JPH035131A - Method of manufacturing a thermosetting polyurethane belt - Google Patents

Abstract

PURPOSE:To enable boring work and configuration work to be carried out continuously by drawing out a belt intermediate consisting of thermosetting polyurethane which is formed as a certain breadth belt-shaped continuous body from the space between a punch and dies at only a certain length equal to the length of the worked part every time when a punching work is done by a pressing device. CONSTITUTION:A predetermined belt intermediate is mounted in recessed grooves 16a, 16b which is formed in dies 7, and a predetermined weight is applied on the end part of the belt intermediate 10 to be a delivery side, wherein the belt intermediate 10 is put to be pulled up toward the delivery side shown by an arrow P. After this, through the descending operation of a punch 5, the belt intermediate is subjected to a predetermined punching work therebetween the dies 7. When the punch 5 moves upward and the belt intermediate 10 is left in the recessed groove 16 of the dies 7, the belt intermediate 10 moves in the direction of the arrow P through the loads of the weight, and strikes a striking wall 23 resulting in positioning the belt intermediate 10. The belt intermediate 10 is supplied in pulling it out of the recessed groove 16b to the direction of the arrow P with a constant force; as a result, the belt intermediate 10 can be sent constantly into a working area 17 at a certain length.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a belt made of thermosetting polyurethane.

(Prior Art) Conventionally, thermoplastic polyurethane is widely used as the polyurethane constituting the belt, and is manufactured by injection molding, extrusion molding, or the like.

By the way, for applications such as tooth alignment or timing belts, it may be desirable to form belts from thermosetting polyurethane in view of physical properties such as tensile strength and properties of resin materials.

In response to such a demand, unlike thermoplastic polyurethane, thermosetting polyurethane is difficult to form into a belt-like belt by injection molding, etc., so the inventor of the present application first developed a process such as turning from a block of thermosetting polyurethane. He proposed that a band-shaped belt be obtained by means of
(See No. 97).

(Problem to be Solved by the Invention) By the way, even if the belt-shaped belt obtained in this way is used for practical purposes such as tooth alignment correction or timing belts, it is difficult to use a belt intermediate according to the purpose. It is necessary to punch holes and shape the product at a constant pitch.

This invention was made based on the above circumstances, and its purpose is to continuously perform hole drilling and contour processing at a constant pitch on a belt intermediate product formed in the shape of a long belt. be.

(Means for Solving the Problems) In order to achieve this object, the present invention consists of thermosetting polyurethane formed into a belt-like elongated body with a constant width in a press device having a punch and die for punching. In addition to supplying the belt intermediate product, each time the press machine performs punching, the belt intermediate product is inserted into the punch and die for a certain length corresponding to the length of the part punched in the processing process. By pulling out from between
A part of the belt intermediate product that is connected to this part is located between the punch and the die.

(Function) According to the present invention, thermosetting polyurethane is punched out using a die, and a long belt-shaped thermosetting polyurethane belt can be obtained.

In addition, by pulling out the belt intermediate product from between the punch and die by a certain length corresponding to the length of the part that has been punched, the part of the belt intermediate product to be processed in the next punching process is removed. is fed between the punch and die, so that a flexible belt intermediate product can be reliably fed to a certain length between the punch and die.

(Example) This invention will be explained below with reference to an example shown in the drawings.
In this embodiment, the orthodontic belt shown in FIG. 5 is manufactured, and its manufacturing apparatus and method will be explained with reference to FIGS. 1 to 4.

Reference numeral 1 denotes a press device constituting the manufacturing apparatus, which has a slide 2 configured to be movable up and down and a bed 3 fixed below the slide 2.

A punch 5 is attached to the lower end of the slide 2 via a punch holder 4, and a diamond is attached via a die plate 6 to the bed 3 corresponding to the lowered position of the punch 5.

Reference numeral 8 indicates a knockout plate installed on the punch 5, and as shown in FIG. 2, a knockout plate 8 is installed on the punch 5, and as shown in FIG. is supplied.

Note that this belt intermediate product 4 is a long belt-like body formed from thermosetting polyurethane formed into a lump to a certain width and thickness using a lathe, etc., and has flexibility. It is.

