JPH0324312Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention involves molding brake pads used especially for braking automobile wheels, and inverting the molded brake pads so as not to damage them during the subsequent process. This relates to a device placed on a machine.

[Conventional technology]

Brake pads are mainly used in automobiles, and are made by integrally bonding a backing member made of insulating fiber material to the back of a brake pad body made of semi-metallic material, and integrally providing a boss protruding toward the rear on the back of this backing member. Used in disc brakes. The boss on the back of the backing member of this type of brake pad is formed of the same insulating fiber material as the backing member, and a back metal having holes is attached to the back of the backing member using the boss.

Conventionally, when molding such brake pads, a mold is first filled with semi-metallic material powder, and then insulating fiber material powder is filled in a layer above and below the semi-metallic material. , they are pressed from above so that an integral boss is formed on top of the layer of insulating fabric, and this operation is all done manually. After this preforming, the brake pads are fitted between hot platens and press-formed at, for example, 200°C and a pressure of 250 tons to form the final product.

[Problem that the invention attempts to solve]

In the conventional brake pad preforming method described above, press molding is performed with the boss protruding from the back facing upward, so the boss is formed with a downward opening on the lower surface of the press ram, etc. that descends during the press molding stage. However, with this configuration, no matter how much pressure is applied to the press ram, it is not possible to sufficiently push the insulating fiber material powder into the boss-forming recess, and the formed boss The density is insufficient and the strength is low. Since the boss has the role of supporting the back metal behind the bucking member, low strength of the boss is fatal to the brake pad.

The present invention aims to solve the above-mentioned problems of the prior art.

[Means for solving problems]

To achieve this purpose, the device according to the present invention includes an outer mold with an open upper part, a lower mold device that constitutes the bottom of the outer mold, and a part of the lower mold device that allows the device to enter the outer mold from below. a medium mold that is inserted and has an upward concave hole for molding the boss; a press molding ram that descends from above into the outer mold after supplying raw materials into the outer mold and compresses and molds the material inside the outer mold; A device that opens the outer mold at the lower mold device by moving the lower mold device after press forming, a receiving tray supported movably to a position below the outer mold, and a receiving tray located below the outer mold. A device that pushes the molded brake pads downward from inside the outer mold with the boss facing downward and places them on the tray, and a device that advances the brake pads to a position above the brake pads after placing the brake pads on the receiving tray. The cover plate that holds the upper side of the receiving tray, and the receiving tray and cover plate that hold the brake pads on the lower and upper sides thereof, are both turned upside down and moved so that the cover plate supports the brake pads from below. The brake pad is provided with a reversing device and a receiving part which is provided at a position below the cover plate which has finished moving while being reversed, and receives the brake pad released by retreating the cover plate with its protrusion facing upward.

With such a configuration, in the present invention, the forming material can be filled from above into the concave hole of the lower mold that opens upward, thereby increasing the density and strength of the boss portion and making it uniform. In addition, in this invention,
After molding, the downward boss of the brake pad taken out of the mold is turned upside down and placed on the brake pad receiving tray for transportation for subsequent processing. Damage to the boss can be prevented during the process.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an example of a brake pad manufactured by the apparatus of the present invention. In the figure, SM is the brake pad body made of semi-metallic material, which is pressed against the surface of the brake disc during braking. Semi-metallic material is a granular material of non-rusting metal material.
For example, it is made of finely cut stainless steel wire. Brake pad body
Behind the SM is a backing member made of insulating fiber material.
The BM is integrally joined, and a plurality of bosses BS are protruded from the back surface thereof, and the back metal P is supported on the back surface of the backing member BM using the bosses BS. The insulating fiber material is, for example, a mixture of asbestos, cashew dust, metal powder, and others, and is in powder form before being molded.

FIG. 1 shows the entire apparatus of the present invention, and a brake pad excluding the back metal P is preformed by this apparatus. This device includes a press and mold opening station Z, a filling/temporary pressing station A, a receiving tray retreating station B,
It has a receiving tray reversing station C.

