JPS61269937A - Producing device for metallic ring - Google Patents

Abstract

PURPOSE:To form in circular shape by cutting the bar like plastic material and to enable the formation of a metallic ring at high speed by forming in circular ring the bar material inserted into a forming groove by the rotation of a core roll and forming roll. CONSTITUTION:The bar 15 material which is formed in the shape of the necessary metallic ring 6 is prepared in advance and that which is formed in plastic shape by inserting it into a heating furnace and by heating inside a cylinder 11 is fed by a roll and inserted into the forming groove 7 of a forming roll 3 by passing through a material cutter 13 from a material inlet port 12. It is then formed in circular ring shape by surrounding the outer peripheral part of the core roll 2. In this case the cutting size is set so that the bar 15 material cut by the material cutter 13 overlaps slightly the head part 15a becoming in annular shape and the tail part 15b. The overlapping part of this material is formed with pressing in the shape of the metallic ring in the forming groove 7 by the joining rotary force of the forming roll 3 at the left part and core roll 2 and simultaneously the both end parts of the ring is press-fitted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to an apparatus that can continuously manufacture small metal rings, and the present invention mainly relates to an apparatus that can continuously manufacture small metal rings, and which cuts a plastic rod-shaped material into pieces and molds them into circular shapes. The purpose of this method is to easily manufacture metal rings, and its industrial applications are vast.

[Conventional technology]

Conventionally, to obtain a metal ring, a sand mold with a ring-shaped space inside is made, and molten metal is injected from the sprue of this sand mold, and the metal is filled into the space via a runner. Casting methods, in which a molten metal is hardened into a ring-shaped product, are the mainstream method of manufacturing metal rings. Although this manufacturing method is suitable for mass-producing small metal rings, this manufacturing method has the following drawbacks.

(1) Most of the molten metal poured into the sand mold is at the sprue.

It becomes return material for runners, etc., resulting in poor product yield.

(2) A protruding molten metal weir (inlet for molten metal) is formed on the product, so finishing with a grinder is required to remove this part.

(3) Since it is a sand mold, the surface roughness of the product is rough.

This, coupled with low productivity, results in high costs.

(5) Pollution problems due to dust and odor generated from sand molds.
This has become a work environment issue.

Another conventional method for manufacturing metal rings uses centrifugal casting using a mold. This has the advantage of being able to repeatedly manufacture the same metal ring with one mold, and also has a good product yield rate as the molten metal injected into the mold becomes the entire product. At the same time, this method also has the disadvantage that non-uniformity in the amount of injection leads to non-uniformity in the product, so in order to mass-produce uniform metal rings using this method, it is necessary to develop technology for automatic pouring of small amounts of uniform metal. .

[Problem that the invention seeks to solve]

The ability to mass-produce uniform good products in a favorable working environment without requiring post-processing such as casting finish is an essential solution for providing inexpensive metal seals on the market, and is an object of the present invention.

[Means for solving problems]

In the present invention, in order to solve the problems that cannot be solved with the conventional techniques as described above, the material used is not a completely molten metal as in the conventional method, but a plastic rod-shaped material cut into pieces.

As a result, by making the cut dimensions of the rod-shaped material made for this type of metal ring the same, it has become possible to obtain metal rings with completely uniform dimensions and weight. Moreover, the manufacturing method of the present invention is a simple manufacturing method that only involves molding a rod-shaped material into a circular shape and molding and crimping the connecting portion, so that mass production is possible.

The finished product is a good product that does not require post-processing.
Production is possible in a clean factory with a good working environment and no worries about pollution.

〔Example〕

In the embodiment, an apparatus for manufacturing a metal ring having a constricted portion on the upper edge of the outer periphery as shown in FIGS. 1 and 2 was used.

