SE465259B - SET AND DEVICE FOR INJECTION - Google Patents

Description

”465 259 10 l5 20 25 30 35 2 obtains a fast and cheap procedure as well as a device for the implementation of the procedure, which in addition allows easy manufacture of even more complicated details with several cavities.

This is achieved according to the invention in that one designs a single injection molding tool with mold cavity for injection molding of both core materials and product materials and that in one or more successive steps alternately injection molds core materials and product materials, each step comprises two sub-steps, in which in one sub- the step injects core material into a mold space, which either is empty to provide a core of mold space. met form, or is partially filled in by a product detail or an aggregate, composed of core material and product material, to provide an outer surface of the assembly. the layers of core material, corresponding to the shape of the non filled the mold space and in the second stage injection molds product material into a mold space, which is either empty to provide a product detail of product material of the shape of the mold space, or is partially filled by a core or an aggregate, composed of core material and product material, to provide an outer surface of the assembly. layer of product material, corresponding to its shape unfilled mold space.

In a second procedure, one of them is injection molded sub-core material into an empty mold cavity to provide forming a core of the mold space shape and then molding in the second part, product material is taken into one mold space, which is partially filled by the core, to provide of a core completely or partially surrounding layers of plastic material, corresponding to the shape of the unfilled the mold space.

In a third process, injection molding is performed in one the sub-stage core material into a mold space, which is partial filled by a unit, composed of an inner part in shape of a core and an exterior, the core wholly or partly surrounding 10 15 20 25 30 35 465 259 3 the layers of product material to provide an aggregate the surrounding layer of core material, corresponding to the shape of the unfilled mold space, and then injection molds in the second stage product material into a larger mold space, which is partially filled by the unit, to provide coming from a unit completely or partially surrounding layer of product material, corresponding to the shape of the non filled the mold space.

In a fourth method, product materials are injection molded material into a first mold space to provide a duct detail, then in a second, larger mold space injection molding machine core material for complete or partial containment of product detail and finally in a third, even larger mold cavity injection molded product material for all or part encapsulation of the aggregates obtained in the previous steps tet.

In a fifth procedure, the sub-steps are performed cyclically in the mold space of the injection molding tool with alternating injection molding of core materials and product materials.

In a device for carrying out the invention the method comprises the tool one frame and at least two relative to the frame movable mold tool parts, the mold cavity of which in a first position constitutes the mold space for a cavity core, wherein the mold space is designed with cavities for training of anchorages for the core and the tool body is designed that, after injection molding of the cavity core, hold the cavity core at the anchoring portions while the tool parts are arranged to assume a second position relative to each other and the cavity core, so that the mold space volume is larger and corresponds to an outer contour of the product, and that the tool has ejectors for ejection from the tool of the composite assembly, formed by the core and product materials.

In a second device, the tool is arranged so that injection molding can take place in additional positions of the tool parts wherein injection molding is arranged to take place alternately ”4e5 259 ¿ l0 l5 20 25 30 35 core materials and product materials.

In a third device, the tool comprises a pair movable tool parts, which are arranged displaceably apart to produce successively larger volumes at the mold space.

In a fourth device, the tool comprises two pair of movable tool parts, of which the first pair comprises takes a mold space for core material and the other pair “ includes a larger mold space for receiving the core and injection molding of product materials in whole or in part around the core after moving from the first to it the second mold space by means of a rotatable tool body, which intervenes with anchoring parties trained on the core.

In a fifth device, the tool comprises three pairs moving tool parts, which include successively larger ones mold cavities, arranged to accommodate from the previous mold cavity moved aggregates of core and / or product material.

In a sixth device, the tool comprises four pair of moving tool parts which gradually show larger mold cavities, arranged to accommodate from the previous mold cavity moved aggregates of core and / or product material.

