JP6695471B1 - Abrasion detection method for die slide device of vertical injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wear detection method for a die slide device capable of accurately detecting wear of a slide mechanism of a slide table. A slide table (10) of a mold slide device (2) is provided on a fixed platen (3) by a slide mechanism (12) including a rail (17) and a slider block (18). The slider block (18) is provided with a spring body (19), the slider block (18) floats from the fixed platen (3) when the mold is opened, and the slide table (10) is in close contact with the fixed platen (3) when the mold is clamped. To do. The wear detection method includes a preparation process and a monitoring process. In the preparation step, the height position of the slide table (10) when the mold is opened is measured for each mold and recorded as the standard position for each mold. The monitoring step measures the height position of the slide table (10) during mold opening of the molding cycle and compares it with the standard position of the corresponding mold. When the deviation reaches a predetermined value, it is determined that the slide mechanism (12) is worn. [Selection diagram]

Description

  The present invention includes a slide table that slides on a fixed plate of a vertical injection molding machine, and a lower mold attached to the slide table is slid to align with an upper mold attached to an upper movable plate. The present invention relates to a wear detecting method for a mold slide device which is configured to be alternately moved to a tightening position and a non-aligned retracted position.

  A vertical injection molding machine is well known in the art, and is roughly configured by a mold clamping device that vertically opens and closes a pair of molds, and an injection device that injects molten resin into the molds that have been clamped. When the mold clamping device is a toggle type, the mold clamping device includes a fixed platen, an upper movable platen, a lower movable platen, a plurality of tie bars, and a toggle mechanism. The fixed plate is fixed to the top plate of the bed, and the tie bar penetrates the fixed plate. An upper movable plate is provided at the upper ends of these tie bars, and a lower movable plate is provided at the lower ends thereof. A toggle mechanism is provided between the lower movable platen and the fixed platen, and when the toggle mechanism is driven, the upper movable platen and the lower movable platen are driven with respect to the fixed platen. That is, the mold is opened and closed. The toggle mechanism and the lower movable platen are housed in the bed, and the injection device is provided above the upper movable platen. The upper mold is attached to the upper movable plate, and the lower mold is attached to the fixed plate. When the mold clamping device is driven, the mold is opened and closed.

JP-A-5-337977 JP 2002-1756 A

  A vertical injection molding machine is often provided with a mold moving mechanism for moving a lower mold, and as the mold moving mechanism, for example, a turntable rotating on a fixed platen is well known. The lower mold is placed on a turntable, rotated, and moved to a mold clamping position that is aligned with the upper mold and a retracted position that is not aligned with the upper mold. As a mold moving mechanism, mold slide devices such as those described in Patent Documents 1 and 2 are also known. The mold slide device includes a slide table that linearly slides on a fixed platen. The slide table is driven by a drive mechanism such as a ball screw mechanism and a servo motor, and a lower die is placed on the slide table. By sliding the slide table, the lower mold moves to a mold clamping position in which the lower mold is aligned with the upper mold and a retracted position in which the mold is not aligned. The lower die moves to the retracted position when the molded product is taken out or when the insert product is inserted in insert molding. Also, in the maintenance of the mold, the lower mold is moved to the retracted position.

  The mold slide device is excellent in that it is possible to easily take out a molded product and insert an insert product in insert molding in a vertical injection molding machine, and to easily perform mold maintenance. Therefore, there is no particular problem with the mold slide device. However, in the mold slide device, the slide table frequently slides on the fixed plate, so that the slide mechanism is worn. There is no way to detect this wear. When a so-called LM Guide (registered trademark) including a rail and a slider block that slides on the rail is used as the sliding mechanism, the following configuration is adopted. First, flange portions are formed at one end and the other end of the slide table. A pair of rails are provided on the fixed plate so that the distance between the pair of flanges is equal. Then, they are mounted on a pair of slider blocks that slide on these rails. A predetermined spring body is built into the slider block, and this spring body has a relatively large elastic force, so even if the lower die is provided on the slide table, the slide table opens a predetermined gap from the fixed platen. Float up. Therefore, the slide table can be slid smoothly by the slider block. On the other hand, when the slide table is set at the mold clamping position and the upper mold and the lower mold are clamped, the spring body is compressed and the slide table comes into contact with the stationary platen. As a result, the mold clamping force is properly applied. By the way, such a slide mechanism is worn by long-term use. The slide mechanism may be replaced as appropriate, but if the wear is not noticed and the replacement is delayed, the slide table will eventually be unable to be properly lifted from the fixed platen. If the slide table is slid in this state, the slide table and the fixed plate will be worn. By the way, if the clearance is monitored when the mold clamping force is not generated, it may be possible to detect the wear of the slide mechanism. However, the gap is also affected by the weight of the lower mold. Furthermore, the position of the center of gravity differs for each lower mold depending on the shape of the cavity, which also affects the gap. That is, there is a problem that the wear cannot be properly monitored even by simply monitoring the gap.

