JP2010207872A - Method and device for applying die release agent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly cool a die by application of a die release agent so as to improve die releasability. <P>SOLUTION: When a lower die 1 and an upper die 3 are opened after forge forming, a spraying header 5 for a die release agent is set between the dies 1 and 3, and the die release agent is sprayed from each of nozzles 9a-9e and 11a-11e of the header 5 to each of portions 1a-1e of the lower die 1 and portions 3a-3e of the upper die 3, which face to the nozzles 9a-9e and 11a-11e respectively. At this time, a die release agent R2 that has medium viscosity is applied to high-temperature portions 1a, 1e, 3a, 3e of a forging face, and a die release agent R3 that has low viscosity is applied to low-temperature portions 1b, 1d, 3b, 3d of the forging face. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a release agent coating method and a release agent coating apparatus for applying a release agent to a mold for forging a forged product.

  In general, in hot forging and warm forging forming, the temperature of the mold rises because the workpiece before forging is heated to a high temperature. Therefore, a mold release agent is applied to the mold surface in order to prevent the mold releasability and lubricity of the forged product from the mold from being lowered and to cool the mold. For example, the thing of patent document 1 measures the temperature of the whole metal mold | die, and controls the injection time and injection temperature of a mold release agent based on this measured temperature.

JP-A-4-294837

  However, it is difficult to realize cooling suitable for the mold temperature only by controlling the injection time and the injection temperature of the release agent based on the measured temperature obtained by measuring the temperature of the entire mold. For example, when the mold is undercooled, the mold release agent is repelled on the mold surface, the mold release agent adhesion amount decreases, the mold release agent burns, or the mold softens due to heat. is there. On the other hand, if the mold is cooled too much, the moisture in the mold release agent will not evaporate and the amount of adhesion will decrease, resulting in a lack of coarse material due to water pools, which will cause damage to the mold due to rapid cooling.

  Therefore, an object of the present invention is to appropriately cool the mold by applying a release agent to improve lubricity and release properties.

  In the release agent application method of the present invention, a release agent having a viscosity suitable for the forging surface temperature is sprayed on the forging surface that changes in temperature by forging according to the change in the forging surface temperature, A release agent having a high viscosity is applied to a high temperature portion of the forged surface, and a release agent having a low viscosity is applied to a portion having a lower temperature.

  In the release agent coating apparatus of the present invention, temperature detecting means for detecting the forging surface temperature at each part of the mold, and mold release having a viscosity suitable for the forging surface temperature at each part detected by the temperature detecting means Release agent supply means for spraying the agent on each part, and the release agent supply means has a dedicated pipe for supplying a release agent having a different viscosity for each part.

  According to the release agent coating method of the present invention, if a release agent having a viscosity suitable for the forging surface temperature is sprayed in accordance with the change in the forging surface temperature, the release of the viscosity suitable for the forging surface temperature at that time is performed. By applying the mold, the amount of the release agent attached to the forged surface is stabilized, and the mold can be properly cooled (the mold temperature can be controlled). In particular, a high-viscosity release agent is applied to the high-temperature portion of the forged surface, and a low-viscosity release agent is applied to the lower-temperature portion. With a release agent that has a viscosity suitable for the forging surface temperature of each part of the forging surface, it is possible to maintain an appropriate amount of the release agent adhering to the applied portion, Cooling for each different part can be made appropriate. Therefore, according to the method of the present invention, the lubricity and releasability of the mold can be improved.

  According to the release agent coating apparatus of the present invention, the release agent having a viscosity suitable for the forging surface temperature of each part of the mold detected by the temperature detection means is sprayed to each part by the release agent supply means. Therefore, even in the same mold, a release agent having a viscosity suitable for the part can be applied to a part having a different temperature. In particular, since this release agent coating apparatus has a dedicated pipe for supplying a release agent having a different viscosity for each part of the mold, the forging process surface temperature is immediately adjusted to a part having a different forging process surface temperature. A release agent having a suitable viscosity can be applied.

