertical direction from the bead height h and the vertical overlap amount Lh is , H−Lh.

The welding pass generation means 14 inputs the weld bead shape data derived by the weld bead shape deriving means 12 and the overlap condition, and the transverse direction between the weld lines α and α of the weld beads B and B that overlap by the above calculation. The interval d-Ld and the vertical interval h-Lh are calculated.
Then, the differential shape data derived by the differential shape deriving unit 11 from the pre-molding shape data and the post-molding shape data is input to the welding path generating unit 14.

An example of the difference shape w12 indicated by the difference shape data derived by the difference shape deriving means 11 is schematically shown by a two-dot chain line in FIG.
The welding path generating means 14 generates a welding path that is a welding path by the welding torch T that forms the post-molding shape by overlay welding the differential shape w12 with the weld bead B.
The welding path is a welding path by the welding torch T, and the welding line α can indicate the position of the welding path.

  Referring to FIG. 6, the number of welding paths in the horizontal direction is determined from the width (difference shape data) of the welded portion indicated by differential shape w12 and the lateral distance d-Ld between weld lines α and α. The number (number of layers) of welding paths in the vertical direction is determined from the height (difference shape data) and the vertical interval h-Lh between the welding lines α and α.

  Therefore, the welding path generation means 14 can set the first welding path (welding line α11) at the end portion in contact with the welding surface of the welding portion based on the difference shape w12 and the weld bead shape. When the welding path (welding line α11) is set, a second welding path (welding line α12) that overlaps in the lateral direction and is shifted by the lateral distance d−Ld is automatically generated, and the second welding is performed. The third and subsequent welding passes (welding lines α13, α14,...) Are automatically and sequentially generated in the horizontal direction of the pass (welding line α12), and the first number of welding passes are generated by generating the determined number. Is generated.

  Next, the first welding pass (welding line α11) of the first layer is shifted by the longitudinal interval h−Lh, and the first welding pass (welding of the second layer) based on the difference shape w12 and the weld bead shape. Line α21) can be set, and when the first welding pass (welding line α11) of the first layer is set, the horizontal direction overlaps and shifts by the horizontal interval d−Ld, and the vertical direction A second welding path (welding line α12) shifted by the interval h−Lh is generated, and then a second layer welding path (welding lines α22, α23,...) Is sequentially generated in the horizontal direction. The third layer welding pass (welding lines α31, α32,...) Is also generated.

As described above, the welding pass generation means 14 is configured to determine the horizontal interval d-Ld and the vertical interval h-Lh between the weld lines α, α of the weld beads B, B that overlap from the weld bead shape data and the overlap condition. , And a welding pass can be automatically generated based on the horizontal interval d-Ld and the vertical interval h-Lh between the weld lines α and α, the difference shape data, and the weld bead shape data.
Note that the welding path generating means 14 automatically generates a welding path for each of the welded parts P1, P2, P3, P4, P5, P6, and P7 of the target workpiece W.

Attribute data for each welded part P1, P2, P3, P4, P5, P6, P7 divided by the differential shape dividing means 13 is input to the welding path generating means 14, and the welding path generating means 14 A welding pass is automatically generated for each of the parts P1, P2, P3, P4, P5, P6, and P7.
Then, the welding path generating means 14 determines the order in which welding parts P1, P2, P3, P4, P5, P6, and P7 are weld-molded from the attribute data, with the welding parts having similar attributes as serial numbers.

  For example, a welded part P7 whose welding surface is horizontal and the thickness of the differential shape w12 is approximately the same as the welded part P1 is approximate, and a welding part P5 whose welding surface is horizontal and the differential shape w12 is thin is approximated next. The welding part P3 where the welding surface forms a horizontal curved surface is approximated next, the welding part P4 where the welding surface is an inclined surface is approximated next, and the welding parts P2 and P6 where the welding surface is a vertical surface are next. If approximate, the welding molding order is the order of the welded parts P1, P7, P5, P3, P4, P2, and P6.

Welding parts with similar attributes can be set in the same way as the welding path that is the welding path, so it is possible to perform continuous welding molding without changing the setting much, and to efficiently mold Can do.
In this way, the welding path generation means 14 can automatically generate a welding path including the order of the welding parts of the target workpiece W.

The welding molding control device 10 includes a welding torch movement control means 15 for controlling the turntable 2 and the welding robot 5. The welding path data generated by the welding path generation means 14 is input to the welding torch movement control means 15. The
The welding speed and the weaving amount of the welding conditions are separately input to the welding torch movement control means 15.