This device has a bed 2 on station Z, and on this bed 2 there is a bed in the longitudinal direction of the device (first
A horizontal support plate 3 is fixed in the left-right direction in the figure, and a longitudinal guide 4 is provided thereon. As shown in FIG. 3 when viewed in the - line direction of FIG. 1, a pair of guides 4 are provided along both longitudinal edges of the horizontal support plate 3. As shown in FIG. A sliding member 5 is provided between the pair of guides 4 so as to be slidable in the longitudinal direction (direction perpendicular to the paper plane of FIG. 3). A lower mold device 7, which constitutes the bottom of the brake pad mold, is held on the sliding member 5 by a holding member 6.

The lower mold device 7 has a lower platen 8 and an upper platen 9 as shown in FIG.
is the guide column 1 established on the lower platen 8.
It is possible to move up and down while being guided by 0,
A spring 11 is provided to resist the lowering of the upper platen 9. A middle mold 12 forming a part of the lower mold device 7 is integrally provided on the upper platen 9, and a recessed hole 13 is provided at the top of the middle mold 12. This recessed hole 13 opens upward and serves to form the boss BS of the brake pad as described below.

In FIGS. 1 and 3, reference numeral 15 denotes an outer mold for molding brake pads, which has molding cavities 15a that open upward. In the illustrated example, two cavities 15a are provided, the same as the number of middle molds 12. The bottom of each cavity 15a is normally closed by fitting the middle mold 12 into the cavity from below. Therefore, a boss forming concave hole 13 that opens upward is provided at the bottom of each cavity. The outer mold 15 is movable between a position at station A, as shown by the phantom line in FIG. 1, and a position at station Z, as shown by the solid line, by a support and conveyance mechanism (not shown). Further, the outer mold 15 can also be moved upward at the station Z as described later.

A push-up rod 16 is provided in the station Z so as to vertically move through the pair of guides 4. The lower ends of these push-up rods 16 are connected to a vertical drive mechanism (not shown), and the push-up rods 16 move upward due to the operation of the vertical drive mechanism, and push the outer mold 15 through the overhanging portion 17 of the outer mold 15. Push upward as described below.

The station Z is also provided with plate bodies 18 arranged in a tree shape on the outside of the guide 4, and a stopper 19 bent inward is provided at the upper end of each plate body 18.

In the station Z, a press ram 21 is mounted above a predetermined position of the outer mold 15 in a cavity 15a of the outer mold.
are provided corresponding to each. Ram 21
has a compression surface 21a at the lower end, and is lowered and inserted into the corresponding cavity 15a during molding,
The molded product is pressed between the medium die 12.

A quantitative supply chute 23 is provided so as to be movable between a position directly above the outer mold 15 at station A and a position remote therefrom. As shown in FIG. 5A, the chute 23 is connected to the outer mold cavity 15.
It is provided with chute portions 23a corresponding to each of a. Each chute portion 23a of the chute 23
An opening/closing plate 24 is provided to be able to slide in the horizontal direction, and for sliding displacement of the opening/closing plate 24, the opening/closing plate 24 is fixed to the tip of the piston rod of the air cylinder 25. When the piston rod is extended, the opening/closing plate 24 closes the bottom of the chute portion 23a, and when the piston rod is retracted, the bottom of the chute portion 23a is opened. As shown in FIG.
is adapted to be moved onto the outer mold 15 with a certain amount of material filled inside.

As shown in FIG. 1, an air cylinder 28 is fixedly provided to the bed 2 in the region of a receiving tray retraction station B provided subsequent to the press/mold opening station Z. The tip of the piston rod 29 of the air cylinder 28 is connected to the right end of the sliding member 5 in the drawing. Further, a rising end plate 31 is fixed near the right end of the sliding member 5 in the figure, and a horizontal support plate 32 is fixed to this end plate 31. Therefore, support plate 3
2 moves together with the sliding member 5.

As shown in FIGS. 6 and 7, a bearing 33 is fixed near the right end of the support plate 32 in the drawings, a pivot 34 is rotatably inserted through this, and a pinion 35 is attached to the end of the pivot 34. A vertical rack 36 is engaged with the pinion 35. The rack 36 is guided by a guide 37, and the lower end of the rack 36 is fixed to the upper end of the piston rod of an air cylinder 38 in the vertical direction. Therefore, by expanding and contracting the air cylinder 38, the pivot 34
rotates.

