JP6984502B2 - Molding condition judgment method, molding condition judgment device and molding condition judgment program - Google Patents

Description

The present invention relates to a molding condition determination method, a molding condition determination device, and a molding condition determination program of a die casting machine.

When casting aluminum products with a die-casting machine equipped with a mold, it is necessary to consider the molding conditions (casting conditions) such as the casting capacity of the machine, the mold conditions of the mold, and the conditions of the molten metal, and set them in the die-casting machine. be. The so-called PQ ² diagram is often used for quality determination of aluminum products cast according to this molding condition.

P-Q ^2-wire diagram, for example, as shown in Patent Document 1, the vertical axis melt filling pressure: and (P metal pressure), the horizontal axis square value of a molten metal flow rate (Q ²⁾ and the on a two-dimensional coordinate plane The machine characteristic line and the mold characteristic line are drawn on the surface. Machine characteristic curve is a straight line showing the casting ability of the die casting machine to be used is expressed by ^{_{P = P 0 × (1-}} Q 2 / Q 0 2). _Here, a _{P 0 = P ACC × A C} / A S, Q 0 = V S0 × A S, P ACC accumulator pressure (injection _{accumulator), V S0} is ineffective when the injection velocity, _{A C} injection Cylinder cross-sectional area (head side) and _AS are sleeve cross-sectional areas. The mold characteristic line is a characteristic line peculiar to the mold and is represented by ^{P = B × Q 2.} Here, B = D _m / (2 × _Ag ² × C _g ² ), where D _m is the molten metal density, _Ag is the gate cross-sectional area, and C _g is the flow coefficient (paragraph [0009] of Patent Document 1). ]). Further, Q is the flow rate of the molten metal sent to the gate of the mold.

In such a PQ ² diagram, the intersection of the machine characteristic line and the mold characteristic line is called a "process point". The horizontal axis coordinate value of the process point is the square value of the molten metal flow rate (estimated value) at the time of actual casting, and the vertical axis coordinate value is the molten metal filling pressure at the time of actual casting.

Japanese Patent No. 5238247

However, conventionally, users and operators of die casting machines set target setting information including setting injection speed, target speed arrival time and target time arrival distance for test casting to examine molding conditions of a new mold (product). In some cases, or when the conventional molding conditions are changed for the purpose of improving the quality and non-defective rate of the cast product, there is a problem that it is very difficult to judge the feasibility of the molding conditions. In particular, in ^{the conventional judgment method using the PQ 2} diagram, the molten metal filling pressure during acceleration of the die casting machine is not taken into consideration, so that the judgment of the molding conditions may not be suitable for the actual casting. ..

The present invention has been made in view of the above-mentioned problems, and is a molding condition determination method and a molding condition determination device capable of determining the molding conditions indicated by the target setting information input to the die casting machine to which the mold is attached. And to provide a molding condition determination program.

In the molding condition determination method according to the present invention, the vertical axis is the molten metal filling pressure, the horizontal axis is the square value of the injection speed of the injection device of the die casting machine, the machine characteristic line based on the casting ability of the die casting machine, and the die casting machine. ^{A PV 2-} line diagram in which the mold characteristic lines of the mold to be attached to the mold are drawn is created, and the filling resistance of the mold, the acceleration resistance of the injection device, and the injection device are displayed on the PV ^{2-line diagram.} Acceleration information based on the acceleration calculated based on the weight of the movable part of the die casting machine is added, and the molding condition indicated by the target setting information input to the die casting machine is determined based on the acceleration information. It is characterized in that it outputs determination result information regarding molding conditions.

In one embodiment of the present invention, the acceleration information is a shift mold characteristic line obtained by translating the mold characteristic line on the ^{PV 2 diagram.}

In another embodiment of the present invention, the acceleration information is a filling pressure curve representing an actual casting acceleration model drawn above the mold characteristic line on the PV ^{2 diagram.}

In still another embodiment of the present invention, the target setting information includes a target injection speed of the injection device, the determination result information includes appropriate setting information satisfying the molding condition, and the appropriate setting information includes the appropriate setting information. Includes at least one of the distances and times of the high speed filling section of the actual casting injection rate to reach the target injection rate.

In still another embodiment of the present invention, the casting ability of the die casting machine and the molding conditions when the mold conditions of the mold are changed are determined and presented based on the appropriate setting information.

In the molding condition determination device according to the present invention, the vertical axis is the molten metal filling pressure, the horizontal axis is the square value of the injection speed of the injection device of the die casting machine, the machine characteristic line based on the casting ability of the die casting machine, and the die casting machine. A drawing means for calculating a mold characteristic line of a mold attached to a mold to create a PV ^2- line diagram on the work area of the storage means, and a filling resistance of the mold on the ^{PV 2-line diagram.} , Additional means for adding acceleration information based on the acceleration calculated based on the acceleration resistance of the injection device and the weight of the movable part of the injection device, and target setting information input to the die casting machine based on the acceleration information. It is characterized by including a determination means for determining the molding condition indicated by the above and an output means for outputting determination result information regarding the molding condition according to the determination result.