FIG. 1 is a front cross-sectional view of the release agent coating apparatus according to the first embodiment. FIG. 2 is a side view of the forging mold applied to the release agent coating apparatus of FIG. FIG. 3 is a plan view of the forging mold shown in FIG. FIG. 4 is a front cross-sectional view corresponding to the AA cross section of FIG. 2 after the forging mold of FIG. 2 is forged. FIG. 5 is a front sectional view of the release agent coating apparatus according to the second embodiment. FIG. 6 is a front view showing a part of the release coating apparatus according to the third embodiment. FIG. 7 is a front view showing a part of the release coating apparatus according to the fourth embodiment, with partly omitted. FIG. 7A shows a high viscosity release agent applied within one cycle of forging, and FIG. 7B shows a low viscosity release. The agent application is shown. FIG. 8 is a schematic structural diagram of a release coating apparatus according to the fifth embodiment.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

“Embodiment 1”
First, after describing a release agent coating apparatus to which the present invention is applied, a method of applying a release agent using this apparatus will be described.

  FIG. 1 is a front sectional view of the release agent coating apparatus according to the first embodiment. This mold release agent coating apparatus is forged when a forging process as shown in FIGS. 2 to 4 described later is performed between a lower mold 1 and an upper mold 3 as a mold for forging a forged product. With the forged product after processing taken out from the mold, the release agent is sprayed from the release agent spraying header 5 and applied to the forging processed surfaces of the lower die 1 and the upper die 3 which have risen in temperature. Then, the lower mold 1 and the upper mold 3 are cooled to improve the releasability of the forged product after the next forging process.

  2 to 4 show a process of forging a forging 29 to be a connecting rod used in an automobile engine. 2 is a side view of the mold in a state where the mold is opened, FIG. 3 is a plan view of the lower mold in FIG. 2, and FIG. 4 corresponds to the position along line AA in FIG. It is the expanded front sectional view.

  1 is different from the mold shape shown in FIGS. 2 to 4 for easy understanding of the invention, but corresponds to the cross section taken along the line AA in FIG. 2, that is, FIG. . In FIG. 4, the same reference numerals are given to the parts corresponding to those in FIG. 1.

  Here, as shown in FIG. 2, of the recess 10 formed on the forged surface of the lower die 1 and the recess 30 formed on the forged surface of the upper die 3, The heated workpiece W is set, and the lower die 1 and the upper die 3 are brought close to each other to perform clamping, thereby forging a forging 29 to be a connecting rod as shown in FIG. At this time, burrs B are generated in the entire periphery of the forged product 29, but these burrs B are removed by post-processing. Note that the forged product 29 in FIG. 4 is not the final product (connecting rod), but, for example, the crankshaft insertion hole is post-processed in the same manner as the burr B described above.

  In such a forging process, among the forging surfaces of the lower die 1 and the upper die 3, the flat portions 31, 33 and side surfaces that serve as burrs around the portions 1a, 3a and 1e, 3e where the burrs B are generated. When the workpiece W is forged and deformed, the portions 35 and 37 are rubbed against the respective surfaces of the lower mold 1 and the upper mold 3, so that a large frictional resistance is generated and the temperature is higher than that of other portions. It becomes. The temperatures of these ends 1a, 3a and 1e, 3e are hereinafter referred to as a high temperature part.

  Further, in FIGS. 1 and 4, the central portions 1c and 3c corresponding to the I section (the portion between the large end portion and the small end portion) of the connecting rod have the rising surfaces 39 and 41 on both sides thereof. Although the workpiece W is rubbed because the vertical length is short, the frictional resistance is not so high, and the high temperature portions 1a, 3a and 1e, 3e are not as high as the above. Hereinafter, the temperature of the central portions 1c and 3c is referred to as an intermediate temperature portion.

  On the other hand, although the bottom portions 10a and 30a of the recesses 10 and 30 have side portions 35 and 37 and rising surfaces 39 and 41 on which the workpiece W is rubbed, frictional resistance of the workpiece W against the bottom portions 10a and 30a itself is small. Therefore, the temperature is lowest as compared with the high temperature portions 1a, 3a and 1e, 3e and the intermediate temperature portions 1c, 3c. Hereinafter, the temperature of the bottom portions 10a and 30a is referred to as a low temperature portion.

