DE2361661A1 - PROCEDURE FOR FASTENING METAL INSERTS IN A PLASTIC RESIN CARRIER - Google Patents

Description

It 2684-

SONY CORPORATION, Tokyo, Japan

Method for fastening metal inserts in a synthetic resin carrier

The invention relates to a method for fastening metal inserts in a synthetic resin carrier and relates in particular to such a method in which the metal inserts in the Resin carrier pressed in by its softening and then attached to it by its hardening.

There are some cases where various metal inserts, e.g. metal axles, such as guide pins, pinch roller axles, etc., are to be used in, for example, a synthetic resin press frame or case of a magnetophone or the like. So far, in Fig. 1 and 2 shown method for inserting such axes used.

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The method shown in Fig. 1 will first be described. To insert axes 6 and 7 in through holes 2 and 3 of a press frame 1 in a protruding manner is a Axis guide template 15 on a surface · + of the press frame

I attached. The axes 6 and 7 are in guide bores 16 or 17 of the axis guide template 15 inserted until their ends on the upper open end parts of the through holes 2 or 3 of the press frame 1 rest. The lower surface 5 of the press frame 1 is placed on a suitable workbench, not shown placed. For example, attachments 12 attached to an ultrasonic horn 11 and 13 are against the upper ends of straight parts 10 and

II of axles 6 and 7, respectively, while corrugated parts 8 and 9 of axles 6 and 7 are pushed into through-holes "2 and 3" by applying sonic energy to axles 6 and 7 by the ultrasonic horn I ¹ +, as a result sound energy is concentrated on the corrugated parts 8 and 9, and the walls of the through holes 2 and 3 of the press frame 1 are melted to adhere to the corrugated parts 8 and 9. With such a method, the object can be achieved to some extent. However, this method has the disadvantage that the insertion of the axes 6 and 7 takes a lot of time despite the use of the axis guide template 15, that the wall surfaces of the guide s bores 16 and 17 of the axis guide template 15 are easily damaged and have a short service life Axes 6 and 7 are not always used vertically in spite of the use of the axis guide template 15 and that, since the axes 6 and 7 are not always used vertically, the axis guide template 15 is difficult to remove from the axes 6 and 7.

To avoid these disadvantages, a method shown in FIG. 2 has been proposed, which is used for inserting the axes 6 and 7 the axis guide template 15 is not used. This method should guide axle parts 18 and 19 at the ends of axles 6 or 7, insert the guide axle parts 18 and 19 into the through-holes 2 and 3 and insert the guide axle parts

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divide 18 and 19 guided roughened parts 8 and 9 into the Insert through holes 2 and 3, using the ultrasonic attachments 12 and 13 against the upper ends of the straight parts 10 or 11 must be pressed. However, this method has the disadvantage that the accuracy of the insertion of the axes 6 and 7, i.e. the Degree of perpendicularity of the axes, is low and that the guide axle parts 18 and 19 after the axles have been inserted 6 and 7 interfere.

The invention is directed to a method of attaching metal inserts directed in a resin carrier in which a non-engaging portion of each metal insert is in the manner shown in each through-hole of the synthetic resin carrier from its .Under side is used forth that it protrudes from its surface and that an engaging part of the metal insert with the marginal edge of the Through hole is brought into engagement. The engaging part of the metal insert is pressed into this through-hole with softening of the synthetic resin substrate in the vicinity of the through-hole. Any metal insert pressed into the through-hole in this way is secured therein when the resin hardens.

It is. accordingly an object of the present invention, a method for fastening metal inserts in a synthetic resin carrier to create that is free of the above-mentioned in the previous state the disadvantages experienced by technology.

It is another object of the present invention to provide a method for attaching metal inserts in a resin carrier create, with the metal inserts, such as axles, can be used on a surface of the synthetic resin support substantially perpendicular thereto. . "'

It is another object of the present invention to provide a method to secure metal inserts in a synthetic resin carrier that no "guide templates for inserting such Metal inserts, such as axes, substantially perpendicular to a surface of the 'plastic carrier requires. . ''

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It is another object of the present invention to provide a method to secure metal inserts in a synthetic resin carrier with which a variety of metal inserts, for example Axes, can be easily inserted on a surface of the resin carrier.

It is another object of the present invention to provide a method to secure metal inserts in a synthetic resin carrier, in which there are no guide links for the metal inserts must be provided.