The molding condition determination program according to the present invention has an input procedure for inputting information on the casting ability of the die casting machine and information on the mold conditions of the mold to be attached to the die casting machine into a computer, and the vertical axis is the molten metal filling pressure. ^{Create a PV 2-} line diagram in which the machine characteristic line based on the casting ability and the mold characteristic line based on the mold condition are drawn with the horizontal axis as the square value of the injection speed of the injection device of the die casting machine. A procedure and an additional procedure for adding acceleration information based on the acceleration calculated based on the filling resistance of the mold, the acceleration resistance of the injection device, and the weight of the moving part of the injection device on the PV ^{2 diagram.} , The determination procedure for determining the molding condition indicated by the target setting information input to the die casting machine based on the acceleration information, and the output procedure for outputting the determination result information regarding the molding condition according to the determination result are executed. ..

According to the present invention, it is possible to determine the molding conditions indicated by the target setting information input to the die casting machine.

It is a partial cross-sectional side view which shows the whole structure of the die casting machine roughly. It is explanatory drawing and waveform diagram which shows the relationship of the position of the plunger chip, the state of molten metal, the injection speed, and the injection pressure in the injection filling process of a die casting machine. It is a ^{PV 2} diagram used in the molding condition determination method which concerns on one Embodiment of this invention. It is a graph which shows the relationship between speed / pressure and time in the same embodiment. It is a graph which shows the relationship between the speed and the moving distance of a plunger tip in the same embodiment. It is a ^{PV 2} diagram for demonstrating the target machine characteristic line used in the same molding condition determination method. It is a flowchart which shows the molding condition determination processing procedure by the same molding condition determination method.

Hereinafter, the molding condition determination method, the molding condition determination device, and the molding condition determination program according to the embodiment of the present invention will be described in detail with reference to the attached drawings. However, the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the means for solving the invention. ..

FIG. 1 shows a schematic configuration of a horizontal die casting machine equipped with a hydraulic injection cylinder. As shown in FIG. 1, the horizontal die casting machine 1 includes a mold device 2, an injection device 3, an operation panel 20, and a control panel 21. The mold device 2 includes a fixed mold 6 and a movable mold 7 attached between a pair of fixed platens 4 and a movable platen 5 that face each other. A mold cavity 8 including the product shape is formed between the molds 6 and 7.

The mold cavity 8 is formed by closing both platens 4 and 5 to which both molds 6 and 7 are attached by means for opening and closing a mold (not shown). The fixed platen 4 includes a tubular sleeve 9 into which a molten metal such as aluminum is poured. The sleeve 9 is arranged so as to penetrate and project from the fixed mold 6 side of the fixed platen 4 to the injection device 3 side. The internal space of the sleeve 9 penetrates the fixed mold 6 and communicates with the inside of the mold cavity 8.

On the other hand, the injection device 3 includes a hydraulic injection cylinder 10 having a piston 14 that reciprocates with respect to the mold device 2 and a device main body 15. The piston 14 is provided with a piston head on the right end side of FIG. 1, and the left end side is connected to the plunger rod 12 by an injection coupling 13.

A plunger tip 11 is attached to the left end side of the plunger rod 12, and the plunger tip 11 is fitted into the sleeve 9 from the protruding end side of the sleeve 9. The injection device 3 advances the piston 14 of the injection cylinder 10 toward the mold device 2, so that the molten metal poured into the sleeve 9 is injected and filled into the mold cavity 8.

The operation panel 20 is provided for operating the die casting machine 1. The control panel 21 houses various control devices, electronic devices, and the like for controlling the die casting machine 1. The operation panel 20 and the control panel 21 relate to an input device (not shown) including a touch panel for inputting and setting various molding conditions, input information, determination results of molding conditions, and operating conditions of the die casting machine 1. Display devices 20a and 21a for displaying information and information related to notification such as alarm / warning messages are arranged.

In the injection cylinder 10, the piston 14 is advanced by supplying pressure oil to the head chamber 16 from a hydraulic pressure supply source (not shown). After the molten metal injected and filled in the mold cavity 8 is solidified, the movable mold 7 is opened from the fixed mold 6 by the mold opening / closing means. Then, for example, the aluminum product held on the movable mold 7 side is conveyed to the outside of the mold device 2 by a product taking-out means (not shown). As a result, the aluminum product is formed by die casting.

In the die casting method, how is the injection speed until the molten metal poured (supplied) in the sleeve 9 is filled in the mold cavity 8, the subsequent injection pressure, and the timing of switching from the injection filling process to the pressure increasing process? It is extremely important for casting a good product to be able to set it appropriately.

Next, the relationship between the injection speed in the injection filling step and the injection pressure in the pressure increasing step in the method of casting an aluminum product will be described with reference to FIG. In the pouring process before the injection filling process by speed control is started, the molten metal is poured into the sleeve 9 from the opening 9a provided on the upper surface of the sleeve 9 by the pouring device (not shown), and the injection is started. It becomes a state. The tip position of the plunger tip 11 at this time is the position A.

From this state, the low-speed injection process ( _SL ) is first performed. In this low-speed injection process, control for advancing the plunger tip 11 at a stable low speed ( _VL ) is required. This is because if the plunger tip 11 is advanced at high speed in this state or is advanced in an unstable state accompanied by speed fluctuation, the molten metal is ruffled inside the sleeve 9 and air is entrained in the molten metal. This is because it causes product defects such as nests.

When the plunger tip 11 is advanced to the position B where the molten metal fills the inside of the sleeve 9 and the molten metal surface rises to the vicinity of the gate G (the inlet of the molten metal into the mold cavity 8), an injection stroke sensor (not shown) is used. This is detected by the above, and the low-speed injection process is switched to the high-speed injection process.

