JP2011125866A - Workpiece heating device and lubricant applying system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece heating device capable of quickly heating a workpiece and also to provide a lubricant applying system. <P>SOLUTION: The workpiece heating device 10 includes a pair of belt conveyors 21, 21 that are arranged side by side with a space apart, wherein the workpiece 90 is conveyed while it is placed on the pair of belt conveyors 21, 21 while straddling over the space. Then, in a hot water jetting part 30 in the middle of a conveyance route by the belt conveyors 21, 21, the workpiece 90 is heated by pouring hot water from top and bottom in two directions and, in an air blowing part 35, the workpiece 90 is dried by blowing off air thereto from top and bottom in two directions. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a workpiece heating device that heats a workpiece before applying an aqueous lubricant for cold forging to the workpiece, and a lubricant coating system that includes the workpiece heating device.

  Conventionally, this type of work heating apparatus is configured to heat a work by blowing warm air onto the work. The reason for heating the workpiece in advance before applying the aqueous lubricant for cold forging to the workpiece is as follows. That is, when the workpiece is preheated, when the water-based lubricant is applied, the water-based lubricant is quickly dried by the heat of the workpiece and the flow is prevented, and the lubricating coating film formed from the water-based lubricant is formed. This is because the thickness becomes uniform and the forging quality is improved (see, for example, Patent Document 1).

JP 2009-190052 A (paragraphs [0015] and [0025])

  However, when the above-described conventional workpiece heating apparatus is used, there is a problem that it takes a long time to heat the workpiece and the production efficiency is lowered.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a workpiece heating apparatus and a lubricant application system capable of quickly heating a workpiece.

  The work heating apparatus according to the invention of claim 1 made to achieve the above object is a work heating apparatus for heating a work before an aqueous lubricant for cold forging is applied to the work. It has a feature in that it has a hot water jet part for jetting hot water toward the head and an air spray part for blowing air to a work heated by the hot water jet part and drying it.

  According to a second aspect of the present invention, there is provided the work heating apparatus according to the first aspect, wherein the work heating apparatus has a pair of belt conveyors arranged side by side with a gap therebetween, and the workpiece is placed on the pair of belt conveyors in a state of straddling the gap. Is provided, and a hot water ejection part is disposed on the upstream side in the work conveyance direction by the work conveyance apparatus, while an air blowing part is disposed on the downstream side. The lower hot water ejection nozzle that is disposed between the belt conveyors and ejects hot water from below to the workpiece, and is disposed at a position facing the lower hot water ejection nozzle in the vertical direction across the workpiece. Lower air jet nozzle that is arranged between a pair of belt conveyors and blows air from below to the workpiece. When, characterized in place consisting of being disposed to face in the vertical direction across the workpiece with respect to the lower air ejection nozzle, an upper air ejection nozzle for blowing air from above the workpiece.

  A third aspect of the present invention is the workpiece heating apparatus according to the second aspect, wherein the workpiece conveying device is configured to intermittently convey the workpiece every predetermined pitch, and includes a plurality of hot water ejection portions and one air spray. The parts are arranged at intervals of a constant pitch in the workpiece conveyance direction.

  Invention of Claim 4 is the workpiece | work heating apparatus of Claim 2 or 3, It is arrange | positioned under a pair of belt conveyors, The warm water collection | recovery container which collects the warm water which was ejected from the warm water ejection part, and warm water collection | recovery It has a feature in that it is provided with a hot water heater that heats the hot water collected in the container and supplies it to the hot water ejection section.

  A fifth aspect of the present invention is the work heating apparatus according to any one of the second to fourth aspects, wherein the hot water ejecting part and the air blowing part and the work in a state of receiving hot water or air from them are covered. In addition to providing a scattering prevention case, an intermediate partition wall is provided for partitioning the inside of the mist scattering prevention case into a heating area containing the hot water jetting part and a drying area containing the air blowing part, and the workpiece transport direction in the mist scattering prevention case The both end walls and the intermediate partition wall are formed with penetrating workpiece passage openings at positions lower than the upper hot water ejection nozzle and the upper air ejection nozzle, and both ends of the pair of belt conveyors are It is characterized by being extended to the outside of the mist scattering prevention case by a certain pitch or more.

