JPH0429528B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an injection molding process in which, using an injection molding machine, the plastic to be processed is injected into a mold located in the injection molding machine and having one or more separating surfaces. The present invention relates to a method and an apparatus for producing plastic products by subjecting the body to a compression treatment in a mold during a cooling phase and subsequently to at least one compression deformation using a new mold cavity.

It is already known from DE 28 56 580 A1 to carry out the structure-forming process by special compressive deformation during the primary forming or cooling after deformation or in a separate working step. In this case, the starting point is an extruded, cast or injection molded semi-finished product and compression deformation is carried out. A particular disadvantage of this method is that, depending on its external shape and thickness, the shaped body may not be dimensionally stable and/or may have defects (for example, skin breaks).

Furthermore, this compressive deformation method is not possible for molded bodies whose projected area in the direction of movement of the deformed rod is larger than the projected area of the deformed rod.

It is an object of the present invention to avoid the above-mentioned disadvantages and to provide a method as described in German Patent Application No. 28 56 580, as well as an apparatus used in this case for producing plastic products and, if appropriate, the production thereof. The goal was to improve the products that had been manufactured.

According to the invention, while using the method for producing plastic products, the plastic to be processed is placed in an injection molding machine, which has one or more separating surfaces under the use of the injection molding machine. injection molding into a mold cavity, during cooling of the plastic an injection molding takes the form of the mold cavity, which is subjected to a compression process in the mold cavity during the cooling phase, during which a new It has been confirmed that the above-mentioned problem can be solved by applying at least one compression deformation (compression stretching) while using a mold cavity.

The injection molded body is cooled in the mold cavity during the cooling phase using one or more hydraulic or pneumatic cylinders of the injection molding machine.
If produced at a height of 50 000 KN, preferably 150 to 10 000 KN, and using a new mold cavity, the injection molded part is subjected to a pressure of 100 to 800 N/mm ² , in which case the clamping and deforming forces Alternatively, the compression and stretching forces can be controlled separately.

The hydraulic or pneumatic cylinder is preferably connected to a core displacement device which is connected to the injection molding machine, in which case the core displacement device of the injection molding machine has a pressure of 1 to 100 N/mm ² ,
It is preferably operated at a system pressure of 4 to 25 N/mm ² .

According to the present invention, it is possible to obtain plastic products with high quality (especially strength) and good dimensional stability, since the mold clamping force and the deformation force or compression-stretching force can be controlled separately. can.

Also, since the deformation rate is controllable according to the invention, skin breakage and other quality deterioration are largely avoided by the method.

According to one advantageous embodiment, the plastic is injected from the nozzle 1 into the mold cavity,
In this case, the parting surface of the mold is closed by a corresponding clamping device of the injection molding machine. During the cooling of the injection molded body or plastic article 4, the new mold cavity or a part of the new mold cavity is opened to the injection molded body or plastic article by opening the separating surface 25 or several separating surfaces on the fixed or movable side. brought to the working position,
and by closing the mold again after removing the spacer plate 2 or a similar plate or mold part or mechanism, the compaction is carried out using a correspondingly adjustable pressure, preferably an infinitely adjustable pressure of a mold clamping device. Deformation or compression stretching is performed.

According to this embodiment, compression deformation or compression stretching of plastic products etc. can be carried out quickly and continuously. It is also possible to compress, stretch or otherwise deform the plastic product, for example by deforming at right angles to the direction of the clamping force, over the protruding area of the injection molded body, thus completing objects of various shapes. is expanded by this method.

Plasticization and mold filling are carried out using an injection molding machine and a mold connected thereto. in this case,
The injection molded body is subjected to compression deformation (compression stretching) in the mold during the cooling phase and is subsequently subjected to further compression deformation (compression stretching) in a new or partially new mold cavity. , in which case the time selected between these two compression deformations is adjusted depending on the cooling and recovery behavior of the plastic.

According to one embodiment, the plastic introduced into the mold cavity of the injection molding machine contains inorganic and/or organic fibers, fillers and/or reinforcing agents. According to one embodiment, these fibers, fillers and/or reinforcing agents have a completely or partially asymmetrical shape. By using these asymmetric fillers and/or reinforcing agents, desired orientations can be obtained in plastic objects, plastic products, etc.