In the high-speed injection step (Sh), the forward speed of the plunger tip 11 is accelerated at once, and the molten metal is injected and filled in the mold cavity 8 at high speed (Vh). This is because when the molten metal comes into contact with the surface of the mold cavity 8 whose temperature is lower than that of the molten metal, the molten metal rapidly solidifies, and in order to cast a good product, the inside of the mold cavity 8 takes as short a time as possible. This is because it is desirable to complete the injection filling of the molten metal into the mold. In particular, when the aluminum product is large, has a complicated shape, or is thin and light, injection filling at a higher speed is required in the high-speed injection process.

After that, just before the inside of the mold cavity 8 is completely filled with the molten metal, the fluidity of the molten metal decreases as the cooling and solidification of the molten metal filled in each part in the mold cavity 8 progresses, and the mold cavity 8 is filled. The filling resistance of the molten metal into the 8 increases sharply. Therefore, the filling pressure (injection pressure), which is the pressure of the head chamber 16 of the injection cylinder 10, rises sharply, and the injection speed drops rapidly in response to this. Then, when the plunger tip 11 reaches the position C and the inside of the mold cavity 8 is completely filled with the molten metal, the process is switched to the next pressure increasing step (Sp) by pressure control.

Here, in the above-mentioned injection filling step, the injection speed in the high-speed injection step (Sh) is important. The high-speed injection process (Sh) is started at the position B where the surface of the molten metal rises to the vicinity of the gate G. Generally, the gate cross-sectional area orthogonal to the flow direction of the molten metal when passing through the gate G is designed to be smaller than the sleeve cross-sectional area of the inner diameter of the sleeve 9.

Therefore, the molten metal filled in the mold cavity 8 from the sleeve 9 has a reduced flow cross-sectional area when passing through the gate G, and the flow is narrowed down, so that the filling resistance (flow resistance) rapidly increases. Therefore, the injection device 3 of the die casting machine 1 has a desired target of overcoming the filling resistance when the molten metal in the sleeve 9 passes through the gate G in the high-speed filling section in the high-speed injection step (Sh). At the injection speed (Vh), the casting ability to fill the mold cavity 8 is required.

The filling resistance of the molten metal when passing through the gate G is inversely proportional to the cross-sectional area of the gate, and is proportional to the flow rate of the molten metal passing through the gate G (flow volume per unit time, hereinafter referred to as "molten metal flow rate"). do. Further, since such a gate G is an element of mold design such as a shape including the cross-sectional area of the gate, it differs for each mold (aluminum product).

For this reason, in a die casting machine that is premised on mounting various types of dies, it is difficult to present such casting ability in consideration of the filling resistance caused by the gate of the die as the specifications of the die casting machine alone. be. Therefore, in the die casting machine, the maximum injection speed that can be reproduced by so-called blank shot, etc., which does not consider the filling resistance of the molten metal, is presented as the maximum injection speed in the specifications, and is set on the operation panel of the die casting machine. Generally, the injection speed is set to an injection speed that can be reproduced by blank shot or the like without considering the filling resistance of the molten metal.

For example, when a predetermined die is attached to a predetermined die casting machine and an aluminum product is cast, the quality is judged by pre-estimation, and the molten metal filling pressure at the time of actual casting (pressure applied to the molten metal via the plunger tip of the injection device). The value of (metal pressure) and the squared value of the molten metal flow rate are required, and so-called PQ ² diagram utilizing these values is often used.

The P-Q ² line diagram, the vertical axis melt filling pressure: and (P metal pressure), the horizontal axis square value of a molten metal flow rate (Q ²⁾ and the on a two-dimensional coordinate plane, and machine characteristic line, gold It is a drawing of the type characteristic line. Machine characteristic curve is a straight line showing the casting ability of the die casting machine to be used is expressed by ^{_{P = P 0 × (1-}} Q 2 / Q 0 2). _Here, a _{P 0 = P ACC × A C} / A S, Q 0 = V S0 × A S, P ACC accumulator pressure (injection _{accumulator), V S0} is ineffective when the injection velocity, _{A C} injection Cylinder cross-sectional area (head side) and _AS are sleeve cross-sectional areas. The mold characteristic line is a characteristic line peculiar to the mold and is represented by ^{P = B × Q 2.} Here, B = D _m / (2 × _Ag ² × C _g ² ), where D _m is the molten metal density, _Ag is the gate cross-sectional area, and C _g is the flow coefficient (paragraph [0009] of Patent Document 1). ]). Further, Q is the flow rate of the molten metal sent to the gate of the mold.

In the above description of the machine characteristic line, when applied to the die casting machine 1, the pressure oil is supplied to the head chamber 16 of the injection cylinder 10, the pressure oil is discharged from the rod chamber 17 of the injection cylinder 10, and the piston 14 is used. It is premised on an injection cylinder with a structure that advances. Therefore, for example, a so-called differential circuit (runaround circuit) is configured in which the pressure oil discharged from the rod chamber 17 is merged with the pressure oil to be supplied to the head chamber 16 as it is to increase the forward speed of the piston 14. It is not premised on an injection cylinder. For differential circuit, since substantially the same back pressure as the head chamber 16 to the rod chamber 17 _{occurs, P 0 = P ACC × (} A C -A R) / A S (A R: Rod side cross-sectional area of the injection cylinder ). In such a PQ ² diagram, the intersection of the machine characteristic line and the mold characteristic line is called a "process point". The horizontal axis coordinate value of the process point is the square value of the molten metal flow rate (estimated value) at the time of actual casting, and the vertical axis coordinate value is the molten metal filling pressure at the time of actual casting.

