JP2014091175A - Processing line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing line capable of preventing carrying-in error by an operator.SOLUTION: A processing line 1 comprises: plural machine tools 5 having an opening/closing door 3 opening automatically when processing of a workpiece W has finished and performing same processing to the workpiece W; and control means 7 for controlling an opening/closing of the opening/closing door 3 of the plural machine tools 5. The control means 7 regulates an opening of the door of one machine tool when the door of another machine tool opens when the processing of the workpiece W has finished by one machine tool.

Description

  The present invention relates to opening / closing control of a processing line.

  A cylinder head or the like, which is a component of an engine, is manufactured by subjecting a workpiece to various machining operations by a machining line configured by arranging a plurality of general-purpose machine tools.

  The workpiece conveying apparatus of the following patent document 1 automatically conveys a workpiece to a predetermined machine tool. At this time, the transport cart picks up the pallet on which the workpiece is placed from the pallet storage, and moves to a predetermined machine tool. After the transport cart is positioned at a predetermined position in front of the machine tool, the transport cart is raised to the table height of the machine tool, and the pallet is pushed out to the table of the machine tool by the advancing and retracting members provided in the transport cart. The workpiece is carried into the machine tool.

JP 2008-221374 A

  In the conveyance device of Patent Document 1, the workpiece can be automatically transferred to the machine tool by controlling the conveyance carriage. Therefore, the workpiece is not mistakenly conveyed to the machine tool in another process. However, in the above apparatus, the apparatus itself becomes large. For this reason, using a large-scale conveying device as described above for a workpiece that is sufficiently handled by a worker by hand, not only worsening the work efficiency but also increasing the manufacturing cost.

  Therefore, it is also an effective conveying method that the worker carries the workpiece into the machine tool by hand handling conveyance. On the other hand, in such a processing line, the machine tool arranged next is usually the machine tool for the next process. Therefore, the operator is likely to have a preconception that the adjacent machine tool is a machine tool used in the next process. For this reason, if multiple machine tools in the same process are arranged in parallel on a part of the processing line for the purpose of leveling the process capability, the operator mistakenly carries the processed workpiece to the adjacent machine tool. However, the same processing may be performed repeatedly. For this reason, the yield and production efficiency are reduced due to erroneous input.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a processing line that can prevent an operator from making a mistake even if the processing line includes a portion where a plurality of machine tools performing the same processing are arranged in parallel. And

  In order to achieve the above object, the machining line of the present invention includes an opening / closing door that automatically opens when machining of a workpiece, and a plurality of machine tools that perform the same machining on the workpiece, and a plurality of machines. In a processing line having control means for controlling opening and closing of a machine opening / closing door, when the processing means finishes processing of a workpiece by one machine tool, the opening / closing door of any other machine tool opens. If so, it is characterized by restricting the opening of one machine tool.

  The above processing line is constituted by a machine tool that automatically opens and closes the door when processing of the workpiece is completed. The processing line has a plurality of machine tools that perform the same processing. Among a plurality of machine tools that perform the same machining, when machining of one machine tool is completed, if the opening / closing door of one of the other machine tools is open, the opening / closing door of the one machine tool that has finished machining Opening is restricted. Thereby, it can prevent that an operator carries in a workpiece accidentally to the machine tool which performs the same process. Furthermore, since the workpieces are not repeatedly processed, a decrease in yield can be suppressed and a decrease in production efficiency can be prevented.

  Further, in the processing line of the present invention, even if one of the plurality of machine tools remains open for a long time, the workpieces carried into other machine tools continue. Is processed. Since the opening / closing operation of the opening / closing door is controlled by the control means in the plurality of machine tools, the opening / closing door of another machine tool is not opened unless the opening / closing door is closed even if the processing of the workpiece is completed. Does not open. Therefore, when the open / close door that has been open for a long time is closed, the open / close door of the machine tool that performs the same processing that is disposed next to the open / close door opens. For this reason, the operator may erroneously carry the workpiece into the adjacent machine tool that performs the same processing, and may repeatedly perform the same processing. Therefore, for example, an erroneous charging prevention timer is incorporated by the control means so as to allow the opening of the one machine tool after a predetermined time has elapsed since all other machine tools were closed.