  A sixth aspect of the present invention is the workpiece heating apparatus according to any one of the second to fifth aspects, wherein the workpiece is an outer race of a constant velocity joint, and is formed of a bottom wall of a cylindrical portion having one end. A cylindrical part is projected from the center of the outer surface, and a chamfered slope is formed on the outer edge of the outer surface of the bottom wall. The workpiece transfer device is a pair of belt conveyors at two locations on the opening edge of the cylindrical portion of the workpiece. The lower hot water jet nozzle is configured to be transportable in a state of being placed on the upper side, and the lower hot water jet nozzle jets hot water toward the inside of the cylindrical portion of the workpiece, while the upper hot water jet nozzle has at least two locations on the chamfered slope of the workpiece. It is characterized in that it is ejected so as to pour warm water from above toward the end face of the cylindrical portion.

  According to a seventh aspect of the present invention, there is provided a lubricant application system comprising: the work heating apparatus according to any one of the first to sixth aspects; and lubrication for applying an aqueous lubricant for cold forging to a work heated by the work heating apparatus and dried. A lubricant application system comprising a lubricant application device, the lubricant application device comprising: a lubricant application case capable of accommodating a workpiece; an upper surface work receiving port formed on an upper surface of the lubricant application case; and a workpiece heating device A workpiece transfer robot that holds the heated and dried workpiece and holds and holds it in the lubricant application case from the upper surface workpiece receptacle, and sprays the aqueous lubricant in the form of a mist in the lubricant application case And a lubricant spraying part to be applied.

  The invention of claim 8 is the lubricant application system according to claim 7, wherein the workpiece transfer robot has a workpiece rotation drive unit that rotates the gripped workpiece around its central axis, It is characterized in that the water-based lubricant is sprayed from the direction intersecting the central axis of the workpiece rotated by the workpiece rotation driving unit.

[Invention of Claim 1]
In the workpiece heating apparatus according to the first aspect, since the workpiece is heated with warm water, heat can be transmitted to the workpiece more efficiently and quickly compared with the conventional device heated with warm air. Also, instead of sinking the work in the hot water, the hot water is jetted toward the work and the hot water flows through the work surface, so the hot water deprived of heat by the work does not stay around the work. Can efficiently and quickly heat the workpiece.

[Invention of claim 2]
In the workpiece heating apparatus according to the second aspect, the workpiece is placed so as to straddle a pair of belt conveyors arranged side by side with a gap, and is sequentially fed from the hot water jetting portion to the air blowing portion. And in a warm water ejection part, warm water is poured on a workpiece | work from both the upper and lower directions by the upper side hot water ejection nozzle and the lower side hot water ejection nozzle. Thereby, a workpiece | work can be heated rapidly. Next, when the workpiece is fed to the air blowing section, air is blown onto the workpiece from both the upper and lower directions by the upper air ejection nozzle and the lower air ejection nozzle. Thereby, a workpiece | work can be dried rapidly.

[Invention of claim 3]
In the work heating apparatus according to claim 3, if the work is arranged and transported on a pair of belt conveyors at a constant pitch, the work passes through a plurality of hot water ejection portions and is heated a plurality of times, and then the air is heated. It is dried in the spraying part. Thereby, the heating time can be made longer than the drying time of the workpiece, and the workpiece can be sufficiently heated.

[Invention of claim 4]
Since the workpiece | work heating apparatus of Claim 4 collect | recovers the warm water used in order to heat a workpiece | work, and heats and reuses it for a workpiece | work heating, the effective utilization of the heat remaining in warm water is aimed at, and environmental performance is improved. Also excellent.

[Invention of claim 5]
In the workpiece heating apparatus according to the fifth aspect, since the hot water jetting unit, the air blowing unit, and the workpiece are covered with the mist scattering prevention case, it is possible to prevent the mist from scattering to the surroundings. In addition, since both ends of the pair of belt conveyors are extended to the outside of the mist scattering prevention case by a certain pitch or more, if the work is placed on the upstream end of the belt conveyor, the belt conveyor is driven. The workpiece is taken into the mist splash prevention case. Further, at the downstream end of the belt conveyor, the work discharged from the mist scattering prevention case can be waited on the belt conveyor while waiting for conveyance to the subsequent process.

[Invention of claim 6]
According to the structure of Claim 6, it can heat from both the inner side and the outer side of the cylinder part of an outer race.

[Invention of Claim 7]
According to the lubricant application system of claim 7, since the work can be quickly heated by the work heating device before the aqueous lubricant is applied to the work by the lubricant application device, the operating rate of the lubricant application device Can be increased.

