CN113811404A

CN113811404A - Machining process design system, machining process design method, and machining process design program

Info

Publication number: CN113811404A
Application number: CN202080034655.4A
Authority: CN
Inventors: 小林康彦; 坂本英次; 谷上哲也
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2019-07-17
Filing date: 2020-05-08
Publication date: 2021-12-17
Anticipated expiration: 2040-05-08
Also published as: JP2021016869A; CN113811404B; JP6758457B1; WO2021009998A1

Abstract

The present invention can appropriately determine a process recipe for forming a die forging process for forming a die into a desired target shape and a die recipe used in the process recipe. A machining process design computer (F40) includes a CPU (F41) and is capable of generating a process recipe including 1 or more steps for forming a workpiece into a predetermined target shape, wherein the CPU (F41) receives inputs of the shape and the target shape of the workpiece, determines a process recipe including a die recipe used in each step based on the shape and the target shape of the workpiece, defines a virtual die composed of a plurality of virtual die blocks for each step when determining the process recipe, and executes a simulation of forging with the virtual die in each step for analysis.

Description

Machining process design system, machining process design method, and machining process design program

Technical Field

The present invention relates to a technique for designing an engineering scheme including a die scheme in a die forging process.

Background

In die forging for forming a workpiece (hereinafter, sometimes referred to as a workpiece) into a predetermined part shape by using a press machine, a multi-step die forging process for forming in a plurality of steps is required in the case where the workpiece cannot be filled in a die because of a complicated shape or the forming in 1 step is difficult because of a load reduction in the press machine.

In order to perform the multi-step die forging process, the number of steps required for forging and the shape of the die used in each step need to be designed.

As a technique for designing a forging step, for example, a technique disclosed in patent document 1 is known.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2008-110398

Disclosure of Invention

Problems to be solved by the invention

In designing a multi-step die forging process, the number of steps required to form a member to be formed by forging (hereinafter referred to as a target shape) and the shape of a die used in each step are unknown. In particular, the degree of freedom in designing the mold shape is large, and the process design including the mold shape is difficult.

Here, for example, as shown in fig. 2, a design of a multi-step die forging process for forming a target shape F110 shown in fig. 1 from a workpiece F120 will be described. In fig. 1, a top view, a side view, and a cross-sectional view along the line a-a of the target shape F110 are shown from above. The target shape F110 is an axisymmetric (symmetric with respect to the central axis) and vertically symmetric shape, but this is an example, and the target shape may not be axisymmetric or vertically symmetric.

In the case where there is no design rule for the die shape, the dies used in 1 step of the multi-step die forging process for forming the target shape F110 need to determine the shapes used in the respective steps from all the free-form surfaces, and therefore, the degree of freedom in design is high, and the amount of work required for design is enormous. The mold used in 1 step can have a shape shown in fig. 3, for example.

For such a design of the multi-step die forging process, the process design including the die design is studied in a trial and error manner, and the time required for the design, the forming accuracy of the target shape by the multi-step die forging process, the manufacturing cost, and the like greatly depend on the professional knowledge of the designer.

Due to the background of reduced skill in the manufacturing industry in recent years, there is a demand for a process design including a mold design that can be easily and appropriately performed.

In order to solve the problem in designing such a multi-step die forging process, none of the techniques disclosed in patent document 1 is directed to designing a forging step composed of a plurality of steps. Therefore, the process design including the die design in the multi-process die forging process cannot be performed using these techniques.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a technique capable of easily and appropriately determining a process recipe for forming a die forging process to a desired target shape and a die recipe used in the process recipe.

Means for solving the problems

In order to solve the above-described problems, a machining process designing system according to one aspect is a machining process designing system including a processor capable of generating a process recipe including 1 or more steps for forming a workpiece into a predetermined target shape, wherein the processor receives an input of a shape and a target shape of the workpiece, determines the process recipe including a die recipe used in each step based on the shape and the target shape of the workpiece, defines a virtual die including a plurality of virtual die blocks for each step when determining the process recipe, and executes analysis by performing simulation on forging using the virtual die in each step.

Effects of the invention

According to the present invention, it is possible to easily and appropriately determine the process recipe for forming the die forging process to be formed into a desired target shape and the die recipe used in the process recipe.