The horizontal axis coordinate values of the process points are the molten metal flow rates that actually pass through the gate, taking into account the filling resistance caused by the gate of the mold during actual casting, and the vertical axis coordinate values correspond to this molten metal flow rate. It is an estimated value of the molten metal filling pressure (metal pressure). Filling resistance of the molten metal as it passes through the gate G is inversely proportional to the gate cross-sectional area, but that is proportional to the melt flow through the gate G has been described above, the machine characteristic line of P-Q ^2-wire diagram, It is shown based on the casting ability of the die casting machine that the molten metal filling pressure (metal pressure) decreases as the molten metal flow rate extruded from the sleeve of the die casting machine increases, and the molten metal flow rate should be the square value. Therefore, the relationship with the corresponding molten metal filling pressure can be shown by a linear function.

On the other hand, the ^{mold characteristic line in the PQ 2} diagram is a characteristic line peculiar to the mold, and the larger the flow rate of the molten metal sent to the gate of the mold, the more the molten metal is filled due to the filling resistance of the molten metal when passing through the gate. It is shown that the pressure increases based on the data at the time of actual casting performed with the mold attached to the die casting machine. For example, if the melt flow rate fed to the gate of the mold if the Q, Q is the V _S and the sleeve cross-sectional area A _S (forward speed of the plunger tip 11) actual casting injection speed of the injection apparatus 3 at the time of actual casting product, i.e., can be expressed by Q = _{V S} × _{A S.} Also, by setting the molten metal flow rate to the square value, the relationship with the corresponding molten metal filling pressure can be shown by a linear function.

In the following description, will be described with reference to P-V ^2-wire diagram in place of the P-Q ² line diagram, it is also possible to use a P-Q ² line view. Further, in the conventional ^{molding condition determination method using the PQ 2-} line diagram, the situation during acceleration has not been examined, but in the present embodiment, acceleration immediately after switching to the high-speed injection process (Sh). Judgment is made in consideration of the state inside.

The molding condition determination method according to the embodiment of the present invention is premised on the casting method of an aluminum product using the horizontal die casting machine 1 described above. ^{Regarding the PV 2} diagram, the machine characteristic line M, the mold characteristic line D, the filling pressure curve PC, the shift mold characteristic line SD, and the target machine characteristic line TM used in the molding condition determination method according to the present embodiment. This will be described with reference to the ^{PV 2} diagram of FIG. 3 developed in the molding condition determination device provided in the die casting machine 1.

As shown in FIG. 3, in the PV ² diagram, the vertical axis is the molten metal filling pressure (metal pressure: MPa), and the horizontal axis is the injection speed in the injection device 3 of the die casting machine 1 (advance speed of the plunger chip 11). The squared value of ((m / s) ² ). The difference from the conventional PQ ^2- line diagram is that the horizontal axis is not the squared value of the molten metal flow rate (Q) but the squared value of the injection speed.

Machine characteristic line M drawn on the ^{P-V 2-wire} diagram, previously-described ^{P-Q 2-wire} diagram of the machine characteristic line ^{_{(P = P 0 × (1}} -Q 2 / Q 0 2)) in the the melt flow rate Q and Q _0, is obtained by replacing the product of the sleeve cross-sectional area a _S of the sleeve 9 of the injection device 3 and the injection speed. That is, in the equation, by substituting Q = _{V S} × _{A S} and _{Q 0 = V S0 × A S} , the machine characteristic line M ^{_{is, P = P 0 × (1}} -V S 2 / V S0 2) and , It becomes a linear function including the squared value of the injection speed, and can be drawn on the PV ^{2-line diagram.}

Incidentally, V _S, it is as previously described is actual casting injection speed of the injection apparatus 3 at the time of actual casting. The actual casting injection speed V _S is a numerical value to the die casting machine 1, in a state attached and fixed die 6 and the movable mold 7, obtained by performing the actual casting under the set conditions of the V _S0 as set injection speed Is.

Further, _VS0 is the maximum set injection speed obtained by performing a blank shot without using a molten metal. All other figures _{(P 0, A C, A} S) is a numerical value obtained from the characteristics of the specifications of the die casting machine 1 (fixed value), render the machine characteristic line M on P-V ^2-wire diagram There are no particular difficulties with this.

On the other hand, the die characteristic line D drawn on the P-V ^2-wire diagram, molten metal flow rate in relation to the mold characteristic line P-Q ² line diagram described previously (P = B × Q ²⁾ the Q, is obtained by replacing the product of the sleeve cross-sectional area a _S of the sleeve 9 of the injection device 3 and the injection speed. That is, in the equation, by substituting Q = _{V S} × _{A S,} mold characteristic line D, the ^{_{P = B × V S 2 ×}} A S 2, becomes a linear function including square value of the injection speed, P -V Can be drawn on a ^{2-line diagram.}

In addition, B (B = D _m / (2 × _Ag ² × C _g ² _{)) includes D m} (melt density) and C _g (flow coefficient) which are not fixed values. The molten metal density D _m and the flow coefficient C _g change with the progress of solidification of the molten metal in the injection filling step, but the amount of change is small and greatly affects the inclination of the mold characteristic line D as a linear function. is not it.