  Thereby, it is possible to prevent the open / close doors of a plurality of machine tools performing the same processing from opening / closing continuously. That is, even if one of the plurality of machine tools is closed, the doors of other machine tools are not opened until a predetermined time has elapsed. Therefore, it is possible to prevent the worker from erroneously carrying the workpiece into an adjacent machine tool that performs the same machining. In addition, if the wrong input prevention timer is set so that the opening / closing door opens according to the time when the operator goes around the machining line, the operator goes around the machining line and tries to carry the workpiece into the machine tool. In accordance with the timing, among the plurality of machine tools, the open / close door of the other machine tool is opened, so that the operator can prevent the workpiece from being erroneously put into the machine tool that performs the same machining. .

  Further, the control means may be provided with detection means for detecting the presence or absence of a workpiece in the machine tool. Thereby, when the detection means detects that the workpiece has been carried into all of the plurality of machine tools provided with the control means, the control means starts opening / closing control of the open / close door. On the other hand, when the detection means detects that all the workpieces have been carried out from the plurality of machine tools provided with the control means, the opening / closing control of the opening / closing doors by the control means is reset and the opening / closing doors of the plurality of machine tools are opened. Open all at once. As a result, the operator can simply turn on / off the control means for controlling the doors of the plurality of machine tools by simply loading and unloading the workpieces to and from the work tool open / close doors. Can be operated off.

  According to the processing line of the present invention, it is possible to prevent an operator from erroneously bringing a workpiece into a machine tool that performs the same processing.

It is a top view of the processing line of the present invention. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance. It is a top view which shows a mode that a workpiece | work moves between machine tools by manual handling conveyance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the workpieces W1 to W8 are shown moving on the machining line. Further, the workpieces W1 to W8 are processed into a product shape as they move from the left end side to the right end side on the processing line (see arrows in FIG. 1).

  FIG. 1 shows a processing line 1 configured by arranging a plurality of machine tools 2. Each machine tool 2 constituting the processing line 1 includes an open / close door 3 and a processing start switch (not shown). When the machining start switch is pressed, the open / close door 3 of the machine tool 2 is automatically closed, and machining of the workpiece W in the machining space 9 of the machine tool 2 is started. The opening / closing door 3 of the machine 2 is automatically opened. Before the processing line 1 is operated, the open / close doors 3 of all machine tools 2 are opened. In the processing line 1 of the present embodiment, as an example, the first machine tool 4, the second machine tool 5 (5 a, 5 b, 5 c), and the third machine tool 6 are configured with five machine tools. First, the first process is performed by the first machine tool 4. Next, the second process is performed by the second machine tool 5, and finally the third process is performed by the third machine tool 6 to be processed into a final product shape. The second machine tool 5 composed of a plurality of machine tools (three in this embodiment) performs all the same processing. Further, the second machine tool 5 is provided with a control means 7 that collectively controls the opening / closing operation of the opening / closing door 3 that restricts the loading and unloading of the workpiece W.

  In the present embodiment, the machining time of the first machine tool 4 and the third machine tool 6 is 10 seconds, and the machining time of the second machine tool 5 is 30 seconds. The control means 7 for controlling the opening / closing of the opening / closing door 3 of the second machine tool 5 incorporates an erroneous charging prevention timer 8. Thereby, after any one of the second machine tools 5 is closed, the timer is counted, and it takes a predetermined time (at least until the operator 11 finishes passing the second machine tool 5). The open / close door 3 of any one of the second machine tools 5 except the second machine tool 5 that is closed after the elapse of time) opens. The processing space 9 of the second machine tool 5 is provided with detection means 10 for detecting that the workpiece W has been carried in, and control means for controlling the open / close door 3 of the second machine tool 5. 7 is connected.

  Next, the movement mode of the workpiece in the processing line 1 of the present invention will be described with reference to FIGS. 2 to 15 show the movement of the workpiece in time series every 10 seconds. When the processing line 1 is activated, the open / close doors 3 of all the machine tools 2 are in an open state (see FIG. 1). In the present embodiment, the worker 11 moves with the cart 12 between the processing lines 1 in the direction of the arrow. At this time, the work W carried in / out from the machine tool 2 is moved on the processing line while being placed on the cart 12. At this time, the movement time between the machine tools 2 and the time from when the operation switch of the machine tool 2 is pressed to when the machining is started are ignored for the sake of brevity.