Drawings

Fig. 1 is a diagram showing an example of a target shape of a die formed by a multi-step die forging process.

FIG. 2 is a cross-sectional view of the workpiece and target shape prior to forging.

Fig. 3 is a diagram showing an example of a die used in 1 step of the multi-step die forging process.

Fig. 4 is a diagram illustrating a kind of a partial mold.

Fig. 5 is a diagram illustrating a region of a partial mold in a virtual mold.

Fig. 6 is a view showing an example of a virtual mold formed by combining partial molds.

Fig. 7 is a diagram illustrating a die scheme used in a process scheme of the die forging process.

Fig. 8 is a sectional view showing a deformation process of a workpiece in the die forging process.

FIG. 9 is an overall block diagram of a computer system of one embodiment.

FIG. 10 is a block diagram of a process design computer according to one embodiment.

FIG. 11 is a flow diagram of a process design process according to one embodiment.

Fig. 12 is a sectional view showing a deformation process of the workpiece when the final target shape is generated from the workpiece passing through the intermediate target shape.

Fig. 13 is a diagram showing an example of a process recipe for creating an intermediate target shape from an unprocessed workpiece.

Fig. 14 is a sectional view showing a process of deforming a workpiece in the die forging step.

Detailed Description

The embodiments are explained with reference to the drawings. The embodiments described below do not limit the invention described in the claims, and all of the elements and combinations thereof described in the embodiments are not necessarily essential to the solution of the invention.

Here, in the present specification, a forging process performed on a workpiece using the same die is regarded as 1 step, and for example, when a forging process is performed using the same die continuously a plurality of times under other conditions (different temperature conditions or the like), the plurality of forging processes are regarded as 1 step.

The mold shape can be designed based on an infinite number of free-form surfaces, but when designing based on an infinite number of free-form surfaces, the number of mold shapes that can be considered is enormous, and the amount of work required for designing becomes enormous. In the present embodiment, the mold is configured by a plurality of partial molds (virtual mold blocks), each partial mold is formed into a shape corresponding to one of a plurality of functions, and the partial molds are combined to create a mold (virtual mold) that is a candidate for a mold plan.

< type of partial mold >

Here, an example in which the target shape F110 shown in fig. 1 is assumed to be generated will be described with respect to the type of function (action) of the partial mold.

Fig. 4 is a diagram illustrating a kind of a partial mold.

As the partial mold, for example, a mold having 5 functions of partial mold numbers 0, 1-1, 2-2, and 3 is considered. These functions are required in the die forging step for producing the target shape F110, and can be extracted with reference to the design results of the forging step in the past and the like.

The function of the partial die number "0" is to intentionally prevent the partial die from coming into contact with the workpiece in consideration of reduction in load (forging load) of the press during forging and fluidity of the workpiece. The function of the partial mold number "1-1" is to deform the workpiece into the shape of the region of the target shape corresponding to the partial mold. The shape of the partial mold having this function is a shape of a region to which a corresponding target shape is transferred. The function of the partial die number "2-1" is to enlarge the diameter of the workpiece without deforming the workpiece into the target shape F110. The shape of the partial mold having this function is, for example, a flat shape. The function of the partial die number "2-2" is to enlarge the diameter of the workpiece without transferring the workpiece to the target shape F110. The shape of the part mold having this function is, for example, a taper shape. The function of the partial die number "3" is a function of restricting deformation of the workpiece in the radial direction.

By appropriately assigning these functions to the partial molds, a mold recipe required in the step of generating the target shape F110 can be generated. Further, by combining a plurality of partial molds having any of these functions, it is possible to control the generation of a limited number of molds that are candidates for a mold recipe to some extent. Therefore, the calculation processing for determining the mold recipe, which will be described later, can be reduced, and the calculation time can be shortened. From another perspective, it is believed that this effectively creates a better mold solution.

The function of the partial mold is not limited to the example shown in fig. 4, and various functions can be provided.

< area of partial mold in imaginary mold >

Next, a part of the virtual mold will be described.

Fig. 5 is a diagram illustrating a region of a partial mold in a virtual mold. Fig. 6 is a view showing an example of a virtual mold formed by combining partial molds. The numbers described in the partial molds (F141 to F145) in fig. 6 indicate the partial mold numbers shown in fig. 4.