[Invention of Claim 8]
According to the lubricant application system of the eighth aspect, since the aqueous lubricant is sprayed from the direction intersecting with the central axis of the work in a state where the work is rotationally driven, the aqueous lubricant is uniformly applied to the work. Thereby, the thickness of the lubricant layer formed by drying the aqueous lubricant is made uniform.

1 is a side sectional view of a workpiece heating apparatus according to an embodiment of the present invention. Cross-sectional side view of lubricant application system 1 is a side sectional view of the workpiece heating device taken along the line AA in FIG. Side sectional view of the hot water jet 1 is a side sectional view of the workpiece heating device taken along the line BB in FIG. 2 is a cross-sectional side view taken along the line CC in FIG. 2 of the lubricant application device.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a workpiece heating apparatus 10 according to this embodiment, and FIG. 2 shows a lubricant application system 70 including a workpiece heating apparatus 10 and a lubricant application apparatus 11. Then, after the workpiece 90 is heated and dried by the workpiece heating device 10, an aqueous lubricant for cold forging is applied to the workpiece 90 of the lubricant application device 11.

  The workpiece 90 of the present embodiment is, for example, an outer race that constitutes a part of a constant velocity joint, and a cylindrical portion 93 is protruded from a bottom wall 92 of a cylindrical portion 91 with one end as shown in FIG. It has a structure. The cylindrical portion 93 is disposed at the center of the outer surface of the bottom wall 92, and a chamfered slope 94 is formed on the outer edge portion of the outer surface of the bottom wall 92. The cylindrical portion 91 has a shape in which a plurality of grooves and protrusions extending in the axial direction are repeated in the circumferential direction. After the outer race as the workpiece 90 is applied with a water-based lubricant by the lubricant application system 70, the outer race of the final shape is completed by “forging” by cold forging.

  As shown in FIG. 1, the workpiece | work heating apparatus 10 is provided with the workpiece conveyance apparatus 20 for moving and conveying the some workpiece | work 90 horizontally. As shown in FIG. 3, the workpiece transfer device 20 includes a pair of belt conveyors 21 and 21 arranged side by side with a gap therebetween. As shown in FIG. 1, each of these belt conveyors 21 is formed by bridging a conveyor belt 21 </ b> B between a pair of pulleys 21 </ b> P and 21 </ b> P. In addition, a pair of linear portions stretched between the pulleys 21P and 21P in the transport belt 21B extend in the horizontal direction and face each other in the vertical direction. Furthermore, as shown in FIG. 2, the pulleys 21P and 21P of both belt conveyors 21 and 21 are key-connected to a common drive shaft 21S. Thereby, the feeding speeds of the conveyor belts 21B and 21B of both belt conveyors 21 and 21 are the same.

  As shown in FIG. 3, the upper straight portion of the conveyor belt 21 </ b> B is supported by the support rail 22 from below and the downward slack is restricted. Further, the support rails 22 and 22 of the pair of belt conveyors 21 and 21 are connected by a connecting beam 23 at a plurality of locations in the longitudinal direction. Thereby, the space | interval of the belt conveyors 21 and 21 is kept constant. Then, the first transfer robot R1 shown in FIG. 1 grips the work 90 and places the work 90 on the start end (the right end in FIG. 1) of the work transfer device 20. Specifically, as shown in FIG. 3, the first transfer robot R1 causes the workpiece 90 to be placed on the upper surfaces of the transfer belts 21B and 21B with the open end face of the cylindrical portion 91 straddling the gap between the belt conveyors 21 and 21. It is mounted in a contact state. Each time the first transfer robot R1 places the workpiece 90 on the starting end of the workpiece transfer device 20, the transfer belts 21B and 21B are fed by a fixed pitch (hereinafter referred to as “feed pitch” as appropriate). . In FIG. 1, the interval between the workpieces 90 and 90 appears as a feeding pitch.

  The workpiece heating device 10 is provided with a mist scattering prevention case 24. The mist scattering prevention case 24 has a substantially rectangular parallelepiped shape as a whole. As shown in FIG. 1, the workpiece transfer device 20 (belt conveyors 21, 21) penetrates the position near the lower end of the mist scattering prevention case 24 in the horizontal direction. Thus, both end portions (start end portion and end end portion) of the work transfer device 20 are exposed to the outside of the mist scattering prevention case 24. Moreover, as shown in FIG. 3, the bottom wall 24A on the lower end side of the mist scattering prevention case is inclined toward one place, and a hot water recovery duct 24D is connected to the lowermost end portion thereof, which will be described later. Used hot water is discharged. In the present embodiment, the lower end portion of the mist scattering prevention case 24 is a “hot water recovery container” according to the present invention.