  First, as shown in FIG. 2, the worker 11 carries the workpiece W <b> 1 placed on the cart 12 into the machining space 9 of the first machine tool 4. After closing the open / close door 3 of the first machine tool 4, the first machine tool 4 is actuated to start processing in the first step. After the workpiece W1 is machined for 10 seconds and the first process is finished, the open / close door 3 of the first machine tool 4 is automatically opened.

  FIG. 3 shows a state after 10 seconds have elapsed from the state of FIG. The workpiece W1 that has been processed in the first step is unloaded from the first machine tool 4, and a new workpiece W2 is loaded into the first machine tool 4, and the second workpiece W2 is loaded in the same manner as described above. One-step processing is started. On the other hand, the workpiece W1 unloaded from the first machine tool 4 is placed on the cart 12 and carried to the second machine tool 5a arranged immediately downstream of the first machine tool 4. The workpiece W1 conveyed to the second machine tool is carried into the machining space 9 of the second machine tool 5a, and machining in the second process is started.

  FIG. 4 shows a state after 10 seconds from the state of FIG. After the processing of the first step of the workpiece W2 is completed, the workpiece W2 is unloaded from the first machine tool 4, and a workpiece W3 is newly loaded into the first machine tool 4, and the workpiece W3. The first process is started. On the other hand, the workpiece W2 carried out is conveyed to the second machine tool 5b by the cart 12 and then carried into the machining space 9 of the second machine tool 5b. After the workpiece W2 is carried into the second machine tool 5b, the opening / closing door 3 of the second machine tool 5b is closed, and the second process is started. Since the processing time of the workpiece W1 carried into the second machine tool 5a is set to 30 seconds, the workpiece W1 is still being processed at this time, so the open / close door 3 of the second machine tool 5a is The door is closed. The conveyance of the workpiece W between the machine tools 2 and the loading / unloading of the workpiece W into / from the machine tool 2 are all performed by hand handling operations by the operator 11.

  FIG. 5 shows a state after 10 seconds from the state of FIG. When the processing of the first step of the workpiece W3 is completed, the worker 11 unloads the workpiece W3 from the first machine tool 4 in the same manner as described above. At the same time, the workpiece W4 is carried into the first machine tool 4, and the first process of the workpiece W4 is started. The unloaded workpiece W3 is transported to the second machine tool 5c by the cart 12, and then carried into the machining space of the second machine tool 5c. The opening / closing door 3 of the second machine tool 5c is closed and the second work tool 5c is closed. Two-step processing is started.

  At this time, the workpiece W is brought into the machining space 9 of all the second machine tools 5a, 5b, and 5c. The processing space 9 of the second machine tool 5 is provided with detection means 10 for detecting the presence or absence of the workpiece W. When the detection means 10 detects that the workpiece W has been carried into all the processing spaces 9 in the second machine tools 5a, 5b and 5c, the control means 7 is activated and the door 3 of the second machine tool 5 is opened. Open / close control is started. Thereby, when the opening / closing door 3 of any one of the second machine tools 5 is opened, the opening / closing doors 3 of the other second machine tools 5 do not open. Therefore, for example, even if the machining of the second machine tool 5b is completed after the machining of the second machine tool 5a is finished and the door is opened and before the operator returns, the second tool is controlled by the control means 7. The opening of the machine 5b is restricted. As a result, the plurality of second machine tools are not opened, so that the operator 11 mistakenly performs the same processing on the workpiece W that has been carried out (second machine tool 5b, 5c) can be reliably prevented from being carried in. As a result, it is possible to reliably prevent a decrease in yield and a decrease in production efficiency due to erroneous input.

