JP2010099673A - Cylinder head-supporting device for valve seat formation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder head-supporting device for valve seat formation which can improve the positional accuracy of a laser padding to the valve seat part of a cylinder head. <P>SOLUTION: The cylinder head supporting device 30 for valve seat formation includes: a pallet 20 and a supporting base 42 for supporting a cylinder head 10; a positioning mechanism 32 for positioning the cylinder head 10 with a positioning pin 38 as a reference that is inserted into a guide hole 40 of a valve stem corresponding to the valve seat part 18 on which the padding is formed for the cylinder head 10; and a cylinder head rotating mechanism 34 for rotating the cylinder head 10 which is positioned by the positioning mechanism 32, around the axial line of the guide hole 40 of the valve stem. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a cylinder head for forming a built-up portion by supplying a metal powder to a plurality of valve seats arranged in a cylinder head and solidifying the metal powder after being irradiated with a laser beam and melted. The present invention relates to a cylinder head support device for forming a valve seat that supports the valve seat.

  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 Cylinder head support device for valve seat formation having a positioning portion that moves and positions so as to slide Known (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 constant temperature, a constant temperature preheating is applied.
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.

  An object of this invention is to provide the cylinder head support apparatus for valve seat formation which can improve the position accuracy of the laser build-up process with respect to the valve seat part of a cylinder head.

  The cylinder seat support device for forming a valve seat according to the present invention builds up the metal powder by supplying the metal powder to a plurality of valve seat portions arranged in the cylinder head while irradiating the metal powder with laser light and solidifying it after melting. A valve seat forming cylinder head support device for supporting the cylinder head to form a portion, the support means for supporting the cylinder head, provided in the support means, and the build-up portion of the cylinder head Positioning means for positioning the cylinder head with reference to a positioning pin inserted into a guide hole of the valve stem corresponding to the valve seat portion to be formed, and the cylinder head positioned by the positioning means to the guide hole of the valve stem Rotating means for rotating around the axis is provided.

  According to the present invention, the cylinder head positioned by the positioning pin of the positioning means is rotated around the axis of the guide hole of the valve stem corresponding to the valve seat portion where the build-up portion of the cylinder head is formed. Accordingly, 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.

  In the cylinder head support device for forming a valve seat according to the present invention, the rotating means may be connected to a suction means for sucking air in the vicinity of the valve seat portion via the manifold of the cylinder head, or to the valve seat portion. It is preferable to have gas supply means for supplying gas.

  According to this preferred embodiment, when the valve seat portion of the cylinder head is heated by the laser beam for laser build-up processing, the air in the vicinity of the valve seat portion is sucked or gas is supplied to the valve seat portion to Since the head is cooled, the influence of heat on the valve seat portion of the cylinder head can be reduced.

  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 3 are views for explaining a cylinder head support device for forming a valve seat according to 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.

  The positioning mechanism 32 includes a cylinder 36 and a positioning pin 38. The positioning pin 38 is inserted so as to be fitted in the guide hole 40 of the valve stem corresponding to the valve seat portion 18 on which the cylinder head 10 is laser-embedded to position the cylinder head 10. The positioning pin 38 of the positioning mechanism 32 is 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.

  The laser build-up process is a process for forming a build-up part by supplying a metal powder and irradiating the metal powder with a laser beam to melt and then solidifying the metal powder. In laser overlay processing, gas is supplied to the valve seat portion 18 via the manifold 16 of the cylinder head 10 or the vicinity of the valve seat portion 18 via the manifold 16 so as to cool the molten metal powder. Aspirate the atmosphere. Examples of the metal powder include copper alloy metal powder having excellent heat resistance and wear resistance. After the build-up layer is formed, a smooth valve seat surface is formed by machining.

  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 rotary table of a support base 42 that is coaxial with the positioning mechanism 32 is rotated by a worm fixed to the support base 42. 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.

  Next, the operation of the valve seat forming cylinder head support device 30 of the present invention will be described.

  FIG. 3 is a view for explaining the operation of the valve seat forming cylinder head support device of the present invention.

  First, as shown in FIG. 3 (b), the cylinder head 10 fixed to the pallet 20 is perpendicular to the guide hole 40 of the valve stem corresponding to the valve seat portion 18 of the one port 14 where the laser build-up processing is performed. The positioning pin 38 in the state is inserted, and the pallet 20 on which the cylinder head 10 is fixed is put into the support base 42.