The area of the partial mold in the virtual mold is determined based on, for example, the area of the target shape F110. In the present embodiment, as shown in fig. 5, at least a part of the portion of the target shape F110 where the height changes is defined as a boundary of a region, and a region (portion) of the mold corresponding to the region is defined as a partial mold. Specifically, regions a1 to a5 are provided in this order from the center of the target shape F110, and as shown in fig. 6, regions of the mold F140 corresponding to these regions (facing these regions) are set as the partial molds F141 to F145. Specifically, the partial mold F141 corresponds to the region a1, the partial mold F142 corresponds to the region a2, the partial mold F143 corresponds to the region A3, the partial mold F144 corresponds to the region a4, and the partial mold F145 corresponds to the region a 5. The region a1 has a circular top surface, and the top surfaces of the other regions a2 to a5 have circular ring shapes, and the top surfaces of the partial molds F141 to F145 corresponding to these regions have the same shape. In this way, when the region of the partial mold corresponds to a circular shape or an annular shape, the same function can be assigned to the entire partial mold when the target shape is axisymmetric.

In the present embodiment, a plurality of virtual molds can be easily generated by associating any of the functions of the partial molds shown in fig. 4 with the partial molds F141 to F145. In the example of fig. 6, the partial mold F141 is a partial mold having a function of the partial mold number "0", the partial molds F142 and F143 are partial molds having a function of the partial mold number "1-1", and the partial molds F144 and F145 are partial molds having a function of the partial mold number "2-1".

In the present embodiment, the mold F140 is configured by combining the partial molds F141 to F145, but the mold F140 is a virtual mold used for detecting an appropriate mold pattern. Therefore, when the target shape is actually generated, a mold integrally formed in the shape of the mold F140 may be manufactured and used, or a mold in which partial molds are combined as in the mold F140 may be manufactured and used.

< die forging Process comprising multiple Steps

Next, an example of a die forging process scheme including a plurality of steps for generating the target shape F110 from the workpiece F120 will be described.

Die forging step pattern F145 includes 3 forging steps, i.e., a forging step (first step) using die pattern F150, a forging step (second step) using die pattern F160, and a forging step (third step) using die pattern F170.

Mold pattern F150 is composed of partial molds F151 to F155 corresponding to regions A1 to A5. The partial mold F151 is assigned a partial mold corresponding to the partial mold number "1-1", and the partial molds F152 to F155 are assigned partial molds corresponding to the partial mold number "2-1". Thus, the die set pattern F150 is a die in which the entire surface of the workpiece side is flat.

Mold pattern F160 is composed of partial molds F161 to F165 corresponding to regions a1 to a 5. A partial mold corresponding to the partial mold number "0" is assigned to the partial mold F161, a partial mold corresponding to the partial mold number "1-1" is assigned to the partial molds F162 and F163, and a partial mold corresponding to the partial mold number "2-1" is assigned to the partial molds F164 and F165. Thus, the die set F160 is a die that transfers the groove shape based on the target shape F110 on the inner peripheral side of the workpiece side.

Mold pattern F170 is composed of partial molds F171 to F175 corresponding to regions A1 to A5. The partial molds F171 to F173 are assigned a partial mold corresponding to the partial mold number "0", the partial mold F174 is assigned a partial mold corresponding to the partial mold number "1-1", and the partial mold F175 is assigned a partial mold corresponding to the partial mold number "3". Thus, the mold recipe F170 is a mold that realizes shape transfer of the outer peripheral portion of the workpiece and deformation restriction of the outermost periphery.

The amount of advancement of the die (the amount of sandwiching the upper and lower dies) corresponding to the die pattern in each step is set to the amount of advancement necessary to make the thickness of the workpiece, which is achieved by advancement using the partial die corresponding to the partial die number "1-1", the same as the target shape F110.

Next, a process of deforming the workpiece by the die forging process recipe F145 shown in fig. 7 will be described.

Fig. 8 is a sectional view showing a deformation process of a workpiece in the die forging step.

First, in the first step of using the die corresponding to the die pattern F150, the workpiece F120 before forging is deformed into the shape of the workpiece F190. Specifically, in the first step, the region a1 of the workpiece F120 is formed into the shape of the target shape F110 by the partial die F151 of the partial die number "1-1", and the regions a2 to a5 are enlarged in diameter by the partial dies F152 to F155 of the partial die number "2-1", instead of being formed into the shape of the target shape F110.