The pivot 34 has a rising portion 40 at one end of the reversing plate 40.
a is fixed, and the reversing plate 40 can be rotated from the solid line position to the imaginary line position in FIG. 6 by rotation of the pivot shaft 34, and can be reversed up and down. One end of an air cylinder 42 is fixed to a bracket 41 fixed to one end of the reversing plate 40, and the other end of the air cylinder 42 is also connected to the reversing plate 4 by another bracket 43.
Fixed above 0. A cover plate 46 is fixed to the tip of the piston rod 44 of the air cylinder 42 via a mounting plate 45.

On the other hand, a molded brake pad receiving tray 49 is fixed on the reversing plate 40. The receiving tray 49 has a receiving surface 50 and has an open top surface,
Moreover, as shown in FIG. 7, two are provided side by side. When the air cylinder 42 is extended from the state shown in FIGS. 6 and 7, the cover plate 46 moves forward and
The upper surface of the two receiving trays 49 is covered.

Next, the operation of the device described above will be explained.

When starting the operation of the device of the present invention, first the piston rod 29 of the cylinder 28 in FIG.
is made to protrude, and the sliding member 5 connected thereto moves along the guide 4 to the left in the figure. As a result,
The lower mold device 7 on the sliding member 5 comes to be located at the station A as shown by the phantom line in FIG.
The outer mold 15 is positioned on the lower mold device 7 so that the middle mold 12 is fitted into the bottom of the cavity 15a as shown in FIG. 5A. Next, the outer mold 15
A metering supply chute 23 to which a predetermined amount of heat insulating fiber material BM is supplied is positioned above as shown in FIG. 5A. As mentioned above, the insulation fiber material BM is made of asbestos, cashew dust, metal powder,
It is in powder form with other mixtures.

When the piston rod of the cylinder 25 is moved back in this state, the opening/closing plate 24 moves back and the chute 23
The bottom of the mold opens and a certain amount of insulation fiber material BM is inserted into the outer mold 15.
is supplied into each cavity 15a. At this time,
A medium-sized concave hole 13 forming the bottom of the cavity
Insulating fiber material BM is also inserted inside, and the same fiber material (hereinafter referred to as
(referred to as raw material) has the shape shown in FIG. 5B.

Next, the quantitative supply chute 23 is withdrawn from the position above the outer mold, and the head 55 having the boss thrust rod 54 is moved above the outer mold as shown in FIG. It is lowered so that it enters each. As a result, the raw material BM is particularly compacted within the concave hole 13,
The shape is as shown in FIG. 8B. This results in
The tip of the boss BS formed in the recessed hole becomes particularly dense.

The boss thrusting rod 54 then rises and retreats from above the outer mold 15, and then, as shown in FIG. 9A,
A head 57 with a leveling device 56 for the upper surface of the raw material BM descends. The leveling device 56 is composed of a large number of leveling needles 60 suspended from a support plate 61. As shown in FIG. 10, the support plate 61 is composed of a lower plate 62, an upper plate 63, and an elastic plate 64 such as a rubber plate sandwiched between them, and the lower plate 62 is shown in FIG. It has leveling needle insertion holes 65 and tightening bolt insertion holes 66 which are randomly arranged. Insert the leveling needle 60 from above to the bottom through any number of holes 65 in the lower plate 62, bring the lower surface of the leveling needle's head 60a into contact with the upper surface of the lower plate 62, and then let the leveling needle escape downward. prevent,
Next, sandwich the elastic plate 64 and place the lower plate 62 on the lower side of the upper plate 63, so that the tightening bolt insertion hole 66 and the upper plate 63 are aligned.
The leveling needle 60 is installed in the state shown in FIG. 10 by inserting a bolt into a similar hole (not shown) provided in the housing and tightening both the upper and lower plates.

The head 57 of the leveling device 56 is provided with a vibrating device (not shown), and by operating the vibrating device with the lower end of the leveling needle 60 of the leveling device 56 in contact with the upper surface of the raw material BM. Then,
The top surface of the raw material BM is leveled by the tip of the leveling needle 60 as shown in FIG. 9B, and segregation of the raw material is eliminated. Moreover, the thickness of the raw material becomes uniform.

Note that the arrangement of the leveling needles 60 and the number of used leveling needles can be freely changed by removing the lower plate 62, and damaged leveling needles can be replaced immediately.

