JPS6252693B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a burr processing apparatus that automatically processes burrs generated during molding of plastic products.

In plastic products that are molded, such as washing machine lids, burrs are generated on the so-called parting line, which is the burr-generating surface corresponding to the mating part of the mold. Burrs are removed using tools such as brushes, water grindstones, or end mills, which is not only troublesome, but also tends to cause variations in the surface where burrs occur, and there is a risk of processing errors such as forgetting to remove burrs. It was hot.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hot air supply device that is movable relative to a plastic product and blows hot air onto burrs on the burr-generating surface of the plastic product. By providing a sliding contact member that comes into sliding contact with the burr-generating surface of the product and smoothes the burrs blown by the hot air, the burr-generated surface of the plastic product can be automatically smoothed. To provide a burr processing device for plastic products which is convenient and has a uniform burr-generating surface without causing variations, and which is free from the risk of processing errors such as forgetting to remove burrs.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a gearbox, 2, 3, and 4 are guide boxes, and guide rods 5, 5 are arranged vertically in parallel to connect the gearbox 1 and the guide boxes 2, 3, and 4 in a rectangular shape. A chain 6 is stretched along the guide rods 5, 5, and the four corners of the chain 6 are introduced into the gear box 1 and the guide boxes 2, 3, and 4, respectively. The chain 6 is supported by guide chain wheels (not shown) in the guide boxes 2, 3, and 4, and is meshed with an output gear of a gear mechanism (not shown) in the gear box 1.
When a drive motor (not shown) capable of forward and reverse rotation, which is disposed near the gear box 1, is energized, it is moved in the direction of arrow 7 or in the direction opposite to arrow 7 via the gear mechanism. 8, 8,...
. . are four movable bases that are inserted through and supported by the four sides of the guide rods 5, 5, and a portion of the chain 6 is connected to these, respectively. Reference numeral 9 denotes a hot air supply device having a built-in electric heater and blower (not shown), which is activated when the electric heater and blower are energized, and a nozzle 1 provided at the tip of the upper end is activated.
It is designed to discharge hot air from zero. A mounting member 1 is attached to the middle part of this hot air supply device 9.
1 is attached, and this attachment member 11 is supported by a support member 12 attached to the movable base 8 so as to be rotatable up and down. Furthermore, the upper end of a support tube 13 is attached to the upper end of the hot air supply device 9, and a support shaft 14 is inserted into the support tube 13, and a wheel is attached to the lower end of the support shaft 14. 15 are supported, and this wheel 15 is rotatably mounted on a guide rail 16 arranged along the guide bar. Therefore, the support shaft 14
By adjusting the degree of insertion into the support tube 13, the vertical rotation angle of the hot air supply device 9, that is, the orientation angle of the nozzle 10 can be adjusted. 1
Support shafts 7 and 18 are inserted through the tip of the hot air supply device 9, and these are positioned opposite to each other with the nozzle 10 sandwiched between them, and each tip has a roller as a sliding member. 19 and 20 are supported, and compression coil springs 21 and 22 are interposed between the tips of these support shafts 17 and 18 and the tip of the hot air supply device 9, respectively. The above description is about one movable base 8, but the remaining three movable bases 8 are also equipped with the same hot air supply device 9, rollers 19, 20, etc. as described above. The same parts are indicated by the same reference numerals. Reference numeral 23 designates a plastic product, such as a polystyrene lid for a washing machine, which is integrally molded into a rectangular shape using a two-part mold (not shown), and has peripheral sides projecting downward on its four sides. An edge portion 23a is formed, and a ridge edge portion 23b on the outer peripheral side of the lower end portion, which is a so-called parting line as a burr generation surface corresponding to the mold matching portion of the mold in the peripheral edge portion 23a, is free. Necessary burrs (not shown) are formed. The lid 23 is automatically placed and set on a setting table (not shown) at the center of a rectangular portion surrounded by the guide rod 5 by a setting mechanism (not shown) after being formed by a mold. It's summery. The polystyrene molding temperature using the mold for the lid 23 is usually 200°C or more.
It is desirable to set the temperature of the hot air formed by the hot air supply device 9 to 220°C to 250°C, which is about the same as the polystyrene molding temperature. optimum temperature
The temperature is set at 240℃.