Further objects, features and advantages of the present invention emerge from the following description of an exemplary embodiment with reference to the accompanying drawings. It shows:

1 and 2 are sections of conventional methods for pressing axles into a press frame using ultrasonic vibrations j

3 to 7 show an embodiment of the present invention for pressing metal inserts into a press frame. Fig. 3 is a front view of an axle fastener used in the invention. Fig. 4 is a Longitudinal section of Fig. 3. Fig. 5 is an oblique view of a stencil and press frame. Fig. 6 is a partially cut-away side view of the template. Figs. 7A to 7D are enlarged sections for illustration the steps of the metal inserts pressed into the frame and fastened therein.

For the present invention, for example, the Described case of fastening a plurality of axes on a press frame of a magnetophone. With reference to Referring to Figs. 3 and M- an axle mounting device used in the present invention will be described. The reference number 23 generally designates an axle mounting device,

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22 its workbench, 24 a work surface of the workbench 22, 25 a "plate-like mounting template for mounting a press frame on the work surface 24 and 29 sliding guide grooves for guiding the plate-like mounting template 25 into a position in which the shafts are fastened in the press frame 28 denotes an opening for insertion and removal of the template 25 for the above Aehsenbefestigungsvorgäng * reference numeral 32 indicates a frame or a frame of the device _s 33 of a pneumatic (or hydraulic) cylinder 34, a plunger 35 and a support frame.

At the top of the frame 32 of the device 23 is the pneumatic cylinder 33 grown vertically, while the plunger 34 extends downwards. At the lower end of the plunger 34 is over the U-shaped Support frame 35 an up and down moving head 36 attached. The reference symbols 37 denote two guide axes, which are attached to the support frame 3 5 and from the frame 32 according to protrude above. These two guide axes 3? run through two guide tubes 38 attached to the frame by the upward and downward movements of the ram 34 up and down moves, - during this vertical movement through the two Guide axles 37 and the two guide tubes 38 is guided.

A plurality of heat supply devices 100 are attached to the head 36, the number and position of which correspond to the axes, which are to be fastened in the press frame * Any heat supply device is formed from a radiator 38, a radiator tip 40 and a support tube 41. The radiator 39 is at the bottom Attached to the end of the vertical support tube 34, with the radiator tip 40 pointing downwards. The support tube 41 is on both ends of the head 36 through heat-resistant bearings 42, for example made of ceramicj held in such a way that it looks opposite the Head 36 can move in a certain area in the vertical direction. At the upper end of the support tube 41 is a flange 43 attached * The downward movement of the Stütaröhr 41 opposite

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the head 36 is by touching the flange 43 with the upper heat-resistant storage 42 limited. Furthermore, compression springs 44 are between the top of the flange 43 and the support frame 35, while each support tube 41 is always supported by the compression spring 44 is pushed down. A cover wall 46 is attached to the frame 32 and surrounds a space 45 in which the head 36 up and down is moved away. On one side of the cover wall 46 is a fan 47 for blowing cooling air into the space 45 and a guide channel 48 provided for guiding the cooling air. On the other side a drainage channel 49 is provided for upward drainage the cooling air withdrawn from the space 45. A microswitch 51 is provided at the rear or rear location of the opening 28 to indicate that the template 25 is inserted in its predetermined position below the plurality of radiator tips 40 is, namely in a layer 50 for the fastening process of Axles to complete the axle attachment process to be described later initiate. At the same point of the opening 28 is a Stop 52 is provided for positioning the template 25.

Each.Heizkörper 39 is a leading through the support tube 41 Line 5 3 electrically connected to an electrical control panel (not shown) * The heating temperature of each Heater 39 is independently controlled according to the area of each axis to be pressed into the press frame, i.e., the Product of the diameter of the part of the axle to be pressed into the frame and the amount to be pressed into the frame Part. The pneumatic cylinder 33 is operated by an air compressor, not shown.

Template 25 will now be described in detail with reference to Figures 5 and 6. Template 25 includes a base

56, a handle attached to one side of this base

57, two on the side opposite the handle 57 below guide rollers 58 mounted on the base 56, a plurality of positioning rods inserted on the top of the base 56 59 for the press frame and a variety of in a similar manner

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receiving rods 56 inserted at the top of the base 56 for the press frame. Two guide rollers 5 8 are loosely fitted into the above-mentioned sliding guide grooves 29 and guide the Template 25 along the guide grooves 2. 9. The distance between the guide rollers 58 is chosen so that it is equal to that between the guide grooves' 29 is. The plurality of positioning rods 59 for the press frame are provided for positioning of the press frame when it is placed on the template 25.

