JPH0249208B2 - HATSUHOSEIKEIHINNOTORIMINGUHOHOOYOBISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and device for trimming a foam molded product, and provides a method and device that can easily trim a foam molded product whose trimming outline is three-dimensional and complex. Trying to.

Conventionally, after forming various foam molded products from thermoplastic resin foam sheets by means such as press molding, the outer shape of each molded product is trimmed and the excess portion of the foam sheet is cut off to obtain the desired product. This is widely practiced. Among the above methods, trimming processing is conventionally performed by Thomson processing,
Methods such as punching were used.

However, one of the characteristics of the conventional trimming processing described above is that when the shape of the molded product is simple, it can be processed efficiently and is suitable, but the external shape of the molded product, that is, the trimming outline In the case of a three-dimensional curved object, the structure of the conventional cutting blade, cutting die, etc. is mechanically extremely complicated, or it is often impossible to process the object.

For this reason, molded products made of foamed sheets are subject to severe restrictions on their shapes, making it impossible to adopt a free design, which has been an obstacle to expanding demand and popularization of these foamed molded products.

Therefore, in the method of this invention, we have developed a method that eliminates the drawbacks of the above conventional methods and can trim foam molded products whose trimming outline forms a three-dimensional curve easily and with a good finish. This method involves holding the material to be trimmed in the center of at least a pair of guide plates arranged vertically with an interval, with a guide groove formed through the foam molded product along the trimming outline. Then, by moving the upper and lower sliding members slidably inserted along the upper and lower guide grooves, the linear heater stretched between the upper and lower sliding members is trimmed. It is characterized in that it is moved along the outline line and trimming is performed on the material to be trimmed by heat cutting.

Next, embodiments of the method of the present invention will be illustrated below with reference to the drawings together with the trimming device used.

1, 1,', 2, 2' are guide plates, and the four corners of each rectangular guide plate 1... are removably attached to the supports 3, 3... with bolts B, etc., and the guide plates 1, 2 are inserted from above. Guide plates 1', 2, and 2' are arranged in parallel in this order, with a slightly wider gap between guide plates 1' and 2 in the center. It will be placed.

Among the guide plates 1..., the pair of guide plates 1 and 2 are provided with guide grooves 10 having the same shape and corresponding to the trimming outline a on one side of the foam molded product A.
20 is formed through the guide plates 1 and 2 in the substantially longitudinal direction. In addition, the remaining pair of two guide plates 1',
2', a guide groove 10' having the same shape as that corresponding to the trimming outline a' on the other side of the foam molded product A;
20' is formed through the guide plates 1', 2' in the substantially longitudinal direction. Note that 11' and 21' are relief grooves,
The guide plates 1' and 2' in the central portion on the line of movement of the linear heater, which will be described later, are formed through the guide plates 1' and 2' so as not to impede the movement of the linear heater.

Reference numerals 12 and 12' designate rails, which are laid at both ends of the long sides of the upper guide plates 1 and 1', and are useful for mounting and smooth movement of slide members, which will be described later.

Next, 4, 4', 5, 5' are sliding members,
It is formed into a narrow plate shape that crosses the short sides of the guide plates 1. A pair of slide members 4 and 5 are provided adjacent to the upper and lower sides of one set of guide plates 1 and 2. A pair of slide members 4', 5' are provided above and below the guide plates 1', 2', and all the slide members 4 are fixedly attached at both ends to the vertical frames 6, 6, and the rails 12, Each slide member 4 can integrally move in the longitudinal direction of the guide plate 1 while sliding on the guide plate 12'. Further, in the longitudinal direction of each slide member 4, that is, in a direction substantially perpendicular to the guide groove 10, two parallel slide grooves 40, 41, 40'41', 50, 51, 50',
51' is formed.

Next, 7, 7, 7', 7' are sliding members formed in a stepped cylindrical shape, and the respective guide grooves 10... and slide grooves 40, 41... which are adjacent to each other.
It can be inserted into both grooves 10..., 4 at the same time.
It is designed to be able to slide along the lines 0, 41... while being regulated.

A pair of sliding members 7, 7, a set of guide plates 1,
2 and slide members 4, 5, upper and lower guide grooves 10, 20 and slide grooves 40, 5
Upper and lower sliding members 7, 7 are respectively slidably inserted into and attached to the inside of the housing. A linear heater 8 for heat cutting is vertically stretched between the upper and lower sliding members 7, 7, and 80, 80 is a wiring cord connected to a power source for heating the heater 8. The remaining two pairs of sliding members 7', 7' are combined with guide plates 1', 2' and slide members 4', 5', and are combined with upper and lower guide grooves 10', 20' and slide groove 41'. , 51', upper and lower sliding members 7', 7' are respectively slidably attached, 8' is a linear heater, and 80', 80' are wiring cords, which can be slid in the same manner as above. member 7',
It is attached to 7'.

