JP2014024311A - Manufacturing device and method for forming synthetic resin spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and method for forming a synthetic resin spring, while a conventional injection molding die makes products having the same compressive loading strength, so that a new molding die is required for making a synthetic resin spring having different quality characteristics, though a fine synthetic resin spring having a wire diameter of about 0.1 mm cannot be processed.SOLUTION: A feeding device feeds a synthetic resin wire. While the synthetic resin wire is heated along an arc-shaped heating coil pin, cooling gas or liquid is sprayed from a cooling nozzle toward the synthetic resin wire at a curled position for solidification of the shape. At the same time, a pitch tool is moved forward to make a spiral shape for determination of the spiral pitch and moved backward to close the pitch. The spring-shaped synthetic resin is held between a cutting blade and a semicircular column-shaped half round cored bar so as to be cut. The cutting blade is raised for feeding of the synthetic resin wire from a feeding part. The device and method for forming a synthetic resin spring can thus continuously make synthetic resin springs.

Description

The present invention relates to a manufacturing apparatus and a manufacturing method for forming a synthetic resin spring.

Conventional synthetic resin springs are manufactured by injection molding in which synthetic resin is melted at a high temperature and poured into a molding die. In injection molding, only one type of synthetic resin spring can be produced with one mold, which is inefficient.

JP 10-325433 A

The conventional processing method has the following drawbacks.
(B) In injection molds, synthetic resin can be melted at a high temperature and poured into a mold, and only synthetic resin springs that match that mold can be molded.
(B) Synthetic resin springs can only be produced with the same strength of compressive load. To produce synthetic resin springs with slightly different compressive loads, it is not possible to make a new die.
(C) Many molds are required to make synthetic resin springs with different quality characteristics.
(D) Fine plastic resin springs with a wire diameter of about 0.1 mm cannot be processed with injection molds.
The present invention has been made to eliminate the above drawbacks.

A supply portion 15 of the synthetic resin wire 2 wound around the bobbin 1, and a heating coiling pin 7 having a circular arc at the tip for bending and applying heat while sandwiching the synthetic resin wire 2 from the supply portion 15 in a curl shape The synthetic resin wire 2 from the supply unit 15 is spiraled by providing the semi-circular core 6 and the cooling nozzle 11 for solidifying the sprayed shape on the synthetic resin wire 2 in which the gas or liquid for cooling is heated. Forming a synthetic resin spring 13.

A guide roller 3 that stably feeds the synthetic resin wire 2 wound around the bobbin 1 to the upper and lower feed rollers 4, an upper and lower feed roller 4 that feeds the synthetic resin wire 2, and a stable supply of the synthetic resin wire 2 to the heating coiling pin 7 The synthetic resin wire 2 supply section 15 such as the material guide 5 to be melted, the semi-cylindrical half-round cored bar 6 that also functions to hold the curl shape and cut the synthetic resin spring shape 13, and the synthetic resin wire 2 are melted. Heating coiling pin 7 whose tip is arc-shaped while being held at a temperature, heater 8 inserted into heating coiling pin 7 to maintain a high temperature, and synthetic resin wire 2 softened by heating coiling pin 7, synthetic resin spring shape 13 The cooling nozzle 11 and the coiler for solidifying the sprayed shape of the coiled pin 9 and the coiling pin 9 with the arc-shaped tip and the cooling gas or liquid to the heated synthetic resin wire 2 It is composed of a pitch tool 12 having a spiral shape and a synthetic resin spring shape 13, and a cutting blade 10 for cutting the synthetic resin wire 2 with a semi-cylindrical half-round cored bar 6 when the synthetic resin spring shape 13 is completed. Then, the synthetic resin wire 2 from the supply unit 15 is heated by the heating coiling pin 7 held at the temperature at which the synthetic resin wire 2 is melted by the heater 8 along the circumference of the semicircular column of the semicircular cored bar 6. A cooling gas or liquid is sprayed from the cooling nozzle 11 onto the synthetic resin wire 2 bent while applying heat along the arcuate tip of the coiling pin 9 and the arcuate tip of the coiling pin 9, and the pitch is fixed. The tool 12 is fed forward to determine a helical pitch, and the synthetic coil 2 is cut by sandwiching the helical coil between the cutting blade 10 and the semi-cylindrical half-round metal core 6 with a specified length. So, synthetic resin spring shape 13 Manufacturing apparatus for molding a synthetic resin spring shape 13, characterized in that it continued to molding.