The plurality of receiving rods 60 for the press frame is provided according to the number and the position of the in the press frame axes to be pressed. These bars 60 support the underside of the press frame at points that correspond to the axis to be pressed in here correspond. Of the receiving rods 60 for the press frame, the rods that have to be pressed into the press frame, and correspond to the protruding axes, i.e. the axes which are not stored in the frame but used in it are, guide bores 61, which correspond to the diameter of the receiving rods for guiding the pressed-in axes and prevent them from falling. The bottom of the guide hole '61 is designed so that it serves as a reference surface 6 2 for the pressed-in Length is used to, the axis length pressed into the frame limit. With regard to · the stored in the press frame Axes serve the upper end surfaces of the receiving rods 60 as reference surfaces for the pressed-in length.

The press frame 65 is shown in Fig. 4 or 6 and is formed by pressing, for example (glass fiber containing) ABS synthetic resin (acrylonitrile-butadiene-styrene copolymer). Through-bores 67 are formed in the press frame 65 for receiving axles at a multiplicity of points 6 6. Furthermore, shallow grooves 67 'are formed adjacent to the through-bores 67, see FIG. '.,' ^:: -

On the other hand, each is to be pressed into the press frame 65 Metal inserts ,. d »h. Axes 71 ', with a stepped part

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see. The peripheral surface of an engaging part of each axis 71, i.e., the larger diameter portion 72 thereof is made rough, e.g., corrugated at 72a, while a disengaging one Part of the axle 71, i.e. the part 73 of which has a reduced diameter, is designed in such a way that it serves as a guide axle part, which is to be inserted into the through hole 67, see Figures 7. The diameter of each through hole 67 and each corresponding guide bore 61 are substantially equal to each other, but smaller than that of the part 72 with large Diameter of each axis 71 and substantially equal to or slightly larger than that of the portion 7 3 of reduced diameter.

The following is a description of the process for the simultaneous Fixing a plurality of axles 71 in the press frame 6, i.e. the so-called multi-axis insertion process. First the press frame 6 5 is reversely applied to the template arranged on the work surface 24, see FIG. 7A. It namely, the press frame 65 is attached with its surface 65a and its underside 65, b facing downwards or upwards. At this point in time, the press frame is automatically exactly at a predetermined position by the plurality of positioning rods 59 Position on the template 25 (see. Fig. 6), while the upper ends 60a of the receiving rods 60 the downward Face 65a of the press frame. 65 touch at the points 66 where the axes are to be pressed into the frame 6 5, and the guide bores 61 concentric with the corresponding through bores 67 can be positioned.

Next, the parts 7 3 with reduced diameter of the axles 71, correspondingly in the through holes 6 7 of the Press frame 65 is used while the axes are briefly set in the through bores 67.

After the press frame 65 and the plurality of axes 71 on the stencil 25 are set off as described above j the stencil 25 is moved on the work surface 24 and from the open

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The opening 28 is used in such a way that it is positioned in the axle fastening device 2 3 ·· at the axle press-in position 50. the Template 25 inserted into the axis press-in position 50 is' stopped by touching its one end with the stop 52, while the lateral play is stopped by touching the guide rollers 5 8 with the guide grooves 29 is prevented. Consequently, the Template. 25 positioned exactly in the axis press-in position 50. In this case the positioning of the. Template 25 will not be as accurate as the diameter of each radiator tip 40 will be noticeable is chosen larger than that of the larger diameter part 72 of each axis 71. Even if the template 25 is a little off is out of position, each radiator tip 40 can be brought into contact with each axis 71 without error. .

When inserting the template 25 into the axis press-in position 50 comes one end of the template 25 in contact with the microswitch 51 and actuates it to start the automatic axle attachment process. The time for the axle attachment operation is set by a timer, not shown.

Compressed air is automatically supplied to the pneumatic cylinder 30 for automatically depressing the plunger 34 through the the head 36 is automatically lowered. By lowering the head 36, the heating element 39 is already heated A plurality of radiator tips 40 downwardly in contact at the same time moved with the upper ends of the corresponding parts 72 of larger diameter of the axles 71, see Fig. 7B. At this point in time become the radiator tips. 40 with the axes 71 according to their different heights to different Moments brought in touch. From the moment each radiator tip 40 contacts each axis 71, that axis becomes Heat energy supplied for their automatic heating. A further downward movement of the head 36 subjects the axes 71 Pressure while simultaneously holding these axes with the radiator tips 40 heated.