  Next, as shown in FIG. 3A, the support base 42 is tilted to the left by the tilt mechanism 35, and the support base 42 is set to approximately 45 ° so that the processing surface of the valve seat portion 18 is substantially horizontal. At the same time, the support base 42 is rotated around the axis of the positioning pin 38 by the cylinder head rotating mechanism 34 to perform laser overlay processing. Thereafter, as shown in FIG. 3B, the cylinder head 10 is pulled out of the positioning pin 38 and the pallet 20 to which the cylinder head 10 is fixed is placed above the positioning pin 38 as shown in FIG. Move to.

  Then, as shown in FIG. 3 (d), the valve corresponding to the valve seat portion 18 of the other port 15 which is paired with one port 14 of the valve seat portion 18 which is laser-embedded in FIG. 3 (a). The pallet 20 to which the cylinder head is fixed is rotated so that the guide hole 40 of the stem is directly below the positioning pin 38 of the support base 42.

  Thereafter, as shown in FIG. 3 (e), the cylinder head 10 is positioned by inserting a 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. 3 (d). .

Then, the laser build-up processing can be performed on the processing surface of the valve seat portion 18 of the other port 15 in FIG. 3D with the same positional relationship as the build-up processing in FIG. As shown in (f), the cylinder head rotating mechanism 34 is rotated around the axis of the positioning pin 38.
Thereafter, as shown in FIG. 3 (g), as in FIG. 3 (a), the support base 42 is tilted to the left by the tilt mechanism 35, and the processing surface of the valve seat portion 18 is substantially horizontal. In addition, the support base 42 is set to approximately 45 °, and the support base 42 is rotated around the axis of the positioning pin 38 by the cylinder head rotating mechanism 34 to perform laser overlay processing.

  Thereafter, as shown in FIG. 3 (f) again, the cylinder head 10 is pulled out of the positioning pin 38 and the pallet 20 to which the cylinder head 10 is fixed is discharged from the support base 42 as in FIG. 3 (c). .

  3 (a) and 3 (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. 4 is an enlarged view of FIGS. 3 (a) and 3 (g).

  FIG. 5 is a view showing a pallet to which a cylinder head fixed to the cylinder seat support device for forming a valve seat of the present invention is fixed.

  FIG. 5A shows the pallet 20 to which the cylinder head 10 fixed to the support base 42 is fixed when the valve seat part of one port 14 or the other port 15 located at the rightmost part is processed. FIG.

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

  FIG. 5B is a view showing the pallet 20 to which the cylinder head 10 fixed to the support base 42 is fixed when the valve seat part of one port 14 or the other port 15 located at the center part is processed. It is.

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

  FIG. 5C shows the pallet 20 to which the cylinder head 10 fixed to the support base 42 is fixed when the valve seat portion of one port 14 or the other port 15 located at the leftmost portion is processed. FIG.

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

  FIG. 6 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. Are extended 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 cylinder head 10 positioned by the positioning pin 38 rotates around the axis of 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 formed. Is done. Therefore, it is possible to improve the position accuracy of the laser build-up processing with respect to the valve seat portion 18 of the cylinder head 10.

  In addition, the pallet 20 and the support base 42 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.

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 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 3 (a) and Drawing 3 (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.

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 for valve seat formation, 32 ... Positioning mechanism, 34 ... Cylinder head rotating mechanism, 35 ... Tilt mechanism, 36 ... Cylinder, 38 ... Positioning pin, 40 ... guide hole, 42 ... support base, 44, 44a, 44b, 44c, 44d, 44e, 44d ... clamper, 46 ... heating section, 48 ... biasing member, 50 ... cylinder.

Claims (2)

A valve that supports the cylinder head in order to form a build-up part by supplying the metal powder to a plurality of valve seat parts arranged in the cylinder head while solidifying the metal powder by irradiating the metal powder with laser light. A cylinder head support device for sheet formation,
Support means for supporting the cylinder head;
Positioning means for positioning the cylinder head with reference to 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;
Rotating means for rotating the cylinder head positioned by the positioning means around an axis of a guide hole of the valve stem. In the cylinder seat support device for valve seat formation according to claim 1,
The rotating means has a suction means for sucking the atmosphere in the vicinity of the valve seat portion through a manifold of the cylinder head, or a gas supply means for supplying gas to the valve seat portion. Cylinder head support device for valve seat formation.

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