  Thus, the release agent spraying header 5 for spraying the release agent to the lower die 1 and the upper die 3 having a temperature difference at each part after the forging process is formed in the lower part of the nozzle body 7 in FIG. Five nozzles 9 a, 9 b, 9 c, 9 d, and 9 e for spraying the mold material toward the lower mold 1 are provided along the left and right directions in FIG. 1, respectively, and the mold release agent is directed to the upper mold 3. The nozzles 11a, 11b, 11c, 11d, and 11e are respectively provided along the left-right direction in FIG.

  Among these, the nozzles 9a, 9e and 11a, 11e at the left and right ends in FIG. 1 are respectively directed to the high temperature portions 1a, 1e and 3a, 3e, which are the hottest portions of the lower mold 1 and the upper mold 3, respectively. ing. That is, the corresponding nozzles 9a, 9e and 11a, 11e are directed toward the high temperature portions 1a, 1e and 3a, 3e, respectively.

  Further, the inner nozzles 9b, 9d and 11b, 11d adjacent to the nozzles 9a, 9e and 11a, 11e, respectively, are the low temperature portions 1b, 1d, which are the lowest temperatures in the lower mold 1 and the upper mold 3, and Directed to 3b and 3d, respectively. That is, the corresponding nozzles 9b, 9d and 11b, 11d are directed toward the low temperature portions 1b, 1d and 3b, 3d, respectively.

  Furthermore, the central nozzles 9c and 11c are intermediate temperature portions 1c and 3c that are intermediate temperatures between the high temperature portions 1a, 1e and 3a, 3e of the lower die 1 and the upper die 3 and the low temperature portions 1b, 1d and 3b, 3d. Each is oriented. That is, the corresponding nozzles 9c and 11c are directed toward the intermediate temperature portions 1c and 3c, respectively.

  Then, from the nozzles 9a, 9e and 11a, 11e at both ends, a high-viscosity (high viscosity) release agent is sprayed against the high temperature portions 1a, 1e and 3a, 3e, while the nozzles 9b, 9d and From the nozzles 11b and 11d, a low-viscosity (low-viscosity) release agent is sprayed on the low temperature parts 1b, 1d and 3b and 3d, and from the central nozzles 9c and 11c, the middle temperature parts 1c and 3c are sprayed. On the other hand, a mold release agent (medium viscosity) which is intermediate between these viscosities is sprayed.

  The viscosity control of the release agent can be changed depending on, for example, whether or not a thickener is added. If the addition amount of the thickener is increased from small to large, low viscosity, medium viscosity, and high viscosity can be obtained.

  The release agent supply means includes the release agent spraying header 5 and the release agent applicator 15 described above. As described above, the release agent spraying header 5 is provided with a plurality of nozzles 9a to 9e and 11a to 11e for spraying the release agent toward the forged surfaces of the lower die 1 and the upper die 3, respectively. . The mold release agent applicator 15 is connected to the mold release agent supply unit 17 having a pump, a check valve, and the like, and the nozzles 9a to 9e and 11a to 11e through pipes 21 (21a, 21b, 21c). Coating condition control circuit that adjusts the supply pressure, supply time, and the like when supplying each pipe 21 from a tank (not shown) containing different release agents for each of the nozzles 9a to 9e and 11a to 11e. 23.

  The pipe 21 includes a high-viscosity supply pipe 21a connected to the nozzles 9a, 9e and 11a, 11e at both ends for supplying the high temperature parts 1a, 1e and 3a, 3e, and a central nozzle for supplying the medium temperature parts 1c and 3c. A medium-viscosity supply pipe 21b connected to 9c and 11c, and a low-viscosity supply pipe 21c connected to the inner nozzles 9b, 9d and 11b, 11d to be supplied to the low temperature portions 1b, 1d and 3b, 3d. I have. That is, it is a dedicated pipe for supplying a release agent having a viscosity suitable for the forged surface temperature at each part of the mold.

  A tank containing a high viscosity release agent is connected to the high viscosity supply pipe 21a, and the high viscosity release agent is supplied from this tank. A tank containing an intermediate viscosity release agent is connected to the intermediate viscosity supply pipe 21b, and an intermediate viscosity release agent is supplied from the tank. Similarly, a tank containing a low-viscosity release agent is connected to the low-viscosity supply pipe 21c, and the low-viscosity release agent is supplied from this tank.