  An object of the present invention is to provide a wear detecting method for detecting wear of a mold slide device of a vertical injection molding machine, which solves the above-mentioned problems, and more specifically, a lower side to be attached. Even if the dies are replaced and different lower dies are attached, the wear of the slide mechanism of the slide table can be detected accurately, so that the slide mechanism can be replaced appropriately, and the fixed plate and slide table are not damaged. An object of the present invention is to provide a method for detecting wear of a mold slide device.

  In order to achieve the above object, the present invention is directed to a die slide device provided with a predetermined slide mechanism among die slide devices provided with a slide table that slides on a fixed plate, and wear of the slide mechanism is targeted. To detect. Specifically, the slide mechanism is intended for one that includes a rail and a slider block that slides while being guided by the rail. A mold is placed on the slide table, and when the mold is opened, a spring body provided in the slider block opens a predetermined gap from the fixed platen to float and slide. On the other hand, the slide table comes into close contact with the fixed plate during mold clamping. The wear detection method is composed of a preparatory step that is performed in advance and a monitoring step that is performed for each molding cycle. In the preparation step, the height position of the slide table when the mold is opened is measured for each mold and recorded as a standard position for each mold. The monitoring process measures the height position of the slide table when the mold is opened in the molding cycle, compares it with the standard position corresponding to the mold attached to the slide table, and when the deviation reaches a predetermined size, slide mechanism Is judged to be worn.

Thus, in order to achieve the above-mentioned object, the invention according to claim 1 is slidably provided on the fixed plate through a predetermined slide mechanism, and the mold is placed thereon. In a mold slide device of a vertical injection molding machine equipped with a slide table, there is provided a wear detecting method for detecting wear of the slide mechanism, wherein the slide mechanism includes a rail and a slider block that slides while being guided by the rail. When the mold is opened, a predetermined spring body provided in the slider block floats the slide table from the fixed plate with a predetermined gap, and when the mold is clamped, the slide table comes into close contact with the fixed plate. The wear detection method includes a preparatory step to be performed in advance and a monitoring step to be performed for each molding cycle.The preparatory step measures the height position of the slide table at the time of mold opening for each mold. The height of the slide table is measured when the mold is opened in the molding cycle, and the standard position corresponding to the mold attached to the slide table is recorded. In comparison with the above, when the deviation reaches a predetermined value, it is determined that the slide mechanism is worn, and the method is configured as a wear detection method for a die slide device.
The invention according to claim 2 is the wear detecting method according to claim 1, wherein the height position of the slide table is measured at each of a plurality of spaced positions on the slide table. This is configured as a wear detection method for a mold slide device.

  INDUSTRIAL APPLICABILITY As described above, the present invention is a vertical injection molding provided with a slide table which is slidably provided on a fixed plate through a predetermined slide mechanism and on which a mold is placed. It is configured as a wear detection method for detecting wear of a slide mechanism in a mold slide device of a machine. The slide mechanism is composed of a rail and a slider block that slides while being guided by the rail, and when the slide table is opened, a predetermined spring body provided in the slider block opens a predetermined gap from the fixed platen and floats the die. When tightened, it comes into close contact with the fixed platen. In such a die slide device, the method for detecting wear of the slide mechanism includes a preparatory step to be performed in advance and a monitoring step to be performed for each molding cycle. In the preparation step, the height position of the slide table when the mold is opened is measured for each mold and recorded as the standard position for each mold. Then, the monitoring process measures the height position of the slide table when the mold is opened in the molding cycle, compares it with the standard position corresponding to the mold attached to the slide table, and slides when the deviation reaches a predetermined size. It is configured to determine that the mechanism is worn. Since the present invention is configured in this manner, the presence or absence of wear of the slide mechanism is checked for each molding cycle, and if the allowable amount is exceeded, it can be determined that there is wear. As a result, the slide mechanism can be replaced appropriately, and there is no risk of damaging the fixed platen or slide table. By the way, when the slide table is opened, the spring body provided in the slider block floats up from the fixed platen. However, the floating gap slightly changes depending on the weight of the attached mold. In the present invention, the standard position of each mold is recorded as a standard position, and the height position of the slide table measured when the mold is opened in each molding cycle is compared with the standard position corresponding to the currently installed mold. Therefore, even if the mold attached to the slide table is replaced, the wear of the slide mechanism can be detected with high accuracy. According to another invention, the height position of the slide table is configured to be measured at a plurality of spaced positions on the slide table. Since the position of the center of gravity of the mold changes depending on the shape of the cavity, the floating of the slide table may slightly tilt when the mold is opened, depending on the mold to be mounted. Even in such a case, since the height positions are measured at two or more positions separated from each other on the slide table, each height position is recorded as one set of standard positions, and each height position is recorded. The wear of the slide mechanism can be surely detected by comparing the height positions of two positions measured at 3 points or the height positions of three positions with these standard positions. In general, two sets of slide mechanisms are generally provided, but in some cases only one slide mechanism may be worn. According to the present invention, since the height positions are measured at a plurality of spaced positions on the slide table, even if only one of the slide mechanisms is worn, this can be reliably detected.

