JP6604795B2 - Release agent applicator - Google Patents

Description

  The present invention relates to a release agent coating apparatus for applying a release agent to a molding surface of a mold.

  In general, in a die casting machine that casts an aluminum alloy or the like, a mold release agent is applied to a molding surface of a mold to cool the mold and form a film. Thereby, seizure and galling of the molten metal can be suppressed, and the mold release resistance of the molded product can be reduced.

  For example, in Patent Document 1, it is determined whether the temperature of the molding surface is in a steady state where the temperature is raised to a preset target temperature, or whether the molding surface is in an initial state where the temperature is not raised to the target temperature. In the case of the above, an oil-based mold release agent having a low external cooling property is applied to the molding surface, and in a steady state, a water release agent having a high external cooling property is applied to the molding surface. A coating apparatus is disclosed.

JP 2011-79017 A

  In a conventional release agent coating apparatus as disclosed in Patent Document 1, a release agent having a constant concentration is applied to a molding surface according to the temperature of the molding surface. However, the molding surface has a part where the temperature is high and a part where the temperature is low depending on the shape and size of the cavity. For this reason, if a low-concentration water-soluble mold release agent is applied to a part where the temperature is high, the Leidenfrost phenomenon will occur and the mold release film will not easily be formed on the mold surface, which may lead to seizure and galling is there. Conversely, when a high-concentration water-soluble release agent is applied to a low temperature part, excessive oil will adhere to the mold, leading to deterioration of product quality.

  The present invention has been made in view of the above circumstances, for each of a plurality of regions of the mold molding surface, applying a release agent of an appropriate concentration according to the temperature, suppressing seizure and galling of the mold, An object of the present invention is to provide a release agent coating apparatus capable of preventing deterioration of product quality due to excessive oil.

The release agent coating apparatus according to the first aspect of the present invention is a release agent coating apparatus that applies a release agent to a molding surface of a mold, and each section in which the molding surface of the mold is divided into a plurality of regions. A mold temperature measuring unit for measuring the temperature, a mold release agent concentration setting unit for setting the concentration of the mold release agent for each section according to the temperature of each section measured by the mold temperature measuring unit, and the mold release A release agent concentration adjusting unit that adjusts the concentration of the release agent so that the concentration is set for each section in the agent concentration setting unit, and a mold release of the concentration adjusted for each section by the release agent concentration adjusting unit A release agent application control unit that sprays the agent by moving the spray unit to the position of each section.
According to a second aspect of the present invention, there is provided a release agent coating apparatus, wherein a release agent coating apparatus applies a release agent to a molding surface of a mold, and each section obtained by dividing the molding surface of the mold into a plurality of regions. A mold temperature measuring unit for measuring the temperature, a mold release agent concentration setting unit for setting the concentration of the mold release agent for each section according to the temperature of each section measured by the mold temperature measuring unit, and the mold release A release agent application control unit that sprays the release agent having a concentration set for each section in the agent concentration setting unit by moving the spray unit to the position of each section, and the release agent concentration setting unit includes: When the temperature of the section measured by the mold temperature measuring unit is higher than the reference temperature, the concentration of the release agent is set higher than the standard concentration. When the temperature is lower than the reference temperature, the concentration of the release agent is lower than the standard concentration. Set to concentration.

  According to the present invention, it is possible to apply a release agent having an appropriate concentration according to the temperature for each region where the temperature of the mold forming surface is different, thereby suppressing seizure and galling of the mold, and excessive oil content. It is possible to prevent the product quality from being deteriorated.

Schematic configuration diagram of release agent coating device Explanatory drawing showing the internal structure of the spray unit Explanatory drawing showing the relationship between mold temperature and mold release agent concentration Release agent application control flow chart

  Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a release agent coating apparatus that injects a release agent toward the molding surfaces of a fixed mold 2 a and a movable mold 2 b of a mold 2 such as a die casting machine. Spray the release agent at a concentration suitable for the temperature. The release agent coating apparatus 1 includes a robot arm 3 having a temperature measurement unit 4 for measuring the surface temperature of each molding surface and a spray unit 5 for injecting the release agent toward the molding surface at the arm tip, and a robot. And a control device 50 that controls the arm 3 and controls the spray unit 5 based on the temperature distribution of the molding surface.

  The temperature measurement unit 4 uses, for example, a radiation thermometer that measures the temperature of an object by infrared rays (radiant energy) radiated from the object, an infrared camera using a quantum infrared imaging device having imaging sensitivity in the infrared region, and the like. Configured. The temperature measuring unit 4 is attached to the arm tip of the robot arm 3 so that the direction can be changed, and measures the temperature distribution of each section obtained by dividing the molding surfaces of the fixed mold 2a and the movable mold 2b into a plurality of regions.

