JP2017080785A - Injection device of molding machine and the molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the injection device of a molding machine capable of quickly reflecting the quality concerning the gas content in a previously performed molding cycle in a subsequent molding cycle.SOLUTION: The injection device 9 of a die cast machine 1 has a drive part 16 driving a plunger 15 for pushing out a molten metal (molding material) in a sleeve 13 into a mold 101, a flow sensor 27 detecting the discharge amount of a gas from the mold 101, and a control unit 19. The control unit 19 includes a drive control part 43 controlling the drive part 16 according to a prescribed control condition in a molding cycle, and a control condition change part 45 changing the control condition in subsequent molding cycle on the basis of air volume displacement detected by the flow sensor 27 in an injection process.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an injection device for a molding machine and a molding machine. The molding machine is, for example, a die casting machine or an injection molding machine.

  In the molding machine, for example, a molding material in a molten state is supplied to a sleeve communicating with a mold, and the molding material in the sleeve is extruded (injected) into the mold to form a molded product. During the injection, if the molding material entrains gas (for example, air) in the sleeve or the like, a nest is formed in the molded product, and the quality of the molded product is deteriorated.

  Patent Document 1 discloses a technique for inspecting the quality of a molded product from the viewpoint of gas content and reflecting the inspection result in subsequent molding conditions (casting conditions). Specifically, in Patent Document 1, a CT scan is performed on a molded product to measure a nest of the molded product, and molding conditions (pressure increase time, casting pressure, high speed speed, and high speed section length) are determined based on the measurement result. It has changed.

  In addition, although it is not related with the technique which reflects the test result which concerns on gas content in molding conditions, patent document 2 is disclosing the technique which measures the discharge | emission amount of the gas discharged | emitted from a metal mold | die at the time of injection. . In Patent Document 2, this gas discharge amount is used as an index for specifying the timing for performing mold maintenance.

JP 2009-183958 A JP 2002-292694 A

  In the technique of Patent Document 1, the molded product is inspected after the molded product is taken out, and it takes time to scan the molded product. Therefore, for example, when the molding cycle is repeatedly performed, it is difficult to quickly reflect the quality related to the gas content in the previously performed molding cycle in the subsequent molding cycle (for example, the next molding cycle). is there.

  Therefore, it is preferable to provide an injection apparatus and a molding machine for a molding machine that can quickly reflect the quality of the gas content in the molding cycle performed earlier in the subsequent molding cycle.

  An injection apparatus for a molding machine according to an aspect of the present invention includes a drive unit that drives a plunger that pushes a molding material in a sleeve into a mold, a flow rate sensor that detects the amount of gas discharged from the mold, and a molding A drive control unit that controls the drive unit according to a predetermined control condition in a cycle, and a control condition change unit that changes the control condition in a subsequent molding cycle based on the displacement detected by the flow rate sensor in an injection process. And a control device.

  Preferably, the drive control unit controls the drive unit to switch the speed of the plunger to a predetermined high speed higher than before when the plunger reaches a predetermined high speed switching position in the injection step. The control condition changing unit sets the high-speed switching position in the subsequent molding cycle to a position ahead of the current position when the total amount in the injection process of the exhaust amount detected by the flow sensor is smaller than a predetermined threshold. change.

  Preferably, the control condition changing unit changes the high speed to a speed higher than the current speed when the high speed switching position is changed to a position ahead of the current position.

  Preferably, the apparatus further includes a display device for displaying an image, and the control device displays the display when a position scheduled to be set as the high-speed switching position by the control condition changing unit exceeds a predetermined limit position. A warning display control unit is provided for causing the apparatus to perform a predetermined warning display.

  An injection apparatus for a molding machine according to an aspect of the present invention includes a drive unit that drives a plunger that pushes a molding material in a sleeve into a mold, a flow rate sensor that detects the amount of gas discharged from the mold, and an image. And a drive control unit that controls the drive unit according to a predetermined control condition in the molding cycle, and a recommendation of the control condition in the subsequent molding cycle based on the displacement detected by the flow sensor in the injection process. And a control device including a recommended condition display control unit for displaying the value on the display device.

  Preferably, the drive control unit controls the drive unit to switch the speed of the plunger to a predetermined high speed higher than before when the plunger reaches a predetermined high speed switching position, and the recommended When the total amount in the injection process of the exhaust amount detected by the flow sensor is smaller than a predetermined threshold, the condition display control unit is more recommended than the current position as the recommended value for the high-speed switching position in the injection process of the subsequent molding cycle. The front position is displayed on the display device.

  Preferably, the recommended condition display control unit is higher than the current speed as the recommended value of the high speed when the display device displays a position ahead of the current position as the recommended value of the high speed switching position. The speed is displayed on the display device.

  Preferably, the control device includes a warning display control unit that causes the display device to perform a predetermined warning display when the recommended value of the high speed exceeds a predetermined limit position.

  Preferably, the apparatus further includes an input device that receives an input operation, and the control device includes an input setting unit that sets the limit position based on a signal from the input device.

  Preferably, the control device includes an automatic limit position setting unit that sets, as the limit position, a position that can secure a minimum acceleration section necessary for the speed of the plunger to reach the high speed. .

  A molding machine according to an aspect of the present invention includes a mold clamping device that clamps a mold, a machine body that includes an injection device that injects a molding material into the clamped mold, and gas discharge from the mold. A flow rate sensor for detecting the amount, a drive control unit for controlling the machine body in accordance with a predetermined control condition in a molding cycle, and the control condition in a subsequent molding cycle based on an exhaust amount detected by the flow rate sensor in an injection process. And a control device including a control condition changing unit to be changed.

  A molding machine according to an aspect of the present invention includes a mold clamping device that clamps a mold, a machine body that includes an injection device that injects a molding material into the clamped mold, and gas discharge from the mold. A flow rate sensor for detecting the amount, a display device for displaying an image, a drive control unit for controlling the machine body in accordance with a predetermined control condition in a molding cycle, and an exhaust amount detected by the flow rate sensor in an injection process; And a control device including a recommended condition display control unit that displays the recommended value of the control condition in the molding cycle on the display device.

  According to said structure, the quality which concerns on the gas content in the shaping | molding cycle performed previously can be reflected in a subsequent shaping | molding cycle rapidly.

The side view which shows the structure of the die-casting machine which concerns on embodiment of this invention. 2A is a schematic diagram showing a part of the configuration related to the control system of the die casting machine of FIG. 1, FIG. 2B is a cross-sectional view taken along the line IIb-IIb of FIG. 2A, and FIG. FIG. 2 is a schematic diagram showing an example of a configuration related to a drive unit of the die casting machine of FIG. 1. The block diagram which shows the structure of the signal processing system of the die-casting machine of FIG. The figure for demonstrating the basic operation | movement in an injection process. The figure which shows the example of the relationship between a high-speed switching position and the gas amount contained in a die-cast product. The flowchart which shows an example of the procedure of the main process which the control apparatus of the die-casting machine of FIG. 1 performs. The flowchart which shows an example of the procedure of the cycle process which the control apparatus of the die-casting machine of FIG. 1 performs. The flowchart which shows an example of the procedure of the control condition change process which the control apparatus of the die-casting machine of FIG. 1 performs.

