TWI712481B - Resin sheet cutting machine - Google Patents

Abstract

The subject of the present invention is to provide a resin sheet cutting machine that does not generate chips, has a short cutting time, and can easily perform adjustment operations. The resin sheet cutting machine of the present invention is provided with: a platform 3 on which a resin sheet to be cut is placed; and a band-shaped cutter 8 whose tip faces the upper surface of the platform 3 and is above the platform The posture in which the surface 3 extends in parallel is maintained above the platform 3; the tool holder 7, which holds the tool 8; and the crank mechanism (the tool lifting mechanism) 6, which lifts and lowers the tool holder 7 and the tool 8 integrally; and The cutter 8 is lowered by the crank mechanism 6 until its tip is in contact with the upper surface of the platform 3, and the resin sheet placed on the platform 3 is cut. The resin sheet cutting machine is constructed as described above and does not generate chips , The resin sheet can be cut in a short time, and the position of the cutter can also be adjusted easily.

Description

Resin sheet cutting machine

The present invention relates to a resin sheet cutting machine for cutting a wide and hard resin sheet.

Hard resin sheets such as polycarbonate are generally manufactured by extrusion molding, and are continuously extruded from an extruder that performs the extrusion molding, and then cut to a specific length to become a product. The resin sheet cutting machine (hereinafter referred to as the "cutting machine") that performs this cutting is mostly to make the circular saw move in the extrusion direction (the sheet moving direction) while following the extrusion speed of the extruder. Those who move in the cutting direction (sheet width direction) (for example, refer to Patent Document 1). However, if a circular saw is used to cut the resin sheet, it will produce shavings (swarf) during the cutting. Therefore, a step to remove the shredded powder attached to the resin sheet due to static electricity is required. The cutting powder between the extruder and the cutting machine sandwiched between the protective film covering the upper and lower surfaces of the resin sheet and the resin sheet may cause poor quality in the subsequent steps. In addition, since it takes a long time for one cut, it is sometimes difficult to apply to the manufacture of wide or short resin sheets. If the extrusion speed is high, the circular saw must be used accordingly. The movable range of the moving direction increases, and there is also the problem of the overall size of the cutting machine. In contrast, if shear cutting is used as the cutting method, no cutting powder will be generated, and the cutting time will be short, so the above-mentioned problem of cutting with a circular saw can be solved. However, with shear cutting, the thicker the resin sheet is, the more likely it is to break when it is cut. Therefore, it is necessary to accurately manage the distance between the upper knife and the lower knife. The upper knife and the lower knife must be accurately controlled before or during the cutting operation. The interval adjustment is very troublesome. On the other hand, in Patent Document 2, similar to the above-mentioned shearing and cutting, as a cutting method that does not generate chipping and has a short cutting time, it is proposed that the resin sheet is simultaneously driven from the top and bottom to the movable Knives and fixed knives are methods of cutting resin sheets by brittle failure. In this cutting method, the important point is to minimize the time difference between driving the movable knife and the fixed knife in the width direction of the sheet, and the deviation of the sheet moving direction between the movable knife and the fixed knife. Therefore, as with the shearing and cutting, the adjustment of the distance between the movable knife and the fixed knife is troublesome, and it is also necessary to adjust the driving timing of the two blades. Furthermore, since the cut surface of the resin sheet after cutting is almost brittle, the appearance of the product is not good. Also, as cutting methods other than the above, the use of lasers or water jets is also considered, but this cutting method is not only costly, but also has the difficulty of longer cutting time as in the case of using a circular saw. And it will produce chips of a different shape from the cutting powder of a circular saw, and the chips must be processed. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent Laid-Open No. 2002-66990 [Patent Document 2] Japanese Patent Laid-Open No. 2005-59156