  In addition, when one of the second machine tools 5 is left open for a long time with one of the open / close doors 3 being opened, the machine tool that has been opened is in a stopped state. The workpiece W being carried in is continuously processed. Therefore, even if the processing of the workpiece W is completed, the open / close door 3 does not open. Therefore, as soon as the open / close door 3 that has been opened in this state is closed, the open / close door 3 of the other second machine tool 5 that has been closed itself opens. For example, when the open / close door 3 of the second machine tool 5a remains open for a long time (for example, 30 seconds or longer), the workpiece W carried into the downstream second machine tools 5b, 5c is The opening / closing door 3 remains closed by the control means 7 despite the completion of processing. Accordingly, when the opening / closing door 3 of the second machine tool 5a is closed, the opening / closing doors 3 of the second machine tools 5b and 5c downstream of the second machine tool 5a are opened. As a result, the worker 11 erroneously carries the workpiece W carried out from the second machine tool 5a into another second machine tool 5b or 5c that performs the same machining downstream of the second machine tool 5a. Since there is a possibility, the same processing may be performed on the workpiece W repeatedly.

  In order to prevent the above situation, the control means 7 further includes an erroneous insertion prevention timer 8. Thereby, it can prevent that the opening / closing door 3 of the some 2nd machine tool 5 which performs the same process opens / closes continuously. That is, even if one of the second machine tools 5a, 5b, 5c is closed, another second machine tool (until a predetermined time elapses after the door is closed (or after the machining start switch is pressed)). For example, if the second machine tool 5a is closed, the second machine tool 5b or the second machine tool 5c is opened. If the second machine tool 5b is closed, the door 3 of the second machine tool 5c is opened. Do not door. Therefore, it is possible to prevent the worker 11 from erroneously carrying the workpiece W into the second downstream machine tool 5 that performs the same machining. In addition, when the operator 11 sets the erroneous insertion prevention timer 8 in accordance with the time for which the processing line 1 goes around, the opening / closing door 3 can be opened in accordance with the time for the operator 11 to go around the processing line 1. . Therefore, the worker 11 can move the workpiece W without mistaking the place where the workpiece W is carried in / out. Here, the predetermined time means, for example, the time required for the operator to pass through a plurality of machine tools performing the same processing.

  FIG. 6 shows a state after 10 seconds from the state of FIG. After the processing of the first step of the workpiece W4 is completed, the worker 11 unloads the workpiece W4 from the first machine tool 4, and newly loads the workpiece W5 into the first machine tool 4, Processing of the first step of the workpiece W5 is started. Next, the worker 11 conveys the workpiece W4 unloaded from the first machine tool 4 to the second machine tool 5a. At this time, since the processing of the second step of the workpiece W1 has been completed, the open / close door 3 of the second machine tool 5a is opened. The workpiece W1 is unloaded from the second machine tool 5a, and the workpiece W4 moved from the first machine tool 4 is loaded into the second machine tool 5a to start the second process of the workpiece W4. To do. Finally, the workpiece W1 carried out from the second machine tool 5a is conveyed to the third machine tool 6, and the workpiece W1 is carried into the machining space 9 of the third machine tool 9, so that the workpiece W1 is removed. Processing into a product shape (third step). At this time, since the workpieces W2 and W3 in the other second machine tools 5b and 5c are being processed, the open / close door 3 is closed. For this reason, the operator 11 does not mistake the destination of the workpiece W1.

  FIG. 7 shows a state after 10 seconds have elapsed from the state of FIG. After the processing of the first step of the workpiece W5 is completed, the worker 11 unloads the workpiece W5 from the first machine tool 4, and newly loads the workpiece W6 to the first machine tool 4. Processing of the first step of the workpiece W6 is started. Next, the worker 11 conveys the workpiece W5 unloaded from the first machine tool 4 to the second machine tool 5b. Since the processing in the second step of the workpiece W2 has been completed, the open / close door 3 of the second machine tool 5b is opened. The workpiece W2 is unloaded from the second machine tool 5b, and the workpiece W5 moved from the first machine tool 4 is loaded into the second machine tool 5b, and machining of the workpiece W5 in the second step is started. To do. Finally, the workpiece W2 unloaded from the second machine tool 5b is conveyed to the third machine tool 6. At this time, the processing of the workpiece W1 of the third machine tool 6 is also completed, and the open / close door 3 is opened. For this reason, since the worker 11 can only carry the workpiece W2 into the third machine tool 6 in which the open / close door 3 is opened, the workpiece 11 can be reliably conveyed to the third machine tool 6. Can do. The workpiece W1 is unloaded from the third machine tool 6, and the workpiece W2 is loaded into the third machine tool 6 to process the workpiece W2 in the third step. In addition, the workpiece W <b> 1 unloaded from the third machine tool 6 is formed into a product shape through all the processes on the processing line 1, and is conveyed outside the processing line 1. Thereafter, the workpiece W that has completed the third process, which is the final process of the processing line 1, is sequentially conveyed out of the processing line (not shown).