(Die-casting machine configuration)
FIG. 1 is a side view partially including a cross-sectional view showing a configuration of a main part of a die casting machine 1 according to an embodiment of the present invention.

  The die casting machine 1 manufactures a die-cast product (molded product) by injecting a molten metal (molding material) into a mold 101 and solidifying the melt in the mold 101. The molten metal is a molten metal material. The metal is, for example, aluminum. The mold 101 includes, for example, a fixed mold 103 and a moving mold 105. In the description of the present embodiment, for convenience, the cross section of the fixed mold 103 or the movable mold 105 is shown by one type of hatching, but these molds may be of a direct engraving type or a nested type. It may be a thing.

  The die casting machine 1 includes, for example, a machine main body 3 that performs a mechanical operation for molding, and a control unit 5 that controls the operation of the machine main body 3. The machine body 3 includes, for example, a mold clamping device 7 that opens and closes and molds the mold 101, an injection device 9 that injects molten metal into the mold 101 that has been clamped, And an extrusion device 11 that extrudes from the moving mold 105 (the moving mold 105 in FIG. 1). The control unit 5 may be regarded as a part of the injection device 9 when focusing on the injection device 9 instead of the entire die casting machine 1.

  In the die-casting machine 1, the configuration other than the injection device 9 and the control unit 5 (for example, the mold clamping device 7 and the extrusion device 11) may be the same as various conventional configurations, and the description thereof is omitted. The injection device 9 and the control unit 5 may have the same basic configuration (other than the configuration related to the flow sensor described later) as well-known various configurations. The basic configurations of the injection device 9 and the control unit 5 are, for example, as follows.

  The injection device 9 includes, for example, a sleeve 13 that communicates with the mold 101, a plunger 15 that can slide within the sleeve 13, and a drive unit 16 that drives the plunger 15. In the description of the injection device 9, the mold 101 side may be referred to as the front, and the opposite side may be referred to as the rear.

  The sleeve 13 is a cylindrical member connected to the fixed mold 103, for example, and a hot water supply port 13a is opened on the upper surface. The plunger 15 includes a plunger tip 15a that can slide in the front-rear direction within the sleeve 13, and a plunger rod 15b whose tip is fixed to the plunger tip 15a. The plunger tip 15a has, for example, a substantially cylindrical shape. The plunger rod 15b has an axial shape that is smaller in diameter than the plunger tip 15a and longer than the plunger tip 15a. The rear end of the plunger rod 15 b is connected to the drive unit 16.

  When the mold 101 is clamped by the mold clamping device 7, the molten metal is poured into the sleeve 13 from the hot water supply port 13 a by a hot water supply device (not shown). Then, the plunger tip 15a slides forward in the sleeve 13 from the illustrated position, whereby the molten metal is pushed out (injected) into the mold 101. Thereafter, the molten metal solidifies in the mold 101, whereby a die-cast product is formed. The die-cast product is pushed out of the moving mold 105 by the extrusion device 11 after the mold 101 is opened by the mold clamping device 7 or simultaneously with the mold opening. This molding cycle is automatically repeated, for example.

  The control unit 5 includes, for example, a control device 19 (FIG. 2A) that performs various calculations and outputs a control command, a display device 21 that displays an image, and an input device 23 that receives an operator's input operation. And have. From another viewpoint, the control unit 5 includes a control panel (not shown) having, for example, a power supply circuit and a control circuit, and an operation unit 25 as a user interface.

  The control device 19 is provided in a control panel and an operation unit 25 (not shown), for example. The control device 19 may be appropriately divided or distributed. For example, the control device 19 includes a lower level control device for each of the mold clamping device 7, the injection device 9, and the extrusion device 11, and a higher level control device that performs control such as synchronization between the lower level control devices. May be configured.

  The display device 21 and the input device 23 are provided in the operation unit 25, for example. The operation unit 25 is provided, for example, on a fixed die plate of the mold clamping device 7. The display device 21 is configured by, for example, a touch panel including a liquid crystal display or an organic EL display. The input device 23 includes, for example, a mechanical switch and the touch panel.

  FIG. 2A is a schematic diagram showing a partial configuration relating to the control system of the die casting machine 1 (injection apparatus 9).

  The control device 19 is configured by, for example, a computer including a CPU 19a, a RAM 19b, a ROM 19c, and an external storage device 19d. A predetermined control operation is realized by the CPU 19a executing a program stored in the ROM 19c and the external storage device 19d.

  In FIG. 2A, the internal space of the mold 101 is also schematically shown. Specifically, FIG. 2A includes a perspective view of the mold 101 viewed in the mold opening / closing direction, and in this perspective view, the outer shape and the internal space of the mold 101 are indicated by solid lines. The figure may be regarded as a front view of the fixed mold 103.

  The mold 101 has a sprue 101a through which the sleeve 13 communicates, a runner 101b extending from the sprue 101a, a cavity Ca (product part) connected to the runner 101b and forming a product, and a gas (for example, air) of the cavity Ca. And a vent 101c for exhausting air.

  The sprue 101 a is formed on the fixed mold 103 of the mold 101. The runner 101b and the cavity Ca are configured between the fixed mold 103 and the moving mold 105. The opening (101e) located at the boundary between the runner 101b and the cavity Ca is a so-called gate. The gate 101e generally has the smallest cross-sectional area from the sprue 101a to the gate 101e.

  The die-casting machine 1 (in another aspect, the injection device 9) has a flow rate sensor 27 that measures the flow rate (exhaust amount) of gas (for example, air) exhausted from the vent 101c. In the injection process, basically, the molten metal is filled into the mold 101 by replacing the gas inside the mold 101 with the molten metal. Therefore, for example, by subtracting the exhaust amount in the injection process formed by the flow rate sensor 27 from the volume of the mold 101, the amount of gas contained in the molten metal (die cast product) can be calculated backward.

  The term “injection process” may refer to the period from the start of injection until the molten metal is (substantially) filled, and may include the subsequent pressure increase. In the description of the present embodiment, the term “injection process” relating to the measurement of the displacement is basically the former narrow-injection process from the above-mentioned purpose. However, after high-speed injection, which will be described later, the amount of discharge is small compared to before high-speed injection, for example, even if the measurement is completed at an appropriate time after the start of deceleration, which will be described later, before mold opening, It is thought not to be extremely large. Therefore, when a certain amount of error is allowed, the injection process related to the measurement of the exhaust amount may be taken in the meaning of the latter in a broad sense. In other words, for example, just because the measurement of the exhaust amount is completed immediately after the start of pressure increase does not necessarily violate the spirit of the embodiment of the present application.