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In this case, the radiator tips 40 and their support tubes 41 pressed against the head 36 upwards due to the through caused the contact of the radiator tips 4-0 with the axes 41 Reaction, whereby the respective compression springs 44 are compressed. With the downward movement of the head 36 namely press the radiator tips 40 at the same time the axes

71 against the force of the compression springs 44.

By heating each axis 71, the peripheral surface of each through hole becomes 67 of the press frame 6 5 uniformly through the part

72 melted with a larger diameter of the axis 71, while the axis 71 is pressed into the through hole 67, wherein the Part 72 with a larger diameter simultaneously performs the above-mentioned melting process. While each axis is pressurized is, namely the .Umfangsflache each through hole 67 softened and melted by the larger diameter portion 72 of the axle 71 to enlarge the through hole 67, in which the shaft 71 is pushed as shown in Fig. 7C. The scope Pool of the through hole 67 is welded to the corrugated peripheral surface 72a of the part 72 having a larger diameter. The shallow grooves 67 'are provided to prevent the heater tips 40 from coming into contact with the press frame 65.

The plurality of axles 71 are simultaneously pressed into the press frame 65 and fixed therein in the manner described above. During the above process, each through hole 67 and each guide hole 61 guide each axle 71 through its part 73 reduced diameter in such a way that no There is a possibility of unexpected inclination or displacement during the process and the axis 71 in the press frame 65 is vertical this is attached with high accuracy.

Furthermore, during the fastening process, when the axle 71 has been brought down a certain distance, the lower one comes End of the reduced diameter portion 73 of the axis 71 in contact with the reference surface 62 for the press-in length. Consequently once the part 7 3 with: reduced diameter each

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Axis 71 in contact with reference surface 62 for the press-in length came, even with further lowering of the head-36, only the compression springs 44 compressed while the radiators tip 40 cannot be lowered any further. It is therefore the depth • of each axis 71 pressed into the press frame 6.5 exactly limits a specified value. By pressing the radiator tips 40 by the compression springs 44 for simultaneously fastening the plurality of axles 71 in the press frame 6 5 and by limiting of the press-in lengths of the axes 71 by providing the reference surfaces 62 for the press-in length can namely the plurality of Axles 71 can be fastened simultaneously in the press frame 6 5 at their specified depths regardless of their lengths and stepped parts. Thus the axes 71 become rigid on the press frame 6 attached when this has hardened.

For the above reasons, it even causes wear and tear on the radiator tips 40 no unexpected change in the pressing depths of the axles 71 in the press frame 65. Namely, the axles exactly according to their specified depths regardless of wear the radiator tips are fastened in the press frame. In addition, a large number of axes can be used simultaneously in the press. stell be attached, i.e. the so-called. Multiple axis use enabled.

In the method in which each axis 71 is inserted into the press frame 6 5 by pressing the radiator tip 40 against the part 72 is pressed with a larger diameter of the axis 71 as described above, can deviate from a method in which the Radiator tip is placed on the part 7 3 with a reduced diameter of the axis 71, the distance over which the heat from the radiator tip 40 to the press frame 65 through the axis 71 is conveyed, i.e. the so-called heat transfer distance, can be made short so that the heat transfer from the radiator tip 40 to the press frame 65 can be made extremely effective. Accordingly, this method has the advantages that the .above called melting of the circumferential surface of the through hole 67 can be achieved inevitably and uniformly and that

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the above-mentioned fastening of the axle easily and inevitably can be executed.

In a method for applying ultrasonic energy to the Axes with driving tools attached to e.g. Driving tools due to their different lengths changes in the press-fit conditions of the corresponding axes for the case multi-shaft use, with the driving tools coming out unexpectedly in some cases. In the process of There is no pressing in of the axles while they are being heated with the radiator tips in the manner described above Risk of causing such malfunctions.

The temperature of each radiator tip UO during the fastening process is in the range from about 450 to 55 ° C., while the time required to fasten the axis 71 with a diameter of about 3 mm is about 2 to k seconds.

After a plurality of axes 71 has been fixed simultaneously in the press frame 65 in the manner described above, the The plunger 34 of the pneumatic cylinder 33 is automatically raised, whereby the radiator tips 40 are automatically moved up and together be returned to their original positions with the head 36.

