JP3860047B2 - Gate cut device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gate cutting device for cutting a gate protruding from a flat portion of a resin molded product.
[0002]
[Prior art]
Examples of the cutting device for cutting the gate protruding from the flat portion of the resin molded product include (1) Japanese Patent Application Laid-Open No. 61-102226 “Molded Product Extraction Device” and (2) Japanese Utility Model Publication No. 63-192016. There are those shown in "Gate Cut Device" and (3) Japanese Utility Model Publication No. 1-178928 "Gate Cut Device for Resin Molded Products".
[0003]
According to FIG. 2 of the publication, the apparatus for taking out a molded article of (1) above is configured to remove the molded article 1 with the hand 4 at the tip of the Cartesian coordinate robot 7 (the symbols are those used in the publication. The same applies hereinafter). The air nipper 8 is gripped and moved, and the gate 12 (see FIG. 1) of the molded product 1 is sequentially cut by the air nipper 8.
[0004]
The gate cut device 10 of the above (2) is a part of the injection molding equipment 60 shown in FIG. 7 of the same publication, and takes out the molded product 1 from the mold pressurizer 62 of the injection molding equipment 60 by the take-out machine 70. The molded product 1 is placed on the gate cut device 10 by the traverser 66.
In the gate cut device 10, as shown in FIG. 1 of the same publication, the molded product 1 is set on the receiving jig 24 while being guided by the guide 22 by the traverser 66 (see FIG. 7). After the clamping member 15 is pressed and clamped by the receiving jig 24 and the clamping member 15, the gate 4 of the molded product 1 is cut by the gate cutting blade 30 attached to the piston 27 of the lower rodless cylinder 25. In addition, the cutting trace can be made smooth, and overcutting and uncutting can be prevented.
[0005]
According to FIG. 2 of the publication, the gate cut device of the above (3) grips the gate 13a of the resin molded product 13 with the gripper 8 provided in the robot hand 3a of the robot 3, and the gate 13a It is cut by the adjacent nipper 6, and the gate 13a can be prevented from being scattered.
[0006]
[Problems to be solved by the invention]
The molded product take-out device of the above (1) has an advantage of performing gate cutting in the vicinity of the injection molding machine 9, but there are cases where the air nipper 8 cannot be arranged in a large molded product due to layout restrictions. Further, depending on the arrangement of the Cartesian coordinate robot 7 and the air nipper 8, it is necessary to rotate the molded product, which causes layout restrictions such as interference with the injection molding machine 9.
[0007]
The gate cut device 10 of the above (2) is configured such that the molded product 1 is set on the receiving jig 24 by the traverser 66, and the set molded product 1 is clamped by the jig 24 and the clamping member 15. 24 and the clamping member 15 are exclusive members that can be used only for the molded product 1. Therefore, it is necessary to manufacture a receiving jig and a clamping member for each type of molded product, and the equipment cost of the gate cut device increases.
[0008]
In the gate cutting device of (3), only a shaft type (shaft shape) gate can be cut, and a flat and long type gate cannot be cut.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a gate cut device that suppresses equipment costs and eliminates excessive cutting and uncut gates.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, in a gate cut device for a resin molded product in which a gate extends vertically from a flat portion, the gate cut device includes upper and lower rolls sandwiching the upper and lower surfaces of the flat portion. A roll holder that rotatably supports the upper and lower rolls, a grip portion formed on the roll holder, and a cutter blade extended from the roll holder to cut the gate.
[0011]
The operator grasps the grip portion, sandwiches the upper and lower surfaces of the flat portion with the upper and lower rolls, and starts cutting the gate. The cutter blade moves while following the upper surface with the upper and lower rolls as a reference, and cuts the gate. Therefore, no jigs are required to hold the resin molded product, and the resin molded product has a different shape. There is no need to manufacture many types of holding jigs every time, so that versatility is increased and equipment costs can be reduced.
Further, the cutter blade cuts the gate while following the upper surface of the flat portion by the upper and lower rolls, so that the gate is not cut too much or left uncut.