[Problems to be Solved by the Invention] Therefore, the subject of the present invention is to provide a resin sheet cutting machine that does not generate chips, has a short cutting time, and can easily perform adjustment operations. [Technical Means to Solve the Problem] && In order to solve the above-mentioned problems, the resin sheet cutting mechanism of the present invention is equipped with: a platform on which a resin sheet to be cut is placed; a strip-shaped knife with a knife The tip faces the upper surface of the platform and extends in parallel with the upper surface of the platform. The posture is maintained above the platform; and a tool lifting mechanism that raises and lowers the tool; and the tool is lowered to it by the tool lifting mechanism The tip of the knife makes contact with the upper surface of the platform, thereby cutting the resin sheet placed on the platform. That is, the structure is such that the belt-shaped tool held above the platform is lowered until its tip is in contact with the upper surface of the platform, and the resin sheet on the platform is cut so that no chips and energy are generated. Cut off in a short time, and the tool position can also be adjusted easily. Here, when the thickness of the resin sheet is 6 mm or less and the cut length (sheet width) is 2000 mm or less, the cutter is preferably the following: including the cutter body and the tip portion of a constant thickness , The tool tip is formed in a triangular shape in the thickness direction section by two inclined surfaces inclined with respect to the front and back of the tool body; and the thickness of the tool body is 0.2～3.0 mm (preferably 0.2～0.5 mm ), the angle formed by the two inclined surfaces forming the blade tip portion is 15-30 degrees (preferably 15-25 degrees). In addition, if the cutter is held in a cutter holder that is detachably attached to the body of the resin sheet cutting machine and can be exchanged integrally with the cutter holder, the tool exchange becomes easy and can be exchanged in a short time. Perform exchange operations. [Effects of the invention] The resin sheet cutting machine of the present invention is configured as described above to lower the belt-shaped tool held above the platform until its tip contacts the upper surface of the platform, thereby preventing The resin sheet on the platform can be cut by generating chips, so there is no need for chip processing steps, and there is no risk of chips causing poor quality in subsequent steps. In addition, it can be cut in a short time compared with a circular saw, so it has a wide range of applications for manufacturing wide or short resin sheets, and it can also shorten the cutter when the extrusion speed is high. The movable range of the sheet moving direction, and the whole cutting machine is miniaturized. In addition, compared with the cutting or cutting using the movable knife and the fixed knife mentioned above, only one tool is used, so the adjustment of the tool position is easier, and the cutting operation can be performed in a short time before or during the operation. Adjust the job. Furthermore, the cutting noise can be reduced more than the cutting or shearing of a circular saw, and the cutting surface is smooth and the appearance of the product is better.

