JPH06143429A - Joining method by ultrasonic welding - Google Patents

Abstract

PURPOSE:To carry out the welding by one kind of tool horn irrespective of a pat shape of a joining end part of the molded products to be molded. CONSTITUTION:In a joining method wherein joining end parts of both molded products 1, 2 which are obtained by allowing one side joining end part 4 to insert or screw on to the other side joining part 3 of the molded products 1, 2 molded respectively of a thermoplastic material into a hollow cylindrical state are welded through an ultrasonic wave, the molded products 1, 2 are positioned on a main body table A of an ultrasonic device right under an ultrasonic oscillator C installed movablly freely vertically on the upper part of the main body table A and held by setting and positioning in a crossing state to its vertical movement direction. Then the ultrasonic oscillation is transmitted to a space between the joining end parts 3, 4 of both molded products 1, 2 through a tool horn D fitted to the lower end of the ultrasonic oscillator C. With that constitution frictional heat is made to generate on one position of a circumferential direction between the joining end parts 3, 4 positioning in a crossing state to the ultrasonic oscillator C, the part is welded and the joining end parts 3, 4 of both molded products 1, 2 can be joined to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method by ultrasonic welding, and more specifically, one joining end portion of a molded product formed of a thermoplastic material into a hollow cylinder is fitted to the other joining end portion thereof. The present invention relates to a joining method of ultrasonically welding the joining end portions of both molded products that are inserted or screwed together.

[0002]

2. Description of the Related Art Conventionally, a hollow cylindrical tubular molded product made of a thermoplastic material is formed into a hollow cylindrical product, and the other joined end part is fitted or screwed into the other joined end part. The ultrasonic welding of the joint ends is performed by placing both molded products with the joint ends fitted or screwed upright on the vertical line in the same direction with respect to the vertical movement direction of the ultrasonic transducer. It was set and held on the upper side, and the entire circumference of the rim of the joint end was ultrasonically welded. However, the conventional joining method is
Attach the tool horn formed in the substantially same shape according to the mouth shape of the joint end of the molded product to the lower end of the ultrasonic transducer,
Ultrasonic vibration is transmitted between the entire circumferences of the joint edges of the two molded products to generate frictional heat between the entire circumferences of the joints so that the welding is performed. Therefore, in the conventional joining method, it is necessary to manufacture and prepare several kinds of tool horns each having a shape corresponding to the mouth shape of the joined end portion of the molded product (round cross-sectional shape of the molded product), which makes equipment management difficult. At the same time, it was necessary to manage the tool horns of different shapes, each of which had to be stored in a troublesome and troublesome manner. Also, since it is necessary to replace the tool horn on the lower end of the ultrasonic oscillator according to the shape of the joining end of the molded product to be welded, it takes time to set it up, which affects production efficiency. Had a number of problems.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional circumstances, and enables the welding by one kind of tool horn irrespective of the mouth shape of the joint end of the molded product to be welded. It is an object of the present invention to provide a joining method of ultrasonic welding that has been leveled.

[0004]

The technical means taken by the present invention to achieve the above object is to provide one joining end portion of a molded article formed of a thermoplastic material in a hollow cylindrical shape and the other joining end portion thereof. In a joining method of ultrasonically welding the joining ends of the parts into which the parts are inserted or screwed, the molded product is installed on the main body table of the ultrasonic device and is vertically movable above the main body table. The ultrasonic transducer is located directly below the ultrasonic transducer and is set and held in a cross shape with respect to the vertical movement direction of the ultrasonic transducer. It is characterized by transmitting ultrasonic vibrations.