It is a perspective view showing a mold slide device according to an embodiment of the present invention, which is provided in a vertical injection molding machine. It is a front sectional view showing a fixed plate of a vertical injection molding machine and a slide table of a mold slide device according to the present embodiment, in which (A) is a mold opening time and (B) is a mold clamping time. FIG. 3 is a front cross-sectional view of a fixed plate and a slide table in FIG.

  The present embodiment will be described below. The mold slide device 2 according to this embodiment is provided in the vertical injection molding machine 1 according to this embodiment, as shown in FIG. As is well known, the vertical injection molding machine 1 includes a mold clamping device, an injection device, and the like. In FIG. 1, only a fixed plate 3 and tie bars 4, 4, ... Which are part of the mold clamping device are shown. There is. A top plate 6 is provided on a bed that supports the vertical injection molding machine, and a fixed plate 3 is fixed to the top plate 6. The tie bars 4, 4, ... Are inserted through the fixing plate 3 having four through holes. Although not shown in FIG. 1, the lower end of the tie bar is a lower movable platen provided in the bed, and the upper end thereof is an upper movable platen disposed above the fixed platen 3. It is fixed. When the toggle mechanism provided between the fixed platen 3 and the lower movable platen is driven, the upper movable platen moves up and down with respect to the fixed platen 3 to open and close the mold.

  The mold slide device 2 includes a slide table 10 configured to slide on a fixed plate 3, an expansion table 11 provided on the top plate 6 and having the same height as the fixed plate 3, and a slide on the fixed plate 3. A slide mechanism 12 that slidably supports the table 10 and a drive mechanism 13 that drives the slide table 10 are configured. The upper surface of the slide table 10 is formed in a rectangular shape, and flange portions 15, 15 are formed at one end and the other end as shown in FIG. 2 (A). The slide table 10 is supported on the flange portions 15 and 15 by a slide mechanism 12 described below. As shown in FIG. 1, the drive mechanism 13 is composed of a ball screw mechanism 21 and a motor 22. When the ball screw 23 of the ball screw mechanism 21 is rotated by the motor 22, the ball nut screwed into the ball screw 23 is axially driven, and the slide table 10 can be slid via the bracket 24. The ball nut is housed in the bracket 24 and is not shown in FIG.

  As shown in FIG. 2A, the mold slide device 2 according to the present embodiment employs a pair of slide mechanisms 12, 12. The slide mechanisms 12 and 12 are composed of rails 17 and 17 and slider blocks 18 and 18 which are slid by being guided by the rails 17 and 17. Although not shown in the figure, bearings are provided in the slider blocks 18, 18 so that the rails 17, 17 can be slid smoothly. As shown in FIG. 1, the pair of rails 17 and 17 are provided across the fixed platen 3 and the extension table 11, and the flange portions 15 of the slide table 10 are provided on the slider blocks 18 and 18, respectively. 15 are provided. Spring bodies 19, 19 are built in the slider blocks 18, 18. Alternatively, the spring bodies 19, 19 are provided externally. The bottoms of the slide table 10 are floated above the fixed platen 3 by a predetermined gap d by the spring bodies 19, 19. On the other hand, when a downward pressing force acts on the slide table 10 during mold clamping, the spring bodies 19, 19 are compressed and the bottom surface of the slide table 10 comes into contact with the fixed platen 3.

  The mold slide device 2 according to the present embodiment is provided with a pair of sensors 25, 25 for measuring the height position of the slide table 10. In this embodiment, the sensors 25, 25 are laser displacement sensors. The laser displacement sensor irradiates a marker with a laser and measures the position of the marker from the reflected light thereof, and the position can be measured with high accuracy. The markers 27, 27 are provided on one and the other ends of the slide table 10, and the sensor bodies 26, 26 are provided on the top plate 6 so as to face the markers 27, 27. The height position of the slide table 10 measured by the sensors 25, 25 is input to a controller (not shown) of the vertical injection molding machine 1.