  A plurality of temperature measurement units 4 may be installed at positions corresponding to the fixed mold 2a and the movable mold 2b.

  The spray unit 5 includes a nozzle 6 that locally injects a release agent on the molding surfaces of the fixed mold 2a and the movable mold 2b, and is formed as a small unit that is highly responsive to density change. Specifically, as shown in FIG. 2, the spray unit 5 is supplied with a predetermined amount of a release agent having a specified concentration and a dilution liquid for dilution from the outside. A mixer 7 is incorporated. As the release agent, for example, a wax added to silicone and diluted with water with a surfactant is used. In this embodiment, a release agent stock solution is used as a release agent having a specified concentration to be supplied to the spray unit 5. Use and supply water as diluent.

  Conventionally, the release agent is generally diluted to a set concentration by an external diluting device and supplied to the spray unit. As in the present embodiment, when the concentration of the release agent varies depending on the section, With a single dilution device, it is difficult to respond quickly to concentration changes. In contrast, the spray unit 5 of the present embodiment is supplied with a predetermined amount of the release agent stock solution and the diluent, and is mixed with the release agent stock solution and the dilution solution in the internal mixer 7 for setting. Concentration. A release agent having a set concentration is sprayed from the nozzle 6 by the pressure of air supplied from the outside. Thereby, it becomes possible to spray with good responsiveness even when the concentration of the release agent is changed while downsizing the unit.

  As will be described later, the spray unit 5 may be supplied with a release agent having a standard concentration, which will be described later, instead of the stock solution of the release agent. It is also possible to obtain a set concentration by adding a liquid (diluted water) and mixing.

  The density | concentration of the mold release agent sprayed from the spray unit 5 is individually controlled by the control apparatus 50 for every section of a metal mold | die molding surface with the density | concentration according to the temperature of the section. Therefore, the control device 50 includes a mold temperature measuring unit 51, a release agent concentration setting unit 52, a release agent concentration adjusting unit 53, and a release agent application control unit 54 as functional units related to the release agent application control. I have.

  The mold temperature measurement unit 51 divides the mold forming surface into a plurality of regions, measures the surface temperature of each section, and acquires the temperature distribution. In the present embodiment, an infrared camera is used for the temperature measurement unit 4 and a certain area is divided into a plurality of sections based on optically acquired image data, and each section is radiated from the molding surface. The average temperature of the molding surface is measured from heat rays (infrared rays), and shape data such as the concave state of the cavity of the molding surface is acquired.

  The mold release agent concentration setting unit 52 sets an optimum mold release agent concentration for each section based on the temperature (surface temperature) for each section of the mold molding surface measured by the mold temperature measurement unit 51. Specifically, the standard mold release agent concentration based on the recommended mold temperature according to the mold release agent, that is, the properties of the mold release agent, the size and shape of the molded product, the material, the temperature of the mold, etc. The proper temperature that can prevent seizure and galling by forming an appropriate release film is set as the reference temperature. When the section temperature is higher than the reference temperature, the release agent concentration is set higher than the standard concentration, and when the section temperature is lower than the reference temperature, the release agent concentration is set lower than the standard concentration.

  FIG. 3 illustrates the relationship between the mold temperature and the mold release agent concentration. In this example, the mold release agent concentration is proportional to the mold temperature centering on the reference temperature To and the standard concentration No. It has changing characteristics. The relationship of FIG. 3 may be mapped to set the mold release agent concentration from the mold temperature, but normally the map temperature and concentration axes need not be made very fine, so use a map. Alternatively, one to several levels of high and low concentrations may be set above and below the reference temperature To, respectively, and selected according to conditions.

  The release agent concentration adjusting unit 53 adjusts the amounts of the release agent and the diluent so that the release agent concentration set by the release agent concentration setting unit 52 is obtained. In the present embodiment, the ratio of the release agent stock solution and the dilution water to the set concentration is calculated, and the release agent stock solution and the dilution water at the calculated flow rate are supplied to the spray unit via a metering pump (not shown). 5 is supplied. The flow rates of the release agent stock solution and dilution water are continuously adjusted in accordance with the movement between sections of the spray unit 5 via the robot arm 3 and the concentration of each section.

  The stock solution of the release agent may be a release agent having a standard concentration corresponding to the reference temperature of the mold, and the spray unit 5 is calculated by calculating the ratio of the release agent having the standard concentration to the set concentration and the diluent. You may make it supply to.

