JPS62151243A - Production of disk brake caliber body - Google Patents

Abstract

PURPOSE:To decrease the machining allowance of a cylinder regardless of the inside size of a claw and to improve the productivity of a product by disposing a cylinder part molding die to a rotor width part molding die and housing the former into the cavity part of the latter after casting, then taking out the product. CONSTITUTION:The cylinder part molding die c' having a core handle (g) corresponding to the inside size (d) of the claw is disposed to the rotor width part molding die b' of a disk brake caliber body (a) and the titled product (a) is cast. The core handle (g) is pulled after casting and is housed into the cavity part (f) of the rotor width part molding die, then the product (a) is taken out. The machining allowance of the cylinder part is decreased to the adequate allowance regardless of the inside size (d) of the claw, by which the finish machining is made more efficient and the productivity of the product is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for manufacturing a disc brake caliper body, in which a rotor width portion and a cylinder portion of the caliper body are simultaneously molded using a mold when the caliper body is cast using a mold. It is related to.

[Problems to be solved by the prior art and the invention] When the caliper body is made of cast iron, the caliper body (
Although a) is produced by a sand casting method, the rotor width part (b) and the cylinder part (C) are molded with a sand core.

However, when the caliper body is made of a light alloy such as an aluminum alloy, a mold is often used. However, the above rotor width part (b) and cylinder part (C)
When molding with a mold, the cylinder inner diameter dimension (e) is determined by the pawl inner dimension (d) as shown in FIG. 2, and the cylinder inner diameter dimension (e) inevitably becomes smaller. As the inner diameter of the cylinder (e) becomes smaller in this way, the wall thickness of the cylinder becomes thicker, which makes internal defects more likely to occur, resulting in a decrease in quality and the need for more processing, which only shortens the life of the processing cutter. However, it has the disadvantage that it requires time and effort for processing and has a poor material yield.

In order to avoid this problem, it is conceivable to increase the pawl internal dimension (d), but there is a restriction that this pawl internal dimension (d) cannot be made too large from the viewpoint of caliper rigidity and the like.

The present invention has been made to solve these problems and restrictions.

(Means for Solving the Problems) Based on the above, the present inventors have conducted extensive studies on a method for increasing the cylinder inner diameter dimension (e) without being influenced by the pawl inner dimension (d), and have developed the present invention. The present invention provides a method for simultaneously molding a rotor width portion and a cylinder portion using a mold when a caliper body is cast using a mold. A cave part is provided in the area opposite to the mold into which the mold for molding the cylinder part can move in and out, and when casting the caliper body, the mold for molding the rotor width part is placed in the rotor width part, and the mold for molding the cylinder part is placed in the cylinder part. The disk is characterized in that when position V is closed and mold casting is performed, and when the cast caliper body is taken out from the mold, the cylinder part molding mold is housed in the cave part of the rotor width part molding mold and the mold is handled. This article summarizes the method for manufacturing brake caliper bodies.

〔Example〕

The details of the method of the present invention will be explained using FIG.

The outer shape of the caliper body (a) is molded using a mold (not shown) according to a conventional method, and a rotor width molding mold (BO) for molding the rotor width and a cylinder part are molded. The rotor width portion and the cylinder portion are also molded at the same time using a mold for molding the cylinder portion (Co).

Therefore, the mold for molding the rotor width portion (bo) is provided with a cave portion (f) that can accommodate the mold for molding the cylinder portion (Co); When the molds (Co) are in positions for molding the rotor width portion and the cylinder portion, respectively, the molds (Co) are set at opposing positions where they can move in and out in the direction of the arrow.

1) is a moving core of the mold (Co), which also serves as the mold for forming the inner dimension (d) of the caliper body pawl, and the mold (b)
It is inserted into the cave part (f) through a hole drilled in the bottom of the cave part (f) on the opposite side from the opening of o), and its tip is screwed into the mold (Co) and removably attached by other methods. It is being

Therefore, as shown in the figure, the caliper body is cast by placing molds (bo) and (Co) at the molding parts of the rotor width part and the cylinder part, respectively.
The bottom edge of o) is joined to the opening edge of the cave part (f), and the core (g) is connected to the bottom surface of the mold (Co) and passes through the cave part (f) to form the caliper body. It extends to the inside of the pawl, and the rotor width portion and cylinder portion thereof are also molded at the same time as the caliper body (a) is molded.

Next, after molding and solidifying the caliper body (a), when taking it out from the mold, if the core (0) is moved to the left of the arrow, the mold (Co) also moves to the left of the arrow, and the cave part (bo) of the mold (bo) is moved. f), and the core (g) and mold (
After removing the connection of Co), shape of mold (b') (C') (
Obtain disc play caliper body products by making friends.

[Brief explanation of drawings]

1 and 2 show a conventional molding method using a metal mold, (A) is a side view, and (B) is a cross-sectional view taken along line AA and line B-8. The third side is a drawing explaining the invention in detail. a...Caliper body b--Rotor width mold e--
・Cylinder part mold d・・・・・・Inner dimension of pawl f・・・・・・Cave part Fig. 1 j+B Fig. 3

Claims (1)

[Claims] (1) When casting a caliper body using a mold, in a method in which the rotor width portion and the syringe portion are simultaneously molded using the mold, the rotor width molding mold has a portion facing the cylinder portion molding mold. A cavity is provided in which the cylinder molding mold can move in and out, and when casting the caliper body, the rotor width molding mold is placed on the rotor width, and the cylinder molding mold is placed on the cylinder. Manufacture of a disc brake caliper body characterized in that when casting is performed and the cast caliper body is taken out from the mold, a cylinder part molding mold is housed in a cavity part of a rotor width part molding mold and the mold is removed. Method.