Indicated. The details of the embodiment of the present invention will be explained below with reference to FIGS. 3 to 9. There is a core roll (2) in the center of the roll chamber (1), and two forming rolls (3) are in contact with it. in relative position. The core roll (2) and the forming roll (3) each rotate in the direction of the arrow, but in that case, the outer peripheral speed of the core roll (2) and the forming roll (3)
) are set so that each rotates equally. The core roll (2) is cylindrical and has a structure that allows it to rise and fall while rotating, and the forming roll (3)
It has a disc-shaped body with thin inner cores on the top and bottom.
The main body portion is attached to a pedestal (4) in the roll chamber (1) so as to be in contact with the outer peripheral portion of the core roll (2), and a bearing (5) is embedded in the attachment portion. Furthermore, a forming groove (7) having a cross-sectional shape of the metal ring (6) is provided on the outer peripheral surface of the main body portion of the forming roll (3) over the entire circumference. A guide mold (8) is an extension of the molding groove (7) of the molding roll (3). Guide type (8) is 2
It is provided on the outer periphery of the core roll (2) between the two forming rolls (3), but in Fig. 3, the core roll (2)
The guide mold (8A) at the top of the
3), but the left end is cut off at a position some distance from the forming roll (3). The inner surface of this upper guide mold (8A) is provided with forming rolls (3) as shown in Fig. 6.
) Same as the molding groove (7) of the metal ring (6) (there is a molding groove (7) with the cross-sectional shape of the metal ring (6), but the molding groove (7) of the lower guide mold (8B) The lower guide type (8A, 8B) is embedded in the pedestal (4). 8B) has a structure in which it can be freely attached to and removed from the mounting groove α0) by raising and lowering the mounting shaft (9).There is a heating furnace cylinder (11) connected to the roll chamber (1), and the roll Room (1
) There is a material population Q2) on the partition wall, and a material cutting machine α3) is located in the roll chamber (1). There is also a product outlet O→ on the opposite partition wall. μs) is a fixed guide rail.

Obtain the material rod (b) in the shape of the desired metal ring (6) in advance, insert it into the heating furnace, and heat it in the cylinder (11) to make it plastic, and then send it on a roll. is inserted into the forming groove (7) of the forming roll (3) through the material inlet (2)), passing through the material cutting machine 03),
It is formed into a circular ring shape by going around the outer periphery of the core roll (2). At that time, the material rod (15) cut by the material cutting machine α3) has a circular ring-shaped head 05a.
) and the tail part (15b) are set so that they overlap slightly.
The joint rotational force of the core roll (2) is used to pressurize and mold the metal ring (6) in the molding groove (7), and at the same time press-bonds both ends of the ring. Therefore, at that point, if the temperature of the material rod (15) decreases and loses its plasticity, the head (15a)
Temperature control of this material rod becomes an important issue, since shaping and crimping of the tail (15b) becomes impossible. In addition to this problem, it also prevents oxidation of the material rod and improves the crimping effect by pressurization.
In order to achieve this, it is preferable that the inside of the roll chamber (1) be in a vacuum atmosphere. In addition, regarding the acquisition of the material rod (5), in this example, a metal ring in the shape of the desired metal ring is manufactured separately, and then it is placed in the cylinder (11) of the heating furnace.
For example, the molten metal melted in a high-frequency induction furnace is directly molded into a rod shape of the desired metal ring shape, plasticized, and then sent through a vacuum to the roll chamber ( 1) Implementing the method of guiding the metal ring inward saves heating energy and reduces the manufacturing cost of the metal ring.

Further, in carrying out the present invention, it is also possible to mold a material rod that does not have the cross-sectional shape of a metal ring. That is, in the case of a metal ring having a constriction according to this embodiment, the number of outer diameter rolls installed is increased by using a square bar with a plastic shape, and the shape of the molding groove is gradually changed from a square shape to that shown in the figure. Although it is possible to mold the metal ring so that it changes to the shape of the metal ring, this example is superior.

8 to 9 show different embodiments of the present invention,
The head (1) of the material rod (15) that has passed around the core roll (2)
5A) and the tail (15B) are strongly pressed. A press machine (
16), and a press mold (17) having a molding groove (7) at its tip. In this case, the core roll (2) and the forming roll (3) have a structure in which rotation is stopped every time the core roll (2) makes one rotation. Then, the core roll (2) rotates once and the material rod (b) is formed into a circular ring shape, and the part where the head (15A)' and tail part (15B) overlap is the position of the press machine (16). When it stops, the press mold (1η
The structure is such that it stretches and presses the overlapping part of the material rod (b).

