JP5199823B2 - Laser overlaying apparatus and laser overlaying method for forming valve seat - Google Patents

Description

  The present invention relates to a valve seat forming laser for forming a build-up portion by supplying a metal powder to a plurality of valve seat portions arranged in a cylinder head and solidifying the metal powder after irradiating and melting the laser light. The present invention relates to an overlay apparatus and a laser overlay method.

  A cylinder head support and a cylinder head that support the formation surface of each of the plurality of valve seat portions arranged in a straight line on the cylinder head by laser overlay processing so as to be substantially horizontal should be formed. A cylinder head support base around the axis of the valve seat part, a support part provided with a rotation drive mechanism that rotates during laser overlay processing, and a connecting part that can be engaged with and disengaged from the cylinder head support base. The cylinder head is connected to the cylinder head support base with the cylinder head support base aligned with the cylinder head support base in the arrangement direction of the valve seat part, and the rotational axis of the rotary drive mechanism is aligned with the axis of the valve seat part to be formed A valve seat forming laser build-up device having a positioning part that moves and positions so as to slide is known. And it has (see Patent Document 1).

Conventionally, in order to improve and stabilize the material quality of the valve seat portion to be formed, that is, the base material of the cylinder head of the build-up portion and the structure formed in the build-up portion, the entire cylinder head is kept at room temperature. In order to obtain a high and constant temperature, preheating at a constant temperature is performed.
Japanese Patent No. 3641904

  In the above-described conventional technology, the cylinder head may be thermally deformed due to the build-up processing with a relatively high temperature laser beam, and the position of the valve seat portion may be displaced. Therefore, the laser build-up processing in which the cylinder head is slid and moved and positioned may be processing with low positional accuracy with respect to the position of the valve seat portion.

  Therefore, in order to eliminate the influence of the thermal deformation of the cylinder head, before the laser build-up processing of the cylinder head, the build-up portion and the cylinder which are affected by the heat of the laser light by setting the entire cylinder head to a constant temperature higher than room temperature. In order to reduce the temperature difference from the temperature of the entire head, preheat at a certain temperature for the purpose of improving and stabilizing the quality of the position accuracy, which also improves and stabilizes the material quality. It is conceivable to predict the position of the valve seat part of the deformed cylinder head.

  However, when the preheating temperature varies, it is difficult to predict the position of the valve seat portion of the cylinder head that is thermally deformed. In addition, the preheating applied to the cylinder head increases the accuracy of predicting the position of the valve seat portion of the thermally deformed cylinder head by making the entire cylinder head at a uniform temperature. Has the problem of taking time.

  It is an object of the present invention to provide a valve seat forming laser build-up device and a laser build-up method that can improve the position accuracy of laser build-up processing with respect to a valve seat portion of a cylinder head.

The laser build-up device for forming a valve seat according to the present invention is formed by supplying metal powder to a plurality of valve seat portions arranged in a cylinder head, irradiating the metal powder with laser light, and melting and solidifying the metal powder. A laser seating device for forming a valve seat for forming a part,
Support means for supporting the cylinder head;
Positioning means for positioning the cylinder head based on a positioning pin provided in the support means and inserted into a guide hole of a valve stem corresponding to a valve seat portion in which the build-up portion of the cylinder head is formed;
A rotating means for rotating the cylinder head positioned by the positioning means around an axis of a guide hole of the valve stem;
Metal powder supply means for supplying metal powder to the valve seat portion positioned by the positioning means;
Laser light irradiation means for irradiating the metal powder supplied by the metal powder supply means with laser light to form a ring-shaped buildup portion on the valve seat portion rotated by the rotation means;
Inserting a positioning pin of the positioning means provided in the support means into a guide hole of the valve stem corresponding to the valve seat part of the cylinder head in which the build-up part is formed by the laser light irradiation means, The cylinder head in which the build-up portion is formed by the laser light irradiation means is extracted from the positioning pin of the positioning means provided in the support means, and then the build-up portion is formed by the laser light irradiation means. as the positioning pins of the positioning means provided on said support means in the guide hole of the valve stem which corresponds to the valve seat of the cylinder head is inserted, moved apart the cylinder head from said support means And a transfer robot.