Next, in the second step using the die corresponding to the die pattern F160, the workpiece F190 is deformed into the shape of the workpiece F200. Specifically, in the second step, the regions a2, A3 of the workpiece F190 are formed into the shape of the target shape F110 by the partial dies F162, F163 of the partial die number "1-1", and the regions a4, a5 are formed into the enlarged diameter not into the shape of the target shape F110 by the partial dies F164, F165 of the partial die number "2-1". In the region a1 formed into the shape of the target shape F110 in the first step, the partial die F161 of the partial die number "0" does not contact the workpiece F190, and therefore, the effect of reducing the load in the press mechanism can be obtained.

Next, in the third step of using the die corresponding to the die layout F170, the workpiece F200 is deformed into the shape of the workpiece F210, that is, the shape conforming to the target shape F110. Specifically, in the second step, the region a4 is molded into the shape of the target shape F110 by the partial die F174 of the partial die number "1-1", and the region a5 is subjected to the molding of the outermost periphery while the deformation in the radial direction is restricted by the partial die F175 of the partial die number "3". In addition, in the regions a1 to A3 which have been formed into the shape of the target shape F110 in the first step and the second step, the partial dies F171 to F173 of the partial die number "0" do not contact the workpiece F200, so that the effect of reducing the load in the press mechanism can be obtained.

< System architecture >

Next, a configuration of a computer system according to an embodiment will be described.

FIG. 9 is an overall block diagram of a computer system of one embodiment.

The computer system F10 includes a machining process designing computer F40, a management computer F20, and 1 or more display computers F30 as an example of the machining process designing system. The machining process design computer F40 and the management computer F20 are connected via a network F11. The machining process designing computer F40 and the display computer F30 are connected via a network F11.

The machining process design computer F40 is, for example, a server provided with a storage resource F44 (see fig. 10) and a CPU F41 (see fig. 10) at minimum, and has a machining process design program F441 (see fig. 10) described later installed therein. The storage resource F44 stores CAD data representing the shape of the workpiece and the target shape, calculation execution conditions, a schematic diagram of the engineering project after execution of the calculation, and an analysis result file of the finite element analysis, which are input conditions of the machining process design program F441.

The management computer F20 is a computer used by a system administrator of the machining process designing computer F40. The system administrator monitors the storage medium capacity and the usage rate of each user and the like of the process design computer F40 by using the management computer F20 and uses them for service operation.

The display computer F30 is a computer used by a user who uses the machining process designing computer F40. The display computer F30 accesses the machining process designing computer F40, and transmits the text-format information such as the automatic design conditions for the multiple steps and the maximum allowable forging load, which are input by the user, and the CAD data such as the target shape and the workpiece shape to the GUI F442 (see fig. 10) of the machining process designing computer F40. The conditions input by the user are stored in the storage resource F44 of the machining process designing computer F40, and the machining process designing computer F40 performs process designing based on the stored data. The display computer F30 displays the process recipe obtained as a result of the process design via the GUI F442 of the machining process designing computer F40. Thus, the user can browse the process recipe.

Hardware

Next, a configuration of a machining process design computer according to an embodiment will be described.

The machining process design computer F40 is, for example, a personal computer or a general-purpose computer. The machining process design computer F40 includes a CPU F41 as an example of a processor, a network interface F42 (Net I/F in the drawing), a User interface F43 (User I/F in the drawing), a storage resource F44 as an example of a storage unit, and an internal network connecting these components.

The CPU F41 is capable of executing programs saved in the storage resource F44. The storage resource F44 stores a program to be executed in the CPU F41, various information used in the program, CAD data, and the like. In the present embodiment, the storage resource F44 stores a machining process design program F441. The storage resource F44 may be, for example, a semiconductor memory, a flash memory, an HDD (Hard Disk Drive), an SSD (Solid State Drive), or the like, and may be a volatile memory or a nonvolatile memory.

The network interface F42 is an interface for communication with external devices (for example, the management computer F20, the display computer F30, and the like) via the network F11.

The user interface F43 is, for example, a touch panel, a display, a keyboard, a mouse, or the like, but may be other devices as long as they can receive an operation by an operator (user) and display information. The user interface F43 may be constituted by the plurality of devices.

