JP2005329455A - Brazing furnace for making chain ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brazing furnace for making a chain ring in which heating temperature of a butted part of the chain ring made of pure titanium or stainless steel is uniformized in atmospheric gas, and the high temperature needed for heating and brazing is realized highly precisely. <P>SOLUTION: The brazing furnace for making the chain ring comprises a conveying device for transferring a long chain to be heated having a joining powder brazing filler metal close to a vicinity of a butted part of the chain ring made of pure titanium or stainless steel continuously or intermittently and partially in the longitudinal direction, a tunnel-shaped preheating furnace which is provided corresponding to a transfer path in the longitudinal direction of the conveying device and provided with a resistance heat-generating body in which a preheating tube with the heated chain passed therethrough and a temperature detector to control the temperature in this tube, a tunnel-shaped heating furnace having a furnace core tube with the heated chain passed therethrough and a temperature detector to control the temperature in the furnace core tube at a second stage of the preheating furnace, and a gas introduction member to introduce atmospheric gas into the furnace core tube continuous from a part in a vicinity of an inlet of the preheating furnace to an outlet of a heating furnace. The long chain to be heated is continuously heated and brazed in an introduction pipe arranged inside the furnace core pipe filled with atmospheric gas, and a sealing device to deposit the brazed chain in atmospheric gas is arranged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Detailed Description of the Invention

Industrial application fields

The present invention relates to a brazing furnace for a chain ring that forms long chains such as necklaces and bracelets made of pure titanium or stainless steel.

Conventional technical field

Recently, various methods are selected for joining the butt portion to a pure titanium or stainless steel chain ring forming a long chain such as a necklace or a bracelet depending on the material and size of the chain ring.
Generally, pure titanium or stainless steel chain rings are joined by plasma welding or laser welding in an inert gas atmosphere.

Problems to be solved by the invention

However, when joining the butt portion using the method described above, since titanium is an active metal, oxidation proceeds gradually from 600 ° C., and when it reaches 900 ° C. or higher, oxidation proceeds rapidly in the air. Therefore, during the joining process, as an anti-oxidation measure for pure titanium or stainless steel chain rings, an inert gas is injected from a thin pipe nozzle to the butt part, and the air around the butt part is temporarily replaced with an inert gas atmosphere in advance. The arc discharge is generated between the plasma electrode and the chain ring butting portion. At this time, pure titanium or stainless steel at the butting portion is melt-bonded by the high temperature generated. At times, the oxygen in the atmosphere cannot be shielded sufficiently, and the joints at high temperatures are rapidly oxidized in the air. As a result, it is necessary to form a sticky metal oxide on the metallic luster surface of the chain ring, and to prevent the metal melt from protruding into the outer periphery of the chain ring. It has the disadvantage that it cannot exhibit high-quality glitter. In view of the above problems, the present invention aims to make the heating temperature of pure titanium or stainless steel chain ring butting portion uniform and to maintain the heat resistance of the chain ring butting portion in a sealed device having sufficient heat resistance. An object of the present invention is to provide a brazing furnace for a chain ring which can perform the brazing process and the deposition of brazed chains, and further achieve the high temperature necessary for heat brazing a pure titanium or stainless steel butt. It is.

Means for solving the problem

In order to solve the above-mentioned problems, the brazing furnace for chain rings of the present invention has a continuous or intermediate long heated chain having a powder brazing filler for joining in the vicinity of a butt of pure titanium or stainless steel chain rings. In order to control the temperature inside the preheater tube through which the heated chain passes, and a transfer device that is partly transferred in the vertical direction, corresponding to the vertical transfer path of the transfer device. A tunnel-shaped preheating furnace provided with a resistance heating heating element provided with a temperature detector, a furnace core tube through which a heated chain passes after the preheating furnace, and a temperature for controlling the temperature in the furnace core tube A tunnel-shaped heating furnace provided with a resistance heating heating element provided with a detector, and an entrance of the preheating furnace in a space surrounded by the resistance heating heating element provided in the tunnel-shaped preheating furnace and the heating furnace. Inside the furnace core tube from the vicinity to the heating furnace outlet A gas introduction member for introducing the ambient gas is provided, and the atmospheric gas passes through the gas introduction member and is introduced into the furnace core tube. The long heated chain is continuously heated in the heat-resistant furnace core tube filled with the atmosphere gas. It has a sealing device that allows the brazed and brazed chains to be deposited in ambient gas.