The invention will now be described in more detail in connection for example, as shown in the accompanying drawings, there Fig. 1 shows a section through a mold tool for a core, with the tool in position for spraying the core, Fig. 2 shows the same section but with the mold tool in position for spraying a product part, Fig. 3 shows another mold with two fixed molds. space, seen in the direction of arrow III in Fig. 4, Fig. 4 shows the tool in Fig. 3 from the side and in the open location, Fig. 5 shows a tool with three fixed mold spaces, Fig. 6 shows a double tool with two pairs of fixed molds. room, Fig. 7 shows a tool with four mold spaces for changing 10 15 20 25 30 35 5 and 465 259 injection of core materials and product materials, and Fig. 8 shows a procedure in which to begin by injection molding a product part.

In Fig. 1, 1 denotes the tool in its entirety while 2 denotes the fixed body of the tool in which two parts 3 and 4 are movable from and towards each other according to 5 and 6. The mold space 7 is limited by cavities 8 and 9 in the tool body 2 and facing mold spaces 10 and 11 in tool parts 3 and 4. By 12 is denoted one cast for core material to the mold cavity 7 from the injection the unit 13. When injection molding of core material is formed a core 7 'in the cavity 7.

In the position shown in Fig. 2, they are both movable tool parts 3 and 4 are each displaced according to the arrows 5 and 6 a distance 14 from each other so that a cavity formed between the core 7 'and the walls of the mold spaces 10 and 11. Through the core parts formed in the cavities 8 and 9 in the tool body 2, the core 7 'is held in place inside the new, larger mold space, created by the tool parts 3, 4 displacements 5, 6. By one not shown in the figure ingot, product material for the product 15 has been injected into the mold cavity and enclosing the core 7 '.

The unit composed of core and product material 7 ', 15 have thus been obtained in one and the same tool in one and the same injection molding machine, which according to the invention is equipped with two injection units, ie one unit for core materials and a unit for product materials.

You have thus saved time and transport costs through to use a mold tool with a mold space, the volume of which increased one step. When finally removing the core 7 'has the finished injection molded product 15 has been obtained with its cavity.

In Fig. 3, the tool has two inserts denoted by 16 and 17, which are mounted on a frame 18, which can rotate or turn 1800 according to the arrow 19. In the insert 465 259 10 15 20 25 30 35 a core 20 is taken for the cavity in a 900 pipe bend 23. The core has two anchoring portions in the form of tumors 21 and 22 at its ends. When the tool and its inserts 16 and 17 has been opened, which is described in more detail in connection with Fig. 4, the core is held by the anchoring portions 21, 22 and moved to the Tool insert 17, after which the tool get closed. The mold space in Tool Insert 17 is larger volume than the mold space in the insert 16 and has the shape of the outer surface of the bend 23. When injecting product material through an injection channel 24 the pipe bend 23 is formed, which is together with the core 20 constitutes a composite assembly. When When the tool is reopened, this composite part is ejected at the same time as the frame 18 through 1800 rotation moves one new core with its anchoring portions 21, 22 from the tool insert 16 to Tool insert 17.

Figure 4 shows the tool in figure 3 in open position. Reference the numerals denote the same details as in Fig. 3. except denotes a center part which is rotatable according to arrow 19, and displaceable according to arrow 26. The center part is fixedly connected to the rotatable body 18 of the tool, which thus shifting 26 and rotating 19 together with the center the room part. The figure shows how the pipe bend 23 with the core 20 is supported at the anchoring portions 21, 22 of the core by the fabric body 18.

Figure 5 shows a tool with three tool inserts 27, 28 and 29, arranged at 1200 distances on a rotatable frame 30. The tool insert 27 fully corresponds to the tool insert. kit 16 in Fig. 3. When the tool is opened, turn the body At an angle 1200 whereby the core 20 is moved to the tool insert 28, which has no ingots but only constitutes a cooling station for the core. This may for some combinations nations of nuclear and product materials be advantageous to obtain a faster production cycle.