  Moreover, the temperature sensor 13 as a temperature detection means is each embed | buried in the metal mold | die at each site | part 1a-1e and 3a-3e of the lower mold | type 1 and the upper mold | type 3, and the forging surface temperature in each site | part Is detected. The temperature sensor 13 and the release agent applicator 15 embedded in each part are connected by a wiring 19 embedded in the lower mold 1 and the upper mold 3.

  Next, a release agent coating method for applying a release agent using the apparatus will be described. First, a heated workpiece W is set between the lower die 1 and the upper die 3, and the lower die 1 and the upper die 3 are closed and pressurized to perform forging as shown in FIG. Then, after the forging process, the release agent spraying header 5 is disposed at an intermediate position between the lower mold 1 and the upper mold 3 with the mold opened as shown in FIG.

  At this time, each temperature sensor 13 detects the forging process surface temperature of each embedded part 1a-1e and 3a-3e. The application condition control circuit 23 then selects the high-viscosity supply pipe 21a, the medium-viscosity supply pipe 21b, and the low-viscosity supply pipe 21c based on the detected forging surface temperatures of the parts 1a to 1e and 3a to 3e. A release agent having a high viscosity, a medium viscosity, and a low viscosity is supplied from a tank connected to each. At that time, the coating condition control circuit 23 controls the spraying pressure and spraying time of the release agents having different viscosities.

  As described above, the mold temperature changes for each part by heat transfer from the heated workpiece W and frictional heat with the workpiece W during forging. Since the parts 1a, 1e and 3a, 3e at both ends of the lower mold 1 and the upper mold 3 are at the highest temperature, a high-viscosity release agent R1 is sprayed and applied to these parts from the nozzles 9a, 9e and 11a, 11e. . In addition, since the intermediate portions 1c and 3c between the lower mold 1 and the upper mold 3 are intermediate temperature portions, a medium-viscosity release agent R2 is sprayed from the nozzles 9c and 11c and applied. And since the part 1b, 1d and 3b, 3d inside the both ends of the lower mold 1 and the upper mold 3 has the lowest temperature, a low-viscosity release agent R3 is applied to this part from the nozzles 9b, 9d and 11b, 11d. Spray to apply.

  That is, a high-viscosity release agent R1 is applied to a portion that becomes a high temperature portion of the forged surfaces of the lower die 1 and the upper die 3, and a middle viscosity release agent R2 is applied to a portion that becomes an intermediate temperature portion, A low-viscosity release agent R3 and a release agent having a viscosity suitable for each forging surface temperature are applied to the portions. In the high-temperature part, if a release agent with low viscosity is applied, the release agent will be repelled on the mold surface, reducing the amount of release agent adhesion, or the release agent will burn and cool the mold sufficiently. Can not be. Therefore, if a release agent having a high viscosity is applied to the high temperature part, the amount of the release agent attached to the mold surface can be maintained at an appropriate amount. Similarly, by applying a release agent having a viscosity suitable for the surface temperature of the forging process to the intermediate temperature portion and the low temperature portion, the amount of the release agent attached to the portion can be appropriately maintained.

  As described above, in the mold release agent application method of the first embodiment, a release agent having a viscosity suitable for the forging surface temperature is applied to the forging surface that changes in temperature by forging. Since it was sprayed accordingly, it was possible to prevent the amount of mold release agent from adhering to the mold due to insufficient cooling, scorching of the mold release agent on the mold surface, and softening of the mold due to high temperature, and overcooling It is possible to prevent a decrease in the amount of the release agent adhering due to insufficient evaporation of moisture in the release agent, in particular, occurrence of a lack of coarse material due to a puddle on the lower die, and damage to the die due to rapid cooling. Therefore, according to the first embodiment, the mold can be prevented from being overcooled or insufficiently cooled, the mold can be properly cooled, and the forging 29 can be improved in lubrication / release properties.

  Further, in the release agent coating method of Embodiment 1, the release agent R1 having a high viscosity is applied to a portion having a high temperature on the forged surface, and the release agent having a low viscosity is applied to a portion having a lower temperature. Since each of R2 and R3 is applied, the release agent of the applied part is provided by a release agent having a viscosity suitable for the forging process surface temperature of each part of the forging process surface that changes in temperature by forging. It is possible to maintain an appropriate amount of adhesion, and it is possible to properly cool each portion having a different forging surface temperature.