The plastic compound charged into the mold cavity of the injection molding machine contains 0.1 to 80 parts by weight, preferably 5 to 45 parts by weight of inorganic and/or organic fibers, fillers and/or reinforcing agents and plastics per 100 parts by weight. 99.9~20 parts by weight, advantageously 95~
55 parts by weight, optionally using additional processing aids.

The fiber content in plastic is 0.01 to 10
It is preferred to have a fiber length of mm, preferably from 0.05 to 5 mm.

Various materials, plastics or plastic compounds can be used for the new mold cavity or partially new mold cavity, in which case the finished product thus obtained (up to possible dimensional deviations in the direction of movement of the deformed rod) can be used. )
have the same dimensions.

By using the method according to the invention, it is possible to produce plastic products which, when compared with the method known from DE 28 56 580, lead to less or no skin rupture. or finished products, compressed stretched or deformed plastic products and/or
or thick-walled plastic products with few or no cavities can be finished by automated equipment from reinforced and/or filled or unreinforced and/or filled plastics and are optimally finished. and the dimensions can be completed accurately. Furthermore, West German Patent Publication No. 2856580
In contrast to the method described in the patent, it is also possible to produce complex plastic products, for example gears.

According to a further embodiment of the method according to the invention, the injection molded bodies are injected simultaneously or almost simultaneously with a nozzle, preferably a submerged nozzle, which is in moving contact with the mold cavity insert on the fixed side for the injection molded body. At the same time, the already injected second injection molded body is deformed in the mold cavity insert for the finished product under compression by a compression-stretching rod, the sprue is separated, the mold is opened and the immersion nozzle is withdrawn. Injection molded body on the fixed side with corresponding core and core shape.
Alternatively, after removing the finished product from the cavity insert and swiveling the corresponding template or sets of templates on the movable side of the mold, the finished product is ejected or released from the mold, preferably at 180 mm. After the end of the swiveling movement of ° and when the mold is closed, the core of the one compression-drawing rod is inserted with the injected and contracted injection molding into the mold cavity insert for the finished product, and The free core of the compression-stretch rod is inserted into the mold cavity insert of the injection molded body.

The compression deformation of the injection molded product by the compression-stretching rod is performed by the force of the mold clamping device of the injection molding machine while compressing several sets of leaf springs placed between several sets of mold plates on the movable side after closing the mold. Preferably, this is carried out using one or more hydraulic or pneumatic cylinders.

Advantageously, the leaf spring and/or the mechanical locking device and/or the hydraulic locking device keep the separating surface closed exclusively during the injection process of the injection molding, the compression and stretching process and the subsequent pressure holding time.

Furthermore, it has proven advantageous to carry out the injection molding of one injection molded body by compression stretching within the time of the deformation of another injection molded body.

Furthermore, the invention relates to an apparatus for producing plastic products, advantageously using the method according to the invention. The apparatus consists of an injection molding machine and a mold having one or more separating surfaces. According to the invention, the injection molding machine can be used both as a press that closes the parting surfaces of the mold during injection and as a press that deforms the injection molding one or more times (compression stretching) and/or after forming the molded body. It is also designed as a processing press, in which case the mold clamping device consisting of a mechanical device for closing the mold between injection moldings is used to close the mold for injection molding of the injection molding or plastic product. It is used to close the separation surface and is subsequently used as a press for one or more deformations (compression-stretching) and/or further processing into shaped bodies in a separately controllable manner.

The mold has one or more slides controlled by the core extraction device, which slides on the fixed or movable side move the corresponding mold cavities into their respective working positions. In a first working step, the injection molded body is injected and is injected without opening the separating surface or after opening the separating surface by a sliding movement using a hydraulic cylinder connected to the core drawing device of the injection molding machine. Place the molded body or plastic article into the second mold cavity,
It is introduced and deformed under the cooperation of the mold clamping device of the injection molding machine as a press.

The core displacement device and the hydraulic cylinder are advantageously designed as a press for deformation (compression-stretching) and/or post-pressing.

According to one embodiment, the external hydraulic device is configured as a press for deformation (compression-stretching) and/or post-pressing.

According to one preferred embodiment, leaf springs and/or mechanical locking devices and/or hydraulic devices are arranged in the mold or mold part, which can be separated during deformation or compression-stretching and/or post-pressing. Close the surface.

According to another particularly advantageous embodiment, the deformation process (compression-stretching) is provided with a deforming rod which is suitable for deformation or compression-stretching and which is constructed as a protruding rod.