The manufacturing method which consists of the following process of shape | molding a synthetic resin spring using a synthetic resin wire.
(Step 1) Sending the synthetic resin wire with the upper and lower feed rollers, while applying heat to the synthetic resin wire along the arcuate shape of the heating coiling pin held at a temperature at which the synthetic resin wire melts and the arcuate tip of the coiling pin Creates a curl-out shape.
(Step 2) Move the pitch tool forward while the synthetic resin wire is sprayed with cooling gas or liquid from the cooling nozzle on the synthetic resin wire at the position of 1/2 curl of the circumference. Make a spiral.
(Step 3) The pitch tool moves forward from the coil-shaped mounting base at a position where the coil shape is 3/4 of the circumference to determine the helical pitch, and then closes the pitch by lowering the synthetic resin. Molded into a spring shape.
(Step 4) When the synthetic resin spring shape is completed with the specified length of the spiral coil, the feeding of the synthetic resin wire is stopped and the cutting blade is moved downward from above, and is sandwiched between the semi-cylindrical half-circle cored bar. The synthetic resin spring is cut to create a synthetic resin spring, the cut blade is raised, the synthetic resin wire is fed from the supply section, and the curl shape is continuously formed to continuously mold the synthetic resin spring.

Synthetic resin springs with different quality characteristics can be molded according to the present invention. By reducing the thickness of the synthetic resin wire, the synthetic resin springs can be efficiently and continuously compressed with a lower compression load than the synthetic resin springs made with conventional injection molds. Can be processed.

It is a (side view) of the manufacturing apparatus which shape | molds a synthetic resin spring using the synthetic resin wire of this invention. It is a (plan view) of the manufacturing apparatus which shape | molds a synthetic resin spring using the synthetic resin wire of this invention.

Hereinafter, the best mode for carrying out the present invention will be described.
1 and 2 show the configuration of a manufacturing apparatus for forming a synthetic resin spring using a synthetic resin wire.
A guide roller 3 that stably feeds the synthetic resin wire 2 wound around the bobbin 1 to the upper and lower feed rollers 4, an upper and lower feed roller 4 that feeds the synthetic resin wire 2, and a stable supply of the synthetic resin wire 2 to the heating coiling pin 7 The synthetic resin wire 2 supply section 15 such as the material guide 5 to be processed, the semi-cylindrical half-round cored bar 6 that functions to hold the curl shape and cut the synthetic resin spring shape 13, and the synthetic resin wire 2 are melted. A heating coiling pin 7 having a circular arc shape at the tip thereof, a heating heater 8 inserted into the heating coiling pin 7 to maintain a high temperature, and a synthetic resin wire 2 softened by the heating coiling pin 7 to form a synthetic resin spring A coiling pin 9 having an arc-shaped tip that forms a curled shape 13; and a cooling nozzle 11 for solidifying the blowing gas or liquid on the synthetic resin wire 2 that has been heated. A pitch tool 12 having a coil shape spirally formed into a synthetic resin spring shape 13 and a synthetic resin spring shape 13 having a predetermined length of a spiral coil are combined with a semi-cylindrical half-circle cored bar 6. It comprises a cutting blade 10 for cutting the resin wire 2.