  In addition, the release agent coating apparatus of the first embodiment has a temperature sensor 13 that is a temperature detection means for detecting the forging surface temperature in each part of the mold, and the forging surface of each part detected by the temperature sensor 13. Since it has a release agent spraying header 5 and a release agent applicator 15 which are release agent supply means for spraying a release agent having a viscosity suitable for the temperature to each part, the temperature of each part of the mold Can be efficiently performed and quantitative temperature measurement by the temperature sensor 13 is possible.

  Further, in the release agent coating method of the first embodiment, a dedicated pipe for supplying a release agent having a different viscosity for each part of the mold (a high-viscosity supply pipe 21a, a medium-viscosity supply pipe 21b, and a low-viscosity supply pipe Since the pipe 21c) is provided, it is possible to immediately apply a release agent having a viscosity suitable for the forging surface temperature to portions having different forging surface temperatures.

  In the first embodiment described above, the release agents R1, R2, and R3 having viscosities suitable for the forging surface temperature of each part are prepared based on the result of temperature detection by forging in advance, but the temperature sensor 13 Based on the forging surface temperature detected in real time, the viscosity of the mold release agent is changed according to the change of the forging surface temperature depending on the presence or absence of the addition of the thickener, and the release agent with the viscosity corresponding to each part at that time May be supplied to each high-viscosity supply pipe 21a, medium-viscosity supply pipe 21b, and low-viscosity supply pipe 21c. If it carries out like this, it will become possible to control mold temperature accurately by spraying the mold release agent of the viscosity suitable for a forge process surface temperature according to the change of this forge process surface.

“Embodiment 2”
In the second embodiment, unlike the first embodiment in which a release agent having a viscosity suitable for the forging surface temperature of each part is sprayed for each part of the forging surface, the forging process is performed on the same forging surface of the mold. A release agent having an appropriate viscosity is applied according to changes in the surface temperature.

  FIG. 5 is a front sectional view of the release agent coating apparatus according to the second embodiment. In the second embodiment, a low-viscosity release agent R3 is applied to the entire forging surface of the lower die 1, and a high-viscosity release agent R1 is applied to the entire forging surface of the upper die 3. Two pipes 21 are provided, a low viscosity supply pipe 21c and a high viscosity supply pipe 21a. The low-viscosity supply pipe 21 c is connected to all the nozzles 9 a to 9 e facing the lower mold 1. The high-viscosity supply pipe 21 a is connected to all the nozzles 11 a to 11 e facing the upper mold 3.

  In Embodiment 2, when the viscosity of the release agent R1 sprayed on the upper mold 3 is made higher than the viscosity of the release agent R3 sprayed on the lower mold 1 and sprayed onto the forged surface of the upper mold 3, the upper mold 3 It is possible to prevent so-called dripping, in which the release agent hangs down to the lower mold 1 due to its own weight. At this time, if a release agent having a viscosity suitable for the forging surface temperature is applied based on the result of detecting the forging surface temperature by the temperature sensor 13, the release agent may be repelled on the die surface. It is possible to avoid the problem of being unable to complete.

“Embodiment 3”
In the third embodiment, unlike the first embodiment in which the release agents for high viscosity, medium viscosity, and low viscosity are dedicated pipes 21a, 21b, and 21cg, all the pipes 21 are made into one and the pipe 21 is connected to the pipe 21. The viscosity of the release agent to be supplied is changed by the viscosity changing means and sprayed onto the entire forged surface of the mold.

  FIG. 6 is a front view showing a part of the release coating apparatus according to the third embodiment. In FIG. 6, in order to facilitate understanding of the invention, the upper mold 3, the nozzles 11 a to 11 e that spray the mold release agent on the upper mold 3, and the mold release applicator 15 are omitted.

  A heater 40 as a heat source, which is a viscosity changing unit, is embedded in the nozzle body 7 in the vicinity of the common pipe 21. The heater 40 is disposed substantially parallel to the vicinity of the pipe 21 along the longitudinal direction of the pipe 21. By turning on the heater 40, the release agent in the pipe 21 provided in the vicinity thereof is warmed, and the water contained in the release agent evaporates to increase the viscosity.