According to one preferred embodiment, the clamping device consisting of a piston and a cylinder in the case of a fully hydraulic injection molding machine is designed in such a way that there is a large deformation stroke.

The control of the deformation process caused by the forming machine is preferably carried out by means of electrically or electronically controlled auxiliary equipment (such as a punch card program).

According to one embodiment, the deformation speed and/or the deformation pressure is hydraulically controlled using a pressure reducing valve or another valve (for example a servo valve) capable of controlling the speed and/or pressure.

In the following, the invention will be explained in more detail with reference to the exemplary embodiments shown in the drawings.

The structure and function of the advantageous device according to the invention shown in FIG. 1 is as follows.

Structure a The fixed side consists of a support plate 22 and a slider guide plate 11 for a horizontally movable slider 13, in which the corresponding mold cavity inserts 6 and 12 are mounted. Furthermore, if necessary, a stationary side protrusion device can be incorporated. Hydraulic or pressure cylinder 15 is connected to preform insert 6
Alternatively, the slider 13 is moved so that the mold cavity 3 (for example, a gear cavity) is located at the center of the nozzle 1, if necessary. By means of the nozzle 1, the injection molded body is directly injection molded in the slider 13.

b The movable side consists of three sets of mold plates (16, 17, 18 and 19, 24, 23) or similar structures, which mold plates have a distance of, for example, 15 mm (viewed in the axial injection direction) from each other. Relative movements can be carried out on the guide rod.

The leaf spring device takes care that when the mold is opened, a predetermined maximum distance is obtained between the mold plates 18 and 19 by means of the fixing screws. Thus, when the mold is opened, two jointly controlled hydraulic cylinders arranged oppositely in the direction of ejection can introduce or remove the spacer plate 2.

In several sets of templates there is an ejector device fixedly connected by a movable pin 20 to the hydraulic ejector device of the molding machine and a core 8 movable independently thereof.

Injection molding of the functional injection molded body 4 The fixed-side slider 13 is in the "injection molded body" position (the center of the mold cavity insert 6 is in front of the nozzle 1). On the movable side, the spacer plate 2 is advanced. The mold is closed and the nozzle 1 is moved into contact with the mold cavity insert 6.
Inject the injection molded product. After the injection process, ie "injection of the injection molded body", is completed, the nozzle 1 is pulled out of the slider 13 and the mold is opened at the separating surface 25 at the same time.

At the end of the compression-stretching mold opening process, the electric contact (end switch) is released and the slider or sliders 13, buffer block 2, etc. are activated by the hydraulic cylinder. In this case, on the fixed side, the slider or slides 13 are moved into the "compression-stretching" position (mold cavity center in front of the nozzle 1), and the damping block 2 on the movable side is pulled out. Subsequently, when the mold is closed again, the cores surrounded by the injection moldings enter the mold cavity 3 (e.g. gear cavity) and are removed by the correspondingly adjusted pressure of the clamping device of the injection molding machine. The two sets of molds are compressed on the movable side, and at the same time the core mold and the deforming rod or projecting rod 5 are advanced axially in the direction of the nozzle 1 and in this case shear off the spray of the injection molded body. In this case, a force acts on the annular surface of the injection molded body, so that the injection molded body is deformed, for example into a gear. The installation of several sets of spring devices or the like prevents the opening of the separation surface 25 caused by the deformation forces acting in the axial direction of the newly formed protruding end face of the gear wheel. After the end of the compression-stretching process, the mold is opened after a correspondingly adjusted pressure holding time, and the deformation rod 5 releases the shaped body, for example a gear, from the core 8 by means of a hydraulic action of a mechanical ejection device or fixes it. On the side, the molded body is released from the mold by means of a special fixed-side ejection device. Again, the buffer block 2 and the slider or sliders 13
is sent to the starting position for "injecting the injection molding".

According to a particularly advantageous new embodiment, the mold is fixedly arranged, preferably circularly shaped, with the fixed side having a cavity insert for the injection molded body and the finished product respectively. a fixedly arranged pivot shaft, the movable side of which is rigidly connected to the mold plate and the support plate, and is pivotable about this pivot shaft;
It consists of several sets of templates, preferably of circular design, which accommodate two compression-stretching rods that are movable in a guide sleeve, with these compression-stretching rods being arranged on the fixed side. The mold plate, which is fixed to the pivot axis and is non-swivelable, is arranged in line with the correspondingly arranged mold cavity insert in the supporting plate of the mold, and when the mold is closed, these two
It has holes or cutouts for accommodating the heads of two compression-stretching rods.

