DE1704359C - Press tool for the production of sealing rings - Google Patents

Description

the clamping ring (36) and an upper basic limit can fluctuate,

Plate (30) is arranged and with the press 20 according to the invention open, this object is achieved by

tool the shoulders (37, 38) together in a first between the lower mold half and a

Holds engagement. Base plate arranged compression spring and a second

2. Compression tool according to claim 1, thereby- compression spring which is between the clamping ring and indicates that the lower mold half (15) is arranged in an upper base plate and is open-indrisch formed and in the outer diameter 35 of a pressing tool the shoulders with one another in one (16) handle is smaller than the diameter of the inner surface.

of the cylindrical metal shell (26). This device has over the known

3. Press tool uach claim 1 or 2, that press tools of the type mentioned characterized in that an 'est on the advantage that when pressing is always a uniform Base plate (10) arranged die support plate 30 pressure is exerted on the molding. this will (11) has a cylindrical opening (12), caused in by the compression springs, which between the which the lower mold half (15) is guided. Mold halves and the corresponding base plates

4. Press tool according to claim 2 or 3, there are arranged. When closing the press tool characterized in that a stripper plate is the lower mold half against the action of the he (48 ') the lower mold half (15) encloses the 35 most compression spring down and the comb ring against on the outer surface of the metal jacket (65) - grasps the effect of the second compression spring upwards, away. The two compression springs enable the

5. Pressing tool after one of the preceding ring of the mold parts achieves a flexibility which it the claims, characterized in that it enables inobere when closing the pressing tool The mold half (31) has a pressure web (35) on the inside of the material which forms the sealing ring indicates that the excess material is to be deformed when closing, to maintain uniform pressures shears off. ten. When the mold is closed, the

6. Press tool according to claim 5, characterized by the upper mold half against the force of the second pressure, that in the closed state it moves even further downwards when the one adjoining space (33: 21) for receiving the clamping ring is already in contact with the metal jacket Material sheared off by the pressure bar has escaped. The pressure that is then caused by the holds. upper mold half exerted on the sealing ring

depends essentially only on the spring constant of the second compression spring, regardless of

50 the manufacturing tolerances of the lower mold half 15,

in particular their pressure web, as well as the possible fluctuations in thickness of the ring wall of the metal man-;

tel.

The invention relates to a pressing tool for the manufacture of sealing rings made of elastic material 55 tion of the ring or the ring wall of the metal man- j

with a cylindrical metal jacket, which on one means even when using several forms or pressing;

End inwardly shaped as a ring, with a sub-tool in a single molding press is constant and ■

Ren and an upper mold half and one the upper only depends on the second compression spring. The first Mold halves surrounding clamping ring, which enables a school compression spring, that the mold halves ter has that on a corresponding shoulder of the 60 or molded parts when further compressing the upper mold half can be pressed, and one on the clamping plates or clamping tables of the mold clamping ring The pressure bar provided for the clamping press is shifted even further against the base plate men of the ring of the metal jacket against a pressure can be after the pressure web on the lower web the lower mold half. ren mold half has come to the plant. This means-

Known pressing tools of this type. (USA.-Pat tentschrift 3 275 729), the pressure bar is usually always with the same in the single largest compression molding press A number of between the upper and lower press pressure is applied to the lower mold half. Will the table arranged by compression molding machines. The manufacturing spring constant of the first compression spring is chosen so that

the lower half of the mold can be fastened and stored during the deformation of a molding press. Firmly on

mens of the sealing material according to unk-n r., so the base plate 10 is a die support plate 11 with

it is ensured that both openings are provided inside the mold cavity, which have a cylindrical opening

Raumcs of a certain shape as well as - at the same time - 12 to the Fonnaufnahme.

early use of several forms or pressing 5 In the cylindrical opening 12 sits a lower

werkzLiiue— the pressures in the various form washers 13, preferably made of hardened steel

cavities are perfectly uniform and from this a compression spring 14. The illustration shows a

schlie! -iii '- h ^von ' ^{! er} spring constant of the first compression disc spring.

depend on the spring. A lower mold half 15 sits on the spring 14,

According to a preferred embodiment of the io whose outer diameter 16 is dimensioned so that the Invention ί ': πκ i; s provided that the lower mold half with a sliding fit in the openings of the häifiv / \! indi. ch formed and in the outer die support plate 11 encloses. The lower half of the mold mes-J! "smaller than the diameter of the inner surface 15 has a cylindrical extension 17 in the part . ·> Is already a metal jacket. Also ".ann it is performed by spring springs 14. Through the approach 17 vorüc-chen *one. that one is firmly attached to the base plate through a screw 18 that goes into the lower georJ: K-: e die support plate a cylindrical off-base plate 10 is screwed in: and a head 19 well.- Aii points. in which the lower mold half is guided on a shoulder of the lower mold half is attacking IS and their downward movement regarding