Therefore, for the molten metal density D _m and the flow coefficient C _g , the mold characteristic line D is drawn by appropriately adopting an intermediate value of the amount of change in the injection filling process or a value that is empirically suitable as a fixed value. Therefore, there is no particular difficulty in drawing the mold characteristic line D on the ^{PV 2-line diagram.}

The machine characteristic line M reflects the casting ability of the die casting machine 1 and its inclination can be changed by changing the set injection speed or the molten metal filling pressure. Machine characteristic line M shown, for example, a state that does not take into account the filling resistance of the molten metal (molten metal filling pressure P = 0), is reflected in the equation ^{_{P = P 0 × (1-}} V S 2 / V S0 2) and shows the results of the actual casting injection speed V _{S =} V _S0 state, i.e., is equal to the reproducible maximum set injection speed and actual casting injection speed at idle driving or the like in this embodiment, the machine characteristic line M The intersection point (intercept value) _VS0 between the die casting machine 1 and the horizontal axis indicates the squared value of the maximum set injection speed in the specifications of the die casting machine 1.

^{The intersection (process point) PP of the machine characteristic line M and the mold characteristic line D on the PV 2} diagram represents the maximum setting injection speed VM of the die casting machine 1 in the design at the time of actual casting in which the mold is mounted. At this process point PP, the filling resistance of the mold and the filling pressure of the die casting machine 1 are equal to each other, so that the injection device 3 does not accelerate. Therefore, injection filling cannot be performed at a higher speed and in a shorter time.

On the other hand, in die casting, in order to ensure the quality of the cast product, it is better that the filling time in the injection process is as short as possible. Further, the moving distance of the plunger tip 11 in the injection process should be as long as possible. In order to shorten the filling time or increase the moving distance, it is necessary to increase the target injection speed Vh in the high-speed injection step Sh. In die casting, as described above, the injection speed is changed from low speed to high speed to low speed, but the "filling time" and "moving distance" here mean the speed from low speed to low speed again. Is defined as the length of time when the head falls (the time length Tsh of the high-speed injection process Sh in FIG. 4) and the moving distance of the plunger chip 11 (the distance Lsh of the high-speed injection process Sh in FIG. 5). Therefore, the filling time Tsh and the moving distance Lsh are determined by the magnitude of the target injection speed Vh in the high-speed injection process Sh and the magnitude of the acceleration a until the target injection speed Vh is accelerated and the speed is reduced to a low speed. In other words, in order to shorten the filling time Tsh or to lengthen the moving distance Lsh, it is necessary to (1) increase the target injection speed Vh and (2) increase the acceleration a of acceleration (deceleration). be.

Therefore, in die casting, when considering the molding conditions, whether the filling time Tsh is shorter than the target time or the moving distance Lsh is the target in consideration of the acceleration a in the high-speed injection process Sh. You need to check if it is longer than the distance. However, even if you want to consider whether the filling time is shorter than the target time or the moving distance is longer than the target distance in consideration of the acceleration a, in advance examination of molding conditions or confirmation at the site. It is difficult to study using a conventional PQ ^2- line diagram (or PV ^{2-line diagram).} To calculate this, the weight of the object to be cast (calculated from the volume of aluminum on the gate of the mold), the weight of the moving part, the diameter of the tip, the length of the high speed section, the high speed, the acceleration of the injection device and It is necessary to investigate the deceleration characteristics, create an equation of motion, and simulate it.

The acceleration performance of the injection device of the die casting machine can be estimated from the size of the region surrounded by the machine characteristic line M and the mold characteristic line D in the PV ^{2 diagram.} The magnitude of acceleration when accelerating to high speed is obtained by dividing the excess filling force (surplus power) F of the filling force shown between the mold characteristic line D and the machine characteristic line M by the mass m of the moving part of the injection device 3. Then, the maximum acceleration a can be obtained from the equation of motion. In general, since the machine characteristic line M has a characteristic of declining to the right, the margin of the filling force decreases proportionally as the actual casting injection speed Vs increases, so that the acceleration cannot be maintained as the speed increases.

The process point PP at the intersection of the machine characteristic line M and the mold characteristic line D indicates that this acceleration becomes zero and becomes the theoretical maximum velocity of the mold. The surplus filling force F for maintaining a specific acceleration can be calculated from the equation of motion (F = m · a) by multiplying the mass m of the piston 14 or the plunger rod 12 of the injection device 3 by the desired acceleration a. When this excess filling force F is set as the target value Fs and described in parallel to the mold characteristic line D on the upper side of the mold characteristic line D as shown in FIG. 3, the line maintains the target acceleration a. It becomes the line of the filling force required for. This line is called the "shift mold characteristic line SD". This "shift mold characteristic line SD" is an example of "acceleration information" in the present invention. How much the shift mold characteristic line SD can be shifted from the mold characteristic line D can be easily grasped from the PV ^{2 diagram.} The process point PM at which the shift mold characteristic line SD intersects the machine characteristic line M has a maximum speed V2 capable of maintaining the acceleration a. By drawing in this way, the maximum acceleration a for each mold can be easily grasped. Then, when the maximum acceleration a and the maximum speed V2 are obtained, the filling time Tsh or the moving distance Lsh is obtained.