According to the present invention, the guide of the valve stem corresponding to the valve seat portion of the cylinder head in which the positioning portion of the positioning means provided on the support means is formed by the laser beam irradiation means by the transfer robot. A cylinder head that is inserted into the hole and the cylinder head on which the build-up portion is formed by the laser light irradiation means is extracted from the positioning pin of the positioning means provided on the support means, and then the cylinder portion on which the build-up portion is formed by the laser light irradiation means as the positioning pins of the positioning means provided on the supporting means into the guide hole of the valve stem which corresponds to the valve seat portion of the head is inserted, it is moved apart the cylinder head from the support means. For this reason, the cylinder head inserted into the support means is heated by the laser light irradiation means to form a built-up portion, and the cylinder head on which the build-up portion is formed by the laser light irradiation means is extracted from the support means. In addition, since the cylinder head is moved away from the support means in order to form the built-up portion in the valve seat portion by the laser beam irradiation means, the cylinder head is cooled and the influence of thermal deformation of the cylinder head can be reduced. it can.
In addition, the cylinder head positioned by the transfer robot with the positioning pin of the positioning means provided in the support means is the axis of the guide hole of the valve stem corresponding to the valve seat part where the build-up part of the cylinder head is formed The metal powder supplied by the metal powder supply means is irradiated with a laser beam so as to form a ring-shaped overlay on the valve seat portion. Therefore, by repeating the insertion of the cylinder head into the support means and the extraction of the cylinder head from the support means by the transfer robot, it is possible to improve the position accuracy of the laser build-up processing with respect to the valve seat portion of the cylinder head. .

According to the laser beam forming method for forming a valve seat of the present invention, the metal powder is supplied to a plurality of valve seat portions arranged in a cylinder head, and the metal powder is irradiated with laser light to be melted and then solidified. A laser seating method for forming a valve seat for forming a portion,
The cylinder on the basis of a positioning pin provided in the guide hole of the valve stem corresponding to the valve seat portion corresponding to the valve seat portion on which the support portion for supporting the cylinder head and the build-up portion of the cylinder head is formed. positioning means for positioning the head, and provided with a transfer robot for moving the cylinder head, the positioning pins of the positioning means provided on said support means by the transfer robot, the padding portion is formed the An insertion step of inserting into a guide hole of the valve stem corresponding to the valve seat portion of the cylinder head;
Supplies metal powder to the valve seat portion of the cylinder head the positioning pins are inserted in said positioning means provided on said support means by said insertion step, the valve is irradiated with a laser beam to the metal powder And a laser beam irradiation step of forming a build-up portion on the sheet portion.

According to the present invention, the cylinder head is inserted into the support means for positioning by the transfer robot with reference to the guide hole of the valve stem corresponding to the valve seat portion. And while supplying metal powder to the valve seat part of the inserted cylinder head, this metal powder is irradiated with a laser beam, and a built-up part is formed in a valve seat part. Therefore, by inserting the cylinder head to the support means by the transfer robot, it is possible to improve the positional accuracy of the laser padding processing relative to the valve seat of the cylinder head.

In the laser beam forming method for forming a valve seat according to the present invention, in the laser beam irradiation step, the cylinder head into which the positioning pin of the positioning unit provided in the support unit is inserted in the valve step is inserted into the valve. It is preferable to simultaneously perform the rotation step of rotating around the axis of the guide hole of the stem.

  According to this preferred embodiment, in the laser light irradiation step, the cylinder head inserted into the support means is simultaneously rotated around the axis of the guide hole of the valve stem, so that a ring-shaped build-up portion is formed on the valve seat portion. In addition, it is possible to improve the position accuracy of the laser overlay processing with respect to the valve seat portion of the cylinder head.

The valve seat forming laser padding method of the present invention, the transfer robot, the cylinder head padding is formed by the irradiation of the laser beam, positioning of the positioning means provided on said support means and extraction step of extracting from the pin, the transfer robot, then provided on the supporting means in the guide hole of the valve stem which corresponds to the valve seat portion of the cylinder head padding is formed by the irradiation of the laser beam as the positioning pins of the positioning means is inserted which is preferably comprises a moving step of moving apart said cylinder head from said support means.