Action

The present invention is constituted as described above, and its operation is as follows.
The chain to be heated is sandwiched between the feed roller and the press roller, and continuously or intermittently passes through the tunnel-shaped preheating furnace in the longitudinal direction, and moves in parallel toward the tunnel-shaped heating furnace outlet. The heated chain is located on the center line of the annular resistance heating element heated to the bonding powder brazing temperature through the space surrounded by the resistance heating element heated to the preheating temperature, from the vicinity of the preheating furnace inlet to the heating furnace outlet The atmosphere gas controlled to a constant flow rate from the external gas supply source through the flow meter into the furnace core tube that continues up to the temperature of the heated heated chain that moves from the furnace outlet after passing through the heating furnace Deposited in gas. As a result, the pure titanium or stainless steel chain ring retains the mirror surface and metallic luster surface quality of the material sufficiently, greatly saves the consumption of expensive atmospheric gas, and makes the butt heating temperature uniform. In addition, it is possible to prevent the chain ring from being poorly finished due to uneven temperature distribution and the instability of the metal structure of the butt brazing part.

Next, an embodiment of the present invention will be described with reference to FIG. The heated chain 1 wound around the supply reel 13 is pulled out by being sandwiched between a feed roller 2 and a press roller 3 that are continuously rotated, and is transported downward and vertically into the furnace core tube 4. Guided in the direction.
In the furnace core tube 4, if necessary, an atmospheric gas whose gas flow rate is adjusted in advance by a flow meter (not shown) flows from the gas introduction port 15 through the tank 8 and through the introduction pipe 7. The temperature in the furnace core tube 4 is measured by a temperature detector 11 installed in the vicinity of the resistance heating heating element 5 in the preheating furnace part, and the material and shape of the heated chain 1 are controlled by PDI control of the resistance heating heating element 5. The temperature of the subsequent heating furnace is adjusted by a temperature detector 12 installed in the vicinity of the resistance heating element 6 and the resistance heating element 6 is heated by PDI control. The temperature is adjusted to a predetermined temperature according to the material, shape and dimensions of the chain 1. A preheating furnace and a heating furnace are constituted by the furnace core tube 4, the resistance heating heating elements 5, 6 and the temperature detectors 11, 12. The atmospheric gas ascends and passes through the introduction pipe 7 through a pipe port 14 provided below the introduction pipe 7.
When the heated chain 1 passes through the furnace core tube 4, it is preheated to a constant temperature, and then heated and brazed to a sufficient temperature, moves from the furnace outlet to the pipe port 14, and is filled with atmospheric gas at a high temperature. By reaching into the tank 8, the pure titanium or stainless steel chain ring is sufficiently retained in the mirror surface and metallic luster surface quality of the material, and is continuously deposited and accommodated at the bottom of the tank 8. This series of processing operations is performed continuously, in accordance with the detection signals of the pair of position detectors 10 and 10 provided at positions where the transfer path between the supply reel 13 and the feed roller 2 is vertically sandwiched. Thus, the feeding speed of the supply reel 13 is adjusted. That is, when the upper position detector 10 detects the heated chain 1, the feeding speed of the supply reel 13 is increased, while when the lower position detector 10 detects the heated chain 1, the supply reel 13 is increased. Reduce the feeding speed.