[0012]
The gate cut device for a resin molded product having a gate extending vertically from the flat portion according to claim 2, wherein the gate cut device includes a lower roll along the lower surface of the flat portion, and rotatably supports the lower roll. And a connecting portion for connecting the roll holder to the robot, and a cutter blade extending from the roll holder to cut the gate.
[0013]
The flat part is sandwiched between the cutter blade and the lower roll, and both the cutter blade and lower roll in the sandwiched state are moved by the robot to cut the gate, so that the flat part can be forced to follow based on the position of the cutter blade. It is not necessary to provide a dedicated jig for positioning and fixing the resin molded product.
Further, since the flat portion is sandwiched between the cutter blade and the lower roll and the flat portion is forced to follow based on the position of the cutter blade, there is no excessive cutting or uncut portion of the gate extending vertically from the flat portion.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a gate cut device according to the present invention. A gate cut device 10 is for manually cutting a gate of a resin molded product, and a grip portion 12 that an operator grips on one side of a main body member 11. The roll holder 13 is integrally provided on the other side, the upper and lower rolls 14 and 15 are rotatably attached to the roll holder 13, and the cutter blade 16 is detachably attached to the other body member 11.
[0015]
The upper roll 14 is composed of an outer peripheral roll body 21 and a bearing member (not shown) built in the roll body 21.
The lower roll 15 is the same as the upper roll 14, and a description thereof is omitted.
[0016]
The cutter blade 16 includes a holding member 23 attached to the main body member 11 and a cutter blade main body 24 fixed to the holding member 23 so as to be replaceable. As the cutter blade 16, it is desirable to use a normal (commercially available) cutter.
[0017]
Next, the operation of the gate cut device will be described.
FIGS. 2A and 2B are operation diagrams of the gate cut device according to the present invention.
In (a), first, the resin molded product 25 is placed on the work table 26. The resin molded product 25 includes a molded product main body 27, a gate 32 extending vertically from the flat portion 31 of the molded product main body 27, a runner 33 connected to the gate 32, and a spool 34 connected to the runner 33. The molded product main body 27 is, for example, an automobile bumper.
[0018]
Subsequently, the gate 32 of the resin molded product 25 placed on the work table 26 is cut. Specifically, the operator 35 holds the gate cutting device 10 in the right hand 36 and starts cutting the gate 32 as indicated by the arrow (1) from the one end 37 to the other end 38 of the gate 32 of the resin molded product 25.
[0019]
In (b), the upper and lower rolls 14, 15 are fitted to the flat portion 31 on the one end 37 (see (a)) side of the gate 32 as shown by the arrow (2) and cut. That is, the operator moves the cutter blade 16 while rolling the upper and lower rolls 14 and 15 with reference to the upper and lower surfaces 41 and 42 of the flat part 31 with the flat part 31 sandwiched between the upper and lower rolls 14 and 15. Then, since the operator's arm and the cutter blade 16 follow the flat portion 31, even if the flat portion 31 bends or deforms within a tolerance, the cutter blade 16 moves away from the flat portion 31 or is flat. It does not bite into the portion 31, and the gate 32 is not left uncut or the surface of the flat portion 31 is not scraped off.
[0020]
As described above, the gate cut device 10 includes the upper and lower rolls 14 and 15 sandwiching the upper and lower surfaces 41 and 42 of the flat portion 31, the roll holder 13 that rotatably supports the upper and lower rolls 14 and 15, Since the grip portion 12 formed on the roll holder 13 and the cutter blade 16 extended from the roll holder 13 to cut the gate 32 are formed, when the gate 32 is cut, the cutter blade 16 is an upper / lower roll. 14 and 15 can cut the gate 32 while following the upper surface 41 of the flat portion 31 as a reference. As a result, there is no need for jigs for positioning and holding the resin molded product 25 with high accuracy, and there is no need to manufacture various types of holding jigs for each resin molded product having a different shape. Can be suppressed.