At this time, in the slide members 4', 5 in the center part, the slide grooves 40', 5 on the opposite side to the slide grooves 41', 50 into which the slide members 7, 7' are inserted.
1 are located on the line of movement of the linear heaters 8, 8' of the other set, and are therefore used as relief grooves when the heaters 8, 8' are moved. However, the slide grooves 41, 50' formed in the upper and lower slide members 4, 5' are not necessarily necessary and may be omitted.

Next, 9 is a fixing mechanism for the material to be trimmed A'.
A pressing tool 91 provided above the guide plate 2 by means of a cylinder 90 so as to be movable up and down allows the material to be trimmed A' to be pressed and fixed during trimming (see FIG. 2).

In addition to the above structure, the fixing mechanism 9 has a structure in which a press arm 92 for the material to be trimmed A' is rotatably supported by a shaft 93, and the tip of the arm 92 presses and fixes the material to be trimmed A' (Fig. 7). ), or a vacuum suction tool 94 is provided in the center of the guide plate 2 to suction and fix the bottom surface of the material to be trimmed A' (see Fig. 8). Various known structures can be employed as long as they can prevent the movement of.

Next, a trimming method using the above device will be described.

In the case of the figure, foam molded product A to be trimmed
A boat-shaped vessel is used as a vessel, and the external shape of the vessel, such as the curved rising part of the bow and the stepped part of the stern, is not a simple planar curve, but a complex external shape with three-dimensional unevenness ( (See Figure 10).

Therefore, the trimming contour lines a and a' also become three-dimensional curves (see FIG. 9), which are difficult to cut using conventional trimming devices.

The material to be trimmed A' is supplied with surplus portions left on two sides of the molded product A after it has been bulged into a desired molded product shape by press molding or other means from a foamed sheet such as a foamed polystyrene sheet. is set at a predetermined position on the upper surface of the guide plate 2 at the lower center of the device.

Note that the guide plates 1, 1', 2, and 2' are equipped in advance with guide grooves 10, 10', 20, and 20' corresponding to the trimming outlines a and a' on the two sides of the foam molded product A, respectively. It is assumed that

Next, the two sets of sliding members 7, 7 and 7', 7' slidably inserted into each guide groove 10... and slide groove 40..., slide member 4... in the longitudinal direction of guide plate 1... By moving each guide groove 1
0, 20...

Then, the linear heaters 8, 8' stretched between the two sets of sliding members 7, 7 and 7', 7' align with the trimming contour lines a, a' on the two sides of the material to be trimmed A'. Moving along the trimmed material made of foam
A trimming process can be performed by heat cutting A'.

In the case of the illustrated embodiment, there is a point where the trimming contour lines a and a' on the two sides intersect;
Guide plates 1, 2 and 1' corresponding to a', respectively;
2' are arranged vertically in parallel, and two sets of linear heaters 8, 8' for trimming the two sides a and a' are installed in separate slide grooves 40, 50 and 41 arranged in parallel in slide members 40, 41... Because of the structure in which the heaters 8 and 8' are inserted into the holes 8 and 51' and moved by sliding, the trimming outlines a and a' on each of the two sides can be accurately trimmed at the same time without collision or interference or disturbance of the cutting lines. It is now possible to disconnect it.

Although the slide member 4 can be moved manually, it is possible to move the slide member 4 by using a cylinder mechanism, a crank mechanism,
If a rack and pinion mechanism or other mechanism capable of moving the entire slide member 4 in a straight line is attached and automated, efficient processing will be possible and suitable for mass production.

Next, the modification example shown in FIGS. 11 and 12 is as follows.
This is a case where the trimming contour lines a and a' on the two sides do not intersect with each other, unlike the previous embodiment.

Therefore, there are only one pair of guide plates 1 and 2, and the two sides of the pair of guide plates 1 and 2 have trimming outlines a,
Guide grooves 10, 10' and 20, 2 corresponding to a'
0' are arranged in parallel. Only one slide groove 40, 50 is formed in the slide members 4, 5 adjacent to the guide plates 1, 2, and two slide grooves 40, 50 are formed for trimming the two sides a, a' of the molded product A. Two sets of sliding members 7, 7 and 7', 7', to which linear heaters 8, 8' are stretched, are inserted and attached to the common slide grooves 40, 50. The structures of the other pillars 3, rails 12, 12, etc. are the same as in the previous embodiment, and the fixing mechanism 9 is also the same.

If the trimming outlines a and a' on the two sides do not intersect, as in the above modification, the entire apparatus becomes very simple and the trimming process can be carried out more efficiently.

As described above, according to the trimming method of the present invention, unlike conventional punching and Thomson processing, complicated punching dies and cutting blades are not provided, and cutting and trimming is performed using linear heaters stretched vertically. Therefore, even if the outer shape of the molded product is complex and the trimming outline is curved with three-dimensional unevenness, it can be cut freely without being affected by the above-mentioned unevenness. Therefore, the shape of the molded product can be freely designed and manufactured, contributing to improving the design and expanding the applications of foam molded products.