Next, the simulation result of the change in the molten metal filling pressure due to the actual acceleration will be described. Now, when the speed of the injection device 3 is constant, that is, when the acceleration is zero, the molten metal filling pressure overlaps with the mold characteristic line D, but when the injection device 3 is actually accelerating in the high-speed injection process. Requires acceleration to accelerate injection filling. Therefore, the molten metal filling pressure including the acceleration a exceeds the mold characteristic line D and appears on the upper side thereof. Figure 4 is a low-speed injection step (S _L), is a graph showing temporal changes of the high-speed injection step (Sh) and injection speed V and an injection pressure leading to the pressure increase step (Sp) (melt filling pressure) P. During the initial acceleration period of the high-speed injection process (Sh), the molten metal filling pressure corresponding to the magnitude of the acceleration is generated. As shown in FIG. 3, the molten metal filling pressure draws a curve on the upper side of the mold characteristic line D. This curve is called a "filling pressure curve PC". This "filling pressure curve PC" is also another example of "acceleration information" in the present invention.

In the filling pressure curve PC, when the firing output of the injection device 3 is f1, the filling resistance (f2) of the mold shown by the mold characteristic line D and the acceleration resistance of the injection device 3 (acceleration force: F = f1-f2). And the need calculated by the equation of motion (F = m · a) based on the weight (m) of the moving parts (eg, cast parts such as piston 14, injection coupling 13, plunger rod 12, and plunger tip 11). The actual casting acceleration model based on the acceleration (a) is represented. The filling pressure curve PC is drawn between the mold characteristic line D and the shift mold characteristic line SD.

In actual casting, the filling pressure curve PC is at a speed lower than the maximum set injection speed VM of the mold represented by the process point PP of the machine characteristic line M and the mold characteristic line D on the PV ^{2 diagram.} , Indicates that the maximum acceleration speed that can be reached while maintaining a predetermined acceleration will come. That is, the acceleration of the injection device 3 is taken into consideration when there is a filling resistance of the molten metal due to the gate G of the mold with respect to the set injection speed in the specifications of the die casting machine 1 which does not consider the filling resistance of the molten metal. It is possible to determine how fast the maximum actual casting injection speed (maximum actual casting injection speed) is.

As a result, in the die casting machine 1, the molding conditions indicated by the target setting information (target injection speed, target injection time, etc.) input to the die casting machine 1 based on the filling pressure curve PC are as close as possible to the actual casting. It becomes possible to judge. Further, it is also possible to output the determination result information regarding the molding conditions according to the determination result.

The determination result information can be used for determining whether or not short-time filling is possible in the actual high-speed injection process, which depends on the molding conditions, and for calculating the maximum actual casting injection speed that can maintain a high molten metal filling pressure. The determination result information includes, for example, appropriate setting information (set injection speed, set injection time, etc.) that satisfies the molding conditions, and the appropriate setting information is, for example, the high-speed filling section in the high-speed injection process of the actual casting injection speed that reaches the target injection speed. Includes at least one of distance and time.

The shift mold characteristic line SD can also be drawn on the PV ^2- line diagram based on the filling pressure curve PC. In this case, the shift mold characteristic line SD has the required acceleration force obtained by the filling pressure curve PC, that is, the acceleration force (F) calculated from the required acceleration a and the weight (m) of the movable part of the injection device 3. Accordingly, the mold characteristic line D is moved in parallel along the vertical axis. Specifically, the point (vertical section value) b representing the maximum molten metal filling pressure in the broken line portion of the filling pressure curve PC and the intersection point (vertical section value) between the injection speed V1 and the mold characteristic line D at this time. With the acceleration force (F) obtained by c as the shift amount, the mold characteristic line D is moved in parallel along the vertical axis without passing through the origin 0. The shift amount increases as the acceleration increases.

Then, the maximum acceleration speed (process point) PM at which the intersection (process point) PM between the shift mold characteristic line SD and the machine characteristic line M can maintain the target acceleration represented by the filling pressure curve PC including the broken line portion ( Horizontal axis intercept value) represents V2. Therefore, it can be easily grasped that there is an injection speed that can be reached while maintaining a predetermined acceleration a at a speed lower than the maximum set injection speed of the mold represented by the process point PP.

Since the filling pressure curve PC exceeds the machine characteristic line M in the vicinity of the point PM, it exceeds the capacity of the injection device 3. Therefore, in reality, it is necessary to control the acceleration along the broken line portion of the filling pressure curve PC drawn below the machine characteristic line M.

When the acceleration is controlled by the filling pressure curve PC shown by the solid line, it is necessary to use the injection device 3 having the ability along the target machine characteristic line TM in which the machine characteristic line M is shifted upward as shown in FIG. be. The target machine characteristic line TM is arranged above the filling pressure peak point d of the filling pressure curve PC, and each numerical value obtained from the characteristic characteristics of the die casting machine 1 is set to the filling pressure curve PC and the shift mold. It is calculated and drawn based on the characteristic line SD or the like.

This target machine characteristic line TM is particularly high even in a high-speed injection process because it has a sufficient molten metal filling pressure even when a mold with mold conditions represented by the shift mold characteristic line SD is attached. It shows the casting ability (output characteristic) of the die casting machine 1 capable of continuously accelerating the injection device 3 by acceleration for casting.