The synthetic resin wire 2 from the supply unit 15 is a circle of the heating coiling pin 7 held at a temperature at which the synthetic resin wire 2 is melted by the heater 8 along the circumference of the semicircular column of the semicircular cored bar 6. The synthetic resin wire 2 bent while applying heat along the arc-shaped tip and the arc-shaped tip of the coiling pin 9 cools the cooling gas or liquid at the position of the curl of a half turn of the circumference. 11, the curled shape is fed forward from the coil-shaped mounting base 14 side by the pitch tool 12 at the position of 3/4 winding of the circumference while the sprayed shape is fixed to the synthetic resin wire, and in this state the synthetic resin wire Is not cooled down, it is bent helically by the pitch tool 12, the helical pitch is determined, the pitch tool 12 is lowered backward to close the pitch and create a synthetic resin spring shape 13 to define the helical coil In length The feeding of the synthetic resin wire 2 is stopped, the cutting blade 10 is moved downward from above, the synthetic resin wire 2 is cut by being sandwiched between the semi-cylindrical half-circle cored bar 6, the cutting blade 10 is raised, and the supply unit 15 The synthetic resin spring shape 13 can be continuously formed by feeding out the synthetic resin wire 2 and continuously creating a coil shape.

Synthetic resin springs with different quality characteristics can be manufactured as follows.
(B) To change the length of the synthetic resin spring, the number of turns of the synthetic resin spring can be increased by increasing the amount of synthetic resin fed from the feeder.
(B) To change the size of the synthetic resin spring, change the size of the semi-cylindrical half-circle core, and move the tip of the coiling pin according to the size of the semi-cylindrical half-round core. This makes synthetic resin springs with different external dimensions.
(C) Synthetic resin springs with different quality characteristics can be formed by changing the thickness of the synthetic resin wire and the length and size of the synthetic resin spring.

It can be used in the field of medical equipment where image blurring is a problem due to the magnetism of metal springs and in the solvent-based field where rust and dissolution of metals are a problem.

DESCRIPTION OF SYMBOLS 1 Bobbin 2 Synthetic resin wire 3 Guide roller 4 Vertical feed roller 5 Material guide 6 Half-circle metal core 7 Heating coiling pin 8 Heating heater 9 Coiling pin 10 Cutting blade 11 Cooling nozzle 12 Pitch tool 13 Synthetic resin spring shape 14 Mounting stand 15 Supply section

Claims (3)

A synthetic resin wire 2 supply section 15 and a heating coiling pin 7 having a circular arc at the tip and a semi-circular core 6 for bending and applying heat while sandwiching the synthetic resin wire 2 from the supply section 15 in a curled shape. The cooling synthetic resin wire 2 from the supply unit 15 is connected to the helical synthetic resin spring 13 by providing the cooling nozzle 11 for solidifying the spray shape on the synthetic resin wire 2 heated with a cooling gas or liquid. A manufacturing apparatus for molding a synthetic resin spring characterized by molding. The synthetic resin wire 2 supply section 15, a semi-cylindrical half-round cored bar 6 that functions to hold the curl shape and cut the synthetic resin spring, and the tip is held at a temperature at which the synthetic resin wire 2 melts. An arc-shaped heating coiling pin 7, a heater 8 inserted into the heating coiling pin 7 to maintain a high temperature, and a synthetic resin wire 2 softened by the heating coiling pin 7 make a curled shape of a synthetic resin spring in an arc shape Coiling pin 9, cooling nozzle 11 for solidifying the shape of sprayed synthetic resin wire 2, which is heated with a gas or liquid for cooling, and pitch tool to form a synthetic resin spring shape 13 by spiraling the coil shape 12 and a synthetic resin spring composed of a cutting blade 10 that cuts the synthetic resin wire 2 with a semi-cylindrical half-shaped cored bar 6 when a synthetic resin spring shape 13 is formed with a prescribed length of a spiral coil 1 Manufacturing apparatus for molding a synthetic resin spring according to claim 1, characterized in that shaping the. A synthetic resin spring is formed using a synthetic resin wire by the following steps.
(Step 1) Sending out the synthetic resin wire from the supply unit and applying heat to the synthetic resin wire along the arcuate shape of the heating coiling pin held at a temperature at which the synthetic resin wire melts and the arcuate tip of the coiling pin The process of creating curl shapes.
(Step 2) A step of producing a spiral coil by setting a pitch with a pitch tool while blowing a cooling gas or liquid from a cooling nozzle onto a synthetic resin wire when the synthetic resin wire has a curled shape, and solidifying the shape.
(Step 3) A step of cutting the spiral coil into a specified length.

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