  The flow sensor 27 may be configured by a known appropriate one. For example, the measurement method is electromagnetic, Karman vortex, impeller, float, thermal, diaphragm, ultrasonic, or Coriolis. May be. The flow sensor 27 outputs a signal corresponding to the flow rate. The signal output from the flow sensor 27 is input to the control device 19 via, for example, an appropriate amplifier 29 or the like.

  FIG. 2B is a cross-sectional view taken along the line IIb-IIb in FIG.

  Usually, the vent is configured between the fixed mold 103 and the movable mold 105 and communicates the cavity Ca with the outside of the mold 101. On the other hand, in the vent 101c of the present embodiment, for example, at least a portion (through portion 101cd) communicating with the outside of the mold 101 is on one of the fixed mold 103 and the movable mold 105 (the fixed mold 103 in the illustrated example). Is formed. Thereby, the connection between the vent 101c and the flow rate sensor 27 is facilitated.

  A portion (101 cc) on the cavity Ca side of the vent 101c is configured between the fixed mold 103 and the movable mold 105, for example, in the same manner as a normal vent. The part is constituted by, for example, a so-called chill vent in which the flow path is alternately bent in the mold opening / closing direction. A penetration part 101cd that penetrates the fixed mold 103 is formed outside the chill vent part 101cc, and the entire amount of the gas that has passed through the chill vent part 101cc is discharged from the penetration part 101cd.

  The flow sensor 27 may be provided directly with respect to the penetration part 101cd (vent 101c), or may be provided with respect to the connection flow path 31 (FIG. 2 (a)) connected to the penetration part 101cd. Good.

  Note that the position, cross-sectional area, and the like of the vent 101c may be appropriately set according to the shape and size of the cavity Ca and the like. The setting method may be the same as the conventional method except that the through-hole 101cd is provided. A plurality of vents 101c may be provided. In this case, for example, the flow sensor 27 may be provided in each vent 101c, or the single flow sensor 27 may be provided by joining the connection flow paths 31 from the plurality of vents 101c.

  FIG. 2C is a schematic diagram illustrating an example of a configuration related to the drive unit 16 of the die casting machine 1 (injection apparatus 9).

  The drive unit 16 is, for example, of a hydraulic type (hydraulic type) and includes an injection cylinder 17. The injection cylinder 17 includes a cylinder part 17a, a piston 17b that can slide on the cylinder part 17a, and a piston rod 17c that extends forward from the piston 17b and is connected to the plunger rod 15b. The inside of the cylinder portion 17a is partitioned by a piston 17b into a rear head side chamber 17h and a front rod side chamber 17r. When the hydraulic fluid is selectively supplied to the head side chamber 17h and the rod side chamber 17r, the piston 17b moves forward or backward, and as a result, the plunger 15 moves forward or backward.

  For example, hydraulic fluid is supplied from the accumulator 33 to the head side chamber 17h. As a result, the piston 17b (plunger 15) can be moved forward at a relatively high speed. The hydraulic fluid pushed out from the rod side chamber 17r as the piston 17b moves forward is discharged to the tank 35, for example.

  The speed of the piston 17b is controlled by, for example, a flow rate control valve 37 that controls the flow rate of hydraulic fluid into the head side chamber 17h and / or a flow rate control valve 39 that controls the flow rate of hydraulic fluid from the rod side chamber 17r. . That is, the speed of the plunger 15 is controlled by a meter-in circuit and / or a meter-out circuit. The flow rate control valves 37 and 39 are configured by, for example, servo valves that are incorporated in a servo mechanism and can modulate the flow rate according to an input signal, and are controlled by the control device 19.

  The die casting machine 1 (injection device 9) has a position sensor 41 that detects the position of the plunger 15 and outputs a signal corresponding to the detection result to the control device 19. The position sensor 41 comprises, for example, a scale unit (not shown) provided on the piston rod 17c and a linear encoder, and outputs a number of pulses corresponding to the amount of movement of the piston rod 17c. Thereby, the position of the plunger 15 is indirectly detected. The position sensor 41 and / or the control device 19 can specify the speed of the plunger 15 by differentiating the position (movement amount).

  FIG. 3 is a block diagram showing the configuration of the signal processing system of the die casting machine 1 (injection apparatus 9).

  As described above, the control device 19 sends control signals to the machine main body 3 (for example, the drive unit 16 of the injection device 9) and the display device 21 based on signals from the flow sensor 27, the position sensor 41, and the input device 23. Output.

  In the external storage device 19d (temporarily RAM 19b) of the control device 19, for example, control condition data D1 including information directly used for control, such as the target speed of the plunger 15, and the control condition The prescribed condition data D2 used for setting the data D1 is stored. The control condition data D1 includes, for example, information on the high speed switching position and the high speed. The prescribed condition data D2 includes, for example, information on limit positions, mold shapes, and allowable gas amounts.

  The high-speed switching position, the high-speed speed, and the limit position are information related to the speed control of the plunger 15, and will be described in detail later.

  The information on the mold shape includes, for example, information on the volume of the mold 101, the cross-sectional area of the gate 101e, and the cross-sectional area (for example, the minimum area) of the vent 101c. Information on the volume of the mold 101 can be used to estimate the amount of gas contained in the die-cast product as described above. In light of this purpose of use, the volume of the mold 101 here may include, for example, a negligible error with respect to the quality required for the die-cast product, and conversely, the die-cast product. It is possible to accurately correspond to the exhaust amount to be discharged from the vent 101c when it is assumed that no gas amount is included in the exhaust gas. Specifically, for example, the volume of the mold 101 here may be the volume of the cavity Ca alone, the volume of the entire volume in the mold 101, or the volume of the mold 101. In addition to the above, a volume including a partial volume of the sleeve 13 may be used. Such information may be input via the input device 23 or may be automatically generated from CAD data of the mold 101 or the like.

  The information on the allowable gas amount is information on the gas amount that may be included in the molded product. The allowable gas amount may be a volume under a predetermined pressure, may be a mass, or may be a ratio with respect to the volume of the mold 101. In another aspect, the allowable gas amount may be an absolute amount or may be relative to the volume of the mold 101. The allowable gas amount is arbitrarily set by an operator via the input device 23, for example.

  For convenience of explanation, various types of information are classified into a control condition (D1) and a specified condition (D2). In practice, the boundary between the two may not be clear. In other words, the information shown as the control condition in FIG. 3 may be used as the specified condition, and conversely, the information shown as the specified condition may be used as the control condition.

  In the control device 19, the CPU 19a executes a program stored in the ROM 19c and the external storage device 19d, thereby configuring a plurality of functional units responsible for control. The outline of the plurality of functional units is, for example, as follows.

  For example, the drive control unit 43 controls the drive unit 16 based on a signal from the position sensor 41 and information on the control condition data D1. The configuration (operation) of the drive control unit 43 may be the same as a known one.