Next, after raising and retracting the leveling device 56, the press head 68 for temporary pressing is moved as shown in FIG. 12A.
is lowered, and the smoothed raw material BM is temporarily pressed from the upper surface. As a result, the raw material BM is solidified as shown in FIG. 12B. At this time, press head 6
If a protrusion 68a corresponding to the recessed hole 13 is provided on the lower surface of the recessed hole 13, the raw material inside the recessed hole 13 and the vicinity thereof can be compacted more densely.

After the compaction of the heat insulating fiber material BM is completed in this way, the press head 68 for temporary pressing is raised and retracted, and then the same quantity supply chute 23 as shown in FIG. 5A moves above the outer mold 15. . However, the semi-metallic material SM is supplied in a fixed quantity into the fixed quantity supply chute 23 instead of the previously described heat insulating fiber material BM. As mentioned above, the semimetallic material SM is a powdery material of a non-corrosive metal material.

When the opening/closing plate 24 retreats, the semi-metallic material
The SM falls from inside the chute 23 into the outer mold 15 and covers the insulation fiber material BM as shown in FIG. 13B.

Next, the quantitative supply chute 23 is evacuated, and the ninth
The same leveling device 56 as explained in Figure A is lowered into the outer mold as shown in Figure 14A, and the upper surface of the semimetallic material SM is leveled by vibration, eliminating segregation and making the thickness uniform. . The situation thus obtained is shown in Figure 14B.

All the steps described above are performed at station A. After completing the above steps, the first
As the piston of the cylinder 28 shown in the figure retreats, the sliding member 5 is displaced to the right in the figure, and the lower die device 7 on the sliding member 5 moves from the imaginary line position to the solid line position and moves to the station Z. Move. At the same time,
The outer mold 15 is also moved to station Z. Thus, the state shown in FIG. 15 is obtained.

In this state, the above-mentioned press ram 21 is
5, the heat insulating fiber material BM and the semi-metallic material SM are pressed together with the lower mold device 7 and molded. At this time, as shown in FIG.
The upper platen 9 lowers slightly while compressing the spring 11.

As described above, the brake pad is preformed within the outer mold 15. To remove the brake pad from the outer mold, the push-up rod 16 is pushed upward by a drive device (not shown) in the state shown in FIG. As a result, the upper end of the push-up rod 16 lifts the outer mold through the overhanging portion 17 of the outer mold, and finally the overhanging portion 17 is brought into contact with the stopper 19 of the upper bent portion of the plate body 18, as shown in FIG. bring it into contact. By this,
The outer mold 15 stops rising, and the middle mold 12 of the lower mold device 7
is exposed. At this time, the molded brake pad is still in the outer mold 15.

Next, the sliding member 5 moves forward as the piston of the cylinder 28 shown in FIG. Thus, a space is left between the plates 18.

The receiving tray 49 is sent into this empty space as shown in FIG. This is cylinder 28
This is done by the advancement of the piston. That is,
As the piston moves forward, the support plate 32 fixed to the sliding member 5 also moves forward, and the receiving tray 49 on the support plate 32 also moves forward and moves below the outer mold 15.

In the state shown in Fig. 18, the press ram 2
1 goes down. As a result, the brake pad is pushed downward inside the cavity 15a, and
It is placed on a receiving tray 49 as shown in the figure.
At this time, the brake pad is supported by the receiving tray 49 with its boss B facing downward.

The support plate 32 supporting the receiving tray 49 is then retracted by the retraction of the piston of the cylinder 28 to the first position.
Return to the position shown in the figure. Next, the cover plate 46 is moved forward by the piston of the cylinder 42 shown in FIG.
covers the upper surface of the receiving tray 49, then the rack 36 rises due to the rise of the piston of the cylinder 38, and the rotation of the pinion 35 causes the reversing plate 40 to be reversed to the imaginary line position in FIG. 6 via the pivot 34. By retreating the cover plate 46 of the receiving tray 49, the brake pad is placed in the sixth position with the boss BS facing upward.
It is placed on a receiving portion 70 shown in the figure. Receiving part 70
is, for example, a conveyor.

In this way, the pre-formed brake pads are placed with the easily damaged boss facing upwards, and are conveyed on a conveyor, where they are press-formed while being heated between heating plates to become the final product. .