  The welding torch movement control means 15 inputs the welding pass data, the welding speed and the weaving amount, processes the data, outputs a turntable control signal based on the welding speed to the turntable 2 and outputs the turntable 3 of the tire mounted on the turntable 3. The target workpiece W, which is an annular mold forming the side portion, is rotationally controlled, and a robot control signal based on the welding path data and the weaving amount is output to the welding robot 5 to drive the articulated welding robot 5 to thereby perform a welding torch. T is controlled to move.

Further, the welding molding control device 10 is provided with a welding torch drive control means 16 for controlling a welding torch T that is movably supported by the welding robot 5, and the welding torch drive control means 16 includes a welding torch among welding conditions. The applied voltage value / current value of T is input.
The welding torch drive control means 16 drives and controls the welding torch T by applying a voltage / current to the welding torch T according to the input applied voltage value / current value.

  The welding torch movement control means 15 and the welding torch drive control means 16 of the welding molding control device 10 cooperate with each other to control the turntable 2, the welding robot 5, and the welding torch T, and according to the automatically generated welding path. We will sequentially weld the required parts of W.

  When the target workpiece W, which is an annular mold having a cross-sectional shape shown in FIG. 3, is formed according to the welding molding order (welding sites P1, P7, P5, P3, P4, P2, P6) determined as described above. First, welding molding is started according to the welding path generated for the welded part P1 from the outermost welded part P1.

  That is, the welding robot 5 is driven to position the welding torch T at the start position of the first welding pass of the welded part P1, and simultaneously the driving torch T is driven to drive the turntable 2 to control the rotation of the target workpiece W. At the same time, the welding torch T is vibrated by the welding robot 5 so that the welding bead B by weaving is formed by overlay welding along the first welding path (welding line α).

When the target workpiece W makes one turn, the weld bead B is welded in the same manner along the second welding pass (welding line α), and thereafter the meat is sequentially welded along the number of welding passes determined for the welding portion P1. Saddle welding is performed, and the post-molding shape of the welded part P1 is molded.
Next, the welding robot 5 is driven to move the welding torch T to the start position of the first welding pass of the welded part P7, and build-up welding of the weld bead B is started, in the same manner as at the welded part P1. The post-molding shape of the weld site P2 is molded.

The welded part P1 and the welded part P7 are similar to each other in the attribute data, and the welding path that is the welding path can be set in the same way, so that it is possible to continuously perform welding molding without changing the setting much. It is possible and can be molded efficiently.
In this way, the remaining welded parts P5, P3, P4, P2, and P6 are welded in this order, and the post-molding shape of the entire target workpiece W is molded.

On the other hand, it is found that when overlay welding is performed in a circumferential direction on an annular workpiece such as an annular mold, distortion is suppressed by overlay welding from the outer diameter side to the inner diameter side. Therefore, if it is not necessary to change the setting every time the welding part is switched, it is better to form by welding in the order of the welding parts P1, P2, P3, P4, P5, P6 and P7.
In the case where welding is not performed in the circumferential direction, it is efficient to mold in the order of close attributes as described above.

  Note that one weld pass is not necessarily generated on the entire circumference of the target workpiece W. Therefore, the weld bead B is overlaid by the welding torch T as the target workpiece W rotates. In some cases, the driving of the welding torch T is stopped at a predetermined timing, and the weld bead B is partially formed only at a required portion.

In addition, the post-molding shape of the target workpiece W formed by welding molding is approximately the same as the post-molding shape input as the initial post-molding shape data, but does not match the details, but the post-molding shape of the post-molding shape data Is included.
The target workpiece W that has been welded is subjected to finish processing and regenerated as a tire mold having a required shape.

  As described above, the welding molding control device 10 of the welding molding apparatus 1 is based on the differential shape data derived from the pre-molding shape data and the post-molding shape data, the weld bead shape data derived from the welding conditions, and the overlap condition. Since the welding pass of the welding torch T which builds up the welded shape with the weld bead B and fills the differential shape to form the post-molding shape is automatically generated, man-hours can be greatly reduced, and labor and time can be reduced.

Although welding conditions can be arbitrarily input and the weld bead shape can be arbitrarily set, the weaving amount is suitably 7 mm or less.
If the weaving amount exceeds 7 mm, the concave portion of the meandering weld bead B becomes too deep and air is easily accumulated, so that welding defects are likely to occur. However, if the weaving amount is 7 mm or less, the welding defects can be reduced.

In addition, the overlap condition can be arbitrarily set, but a suitable overlap ratio in the horizontal direction is 10 to 40%.
If the overlap ratio in the horizontal direction is less than 10%, air may be formed between the overlapping weld beads B and B. If the overlap ratio in the horizontal direction exceeds 40%, the amount of overlap will be large. It becomes difficult to control the build-up shape of the bead, and welding defects are likely to occur.