  For example, the control condition changing unit 45 corrects (updates) the control condition data D1 based on a signal from the flow sensor 27. In the present embodiment, the provision of the control condition changing unit 45 is one major feature compared to the prior art.

  For example, the recommended condition display control unit 47 calculates a recommended value for information held in the control condition data D1 based on a signal from the flow sensor 27 and causes the display device 21 to display the calculation result. In the present embodiment, the provision of the recommended condition display control unit 47 is also one major feature compared to the conventional case.

  For example, the function selection unit 49 switches use / non-use of the control condition changing unit 45 and the recommended condition display control unit 47 based on a signal from the input device 23. Thereby, for example, either one of the control condition changing unit 45 and the recommended condition display control unit 47 is used, or both are not used. There may be an option that both are used.

  The input setting unit 51 sets or updates the control condition data D1 and the specified condition data D2 based on a signal from the input device 23, for example. The configuration of the input setting unit 51 may be the same as that known in the art except that information that has not been input conventionally, such as the limit position and the allowable gas amount, can be input.

  For example, instead of the input setting unit 51, the automatic limit position setting unit 53 sets the limit position based on the information of the control condition data D1 (its initial value) and / or the specified condition data D2. Note that whether the limit position is set by the input setting unit 51 or the automatic limit position setting unit 53 may be arbitrarily determined by an operator's operation on the input device 23, for example.

  For example, when some abnormality or inconvenience occurs, the warning display control unit 55 causes the display device 21 to display an image indicating that fact. The determination of abnormality or inconvenience is performed based on, for example, a comparison between the calculation result of the control condition changing unit 45 or the recommended condition display control unit 47 and the information of the specified condition data D2.

(Basic operation in the injection process)
An injection operation in the die casting machine 1 (injection apparatus 9) having the above configuration will be described.

FIG. 4 is a diagram for explaining a basic operation in the injection process. In the figure, the horizontal axis represents time t, and the vertical axis represents injection speed V and injection pressure P. In the figure, the solid line L _V shows change with time of the injection rate, the broken line L _P represents the time course of injection pressure.

For example, the injection device 9 performs low-speed injection, high-speed injection, and pressure increase (pressure increase) in order. Specifically, first, the injection device 9 advances the plunger 15 at a relatively low speed V _L in order to prevent the melt air from being caught. Then, the injection device 9, to advance the plunger 15 at a relatively fast speed V _H from the viewpoint of for filling the melt in time to solidification of the molten metal. Thereafter, the injection device 9 increases the pressure of the molten metal in the cavity by the force in the direction in which the plunger 15 advances in order to eliminate the sink of the die-cast product.

The low speed V _L and the high speed V _H are set by the input setting unit 51 based on a signal from the input device 23 (set by the operator), for example. The low speed V _L is set in a range of less than 1 m / s, for example. The high speed _VH is higher than the low speed _VL , and is set, for example, in a range of 1 m / s or more.

Switching from the low speed V _L to the high speed V _H at the time point t1 is performed, for example, when the position of the plunger 15 reaches a predetermined high speed switching position. The high-speed switching position is generally set by the input setting unit 51 based on a signal from the input device 23 (set by the operator), and is the position of the plunger 15 when the molten metal reaches the gate 101e. Set for each mold 101. In the present embodiment, one of the features is that this high-speed switching position can be suitably corrected (either manual or automatic).

The drive of the plunger 15 as described above is realized by the control of the drive unit 16 by the drive control unit 43. For example, the drive control unit 43 performs feedback control of the drive unit 16 based on the detection result of the position sensor 41 so that the speed of the plunger 15 becomes the low speed _VL held in the control condition data D1. Meanwhile, based on the detection result of the position sensor 41, the drive control unit 43 determines whether the plunger 15 has reached the high speed switching position held in the control condition data D1. Then, after the drive control unit 43 determines that the plunger 15 has reached the high-speed switching position, the high-speed speed at which the speed of the plunger 15 is held in the control condition data D1 based on the detection result of the position sensor 41. Feedback control of the drive unit 16 is performed so as to be _VH . Note that this control itself is the same as the conventional one, and the illustration of the flowchart is omitted.

(Principle of control for gas amount reduction: Correction of high-speed switching position)
FIG. 5 is a diagram showing an example of the relationship between the high-speed switching position and the amount of gas contained in the die-cast product.

  In the figure, the horizontal axis indicates the high-speed switching position, and the vertical axis indicates the amount of gas contained in the die cast product. Line L1 shows an example of a change in the amount of gas contained in the die-cast product when the high-speed switching position is changed, and line L2 shows another example of the change. “0” on the horizontal axis indicates the position of the plunger 15 when the molten metal reaches the gate 101e. The positive side of “0” is the front side of the “0” position (rear, opposite to the cavity Ca) The negative side of “0” indicates the position past the position of “0” (front, cavity Ca side).

  In the vicinity of the position “0”, the line L1 is behind the position “0”, and even if the high-speed switching position is changed, the amount of gas does not change. It shows an example in which the gas amount decreases as the value is set forward. In the line L2, the gas amount decreases as the high-speed switching position is set forward in front of the position “0”, and the gas amount decreases in front of the “0” position even if the high-speed switching position is changed. An example of no change is shown. In addition, although not shown in particular, the gas amount may decrease as the high-speed switching position is set forward before and after the “0” position.

In general, when the high-speed switching position is set forward, the amount of gas contained in the die-cast product decreases. The reason for this is, for example, that the high speed V _L is higher than the so-called critical speed and is a speed at which the gas is entrained by the molten metal, so that the entrainment of the gas increases as the high speed section becomes longer. .

  On the other hand, as already described, the amount of gas contained in the die-cast product can be estimated based on the volume of the mold 101 and the exhaust amount measured by the flow sensor 27 in the injection process. In terms of a higher level concept, the amount of gas contained in the die-cast product is correlated with the detection value of the flow sensor 27.

  Therefore, in the present embodiment, control for correcting the high-speed switching position based on the detection value of the flow sensor 27 is performed. Specifically, for example, when the estimated value of the gas amount contained in the die-cast product exceeds an allowable value (allowable gas amount), the high-speed switching position is changed forward from the current position (the high-speed section is shortened). ). Thereby, the amount of gas contained in the die-cast product can be reduced. The allowable gas amount varies depending on the type of die-cast product, and is set by, for example, the input setting unit 51 (an operator from another viewpoint).

  For example, the control condition changing unit 45 automatically corrects the high-speed switching position. Alternatively, the correction of the high-speed switching position is indicated by the recommended condition display control unit 47, and the recommended value of the high-speed switching position is indicated, and an operator who sees the recommended value changes the high-speed switching position to the input device 23. This is performed by the input setting unit 51.

  When the high speed switching position is automatically corrected by the control condition changing unit 45, for example, the correction is performed until the estimated gas amount falls below the allowable gas amount (even if the estimated gas amount approaches the ideal gas amount). May be repeated over a plurality of molding cycles. In this case, the estimated gas amount falls below the allowable gas amount as the molding cycle is repeated unless there are special circumstances such as an inappropriately large correction amount in one cycle.