! L further embodiment of the invention of the base plate 10 is limited. L ^f et the head 19 on the

2έ'Λ ~ -t Mch from the fact that an abM'-iifcrp-atte ao shoulder. so is the concern of the approach

enclosing the goal mold half, which on the outer 17 a little above the washer 13

fhv attacks the metal jacket. Although the mold half 15 has inwardly facing cylindrical

US Patent 3 W 884 already has a Vomt-h-drical walls 20 and 21 for one below to l> e

door has become known for the purpose that appears to be a sign.

ei; ii ■ "includes sealing ring, but it is 35 As can best be seen from F 1 g. 2, the

dv ^{] is} not a pressing tool with the lower mold half 15 according to the invention in the upper area in the vicinity

envisaged features. the circumference of the autoclave a pressure web 22 as well as

^For the compression springs, it is expedient 23 that part of the outer surface of the

ßi. : be wise to disc springs, as these determine the relative size of the sealing ring.

At-: take up space and a large spring cone 30 An annular wall 24 extends radially from the surface

μ '. · can have. There are also those, one on top of the other, with their inner edge in the cylindrical

dv stacked disc springs are advantageous because drisch · .: wall 21 merges. A second, a circular

d; ■ λ, the position of the individual spring arrangement in the wall 25 forming the annular surface extends between

a; -Luminous deflection increases rapidly, namely see the cylindrical walls 21 and 20.

b: υ an essentially constant value above 35. The pressing tool is made with a ring IAA

, j entire spring characteristic. loaded with uncured material. : \ ζτ on the

/ to At, chefen of the excess material annular wall 24 is arranged; a cylindrical m

r-: 'π Closing the mold, the upper mold half tallmantel 26, which at one end inwardly as a ring

i. : - .. ·.! Have pressure bar. In doing so, the press-molded part is supported on the mold half in such a way that it

>'.. Tool con tro preferably a 40 that its inner annular wall 27 arrival at the printing web 22 in the closed condition

N ^ en space to take up the lies through the pressure bar,

y. sheared material. The pressing tool also has an upper basic

The finding is based on an execution plate 30. which is located on the upper press table of the

! Example explained in detail. It shows molding press can set and an upper one

FIG. 1 shows a partial section through an open mold half 31, for example by means of a screw

Press 32, which has already been charged for a work process, is attached.

tool, the upper mold half 31 has a cylindrical

F i g. 2 ″ A similar view as in FIG. 1 in twisted projection 33, the diameter of which is so dimensioned

enlarged view , the shape or the press that is a Gleitpnssung with the cylindrical wall

tool is given in the fully closed state ge 5c 2C of the lower mold half . A second

shows , overlying cylindrical wall 34 at the top

F i g. 3 on a further enlarged scale, the individual mold half is designed so that a movement seat

th of the clamping ring in partial section, with the wall 21 of the lower mold half is given.

F i g. 4 in a representation similar to that in FIG. A pressure web 35 points from the upper mold half 31 Press tool, which is used for the production of double 55 down "nd is opposite the wall 34 after

lip seals are used, offset on the outside.

F i g. Fig. 5 shows another embodiment of a press- The upper mold half 31 is of a clamping ring

Tool, 36 with a downward-pointing shoulder 37

F i g. 6 that shown in FIG. 5 shown pressing tool in ben, which is in engagement with the upwardly facing fully closed, 60 shoulder 38 of this mold half comes. The mold half

F i g. 7 is a partial section through a modified 31 is surrounded by a compression spring 39 which is attached to a In the form of a sealing ring, which corresponds to the shoulder of the clamping ring 36 as well as a hardened one in fig. 5 and 6 explained execution works, on the upper base plate 3β resting under game can be produced, and washer 40 is applied. The spring 39 pushes the

F i g. 8 shows a representation similar to that in FIG. 7. 65 clamping ring 36 down and holds the ^Schu ^ ^er Jl r *

According to FIGS. 1 and 2, the invention and 38 in engagement with one another. The spring 39 is also

The press tool would have a lower base plate 10, designed as a disc spring. .

Hie on the lower press or clamping table on the upper mold half 31 and the clamping ring

36 forming surfaces 41 are provided which determine the shape of the inner surface of the sealing element.