< program run in computer for designing processing technology >

< design procedure of processing technology >

The machining process designing program F441 includes a GUI (Graphical User Interface) F442, an optimum process determining module F443, and an optimum process designing module F444.

The GUI F442 is executed by the CPU F41 to perform input processing of design conditions and presentation processing of a process recipe that satisfies a target value.

The GUI F442 displays an input screen of the design condition, and accepts input of the following information. Further, the input of each piece of information or a part of items of each piece of information may be accepted.

Maximum number of steps designed in the design of working procedure

Definition of design variables, e.g. type of part mould, distribution area of part mould

Specification of finite element simulation solver for use

Shape of workpiece

The target shape. The target shape is a target shape in the design of the process recipe, and may be a shape of a final product in the forging process, or may be an intermediate target shape (intermediate target shape) in the forging process.

Definition of objective function. The objective function may be defined, for example, by specifying an evaluation method of minimizing a shape error between a forged shape forged by a recipe and a target shape, minimizing a forging load, and the like.

The restriction conditions are as follows. The constraint conditions include, for example, the forging load of the press mechanism used, the wear of the die, and the like.

Maximum number of calculations for finite element simulation

Size of mesh in finite element simulation

The target value. The target value is an evaluation value of the objective function, and is, for example, a value of an allowable shape error (for example, a maximum value), a value of an allowable forging load in a press mechanism (for example, a maximum value), or the like.

The GUI F442 is executed by the CPU F41 to present a result screen regarding the process recipe that satisfies the target value. The result screen may include the following information.

Schematic diagram showing the obtained process scheme

It is directed to a link (link for browsing) for displaying an analysis result file for an outline process recipe in detail. The user can access the analysis result file by selecting the link for browsing with the display computer F30, and can evaluate the content of the analysis result (for example, forging load, stress, strain, and the like). The access to the analysis result file and the evaluation of the analysis result may be performed by using a result display function of finite element simulation software in the display computer F30, or may be performed by using spreadsheet software or the like for text data of the analysis result file.

The optimal process determination module F443 is executed by the CPU F41 to specify the number of processes in the process recipe and determine whether or not an optimal process is possible. The optimum process determination module F443 specifies a fixed number within a range not more than the maximum number of processes specified by the GUI F442. In the optimal process availability determination, the optimal process determination module F443 determines a process recipe in which the optimal process satisfies a target value, such as shape accuracy, specified by the GUI F442 by evaluating whether the optimal process determined by the optimal process design module F444 satisfies the target value.

The optimum process designing module F444 is executed by the CPU F41 to generate process information such as a mold shape, generate a finite element model, execute simulation, and search for optimum design conditions based on the simulation result. Specific processing performed by the optimum process design module F444 is described later with reference to fig. 11.

In the machining process designing computer F40, when the GUI F442 receives an input of a design condition and an instruction to start the automatic design from the user, the input condition is passed to the optimum process determination module F443, and the optimum process determination module F443 inputs the number of processes and the design condition to the optimum process designing module F444. The optimum process designing module F444 searches for an optimum process based on the input number of processes and design conditions, and returns the derived optimum process to the optimum process judging module F443. In the optimal process determination module F443, if the returned optimal process satisfies the target value, the process recipe satisfying the target value is returned to the GUI F442, and the user can browse the result of the optimal process returned to the GUI F442. On the other hand, if the optimal process returned by the optimal process designing module F444 does not satisfy the target value, the optimal process determining module F443 resets the number of processes (increases the number of processes by 1), and the optimal process designing module F444 newly designs the optimal process based on the reset number of processes.

According to the machining process designing computer F40 described above, the user can easily design the optimum process without the need for trial and error by simply inputting the design conditions to the GUI F442. In addition, since the GUI F442 is used, the user can intuitively perform the operation.

Next, a processing operation in the machining process designing computer F40 according to one embodiment will be described.

Designing and processing technology

The GUI F442 of the machining process designing computer F40 receives user inputs of design conditions such as the maximum number of steps, the type of part mold, the distribution area of part mold, and a finite element simulation solver (step (1)). Next, the optimal process determination module F443 sets the number of processes (candidate values) of the process for determining the optimal process to 1 (an example of the first value) (step (2)), and the optimal process design module F444 executes the process for determining the optimal process by executing the following repeated processes (steps (3-1), (3-2), and (3-2)) (step (3)).