  When correction is automatically performed repeatedly, the correction amount at one time of the high-speed switching position may be a constant value or a value corresponding to the difference between the estimated gas amount and the allowable gas amount (for example, proportional one) ) Or may be determined based on other parameters. The correction amount may be set by the manufacturer or may be set by the operator.

  When the recommended value display controller 47 indicates a recommended value for the high-speed switching position, for example, the recommended value is calculated according to the difference between the estimated gas amount and the allowable gas amount (which may be an ideal gas amount). This calculation may be based on a map (database) in which various values of the difference are associated with various values of the high-speed switching position, or based on a mathematical formula into which the value of the difference is substituted. It may be a thing. The map or the mathematical formula is prepared based on an experiment or the like by the manufacturer of the die casting machine 1 and stored in the control device 19, for example. The parameters whose values are referred to in order to obtain the high-speed switching position in the map or mathematical formula preferably include not only the difference in gas amount but also the volume of the mold 101, the gate area, the cross-sectional area of the vent 101c, and the like.

(High speed correction)
If the high-speed switching position is changed forward, the low speed section becomes longer and the high speed section becomes shorter, so that the time for injecting the molten metal becomes longer. As a result, for example, the filling of the molten metal into the cavity Ca is delayed in the solidification of the molten metal, and the quality may be deteriorated. Therefore, in this embodiment, with the change of the forward high-speed switching position, to change the fast speed V _H to be higher than the current speed. As a result, the shortening of the high speed section is compensated, and the molten metal can be filled without delaying the solidification of the molten metal.

  The correction of the high speed may be automatically performed by the control condition changing unit 45, similarly to the correction of the high speed switching position, or manually by the recommended condition display control unit 47 indicating the recommended value of the high speed. It may be done. However, when the high speed switching position is automatically corrected, it is preferable that the high speed is also automatically corrected. When the recommended value of the high speed switching position is indicated, it is preferable that the recommended value is also indicated for the high speed. In this case, both recommended values need not be shown in the same image.

  The corrected high speed may be calculated as appropriate. For example, the corrected high speed is calculated so that the injection time is substantially the same before and after the correction of the high speed switching position. The injection time here may be, for example, the time from the start of low-speed injection to the end of high-speed injection (deceleration start), or the time from the start of low-speed injection until the plunger stops. Also good.

Calculation method for determining the fast speed V _H for the same injection time before and after correcting the fast switching position, for example, as follows. First, the length of the low speed section before correction and the high speed section before correction based on the initial position of the plunger 15, the high speed switching position before correction, and the position when filling is complete (may be at the start of deceleration or completion of pressure increase). Specify the length. Next, with the length of the uncorrected speed section obtaining the slow speed V _L divided by and low-speed injection time, the time of high-speed injection by dividing the length of the uncorrected high speed section in uncorrected fast speed V _H Ask for. Thereby, the injection time before correction is obtained. On the other hand, the corrected low speed section length and the corrected high speed section length are specified based on the initial position of the plunger 15, the corrected high speed switching position, and the position when the filling is completed. Next, the length of the corrected low speed section is divided by the low speed _VL to obtain the corrected low speed injection time. Next, the corrected high-speed injection time is obtained by subtracting the corrected low-speed injection time from the corrected injection time. In this high-speed injection time corrected by dividing the length of the high speed section of the corrected seek fast speed V _H after correction.

  The initial position of the plunger 15 may be set by a manufacturer or may be set by an operator, for example. The position of the plunger 15 at the completion of filling or at the start of deceleration may be input by the operator to the input device 23, or may be calculated by the control device 19 from other information.

(Limit position of high-speed switching position)
From the viewpoint of gas entrainment, the high-speed switching position is more preferable at the front, but if it is too far forward, various problems occur. For example, if too fast switching position forward, can not be secured acceleration section (a section corresponding to the time from the time t1 in FIG. 4 to time point t2), the molten metal before the speed of the plunger 15 reaches the fast speed V _H Is almost completed and deceleration is started. In this case, for example, the quality of the die cast product is lowered. Therefore, in the present embodiment, a limit position is set for the forward change of the high speed switching position, and the high speed switching position is changed so that the high speed switching position does not exceed the limit position.

The limit position may be an appropriate position, may be set by the input setting unit 51 (operator), or may be automatically set by the control device 19 (automatic limit position setting unit 53). . If set automatically, limit position, for example, the speed of the plunger 15 is set to a position that ensures minimum acceleration section needed to reach the fast speed V _H. Regardless of the fast speed V _H, a fixed position may be set.

The calculation method for obtaining the limit position where the minimum acceleration section can be secured is, for example, as follows. First, the minimum acceleration time is calculated by dividing the speed difference between the high speed V _H and the low speed V _L by the maximum acceleration of the plunger 15. The maximum acceleration is stored in advance in the control device 19 (inputted by the manufacturer). Next, the maximum acceleration is integrated with the calculated acceleration time to calculate the length of the acceleration section. Then, the limit position is calculated by subtracting the acceleration section from the position of the plunger 15 at the completion of filling (may be at the start of deceleration or at the completion of pressure increase).

The speed (high-speed speed _VH or the like) used for the calculation of the limit position may be an initial value set by the input setting unit 51 (operator) or may be a corrected value. In the case of the corrected one, it may be in a cycle in which the displacement is measured, or may be set or recommended in a subsequent cycle.

(Example of flowchart)
Hereinafter, an example of a procedure of processing executed by the control device 19 in order to realize the change of the control condition as described above will be described.

  FIG. 6 is a flowchart illustrating an example of a procedure of main processing executed by the control device 19. This process is executed from the start of operation of the die casting machine 1 to the stop of operation, for example.

  In step ST1, the control device 19 determines whether or not an operation for setting molding conditions (such as control condition data D1 and specified condition data D2) has been performed on the input device 23. The control device 19 proceeds to step ST2 when determining that the setting operation has been performed, and skips step ST2 when determining that the setting operation has not been performed.

In step ST <b> 2, the control device 19 generates or updates information of the control condition data D <b> 1 and / or the specified condition data D <b> 2 according to the operation on the input device 23. Thereby, for example, the low speed V _L , the high speed V _H , the high speed switching position, and the allowable gas amount are set.

  In step ST3, the control device 19 switches the use / non-use of the function for automatically changing the control condition (control condition changing unit 45) and the function for displaying the recommended value of the control condition (recommended condition display control unit 47). Is determined for the input device 23. The control device 19 proceeds to step ST4 when determining that the switching operation has been performed, and skips step ST4 when determining that the switching operation has not been performed.

  In step ST4, the control device 19 updates information (not shown) that defines the use / nonuse of the function, which is stored in the RAM 19b or the external storage device 19d, according to the operation on the input device 23.