  According to this preferred embodiment, the cylinder head in which the build-up portion is formed by the laser light irradiation means is extracted from the support means, and then the cylinder head is used to form the build-up portion in the valve seat portion by the laser light irradiation means. Is moved away from the support means. For this reason, a cylinder head is cooled and the influence of the thermal deformation of a cylinder head can be made small. Therefore, by repeating the insertion of the cylinder head into the support means and the extraction of the cylinder head from the support means by the transfer robot, it is possible to improve the position accuracy of the laser build-up processing with respect to the cylinder head portion.

  FIG. 1 is a perspective view showing a cylinder head applied to the present invention. The cylinder head 10 is formed in a rectangular parallelepiped shape. The cylinder head 10 is formed with cylinder head recesses 12 corresponding to a plurality of cylinders. One port 14 and the other port 15 for supplying air to the cylinder or exhausting from the cylinder are formed in the cylinder head recess 12. Further, the cylinder head 10 is formed with a manifold 16 communicating with one port 14 or the other port 15 through a passage for supplying air to the cylinder or exhausting it from the cylinder. On the inner peripheral surface of one port 14 and the other port 15, a valve seat portion 18 with which the valve abuts is formed.

  The cylinder head 10 is fixed to the pallet 20 with four clamp arms 21. The pallet 20 has two pairs of reference surfaces 22, 24 at the lower end and this horizontal reference surface 26 at the upper end. The cylinder head 10 is fixed to a reference surface 26 that is horizontal to the upper end of the pallet 20. Two pairs of reference surfaces 22, 24 are formed at the lower end of the pallet 20, and a pair of reference surfaces 22 is formed on the lower surfaces of the two legs 22 a, 22 b on the left side of the pallet 20, and another pair of reference surfaces 24 is formed. The right side of the pallet 20 is formed on the lower surface of the two legs 24a, 24b.

  2 and 6 are views for explaining a valve seat forming cylinder head support device which is a constituent element of the valve seat forming laser build-up device of the present invention. The valve seat forming cylinder head support device 30 is generally composed of a pallet 20, a positioning mechanism 32, a cylinder head rotating mechanism 34, a tilt mechanism 35, and a support base 42. A configuration that does not include the pallet 20 is simply referred to as a support device 30.

  The positioning mechanism 32 includes a cylinder 36 and a positioning pin 38. The positioning pin 38 is inserted so as to fit in the guide hole 40 of the valve stem corresponding to the valve seat portion 18 of the cylinder head 10 to be laser-embedded, which will be described later, and positions the cylinder head 10. The positioning pin 38 of the positioning mechanism 32 is configured to be advanced and retracted by the cylinder 36.

  The aforementioned valve for taking in or out of the cylinder is a reference in the radial direction about this axis. The valve stem extending to the axis supports the valve by slidingly contacting a guide hole 40 of the valve stem provided in the cylinder head. The valve contacts the valve seat when the valve is open while the valve stem slides and the valve opens and closes. The valve seat portion has a target shape along the axis of the guide hole 40 of the valve stem.

  In the pallet 20, a pair of reference surfaces 22 provided at the lower end or another pair of reference surfaces 24 are supported by a support base 42 and fixed by a clamper 44 provided on the support base 42.

  The support base 42 supports the cylinder head 10, the pallet 20, the positioning mechanism 32, the cylinder head rotating mechanism 34, and the tilt mechanism 35. The positioning mechanism 32 is supported by the support base 42 by fixing the cylinder 36 to the support base 42. The cylinder head rotating mechanism 34 includes, for example, a mechanism in which a worm wheel fixed to a rotating table of a support base 42 coaxial with the positioning mechanism 32 is rotated by a worm fixed to the support base 42 and connected to a drive source. Composed. The tilt mechanism 35 is a mechanism that rotates the support base 42 in the left-right direction.