From Fig. 2 it can best be seen that during the closing movement of the press the pressure bar 35 engages the ring 24 A made of malleable material and presses it into the cavity formed between the upper and lower mold halves. During this movement, the cylindrical extension 33 slides along the wall 20 of the lower mold half and thus ensures an alignment of the mold half with respect to one another. A further downward movement of the upper mold half 31 squeezes off excess moldable material which flows into the adjacent space formed between the walls 33 and 21 of the mold halves. During the pressing process, the lower mold half is pressed with the pressure bar 35 against the resistance of the compression spring 14 downward, as indicated by the distance 42 between the head 19 of the screw and the surface of the projection 17 of the lower mold half. During this downward movement of the upper mold half 31, the clamping ring 36 grips the annular wall 27 of the metal jacket before the downward movement has ended; with a further downward movement, the clamping ring 36 moves upwards against the resistance of the compression spring 39. With this arrangement, the metal jacket is clamped on the lower mold half under precisely controlled pressure.

The clamping ring is made of hardened steel. As best seen in Fig. 3 has the clamping ring 36 at the lower end face a lip 44 which rests against the upper mold half 31 without play. Through this the molding becomes burr-free at this point. The surfaces 41 of the upper mold half 31 and the lip 44 form the inner surface of the mold cavity. The surface 41 on the clamping ring goes into a small pressure bar 45 above, which points downward from the bottom face 46 of the ring. For example, the web 45 be offset from the bottom face 46 by 0.18 mm. When the mold is fully closed, the web 45 presses the ring wall of the metal jacket downwards, so that the connection point between the sealing lip and jacket passes without a burr.

The in the F i g. 1 and 2 shown metal shell 26 includes a cylindrical inner wall portion 47, the Centering of the jacket on the lower mold half 15 in engagement with the inner surface of the pressure web 22 comes on the lower mold half. The cylindrical outer wall contacts the outer surface of the lower one Mold half 15 not with the press tool shown. So are sealing rings with metallic jackets manufacturable, in which the diameter of the outer walls vary considerably. Because the pressure bar 22 of the lower mold half and the pressure web 45 of the clamping 36 both with a small area in contact with the metal jacket, the pressure between the bars and the jacket is sufficient to to make the shape burr-free at the junction of the sealing element and the jacket. The surface of the pressure web 35 is also small, which means that the pressure exerted by it on the surface 24 Sufficient pressure to make the molding essentially burr-free at this point.

When the mold is closed, the lower half of the mold pressed against the resistance of the compression spring 14 downwards. Since the spring 14 is designed as a disc spring If the resistance rises quickly at first, then remains essentially over the greater part of the Deflection area constant and then drops as the spring approaches the flat state. at In the shape shown, there is no complete deflection of the spring, so that the spring force is in wesentli-S chen is constant.

The characteristic curve of the plate spring 14 leads to an even pressure between the molded parts and even if the molding device is provided with several mold cavities. It will be a

ίο even pressure on the material in the different Ensure cavities in the device during the entire process of the pressing process. As a result, the production of sealing rings of uniform quality by the invention Press tool ensured, although the dimensions of the molded parts within certain Grenon can fluctuate.

At the end of each work cycle! Ic form opens. The upper press table moves to υ "· ι. ■

ao By this movement, the lower mold half 15 is relieved of pressure; the spring 14 can be again detected c ie shoulder of the lower mold half because, until the head 19 of the screw 18 upward. . The device also has a wiper plate

as 48 has an opening through which the lower foot half 15 passes. The base plate 10 < J die support plate 11 contain bores 49, ie. ·. > which the ejector pins (not shown) of the Pn. ·: are guided. These pins move the plate ² .

up to the finished sealing rings from c. r to strip off the mold half. The finished gasket. · As well as the surplus material in the specified adjoining rooms are then removed before the preparation ύ · device for the next work step

The shape shown in Figs. 1 and 2 is ΚΊ the molding of a sealing element with a.! laid out towards the lip. In Figure 4 is a modified ·; Embodiment of the invention explained, with the cn double-lipped sealing element is formed.

In the embodiment shown in FIG. 4, the lower mold half 15 and the associated eminent features have remained unchanged. The upper mold half consists of two parts 31 A and 31 B, with part 31 A on the upper, not shown, clamping

or die support plate is fixed by a screw 55 on a shoulder 56, which is this part of the

Grips the mold half and ucim it on the base plate

Screwing in the screw bolt stuck.