(Effects) As described above, in this invention, the concave hole for forming the boss of the brake pad is provided upward in the lower mold at the bottom of the outer mold, and as a result of supplying the raw material into the outer mold and press forming, the boss part is formed. Density and strength can be increased, making molding work easier. After molding, by turning the molded product upside down so that the boss faces upward, the brake pad can be sent to the final pressing process without damaging the boss.

[Brief explanation of the drawing]

Figure 1 is an overall view of the brake pad molding reversal device of the present invention, Figure 2 is a sectional view of the brake pad,
Figure 3 is a sectional view taken along the - line in Figure 1, Figure 4 is a front view of the lower mold device, Figure 5A is a diagram showing the state of supply of the insulating fiber material into the outer mold, and Figure 5B is the outer mold. FIG. 6 is a side view showing the reversing mechanism of the receiving tray for preformed brake pads, FIG. 7 is a plan view of the same, and FIG.
The figure shows the tamping process using a boss tamping rod, Figure 8B shows the shape of the insulating fiber material given by the same process, Figure 9A shows the breaking-in process, and Figure 9B shows the insulation by the same process. FIG. 10 is a longitudinal cross-sectional view showing the shape needle takeout part of the leveling device;
FIG. 12A is a plan view of the lower plate shown in the figure, FIG. 12A is a diagram showing the temporary pressing process, FIG. 12B is a diagram showing the shape of the heat insulating fiber material obtained in the same process, and FIG. 13A is a diagram showing the semimetallic material supply process. Figure 13B is a diagram showing the shape of the raw material obtained in the same process, Figure 14A is a diagram showing the leveling process of semimetallic material, Figure 14B is a diagram showing the shape of the raw material obtained in the same process, Figure 14B is a diagram showing the shape of the raw material obtained in the same process, Figure 15 is a diagram showing the state before the start of the press forming process, Figure 16 is a diagram showing the press forming process, and Figure 17 is a diagram showing the state before the start of the press forming process.
The figure shows the process of opening the outer mold, FIG. 18 shows the brake pad just before being taken out after preforming, and FIG. 19 shows the brake pad in the completed state. BS...Boss, SM...Semi-metallic material (brake pad), BM...Insulating fiber material (backing member), Z...Press/mold opening station, A...Filling/temporary pressing station, B... Receiving tray reversing station, C... Receiving tray reversing station, 2... Bed, 4... Guide,
5...Sliding member, 7...Lower die device, 12...Medium die forming part of the lower die, 13...Recessed hole, 15...Outer die, 16...Uplifting rod, 19...Stopper, 21
...Press ram, 23...Quantitative supply chute,
23a...Chute part, 24...Opening/closing plate, 25
...Air cylinder, 28 ...Air cylinder, 32
... Support plate, 34 ... Axis, 35 ... Pinion, 3
6...Rack, 38...Air cylinder, 40...
Reversing plate, 42... Air cylinder, 46... Cover plate, 49... Receiving tray, 54... Boss pushing rod, 56... Leveling device, 60... Leveling needle, 68... Press head for temporary pressing, 70... Receiving part.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A brake pad molding reversal device having a boss protruding from the rear surface, which comprises an outer mold for molding with an open upper part, a lower mold device forming the bottom of the outer mold, and a lower mold. A middle mold that is inserted from below into the outer mold as part of the device and has an upward concave hole for forming the boss; A press molding ram for compression molding the inner material, a device for opening the outer mold at the lower mold device by moving the lower mold device after press molding, and a receiving tray movably supported at a position below the outer mold. , a device for pushing the molded brake pad downward from inside the outer mold with its boss facing downward and placing it on a receiving tray located below the outer mold; and after placing the brake pad on the receiving tray. The cover plate advances to the position above the brake pads and holds the brake pads on the upper side of the receiving tray, and the receiving tray and cover plate, which hold the brake pads on the lower and upper sides respectively, are moved upside down and covered. A reversing device allows the plate to support the brake pad from below, and a reversing device is provided below the cover plate that has finished moving while reversing, and the brake pad is released when the cover plate retreats, with its protrusion facing upward. A molding reversing device for brake parts, which is equipped with a receiving part for receiving brake parts in the same condition. 2. A request for registration of a utility model in which the reversing device consists of a reversing plate that can reciprocate about a horizontal axis and supports a receiving tray and a cover plate, and a drive device that reciprocates this reversing plate over 180 degrees. A brake pad mold reversal device according to scope 1.