  FIG. 8 shows a state after 10 seconds have elapsed from the state of FIG. After the processing of the first step of the workpiece W6 is completed, the worker 11 unloads the workpiece W6 from the first machine tool 4, and newly loads the workpiece W7 to the first machine tool 4. Processing of the first step of the workpiece W7 is started. Next, the worker 11 conveys the workpiece W6 unloaded from the first machine tool 4 to the second machine tool 5c. At this time, the processing of the second step of the workpiece W3 is completed, and the opening / closing door 3 of the second machine tool 5c is opened. The workpiece W3 is unloaded from the second machine tool 5c, and the workpiece W6 moved from the first machine tool 4 is loaded into the second machine tool 5c, and machining of the workpiece W6 in the second step is started. To do. Finally, the workpiece W3 carried out from the second machine tool 5c is conveyed to the third machine tool 6. Processing of the workpiece W2 of the third machine tool 6 has been completed, and the open / close door 3 is in an open state. The worker 11 unloads the workpiece W2 from the third machine tool 6 and loads the workpiece W3 into the third machine tool 6 to start the third process of the workpiece W3. On the other hand, the workpiece W2 carried out from the third machine tool 6 is conveyed out of the processing line 1 (not shown) in the same manner as described above.

  FIG. 9 shows a state after 10 seconds from the state of FIG. After the processing of the first step of the workpiece W7 is completed, the worker 11 unloads the workpiece W7 from the first machine tool 4, and newly loads the workpiece W8 into the first machine tool 4. Processing of the first step of the workpiece W8 is started. Next, the operator 11 conveys the workpiece W7 carried out from the first machine tool 4 to the second machine tool 5a. Processing of the workpiece W4 in the second step is completed, and the opening / closing door 3 of the second machine tool 5a is opened. The workpiece W4 is unloaded from the second machine tool 5a, and the workpiece W7 moved from the first machine tool 4 is loaded into the second machine tool 5a, and machining of the workpiece W7 in the second step is started. To do. Finally, the workpiece W4 carried out from the second machine tool 5a is conveyed to the third machine tool 6. Processing of the third machine tool 6 has been completed, and the open / close door 3 is in an open state. On the other hand, since the second machine tools 5b and 5c are processing the workpieces W5 and W6, the open / close door 3 is in a closed state. For this reason, since the worker 11 can only carry the workpiece W4 into the third machine tool 6 in which the opening / closing door 3 is opened, the workpiece 11 can be reliably conveyed to the third machine tool 6. Can do. The workpiece W3 is unloaded from the third machine tool 6, and the workpiece W4 is loaded into the third machine tool 6, and the workpiece W4 is processed in the third step. Further, the workpiece W3 carried out from the third machine tool 6 is transported outside the processing line 1 (not shown) in the same manner as described above.