  A heating unit 46 for heating the cylinder head 10 via the pallet 20 is provided between the pallet 20 and the support base 42. The temperature of the heating unit 46 is controlled so as to maintain the cylinder head 10 at a predetermined temperature based on, for example, the temperature in the vicinity of the valve seat unit 18 measured by the temperature measuring unit.

  FIG. 3 is a view showing a laser beam irradiation device and a metal powder supply device, which are components of the laser beam building apparatus for forming a valve seat according to the present invention. The laser beam irradiation device 52 performs laser overlay processing. The laser build-up processing is performed by irradiating the metal powder with laser light while supplying the metal powder by the metal powder supply device 54 and the argon gas by the argon gas supply device to the valve seat portion 18 rotated by the cylinder head rotating mechanism 34. A ring-shaped build-up part is formed.

  In the laser build-up process, the metal powder is melted and then solidified to form a build-up portion. Accordingly, in laser build-up processing, gas is supplied to the valve seat portion 18 via the manifold 16 of the cylinder head 10 or the valve seat portion via the manifold 16 so as to cool the molten metal powder. The air in the vicinity of 18 is sucked.

  Examples of the metal powder include copper alloy metal powder excellent in heat resistance and wear resistance. After the build-up layer is formed, a smooth valve seat surface is formed by machining.

  FIG. 3 shows a driving source that drives the support device 30, the laser beam irradiation device 52, and the metal powder supply device 54. The support device 30 is driven by the first drive source 55 in the X-axis direction (oblique vertical direction in the drawing). The support device 30 is driven by the second drive source 56 in the Y-axis direction (diagonal left and right direction in the drawing). Further, the support device 30 is rotationally driven by the third drive source 57 around the C axis (oblique vertical direction in the figure). The support device 30 is rotationally driven by a drive source around the B axis (around the positioning pin 38). The laser light irradiation device 52 and the metal powder supply device 54 are driven by a fourth drive source 58 in the Z-axis direction (vertical direction in the drawing).

  FIG. 4 is a view showing a laser build-up device for forming a valve seat according to the present invention. The valve seat forming laser build-up device 60 is generally composed of a pallet 20, a support device 30, a cylinder head rotating mechanism 34, a support base 42, a laser beam irradiation device 52, a metal powder supply device 54, and a transfer robot 62. Yes.

  The transfer robot 62 grips the cylinder head 10 conveyed from the previous process by the robot hand 64 of the transfer robot 62 as shown in FIG. 10, and fixes it to the pallet 20 as shown in FIG. Further, the transfer robot 62 holds the cylinder head 10 fixed to the pallet 20 by the robot hand 64 of the transfer robot 62 and positions it on the support device 30 so as to be positioned by the positioning mechanism 32 as shown in FIG. insert.

  FIG. 5 is a flowchart showing the laser beam building method for forming a valve seat according to the present invention.

  First, the transfer robot 62 holds the cylinder head 10 mounted on the transfer unit transferred from the previous process by the robot hand 64 of the transfer robot 62 and fixes it to the pallet 20 (ST100).

  Next, the cylinder head 10 fixed to the pallet 20 is gripped by the robot hand 64 of the transfer robot 62 by the transfer robot 62, and the valve head portion of the one port 14 or the other port 15 that performs laser overlay processing. 18 is inserted into the support device 30 so as to be positioned by the positioning mechanism 32 (ST101).

  Then, the temperature at which the cylinder head 10 is heated via the pallet 20 is measured by the heating unit 46 provided between the pallet 20 and the support base 42 (ST102). The temperature of the heating unit 46 is measured by, for example, a temperature measuring device that measures the surface temperature of the cylinder head 10 mounted on the robot 66 disposed in the vicinity of the support device 30 in a non-contact manner. Controlled to maintain.

  Thereafter, it is determined whether or not the temperature of the cylinder head 10 heated by the heating unit 46 is a predetermined temperature (ST103). If the determination result in ST103 is NO, the process waits until the temperature of the cylinder head 10 reaches a predetermined temperature.

  If the determination result in ST103 is YES, the cylinder head 10 fixed to the pallet 20 and inserted into the support device 30 is moved together with the support device 30 in the + direction on the X axis shown in FIG. Then, laser build-up processing is performed by the laser beam irradiation device 52 (ST104).