In the repetitive process, the optimum process designing module F444 determines conditions for the assignment of the partial molds in the repetitive process, and generates a mold recipe in accordance with the conditions for the assignment of the partial molds (step (3-1)). Here, the condition for the assignment of the partial mold refers to which function the partial mold has been assigned (set) to the assignment region of each partial mold, and the optimal process designing module F444 may be performed using an optimization solver or may determine the assignment condition by any method in the generation of the condition.

Next, the optimum process design module F444 performs the condition generation of the advance amount of each process so that the workpiece thickness in the region of the partial mold assigned the partial mold numbers "1-1" and "1-2" of the mold shape becomes the thickness of the target shape (step (3-2)). Next, the optimum process designing module F444 performs analysis of finite element simulation based on these conditions, and calculates analysis results such as a shape error between the forged shape and the target shape forged in the process satisfying these conditions, and a forging load in the process (step (3-3)).

In step (3), the optimal process designing module F444 executes the above-described repetitive processes, determines a process having the smallest predetermined target value based on the results obtained by these repetitive processes, derives an optimal process for the specified number of processes, and notifies the optimal process determining module F443 of the derived optimal process. Here, the target value may be, for example, a value regarding a shape error from a target shape (target shape accuracy) under a load constraint of a press machine, that is, a value regarding a degree of conformity of a shape of a forged workpiece with a shape of the target shape.

Next, the optimal process determination module F443 determines whether or not the notified optimal process satisfies a predetermined target value (target shape accuracy, etc.) (step (4)). As a result, when the optimal process is determined not to satisfy the predetermined target value (no in step (4)), the optimal process determination module F443 increments the number of processes for determining the optimal process by 1 and notifies the optimal process design module F444 (step (5)), and the process proceeds to step (3). Thus, in step (3), the process of determining the optimum process for the value (an example of the second value) obtained by increasing the number of processes by 1 is performed.

On the other hand, when it is determined that the optimal process satisfies the predetermined target value (yes in step (4)), the optimal process determination module F443 transfers the optimal process satisfying the target value to the GUI F442 as the optimal process recipe in the process, and the GUI D442 presents the process recipe to the user by outputting the process recipe (step (6)), thereby ending the process.

According to the above processing technique designing process, the process recipe including the mold recipe can be appropriately designed without the need for a trial and error type study by the user. In the present embodiment, the number of steps for deriving the optimal step is set in order from 1, the optimal step in deriving the set number of steps is set, and the optimal step in the process for obtaining the target shape is set based on whether or not the derived optimal step satisfies the target value. This reduces the number of dies used for actual machining, thereby reducing the cost and shortening the manufacturing lead time by reducing the number of steps.

< deformation >

The present invention is not limited to the above embodiment, and includes various modifications. For example, the above embodiments are described in detail to explain the present invention easily and understandably, and are not limited to having all the configurations described. Further, a part of the structure of one embodiment may be replaced with the structure of another embodiment, and the structure of another embodiment may be added to the structure of one embodiment. In addition, other configurations can be added, deleted, and replaced for a part of the configurations of the embodiments.

< Generation of target shape Via intermediate target shape >

When a target shape is formed from an unmachined workpiece, the target shape may be formed through a predetermined intermediate target shape depending on, for example, a forging load of a press mechanism. For example, as shown in fig. 8, when the workpiece F190 cannot be generated from the unprocessed workpiece F120 in 1 step, the unprocessed workpiece F120 is first set to the intermediate target shape.

Fig. 12 is a sectional view showing a deformation process of the workpiece when the final target shape in the forging step is generated from the workpiece through the intermediate target shape.

When the final target shape F110 is generated from the workpiece F120, the intermediate target shape F215 is generated in 1 or more steps for the workpiece F120, and the target shape F110 is generated from the intermediate target shape F215 in 1 or more steps.

Here, a process of a process recipe when the final target shape F210 in forging is generated from the workpiece F120 via the intermediate target shape F215 will be described.

First, the machining process design computer F40 executes the machining process design processing shown in fig. 11 to create a process recipe of the die forging process for creating the intermediate target shape F215 from the unprocessed workpiece F120. In this machining process designing process, an intermediate target shape, conditions corresponding to the intermediate target shape, and the like are input instead of the target shape, the conditions corresponding to the target shape, and the like.

