JPH0567399B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a seal ring forming apparatus.

[Conventional technology]

Conventionally, various methods as shown in FIGS. 5 to 8 are known as methods for forming seal rings such as O-rings and lip seals.

In other words, the "compression method" shown in Figure 5
Pre-cut tube rubber ring a (same figure)
Or make a string with a rubber ring b (same figure)
, pre-form the ring-shaped raw rubber,
Seal ring groove e- of heated upper and lower molds c and d
This is a method in which the material is charged into a so-called cavity and heated under pressure.

In the "injection compression method" shown in Fig. 6, a rubber injection compression machine is used, and the upper and lower molds c and d are opened as shown in the figure before injection, and an appropriate amount of rubber material f is poured into the nozzle i. After injecting it from the sprue j and letting it flow out under the sprue j, the upper and lower molds c and d are closed by mold clamping force as shown in the same figure, and the rubber material f is rolled and flowed into the seal ring groove e. This is a method of pressurizing and heating.

Furthermore, the "injection runner gate method" shown in Fig. 7 has a structure in which the seal ring groove e is connected by a rod-shaped runner g and a gate h at its tip, and the rubber material f injected from the nozzle i is sprued. This is a method in which the liquid passes through a gate h and flows into one seal ring groove e through a gate h, and then is heated under pressure.

In addition, in the "injection cold runner method" shown in Fig. 8, another mold m is placed on the upper mold c.
A cold runner k is arranged between the sprue j and the seal ring groove e, and a distribution nozzle 1 is provided to flow the rubber material f into the seal ring groove e, and by the cold runner k, heating temperature,
This is a method of forming a seal ring while controlling the temperature of the rubber in the runner part to a predetermined temperature or less at which it will not be vulcanized in a short period of time.

[Problems to be solved by the present invention]

However, the above "compression method" (Figure 5)
In this case, a preforming process is required, and since the raw material is raw rubber, it is difficult to handle as it adheres to each other and deforms, and it is necessary to manually insert each seal ring into the seal ring groove e, which reduces productivity. The drawback was that it was bad. In addition, “Injiexyon・
"compression method" (Figure 6), "injection runner gate method" Figure 7, and "injection cold runner method" (Figure 8),
Although the supply of the rubber material f is automatically carried out by injection from the nozzle i, the removal operation has relied on manual labor as in the compression method.

Furthermore, in the above conventional technology, it is essential to perform so-called "deburring" work on the parting line created by the mating surfaces of molds c and d. Conventionally, this "deburring" work was either done manually or was expensive. A freezing tumbler method or a freezing stirring method in which the molded product is freeze-hardened by utilizing the low-temperature brittleness of rubber using liquid nitrogen or dry ice to remove the burr, or
Frozen shot blasting was used, but both methods had the disadvantage of high processing costs.

Furthermore, in recent years, equipment has become larger in order to improve productivity, making manual work such as handling molds c and d extremely difficult, and also having the disadvantage of being highly dangerous as it involves hot work. Ta.

In order to eliminate these shortcomings, automated and unmanned production processes are desired, and one possible solution is the installation of robots, but robots are expensive, and the "burrs" on the parting line mentioned above are irregularly shaped. The problem is that it is difficult to process using robots, etc., and the work becomes unstable, making it extremely unlikely that the intended purpose will be achieved.

The present invention solves the above-mentioned problems, and aims to provide a seal ring shaping device that is compact and fully automated from supplying rubber materials to taking out products without requiring any manual labor. .

[Means for Solving the Problems] The seal ring forming apparatus according to the present invention includes a feeding roll around which a rubber sheet is wound, and a feeding mechanism that feeds out the rubber sheet of the feeding roll in the longitudinal direction of the rubber sheet at a constant pitch. and a take-up roll that winds up the rubber sheet delivered at a constant pitch by the delivery mechanism;
The seal ring forming apparatus is equipped with a vulcanizing press for forming an appropriate number of ring parts on the rubber sheet from the feed roll, and a hollowing press for cutting and forming the inner peripheral surface of the ring part. A mechanism and an exterior mechanism for cutting and forming the outer circumferential surface of the ring portion whose inner circumferential surface has been cut and separating the ring portion from the rubber sheet are oriented from the feed roll side to the take-up roll side. They are arranged in sequence.

[Effect]

An appropriate number of ring portions are formed on the rubber sheet sent out from the feed roll using a vulcanization press. Next, the inner peripheral surface of the ring portion is cut and formed by a hollowing mechanism, and the inner burr is punched out. The outer peripheral surface of the ring portion with the inner burr punched out is cut by an outer punching mechanism, and the ring portion is separated from the rubber sheet to form a seal ring. Then, the rubber sheet from which the ring portion has been punched out is sequentially wound onto a take-up roll.