  Next, the cylinder head 10 fixed to the pallet 20 and inserted into the support device 30 is moved together with the support device 30 in the negative direction on the X axis shown in FIG. The residual metal powder is removed by laser overlay processing (ST105). For example, the metal powder remaining after the laser overlaying process is removed by a powder suction device mounted on the robot 66 disposed in the vicinity of the support device 30.

  Then, it is determined whether or not the number (n) of the one port 14 and the other port 15 of the cylinder head 10 is the same as the number (m) of execution of the processes from ST101 to ST105 (ST106).

  When the determination result of ST106 is NO, the cylinder 10 fixed to the pallet 20 is extracted from the support device 30 by the transfer robot 62, and the next port 15 or the other port 15 where the laser build-up processing is performed next. The cylinder 10 fixed to the pallet 20 is moved by the transfer robot 62 so that the valve head unit 18 is positioned by the positioning mechanism 32 (ST107). Thereafter, the process returns to ST101.

  On the other hand, when the determination result in ST106 is YES, the cylinder head 10 fixed to the pallet 20 is released from being fixed to the pallet 20, the cylinder 10 is gripped by the robot hand 64 of the transfer robot 62, and the cylinder head 10 is moved to the next. The paper is discharged to a transport section that transports to the process (ST108).

  Next, the operation of the valve seat forming cylinder head support device 30 which is a component of the valve seat forming laser build-up device of the present invention will be described.

  FIG. 6 is a view for explaining the operation of the valve seat forming cylinder head support device.

  First, as shown in FIG. 6B, the transfer stem 62 of the valve stem corresponding to the valve seat portion 18 of the one port 14 on which the cylinder head 10 fixed to the pallet 20 is laser-embedded is processed. A vertical positioning pin 38 is inserted into the guide hole 40. Thereby, the cylinder head 10 fixed to the pallet 20 is inserted into the support device 30.

  Next, as shown in FIG. 6A, the tilt mechanism 35 of the support device 30 is driven by the third drive source 57 shown in FIG. 3 and tilted to the left, and the work surface of the valve seat portion 18 is substantially the same. The support device 30 is set to approximately 45 ° so as to be horizontal. Then, the cylinder head rotating mechanism 34 of the support device 30 is rotated around the axis of the positioning pin 38 to perform laser overlay processing. Thereafter, the cylinder head 10 is returned again as shown in FIG. 6B, and further, as shown in FIG. 6C, the cylinder head 10 is removed from the positioning pin 38 by the transfer robot 62 and fixed to the pallet 20. 10 is moved above the positioning pin 38.

  Then, as shown in FIG. 6 (d), the transfer robot 62 corresponds to the valve seat portion 18 of the other port 15 paired with the one port 14 that has been laser-embedded in FIG. 6 (a). The pallet 20 to which the cylinder head is fixed is rotated so that the guide hole 40 of the valve stem is directly below the positioning pin 38 of the support device 30.

  Thereafter, as shown in FIG. 6E, the transfer robot 62 inserts the positioning pin 38 into the guide hole 40 of the valve stem corresponding to the valve seat portion 18 of the other port 15 in FIG. 6D. The cylinder head 10 is positioned.

  Then, in order to perform laser overlay processing on the processing surface of the valve seat portion 18 of the other port 15 in FIG. 6 (d) in the same positional relationship as the overlay processing in FIG. 6 (a), FIG. As shown in (f), the cylinder head rotating mechanism 34 of the support device 30 is rotated around the axis of the positioning pin 38. Thereafter, as shown in FIG. 6G, the tilt mechanism 35 of the support device 30 is driven by the third drive source 57 shown in FIG. The support device 30 is set to approximately 45 ° so that the work surface of the portion 18 is substantially horizontal. Then, the cylinder head rotating mechanism 34 of the support device 30 is rotated around the axis of the positioning pin 38 to perform laser overlay processing.

  Thereafter, the cylinder head 10 is returned again as shown in FIG. 6 (f), and the cylinder head 10 is extracted from the positioning pin 38 in the same manner as in FIG. 6 (c). Thereby, the cylinder head 10 fixed to the pallet 20 is extracted from the support device 30.