  In addition, an air pipe 41 as a cold source that is a viscosity changing unit is provided inside the pipe 21. The air pipe 41 is provided along the longitudinal direction of the pipe 21 and air is supplied to the inside thereof. By supplying air to the air pipe 41, the release agent in the surrounding pipe 21 is cooled, and the viscosity of the release agent is lowered.

  In Embodiment 3 configured as described above, based on the forging surface temperature detected by the temperature sensor 13 provided on the mold, when the forging surface temperature is high, the heater 40 is turned on to increase the viscosity of the release agent. When the forging surface temperature is low, the viscosity is lowered by supplying air to the air pipe 41, and the middle or low viscosity release agent is sprayed. Therefore, according to the third embodiment, it is not necessary to use the dedicated pipes 21a, 21b, and 21c corresponding to the release agents having different viscosities, and the piping equipment can be simplified.

  In the third embodiment, the viscosity of the release agent can be similarly changed by eliminating the heater 40 and using a steam pipe instead of the air pipe 41. If high temperature steam is introduced into the steam pipe, the temperature and viscosity of the release agent can be controlled. In addition, at the start of production when the mold is not sufficiently warmed, the mold temperature can be stabilized at an early stage by blowing steam instead of factory air.

“Embodiment 4”
In the fourth embodiment, the viscosity of the release agent is changed within one cycle of forging from the start of forging to the end of forging.

  FIG. 7 is a front view showing a part of the release coating apparatus according to the fourth embodiment, with partly omitted. FIG. 7A shows a high viscosity release agent applied within one cycle of forging, and FIG. 7B shows a low viscosity release. The agent application is shown. In FIG. 7, in order to facilitate understanding of the invention, the upper mold 3, the nozzles 11 a to 11 e that spray the mold release agent on the upper mold 3, and the mold release applicator 15 are omitted.

  In the nozzle body 7, one pipe 21 connected to each of the nozzles 9a to 9e is provided. Then, the high-viscosity supply pipe 21a and the low-viscosity supply pipe 21c are connected to the pipe 21 at the portion protruding from the nozzle body 7. The medium viscosity supply pipe 2b may be connected to the pipe 21.

  In Embodiment 4 configured as described above, a high-viscosity release agent R1 is sprayed on the entire forged surface after mold opening, and thereafter, a low-viscosity release R3 is sprayed on the entire forged surface. The actual sprayable time within one cycle of the forging process from the start of the forging process to the end of the forging process is as short as about 1 second. For example, when a release agent is sprayed on a high-temperature mold of about 350 degrees, if the concentration of the release agent is low, it is immediately repelled on the mold surface and the release agent does not adhere to the mold surface. Therefore, by fixing the release agent to the forged surface by spraying a high-viscosity release agent R1 to form a base and spraying a low-viscosity release agent R3 thereon. By doing so, it is possible to improve the fixing failure of the release agent due to the fact that it can be sprayed only for a short time.

“Embodiment 5”
In the fifth embodiment, when the forged surface temperature rises, the release agent having a high viscosity is supplied by switching from the application of the release agent having a low viscosity.

  FIG. 8 is a schematic structural diagram of a release coating apparatus according to the fifth embodiment. In the fifth embodiment, the rough land mold 50 has a normal operation tank 52 containing a release agent R3 having a low viscosity and a mold temperature containing a release agent R1 having a higher viscosity. The use tank 53 is connected. On the other hand, only the normal operation tank 52 is connected to the finishing mold 51. The normal operation tank 52 and each nozzle in the nozzle body 7 sprayed onto the rough mold 50 and the finishing mold 51 are connected by a low-viscosity supply pipe 21c. The use tank 53 when the mold temperature rises and each nozzle in the nozzle body 7 sprayed onto the finishing mold 51 are connected by a high-viscosity supply pipe 21a.

  In order to change the workpiece W (steel) to the product (forged product 29), the rough mold 50 is processed into a product shape of about 70 to 80%, and then the remaining mold 51 is used to the remaining 30 to 20%. Process into product shape. In the rough ground mold 50 having a large amount of deformation of the workpiece W, the mold temperature is higher than that of the finishing mold 51 because the forging pressure is high. Therefore, since the mold temperature does not rise so much at the start of forging, a low-viscosity release agent R3 is sprayed from the normal operation tank 52 to the rough ground mold 50. When the temperature of the rough ground mold 50 rises by repeating forging, the release agent R1 having a high viscosity in the use tank 53 is sprayed by switching to a release agent having a different viscosity. In the finishing mold 51, since the temperature does not increase so much, it is not necessary to switch the release agents having different viscosities, and the low-viscosity release agent R3 in the normal operation tank 52 is sprayed.