Further advantages of the embodiment described above are evident from the features also recited in any one of claims 22 to 27.

This embodiment will be explained in detail below with reference to the embodiments shown in FIGS. 2 to 5.

This device has a two-part structure divided into a fixed mold member and a movable mold member by the presence of a separation plane CD. The stationary side has a preferably circular support plate or a support plate accommodating mold cavity inserts, one in each case, for the injection molded body 39 and the finished product 40 arranged symmetrically with respect to one another, which connects the cavity 45 for the nozzle. It consists of several sets of support plates 31. This support plate or sets of support plates 31 are usually fixed, but according to one embodiment:
It may be designed to be pivotable or movable upwardly and downwardly.

The movable side of the device consists of a mold plate or sets of mold plates 32, an intermediate mold plate 33 and a preferably circularly designed pivot plate 34, in which the movable mold cavity 44 and the guide sleeve 38 are located. A pivot shaft 41 that is rigidly connected to the compression and stretching rod 37 as well as to the template 35 and the movable support plate 36
is accommodated. Each compression stretch rod 3
7 may be formed separately as core part and sleeve and, if another intermediate plate is used, allows a relative movement for protruding the molded body on the movable side. A predetermined distance between templates 33 and 34 is maintained unchanged by several sets of leaf springs 43. Template plate 35 is likewise preferably of circular design.
is provided with a hole or cutout 46 for accommodating the head of one of the two compression-stretching rods 37. Several sets of springs 42 force the compression-stretch rod 37 into the starting position when the device is opened.

When the device according to the invention is in the open state, the mold plate or sets of mold plates 32 to 34 can be pivoted around the pivot rotation 41 in the swiveling plane A to B, preferably by 180°. This pivoting movement can be effected mechanically or hydraulically.

Functional type When the device is closed, the following process (with the exception of the first injection cycle) takes place: The first injection molded body is injected by the nozzle in the cavity 45, which also means that the pressure after the deformation This can be done by being delayed in time during the holding time. Simultaneously or almost simultaneously, the already injected injection moldings are introduced into the mold cavity 40 and compressed, for example by a clamping device of an all-hydraulic molding machine, and by means of a mold plate or several sets obtained therefrom. By reducing the distance between the templates 34-36 and 32-33, the compression/stretch rod 37
deformed by In this case, the spool is automatically separated. On the movable side, the movements of the molds 34-36 are not acted upon by the cutouts or holes 46 in the mold plate 35, ie no deformation takes place.

Finally, after opening the device, a pivoting movement of the molds 32 to 34 is preferably carried out by 180° on the pivot axis 41, in which case the injected injection molded body is moved, on the movable side, into the core of the compression-drawing rod 37. It remains in the area due to shrinkage. At the same time, the ejection movement occurs on the fixed side (mold cavity 4
0) or on the movable side (not shown). In this case, the finished product is released from the mold and the already injected injection molded body is fixed in a compressed or deformed position. Close the device again and start the cycle again.

By using the method according to the invention and the device according to the invention, a reduction in cycle times of about 40% can be obtained. This is because the injection of the injection molded body and the compression and stretching of the already injected injection molded body are carried out in parallel. Furthermore, in this case, for example, the pressure cylinder of a fully hydraulic injection molding machine only needs to be pressurized once, resulting in energy savings. Similarly, the generally necessary buffer blocks for compression and stretching molds and pressure switches for injection molding machines are omitted;
The device structure can be simplified.

The injection time of the preform is preferably smaller than the compression and stretching time of the injection molding. The start and end of the process of "injecting the injection molded body" depends on the respective optimum conditions.

By increasing the number of compression-stretching rods and the corresponding number of mold cavity inserts in the apparatus according to the invention, the production output can be further increased. FIGS. 4 and 5 therefore show one preferred embodiment of such an apparatus,
According to FIG. 4, two injection-molded cavity inserts 39 and two finished product cavity inserts 40 are respectively mounted on the support plate 31 on the fixed side.
They are arranged at an angle of 90.degree. and correspondingly according to FIG. 5, four compression-stretching rods are arranged at an angle of 90.degree. on the movable side.