[For production]

To explain the operation of the above-mentioned device, this device operates with the lower part tilted low and the upper part tilted high, as shown in FIG.
First, core roll (2) and forming roll (3) id type (8B
) to the right forming roll (3) and the upper guide mold (8).
A) and go around the outer peripheral surface of the core roll (2). At that point, the tail part (15b) of the material rod (which has already been cut to the required size by the cutting machine (13)) and the core roll (2)
- The head (15a) that has been around is inserted into the molding groove (7) of the left molding roll (3) in a slightly overlapping form, and is pressurized and molded by the joint rotational force with the core roll (2). It is crimped. The core roll (2) and the forming roll (3) are rotated at a fairly high speed because it is necessary to press both ends (15a and 15b) while the temperature of the material rod (15) is maintained at the required temperature. Since the rotation (300 to 500 r4), m), the above material rod part) rotates the core roll (2) more than 5+ times per second. Therefore, the molding time is about 1 second, but at that point, as shown in FIGS. 5 and 7, if the core roll (2) is lowered while still rotating, the roll (2)
) comes off from the inner diameter surface of the metal ring (6) after molding. Next, pull up the lower guide mold (8B) and the metal ring (
6) is a free state that is not supported by anything. Then, due to the downward force of the left forming roll (3) and the weight of the metal ring itself, it falls down the slope of the roll chamber (1). And roll chamber (1) lower product outlet 0
→ and move out of the roll room (1). Next, the core roll (2) rises and returns to its regular position, and the lower guide mold (8B)
) also descends and returns to its original position. Then the next material rod (15
) is inserted into the molding groove (7) of the molding roll (3) and the process of going around the core roll (2) is repeated. In the case of the embodiment using the press shown in Fig. 8, the rotation of the core roll (2) is stopped after each revolution to press-form and press-bond the overlapping part of the material rod (I5).
) The method of molding into a circular ring shape and the method of taking out the product are the same as in the previous embodiment.

〔Effect of the invention〕

The manufacturing method of the metal ring according to the present invention is an extremely simple method as described above (a ring-shaped material rod is cut into required dimensions, molded into a circular ring shape, and both ends are crimped together). (The device is also extremely simple.

Moreover, there is no problem that other conventional techniques have, as mentioned above, and it can be used with any metal ring having any outer diameter surface. Moreover, the most important feature of the present invention is its high molding speed. Especially when the press is not used, the product can be taken out without stopping the rotation.
It is possible to produce at a rate close to a second depending on the feeding speed of the plastic material rod. As a result, we will be able to provide the market with a metal ring that is cheaper than ever before.

[Brief explanation of drawings]

FIG. 1 is a plan view of the metal ring of this embodiment, FIG. 2 is a sectional view thereof, FIG. 3 is a developed plan view of one embodiment of the present invention, and FIG.
The figure is a longitudinal sectional view of the main part of the present invention, FIG. 5 is a developed plan view showing the state of product removal, FIG. 6 is a longitudinal sectional view of the guide type structure, and FIG. 7 is a main part showing the state of product removal. vertical sectional view,
FIG. 8 is a developed plan view showing a different embodiment of the present invention, and FIG. 9 is a longitudinal sectional view showing a state in which a press mold presses and molds the overlapping portion of the material rods. [Explanation of symbols] 1... Roll chamber 2... Core roll 3... Molding roll 4... Frame 5... Bearing 6...
Metal ring 7... Molding groove 8... Guide mold 9...
・Shaft 1o...Mounting groove 11...Cylinder
12...Material inlet 13...Material cutting machine 14...
-Product outlet 15...Material rod 16...Press machine 17...Press mold 18...Fixed guide rail.

Claims (2)

[Claims] (1) The forming roll (
3) and a guide mold (8), and a forming roll (3).
and the molding groove of the metal ring (6) on the inner surface of the guide mold (8)
7), and the material rod (15) inserted into the forming groove (7) by the rotation of the core roll (2) and the forming roll (3).
) is molded into a circular ring. (2) The metal ring manufacturing apparatus according to claim 1, wherein the overlapping portion of the material rod (15) is pressurized by a press mold (17) to form and press-bond the material rod (15).