  A mold 29 is placed on the slide table 10 of such a mold slide device 2. The mold 29 is replaced according to the molded product. Every time a molding cycle is performed in the vertical injection molding machine 1, the slide table 10 is slid to move the mold 29 toward the expansion table 11. This makes it easier to take out the molded product. Alternatively, it is easy to insert an insert product in insert molding. Since the slide table 10 is slid in each molding cycle in this manner, the slide mechanisms 12 and 12 are worn due to long-term operation. Therefore, in the mold slide device 2 according to the present embodiment, wear of the slide mechanisms 12, 12 is detected as follows.

  The wear detecting method includes a preparatory step that is first performed only once and a monitoring step that is performed for each molding cycle. The preparation process is performed when the slide mechanisms 12, 12 are new and have not yet been worn. The mold 29 is attached to the slide table 10 and the mold table is opened to measure the height position of the slide table 10. Since there are two sensors 25, 25, two height positions are measured. These are set as the first and second standard positions and are recorded in the controller in association with the mold 29. If there are other molds to be replaced in the vertical injection molding machine 1, those molds are also attached to the slide table 10 and the first and second standard positions are similarly measured. Then, it is recorded in the controller in association with each mold. That is, the controller records the first and second standard positions of all the molds that may be mounted in the vertical injection molding machine 1.

  The monitoring process is performed every molding cycle, but specifically, it is performed when the mold is opened. When the mold is opened, the height position of the slide table 10 is measured by the two sensors 25, 25, which are the first and second measurement positions. Based on the mold currently attached to the slide table 10, the corresponding first and second standard positions recorded in the controller are read out. The first and second measurement positions are respectively compared with the first and second standard positions to evaluate the deviation from the first and second standard positions, that is, the deviation. If the deviation exceeds a predetermined threshold value, it is determined that the slide mechanism 12 is worn. This makes it possible to replace the slide mechanism 12 at an early stage and prevent the die slide device 2 and the fixed platen 3 from being damaged. Note that the slide mechanism 12 was worn even if only one of the deviation between the first standard position and the first measurement position and the deviation between the second standard position and the second measurement position exceeded the threshold value. However, it may be determined that the slide mechanism 12 is worn when both the threshold values are exceeded. The wear of the slide mechanism 12 detected by the wear detecting method according to the present embodiment includes not only wear of the rail 17 and the slider block 18, but also deterioration of the spring body 19.

  The present embodiment can be variously modified. For example, the sensor 25, 25 and the markers 27, 27 have been described as being provided in the number of two in each of the present embodiments, but may be a plurality of three or more, or one each. Good. For example, four sensors 25, 25 and four markers 27, 27 are provided, the height positions of the four corners of the slide table 10 are measured, and the first to fourth standard positions are recorded. The height position may be measured for each and compared. This makes it possible to detect wear with higher accuracy.

1 Vertical Injection Molding Machine 2 Mold Sliding Device 3 Fixed Plate 6 Top Plate 10 Sliding Table 11 Expansion Table 12 Sliding Mechanism 17 Rail 18 Slider Block 19 Spring Body 21 Ball Screw Mechanism 22 Motor 25 Sensor 26 Sensor Body 27 Marker 29 Mold

Claims (2)

A mold slide device of a vertical injection molding machine, comprising a slide table, which is slidably provided on a fixed platen via a predetermined slide mechanism, and on which a mold is placed, A wear detecting method for detecting wear of a slide mechanism,
The slide mechanism includes a rail and a slider block that slides while being guided by the rail.
When the slide table is opened, the slider is floated by a predetermined spring body provided on the slider block with a predetermined gap from the fixed plate, and when the mold is clamped, the slide table is closely attached to the fixed plate.
The wear detection method comprises a preparatory step to be carried out in advance and a monitoring step to be carried out for each molding cycle,
In the preparation step, the height position of the slide table at the time of mold opening is measured for each mold and recorded as a standard position for each mold,
The monitoring step measures the height position of the slide table when the mold is opened in the molding cycle, and compares it with the standard position corresponding to the mold attached to the slide table so that the deviation has a predetermined magnitude. A method of detecting wear of a mold slide device, characterized in that when the number of slides reaches the limit, it is determined that the slide mechanism is worn.   The wear detecting method according to claim 1, wherein the height position of the slide table is measured at each of a plurality of spaced positions on the slide table.

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