As shown in a perspective view in FIG. 3, the punch 5 has a cutting edge portion 11 for contour machining and a cutting edge portion 12 for hole machining. ．． 12 is formed in a groove 13 formed laterally on the lower surface of the punch 5, and the width of this groove 13 is approximately equal to the width W1 of an intermediate belt product 100, which will be described later, as shown in FIG. It is formed.

As shown in FIG. 4, the diamond has a processing section 17 in the center that engages with the punch 5 to punch out the belt intermediate product 10, and in this processing section 17, the punch 5
A through hole 18 is formed to accommodate the side wall 14 of the through hole 1.
At a position corresponding to the cutting blade part 11.12 of the punch 5 at the center of the punch 5, there is a cutting blade part 21.12 for contour processing on the diamond side. A cutting edge portion 22 for hole machining is formed.

Grooves 16a and 16b extending to both ends of each side are formed on both sides of the processing section 17, and the belt intermediate product 10 is supplied to the processing section 17 through these grooves 16a and 16b. Evacuation takes place.

The width dimension of the groove 16a is the width dimension W1 of the belt intermediate product 10.
The width of the concave groove 16b on the side discharged from the processing section 17 is formed to be narrow and equal to the belt width dimension W2 as a product after processing. An abutting wall portion 23 is formed at the inlet portion of the chamber.

This abutting wall portion 23 maintains a constant supply of the belt intermediate product 10, as will be described later.

By the way, in this embodiment, a combination of the punch 5 and the diamond is used to punch out the belt intermediate product 10 once, thereby forming the shape A shown in FIG.

It is possible to punch out four parts B, C, and D at the same time, and these parts A.

Each cutting edge part for forming each part of B, C, and D] 11
2.21. ．． 22 are formed in the same shape at a constant pitch.

Of these parts A, B, C, and D, parts B and C are both punched into a perfect shape, but part A is used to form a hole in the belt intermediate product 10, and
Cut edge 2 perpendicular to the right half of the outline and the belt length
5, and section D is for punching out only the outer shape of the left half of belt intermediate product 0 which was not formed in section A.

Therefore, in the next punching process, the part machined in part A is punched out again in part D, so that it is formed into the same shape as the parts punched in parts B and C.

Next, a method for manufacturing a thermosetting polyurethane belt for orthodontics using the manufacturing apparatus 1 configured as described above will be described.

First, a predetermined intermediate belt product 10 is installed in the grooves 16a and 16b formed in the diamond, and a predetermined weight (not shown) is applied to the end of the intermediate belt product 10 that will be the discharge side. The belt intermediate product 10 is pulled toward the discharge side as shown by arrow P.

Thereafter, by lowering the punch 5, the belt intermediate product 10 undergoes a predetermined punching process with the diamond.

10 belt intermediate products punched out by this punching process
There is a risk that the product may adhere to the area around the cutting edge 12 of the punch 5 for drilling holes, but after this processing, the knockout plates 1 and 8 are moved and the belt product is removed from the groove 16 of the diamond as the punch 5 rises. Avoid escaping.

The punch 5 is on the upper side, and the belt intermediate item 10 is in the groove 1 of the diamond.
6, the intermediate belt article 10 moves in the direction of the arrow P due to the load of the weight, and the cutting edge 25 formed on the intermediate belt article 10 passes through the abutting wall portion 23 formed on the diamond.
The belt intermediate product 10 is positioned by colliding with the above-mentioned part A, and the half-processed part is located in the D part, and the belt intermediate product 1o located in the other processing part 17 is an unprocessed part. be.

In this way, move the belt intermediate product 10 from the concave groove 161 to the arrow P.
If the intermediate belt product 10 made of flexible thermosetting polyurethane is pulled out and fed with a constant force in the direction, the belt intermediate product 10 made of flexible thermosetting polyurethane can be fed into the processing section 17 at a constant length.

On the other hand, as the bonder 5 moves downward in the same way as described above, the part that was previously partially machined in part A is partially machined in part D, and the remaining part is left in the unprocessed state. The intermediate belt product] 0 that was in the above process is subjected to the same processing as described above.