Hereinafter, an embodiment of the present invention will be described based on the drawings. The resin sheet cutting machine is shown in Figure 1 and Figure 2. The main part of the cutting machine body is composed of the following: a rectangular plate-shaped base 1, standing on the upper surface of both sides of the base 1. A pair of rectangular racks 2, a platform 3 erected between the upper surfaces of the upper sides of the two rectangular racks 2, a flat lifting member 4 disposed above the platform 3, and fixed on both sides of the lifting member 4 The column member 5, and the crank mechanism 6 for integrally lifting the lifting member 4 and the two column members 5; and the tool holder 7 is installed on the lower edge of the lifting member 4, by the belt held in the tool holder 7 The plate-shaped cutter 8 cuts the resin sheet continuously extruded from the extruder (not shown) and supplied onto the platform 3 to a predetermined length. In this cutting machine, a hard resin sheet such as polycarbonate resin with a thickness of 6 mm or less and a cut length (sheet width) of 2000 mm or less is used as the cutting object. Although the illustration of the above-mentioned base 1 is omitted, it is maintained to be capable of reciprocating movement in the direction of sheet travel, and is connected to a servo motor via a motion conversion mechanism that converts rotational motion into linear motion. In addition, the cutting machine is driven by a servo motor to follow the extrusion speed of the extruder to move to the downstream side of the sheet movement when cutting, and returns to the original position after the cutting is completed. On the upper surface of the platform 3, at a position opposite to the tip of the cutter 8, a bar-shaped cutter receiving portion 3a with a rectangular cross section is embedded. In addition, since the tool receiving portion 3a is in contact with the tip of the tool 8 during the cutting operation described later, it can be exchanged according to the damage condition. In addition, L-shaped side plates 9 are erected on both sides of the upper surface of the platform 3 when viewed from the side, and guide plates 10 for guiding the column members 5 in the vertical direction are fixed to the side plates 9. In addition, each column member 5 penetrates the platform 3 in the vicinity of the erected position of the side plate 9, and is connected to the crankshaft mechanism 6 by a leg portion 5 a provided on the lower end side thereof. The crankshaft mechanism 6 includes: a servo motor 11, which is arranged on the base 1; a crankshaft 13, which is connected to the servo motor 11 by a belt 12; and a connecting member 14, which connects the crankshaft 13 and each column member 5 Each of the feet 5a is rotatably connected. Both ends of the crankshaft 13 are rotatably supported by supporting members 15 provided on the lower surface side of the platform 3. When the servo motor 11 is driven, the column members 5 connected to the crankshaft 13 are guided by the guide plate 10 to move up and down along with the rotation of the crankshaft 13, and the lifting members 4 to which the column members 5 are fixed, and the cutters mounted on the lifting members 4 The holder 7 and the cutter 8 are also raised and lowered integrally. That is, the crank mechanism 6 becomes a tool lifting mechanism that lifts and lowers the tool. And, as shown in FIG. 3, the tool 8 slightly contacts the tool receiving portion 3a of the platform 3 at the lowest point. The above-mentioned lifting member 4 is shown in FIGS. 1 and 4, a plurality of windows 4 a are opened in the lower part, and the holder mounting bolt 16 is screwed into the tool holder 7 from the lower edge of each window 4 a. Each holder mounting bolt 16 is such that the tool holder 7 of the lifting member 4 can be easily attached and detached, and the head is set to a size that is easy to grasp by hand. In addition, at the lower edge of the downstream side surface of the lifting member 4, there are provided a plurality of stoppers 17 for positioning the sheet moving direction when the cutter holder 7 is installed. The above-mentioned tool holder 7 is shown in Figures 4 and 5 and is a long member with a U-shaped cross-section. Most of the tool body 8a of the tool 8 is inserted into the U-shaped platen together with the plate-shaped pressing plate 18 The inside of the profile. In addition, the pressing plate 18 is pressed from the outer side of the side wall on one side (downstream side) with the head bolt 19 screwed in, thereby clamping the cutter body 8a between the pressing plate 18 and the side wall on the other side (upstream side). Thereby, the tool 8 is held in the tool holder 7 with its tip facing the upper surface of the platform 3 (tool receiving portion 3a) and extending parallel to the upper surface of the platform 3. In addition, in order to facilitate the tool exchange operation described later, protrusions 7a are provided on both ends of the tool holder 7 in the longitudinal direction, and the lower ends of the two ends of the lifting member 4 are provided with tool holders that are detached from the lifting member 4 7 of the protrusion 7a of the holder receiving portion 4b (refer to Figure 1). Furthermore, as shown in Figs. 1 and 4, the tool holder 7 is provided with a metal piece 20 having a U-shaped cross section at two positions in the longitudinal direction of the outer side of the side wall of one side. Each metal piece 20 is fixed by bolts with the opening of the U-shaped cross section facing downward, and a U-shaped notch 20a is formed from the lower edge of the side wall on the upstream side. The above-mentioned tool 8 is shown in FIG. 6 and includes: a tool body 8a with a constant thickness; and a tool tip portion 8b, the cross section of which in the thickness direction is formed as a triangle by two inclined surfaces inclined with respect to the front and back of the tool body 8a Shape, and the thickness T of the tool body 8a is 0.2～3.0 mm (preferably 0.2～0.5 mm), and the angle θ formed by the two inclined surfaces forming the tip portion 