JPH06328478A - Method for molding and discriminating disk brake pad simultaneously - Google Patents

Abstract

PURPOSE:To improve the control of manufacturing history and curtail process by discriminating and displaying a disk brake pad simultaneously with molding. CONSTITUTION:Markings 6a and 6b are embedded in a forming mold so as to mold a pad, which is simultaneously discriminated and displayed at a back plate 5 and a mold hole 7. The discrimination for particularly the mold hole 7 is performed through a mold releasing film or transfer may be performed by using a mold releasing film which is previously printed for discrimination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for simultaneously identifying a disc brake pad used for a brake of automobiles, railroads, industrial machines, etc. at the same time as molding.

[0002]

2. Description of the Related Art Conventionally, a disc brake pad has a back plate, which is a metal portion before molding, having a product number, a product name, etc., stamped in advance and combined with a powder or a temporarily molded material at the time of compression molding to be integrated. The shape is completed by. The integrated disc brake pads are collectively transported to the subsequent process, and the manufacturing history is displayed as a lot number using a marking machine or a stamp.

That is, the finished product of the disc brake pad has the product name of the material used for the friction portion and the lot number indicating the manufacturing history. In the conventional technology, the above-mentioned identification is performed simultaneously with the molding in the compression molding process. Was never given.

Further, the lot number indicating the manufacturing history is a mechanism for determining the manufacturing date and the equipment used in the compression molding process, which is the process that most affects performance during the manufacturing process. In order to show in detail, it is advisable to add a symbol indicating the use site (cavity) of the molding die of the equipment used or the multi-cavity die, a symbol indicating the number of the item manufactured on that day, and the like.

However, in the conventional technique, since the back plate in which the product name of the material is engraved is used before the friction material and the back plate by compression molding are integrated, different types of back plates having the same shape are formed. If so, clear management is required as a different product. Furthermore, in order to stamp or display the lot number after compression molding, the cargo is once collected and a management slip is attached. It is necessary to collate with the management form when stamping or stamping. Further, it is difficult to give a symbol indicating a used part (cavity) in a molding die showing a detailed manufacturing history or a multi-cavity die, and a symbol indicating which item is manufactured on the day. .

[0006]

By discriminating the disc brake pads at the same time during compression molding, the above-mentioned management of the material of the back plate by material name, and attachment of a management sheet after molding and omission of stamping or stamping work. This makes it possible to add an identification indicating a more detailed manufacturing history.

[0007]

DISCLOSURE OF THE INVENTION The present invention is a method for simultaneously performing molding and identification in a compression molding process of a disc brake pad, using a pressure mold or a pressure jig having a stamp embedded in advance. . That is, the back plate 5 or the mold hole 7 is utilized by utilizing the force of compressing and molding the powder or the temporarily molded material on the back plate.
The identification processing is performed on the.

The pressing force used here is set based on the performance and area of the material to be molded. Therefore, the force applied to the marking will change depending on the type of material to be molded, so it is preferable to select a marking with a sharp tip and to make the marking height as uniform as possible. . The stamps selected in this way are embedded in the mold and stamped at the same time as compression molding. The number of stamps to be arranged is the value obtained by dividing the pressure applied to one disc brake pad by the number of stamps and the pressure applied to each stamp. As a guide, 30
Select the number of markings so that the strength is 0 kg / mark or more. It is preferably 400 kg / mark or more.

However, the information necessary for identifying the disc brake pad needs at least the material name and the date of manufacture, and since the above-mentioned pressing force is consumed only by this information, more detailed information is required. It is recommended to use a mold hole that has fluidity at the time of molding in order to engrave the symbol related to the used equipment.

The mold hole is made of a friction material or a hole filling material having a large resin compounding ratio, and during compression molding, the resin flows and hardens due to heating and pressurization, so that a large pressing force is not required. A few kg / engraved to several tens of kg / engraved are sufficient.

However, when the molded product is removed from the mold due to the brittleness of the material itself and the softness of the resin when heated, the marking portion may stick and the resin may remain on the marking side. Therefore, it is advisable to apply a release agent to mark the mold holes. More preferably, it is carried out through a release film or release sheet. Alternatively, a film that retains strength at high temperature may be engraved in advance, and the film may be attached to a mold corresponding to the mold hole and transferred to the mold hole to substitute the engraving.

[0012]

In the method for simultaneously forming and identifying the brake disc pad according to the present invention, the back plate 5 as the material to be stamped is mild steel conventionally used, and the mold hole 7 portion is made of friction material or hole filling material. Therefore, the material of the marking is the same as the conventionally used material, and there is no inconvenience.

The print shape of the marking is as described above.
It is preferable that the printed or symbol portion is sharpened, and when embedded in the mold, the heights of the convex portions of the markings with respect to the mold surface should be made uniform.