The invention's effect

As described above, according to the present invention, in the brazing portion brazing of a pure titanium or stainless steel chain ring, a long heated chain having a bonding powder braze in the vicinity of the butt in a gas atmosphere in which the gas flow rate is adjusted is vertically aligned. By controlling the brazing temperature during transfer in the direction and making the brazing addition heat uniform at the chain ring butting section, the following effects can be obtained compared to the conventional method.
(1) Pure titanium or stainless steel chain rings can suppress the progress of the oxidation reaction at high temperature, and the mirror surface and metallic luster surface quality of the material are sufficiently retained even after brazing.
(2) A brazing area of 90% or more is ensured, and the metal melt does not protrude in a protruding shape on the joining outer periphery of the chain ring, and the portion corresponding to the back side of the front side of the chain ring butting portion There will be no gaps left unbonded.
(3) Since the heat capacity inside the heating furnace body is large and the radiant heat generated during brazing is reflected to the region where the heated chain passes, the atmospheric temperature distribution in the furnace can be made uniform, and the butt brazing part This makes it possible to stabilize the metal structure.
(4) Since the brazing operation is efficiently performed collectively, the consumption of expensive atmospheric gas can be minimized, resulting in a significant saving.
(5) The brazing defect rate is reduced and the yield is improved.
(6) Since the heated chain only moves within the heating furnace, the power consumption of the electric furnace is minimal and economical.

Sectional drawing which shows schematic structure of the brazing furnace for chain making in one Example of this invention Perspective view of various chain rings used in the examples

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chain manufacturing (ring) 2 Feeding roller 3 Presser roller 4 Furnace core tube 5 Resistance heating heating element (preheating furnace) 6 Resistance heating heating element (heating furnace)
7 Introduction pipe 8 Tank 9 Viewing window 10 Position detector 11 Temperature detector (preheating furnace) 12 Temperature detector (heating furnace)
13 Supply reel 14 Pipe port 15 Gas inlet

Claims (4)

A transport device that continuously or intermittently transports a long heated chain having a powder brazing filler in the vicinity of a butt of a chain ring made of pure titanium or stainless steel in a longitudinal direction, and a longitudinal direction of the transport device A tunnel-shaped tube provided with a resistance heating heating element provided corresponding to a direction transfer path and provided with a furnace core tube through which the chain to be heated passes and a temperature detector for controlling the temperature in the furnace core tube. A brazing furnace for chain rings, comprising a heating furnace. In a method for brazing a long heated chain having a powder brazing filler in the vicinity of a butt of a pure titanium or stainless steel chain ring, continuously or intermittently, in the preceding stage of the tunnel-shaped heating furnace, A tunnel-like shape provided corresponding to the vertical transfer path of the transport device, comprising a preheating pipe through which the chain to be heated passes, and a resistance heating element provided with a temperature detector for controlling the temperature in the pipe. A brazing furnace for chain rings, wherein a preheating furnace is provided and brazed and heated after preheating a long heated chain. In a method for continuously or intermittently brazing and manufacturing a long heated chain having a powder brazing joint near a butt of pure titanium or stainless steel chain rings, the tunnel-shaped preheating furnace and the heating furnace are followed. A gas that is provided corresponding to the vertical transfer path of the conveying device and that introduces atmospheric gas into the furnace core tube that continues from the vicinity of the preheating furnace inlet to the heating furnace outlet in a space surrounded by a resistance heating heating element An introduction member is provided, and the atmospheric gas passes from the gas cylinder through the pressure regulator and flow rate regulator, passes through the gas introduction member and is introduced into the furnace core tube, and the long heated chain is continuously brazed in the atmospheric gas. A brazing furnace for chain rings characterized by heating. In a method for continuously or intermittently brazing and manufacturing a long heated chain having a powder brazing filler for joining in the vicinity of a butt of a pure titanium or stainless steel chain ring, a longitudinal direction of the conveying device is followed by the heating furnace. A brazing ring brazing furnace characterized by having a quenching device provided corresponding to a direction transfer path and containing a cooling medium for quenching a heated chain heated by the heating furnace.

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