By this machining process designing process, a process recipe is determined as an optimum process for generating the intermediate target shape F215 from the workpiece F120. By this machining process designing process, a process recipe consisting of 1 process shown in fig. 13 is determined, for example.

Process recipe F216 is 1 process, and mold recipe F220 is used in this process. Mold pattern F220 is composed of partial molds F221 to F225 corresponding to regions A1 to A5. For the partial molds F221 to F225, the partial mold corresponding to the partial mold model "1-1" is assigned. Thus, the die set pattern F220 is a die in which the entire surface of the workpiece side is flat. The amount of advancement in this step is set to an amount necessary to make the thickness of the workpiece, which is achieved by advancement using the partial die corresponding to the partial die number "1-1", the same as the intermediate target shape F215.

Next, the machining process design computer F40 executes the machining process design processing shown in fig. 11 to generate a process recipe of the die forging process for generating the target shape F210 from the intermediate target shape F215. Here, in this machining process designing process, an intermediate target shape is input instead of the workpiece shape.

The machining process design process determines a process recipe as an optimum process for generating the target shape F210 from the intermediate target shape F215. By this machining process designing process, for example, a process recipe F145 composed of 3 steps shown in fig. 7 is determined.

Next, the machining process design computer F40 combines the recipe F216 for creating the intermediate target shape F215 from the unprocessed workpiece F120 and the recipe F145 for creating the target shape F210 from the intermediate target shape F215 as recipes for creating the target shape F210 from the unprocessed workpiece F120. This process scheme is composed of 4 steps using 4 types of molds F220, F150, F160, and F170, respectively.

As described above, it is possible to easily design a process recipe in a process of generating a target shape from an unprocessed workpiece through an intermediate target shape.

Next, a process of deforming a workpiece in a process recipe in which the process recipe F216 and the process recipe F145 are combined will be described.

First, in the first step, the workpiece F120 before machining is deformed into the intermediate target shape F215 using a die corresponding to the die F220. Specifically, in the first step, the regions a1 through a5 of the workpiece F120 are formed into the shape of the intermediate target shape F215 by the partial dies F221 through F225 of the partial die number "1-1".

Thereafter, as has been explained using fig. 8, the target intermediate shape F215 is shaped into the target shape F210 through the workpiece F190, the workpiece F200.

Part of mould

In the above embodiment, the region of the partial mold is determined based on the target shape, but the region of the partial mold is not limited to this, and any region may be used regardless of the target shape. For example, the width of the partial mold in the radial direction corresponding to the region on the center side of the target shape may be set to be larger as it is closer to the center axis of the target shape and smaller as it is farther from the center axis. In the above embodiment, the top surface of the partial mold is formed in a circular shape or an annular shape, but the top surface of the partial mold is not limited thereto and may be formed in any shape. For example, the partial mold may be an octahedron (for example, an octahedron whose top surface is hexagonal).

The number of partial molds in the mold (virtual mold) can be arbitrarily determined. For example, the number of partial molds may be fixed, or may be changed to a larger number when the target value is not satisfied in the machining process design (no in step (4)).

Other

In the above embodiment, the finite element simulation execution function is provided in the machining process design computer F40 and used, but the present invention is not limited to this, and the finite element simulation execution is not necessarily performed in the machining process design computer F40. For example, it may be that the generation of the finite element model is performed in the machining process designing computer F40, and for the finite element simulation, for example, analysis is performed using finite element simulation software already owned by the user in the display computer F30, and the result of the analysis is returned to the machining process designing computer F40. In this case, since the finite element simulation may not be executed by the machining process designing computer F40, the load on the machining process designing computer F40 can be reduced. In addition, when the user is burdened with the cost for executing the finite element simulation software in the machining process designing computer F40, the finite element simulation software can be executed without using the machining process designing computer F40, and therefore, the cost for using the machining process designing computer F40 can be reduced.

In the above embodiment, the example in which the machining process designing system is configured by 1 machining process designing computer F40 has been described, but the present invention is not limited to this, and the machining process designing system may be configured by a plurality of computers.