〔Example〕

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In FIGS. 1 and 2, reference numeral 1 denotes a seal ring molding device, which is equipped with a feed roll 3 for feeding a rolled rubber sheet 2 in the direction of arrow A, and predetermined upper and lower molds 4 and 5. and a vulcanizing press 7 for pressurizing and heating to form an appropriate number of ring portions 6..., rotating in the directions of arrows B and B and sending out the rubber sheet 2 at a constant pitch in the direction of arrow C. A feeding mechanism 8 having a pair of upper and lower rollers 15, 15, and a hollowing mechanism 10 having an appropriate number of hollowing punches 9...
, an outer punching mechanism 12 having an appropriate number of punching punches 11 connected to the punching mechanism 10, and an appropriate number of punching parts 13 formed by the punching mechanism 12 A winding roll 14 rotating in the direction of arrow D for winding up the rubber sheet 2 is sequentially arranged.

Specifically, the vulcanization press 7 presses the rubber sheet 2
A pair of upper and lower heating plates 16, 16 for heating and a pair of upper and lower heat insulating plates 19, 19 for insulating the upper and lower platens 17, 18 are provided between the upper and lower molds 4, 5 and the upper and lower platens 17, 18. A cylinder 20 and the like are provided below the lower platen 18 in a sandwiched manner and connected to a hydraulic unit (not shown) to drive the vulcanizing press 7 in the direction of arrow E.

The hollowing mechanism 10 also includes a hollowing punch 9 for punching out the ring portion 6 formed on the rubber sheet 2, and a hollowing punch holding board 21 on which the hollowing punch 9 is vertically disposed. , a cylinder 22 that is connected above the holding plate 21 and causes it to reciprocate in the vertical direction, and a hollow cylinder 22 that is formed with an appropriate number of holes 23 through which the hollow punches 9 can pass through. It consists of a die 24 and a scrap tray 25 for storing scraps punched out by the hollow punch 9. Note that the tray 25
It is also preferable to use a conveyor for discharging scraps instead.

Further, an outer punching mechanism 12 adjacent to the punching mechanism 10 punches and forms the outer periphery of the ring portion 6 of the rubber sheet 2 and separates the rubber sheet 2 from the ring portion 6 . an outer punch 11... for punching out the outer punch 11..., an outer punch holding board 26 on which the outer punch 11... is vertically provided, and a cylinder 27 connected above the holding 26 and reciprocating the punch in the vertical direction. , an outer punching die 29 that is connected to the hollow die 24 and has a hole 28 through which the outer punch 11 can pass, and the outer punch 11 .
A product tray 30 that stores the ring part punched out by... - that is, the seal ring as a product
It consists of Note that it is also desirable to use a product delivery conveyor instead of the product tray 30, and in this case, it can be connected to an automatic inspection device so that the products are sent one after another and automatically inspected continuously.

In the seal ring forming apparatus in which the main parts of the vulcanizing press 7, the hollowing mechanism 10, and the punching mechanism 12 are configured as described above, the rubber sheet 2 is fed out from the feeding roll 3 in the direction of the arrow A. Alternatively, although not shown, instead of the feed roll 3, a clamp feeder is used that clamps and slides a flat rubber sheet 2 of a predetermined length at a constant pitch, and the sheet is fed out to the vulcanizing press 7. set in place. Next, the cylinder 20 of the vulcanizing press 7 is driven to extend in the direction of arrow E to pressurize the rubber sheet 2, and heat is applied to the rubber sheet 2 by a pair of upper and lower heating plates 16, 16. After vulcanization, an appropriate number of ring portions 6 corresponding to the shapes of the upper and lower molds 4 and 5 are formed.

That is, in the case of an 0 ring as a seal ring, grooves having a semicircular cross section are provided in the upper and lower molds 4 and 5, and when pressed, the rubber sheet 2, which is the object to be pressed, has grooves formed in the upper and lower molds 4 and 5. A ring portion 6 having an inner burr 31a and an outer burr 31b on the inner and outer peripheries, respectively, is formed to correspond to the 4 and 5 shapes. The thickness dimension of these burrs 31a and 31b is approximately
It should be 0.05 or less, preferably about 0.03 or less. Moreover, if tension is applied to these thin burrs 31a, 31b, there is a risk that they will stretch and break (break). It is desirable that the rubber core portions 35, 35 be formed by forming the rubber core portions 34 into a bulging shape. The core portions 35, 35 are preferably formed using the vulcanizing press 7, and the cross-sectional shape of the core portion 35 itself can be freely set to a circular or square shape, and the left and right end edges 34 are formed as desired. , 34 in the middle, so that there are three or more.