  The release agent application controller 54 controls the position of the spray unit 5 by instructing the robot controller 60 that drives and controls the robot arm 3 via a motor or the like. The release agent application control unit 54 molds the release agent whose concentration is adjusted for each section via a flow rate adjustment unit 70 including a metering pump and valves (open / close valve, pressure adjustment valve, etc.). Control application to the surface.

  Specifically, the spray unit 5 is moved via the robot arm 3 from the captured image of the mold forming surface to each sectioned position, and the release agent stock solution having a flow rate adjusted by the release agent concentration adjusting unit 53. And the dilution water is sent to the spray unit 5. Then, a release agent mixed to a concentration corresponding to the mold temperature for each section is sprayed from the nozzle 6 by the mixer 7 of the spray unit 5 and applied to the molding surface.

  Further, the release agent application control unit 54 instructs the mold temperature measurement unit 51 to remeasure the temperature distribution of the release agent application after applying the release agent to each section. Then, a high-concentration release agent is re-applied to sections above the reference temperature, and a low-concentration release agent is re-applied to sections below the reference temperature. At this time, the concentration of the mold release agent is corrected in consideration of the shape of the mold molding surface, the spraying direction and spray speed of the mold release agent, the positional relationship of the spray unit 5 with respect to the molding surface, and the like.

  By re-applying the release agent, the temperature of the section that is still above the reference temperature can be lowered, and the mold temperature and release film can be properly maintained to prevent seizure and galling during molding. it can. In addition, in the section where the temperature is higher than the reference temperature last time, the moisture of the applied high concentration release agent is evaporated by heat, but the mold temperature is lowered, but the previously applied release agent is in a higher concentration state. It may become. Even in such cases, this time, by applying a low-concentration release agent with a large amount of water, it is possible to reduce the adhesion of excess oil due to the residue of the high-concentration release agent, and deteriorate the quality of the molded product. Can be prevented.

  The release agent application control of the control device 50 by the above function unit is executed by the program processing shown in the flowchart of FIG. Next, the program processing for the release agent application control will be described.

  In the release agent application control shown in FIG. 4, first, in the first step S1, initialization such as determination of the initial position of the spray unit 5 via the robot arm 3 and clearing of the control memory value is performed, and release in step S2. Judge the start of mold application. For example, it waits until the mold temperature stabilizes, and during that time, as a pre-processing for starting the mold release agent coating operation, a process of dividing the molding surface into a plurality of sections from a captured image of the mold molding surface is performed. It is determined whether or not the startable timing has been reached.

  If the work start timing has not been reached in step S2, the spray unit 5 is made to wait for a predetermined time in step S3. Thereafter, when the work start timing is reached, the process proceeds to step S4 to acquire the temperature (surface temperature) Tg for each section, and in step S5, the temperature Tg and the reference temperature To are compared for each section.

  As a result, when the section temperature Tg is higher than the reference temperature To (To ≦ Tg), the process proceeds from step S5 to step S6, and a release agent having a concentration higher than the standard concentration is applied to the corresponding section. To do. That is, the robot arm 3 is driven to move the spray unit 5 to the position of the corresponding section, and the flow rates of the release agent stock solution and the diluting solution are adjusted so that the concentration is higher than the standard concentration. To do.

  On the other hand, when the section temperature Tg is equal to or lower than the reference temperature To (To ≧ Tg), the process proceeds from step S5 to step S7, and a release agent having a standard concentration or a lower concentration than the standard concentration is applied to the corresponding section. To do. That is, the robot arm 3 is driven to move the spray unit 5 to the position of the corresponding section, and the flow rate of the release agent stock solution and the diluted solution is adjusted so that the concentration is lower than the standard concentration or the standard concentration. Spray from 5.

  Thereafter, in step S8, it is checked whether or not the application of the release agent has been completed for all sections. If there is a section that has not been applied, the process returns from step S8 to step S5. When the application of the release agent for all the sections is completed, the process proceeds from step S8 to step S9, the surface temperature of the mold is re-measured, and the temperature Tg for each section is re-acquired. The temperature Tg is compared with the reference temperature To.

  When the section temperature Tg is higher than the reference temperature To (To <Tg), the process proceeds from step S10 to step S11, and the mold release agent concentration for the corresponding section is corrected on the high concentration side. For example, the release agent concentration on the high concentration side corresponding to the section temperature is corrected based on the shape of the molding surface, the spray angle, the spray speed, the spray time, and the like.

  On the other hand, if the section temperature Tg is equal to or lower than the reference temperature To (To> Tg), in step S12, the release agent concentration for the corresponding section is corrected on the low concentration side. For example, the release agent concentration on the low concentration side corresponding to the section temperature is corrected based on the shape of the molding surface, the spray angle, the spray speed, the spray time, and the like.