  6 (a) and 6 (g), the guide hole 40 of the bubble stem corresponding to the bubble sheet portion 18 in which the build-up portion of the cylinder head 10 is to be formed is positioned by the positioning means. The positioning pins 38 are used for direct support. By the way, when the cylinder head 10 is warmed, the position of the valve seat portion 18 from the end portion in the longitudinal direction of the cylinder head 10 may be greatly displaced. According to the build-up processing with a relatively high temperature laser beam, thermal expansion occurs in the cylinder head 10. However, since the guide hole 40 of the valve stem corresponding to the valve seat portion 18 in which the build-up portion of the cylinder head 10 is to be formed is directly supported by the positioning pin of the positioning means, the relatively high temperature laser beam Even if thermal deformation occurs in the cylinder head 10 due to the build-up process, the valve seat part 18 where the build-up part is to be formed has a target shape with respect to the axis of the guide hole 40 of the valve stem. Therefore, the processing surface of the valve seat portion 18 and the position of the laser beam to be irradiated are within a permissible range without relatively misalignment. Further, there is a suction means for sucking the air in the vicinity of the valve seat portion 18 via the manifold 16 or a gas supply means via the manifold 16 for cooling the metal powder (not shown) attached to the cylinder head rotating mechanism 34. Since the cylinder head 10 is also cooled, the surface to be processed of the valve seat portion 18 and the position of the laser beam to be irradiated are likely to fall within an allowable range without any deviation.

  FIG. 7 is an enlarged view of FIGS. 6 (a) and 6 (g).

  FIG. 8 is a view showing a pallet on which a cylinder head fixed to a valve seat forming cylinder head support device, which is a component of the valve seat forming laser build-up device of the present invention, is fixed.

  FIG. 8A shows the pallet 20 to which the cylinder head 10 fixed to the support base 42 is fixed when the valve seat 18 of one port 14 or the other port 15 located at the rightmost part is processed. FIG.

  When machining the valve seat 18 of one port 14 or the other port 15 located at the rightmost part, the cylinder head 10 was fixed at four locations of the clampers 44c, 44d, 44e, 44f of the support base 42. The pallet 20 is fixed.

  FIG. 8B shows the pallet 20 to which the cylinder head 10 fixed to the support base 42 is fixed when the valve seat portion 18 of one port 14 or the other port 15 located at the center portion is processed. FIG.

  When machining the valve seat 18 of one port 14 or the other port 15 located at the center, the cylinder head 10 is moved at six locations of the clampers 44a, 44b, 44c, 44d, 44e, 44f of the support base 42. The fixed pallet 20 is fixed.

  FIG. 8C shows the pallet 20 to which the cylinder head 10 fixed to the support base 42 is fixed when the valve seat portion 18 of the one port 14 or the other port 15 located at the leftmost portion is processed. FIG.

  When machining the valve seat 18 of one port 14 or the other port 15 located at the leftmost part, the cylinder head 10 was fixed at four locations of the clampers 44a, 44b, 44c, 44d of the support base 42. The pallet 20 is fixed.

  FIG. 9 is a diagram showing a method of fixing or releasing the cylinder head on the pallet. The cylinder head 10 is fixed to the pallet 20 by clamp arms 21 provided on the left and right sides of the upper and lower ends. The clamp arm 21 has a claw portion that presses the pallet 20 to the upper end portion and presses the pallet 20 against the reference surface 26 in a side view, and extends vertically on the side of the pallet 20. Extend in the horizontal direction so as to be adjacent to each other. And it is supported by the pallet 20 so that it can rotate in the part A extended in the up-down direction at the side of the pallet 20.

  The clamp arm 21 is urged by an urging member 48 such as a spring so as to press the pallet 20 against the reference surface 26 at the claw portion.

  The cylinder head 10 is released from the pallet 20 by rotating a portion around the portion A of the clamp arm 21 by pressing a portion of the lower portion of the pallet 20 adjacent to the upper and lower clamp arms 21 with the cylinder 50.