If the height A of the convex portion of the marking with respect to the mold surface is small, the marking becomes unclear, and if it is large, a bending moment acts with the marking on the back plate as the fulcrum, and the warpage of the plate adversely affects the performance of the friction material. Bring Preferably, the height A of the convex portion is 0.1 mm to 0.3 mm.

Next, as to the identification of the mold hole, the friction material or the hole filling material as the material to be engraved contains a thermosetting resin typified by a phenol resin and flows at the time of heating / pressurizing. The engraving does not require a large pressing force, and the height of the convex portion is about 0.05 mm to 0.15 mm.

Further, as described above, the marking portion embedded in the mold and the filling material or the friction material may adhere to each other, and a part of the resin may remain in the marking. Therefore, the paraffin dispersion releasing agent is applied beforehand. And good. More preferably, the marking may be covered with a releasable sheet or film, and the material of the sheet or film exhibits releasability to a resin serving as a binder of a friction material typified by a phenolic resin, and at a heating temperature. Any material that does not melt can be used, but tetrafluoroethylene resin is preferred.

Further, as a method of marking the mold hole portion 7, a polyester-based hard sheet is used, and if this is stamped in advance, an uneven identification mark can be formed. This sheet can be cut out, loaded into a mold corresponding to the mold hole 7, and transferred by pressurization, so that the marking can be substituted.

[0018]

【Example】

(Example 1) Five marks 3.2 x 2.5 mm in size were fitted in a position corresponding to the back plate position of the disk pad molding die, and the height A of the convex portion was adjusted to 0.18 mm. Using this mold, a disc pad having a friction area of 44 cm ² was heated to 150 ° C. using a thermoforming machine, and the surface pressure was set to 100.
A disk pad was manufactured by pressure molding for 7 minutes at kg / cm ² . The engraving depth was 0.07 mm, and it was legible even after rust-preventive coating. The warp of the product was 0.05 mm, which was within the specifications for use.

Table 1 shows the results obtained by using the stamps of the same size and changing the height A of the convex portion and the molding conditions. In the table, the results of the heights of the convex portions of the markings being less than 0.1 mm and exceeding 0.3 mm are comparative examples.

[0020]

[Table 1]

(Embodiment 2) One inscription of 3.2 × 2.5 mm size was fitted in the portion corresponding to the mold hole of the mold used in Embodiment 1, and tetrafluoroethylene resin The disc pad was molded under the same conditions as in Example 1 by using the above-mentioned 0.1 mm sheet. In addition, the hole filling material mounted on the back plate was previously embedded in the mold hole. The height of the convex portion of the marking of the mold hole was adjusted to 0.1 mm including the sheet. The back plate portion of the molded disc pad had a marking depth of 0.07 mm, and the marking of the mold hole portion was also readable after rust-preventive coating.

Example 3 A 0.2 mm polyester film was preliminarily stamped on a hard rubber sheet to make it uneven. Cut this out to the size of the mold hole,
The pedestal was put in the mold hole portion of the mold used in Example 2 and loaded. The pedestal was provided with recesses corresponding to the thickness of the polyester film. As a result of making a disk pad under the same conditions as in Example 1, a sufficiently readable identification mark was transferred to the mold hole.

[0023]

According to the present invention, since the disc pad is manufactured and the identification is given at the same time as the molding, it is possible to omit the work of marking or stamping in another process and the lot control between the processes, and as an important safety component. The manufacturing history of is managed accurately.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view at the time of molding in the present invention.

FIG. 2 is an external view of a disk pad after molding in the present invention.

FIG. 3 is a schematic cross-sectional view for identifying a mold hole portion of the present invention.

FIG. 4 is an explanatory diagram of a convex height A of a stamp according to the present invention.

[Explanation of symbols]

 1: Die (Punch) 2: Die (die) 3: Die (stand) 4: Friction material part of pad 5: Back plate 6a, 6b: Engraved 7: Mold hole 8: Releasable sheet

Claims (4)

[Claims] 1. A disc brake pad is formed and identified in a compression molding process of a disc brake pad by using a pressure die or a pressure jig having a marking embedded in advance on one surface of a back plate of the pad. How to do at the same time. 2. The method for simultaneously performing molding and identification of a disc brake pad according to claim 1, wherein the height of the convex portion of the marking embedded in the die is 0.1 mm or more and 0.3 mm or less from the die surface. 3. Molding and identification of the disc brake pad according to claim 1, wherein a release agent, a release film or a release sheet covers the convex portion of the marking to indirectly give identification to the mold hole portion. How to do it at the same time. 4. The molding of a disc brake pad according to claim 1, wherein a mold-releasing sheet having irregularities for identification is loaded on a surface of the mold opposite to the mold hole, and the identification is transferred to the mold hole. And identification at the same time.