  Then, the process proceeds from step S11 or step S12 to step S13, and the release agent having the corrected concentration is sprayed from the spray unit 5 and reapplied to the corresponding section. Thereafter, in step S14, it is checked whether or not the processing of the section to be reapplied is completed. If reapplying is not completed, the process returns to step S9 to continue the reapplying of the release agent. Is completed, the process exits from step S14.

  As described above, in this embodiment, the mold forming surface is divided into a plurality of sections, a high-concentration release agent is applied to a section higher than the reference temperature, and a low-concentration release is applied to a low-temperature section. The agent is applied. As a result, the mold can be properly cooled, and an appropriate release film can be formed on the mold surface, preventing the seizure and galling of the mold and preventing the excessive oil from adhering. It is possible to reduce defective hot water and defects in the casting cavity of the product.

  Further, since the concentration of the release agent is adjusted immediately before the spray unit 5 that sprays the release agent, the release agent concentration corresponding to the temperature of each section is changed with good responsiveness while the spray unit 5 is downsized. It is possible to improve the working efficiency.

DESCRIPTION OF SYMBOLS 1 Mold release agent coating apparatus 2 Mold 2a Fixed mold 2b Movable type 3 Robot arm 4 Temperature measurement unit 5 Spray unit 6 Nozzle 7 Mixer 50 Control device 51 Mold temperature measurement part 52 Mold release agent concentration setting part 53 Mold release agent Concentration adjustment unit 54 Release agent application control unit 60 Robot control unit 70 Flow rate control unit Tg Section-specific temperature To Reference temperature

Claims (7)

In a release agent application device that applies a release agent to the molding surface of a mold,
A mold temperature measuring unit for measuring the temperature for each section obtained by dividing the molding surface of the mold into a plurality of regions;
A mold release agent concentration setting unit for setting the concentration of the mold release agent for each section according to the temperature of each section measured by the mold temperature measurement unit;
A release agent concentration adjusting unit that adjusts the concentration of the release agent so as to be the concentration set for each section in the release agent concentration setting unit;
A mold release agent application control unit that sprays the release agent having a concentration adjusted for each section by the mold release agent concentration adjustment unit by moving a spray unit to the position of each section. Agent applicator. In a release agent application device that applies a release agent to the molding surface of a mold,
A mold temperature measuring unit for measuring the temperature for each section obtained by dividing the molding surface of the mold into a plurality of regions;
A mold release agent concentration setting unit for setting the concentration of the mold release agent for each section according to the temperature of each section measured by the mold temperature measurement unit;
A release agent application control unit that sprays the release agent having a concentration set for each section in the release agent concentration setting unit by moving the spray unit to the position of each section ;
The mold release agent concentration setting unit sets the concentration of the mold release agent to be higher than the standard concentration when the temperature of the section measured by the mold temperature measurement unit is higher than the standard temperature, and mold release when the temperature is lower than the standard temperature. concentration to set a low concentration the release agent application device you characterized than the standard concentration of the agent. The release agent concentration adjusting unit has a predetermined concentration of the release agent and a diluting solution for diluting the specified concentration of the release agent, and the respective flow rates become the concentrations set by the release agent concentration setting unit. The release agent coating apparatus according to claim 1, which is adjusted as described above. Furthermore, a release agent concentration adjusting unit for adjusting the concentration of the release agent so as to be the concentration set in the release agent concentration setting unit,
The release agent concentration adjusting unit has a predetermined concentration of the release agent and a diluting solution for diluting the specified concentration of the release agent, and the respective flow rates become the concentrations set by the release agent concentration setting unit. The release agent coating apparatus according to claim 2 , wherein the release agent coating apparatus is adjusted as follows . The said mold temperature measurement part measures surface temperature for every section divided | segmented based on the captured image of the molding surface of the said metal mold | die, The Claim 1 characterized by the above-mentioned. Release agent coating device. The mold temperature measurement unit measures the average temperature for each section with an infrared camera and acquires the shape data of the molding surface,
The said release agent application control part controls the moving speed or approach position to the applicable section of the said spray unit based on the said shape data, The any one of Claims 1-5 characterized by the above-mentioned. Release agent coating device. When there is a section having a temperature higher than the reference temperature after application of the release agent, the release agent application control unit re-applies a release agent having a concentration higher than the standard concentration, and a section having a temperature lower than the reference temperature is detected. The release agent coating apparatus according to any one of claims 1 to 6, wherein in some cases, a release agent having a concentration lower than the standard concentration is applied again.

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