For example, the function of the partial mold is not limited to the above embodiment, and various functions can be provided. For example, the positioning function of the workpiece before forging may be included. By increasing the types of functions of the partial molds, a process recipe including an appropriate mold recipe in consideration of the operation conditions, formability, material characteristics of the workpiece, and the like can be determined.

In the above embodiment, the description has been given taking the target shape that is axisymmetric as an example, but the present invention is not limited to this, and can be applied to a case where the target shape is a three-dimensional complex shape. In addition, although the target shape is described as an example of the top-bottom symmetry, the target shape may not be the top-bottom symmetry. In this case, the shapes of the upper mold and the lower mold may be considered separately, and for example, the widths (radial widths) of the corresponding regions may be different between the upper mold and the lower mold, and the number of the partial molds constituting the molds may be different.

In the above embodiment, a part or all of the processing performed by the CPU F41 may be performed by a hardware circuit. In addition, the program in the above embodiment may be installed from a program source. The program source may be a program distribution server or a nonvolatile storage medium (e.g., a removable storage medium).

Description of the reference numerals

F10 … computer system, F11 … network, F20 … management computer, F30 … display computer, F40 … processing technology design computer, F41 … CPU, F42 … network interface, F43 … user interface, F44 … storage resource.

Claims

1. A machining process design system having a processor and capable of generating a process recipe including 1 or more steps for forming a workpiece into a predetermined target shape, the machining process design system characterized by:

the processor is used for processing the data to be processed,

accepting input of a shape of the workpiece and the target shape,

determining a process recipe including a mold recipe used in each process based on the shape of the workpiece and the target shape,

in determining the process recipe, a virtual die including a plurality of virtual die blocks is defined for each process, and a simulation of forging using the virtual die in each process is executed to analyze the virtual die.

2. The process design system of claim 1, wherein:

a plurality of functional tasks that can be assigned to the virtual mold blocks are preset,

the processor determines a shape of the virtual mold block based on the functional tasks assigned to the virtual mold block and the target shape.

3. The process design system of claim 1, wherein:

the processor determines the virtual mold in all the steps, in which the analysis result obtained by the simulation satisfies a predetermined target value, as a mold recipe.

4. The process design system of claim 3, wherein:

the target value is a value regarding a degree to which the shape of the workpiece obtained from the analysis result coincides with the shape of the target shape.

5. The process design system of claim 3, wherein:

the processor is used for processing the data to be processed,

setting the first value as a candidate value for the number of steps of the process recipe,

defining the virtual mold in each step of the number of steps corresponding to the candidate value,

when the analysis result does not satisfy a predetermined target value in the case of using the number of steps corresponding to the candidate value, the process is repeated with a second value larger than the first value as a new candidate value.

6. The process design system of claim 1, wherein:

the target shape is a shape symmetrical about a central axis,

the virtual mold block corresponds to a circular or annular region centered on the central axis.

7. The process design system of claim 2, wherein:

functional tasks that can be assigned to the virtual die block include at least a plurality of non-pressing of the workpiece, transferring of the target shape to the workpiece, enlarging of the diameter of the workpiece, and limiting of deformation of the workpiece in the radial direction.

8. A machining process designing method capable of creating a process recipe including 1 or more steps for forming a workpiece into a predetermined target shape, characterized in that:

receiving the shape of the workpiece and the target shape,

9. The processing design method according to claim 8, wherein:

a plurality of functional tasks that can be assigned to the virtual mold block are set in advance,

determining a shape of the virtual mold block based on the functional tasks assigned to the virtual mold block and the target shape.

10. The processing design method according to claim 8, wherein:

and determining the virtual mold in each step, in which the analysis result obtained by the simulation satisfies a predetermined target value, as a mold recipe.

11. The processing design method according to claim 10, wherein:

the target value is a value regarding a degree of coincidence between the shape of the workpiece obtained from the analysis result and the shape of the target shape.

12. The processing design method according to claim 10, wherein:

when the analysis result in the number of steps corresponding to the candidate value does not satisfy a predetermined target value, the process is repeated with a second value larger than the first value as a new candidate value.

13. The processing design method according to claim 8, wherein:

the target shape is a shape symmetrical about a central axis,

14. The processing design method according to claim 9, wherein:

15. A processing technology design program is characterized in that:

causing a computer to execute the machining process design method of any one of claims 8 to 14.