[0021]
Further, when the gate 32 is cut by the cutter blade 16, the cutter blade 16 cuts the gate 32 while following the upper surface 41 of the flat portion 31 by the upper and lower rolls 14 and 15. Therefore, it is possible to eliminate excessive cutting and uncut portions of the gate 32.
[0022]
Next, another embodiment of the gate cut device according to the present invention will be described.
FIG. 3 is a diagram showing another embodiment. The same components as those in the embodiment shown in FIG.
[0023]
The gate cut device 50 is provided with a connecting portion 52 connected to the robot on one side of the main body member 51 and a cutter blade 16B on the other side, and a roll holder 53 is swingably attached to the side portion of the main body member 51. The lower roll 15 is rotatably attached to the front end of the roll holder 53, and the rod 55 of the cylinder 54 is connected to the rear end.
[0024]
The cutter blade 16B is the same as the cutter blade 16 (see FIG. 1), and it is desirable to use a normal (commercially available) cutter.
The cylinder 54 is a double-action cylinder that supplies compressed air to both sides of the piston, and reciprocates the piston from the compressed air. The support type of the cylinder 54 is a head side flange type, and is a type adopted to connect the head portion 56 of the cylinder 54 to the upper part of the main body member 51 so as to be swingable. Reference numerals 57 and 58 denote compressed air supply ports.
[0025]
When the gate cut device 50 is in the standby state located at the origin, the lower roll 15 is in the standby position indicated by a two-dot chain line, and the compressed air is supplied from the supply port 57 of the cylinder 54 and the rod 55 is moved to the backward limit. The lower roll 15 is set to a standby position indicated by a two-dot chain line. The position of the lower roll 15 indicated by the solid line corresponds to the position when the gate is cut.
[0026]
Here, the lower axis in the figure is a coordinate axis, X is an axis indicating horizontal linear motion, Y is a vertical axis orthogonal to X, and Z is an axis orthogonal to X and Y.
[0027]
FIG. 4 is a side view of an example of an injection molding apparatus provided with a gate cut device according to another embodiment.
The injection molding device 60 includes an injection molding machine 61 that molds the resin molded product 25, a take-out machine 62 that takes out the resin molded product 25 from the injection molding machine 61, and a gate cutting device 50 that cuts the gate 32 of the resin molded product 25. And a robot 63. L indicates the length of the gate 32 of the resin molded product 25.
[0028]
The injection molding machine 61 injects molten resin melted (plasticized) in a cylinder 64 into a cavity of a mold 66 (a fixed mold 67 and a movable mold 68) closed through a nozzle 65. The resin molded product 25 is molded by opening the mold as shown in the figure when the resin is solidified.
[0029]
The take-out machine 62 includes a gripping means 71 for gripping the resin molded product 25 and a moving means 73 having an arm member 72 for holding the gripping means 71, and a gate of the resin molded product 25 at a predetermined position near the robot 63. 32 is held vertically.
In the figure, 74 indicates a cutting start point of the gate 32, and Xs, Ys, and Zs indicate start reference coordinates.
[0030]
Next, the operation of another embodiment will be described.
FIG. 5 is a first operation diagram of another embodiment.
The resin molded product 25 is held by the take-out machine 62. Specifically, the take-out machine 62 is stopped in a state where the cutting start point 74 of the gate 32 coincides with the start reference coordinates Xs, Ys, Zs located in the space near the robot 63.
[0031]
Subsequently, cutting of the gate 32 is started on the stationary take-out machine 62. Specifically, the robot 63 is operated from the standby state as indicated by arrow (3) toward the start reference coordinates Xs, Ys, Zs, and the start reference coordinates Xs, Ys, Zs and the cutting reference set in advance to the origin of the robot 63 are set. The point 75 is matched with the two-dot chain line, and the lower roll 15 at the standby position indicated by the two-dot chain line is raised by the cylinder 54.
[0032]
FIG. 6 is a second operation diagram of another embodiment.