  FIG. 10 shows a state after 10 seconds have elapsed from the state of FIG. After the processing of the first step of the workpiece W8 is completed, the worker 11 unloads the workpiece W8 from the first machine tool 4. In the present embodiment, the workpiece W8 is the last workpiece. Therefore, the first machine tool 4 is in a state where the open / close door 3 remains open after the processing is completed. The worker 11 transports the workpiece W8 unloaded from the first machine tool 4 to the second machine tool 5b. At this time, the processing of the second process of the workpiece W5 has been completed, and the open / close door 3 of the second machine tool 5b is opened. The workpiece W5 is unloaded from the second machine tool 5b, and the workpiece W8 moved from the first machine tool 4 is loaded into the second machine tool 5b, and machining of the workpiece W8 in the second step is started. To do. Further, the workpiece W5 carried out from the second machine tool 5b is conveyed to the third machine tool 6. At this time, the processing of the third machine tool 6 has been completed, and the open / close door 3 is in an open state. On the other hand, the first machine tool 4 is also in a state where the open / close door 3 is opened as described above. However, since the first machine tool 4 is located upstream of the processing line 1, the operator 11 does not flow the work line 1 backward through the processing line 1. For this reason, the worker 11 carries the workpiece W5 into the downstream machine tool 2 where the open / close door 3 of the machine tool 2 is open. Thereby, the workpiece W5 can be reliably conveyed to the third machine tool 6. The workpiece W4 is unloaded from the third machine tool 6, and the workpiece W5 is loaded into the third machine tool 6 to start the third process of the workpiece W5. The workpiece W4 carried out from the third machine tool 6 is transported out of the processing line 1 (not shown) as described above.

  FIG. 11 shows a state after 10 seconds have elapsed from the state of FIG. Since the workpiece W is not carried into the first machine tool 4, the open / close door 3 is stopped in the open state. The worker 11 moves together with the cart 12 to the second machine tool 5c where the workpiece W6 is carried in, and carries the workpiece W6 out of the second machine tool 5c. As a result, the machining space 9 of the second machine tool 5c becomes empty, but the open / close door 3 of the second machine tool 5c is closed by the control means 7 provided in the second machine tool 5. Next, the workpiece W6 taken out from the second machine tool 5c is conveyed to the third machine tool 6. At this time, since the processing of the third step of the workpiece W5 has already been completed, the open / close door 3 of the third machine tool 6 is opened. The worker 11 unloads the workpiece W5 processed into the product shape from the third machine tool 6, places it on the cart 12, and transfers the workpiece W6 conveyed from the second machine tool 5c to the third machine tool 6. It carries in and starts the process of the 3rd process of the workpiece W6. Finally, the workpiece W5 processed into the product shape is conveyed outside the processing line 1 (not shown).

  FIG. 12 shows a state after 10 seconds have elapsed from the state of FIG. At this time, the processing of the workpiece W7 carried into the second machine tool 5a is completed. The worker 11 moves together with the cart 12 to the second machine tool 5a, unloads the workpiece W7 from the second machine tool 5a, places the workpiece W7 on the cart 12, and conveys it to the third machine tool 6 that performs the third process. . Thereby, the machining space of the second machine tool 5a becomes empty. However, the opening / closing operation of the opening / closing door 3 of the second machine tool 5 is controlled by the control means 7 in the second machine tool 5. Therefore, even if the workpiece W is not carried into the machining space 9 of the second machine tool 5a, the open / close door 3 of the second machine tool 5a is closed. The workpiece W7 taken out from the second machine tool 5a is conveyed to the third machine tool 6 in order to perform the third process. At this time, the open / close doors 3 of the other second machine tools 5b and 5c arranged next to the second machine tool 5a are closed. On the other hand, in accordance with the timing at which the workpiece W7 is conveyed, the processing of the workpiece W6 is completed, and the open / close door 3 of the third machine tool 6 is opened. Thereby, the operator 11 can prevent mistaking the conveyance destination of the workpiece W7. The worker 11 unloads the workpiece W6 processed into the product shape from the third machine tool 6, loads the workpiece W7 conveyed from the second machine tool 5a, and sets the workpiece W7 in the first shape. Start processing in 3 steps. The workpiece W6 processed into the product shape is conveyed outside the processing line 1 (not shown).

  FIG. 13 shows a state after 10 seconds have elapsed from the state of FIG. At this time, the processing of the workpiece W8 set on the second machine tool 5b is completed. The worker 11 moves to the second machine tool 5 b together with the cart 12, unloads the workpiece W 8 from the second machine tool 5 b, places it on the cart 12, and conveys it to the third machine tool 6. At this time, the machining space 9 of the second machine tool 5 is completely empty. However, since the opening / closing operation of the opening / closing door 3 of the second machine tool 5b is controlled by the control means 7, the opening / closing door 3 of the second machine tool 5b is closed after the workpiece W8 is unloaded. On the other hand, in accordance with the timing at which the workpiece W8 is conveyed, the processing of the workpiece W7 is completed, and the open / close door 3 of the third machine tool 6 is opened. Therefore, the operator 11 can move to the third machine tool 6 without mistakenly conveying the workpiece W8. The workpiece W7 processed into the product shape is unloaded from the third machine tool 6, and the workpiece W8 is loaded into the third machine tool 6 to start the third process of the workpiece W8. . The workpiece W7 processed into the product shape is conveyed outside the processing line 1 (not shown).