In step ST5, the control device 19 determines whether or not an operation for setting the limit position _PLT has been performed on the input device. When it is determined that the setting operation has been performed, the control device 19 proceeds to step ST6, and when it is determined that the setting operation has not been performed, step ST6 is skipped.

  In step ST <b> 6, the control device 19 generates or updates information on the limit position of the specified condition data D <b> 2 according to the operation on the input device 23. Thus, the limit position is an arbitrary value set by the operator.

  Note that, for the sake of convenience in clearly illustrating the characteristic portions of the embodiment, steps ST1 and ST2 and steps ST3 and ST4 are illustrated separately, or steps ST1 and ST2 and steps ST5 and ST6 are illustrated separately. However, in practice, these may be conceptualized together or executed together.

  In step ST7, the control device 19 determines whether or not an operation for instructing the input device 23 to start a molding cycle has been performed. When it is determined that the instruction operation has been performed, the control device 19 proceeds to step ST8, and when it is determined that the instruction operation has not been performed, the control device 19 returns to step ST1.

In step ST8, the control unit 19 determines whether the limit position P _LT of the control condition data D1 is set (whether step ST6 in another aspect has been performed). Then, the control device 19 proceeds to step ST9 when determining that it is not set, and skips step ST9 when determining that it is set.

In step ST9, the control device 19 sets a limit position _PLT . Specifically, for example, as already mentioned, the control device 19, the speed of the plunger 15 is set to calculate the position can be secured minimum acceleration section needed to reach the fast speed V _H. Incidentally, fast speed V _H used at this time is, for example, a set initial value in step ST1 (speed before the correction step ST46 to be described later is made).

Note that steps ST8 and ST9 may be executed only when at least one of the function for automatically changing the control condition and the function for displaying the recommended value of the control condition is selected in step ST4. Further, with respect to control conditions or specified conditions other than the limit position _PLT , it is determined whether or not a setting necessary for execution of the molding cycle has been made, and a warning display and / or automatic setting may be made as necessary.

  In step ST10, the control device 19 starts a molding cycle. Thereby, in the injection device 9, the operation described with reference to FIG. 4 is repeatedly performed.

  In step ST11, the control device 19 determines whether or not an operation for instructing the input device 23 to stop the molding cycle has been performed. When determining that the instruction operation has not been performed, the control device 19 stands by while continuing the molding cycle, and when determining that the instruction operation has been performed, the control device 19 proceeds to step ST12.

  In step ST12, the control device 19 stops the molding cycle. Then, the process returns to step ST1.

  Note that steps ST1 and ST2 and ST5 and ST6 correspond to the input setting unit 51. Steps ST3 and ST4 correspond to the function selection unit 49. Steps ST8 and ST9 correspond to the automatic limit position setting unit 53.

  FIG. 7 is a flowchart illustrating an example of a procedure of cycle processing executed by the control device 19. This process is executed for each molding cycle between steps ST10 and ST12 in FIG.

  In step ST21, the control device 19 determines whether or not the injection start condition is satisfied. The injection start condition is, for example, that the mold clamping of the mold 101 by the mold clamping device 7 is completed and the molten metal is supplied to the sleeve 13 by a hot water supply device (not shown). Then, the control device 19 waits until it is determined that the injection start condition is satisfied, and when it is determined that the injection start condition is satisfied, the process proceeds to step ST22.

  In step ST22, the control device 19 controls the drive unit 16 so as to start injection (advance of the plunger 15). This operation is as described with reference to FIG.

  In step ST23, the control device 19 starts measuring the exhaust amount by the flow sensor 27 with the start of injection. The measurement start here may be the start of signal output from the flow rate sensor 27 or the start of sampling in the control device 19 of the signal from the flow rate sensor 27 output from before. .

  Steps ST22 and ST23 are simultaneous, for example. It should be noted that an error may be allowed as appropriate, and one may be slightly more or less than the other. Further, taking into account that gas is also discharged from the hot water supply port 13a until the plunger tip 15a reaches the position where the hot water supply port 13a is closed, the measurement start timing, the measured exhaust amount, and / or the die-cast product The estimated value of the amount of gas contained may be corrected as appropriate.

  In step ST24, the control device 19 determines whether or not the filling of the molten metal into the mold 101 is completed. And the control apparatus 19 continues the measurement of exhaust_gas | exhaustion until it determines with filling with molten metal being completed, and when it determines with filling with molten metal being completed, it progresses to step ST25.

  The completion of the molten metal filling may be determined as appropriate. For example, the determination may be made based on a detection value of the position sensor 41 or based on a detection value of a pressure sensor (not shown) that can detect the injection pressure. Moreover, when made based on the detection value of the position sensor 41, for example, when the speed obtained from the detection value of the position sensor 41 becomes 0 or a predetermined speed or less, it may be determined that the filling is completed, When the position obtained from the detection value of the position sensor 41 exceeds a predetermined position, it may be determined that the filling is completed.

  In step ST25, the control device 19 ends the measurement of the exhaust amount by the flow sensor 27. Note that the end of measurement here may be the end of signal output or the end of sampling, similar to the start of measurement. By integrating the exhaust amount measured during steps ST23 to ST25, the total amount of gas discharged from the mold 101 in the injection process is measured.

  Note that the measurement of the exhaust amount in steps ST23 to ST25 is executed only when at least one of the function for automatically changing the control condition and the function for displaying the recommended value of the control condition is selected in step ST4. May be.

  In step ST26, the control device 19 determines whether or not the use of the function for changing the control condition is selected in step ST4. The control device 19 proceeds to step ST27 when it is determined that it is selected, and proceeds to step ST28 when it is determined that it is not selected.

  In step ST27, the control device 19 executes a process for automatically changing the control condition (high-speed switching position, etc.) based on the exhaust amount measured in steps ST23 to ST25. Thereafter, the control device 19 ends the process of FIG.

  In step ST28, the control device 19 determines whether or not the use of the function for displaying the recommended value of the control condition is selected in step ST4. The control device 19 proceeds to step ST29 when determining that it is selected, and ends the processing of FIG. 7 when determining that it is not selected.

  In step ST29, the control device 19 executes a process for displaying a recommended value of a control condition (such as a high-speed switching position) based on the exhaust amount measured in steps ST23 to ST25. Thereafter, the control device 19 ends the process of FIG.

  Steps ST26 and ST28 correspond to the function selection unit 49 together with steps ST3 and ST4.

  FIG. 8 is a flowchart illustrating an example of the procedure of the control condition changing process executed by the control device 19. This process is executed in step ST27 of FIG.

  In step ST41, the control device 19 estimates the gas amount contained in the die-cast product based on the measurement results of the exhaust amount in steps ST23 to ST25. As described above, this estimation is calculated by subtracting the exhaust amount (the total amount) measured in the injection process from the volume of the mold 101 and may be appropriately corrected.