Therefore, for example, as shown in FIG. 6, ^{in the die casting machine 1 in which the mold characteristic line D1 and the machine characteristic line M are drawn on the PV 2} diagram, the mold has a high filling pressure peak. When the line D2 is replaced with one showing the characteristics, the target machine characteristic line TM having a sufficient molten metal filling pressure is drawn above the filling pressure peak point by considering the filling pressure curve PC. Therefore, it is possible to easily grasp the output characteristics of the machine capable of performing injection filling while maintaining high acceleration.

^{By creating a PV 2-} line diagram in which these shift mold characteristic lines SD and target machine characteristic lines TM are drawn together with the filling pressure curve PC, the predetermined mold and die casting machine can set the molding conditions according to the target setting information. Whether or not it can be satisfied, whether or not the mold conditions of the mold or the output characteristics of the die casting machine 1 are appropriate, etc. are easily determined in more detail and over a wide range, and the determination result information is output. Is possible.

In this way, the machine characteristic line M, the mold characteristic line D, and the filling pressure curve PC are drawn on the PV ^{2 diagram, and the shift mold characteristic line SD and the target machine characteristic line TM are further drawn.} This makes it possible to easily determine whether or not the molding conditions indicated by the input target setting information can be realized based on the casting capacity of the die casting machine 1 and the mold conditions of the mold. Further, the output characteristics and the mold conditions according to the molding conditions, or the output characteristics and the mold conditions required to satisfy the molding conditions can be easily determined.

As described above, the machine characteristic line M, the mold characteristic line D, the filling pressure curve PC, the shift mold characteristic line SD, and the target machine characteristic line TM are drawn on the PV ^{2-line diagram.} There is no particular difficulty. Therefore, the specification data of the machine and the mold input to the storage unit of the control device (not shown) housed in the control panel 21 of the die casting machine 1, the experimental data obtained by the test casting, and the like are utilized. ^{, A PV 2-} line diagram in which the machine characteristic line M and the mold characteristic line D for each mold (aluminum product) are drawn on the PV ^2- line diagram is created and stored on the work area of this storage unit. Let me.

The stored PV ^2- line diagram is, if necessary, on the display screens (touch panel, etc.) of the operation panel 20 of the die casting machine 1 and the display devices 20a, 21a of the control panel 21, which are examples of the molding condition presenting means. It may be displayed. In this case, various information may be displayed as numerical values on the display screen, may be displayed blinking, or the determination result information may be displayed as a message stored in advance according to the determination of the molding conditions.

Such a display on the display devices 20a and 21a makes it easy for the operator to know at the casting site, for example, what kind of speed the actual casting injection speed of the current injection device 3 and the mold is with respect to the set injection speed. It becomes possible to grasp. As described above, in the die casting machine 1 using the molding condition determination method according to the present embodiment, the user or the operator can easily grasp the results of various determinations as described above in the field.

Further, according to the molding condition determination method according to the present embodiment, the magnitude of the acceleration of the injection device 3 of the die casting machine 1 can be calculated by using the input target setting information, so that the acceleration is taken into consideration. Therefore, it is possible to determine whether or not the actual casting injection speed can reach the target injection speed at a predetermined distance and time (particularly, the distance and time of the high-speed filling section). Further, it is possible to calculate the arrival time and the arrival distance of the injection device 3 to the target injection speed, and determine whether or not the speed condition included in the molding condition can be realized.

Further, in the middle of injection filling in the injection filling process, it is determined whether the acceleration decreases or can be sustained, and the length of time required for the plunger tip 11 to cross the high-speed filling section is calculated from the speed condition and shortened. It is also possible to determine whether or not time filling is possible. From the velocity condition, it is also possible to calculate the distance required to cross the high-speed filling section and compare it with the set value included in the target setting information to determine its validity.

Then, as described above, by drawing a filling pressure curve PC having a margin of the molten metal filling pressure that produces the acceleration required for injection filling according to the molding conditions on the PV ^2- line diagram, for example, a mold. Since it is possible to determine the output characteristics of the machine capable of producing the same acceleration even when the above is changed, it is possible to determine whether or not the size of the injection device 3 in the die casting machine 1 can be determined by using this.

As shown in FIG. 7, the molding condition determination process when the molding condition determination program of the present invention is executed is performed by, for example, the following procedure. First, an operator or the like inputs information on the casting ability of the die casting machine 1 and information on the mold conditions of the dies 6 and 7 attached to the die casting machine 1 by using an input means of a computer (step S100). Next, the drawing means of the computer ^{creates a PV 2-} line diagram in the work area of the storage means and displays it on the display device of the computer (step S110). Subsequently, the additional means of the computer is based on the acceleration calculated based on the filling resistance of the molds 6 and 7, the acceleration resistance of the injection device 3, and the weight of the movable part of the injection device 3 on the PV ^{2 diagram.} Acceleration information (shift mold characteristic line SD or filling pressure curve PC) is added (step S120). Then, based on this acceleration information, the determination means of the computer performs the determination process of the molding conditions indicated by the target setting information input to the die casting machine 1 (step S130).

If the result that there is no problem in the molding conditions is obtained after the determination process (Yes in step S140), the output means of the computer outputs the determination result information (step S160), and the process according to this flowchart ends. .. When the result that there is a problem in the molding condition is obtained (No in step S140), the navigation process is performed by the navigation means of the computer (step S150), and then the output means of the computer outputs the determination result information. (Step S160), the process is terminated.