  As described above, according to the present embodiment, the valve seat of the cylinder head 10 in which the build-up portion is formed by the laser beam irradiation device 52 on the positioning pin 38 of the positioning mechanism 32 provided in the support device 30 by the transfer robot 62. The guide hole 40 of the valve stem corresponding to the portion 18 is inserted, and the cylinder head 10 on which the build-up portion is formed by the laser light irradiation device 52 is extracted from the positioning pin 38 of the positioning mechanism 32 provided in the support device 30. Next, the positioning pin 38 of the positioning mechanism 32 provided in the support device 30 is inserted into the guide hole 40 of the valve stem corresponding to the valve seat portion 18 of the cylinder head 10 where the build-up portion is formed by the laser light irradiation device 52. As described above, the cylinder head 10 is moved away from the support device 30. For this reason, the cylinder head 10 inserted into the support device 30 is heated by the laser light irradiation device 52 to form a build-up portion, and the cylinder head 10 with the build-up portion formed by the laser light irradiation device 52 is the support device 30. Then, the cylinder head 10 is moved away from the support device 30 in order to form a built-up portion on the valve seat 18 by the laser light irradiation device 52, so that the cylinder head 10 is cooled and the cylinder is cooled. The influence of thermal deformation of the head 10 can be reduced. Further, the cylinder head 10 positioned by the transfer robot 62 with the positioning pin 38 of the positioning mechanism 32 in the support device 30 corresponds to the valve seat portion 18 on which the build-up portion of the cylinder head 10 is formed. Rotating about the axis of the hole 40 and irradiating the metal powder supplied by the metal powder supply device 54 with laser light, a ring-shaped build-up portion is formed on the valve seat portion 18. Accordingly, by repeating the insertion of the cylinder head 10 into the support device 30 and the extraction of the cylinder head from the support device 30 by the transfer robot 62, it is possible to improve the position accuracy of the laser overlay processing with respect to the valve seat portion of the cylinder head. it can.

  In addition, the pallet 20 and the support stand 42, or the support apparatus 30 of this embodiment are equivalent to the support means of this invention. Further, the positioning mechanism 32 of the present embodiment corresponds to the positioning means of the present invention. Further, the cylinder head rotating mechanism 34 of the present embodiment corresponds to the rotating means of the present invention, and the laser light irradiation device 52 of the present embodiment corresponds to the laser light irradiation means of the present invention. Further, the metal powder supply device 54 of the present embodiment corresponds to the metal powder supply means of the present invention.

  Further, the processing of ST101 of the present embodiment corresponds to the insertion step of the present invention. Further, the process of ST104 of this embodiment corresponds to the laser light irradiation process and the rotation process of the present invention. Further, the process of ST107 of this embodiment corresponds to the extraction process and the movement process of the present invention.

It is a perspective view which shows the cylinder head applied to this invention. It is a figure for demonstrating the cylinder head support apparatus for valve seat formation which is a component of the laser build-up apparatus for valve seat formation of this invention. It is a figure which shows the laser beam irradiation apparatus and metal powder supply apparatus which are the components of the laser build-up apparatus for valve seat formation of this invention. It is a figure which shows the laser build-up apparatus for valve seat formation of this invention. It is a flowchart which shows the laser build-up method for valve seat formation of this invention. It is a figure explaining operation | movement of the cylinder head support apparatus for valve seat formation of this invention. It is an enlarged view of Drawing 6 (a) and Drawing 6 (g). It is a figure which shows the pallet with which the cylinder head fixed to the cylinder head support apparatus for valve seat formation of this invention was fixed. It is a figure which shows the method of fixing or canceling | releasing a cylinder head to a pallet. It is a figure which shows the state in which the cylinder head is hold | gripped by the robot hand of a transfer robot. It is a figure which shows the state in which the pallet to which the cylinder head is fixed is gripped by the robot hand of the transfer robot. It is a figure which shows the state inserted in a support apparatus so that the pallet with which the cylinder head is fixed may be hold | gripped with the robot hand of a transfer robot, and it may be positioned by a positioning mechanism.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Cylinder head, 12 ... Cylinder head recessed part, 14 ... One port, 15 ... Other port, 16 ... Manifold, 18 ... Valve seat part, 20 ... Pallet, 22, 24, 26 ... Reference plane, 21 ... Claire Ank arm, 22a, 22b, 24a, 24b ... leg, 30 ... cylinder head support device (support device) for valve seat formation, 32 ... positioning mechanism, 34 ... cylinder head rotation mechanism, 36 ... cylinder, 38 ... positioning pin, 40 ... Guide hole, 42 ... Support base, 44, 44a, 44b, 44c, 44d, 44e, 44d ... Clamper, 46 ... Heating part, 48 ... Biasing member, 50 ... Cylinder, 52 ... Laser light irradiation device, 54 ... Metal Powder supply device, 55 ... first drive source, 56 ... second drive source, 57 ... third drive source, 58 ... fourth drive source, 60 ... valve seat Forming laser buildup equipment transfer, 62 ... transfer robot, 64 ... robot hand, 66 ... robot.