8b is 15～30 degrees (preferably 15～ 25 degrees), can be formed of carbon tool steel, high-speed steel, cemented carbide, stainless steel, ceramics, etc. Next, the cutting operation of the cutting machine will be described. Between the cutting machine and the above-mentioned extruder, the following components (not shown) are provided: a roller conveyor, which supports the lower surface of the resin sheet from the extruder to the adjacent cutting machine; a film coating device, which Cover the upper and lower surfaces of the resin sheet with a protective film in the middle; a labeling machine, which attaches the label to the upper surface of the resin sheet near the downstream end of the roller conveyor; and a take-up roller, which comes from the downstream of the roller conveyor The end lead takes the resin sheet and sends it to the cutting machine. That is, the resin sheet continuously extruded from the extruder moves to the downstream side with its lower surface supported by the roller conveyor, and the protective film is covered on the upper and lower surfaces by the film coating device, and the labeling machine is applied to the upper and lower surfaces. After the label is attached to the surface, it is fed into the cutting machine by a take-up roller. In the cutting machine, once the cutting position of the resin sheet reaches a specific position, the base 1 will follow the extrusion speed of the extruder and start to move to the downstream side. Before and after it, the crankshaft mechanism (tool lifting mechanism ) 6. The column member 5, the lifting member 4, the tool holder 7 and the tool 8 begin to descend integrally. And, as shown in FIG. 3, the tip of the cutter 8 is in contact with the cutting position of the resin sheet (two-point chain line in FIG. 3), and then descends to contact the upper surface of the platform 3, thereby cutting the resin sheet . The cut resin sheet is sent to the next step by a discharge conveyor belt (not shown) installed on the downstream side of the cutting machine. In addition, the base 1 of the cutting machine after the cutting operation moves to the upstream side and then returns to the original position, and the column member 5, the lifting member 4, the cutter holder 7 and the cutter 8 are raised integrally and returned to the original position. Next, the tool exchange operation of the cutting machine will be described. When the tool is exchanged, first, with the crankshaft mechanism 6 stopped, loosen the holder mounting bolts 16 screwed into the windows 4a of the lifting member 4, thereby causing the tool holder 7 to drop and become the lifting member 4 The holder receiving portion 4b supports the state of the protrusions 7a at both ends. In this state, as shown in Figure 4, insert the flat plate portion 21a at the front end of the rod-shaped jig 21 into the U-shaped cross section from below the metal piece 20 mounted on the tool holder 7 to make the jig 21 front end The outer periphery of the vicinity abuts against the inner peripheral edge of the notch 20a of the metal fitting 20. In addition, the tool holder 7 is slightly lifted from the holder receiving portion 4b by the jig 21, drawn to the upstream side of the cutting machine, and moved to a position deviated from above the resin sheet. As described above, after the tool holder 7 integrated with the tool 8 is removed from the cutting machine body, another tool holder 7 that has previously held a new tool 8 is installed in the cutting machine in the reverse order of the above. The machine body. In addition, when inserting a new cutter holder 7 under the lifting member 4 from the upstream side of the cutting machine, by abutting against the stopper 17 provided on the lifting member 4, positioning of the sheet moving direction can be easily performed . In addition, the removed tool holder 7 is separately turned upside down (see Figure 5) to loosen the head bolt 19 to exchange the tool 8 itself, and after adjusting the position of the new tool 8 accurately, tighten it again The head bolt 19 can be prepared for the next tool exchange operation. The resin sheet cutting machine has the above-mentioned configuration, and the cutting of the platform 3 can be achieved by lowering the belt-shaped cutter 8 held above the platform 3 until its tip is in contact with the upper surface of the platform 3 The resin sheet without generating chips. Therefore, there is no need to use the circular saw chip processing as before, and there is no risk of poor quality due to the chips. In addition, it can be cut in a short time compared with those using a circular saw. Therefore, it has a wide range of applications for manufacturing wide or short resin sheets. When the extrusion speed is high, the cutter 8 can be shortened. The movable range of the sheet moving direction reduces the overall size of the cutting machine. In addition, since only one cutter 8 is used, it is easier to adjust the position of the cutter compared to cutting using two cutters such as shearing and cutting. In addition, the cutter 8 is held in the cutter holder 7 in advance, and the cutter holder 7 is detachably attached to the cutter body, so the cutter 8 and the cutter holder 7 can be exchanged integrally. This exchange operation does not require proficiency and can be performed in a short time. Therefore, as long as the exchange operation is performed during the extrusion operation, several pieces of uncut defective products will be produced, but the extrusion operation is stopped and the cutter itself is opposed to the cutter body. Compared with the case of loading and unloading, the overall efficiency of the resin sheet manufacturing operation can be greatly improved. In addition, the resin sheet cutting machine of the present invention is not limited to cutting the resin sheet continuously extruded from the extruder as in the embodiment, of course, it can also be applied to batch processing to cut the resin sheet to a certain size. Part of resin sheet. In the cutting machine for batch processing, the moving mechanism of the base station is not required.