  In step ST42, the control device 19 determines whether or not the estimated gas amount exceeds the allowable value (allowable gas amount) set in step ST1. Then, the control device 19 proceeds to step ST43 when determining that the allowable value is exceeded, and ends the processing of FIG. 8 when determining that the allowable value is not exceeded.

In step ST43, the control unit 19 calculates the corrected position _{P A} of the high speed switching position. Specifically, as already mentioned, a position ahead of the current position (fast switching position in the cycle where the amount of exhaust is measured) and correction position P _A. The difference between the current position and the corrected position P _A (correction amount) are as also already mentioned that may be appropriately set.

In step ST44, the calculated corrected position _{P A} is determined whether the front or not than the limit position set in step ST6 or ST9. And the control apparatus 19 progresses to step ST45, when it determines with it not being ahead, and when it determines with it being ahead, it progresses to step ST47.

In step ST45, the control unit 19 calculates the corrected velocity _{V A} of the high speed velocity _{V H.} Specifically, as already described, a speed higher than the current speed is set as the correction speed V _A.

In step ST46, the control unit 19 updates the calculated corrected position P _A and a high-speed switching position and information of a high speed rate by the calculated correction speed V _A is held in the control condition data D1 in step ST45 in step ST43.

In step ST47, i.e., the corrected position P _A at step ST44 is when it is determined to be located forward of the limit position, the controller 19 controls the display unit 21 to perform a predetermined warning display. The screen of the display device 21 includes, for example, an image including text indicating that the high-speed switching position exceeds the limit position when the high-speed switching position is corrected so that the gas amount contained in the die-cast product is less than the allowable gas amount. Is displayed.

In the case where the limit position is automatically set, step ST9 is performed immediately before step ST44 in the high speed V _H (the control condition data D1) that is currently used in the molding cycle subjected to the gas amount estimation in step ST41. May be executed using a stored value). Further, the step ST9, after step ST45, is performed using a fast speed _{V H} calculated in step ST45, determination in step ST44 may be performed in the previous step ST46.

  The recommended condition display process executed in step ST29 in FIG. 7 is substantially the same as that in FIG. However, the correction value for the high-speed switching position and the high-speed speed in the control condition changing process is a recommended value. In Step ST43, the correction amount needs to be calculated more appropriately so that the estimated gas amount is less than the allowable gas amount (or approaches the estimated gas amount). In step ST46, display of the recommended value on the display device 21 is executed instead of updating the control condition data D1 based on the correction value.

  Step ST46 corresponds to the control condition changing unit 45 (recommended condition display control unit 47 when display on the display device 21 is performed instead of updating the control condition data D1). Step ST47 corresponds to the warning display control unit 55.

  As described above, in this embodiment, the injection device 9 of the die casting machine 1 includes the drive unit 16 that drives the plunger 15 that pushes the molten metal (molding material) in the sleeve 13 into the mold 101, and the gas from the mold 101. It has a flow rate sensor 27 that detects the discharge amount of (gas) and a control device 19. The control device 19 controls the drive unit 16 in accordance with a predetermined control condition (control condition data D1) in the molding cycle, and the subsequent molding cycle based on the displacement detected by the flow sensor 27 in the injection process. A control condition changing unit 45 that changes the control conditions is included.

  Therefore, a physical quantity (exhaust volume) correlated with the gas content in the die-cast product can be obtained immediately after the completion of injection. Since the control conditions in the subsequent molding cycle are changed based on the acquired exhaust amount, the quality related to the gas content can be immediately reflected in the subsequent molding cycle (for example, the next molding cycle). As a result, for example, the inconvenience that low-quality die-cast products are mass-produced while inspecting the quality of the gas content is eliminated. Further, the exhaust amount (gas content in another viewpoint) changes even in a period shorter than the maintenance period of the mold 101, such as a change in the cross-sectional area of the vent 101 c due to thermal expansion of the mold 101. In another aspect, the quality of the die cast product changes in a relatively short period of time. The present embodiment can cope with such a change in quality.

  From another viewpoint, in the present embodiment, the injection device 9 of the die casting machine 1 includes a drive unit 16 that drives a plunger 15 that pushes the molten metal (molding material) in the sleeve 13 into the mold 101, and the mold 101. A flow rate sensor 27 for detecting the amount of gas (gas) discharged from the apparatus, a display device 21 for displaying an image, and a control device 19. The control device 19 controls the drive unit 16 in accordance with a predetermined control condition (control condition data D1) in the molding cycle, and the subsequent molding cycle based on the displacement detected by the flow sensor 27 in the injection process. A recommended condition display control unit 47 that displays a recommended value of the control condition on the display device 21 is included.

  Therefore, the operator can change the control condition based on the displayed recommended value, and whether or not it is manual or automatic, as well as the above effect, promptly determine whether the gas content is good or bad. This can be reflected in the molding cycle.

  Note that the above features may be regarded as features of the die casting machine 1 instead of the features of the injection device 9.

  That is, in this embodiment, the die casting machine 1 includes a machine main body 3 (a mold clamping device 7 and an injection device 9 and the like), a flow rate sensor 27 that detects a gas (gas) discharge amount from the mold 101, and a control device. 19. The control device 19 controls the machine body 3 in accordance with a predetermined control condition (control condition data D1) in the molding cycle, and the subsequent molding cycle based on the displacement detected by the flow sensor 27 in the injection process. A control condition changing unit 45 that changes the control conditions is included.

  From another viewpoint, the die casting machine 1 includes a machine main body 3 (a mold clamping device 7 and an injection device 9 and the like), a flow rate sensor 27 that detects a discharge amount of gas (gas) from the mold 101, and an image. A display device 21 for displaying and a control device 19 are provided. The control device 19 controls the machine body 3 in accordance with a predetermined control condition (control condition data D1) in the molding cycle, and the subsequent molding cycle based on the displacement detected by the flow sensor 27 in the injection process. A recommended condition display control unit 47 that displays the recommended value of the control condition on the display device 21 is included.

  In the above embodiment, the die casting machine 1 is an example of a molding machine. The molten metal is an example of a molding material.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  For example, the molding machine is not limited to a die casting machine, and may be an injection molding machine that molds plastic, or may be another metal molding machine. Further, the molding machine is not limited to horizontal mold clamping and horizontal injection, and may be a vertical mold and / or vertical injection. Further, the molding machine is not limited to one driven by a hydraulic device (hydraulic device), but may be one driven by an electric motor, or a hybrid type combining a hydraulic device and an electric motor. There may be.

  In the embodiment, the amount of gas contained in the molded product is estimated from the exhaust amount detected by the flow sensor, and the suitability of the control condition is determined using the estimated amount of gas. However, the displacement detected by the flow sensor may be used as it is. In any case, the processing based on the displacement detected by the flow sensor is still performed. The determination of whether or not the estimated gas amount exceeds the allowable gas amount is substantially the same as the determination of whether or not the exhaust amount detected by the flow sensor is smaller than a predetermined threshold value.