After that, the operation of punch 5 and the operation of base 1 and intermediate product 10 are performed in the same manner.
By repeating the drawing from the processing section 17, the belt intermediate product 10 formed into a long length is continuously punched, and a thermosetting polyurethane belt for orthodontics having a predetermined shape is manufactured. I can do it.

In addition, in this embodiment, the belt intermediate product 10 was pulled out from the processing section 17 using a weight, but
It goes without saying that a known take-up reel or the like capable of applying a constant tension may also be used.

The orthodontic belt 20 thus formed is cut into an appropriate length, and as shown in FIG.
Teeth alignment is performed by hooking the holes 20a formed in the belt 20 onto the locking fittings 31 installed at T1 and T2, respectively, and tensioning them so that an appropriate tension is applied between them. In addition to manufacturing the orthodontic belt 20 described above, Rekoko Co., Ltd. also manufactures the timing belt 41 as described below.
It can also be used in the production of

That is, in the belt intermediate product 10 made of long thermosetting polyurethane formed into a predetermined shape, holes 45 are continuously punched at a constant pitch using punches 5 and diamonds in the same manner as described above. An annular timing belt 41 is formed by forming a timing belt intermediate product 42 with holes formed therein, cutting out a required length from this timing belt intermediate product 42, and connecting both ends in a known manner.
That is.

A pin 44 installed on the sprocket 43 is fitted into the hole 45 of the timing belt 41 to transmit driving force. 44 and hole 4
5 and 5 are both circular in shape and have a reasonable clearance.

In addition, when forming the timing belt 41,
As for the shape of the hole to be formed in the timing belt intermediate product 42, in addition to the circular shape described above, a square hole 46 as shown in FIG. 9 or any other suitable shape can be adopted.

(Effects of the Invention) Since the present invention is configured as described above, 1- An intermediate belt product made of thermosetting polyurethane is punched using a punch and die at a constant pitch to form a long belt. A thermosetting polyurethane belt can be obtained.

In addition, by pulling out the belt intermediate product from between the punch and die by a certain length corresponding to the length of the part that has been punched, the part of the belt intermediate product to be processed in the next punching process is removed. is fed between the punch and the die, so that a flexible belt intermediate product can be reliably fed between the punch and the die for a certain length.

[Brief explanation of drawings]

1 to 4 show the manufacturing apparatus, and FIG. 1 shows a state in which a punch and a die are fitted together. A sectional view taken along the line T-T in Fig. 4, and Fig. 2 a front view showing an outline of the manufacturing equipment.
Figure 3 is a perspective view of the punch, Figure 4 is a top view of the die, and Figure 5 is a perspective view of the punch.
The figure is a plan view of a thermosetting polyurethane belt for orthodontics manufactured by the manufacturing method of the present invention, and FIG. 6 is an explanation of the usage state of the thermosetting polyurethane belt for orthodontics shown in FIG. , FIG. 7 is a plan view of an intermediate belt product for a timing belt manufactured by the manufacturing power and method of the present invention, FIG. 8 is an explanatory diagram of the usage state of the timing belt shown in FIG. 7, and FIG. 9 is a diagram of the timing belt. FIG. 3 is an explanatory diagram of the hole shape to be formed. 1; Press device, 5; Punch, 7; Die, 10; Belt intermediate product, 11.2
1; External processing cutting blade, 12.22. Cutting blade for hole machining.

Claims (2)

[Claims] (1) A belt intermediate product made of thermosetting polyurethane formed as a belt-like elongated body of a constant width is supplied to a press machine having a punch and die for punching, and each time the belt is punched by the press machine, , by pulling out the belt intermediate product from between the punch and the die by a certain length corresponding to the length of the part that has been punched in the processing step, the part of the belt intermediate product that is continuous with the punch is removed by the punch. and a die. (2) The heat according to claim 1, characterized in that the punch and die for punching are formed with a cutting edge for hole processing and a cutting edge for contour processing, respectively, and the orthodontic material is obtained from the belt intermediate product. Method for manufacturing a curable polyurethane belt.