1‧‧‧Abutment 2‧‧‧Rectangular rack 3‧‧‧Platform 3a‧‧‧Tool receiving part 4‧‧‧Lifting components 4a‧‧‧Window 4b‧‧‧Receiving part of holder 5‧‧‧Column member 5a‧‧‧Foot 6‧‧‧Crankshaft mechanism (tool lifting mechanism) 7‧‧‧Tool Holder 7a‧‧‧Protrusion 8‧‧‧Tools 8a‧‧‧Tool body 8b‧‧‧The tip of the knife 9‧‧‧Side panel 10‧‧‧Guide Board 11‧‧‧Servo motor 13‧‧‧Crankshaft 14‧‧‧Connecting member 15‧‧‧Supporting components 16‧‧‧Retainer mounting bolt 17‧‧‧stop 18‧‧‧Press plate 19‧‧‧Head bolt 20‧‧‧Metal Parts 20a‧‧‧ gap 21‧‧‧Fixture 21a‧‧‧Plate part IV-IV‧‧‧line θ‧‧‧angle

Fig. 1 is a front view of the resin sheet cutting machine of the embodiment. Figure 2 is a left side view of Figure 1. Fig. 3 is an explanatory diagram of the cutting operation corresponding to Fig. 2. Fig. 4 is an enlarged cross-sectional view taken along line IV-IV of Fig. 1; Figure 5 is a perspective view of the appearance of the tool holder of Figure 1 upside down. Fig. 6 is an explanatory diagram of the shape and size of the cutter of Fig. 1.

2‧‧‧Rectangular rack

3a‧‧‧Tool receiving part

4‧‧‧Lifting components

4a‧‧‧Window

5‧‧‧Column member

5a‧‧‧Foot

6‧‧‧Crankshaft mechanism (tool lifting mechanism)

7‧‧‧Tool Holder

8‧‧‧Tools

9‧‧‧Side panel

10‧‧‧Guide Board

13‧‧‧Crankshaft

14‧‧‧Connecting member

15‧‧‧Supporting components

16‧‧‧Retainer mounting bolt

Claims (2)

A resin sheet cutting machine, comprising: a platform, which carries a resin sheet to be cut; a strip-shaped knife, with the tip of the knife facing the upper surface of the platform and parallel to the upper surface of the platform The extended posture is maintained above the platform; and a tool lifting mechanism that lifts the tool and the lifting member integrally; and the tool is lowered by the tool lifting mechanism until its tip is in contact with the upper surface of the platform, This cuts the resin sheet placed on the platform; the cutter is held by a cutter holder that is detachably attached to the lifting member, and is integrally exchangeable with the cutter holder. Such as the resin sheet cutting machine of claim 1, wherein the resin sheet has a thickness of 6 mm or less and a cut length of 2000 mm or less, and the cutter includes a cutter body with a certain thickness and a cutter tip, and the cutter tip is attached to The cross section in the thickness direction is formed into a triangular shape by two inclined surfaces inclined with respect to the front and back of the tool body; and the thickness of the tool body is 0.2~3.0mm, which forms the angle formed by the two inclined surfaces of the tool tip It is 15~30 degrees.

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