  In the embodiment, the control condition is automatically or manually changed so that the estimated gas amount is lower than the allowable gas amount. When the estimated gas amount is lower than the allowable gas amount, the control condition is not changed as no problem. However, as mentioned in the description of the embodiment, the control condition may be automatically or manually changed so that the estimated gas amount approaches the ideal gas amount. In this case, for example, when the gas amount may be relatively large, the control condition can be relaxed (the risk that the control condition becomes unnecessarily severe) can be reduced.

  Note that when the estimated gas amount is brought close to the ideal gas amount, the variation for each shot may be ignored. Therefore, when the estimated gas amount is within a predetermined range from the ideal gas amount, the control condition is not changed. May be done. Also, when approaching the ideal gas amount, if attention is paid when the estimated gas amount exceeds the ideal gas amount (or a predetermined range based thereon), the same operation as in the embodiment is performed. That is, this case is also included in the scope of the technique for determining whether or not the exhaust amount detected by the flow sensor is smaller than a predetermined threshold value.

  In the embodiment, the quality of the gas content is determined based on the total exhaust amount detected by the flow sensor in the injection process. However, values other than the total amount may be used. For example, the quality may be determined based on the peak value of the exhaust amount at the time of high-speed injection.

  In the embodiment, the aspect in which the control device has both the control condition changing unit and the recommended condition display control unit is illustrated. However, the control device may have only one of these. In the embodiment, the limit position is illustrated as being settable either manually or automatically. However, only one of the limit positions may be set. In another viewpoint, the automatic limit position setting unit may not be provided.

  In the embodiment, only the control condition of the injection device is exemplified as the control condition that is automatically or manually changed based on the displacement. However, the target control condition is not limited to the control condition of the injection device. For example, the target control condition may be a mold temperature managed in the mold clamping device. Further, when the target control condition is that of the injection apparatus, this control condition is not limited to the high speed switching position and the high speed. For example, the target control condition may be a low speed. The change of the control condition is not limited to the change of the value of the control parameter. For example, the control condition is switched between normal low-speed injection (constant speed) and so-called para-shot (speed gradually increases). May be.

  In the embodiment, the necessity of automatic or manual change of the control condition is determined for all cycles. However, such a determination may be performed once for a predetermined number of cycles. In addition, the displacement is not the measurement result of each cycle, but an average of multiple cycles (moving average) may be used.

  In the embodiment, the case where the automatic or manual change of the control condition based on the displacement is performed in a situation where the molding cycle is repeatedly performed is illustrated. However, in a situation where one molding cycle is performed every time an operation is performed by the operator, the control condition based on the displacement may be changed. In another viewpoint, the control condition may be changed based on the displacement in the trial operation.

DESCRIPTION OF SYMBOLS 1 ... Die casting machine (molding machine), 9 ... Injection apparatus, 13 ... Sleeve, 15 ... Plunger, 16 ... Drive part, 19 ... Control apparatus, 27 ... Flow sensor, 43 ... Drive control part, 45 ... Control condition change part, 47: Recommended condition display control unit, 101: Mold.

Claims (12)

A drive unit that drives a plunger that pushes the molding material in the sleeve into the mold;
A flow sensor for detecting the amount of gas discharged from the mold;
A drive control unit that controls the drive unit according to a predetermined control condition in a molding cycle; and a control condition change unit that changes the control condition in a subsequent molding cycle based on an exhaust amount detected by the flow rate sensor in an injection process. A control device,
An injection device of a molding machine having The drive control unit controls the drive unit to switch the speed of the plunger to a predetermined high speed higher than before when the plunger reaches a predetermined high speed switching position in the injection process,
The control condition changing unit changes the high-speed switching position in the subsequent molding cycle to a position ahead of the current position when the total amount in the injection process of the exhaust amount detected by the flow sensor is smaller than a predetermined threshold. The injection device for a molding machine according to claim 1. The injection device for a molding machine according to claim 2, wherein the control condition changing unit changes the high speed to a speed higher than the current speed when the high speed switching position is changed to a position ahead of the current position. . A display device for displaying an image;
The control device includes a warning display control unit that causes the display device to perform a predetermined warning display when a position scheduled to be set as the high-speed switching position by the control condition changing unit exceeds a predetermined limit position. The injection device for a molding machine according to claim 2 or 3. A drive unit that drives a plunger that pushes the molding material in the sleeve into the mold;
A flow sensor for detecting the amount of gas discharged from the mold;
A display device for displaying an image;
A drive control unit that controls the drive unit according to a predetermined control condition in a molding cycle, and a recommended value of the control condition in a subsequent molding cycle is displayed on the display device based on an exhaust amount detected by the flow rate sensor in an injection process. A control device including a recommended condition display control unit,
The injection device of the molding machine you have. The drive control unit controls the drive unit to switch the speed of the plunger to a predetermined high speed higher than before when the plunger reaches a predetermined high speed switching position;
When the total amount in the injection process of the exhaust amount detected by the flow rate sensor is smaller than a predetermined threshold, the recommended condition display control unit determines the current position as a recommended value for the high-speed switching position in the injection process of the subsequent molding cycle. The injection device for a molding machine according to claim 5, wherein a position ahead of the display device is displayed on the display device. The recommended condition display control unit displays a speed higher than the current speed as the recommended value of the high speed when the display device displays a position ahead of the current position as the recommended value of the high speed switching position. The injection device for a molding machine according to claim 6, which is displayed on an apparatus. The molding machine according to claim 6, wherein the control device includes a warning display control unit that causes the display device to display a predetermined warning when the recommended value of the high speed exceeds a predetermined limit position. Injection device. It further has an input device that accepts input operations,
The injection device for a molding machine according to claim 4 or 8, wherein the control device includes an input setting unit that sets the limit position based on a signal from the input device. The control device includes an automatic limit position setting unit that sets, as the limit position, a position at which a minimum acceleration section necessary for the plunger speed to reach the high speed can be secured. 9. An injection device for a molding machine according to 8. A machine body including a mold clamping device for clamping a mold, and an injection device for injecting a molding material into the clamped mold;
A flow sensor for detecting the amount of gas discharged from the mold;
A drive control unit that controls the machine body in accordance with a predetermined control condition in a molding cycle; and a control condition change unit that changes the control condition in a subsequent molding cycle based on an exhaust amount detected by the flow rate sensor in an injection process. A control device;
Having a molding machine. A machine body including a mold clamping device for clamping a mold, and an injection device for injecting a molding material into the clamped mold;
A flow sensor for detecting the amount of gas discharged from the mold;
A display device for displaying an image;
A drive control unit that controls the machine body according to a predetermined control condition in a molding cycle, and a recommended value of the control condition in a subsequent molding cycle is displayed on the display device based on an exhaust amount detected by the flow rate sensor in an injection process. A control device including a recommended condition display control unit,
Having a molding machine.

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