Figure 6 shows a tool with two pairs of tool inserts 31 and 31 'and 32 and 32', respectively. When injection molding of core material, two cores are obtained simultaneously, one in each 10 15 20 25 30 35 '7 l 465 259 insert 31 and 31 '. After opening the tool and 900 rotation of the body 33, on which the tool inserts are mounted, the two simultaneously sprayed cores are placed in the inserts 32 and 32 'in the same manner as described in in connection with Figures 3 and 4. The product material is then injection molded. material to provide a composite assembly 20, 23 as previously described. In a procedure according to that described, a very fast production cycle can be achieved.

Figure 7 shows a method in which the injection molding takes a product with complicated cavities by using turn and order in different successive form spaces with increasing size volume sprays alternating core materials and product materials.

In the procedure shown in the figure, the same has been used core material in both sprays. The same goes for the product material. This is not necessary, you can do a lot well use up to four different materials, one for each injection molding.

The injection molding in one sub-stage of the first stage is carried out raised with core material in the tool part 35, in which a bent core 36 with a protrusion 37 is provided. The tool opens and the core held by its anchoring portions and floating is taken to the tool part 39 by a rotation 900 in the arrow 38 direction. In the larger mold space in the tool part 39 injection molded in the second stage of the first stage of the product material through the ingot 24 so that a pipe bend 40 is provided.

At the next opening of the tool and turning 900 in direction 38, the assembly 36-40 is moved to a tool part 41 with even larger mold spaces. In the second stage one sub-stage, core material is injection molded through the ingot 43, which is a connection between the tool parts 35 and 41 so that a Z-shaped core portion 42 is provided. Injection molding of core material thus takes place simultaneously in the tool parts 35 and 41 After re-opening the tool and turning 900 has the unit 36-40-42 has been moved to one last tool part '465 259 a' l0 l5 20 25 30 35 44 with an even larger mold space. In this tool section 44 injection molding takes place in the second sub-stage of the second stage of product material so that the knee portion 42 is partially surrounded by product material. Because the ingot 24 'is connected with the ingot 24, injection molding of product material takes place simultaneously in Tool Parts 39 and 44.

The tool parts 35, 39, 41 and 44 are movably connected with the tool body in mutually immutable positions. The increasingly complex aggregate of core and product materials material is moved between the mold parts of the tool parts with the aid of of a rotatable tool body, in principle designed and functioning as described in connection with the body 18 in FIG 4. A cyclic process is obtained with the described process manufacturing process, which is very efficient and rational and has a low cost because it avoids a time-consuming and expensive movement of the injection molded unit between different tools in different injection molding machines. After removal of the core material then a complicated one is obtained product of product material with different cavities.

Figure 8 shows a procedure, which in principle differs from the procedures described in connection with Figures 1-7. those at which a core was first injection molded. Here form- you first spray a product part 46 into a tool part 45 through the ingot É4. After opening the tool and turning of the tool body 1200 in the direction of the arrow 49, the the product part 46 with its anchoring portions in a tool part 47. In the manner previously described, an approx spherical core 48 around the product part 46. Thus obtained unit is moved at the next opening of the tool go and turn 120 ° to the mold space in the tool part 49.

When injection molding product material through the ingot 24 provided an approximately spherical wall 50 is formed, which in injection molding the connection is connected to the original product detail 46.

Injection molding of product materials takes place simultaneously in tool parts 45 and 49 through the ingot 24. Also in this procedure they obtain a cyclical and efficient production. l0 15 '' 465 259 In the above example, the core material is intended to be an easily molten metal alloy, with a low melting point while jen's material is thought to be plastic with a higher melting point. This is not necessary, the main thing is that the two materials len have melting points, which relate to each other at specified way. You can also choose a core material, such as is soluble in an acid or even in water. Also other modi- Conferences may be made by one skilled in the art within the scope of the claims.

The procedures described are examples only. Also with regard to the design of an injection molding tools arranged for injection molding of both core materials as product material, can other designs than those as examples provided by a person skilled in the art within the scope of the claims.