  As shown in FIG. 1, the mist scattering prevention case 24 is approximately five times as large as the feeding pitch in the workpiece conveyance direction. Further, in the mist scattering prevention case 24, an intermediate partition wall 25 is provided at a position away from the terminal portion in the workpiece feeding direction by one feeding pitch on the upstream side, and the mist scattering prevention case 24 is provided by the intermediate partition wall 25. 24 is partitioned into a heating chamber 24X and a drying chamber 24Y on the upstream side in the workpiece feeding direction.

  As a representative example, the pair of side walls 24S, 24S and the intermediate partition wall 25 arranged in the workpiece feeding direction in the mist scattering prevention case 24 have a pair of belt insertion holes 26A as shown in FIG. 26A and a work insertion hole 26B. The pair of belt insertion holes 26A, 26A are arranged near the lower end of the mist scattering prevention case 24 and have a horizontally long rectangular shape. The belt insertion holes 26A, 26A are connected to the conveying belts 21B, 21B in the belt conveyors 21, 21. The straight line is inserted. Thus, as described above, the work transfer device 20 (the belt conveyors 21 and 21) penetrates the position near the lower end of the mist scattering prevention case 24 in the horizontal direction.

  The workpiece insertion hole 26B is for allowing the workpiece 90 standing on the workpiece conveyance device 20 to pass through, and communicates with the central portion in the left-right direction of the upper belt insertion hole 26A and extends upward. The lower half of the workpiece insertion hole 26B is relatively wide corresponding to the cylindrical portion 91 of the workpiece 90, and the upper half of the workpiece insertion hole 26B corresponds to the cylindrical portion 93 of the workpiece 90. It is relatively narrow. Note that the workpiece insertion hole 26B has a size that allows a plurality of types of outer races 90, which are slightly different in size and shape, to pass therethrough.

  In addition, a pair of guide rails 26G and 26G extend in the mist scattering prevention case 24. The guide rails 26G and 26G are formed of a wire having a circular cross section extending over the entire workpiece feeding direction, and are supported by a plurality of support arms 26H protruding from the inner surface of the mist scattering prevention case 24, and are belt conveyors 21 and 21. It is arranged above. And the state where the workpiece | work 90 straddled on a pair of belt conveyors 21 and 21 is maintained by these guide rails 26G and 26G.

  As shown in FIG. 1, the heating chamber 24 </ b> X is provided with, for example, four hot water ejection units 30 in the workpiece conveyance direction. As shown in FIG. 3, each hot water jet section 30 is arranged between a pair of belt conveyors 21 and 21, and the hot water jet section 30 is a lower hot water jet that can jet hot water from below to the workpiece 90. It consists of a nozzle 32 and an upper hot water jet nozzle 31 which is disposed at a position facing the lower hot water jet nozzle 32 in the vertical direction across the work 90 and can jet hot water from above to the work 90. .

  More specifically, a pair of pipe insertion holes 27 and 27 for each hot water ejection section 30 are paired up and down on the front wall 24F arranged in one of the heating chambers 24X in the direction orthogonal to the workpiece transfer direction. Is formed. A rectangular pipe 31B connected to the tip of a hot water supply pipe 31A extending in a horizontal direction orthogonal to the workpiece transfer direction is inserted into the upper pipe insertion hole 27, and the tip of the square pipe 31B is an upper hot water jet nozzle. 31. The rectangular pipe 31B includes a main flow path 31M communicating with the hot water supply pipe 31A, and three jet flow paths 31S are branched downward from the main flow path 31M at the upper hot water jet nozzle 31 at the tip of the square pipe 31B. It extends.

  On the other hand, a hot water supply pipe 32A extending in a horizontal direction perpendicular to the workpiece transfer direction is inserted into the lower pipe insertion hole 27, and a lower hot water jet nozzle 32 projects upward from the tip of the hot water supply pipe 32A. ing. The lower hot water ejection nozzle 32 includes a flow path (not shown) that is narrower than that in the hot water supply pipe 32A.