When compressed air is supplied from the supply port 58 of the cylinder 54, the rod 55 moves forward as indicated by an arrow (4), so that the lower roll 15 indicated by a two-dot chain line is raised as indicated by an arrow (5) and the resin molded product 25 is flattened. While continuing to press the lower surface 42 of the portion 31, the flat portion 31 is continuously sandwiched between the cutter blade 16B. That is, the compressed air is continuously supplied from the supply port 58 of the cylinder 54 (the electromagnetic valve not shown in the figure is in the “open” state), and conversely, the compressed air is not supplied to the supply port 57 (the electromagnetic not shown in the figure). The valve is “open”).
[0033]
When the lower roll 15 has passed a few seconds across the flat portion 31, that is, here, when a few seconds have passed since the solenoid valve was operated, the robot 63 is moved in the direction of the front and back of the figure (the direction of arrow (6) in FIG. 5). Actuate to move the cutter blade 16B and cut the gate 32. At that time, the coordinate control in the Y-axis direction of the robot 63 is used as a reference, and the flat portion 31 is forcibly followed by using the space between the cutter blade 16B and the lower roll 15 as a reference. As a result, even if the holding position of the resin molded product 25 is slightly shifted in the Y-axis direction, the gate 32 can be cut while the cutter blade 16B is aligned with the gate 32 of the resin molded product 25.
[0034]
Thus, since the gate 32 is cut on the take-out machine 62, a dedicated device for positioning and holding the resin molded product 25 is not required, and the equipment cost of the gate cut device 50 can be reduced.
[0035]
Further, since the flat portion 31 is sandwiched between the lower roll 15 and the cutter blade 16B and the flat portion 31 is guided based on the control of the robot 63 in the Y-axis direction, even if the flat portion 31 is bent or deformed within a tolerance. The flat portion 31 can be forced to follow the cutter blade 16B. As a result, the gate 32 extending vertically from the flat portion 31 can be prevented from being excessively cut or left uncut.
[0036]
As shown in FIG. 5, the cutter blade 16B is moved as indicated by the arrow (6) while following the flat portion 31 to cut the gate 32, and the end reference coordinates Xe, Ze at which the cutting reference point 75 is the cutting end position of the gate 32. At this point, the cutting operation of the gate 32 is completed.
Finally, the resin molded product 25 from which the gate 32 on the take-out machine 62 has been removed is taken out as it is to a predetermined position by the take-out machine 62 and flows to the downstream process. And while taking out the take-out machine 62 and returning the gate cut apparatus 50 to an origin, 1 cycle of shaping | molding of the resin molded product 25 is completed.
[0037]
Thus, in the gate cut device 50 according to another embodiment, since the flat portion 31 of the resin molded product 25 is guided by the cutter blade 16B and the lower roll 15, the flat portion is based on the cutter blade 16B and the lower roll 15. The gate 32 can be cut without excess or deficiency while forcibly correcting the displacement of the coordinate position 31 and the deformation of the flat portion 31 during cooling. As a result, there is no need to provide a dedicated jig for positioning and fixing the resin molded product 25, and the equipment cost of the gate cut device 50 can be reduced.
Further, it is possible to eliminate excessive cutting and uncut portions of the gate 32, and it is possible to reduce a defect rate due to gate cutting.
[0038]
Here, an example of the defective rate of gate cut will be described together with a comparative example.
The criterion for defective products was an overcut value of 0.3 mm or more (biting into the flat portion 31), and the number was one or more. In other words, a product with a depth of 0.3 mm or more is regarded as defective. In addition, since the uncut portion can be cut in a later process, it was determined as a good product.
[0039]
In the comparative example, the gate 32 was cut with an operator's visual observation and feeling using a normal cutter. The total number of gates cut was 6773, the number of defects was 149, and the defect rate was 2.2%.
In the embodiment, the gate 32 is cut by the robot 63 using the gate cut device 50 of the present invention. The total number of gates cut is 5214, the number of defects is 73, and the defect rate is 1.4%.
Thus, the defect rate of the example is smaller than the defect rate of the comparative example, and according to the present invention, the defect rate can be reduced by (2.2% -1.4%).