Claims (4)

A valve seat forming laser build-up device for forming a build-up portion by supplying metal powder to a plurality of valve seat portions arranged in a cylinder head while solidifying the metal powder by irradiating it with laser light. There,
Support means for supporting the cylinder head;
Positioning means for positioning the cylinder head based on a positioning pin provided in the support means and inserted into a guide hole of a valve stem corresponding to a valve seat portion in which the build-up portion of the cylinder head is formed;
A rotating means for rotating the cylinder head positioned by the positioning means around an axis of a guide hole of the valve stem;
Metal powder supply means for supplying metal powder to the valve seat portion positioned by the positioning means;
Laser light irradiation means for irradiating the metal powder supplied by the metal powder supply means with laser light to form a ring-shaped buildup portion on the valve seat portion rotated by the rotation means;
Inserting a positioning pin of the positioning means provided in the support means into a guide hole of the valve stem corresponding to the valve seat part of the cylinder head in which the build-up part is formed by the laser light irradiation means, The cylinder head in which the build-up portion is formed by the laser light irradiation means is extracted from the positioning pin of the positioning means provided in the support means, and then the build-up portion is formed by the laser light irradiation means. as the positioning pins of the positioning means provided on said support means in the guide hole of the valve stem which corresponds to the valve seat of the cylinder head is inserted, it is moved apart the cylinder from the support means A laser build-up device for forming a valve seat, comprising: a transfer robot. A valve seat forming laser build-up method for forming a build-up portion by supplying metal powder to a plurality of valve seat portions arranged in a cylinder head while solidifying the metal powder by irradiating the metal powder with laser light. There,
The cylinder on the basis of a positioning pin provided in the guide hole of the valve stem corresponding to the valve seat portion corresponding to the valve seat portion on which the support portion for supporting the cylinder head and the build-up portion of the cylinder head is formed. positioning means for positioning the head, and provided with a transfer robot for moving the cylinder head, by the transfer robot, the positioning pins of the positioning means provided on the supporting means, the padding portion is formed An insertion step of inserting into the guide hole of the valve stem corresponding to the valve seat portion of the cylinder head;
Supplies metal powder to the valve seat portion of the cylinder head the positioning pins are inserted in said positioning means provided on said support means by said insertion step, the valve is irradiated with a laser beam to the metal powder And a laser beam irradiating step of forming a build-up portion on the sheet portion. In the laser embedding method for valve seat formation according to claim 2,
In the laser beam irradiation step, a rotation step of simultaneously rotating the cylinder head into which the positioning pin of the positioning unit provided in the support unit is inserted in the insertion step around the guide hole of the valve stem is performed. A method of laser embedding for forming a valve seat. In the laser cladding method for valve seat formation according to claim 2 or 3,
By the transfer robot, and an extraction step for extracting the cylinder head padding is formed by the irradiation of the laser beam, from the positioning pins of the positioning means provided on said supporting means,
Wherein the transfer robot, then the valve stem guide the positioning means provided on said support means in a hole corresponding to the valve seat portion of the cylinder head padding is formed by the irradiation of the laser beam And a moving step of moving the cylinder head away from the support means so that a positioning pin is inserted.

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