  According to the fifth embodiment, the release agent having a different viscosity from the use tank 53 at the time of the mold temperature rise different from the normal operation tank 52 according to the temperature condition of the mold is set to the forging surface temperature of the mold. A release agent having an appropriate viscosity can be applied.

"Other embodiments"
In the above-described first to fifth embodiments, the temperature sensor 13 is embedded in the mold as a temperature detection means for detecting the forging surface temperature at each part of the mold, but a thermo viewer that can measure the temperature in a non-contact manner ( (Thermography) can also be used. For example, a pair of left and right thermo viewers are installed on each of the lower mold 1 and the upper mold 3, and infrared rays emitted from the mold surfaces including the respective parts 1a to 1e and 3a to 3e of the lower mold 1 and the upper mold 3 are transmitted. The intensity is detected, and the temperature distributions of these parts 1a to 1e and 3a to 3e are displayed as images on a monitor screen (not shown).

  The present invention can be used in a technique for applying a release agent to a forging die.

1 ... Lower mold (mold)
DESCRIPTION OF SYMBOLS 1a, 1e ... High temperature part of lower mold 1b, 1d ... Low temperature part of lower mold 1c ... Middle temperature part of lower mold 3 ... Upper mold (mold)
3a, 3e ... Upper mold high temperature part 3b, 3d ... Upper mold low temperature part 3c ... Upper mold intermediate temperature part 5 ... Release agent spraying header (release agent supply means)
9a to 9e, 11a to 11e ... nozzle 13 ... temperature sensor (temperature detection means)
15 ... Release agent applicator (release agent supply means)
21 ... Piping 21a ... Pipe for supplying high viscosity (dedicated piping)
21b ... Medium viscosity supply piping (dedicated piping)
21c ... Piping for supplying low viscosity (dedicated piping)

Claims (8)

In the mold release agent application method of spraying and applying a release agent from the nozzle to the forging surface of the die forging the forging,
A release agent having a viscosity suitable for the forging surface temperature is sprayed on the forging surface that changes in temperature by forging according to the change in the forging surface temperature,
A mold release agent coating method comprising: applying a release agent having a high viscosity to a high temperature portion of the forged surface, and applying a release agent having a low viscosity to a low temperature portion thereof. . The release agent coating method according to claim 1,
A method of applying a release agent, wherein the viscosity of the release agent is changed by heating. The release agent coating method according to claim 1,
A method of applying a release agent, wherein the viscosity of the release agent is changed depending on whether or not a thickener is added. A release agent coating method according to any one of claims 1 to 3, comprising:
The mold release agent coating method characterized by making the viscosity of the mold release agent sprayed on the upper mold out of the mold lower than the lower mold. A release agent coating method according to any one of claims 1 to 4, wherein:
A method for applying a release agent, wherein the viscosity of the release agent is changed within one cycle of forging from the start of forging to the end of forging. In a release agent coating apparatus that sprays and applies a release agent to the forging surface of a mold for forging a forged product,
Temperature detecting means for detecting the forging surface temperature at each part of the mold; and
A release agent supplying means for spraying a release agent having a viscosity suitable for the forging surface temperature of each part detected by the temperature detection means to each of the parts, and
The release agent supply means has a dedicated pipe for supplying a release agent having a different viscosity for each part. The release agent coating apparatus according to claim 6,
The release agent supply means includes a normal operation tank in which a release agent having a low viscosity is accommodated, and a use tank at the time of mold temperature rise in which a release agent having a higher viscosity is accommodated, and When the forged surface temperature rises, switch from a low-viscosity release agent supplied from the normal operation tank to a high-viscosity release agent in the tank used when the mold temperature rises to supply a high-viscosity release agent. A release agent coating apparatus characterized by: The release agent coating apparatus according to claim 6,
Viscosity changing means for changing the viscosity of the mold release agent is provided.

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