  In front of the outer side of the mist scattering prevention case 24, first and second basic pipes (not shown) extending in the workpiece feeding direction are arranged in parallel in the vertical direction. The base end of the hot water supply pipe 31A group is commonly connected to the first main pipe, and the base end of the hot water supply pipe 32A group is commonly connected to the second main pipe. In addition, as shown in FIG. 3, a hot water supply device 40 is connected to the base end portion of the first main pipe via the first manual opening / closing valve 31V, and the base end portion of the second main pipe is A hot water supply device 40 is connected via the second manual opening / closing valve 32V. Thus, when the first manual open / close valve 31V is opened, hot water is supplied from the hot water supply device 40 to each upper hot water jet nozzle 31, and when the second manual open / close valve 32V is opened, each lower hot water jet is discharged from the hot water supply device 40. Hot water is supplied to the nozzle 32. In the present embodiment, the first and second manual opening / closing valves 31V and 32V are maintained in a state of being opened at a constant opening degree. Then, when the work 90 is disposed directly below the upper hot water jet nozzle 31 when the hot water is jetted out from the three jet passages 31S of the upper hot water jet nozzle 31 so as to flow downward, the outer surface of the work 90 The whole is covered with warm water. Specifically, as shown in FIG. 4, the hot water jetted from the central jet passage 31 </ b> S of the upper hot water jet nozzle 31 pours onto the end surface of the cylindrical portion 93 of the work 90, and the entire outer peripheral surface of the cylindrical portion 93 is spread. It travels down. Further, the hot water jetted from the jet passages 31 </ b> S and 31 </ b> S on both sides of the upper hot water jet nozzle 31 pours into the chamfered slope 94 corresponding to the shoulder portion of the cylinder portion 91 of the work 90, and travels along the chamfered slope 94. It spreads to the side and flows downward along substantially the entire outer peripheral surface of the cylindrical portion 91. Thereby, the whole outer surface in the workpiece | work 90 is covered with warm water.

  Further, when hot water is jetted upward and at a wide angle from the lower hot water jet nozzle 32, and the work 90 is disposed immediately above the lower hot water jet nozzle 32, the inside of the cylindrical portion 91 in the work 90 is Hot water is applied to almost the whole.

  In addition, the warm water ejected from the upper warm water ejection nozzle 31 and the lower warm water ejection nozzle 32 is heated to, for example, 75 to 95 degrees by the warm water supply device 40. Further, the used hot water is collected in the hot water recovery duct 24D at the lower end of the mist scattering prevention case 24 as described above, taken into the hot water supply device 40, and reused.

  As shown in FIG. 1, an air blowing unit 35 is provided in the drying chamber 24 </ b> Y with an interval corresponding to one feeding pitch by the work transfer device 20 with respect to the hot water jetting unit 30 disposed on the downstream side. ing. The air blowing part 35 is arranged between a pair of belt conveyors 21 and 21, as shown in FIG. 5, and a lower air blowing nozzle 37 for blowing air from below to the work 90, and a lower air blowing. The upper air ejection nozzle 36 is disposed at a position facing the nozzle 37 in the vertical direction across the work 90 and blows air from above to the work 90. Specifically, a pair of pipe insertion holes 27, 27 are formed on the front wall 24F in the drying room 24Y, similarly to the front wall 24F of the heating room 24X. An upper air ejection nozzle 36 and a lower air ejection nozzle 37 are provided at the ends of the air supply pipes 36A and 37A inserted through the pipe insertion holes 27 and 27. Moreover, the solenoid valve 35X, the heater 35Y, and the compressor 35Z are connected to the base end part of air supply pipe 36A, 37A in order.

  The lower air ejection nozzle 37 is provided with only one air ejection port, and the air ejected from the lower air ejection nozzle 37 is blown over the entire inner surface of the cylindrical portion 91 of the workpiece 90. The upper air ejection nozzle 36 is provided with air ejection ports, for example, at a position facing the air ejection port of the lower air ejection nozzle 37 and at a position obtained by dividing the circumference into four equal parts. Then, the air ejected from these air ejection ports is blown over the entire outer surface of the workpiece 90. And when the workpiece | work 90 is arrange | positioned between the upper side air ejection nozzle 36 and the lower side air ejection nozzle 37, the electromagnetic valve 35X opens, and the air supplied from the compressor 35Z is heated by the heater 35Y, and the electromagnetic valve The air is supplied to the upper air jet nozzle 36 and the lower air jet nozzle 37 through 35X, and hot air (warm air) is supplied to the work 90 from the air jet outlets of the upper air jet nozzle 36 and the lower air jet nozzle 37. It is sprayed toward.