Claims (11)

~ 4e5 259 ¿0 '10 15 20 25 30 Patent claim A method of injection molding by means of a molding tool constructed of a body and several movable tool parts for producing products with cavities of the desired shape, wherein an injection molding corresponding to a removable core is injection molded, for example of easily digestible or liquid-soluble material, and that or next to the core another material injector, the product material, which material forms the finished product, characterized in that a single injection molding tool is designed with a mold space for injection molding of both core material and product material and that in one or more successive stages alternating injection molds core material and product material, each step comprising two sub-steps, in which in one sub-step core material is injection molded into a mold space, which. either is empty to provide a core of the shape of the mold space,. or is partially filled by a product part or an assembly, composed of core material and product material, to provide a layer of core material lying on top of the assembly, corresponding to the shape of the unfilled mold space, in the second stage injection molds product material into a mold space , which. either is empty to provide a product detail of product material of the shape of the mold space,. or is partially filled by a core or assembly, composed of core material and product material, to provide a layer of product material lying on top of the unit, corresponding to the shape of the unfilled mold space. 10 15 20 25 30 35 '465 259 H 2. A method according to claim 1, characterized in that in one sub-step core material is injection molded into an empty mold space to provide a core of the mold space shape and that in the second sub-step product material is injection-molded into a mold space, which is partially filled of the core, to provide a core completely or partially surrounding layer of plastic material, corresponding to the shape of the unfilled mold space. 3. A method according to claim 1, characterized in that in one sub-stage core material is injection molded into a mold space, which is partly filled by an assembly, composed of an inner part in the form of a core and an outer layer completely or partially surrounding the core. of product material to produce a layer of core material surrounding the assembly, corresponding to the shape of the unfilled mold space, and then in the second stage product material to be injected into a larger mold space, which is partially filled by the assembly, to provide a complete or partial assembly of the assembly. surrounding layers of product material, corresponding to the shape of the unfilled mold space. 4. A method according to claim 1, characterized in that in a first mold space product material is injection molded to produce a product part, then in a second, larger mold space injection molded core material for complete or partial enclosing of the product part and finally in a third, further larger mold space injection mold product material for complete or partial enclosure of the unit obtained in the previous steps. Method according to one of the preceding claims, characterized in that the sub-steps are carried out cyclically in the mold space of the injection molding tool with alternating injection molding of core material and product material. Apparatus for carrying out the method according to claim 1, in injection molding tools for producing products with cavities of desired shape, wherein the cavity of the product 465 '259 10 15 20 25 30 is provided by means of a removable core, which is then completely or partially surrounded by injection molding by a product material, which designs the finished product, characterized in that the tool comprises a frame and at least two relative frame and mutually movable mold tool parts, the mold cavity in a first position constitutes mold cavity for a cavity core, the mold cavity being formed with cavities for forming anchoring portions for the core, that the tool body after the injection molding of the cavity core is arranged to hold the cavity core at the anchoring portions while the tool parts are arranged to assume a second position relative to each other and the cavity core so that the volume of the mold space is larger and corresponds to an outer contour of the product. exhibits ejection for ejection from the tool of the composite assembly, which is formed of core and product material. Device according to claim 6, characterized in that the tool is arranged so that injection molding can take place in further positions of the tool parts, whereby injection molding is arranged to take place alternately of core material and product material. Device according to claim 6, characterized in that the tool comprises a pair of movable tool parts, which are arranged displaceable from each other to provide a successively larger volume of the mold space. Device according to claim 6, characterized in that the tool comprises two pairs of movable tool parts of which the first pair comprises a mold space for core material and the second pair comprises a larger mold space for receiving the core and injection molding of product material completely or partly around the core after movement from the first to the second mold space by means of a rotatable tool body, which engages with anchoring portions formed on the core (Figs. 3, 4). 465 259 10. Device according to claim 6, characterized in that the tool comprises three pairs of movable tool parts, which comprise successively larger mold spaces, arranged to receive aggregates of core and / or product material moved from the previous mold space (Figs. 5, 8). 11. Device according to claim 1, characterized in that the tool comprises four pairs of movable tool parts which comprise successively larger mold spaces, arranged to receive aggregates of core and / or product material moved from the previous mold space (Figs. 6, 7).