Next, the operation of this embodiment having the above configuration will be explained. After the lid 23 is molded by the mold, the lid 23 is placed and set on a stand by the setting mechanism, as shown in FIG. In this case, the nozzles 10, 10, . . . of the hot air supply device 9, 9, .
The vertical movement angles of the hot air supply devices 9, 9, . . In addition, when the lid 23 is set on the setting table, each of the four hot air supply devices 9,
9, . . . are set to be located on one end side of each of the four sides of the peripheral edge 23a of the lid 23. When the lid 23 is set on the setting stand, for example, a timer (not shown) is activated.
By this timer, the hot air supply device 9, 9,...
... is operated to cause the nozzles 10, 10, ... to discharge hot air, and the drive motor is operated to rotate forward, for example, to move the chain 6 in the direction of the arrow 7,
Based on this, the hot air supply devices 9, 9, . . . are also moved in the direction of the arrow 7 in accordance with the movable bases 8, 8, . Now, considering one hot air supply device 9, when it is moved in the direction of arrow 7, the roller 19 first moves to one ridge edge 23b on the outer circumferential side, which is the burr generation surface on the circumferential edge 23a of the lid 23. The spring force of the compression coil spring 21 causes pressure-sliding contact from slightly diagonally downward, and then hot air from the nozzle 10 is blown onto one edge 23b to melt the burr formed on the edge 23b. Ru. In this case, the temperature of the hot air from the hot air supply device 9 is set to 240°C, which is slightly higher than the polystyrene molding temperature, but since the lid 23 itself has a large heat capacity, it is not melted and only small burrs with a small wall thickness are removed. It will be melted. Then, from the nozzle 10, one ridge edge 23b
After the hot air is blown onto the roller 20, the roller 20 located on the opposite side of the movement direction from the nozzle 10 comes into pressure sliding contact with one edge 23b of the nozzle 10 due to the spring force of the compression coil spring 22, and is melted by the hot air. The burrs are pressed and flattened, that is, the surface where the burrs occur is smoothed. In this case, the approximately flattened burr portion is not precisely flush with the other portions, but has some level difference, but this poses no practical problem. In this way, as the hot air supply device 9 moves in the direction of the arrow 7, the burr on the one edge 23b is continuously flattened. Thereafter, when the above-described burr processing action for substantially flattening the burrs is completed and the hot air supply device 9 is located at the other end of one side of the peripheral edge 23a, the timer is activated. As a result, the drive motor is stopped, and the operation of the hot air supply device 9 is also stopped. The operation of the hot air supply device 9 as described above is the same for the other three hot air supply devices 9. At the same time, they are processed almost equally.
When the burr treatment of the lid 23 is completed, a reset mechanism (not shown) operates to remove the burred lid 23 from the setting table, and the setting mechanism places a new lid on the set table. When the setting is completed, the timer is activated again, and the hot air supply device 9,
9, ...... is operated again, and the drive motor is operated in reverse this time, so that the chain 6 moves in the direction opposite to the arrow 7.
Along with this, the hot air supply devices 9, 9, . In this case, unlike the above-mentioned case, the roller 19 moving in the direction opposite to the nozzle 10 acts to substantially flatten the burr melted by the hot air. The same operation will be repeated thereafter, and the two lids will be deburred by reciprocating the hot air supply devices 9, 9, . . . in the direction of arrow 7 and the direction opposite to arrow 7. .

As described above, according to the present embodiment, the hot air supply device 9 blows hot air onto one ridged edge 23b on the outer peripheral side, which is the burr-generating surface, of the peripheral edge 23a of the lid 23 to melt the burrs. The hot air supply device 9 is provided movably along the section 23b, and rollers 19 and 20 are attached to the tip of the hot air supply device 9 to substantially flatten the burr melted by the hot air, which makes the work easier than before. There is no need for a person to carry out deburring work using a tool, and the deburring process can be performed automatically, which is extremely convenient, and the surface treated with burrs by the rollers 19 and 20 has a good finish, and the surface where burrs occur is uniform. As a result, variations as in the conventional method do not occur, and furthermore, there is no risk of processing errors such as forgetting to remove burrs. Further, according to the present embodiment, as described above, the roller 19 or 20 is brought into pressure-sliding contact after the hot air is blown onto the ridge 23b of the lid 23, so that the burr is substantially flattened. At the same time, the ridge edge 23b forming the corner can be chamfered, eliminating the need for a new chamfering operation.
Moreover, according to this embodiment, four hot air supply devices 9, 9, . . . which operate synchronously are provided, and the lid 2
Since the burr treatment on the outer peripheral edge of the peripheral edge 23a of No. 3 is automatically performed at the same time,
This has the advantage that the burr treatment time is extremely short.

In the above embodiment, one lid is burred by moving the hot air supply device 9 in the direction of the arrow 7, and another lid is burred by moving the hot air supply device 9 in the opposite direction of the arrow 7. However, for example, a configuration may be adopted in which the hot air supply device 9 is moved in the direction of the arrow 7 to perform burr treatment and then rapidly returned in the direction opposite to the direction of the arrow 7. In this case, one of the rollers 1
9 is unnecessary.

Further, in the above embodiment, the roller 1 is used as the sliding member.
9 and 20, for example, a non-rotating spatula-shaped member may be used instead.

Further, in the above embodiment, the hot air supply device 9 is moved, but instead, the lid 23 may be moved by a conveyor or the like, and in this case, the sliding member and the hot air supply device may be moved separately. It may also be attached to an appropriate stationary location.

In the above embodiment, the hot air supply device 9 and the drive motor are controlled by a timer, but they may be controlled using, for example, a position detector that detects the moving position of the hot air supply device 9.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be applied to burr treatment not only for washing machine lids but also for plastic products in general, etc., as appropriate without departing from the scope of the invention. Of course, modifications can be made.

As described above, the present invention is convenient because it can automatically smoothen the burr-generated surface of plastic products, and the burr-generated surface is uniform and does not cause variations. It is possible to provide a burr processing apparatus for plastic products that exhibits excellent effects such as eliminating the risk of processing errors such as forgetting.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view, and FIGS. 2 and 3 are an enlarged perspective view and an enlarged side view of the main parts. In the drawing, 5 is a guide rod, 6 is a chain, 8 is a moving base, 9 is a hot air supply device, 10 is a nozzle, 15 is a wheel, 16 is a rail, 19 and 20 are rollers (sliding contact members), and 23 is a lid. (Plastic products), 23b
indicates the ridge edge (surface where burrs occur).

Claims (1)

[Scope of Claims] 1. A hot air supply device that is movable relative to a plastic product and blows hot air onto burrs on the burr-generating surface of the plastic product, and the hot air is blown by the hot air supply device. A burr treatment apparatus for plastic products, comprising a sliding member that slides on the burr-generated surface of the plastic product to smooth the burr-generated surface. 2. A burr processing apparatus for plastic products as set forth in claim 1, wherein the sliding contact member is constituted by a roller. 3. The plastic product burr treatment apparatus according to claim 2, wherein two rollers are provided at opposing positions with the hot air supply device in between.