  The description regarding the workpiece heating apparatus 10 is as described above. As illustrated in FIG. 2, the lubricant application device 11 includes a lubricant application case 50. As shown in FIG. 6, the lubricant application case 50 has an upper surface work accommodation port 51 formed on the upper surface, from which the work 90 can be accommodated in the lubricant application case 50. In order to transport the workpiece 90, the lubricant application device 11 is provided with a second transport robot R2 (corresponding to the “work transport robot” of the present invention). The second transfer robot R2 has a robot hand 99 capable of gripping the base end portion of the cylindrical portion 93 of the workpiece 90 at the tip, and a horizontal drive mechanism that horizontally moves the robot hand 99 and a vertical drive that moves the robot hand 99 up and down. And a work rotation driving mechanism for rotating the robot hand 99 around the vertical axis. When the workpiece 90 heated and dried by the workpiece heating device 10 is discharged from the mist scattering prevention case 24 and disposed at the end portion of the workpiece conveyance device 20 (see FIG. 1), the second conveyance robot R2 is The workpiece 90 is lifted by gripping it, inserted into the lubricant application case 50 from the upper surface work accommodating port 51 of the lubricant application case 50, rotated at a constant speed, and then raised and moved to a predetermined collection place. 90 is placed.

  In the lubricant application case 50, a lubricant spraying portion 52 according to the present invention is provided. The lubricant spray part 52 includes a pair of lubricant spray nozzles 53 and 54. One lubricant spray nozzle 53 is spaced apart from the workpiece 90 held by the robot hand 99 in the lubricant application case 50 by a predetermined distance to the side, and the central axis of the outlet of the lubricant spray nozzle 53 is horizontal. It is arrange | positioned so that it may cross | intersect the intermediate position of the up-down direction in the cylinder part 91 of the workpiece | work 90. The lubricant spray nozzle 53 sprays the water-based lubricant in the form of a mist, and sprays the water-based lubricant over the workpiece 90 in the vertical direction. At this time, since the workpiece 90 is rotationally driven by the robot hand 99, the aqueous lubricant is sprayed uniformly on the entire outer surface of the workpiece 90.

  The other lubricant spray nozzle 54 is spaced a predetermined distance downward from the workpiece 90 held by the robot hand 99 in the lubricant application case 50, and the central axis of the jet port of the lubricant spray nozzle 54 is It is inclined by a predetermined angle (for example, 35 degrees) with respect to the central axis, and is arranged so as to intersect with the inner side surface of the cylindrical portion 91 of the workpiece 90. The lubricant spray nozzle 54 also sprays the aqueous lubricant in the form of a mist, and sprays the aqueous lubricant over the entire inner surface of the cylindrical portion 91 in the vertical direction. At this time, since the workpiece 90 is rotationally driven by the robot hand 99, the aqueous lubricant is sprayed uniformly on the entire inner surface of the cylindrical portion 91.

  In the lubricant application case 50, the tip of the drying air jet nozzle 55 for jetting air for drying the aqueous lubricant applied to the workpiece 90 and the tips of the lubricant spray nozzles 53 and 54 are manufactured. A cleaning air jet nozzle 56 for jetting air for the purpose is provided.

  This completes the description of the lubricant application system 70 of the present embodiment. Next, the effect of the lubricant application system 70 will be described. The workpiece 90 is formed into a shape having a cylindrical portion 91 and a cylindrical portion 93 as shown in FIG. 3 through a plurality of cold forging steps from a metal cylindrical body. Then, the workpieces 90 are placed on the upper surface of the starting end portion of the workpiece conveying device 20 in the workpiece heating device 10 one by one by the first conveying robot R1 through a shot blasting process. Specifically, when the work conveying device 20 feeds the conveying belts 21B and 21B of the pair of belt conveyors 21 and 21 at a constant pitch, the work conveying device 20 repeats the operation of stopping for a predetermined time and then feeding at a constant pitch. Then, the first transfer robot R1 places the workpiece 90 so as to straddle both the belt conveyors 21 and 21 during the feeding stop period of the workpiece transfer device 20. As a result, a plurality of workpieces 90 are fed in a state of being placed side by side at a constant pitch in the workpiece conveyance direction on the workpiece conveyance device 20, and sequentially enter the mist scattering prevention case 24 in the workpiece heating device 10. I will do it.