Advantageously, the method according to the invention is advantageous if one or more new or partially new molds for compression deformation (compression stretching) and/or compression processing are used for temperature control. and/or the mold cavity in which the compression process takes place is designed to be set at a particularly low temperature. This is achieved in that on the equipment side, the mold cavity for compression deformation (compression-stretching) and the mold cavity for the production of the injection molded body are provided with separate temperature control devices.

[Brief explanation of drawings]

1 is a longitudinal sectional view schematically showing an embodiment of the device according to the invention in its closed state; FIG. 2 is a longitudinal sectional view schematically showing another embodiment of the device according to the invention in its open state; FIG. 3 is a plan view schematically showing one embodiment of the template in FIG. 2, and FIGS. 4 and 5 are
FIG. 3 is a plan view schematically showing one embodiment of a fixed side support plate and a movable side mold plate opposing thereto. DESCRIPTION OF SYMBOLS 1... Nozzle, 2... Buffer block, 3... Cavity for gears, 4... Injection molded body, 5... Deformation and ejection rod, 6... Mold cavity bush for fixed side injection molded body, 7...Mold cavity bush for injection molded body on movable side, 8...Core, 9...Ejecting device hole, 10...Ejecting plate, 1
DESCRIPTION OF SYMBOLS 1...Slider guide plate, 12...Gear mold cavity insert, 13...Slider plate, 14...
... Center ring, 15 ... Hydraulic cylinder, 16
... Template, 17... Buffer block, 18, 19...
... Template, 20... Moving pin, 21... Center ring, 22... Fixed side support plate, 23... Movable side support plate, 24... Template, 25... Division surface, 31...
Fixed side support plate, 32...template, 33...intermediate template, 34...rotary plate, 35...template, 36...movable support plate, 37...compression/stretch rod, 38...
Guide sleeve, 39... Mold cavity insert for injection molded product, 40... Mold cavity insert for finished product, 41... Swivel shaft, 42... Back pressure spring, 43... Leaf spring assembly, 44... ...Movable side mold cavity, 45...Gap for nozzle, 46...Hole or notch for head of compression and stretching rod.

Claims (1)