[0040]
In addition, it is also possible to remove the upper roll 14 of the gate cut device 10 of FIG. 1 shown in the embodiment of the present invention.
The control configuration of the robot 63 and the take-out machine 62 shown in FIGS. 4 to 6 is an example.
[0041]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to claim 1, gate cutting device, the upper and lower surfaces of the flat portion while rotating saw clamping one end and proceeds no upper and lower roller towards the vicinity of the other end from the vicinity of the gate, these upper and lower roll A roll holder that is rotatably supported, a grip formed on the roll holder, and extended from the roll holder so as to follow the flat portion in order to cut the gate, and starts cutting from one end and ends cutting at the other end. a cutter blade which, since from the time of cutting the gate, the cutter blade while scanning the upper surface of the flat portion by the upper and lower rolls, it is possible to cut the gate. As a result, there is no need for jigs to position and hold resin molded products with high accuracy, and there is no need to manufacture multiple types of holding jigs for resin molded products with different shapes, increasing versatility and reducing equipment costs. Can be suppressed.
Further, when the gate is cut with the cutter blade, the cutter blade cuts the gate while following the upper surface of the flat portion by the upper and lower rolls, so that the gate can be prevented from being excessively cut or left uncut.
[0042]
According to a second aspect of the present invention, the gate cut device rotates along the lower surface of the flat portion, and proceeds from the vicinity of one end of the gate toward the vicinity of the other end, and a roll that rotatably supports the lower roll. A holder, a connecting portion for connecting the roll holder to the robot, and a cutter blade extending from the roll holder so as to follow the flat portion to cut the gate, and starting cutting at one end and finishing cutting at the other end Therefore, when cutting the gate with the cutter blade, the flat portion is sandwiched between the cutter blade located on the upper surface of the flat portion and the lower roll, and the flat portion of the resin molded product on the take-off machine with respect to the cutter blade The gate can be cut while forcibly following. As a result, there is no need to provide a dedicated jig for positioning and fixing the resin molded product, and the equipment cost of the gate cut device can be reduced.
At the same time, it is possible to eliminate overcutting or uncutting of the gate extending vertically from the flat portion, and to reduce the defect rate due to gate cut.
[Brief description of the drawings]
FIG. 1 is a perspective view of a gate cut device according to the present invention. FIG. 2 is an operation diagram of the gate cut device according to the present invention. FIG. 3 is a diagram of another embodiment. FIG. 5 is a side view of an example of an injection molding apparatus provided. FIG. 5 is a first operation diagram of another embodiment. FIG. 6 is a second operation diagram of another embodiment.
DESCRIPTION OF SYMBOLS 10,50 ... Gate cut device, 12 ... Grip part, 13, 53 ... Roll holder, 14 ... Upper roll, 15 ... Lower roll, 16, 16B ... Cutter blade, 25 ... Resin molded product, 31 ... Flat part, 32 ... Gate: 41: upper surface of flat part, 42: lower surface of flat part, 52: connecting part, 63: robot.

Claims (2)

In a gate cut device for a resin molded product in which a gate extends vertically from a flat portion and in the longitudinal direction of the flat portion ,
The gate cut apparatus, while rotating saw clamping the upper and lower surfaces of the flat portion, the other end and proceeds no upper and lower roller toward the vicinity of the vicinity of one end of the gate, rotatable these upper and lower roll a roll holder for supporting the a grip portion formed on the roll holder, extending from the roll holder to cut the gate so as to follow the flat portion and cut at the other end to start cutting from the end And a cutter blade for ending the operation . In a gate cut device for a resin molded product in which a gate extends vertically from a flat portion and in the longitudinal direction of the flat portion ,
The gate cut device includes a lower roll that rotates along the lower surface of the flat portion and proceeds from the vicinity of one end of the gate toward the vicinity of the other end, and a roll holder that rotatably supports the lower roll. A connecting portion for connecting the roll holder to the robot, and a cutter extending from the roll holder so as to follow the flat portion to cut the gate, and starting cutting from the one end and ending cutting at the other end A gate cut device comprising a blade.

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