  The workpiece 90 that has entered the mist splash prevention case 24 is disposed between the upper hot water jet nozzle 31 and the lower hot water jet nozzle 32 in the hot water jet section 30 when stopped in the mist splash prevention case 24, and the upper side thereof. The hot water jet nozzle 31 and the lower hot water jet nozzle 32 are heated by being sprayed on both the outer surface and the inner surface. At this time, foreign matter adhering to the workpiece 90 is also washed away. Moreover, if the workpiece | work 90 is fed with a fixed pitch within the mist scattering prevention case 24, it will move to the adjacent warm water ejection part 30, and it will be similarly heated and heated in there. And after the workpiece | work 90 passes all the warm water ejection parts 30, it is arrange | positioned between the upper side air ejection nozzle 36 and the lower side air ejection nozzle 37 in the air spraying part 35, and a warm air is distributed to both an outer surface and an inner surface. Dried and dried. Thereafter, the workpiece 90 is fed at a constant pitch and waits at the end portion of the workpiece transfer device 20 outside the mist scattering prevention case 24.

  The workpiece 90 waiting at the terminal end of the workpiece conveyance device 20 is gripped and lifted by the robot hand 99 of the second conveyance robot R2 and inserted into the upper surface workpiece accommodating port 51 of the lubricant application case 50. In the lubricant application case 50, the workpiece 90 is rotated at a constant speed around the central axis together with the robot hand 99. In this state, the mist-like aqueous lubricant ejected from the lubricant spray nozzles 53 and 54 is It is applied to both the outer and inner surfaces of the workpiece 90. Then, the aqueous lubricant on the surface of the workpiece 90 is dried by the air from the drying air jet nozzle 55, and a lubricant film is formed on the surface of the workpiece 90. Then, the second transfer robot R2 removes the workpiece 90 from the lubricant application case 50, and places the workpiece 90 at a predetermined location outside. Then, the workpiece 90 is fed to the cold forging process and ironed to form a final outer race.

  As described above, according to the workpiece heating apparatus 10 of the present embodiment, the workpiece 90 is heated with warm water. Therefore, heat can be transmitted to the workpiece 90 more efficiently and quickly compared with the conventional device heated with warm air. Can do. In addition, the work 90 is not submerged in the hot water, but the hot water is ejected toward the work 90 and the hot water flows on the surface of the work 90, so that the hot water deprived of the work 90 stays around the work 90. There is no. Moreover, since warm water is also applied to the inner surface of the workpiece 90, the workpiece 90 can be rapidly heated in these respects. Further, when drying, warm air is blown into and out of the workpiece 90 by the upper air ejection nozzle 36 and the lower air ejection nozzle 37 provided in the air blowing section 35, so that the workpiece 90 can be dried quickly. . Furthermore, since a plurality of heating steps by the hot water jetting unit 30 are provided before one drying step by the air blowing unit 35, the heating time becomes longer than the drying time of the workpiece 90, and the workpiece 90 can be sufficiently heated. . In addition, since the hot water used to heat the workpiece 90 is collected and heated by the hot water supply device 40 and reused for heating the workpiece, the heat remaining in the hot water can be effectively used and environmental performance can be improved. Also excellent. Moreover, since the workpiece | work 90 is heated rapidly by the workpiece | work heating apparatus 10 as mentioned above, the waiting time of the lubricant application device 11 can be reduced or eliminated, and the operating rate of the lubricant application device 11 can be increased. Become. In addition, since the aqueous lubricant is sprayed from the direction intersecting the central axis of the work 90 in a state where the work 90 is rotationally driven, the aqueous lubricant is uniformly applied to the work 90. Thereby, the thickness of the lubricant layer formed by drying the aqueous lubricant is made uniform, and the forging quality is improved.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) Although the workpiece heating apparatus 10 and the lubricant application system 70 of the above embodiment use the outer race of the constant velocity joint as the workpiece to be heated and applied with the lubricant, if the workpiece is a cold forged product, the outer race It is not limited to racing.

  (2) Although the workpiece heating apparatus 10 of the above-described embodiment is configured to eject hot water and hot air from both the upper and lower directions toward the workpiece 90, the hot water and hot air are ejected from only above or only below the workpiece. You may make it the structure to carry out. Moreover, it is good also as a structure which ejects warm water and a hot air from the side or diagonally toward a workpiece | work.