Then the template 25 is in front! the opening 28 out onto the Work surface 24 is drawn and there is another template 25 on which the press frame 65 and the plurality of axes during of the above fastening process were placed, again arranged at the axle injection position 50 in the manner previously described.

The press frame 65 with the attached plurality of axes 71 is removed from the template 25, as in Fig. 7D again turned around and is now done. .

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During the above fastening process, the fan 47 is activated generated cooling air blown through the guide duct 48 into the space 45 for cooling the head 36 and then is out of the exhaust duct deductedi

In the above description, an embodiment of the present Invention described, however, it may be based on the technological Modifications based on the concept of the present invention can be carried out. ■

For example, the ¹ metal inserts were previously described as axles, but they can be rods, hollow axles, bolts, tubes or the like. Furthermore, each of these elements can be combined with a. Can or similar cylindrical member be covered. Furthermore, the inserts do not have to be specifically limited to those with a circular cross-section, but can also have a polygonal cross-section *

In the previous example, the press frame is used for magnetophones used as an example of the resin carrier. However, the present invention is applicable to any synthetic resin carrier applicable to the metal inserts with engagement parts are to be used, ■

Furthermore, in the previous example, the radiator tip performs both the functions of heating and suppressing of the axles. However, these two functions can also be achieved by two separate links j d * h. through a Axis heating member and an axis suppressing member.

As described above in the present invention, metal inserts are pressed into insert holding holes of a synthetic resin carrier and secured therein by applying thermal energy to the bore parts of the carrier to melt them, so that the inserts in the carrier are extremely easy , inevitably, yet within a short period of time effectively Unü can be attached with great accuracy.

Claims (10)

Pat ent s e c h e Method for fastening metal inserts in a synthetic resin carrier comprising the process steps of making one of an engaging part and a non-engaging part Part of the existing metal insert and the manufacture of a synthetic resin carrier with through holes, characterized by the following procedural steps: Insertion of the not.in engagement standing part of the metal insert in the through hole of the synthetic resin carrier from its surface, that of the one opposite, on which the metal insert is to be used, immediate softening of part of the synthetic resin substrate at the point where the engaging part of the metal insert. contacts the resin substrate, pressurizing the metal insert, and press-fitting its engaging part in the through hole of the resin carrier and hardening of the resin carrier. 2. The method according to claim 1, characterized in that a plurality of metal inserts, each of which has an engaging part and has a disengaged portion, is pressed into the resin substrate at the same time. 3. The method according to claim 1, characterized in that the non-engaging part of the metal insert is formed is so formed that it can pass through the through hole while the engaging part of the metal insert is that it cannot pass through the through hole " 4. The method according to claim Ij, characterized in that the softening of the resin substrate is achieved by conduction by contacting the engaging part of the metal insert with a heat supply device is effected during the Metal insert is pressed into the synthetic resin carrier. 409824/0896 5. The method according to claim I _9, characterized in that the synthetic resin carrier is a press frame of a magnetophone. 6. The method according to claim 1, characterized in that on a corrugation is formed in the engaging part of the metal insert is. 7. The method according to claim 1, characterized in that the Resin carrier is grooved on its other surface to prevent contact with the heat supply device herewith. · _ 8. The method according to claim 1, characterized in that a template is arranged opposite the one surface of the synthetic resin carrier for controlling the protrusion height of the metal insert, around which the metal insert ia the synthetic resin carrier is pressed. 9. The method according to claim 1, characterized in that the Metal insert is pressed into the synthetic resin carrier by pressing a heat supply device onto it Softening of the synthetic resin carrier by means of heat conduction of the metal insert and pressurizing it. ' 10. Method of fastening "metal inserts in a resin carrier with the process steps of making a of an engaging part and a disengaged one Part .existing metal inlay and the manufacture of a Resin carrier with through holes, characterized by the following procedural steps: -Insertion of the not engaged standing part of the metal insert in the through hole of the synthetic resin carrier from one surface, that of the other Opposite surface on which the metal insert is inserted, the resin carrier being held so that the former face upwards, softening a part of the resin base at the point where the engaging part of the metal insert touches the synthetic resin substrate, negative pressure 409824/0896 placing the metal insert to press in its engagement part in the resin carrier and hardening of the resin carrier. 409824/0 8 Empty soap