  In the present embodiment, the tire mold is the target work, but various things other than the tire mold can be applied as the target work.

W: target workpiece, w1: pre-molding shape, w2: post-molding shape, w12: differential shape, P1, P2, P3, P4, P5, P6, P7 ... welding site, T ... welding torch, B ... welding bead, α ... welding lines,
DESCRIPTION OF SYMBOLS 1 ... Welding molding apparatus, 2 ... Turntable, 3 ... Turntable, 5 ... Welding robot,
DESCRIPTION OF SYMBOLS 10 ... Welding molding control apparatus, 11 ... Difference shape derivation means, 12 ... Weld bead shape derivation means, 13 ... Difference shape division means, 14 ... Weld path generation means, 15 ... Welding torch movement control means, 16 ... Welding torch drive control means.

Claims (8)

The difference shape data of the difference shape between the pre-molding shape and the post-molding shape of the target workpiece is derived from the pre-molding shape data and the post-molding shape data,
Set the welding voltage of the welding torch arbitrarily, including the applied voltage value / current value, welding speed, and weaving amount.
Deriving weld bead shape data of a weld bead shape of a weld bead formed along a weld line by the welding torch under the welding conditions from the welding conditions;
Set the welding bead overlap condition arbitrarily,
Welding pass of the welding torch for overlay welding with the weld bead formed under the welding conditions to fill the differential shape and forming the post-molding shape, the weld bead shape data and the differential shape data A welding molding control method, which is automatically generated based on the overlap condition.   The overlap condition corresponds to the ratio of the lateral overlap amount corresponding to the width direction of the weld bead to the bead width of the weld bead and the vertical direction of the weld bead relative to the bead height of the weld bead. The welding shaping control method according to claim 1, wherein the welding shaping control ratio is a ratio of a vertical overlap amount in a vertical direction. The differential shape data includes various differential shape data such as the shape of the weld surface of the target workpiece and the state of the weld surface such as the inclination and the thickness of the post-molding shape on the weld surface of the target workpiece,
Dividing the difference shape into a plurality of welding sites based on the state of the welding surface of the target workpiece,
Having as an attribute data differential shape data such as the thickness of the post-molding shape corresponding to each of the divided weld sites,
The welding shaping control method according to claim 2, wherein a welding order of each welding part is determined based on attribute data for each welding part, and a welding path of the welding torch is automatically generated.   The weld molding according to claim 2 or 3, wherein a ratio of a lateral overlap amount corresponding to a width direction of the weld bead to a bead width of the weld bead is set to 10 to 40%. Control method.   The welding shaping control method according to any one of claims 1 to 4, wherein the weaving amount is 7 mm or less.   6. The welding molding control method according to claim 1, wherein the object workpiece is a tire mold having the shape before molding. In a welding molding control device for controlling the movement of a welding torch and overlay welding to a target workpiece with a welding bead,
Differential shape deriving means for deriving differential shape data of the differential shape between the pre-molding shape and the post-molding shape of the target workpiece based on the pre-molding shape data and the post-molding shape data of the target workpiece;
A weld bead shape for deriving weld bead shape data of a weld bead shape of the weld bead formed along the weld line by the welding torch based on the welding voltage of the welding torch, the applied voltage value, the current value, the welding speed, and the weaving amount. Deriving means;
Overlay welding with the weld bead formed under the welding condition based on the difference shape data derived by the difference shape deriving means, the weld bead shape data derived by the weld bead shape deriving means, and an overlap condition A welding path generating means for generating a welding path of the welding torch that fills the differential shape and forms the post-molding shape;
Welding torch movement control means for controlling movement of the welding torch according to the welding path generated by the welding path generation means and the welding conditions;
A welding molding control device comprising welding torch drive control means for driving and controlling the welding torch according to the welding conditions. The differential shape data derived by the differential shape deriving means includes various differential shapes such as the shape of the weld surface of the target workpiece and the state of the weld surface such as the inclination and the thickness of the post-molding shape on the weld surface of the target workpiece. There is data
The differential shape is divided into a plurality of weld sites based on the state of the weld surface of the target workpiece, and has differential shape data such as the thickness of the post-molding shape corresponding to each of the divided weld sites as attribute data. Differential shape dividing means for
8. The welding molding according to claim 7, wherein the welding path generating means automatically generates a welding path of the welding torch by determining a welding order of each welding site based on attribute data for each welding site. Control device.

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