The linear heater is stretched between sliding members that slide in guide grooves formed on the upper and lower guide plates, and the linear heater is moved according to the guide groove along the trimming outline. Therefore, it can be cut into extremely accurate curved shapes, resulting in a beautiful finish with stable quality. Furthermore, by simply changing the shape pattern of the guide groove, it can easily accommodate changes in the shape of the molded product, and has excellent flexibility.

As a trimming device, the structure of the linear heater, sliding member, guide groove, etc. is simple and easy to manufacture, and it is much cheaper than conventional complicated punching dies and cutting blades, and it generates a large shear force when cutting. Since heat can be cut easily without applying heat, the entire device has excellent durability against wear of each mechanism, requires less maintenance and management costs, and reduces operating costs.

As mentioned above, the method and device for trimming foam molded products can easily realize three-dimensional trimming, which was extremely difficult in the past, and has many excellent features such as being able to greatly contribute to expanding demand for these foam molded products. It has the following.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the present invention, in which Fig. 1 is a perspective view of the trimming device, Fig. 2 is a longitudinal cross-sectional view, and Figs. 3 to 6 are plan views showing each guide plate in sequence. Figures 7 and 8 are partial sectional views showing modified examples of the fixing mechanism, Figure 9 is a perspective view of the trimming material, Figure 10 is a perspective view of the foam molded product after processing, and Figure 11 is a modified example. A partially cutaway perspective view of
FIG. 12 is a cross-sectional view. 1, 1', 2, 2'... Information board, 10, 10',
20, 20'... Guide groove, 11, 21... Relief groove,
3... Support column, 4, 4', 5, 5'... Slide member, 40, 40', 41, 41', 50, 50',
51, 51'...Sliding groove, 7,7'...Sliding member, 8,8'...Linear heater, 9...Fixing mechanism,
A'... Material to be trimmed, a, a'... Trimming outline, A... Foamed molded product after processing.

Claims (1)

[Scope of Claims] 1. A material to be trimmed is held in the center of at least a pair of guide plates arranged vertically with an interval, each having a guide groove formed through the foam molded product along the trimming outline. Then, by moving the upper and lower sliding members slidably inserted along the upper and lower guide grooves, the linear heater stretched between the upper and lower sliding members is trimmed. A method for trimming a foamed molded product, which is characterized by moving the material along the outer contour line and subjecting the material to be trimmed to a trimming process using a heat cut. 2. The movement of the upper and lower sliding members is achieved by using a pair of upper and lower sliding members having slide grooves formed through the guide grooves in a direction substantially perpendicular to the guide grooves, together with the sliding members slidably inserted into the guide grooves and the slide grooves. A method for trimming a foam molded product according to claim 1, by moving the foam molded product in a direction substantially parallel to the groove. 3 Using two sets of sliding members and a linear heater,
3. The method for trimming a foam molded product according to claim 2, wherein the trimming outlines on two sides of the foam molded product are simultaneously heat-cut by moving separate linear heaters and sliding members. 4 Two sets of sliding members and a linear heater are connected to two pairs of guides arranged vertically in parallel, each having a guide groove formed through only one side of the trimming outline on two sides of the foam molded product. A method for trimming a foam molded product according to claim 3, wherein the plates are moved along separate guide grooves. 5 A set of at least two guide plates arranged vertically with an interval in between is provided with a guide groove formed through the trimming outline of the foam molded product, and a guide groove is provided in the slide member adjacent to each guide plate. In addition to providing a slide groove formed to cross the guide groove and penetrating the guide groove in a direction substantially perpendicular to the guide groove, the upper and lower slide members can be moved together in a direction substantially parallel to the guide groove, and the guide groove and the slide adjacent to each other are A trimming device for a foamed molded product, characterized in that a linear heater for heat cutting is stretched between a pair of upper and lower sliding members which are slidably inserted into both slide grooves of the members. 6 Trimming of two sides of a foamed molded product Trimming of a foamed molded product as set forth in claim 5, comprising two separate sets of linear heaters and sliding members for heat-cutting only one side of the outline. Device. 7 Two sets of guide plates each having a guide groove formed through only one of the trimmed outlines on the two sides of the foam molded product are arranged vertically in parallel, and two sets of guide plates adjacent to both sets of guide plates are arranged vertically in parallel. Two sets of linear heaters that make the pair of slide members movable together, and that form the slide grooves by shifting them back and forth between the two sets of slide members, and further heat-cut the trimming outlines on both sides separately. 7. A trimming device for a foam molded product according to claim 6, wherein relief grooves are formed through each guide plate and slide member on the line of movement of the foam molded product.