The lower part 31 B has a shoulder 57 which

comes with the head of the screw engages and holds this part below the portion 31 A at the open press. The part 31 B has a pressure web 58 which comes into engagement with the annular wall 24; a cylindrical wall 59 of the part 31 B is designed so that it is a

Forms a sliding fit with the wall 20 of the lower half of the mold 15. The part 31 B also contains a further pressure web 60.

When the press is moved into the closed position, the pressure web 58 engages the moldable material on the annular wall 24; the part 31 B is then moved upwards by further movement of the press, this movement continuing until the upper side 61 of the part 31 B engages the molded part 31 A , the pressure web 60 coming into contact with the surface 62 and one of the second

Sealing lip-forming mold cavity closes When the press moves into the fully closed position, so the pressure web 58 engages the annular wall 24 and closes after squeezing off superfluous material,

which falls into the adjoining room - as before - which has a greater radial thickness than the ring 36, in the usual

Cavity. The metal jacket 26 is formed on the rigen but is the same. In Fig. 6 the in

Pressure web 22 through the clamping ring 36, as previously shown. 5 molding device shown in closed

feels, stuck: stuck. shown in a state. At the end of the molding process

At the end of the working cycle, the 5 opens and the ejector press (not shown) lets the part 31 B fall off the part 31 A , pins pass through openings 49 and, as a result, the shoulder 57 again lifts the ring 68 on the head of the screw and the plate 48 ', whereby the finished 55 comes to rest. Another upward-moving sealing ring is stripped from the mold
supply strips the molded part 31 B from the sealing ring; 7 shows a jacket with an offset part, after which the sealing ring of the stripper 75 is shown in the ring wai.d with which the elastic plate 48 is stripped off. Material is connected. According to FIG. 8 the man

In Figs. 5 and 6, the metal jacket 65 is a tel a frustoconical part76 with which the

Sealing element is connected to a cylindrical outer elastic material. It is here

wall shown, of which at one end a ring around examples of shell shapes that are used in the in F i g. ^ς

wall 66 protrudes radially inward. The lower mold- 15 and 6 shown molding device can be used

half 15 'corresponds to the mold half 15, only that it shows that the arrangement is below

Pressure web 67 is arranged so that in the hollow resilient mounting of the lower mold half and below

space part of the annular wall 66 is added; Use of a spring loaded

Again, the bonding area is large enough to hold the clamping device on both the upper mold half

Sealing element to be securely attached to the jacket. χ for molding devices with a single as well as with

The stripper plate 48 'surrounds the lower mold - several cavities bring advantages. The arrangement

half 15 ', the opening between the lower half of the mold ensures even pressure on the

and the stripper plate 48 * a centering ring 68 rial in the mold cavity, regardless of the dimensional

A rib 69 on the ring 68 extends due to differentiated in the mold half parts

a peen hole ^ the flat? 48 '. The wall of the »5 of existing manufacturing tolerances, for sure. the

Metallmancls 65 encompasses the ring 68, whereby the shapes are simple, robust and insensitive

Jacket is centered on the mold half 15 '. Hch and can be informed about a large number of PreLV

The upper mold half 5 \ is to be operated just like in Fig. 1, before an overhaul is necessary.;:

formed and has a clamping ring 36 'which becomes a.

1 sheet of drawings

Claims (1)

tolerances in the production of the individual mold parts and the metal jacket lead to the fact that when pressing on the sealing material is in the individual 1. pressing tool for producing dense pressing tools and at the same time within a _r a tung rings made of elastic material with a single pressing tool 5 at different points _z e cylindrical * N '"! Coat, of an uneven pressure is applied at one end. This w is shaped as a ring inside, with a lower disadvantageous because place a proper shapes and off and an upper mold half and the upper cure of elastomers, the application of a DC _st mold half surrounding clamping ring which has a uniform pressure and a given Temperature f _t shoulder, which requires a corresponding io during a very specific time. Shoulder of the upper mold half is pressable, and the invention is based on the object of a £ to create a pressure-pressing tool of the type mentioned provided on the clamping ring, at Ii bar to clamp the ring of the metal mandrel an even pressure over the entire r means against a pressure bar of the lower mold cavity of a specific pressing tool and _t half, characterized by a first 15 also in the hollow spaces of several adjacent \ between the lower mold half (15) and one of the between the clamping tables of a compression molding press ί Base plate (10) ^ ordered compression spring (14) arranged pressing tools is maintained, and a second compression spring (39) which, although the dimensions of the molded parts within