[Claims] 1. Injecting the plastic to be processed using an injection molding machine into a mold cavity arranged in the injection molding machine and having one or more separating surfaces, with cooling of the plastic being carried out. An injection molded body is produced which sometimes takes the form of a mold cavity, which is subjected to a compression treatment in the mold cavity during the cooling phase and is subsequently subjected to at least one compression deformation (compression) during the use of a new mold cavity. In a method for producing plastic products by subjecting the injection molded body to 50 to 50 000 KN during the cooling phase using one or more hydraulic or pneumatic cylinders in the mold cavity. , preferably to a pressure of 10 to 10,000 KN, and if a new mold cavity is used, the injection molded part is subjected to a pressure of 100 to 800 N/mm ² , in which case the clamping force and the deformation or compression-stretching force are A method for producing plastic products, characterized in that it is separately controllable. 2. A hydraulic or pneumatic cylinder is connected to a core drawing device associated with an injection molding machine, in which case the core drawing device of the injection molding machine is operated at a system pressure of 1 to 100 N/mm ² , preferably 4 to 25 N/mm ² . A method according to claim 1, operative. 3 The plastic is injected from the nozzle 1 into the mold cavity, the parting surface of the mold being clamped by a corresponding mold clamping device of the injection molding machine, and during cooling of the injection molded body or plastic product 4, the parting surface of the mold is clamped on the fixed side or on the mold cavity. By opening the separation surface 25 on the movable side, the other mold cavity is brought into the working position for the injection molding or plastic product, and by closing the mold again after withdrawing the damping block 2 or similar plate. 2. The method as claimed in claim 1, wherein the compressive deformation or compressive stretching is carried out using a correspondingly adjustable force of the device, preferably an infinitely adjustable force. 4 After compression deformation (compression stretching), the injection molded body is subjected to further compression deformation (compression stretching) in a new mold cavity, the time selected between these two compression deformations depending on the cooling behavior and the elastic properties of the plastic. 4. The method according to claim 1, wherein the method is behavior-dependently regulated. 5. According to any one of claims 1 to 4, the plastic charged into the mold cavity of the injection molding machine contains inorganic or organic fibers, fillers or reinforcing agents. Method. 6. Claim 5, in which the fibers, fillers or reinforcing agents have a completely or partially asymmetrical shape.
The method described in section. 7.0.1 to 80 inorganic or organic fibers, fillers or reinforcing agents per 100 parts by weight of plastic compound charged into the mold cavity of an injection molding machine.
parts by weight, preferably from 5 to 45 parts by weight and plastic
consisting of 99.9 to 20 parts by weight, preferably 95 to 55 parts by weight,
7. The method as claimed in claim 1, wherein processing aids are optionally used in addition. 8 The fibers contained in plastic are
8. A method according to claim 1, wherein the fiber length is between 0.001 and 10 mm, preferably between 0.05 and 5 mm. 9. Any one of claims 1 to 8 using the same mold cavity for different plastics or plastic compounds
The method described in section. 10 If one or more new mold cavities are used for compression deformation (compression stretching), the mold cavity in which the compression deformation (compression stretching) is carried out is advantageously the mold cavity for producing the injection molded body. 10. The method according to claim 1, wherein the temperature is adjusted so that the temperature is maintained at a lower temperature than in the case of . 11 The plastic to be processed has one or more separating surfaces under the use of an injection molding machine,
Injection into a mold cavity arranged in an injection molding machine, whereby upon cooling of the plastic an injection molded body is formed which takes the form of the mold cavity and which is subjected to a compression treatment in the mold cavity during the cooling phase. transfer to the fixed-side mold cavity insert for injection molded bodies in a method for producing plastic products by applying strain and then subjecting it to at least one compression deformation (compression stretching) using a new mold cavity. Injecting the injection molded body by means of a contacting nozzle, preferably a nozzle, and simultaneously or almost simultaneously injecting the already injected second injection molded body in the mold cavity insert for the finished product by means of a compression-stretching rod. Deforming under compression and separating the sprue, opening the mold and retracting the nozzle and pulling out the core from the corresponding stationary mold cavity insert for the injection molded body or for the finished product and the corresponding mold plate. Alternatively, the finished product can be ejected or released from the mold after the several mold plates have been swiveled to the mold closing side, and advantageously one of the compression and stretching rods can be moved with the mold closed after the end of the 180° swiveling movement. characterized in that the core is engaged with the contracting injection molded body into a mold cavity insert for the finished product and the free core of the other compression-stretch rod is engaged into the mold cavity insert for the injection molded body. A method for manufacturing plastic products. 12 The compression deformation of the injection molded article by the compression-stretching rod is applied to one or more of the injection molding machines after the mold is closed, while compressing several sets of leaf springs arranged between the several sets of mold plates on the closing side. 12. The method as claimed in claim 11, wherein the method is carried out using one or more hydraulic or pneumatic cylinders. 13. Claim 1, in which the leaf spring exclusively keeps the separation surface closed during the injection process of the injection molded body, the compression and stretching process and the subsequent pressure holding time.
The method described in Section 2. 14. The method according to claim 13, wherein the injection molding of one injection molded body is carried out by compression stretching within the time of deformation of another injection molded body. 15 If one or more new mold cavities are used for the compression deformation (compression stretching), the mold cavity in which the compression deformation (compression stretching) is carried out is advantageously the mold cavity for producing the injection molded body. Claim 11, wherein the temperature is adjusted so that the temperature is maintained at a lower temperature than in the case of