[0005]

[Operation] Therefore, according to the above-mentioned technical means of the present invention, the ultrasonic wave is applied between the joint ends of the two molded products which are fitted or screwed through the tool horn mounted on the lower end of the ultrasonic vibrator. When the vibration is transmitted, frictional heat is generated at one place in the circumferential direction between the joining ends located in a cross shape with respect to the ultrasonic transducer, and the portions are welded to join the joining ends of both molded products. It

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG.
A main body table set and held by C is an ultrasonic vibrator which is supported above a main body table A by a cylinder (not shown) and is vertically movable. D is attached to the lower end of the ultrasonic vibrator C. A tool horn for transmitting ultrasonic vibration from the vibrator C between the joint ends 3 and 4 of the molded products 1 and 2 into which the ultrasonic vibration is inserted or screwed. The jig B is provided with the two molded products 1 and 2 which are positioned directly below and welded in a cross shape with respect to the vertical movement direction.
Via the tool horn D, ultrasonic vibration is transmitted between the joint ends 3 and 4 of the two molded products 1 and 2, and the frictional heat generated between the joint ends 3 and 4 is used to perform both molding. The joint ends 3 and 4 of the products 1 and 2 are instantaneously melted to weld the parts 5 (see FIGS. 1 and 2).

In the jig B, the joint ends 3 and 4 are shown in FIG.
The molded products 1 and 2 which are inserted or screwed as illustrated in FIG. 2 are set and held on the main body table A in a cross shape with respect to the vertical movement direction of the cylinder including the expansion and contraction motion of the ultrasonic transducer C. And a part of the outer peripheries of the molded products 1 and 2 respectively molded in a hollow cylindrical shape by a thermoplastic material and in a cylindrical shape in the example shown in the drawings and in a stepped shape can be held in a conforming state. It is formed so as to have a recess 6 and is configured to be fixedly mounted on the main body table A.

Thus, according to the joining method of the present invention, the ultrasonic wave is set and held on the main body table A through the tool horn D mounted on the lower end of the ultrasonic vibrator C vibrated by the electric energy sent from the ultrasonic oscillator E. Tayo molded products 1,
When ultrasonic vibration is transmitted between the joining ends 3 and 4 of the two, frictional heat is generated at one place in the circumferential direction between the joining ends 3 and 4 which are located in a cross shape with respect to the ultrasonic transducer C, and The part 5 is welded and the joining ends 3 and 4 of the two molded products 1 and 2 are joined.

By the way, both of the above-mentioned molded products 1 are a shaft cylinder, and 2
Is a tip tool and a tail plug. The ink is housed in the barrel 1, the writing tip 7 is held in the tip tool 2, and the tail plug 2 is fitted to the barrel 1 to make a felt-tip pen, a highlighter pen, a ballpoint pen, etc. It constitutes a writing instrument.

[0010]

Since the joining method by ultrasonic welding of both molded products respectively molded in the hollow cylindrical shape with the plastic material of the present invention is constructed as described above, the following operational effects are provided. Bonding that is positioned crosswise to the ultrasonic vibrator by transmitting ultrasonic vibration between the joint ends of both molded products that are inserted or screwed through the tool horn that is attached to the lower end of the ultrasonic vibrator. Friction heat can be generated at one location in the circumferential direction between the end portions to melt and weld the portions. Therefore, according to the joining method by ultrasonic welding of the present invention, regardless of the mouth shape of the joint end of the molded product to be welded, that is, the mouth shape of the joint end of the molded product (the round shape of the molded product is cut like the conventional joining method). It is not necessary to make and prepare several kinds of tool horns each having a shape corresponding to the cross-sectional shape), and the joint ends of all molded products having different mouth shapes at the joint ends by one kind of tool horn. Since welding becomes possible, facility management can be reduced and production efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an ultrasonic device for carrying out a joining method by ultrasonic welding of the present invention,

FIG. 2 is a vertical cross-sectional view showing an example of a molded product joined by the joining method by ultrasonic welding of the present invention.

[Explanation of symbols]

A ... Main body table B ... Jig C ... Ultrasonic transducer D ... Tool horn 1, 2 ... Molded product 3, 4 ... Joined end

Claims (1)

[Claims] 1. A joining method in which one joining end portion of a molded product each molded by a thermoplastic material in a hollow cylindrical shape is inserted or screwed into the other joining end portion, and the joining end portions are ultrasonically welded to each other. In the method, the molded product is placed on a main body table of an ultrasonic device, directly below an ultrasonic transducer which is vertically movable above the main body table, and intersects the vertical movement direction. The ultrasonic welding method is characterized in that the ultrasonic vibration is transmitted between the joint ends of both molded products through a tool horn mounted on the lower end of the ultrasonic transducer after being set and held in the shape of a set. .