In the navigation process of step S150, for example, when it is determined that the target setting information does not satisfy the molding conditions, various information is displayed on the display screens of the display devices 20a and 21a described above, and the molding conditions are set. For example, navigating the user or operator as to what kind of measures should be taken to satisfy the requirements.

As described above, in the molding condition determination method, the molding condition determination device, and the molding condition determination program according to the present embodiment, the gold attached by determining the molding conditions indicated by the target setting information input to the die casting machine 1. It is possible to easily grasp whether the mold conditions of the mold and the casting ability of the die casting machine 1 satisfy the molding conditions, and if not, what kind of capacity and conditions are required.

Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

^{For example, in the above-described embodiment, it is assumed that the PV 2-} line diagram or the P-Q ^2- line diagram can be displayed on the display devices of the operation panel 20 of the die casting machine 1 and the display devices 20a and 21a of the control panel 21. was, but is not limited to this, management responsibilities and others in the field is, in notebook computers and tablet devices on the display screen to be used for site management, P-V ² from the control panel 21 of the die casting machine 1 by wireless and wired the diagram or P-Q data of ² diagram by transceiver displays various information may be input by or edited.

1 Die-casting machine 2 Mold device 3 Injection device 6 Fixed mold 7 Movable mold 10 Injection cylinder 20 Operation panel 20a Display device 21 Control panel 21a Display device M Machine characteristic line D Mold characteristic line SD Shift mold characteristic line TM Target Machine characteristic line PC filling pressure curve

Claims (11)

The vertical axis is the molten metal filling pressure, and the horizontal axis is the squared value of the injection speed of the injection device of the die casting machine. The machine characteristic line based on the casting ability of the die casting machine and the filling resistance of the mold attached to the die casting machine are shown. ^{Create a PV 2-} line diagram with the mold characteristic lines drawn,
Adding the target acceleration and the injection-acceleration information calculated based on the weight of the moving part of the device on the P-V ^2-wire diagram,
Based on the acceleration information, the molding conditions indicated by the target setting information input to the die casting machine are determined.
A molding condition determination method characterized by outputting determination result information regarding the molding condition according to the determination result. The acceleration information is
The molding condition determination method according to claim 1, wherein the shift mold characteristic line is obtained by translating the mold characteristic line on the PV ^{2 diagram.} The acceleration information is
The molding condition determination method according to claim 1, wherein the filling pressure curve represents an actual casting acceleration model drawn on the upper side of the mold characteristic line on the PV ^{2 diagram.} The target setting information includes the target injection speed of the injection device.
The determination result information includes appropriate setting information satisfying the molding conditions.
The appropriate setting information includes the distance of the high-speed filling section of the actual casting injection speed to reach the target injection speed from the rise of the molten metal level to the vicinity of the gate to just before the mold cavity is completely filled with the molten metal. The molding condition determination method according to any one of claims 1 to 3, wherein the method comprises at least one time. The molding condition determination method according to claim 4, wherein the casting ability of the die casting machine and the molding conditions when the mold conditions of the mold are changed are determined and presented based on the appropriate setting information. The vertical axis is the molten metal filling pressure, and the horizontal axis is the squared value of the injection speed of the injection device of the die casting machine. The machine characteristic line based on the casting ability of the die casting machine and the filling resistance of the mold attached to the die casting machine are shown. A drawing means for calculating a mold characteristic line and creating a PV ^2- line diagram on the work area of the storage means, and
Adding means for adding said target acceleration and injection-acceleration information calculated based on the weight of the moving part of the device on the P-V ^2-wire diagram,
Based on the acceleration information, a determination means for determining the molding conditions indicated by the target setting information input to the die casting machine, and
A molding condition determination device including an output means for outputting determination result information regarding the molding condition according to the determination result. The molding condition according to claim 6, wherein the additional means adds a shift mold characteristic line obtained by translating the mold characteristic line as the acceleration information on the ^{PV 2 diagram.} Judgment device. The additional means is characterized in that a filling pressure curve representing an actual casting acceleration model drawn on the upper side of the mold characteristic line ^{is added as the acceleration information on the PV 2 diagram.} 6. The molding condition determination device according to 6. The target setting information includes the target injection speed of the injection device.
The determination result information includes appropriate setting information satisfying the molding conditions.
The molding condition determination according to any one of claims 6 to 8, wherein the proper setting information includes at least one of a distance and a time of a high-speed filling section of an actual casting injection speed that reaches the target injection speed. Device. 9. The invention according to claim 9, further comprising a molding condition presenting means for determining and presenting the casting ability of the die casting machine and the molding conditions when the mold conditions of the mold are changed based on the appropriate setting information. Molding condition judgment device. On the computer
An input procedure for inputting information on the casting ability of the die casting machine and information on the mold conditions of the mold attached to the die casting machine, and
The vertical axis is the molten metal filling pressure, and the horizontal axis is the squared value of the injection speed of the injection device of the die casting machine. The machine characteristic line based on the casting ability and the mold characteristic line based on the mold condition are drawn. a creation procedure for creating a V ^2-wire diagram,
And additional steps of adding the target acceleration and the injection-acceleration information calculated based on the weight of the moving part of the device on the P-V ^2-wire diagram,
A determination procedure for determining the molding conditions indicated by the target setting information input to the die casting machine based on the acceleration information, and a determination procedure.
A molding condition determination program for executing an output procedure for outputting determination result information regarding the molding condition according to the determination result.

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