DESCRIPTION OF SYMBOLS 10 Work heating apparatus 11 Lubricant application apparatus 20 Work conveying apparatus 21 Belt conveyor 24 Mist scattering prevention case 25 Intermediate | middle partition wall 30 Hot water ejection part 31 Upper side hot water ejection nozzle 32 Lower side hot water ejection nozzle 35 Air spraying part 36 Upper air ejection nozzle 37 Lower air jet nozzle 40 Hot water supply device 50 Lubricant application case 51 Upper surface work receiving port 52 Lubricant spray part 70 Lubricant application system 90 Work piece 91 Cylindrical part 92 Bottom wall 93 Cylindrical part 94 Slope R1 First transport robot R2 Second Transfer robot

Claims (8)

Before the water-based lubricant for cold forging is applied to the workpiece, the workpiece heating device for heating the workpiece,
A hot water jetting part that jets and heats hot water toward the workpiece;
An apparatus for heating a work, comprising: an air blowing section for blowing and drying air on the work heated by the hot water blowing section. It has a pair of belt conveyors arranged side by side with a gap, provided with a workpiece transfer device capable of placing and transferring the workpiece on the pair of belt conveyors in a state of straddling the gap,
While arranging the hot water ejection part upstream in the workpiece conveyance direction by the workpiece conveyance device, arranging the air blowing part on the downstream side,
The hot water jetting part is disposed between the pair of belt conveyors, and sandwiches the work with respect to the lower hot water jet nozzle and a lower hot water jet nozzle that jets hot water from below to the work. It is arranged at a position facing in the vertical direction, and consists of an upper hot water jet nozzle that jets hot water from above with respect to the workpiece,
The air blowing unit is disposed between the pair of belt conveyors and has a lower air jet nozzle for blowing air from below to the work, and an upper and lower side sandwiching the work with respect to the lower air jet nozzle. The work heating apparatus according to claim 1, wherein the work heating apparatus includes an upper air jet nozzle that is arranged at a position facing in a direction and blows air from above on the work.   The workpiece conveying device is configured to intermittently convey the workpiece at a constant pitch, and a plurality of the hot water ejecting portions and one air blowing portion are spaced at a certain pitch in the workpiece conveying direction. The work heating apparatus according to claim 2, wherein the work heating apparatus is arranged as follows.   A hot water recovery container disposed below the pair of belt conveyors for recovering the hot water ejected from the hot water ejection part, and the hot water collected in the hot water recovery container is heated and supplied to the hot water ejection part The work heating apparatus according to claim 2, further comprising a hot water heater. While providing the mist scattering prevention case which covers the said hot water ejection part and the said air spraying part, and the said workpiece | work of the state which received warm water or air from them, the heating area | region which accommodated the said warm water ejection part in the said mist scattering prevention case And an intermediate partition wall that is partitioned into a drying region that houses the air blowing portion,
A workpiece passage opening that allows passage of the workpiece at positions lower than the upper hot water ejection nozzle and the upper air ejection nozzle on both end walls and the intermediate partition wall in the workpiece conveyance direction in the mist scattering prevention case. Is formed through,
5. The work heating according to claim 2, wherein both ends of the pair of belt conveyors are extended to the outside of the mist scattering prevention case by a predetermined pitch or more, respectively. apparatus. The work is an outer race of a constant velocity joint, and has a structure in which a cylindrical portion protrudes from the center of the outer surface of the bottom wall of the bottomed cylindrical portion, and a chamfered slope on the outer edge of the outer surface of the bottom wall. Formed,
The work transport device is configured to be transportable in a state in which two places at the opening edge of the cylindrical portion of the work are placed on the pair of belt conveyors,
The lower hot water jet nozzle jets hot water toward the inside of the cylindrical portion of the workpiece, while the upper hot water jet nozzle is at least two locations on the chamfered slope of the workpiece and the end surface of the cylindrical portion. The workpiece heating apparatus according to any one of claims 2 to 5, wherein the workpiece heating apparatus jets out hot water from above. A lubricant application system comprising: the work heating device according to claim 1; and a lubricant application device that applies an aqueous lubricant for cold forging to the work heated and dried by the work heating device. There,
The lubricant application device is:
A lubricant application case capable of accommodating the workpiece;
An upper surface work accommodation port formed on the upper surface of the lubricant application case;
A workpiece transfer robot that holds the workpiece heated and dried by the workpiece heating device and accommodates and holds it in the lubricant application case from the upper surface workpiece storage port;
A lubricant application system comprising: a lubricant spraying unit that sprays and applies the water-based lubricant to the workpiece in the form of a mist in the lubricant application case. The workpiece transfer robot has a workpiece rotation driving unit that rotates the gripped workpiece around its central axis,
The said lubricant spraying part is arrange | positioned so that a water-based lubricant may be sprayed from the direction which cross | intersects the center axis | shaft of the workpiece | work with respect to the said workpiece | work rotated by the said workpiece | work rotation drive part. 8. The lubricant application system according to 7.

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