  When 10 seconds elapses from the state of FIG. 13, the third process of the workpiece W8 is completed, and the open / close door 3 of the third machine tool 6 is opened (see FIG. 14). The worker 11 unloads the workpiece W8 from the third machine tool 6 and places it on the cart 12 to convey it outside the processing line 1 to complete the processing of all the workpieces W1 to W8. When the detection means 10 detects that all the workpieces W have been unloaded from the machining space 9 of the second machine tool carriers 5a, 5b, 5c, the control door 7 opens the door 3 of the second machine tool 5. Are simultaneously opened to reset to the state of FIG. That is, the detection means 10 serves as an on / off switch for starting control of the control means 7. As described above, the control means 7 is activated when the detection means 10 detects that the workpiece W has been carried into the machining space 9 of all the second machine tools 5, and the second machine tool 5 is opened and closed. The opening / closing control of the door 3 is started. On the other hand, when the detection means 10 detects that all the workpiece W has been carried out from the machining space 9 of the second machine tool 5, the control means 7 ends the opening / closing control of the open / close door 3, and the second machine tool The open / close doors 3 of the machine 5 are opened simultaneously.

  Further, in this embodiment, when the detection means 10 detects that the workpiece W has been carried into all of the second machine tools 5, the control means 7 is activated to control the opening / closing operation of the open / close door 3. However, it is not limited to this. For example, when the processing line 1 is started up, the control means 7 is activated, or when the workpiece W is carried into all the second machine tools 5 except for one second machine tool 5 (see FIG. 5). ) May activate the control means 7. Further, the trigger for starting the control means 7 is not limited to the detection means 10, but for example, although not shown, the machining start switch of the second machine tool 5 and the control means 7 are interlocked and controlled by using the machining start switch as a trigger. The means 7 may be activated.

  In the present embodiment, the processing line 1 including five machine tools 2 is shown as an example, but the present invention is not limited to this, and the number of machine tools 2 can be changed as appropriate.

  In the present embodiment, the control means 7 is provided in the three machine tools 2 as an example. However, the present invention is not limited to this and may be provided in two or more machine tools 2.

  Moreover, the kind of the machine tool 2 which comprises the processing line 1 can also be selected suitably. For example, NC machine tools such as NC lathes and NC milling machines, press machines, cutting machines and the like are widely used in the industry, and can be suitably applied as long as the opening / closing doors of machine tools automatically open and close.

  The set time of the erroneous input prevention timer 8 may be appropriately changed in consideration of the length of the processing line 1, the time required for loading / unloading the workpiece W, the time required for checking the quality of the workpiece, and the like.

DESCRIPTION OF SYMBOLS 1 Processing line 2 Machine tool 3 Opening / closing door 4 1st machine tool 5 2nd machine tool (5a, 5b, 5c)
6 Third machine tool 7 Control means 8 False insertion prevention timer 9 Processing space 10 Detection means 11 Worker 12 Cart W Workpiece (W1-W5)

Claims (3)

Opening and closing doors that automatically open when processing of the workpiece is completed, a plurality of machine tools that perform the same processing on the workpiece, and a control means for controlling the opening and closing of the opening and closing doors of the plurality of machine tools In the processing line that has
The control means restricts the opening of the one machine tool if the opening / closing door of any one of the other machine tools is open when the processing of the workpiece by the one machine tool is finished. A processing line.   The processing line according to claim 1, wherein the control unit allows the door of the one machine tool to be opened after a predetermined time has elapsed since the doors of all the other machine tools have been closed.   3. The processing line according to claim 1, wherein the control means is provided with detection means for detecting the presence or absence of a workpiece in the machine tool.

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