Next, the rubber sheet 2 is delivered at a constant pitch in the direction of arrow C by the delivery mechanism 8, and the inner circumferential surface is shaped by the hollowing mechanism 10, as shown in FIG. That is, the outer diameter of the hollow punch 9 is approximately the same as the inner diameter of the ring portion 6 of the rubber sheet 2, and when the hollow punch 9 is lowered in the direction of arrow F by the cylinder 20, the virtual As shown by the line, the inner burr 31a of the ring part 6 is punched out, and the inner burr 31a is separated from the ring part 6 and passes through the hole 23 of the hollow die 24 to form a scrap tray. 25 (or carried out on a conveyor).

A rubber sheet 2 having a ring portion 6 whose inner circumferential surface has been shaped by punching in this manner.
is further fed out at a constant pitch, and as shown in FIG.
is manufactured. That is, the outer punch 11 has an outer diameter that is approximately the same as the outer diameter of the ring portion 6, and is provided with a cutting edge portion 33 having a sharp tip on its inner circumferential surface. 9 and 10 are schematic diagrams of the vicinity of the cavities of the upper and lower molds 4 and 5 of the vulcanizing press 7, and when the burr portion has a minute width L as shown in FIG. 9, the punch 9 , 11 must be sharpened (as shown in Figure 4), but the 10th
As shown in the figure, in the case of a burr-free mold that does not require finishing, it does not need to be sharp and can be easily cut by simply pressing. Then, when the outer punch 11 is lowered in the direction of arrow G by the cylinder 27 in FIG.
As shown in the imaginary line, the outer periphery of the ring part 6 is shaped, and the ring part 6 is separated from the rubber sheet 2 and manufactured into a product, which becomes a seal ring 32 and is stored in the product tray 30 (or on a delivery conveyor). (will be carried out sequentially). The rubber sheet 2, which has been punched out by the outer punching mechanism 12 to form an appropriate number of punched parts 13, is then wound up by a winding roll 14 (see FIG. 1). In this way, everything from product supply to product completion is continuous, automated, and achieves the intended purpose.

〔Effect of the invention〕

The seal ring forming apparatus according to the present invention has the following remarkable effects due to the above configuration.

While the rubber sheet 2 is being wound up from the feed roll 3 to the take-up roll 14, a ring portion 6 is formed on the rubber sheet 2, and the ring portion 6 is punched out from the rubber sheet 2, so that material supply is prevented. The process can be carried out continuously from the process to product removal, and can be fully automated, resulting in extremely high workability and shortening of work time.

Since the product rubber sheet 2 from which the seal ring has been punched out is sequentially wound around the winding roll 14, post-processing is extremely easy.

Even though this single device can perform everything from vulcanization to punching, the overall size of the device is not increased, initial costs and running costs are reduced, and energy savings can be achieved.

Since the apparatus is small, the upper and lower molds 4 and 5 of the vulcanization press 7 are also small and lightweight, and the upper and lower molds 4 and 5 can be easily and inexpensively manufactured.

It has the advantage that the overall structure is not complicated and no special factory equipment is required.

Since the weight of the upper and lower molds 4 and 5 can be reduced, the molds can be easily replaced, and can be applied to high-mix, low-volume production, allowing quick response to customer needs.

[Brief explanation of the drawing]

FIG. 1 is a simplified side view showing one embodiment of the present invention;
Figure 2 is an explanatory plan view showing the flow of the rubber sheet;
Figure 3 is an enlarged sectional view of the main part of Figure 1, and Figure 4 is an enlarged sectional view of the main part of Figure 1.
Another enlarged sectional view of the main part of the figure, and Figures 5 to 8.
The figures are diagrams explaining different conventional molding methods,
Furthermore, FIG. 9 is a cross-sectional view of an example of a mold that requires cut removal of burrs, FIG. 10 is a cross-sectional view of an example of a no-burr mold, and FIG. 11 is a cross-sectional view taken from the H-H cross-sectional direction in FIG. FIG. 2...Rubber sheet, 3...Feed roll, 4...
Upper mold, 5...Lower mold, 6...Ring part, 7...
Vulcanizing press, 8... Delivery mechanism, 10... Hollowing mechanism, 12... Outer punching mechanism, 13... Punching section, 14...
...Take-up roll.

Claims (1)

[Scope of Claims] 1. A feed roll on which a rubber sheet is wound, a feed-out mechanism that feeds out the rubber sheet on the feed roll in the longitudinal direction of the rubber sheet at a constant pitch, and a feed-out mechanism that feeds out the rubber sheet at a constant pitch by the feed-out mechanism. A seal ring forming device comprising: a take-up roll for winding a rubber sheet; a vulcanizing press for forming an appropriate number of ring parts on the rubber sheet from the feed roll; The hollowing mechanism for cutting and forming the circumferential surface and the sheathing mechanism for cutting and forming the outer circumferential surface of the ring part whose inner circumferential surface has been cut and formed and separating the ring part from the rubber sheet are moved by the above-mentioned feeding. A seal ring forming apparatus characterized in that the seal ring forming apparatus is arranged sequentially from the roll side toward the take-up roll side.