The method according to any one of paragraphs 1 to 14. 16 The plastic to be processed is injected using an injection molding machine into a mold cavity arranged in the injection molding machine with one or more separating surfaces, taking the shape of the mold cavity when the plastic cools. An injection molded body is produced, which is subjected to a compression treatment in a mold cavity during a cooling phase and then subjected to at least one compression deformation (compression stretching) using a new mold cavity. , an apparatus for producing plastic products consisting of an injection molding machine and a mold having one or more separating surfaces, the injection molding machine being used as a press for closing the separating surfaces of the mold during injection, and The mold clamping device, consisting of a mechanical device which is also designed as a press for deforming the injection molded body one or more times (compression stretching) and which closes the mold during injection molding, for the time being characterized in that it is used to close the separating surfaces of molds for injection of plastic products and is subsequently used separately and controllably as a press for single or multiple deformations (compression-stretching). Equipment for manufacturing plastic products. 17 The mold has one or more slides controlled by the movement of the core, which slides move the corresponding mold cavities on the fixed or movable side into their respective working positions, in this case the first In the working process, the injection molded body is injected and, by moving a slide using a hydraulic cylinder connected to the core drawing device of the injection molding machine, without or after opening the parting surface. Injection molded articles or plastic products are
17. The device as claimed in claim 16, wherein the device is introduced into the second mold cavity and deformed under the cooperation of a clamping device of an injection molding machine as a press. 18. Device according to claim 16 or 17, characterized in that the core drawing device and the hydraulic cylinder are designed as a press for deformation (compression and stretching). 19. Device according to one of claims 16 to 18, characterized in that the external hydraulic device is designed as a press for deformation (compression-stretching). 20. The device according to any one of claims 16 to 19, wherein a leaf spring, a mechanical locking device or a hydraulic device is arranged, which closes the separation surface during deformation or compression-stretching. Device. 21. Claims 16 to 20, in which a deforming rod, which is also designed as a protruding rod, is arranged for compression deformation (compression stretching).
The device according to any one of the preceding paragraphs. 22 The plastic to be processed has one or more separating surfaces under the use of an injection molding machine,
Injection into a mold cavity arranged in an injection molding machine, whereby upon cooling of the plastic an injection molded body is formed which takes the form of the mold cavity and which is subjected to a compression treatment in the mold cavity during the cooling phase. A nozzle, preferably a nozzle, which comes into moving contact with the stationary mold cavity insert for the injection molded body during application and subsequent compression deformation (compression stretching) at least once during use of a new mold cavity. to inject the injection molded body by, and simultaneously or almost simultaneously, deform the already injected second injection molded body in the mold cavity insert for the finished product under the compression action of a compression-stretching rod and sprue. , open the mold and retract the nozzle, pull out the core from the corresponding mold cavity insert for injection molded parts on the fixed side or for the finished product, and place the corresponding template or sets of templates in the mold. Injection molding in which the finished product is ejected or released from the mold after being swiveled to the closing side of the rod, and the core mold of one of the compression-drawing rods is contracted, preferably after the end of the 180° swiveling movement with the mold closed. for manufacturing plastic products by engaging the rod with the rod into a mold cavity insert for a finished product and the free core of the other compression-stretch rod into a mold cavity insert for an injection molded product. In the device, the mold consists of a fixedly arranged, preferably circularly shaped support plate or sets of support plates, the fixed side of which has a mold cavity insert each for the injection molded body and the finished product. , and the movable side is pivotable about a fixedly arranged pivot axis, which is rigidly connected to the template and to the supporting plate, from several sets of templates, preferably of circular design. The sets of templates house two movable compression-stretching rods in the guide sleeve,
In this case, these compression-stretching rods are arranged in a non-swivelable mold plate which is arranged in line with the corresponding mold cavity insert in the stationary support plate and which is rigidly connected to the pivot shaft. Apparatus for producing plastic products, characterized in that the rod has a hole or cutout for accommodating the head of one of these two compression-stretching rods when the mold is closed on the movable side. 23. The device according to claim 22, wherein the mold cavity insert for the finished product on the stationary side is provided with an ejection device for the finished molded product. 24. The apparatus according to claim 22, wherein the compression and stretching rod is formed in two parts, a core part and a bush part. 25. Device according to claim 22 or 24, in which the compression-stretching rods are maintained in their starting position by several sets of springs in the guide sleeve. 26 A structure in which several sets of leaf springs are arranged between several sets of templates on the movable side, and these several sets of leaf springs apply pressure to the separation surface when the distance between the templates is reduced. 26. Apparatus according to any one of claims 22 to 25, wherein the separation surface of the mold is kept closed by. 27. Device according to claim 26, in which several spring sets are completely or partially replaced by mechanical or hydraulic locking devices. 28 The fixed side has a large number of mold cavity inserts for injection molded bodies and finished products, and the movable side has a number of compression-stretching rods corresponding to these mold cavity inserts and is not used for compression deformation. A hole or cutout in the mold plate for accommodating the head of a compression-stretch rod, wherein the mold cavity insert and the compression-stretch rod are arranged symmetrically overlapping and opposite each other. Apparatus according to any one of paragraphs 23 to 27. 29 Claims 16 to 28, characterized in that the new mold cavity for compression deformation (compression stretching) has a separate temperature control from the mold cavity for producing injection molded bodies. The device according to any one of the above.