Bimetal brake drum centrifugal casting mold

Abstract

The utility model relates to the field of brake drum production, in particular to a bimetal brake drum centrifugal casting die which comprises a centrifugal casting machine, a casting die and a brake drum steel shell, the casting die comprises a connecting disc, a cage-shaped outer sleeve, a supporting disc, a positioning disc and a centering ring, the casting die is installed on the centrifugal casting machine through the connecting disc, and the cage-shaped outer sleeve is installed on the casting die. The cage-shaped outer sleeve is coaxially connected to the circumferential edge of the front end face of the connecting disc, the supporting disc is coaxially connected to the center of the front end face of the connecting disc, the positioning disc is coaxially connected to the front end of the supporting disc, the brake drum steel shell is coaxially installed on the inner side of the cage-shaped outer sleeve, and the positioning disc is coaxially sleeved with the inner circle face of the small end of the brake drum steel shell through the centering ring. A large-end lining and a middle lining are arranged between the outer sides of the large-end outer circle face and the middle outer circle face of the brake drum steel shell and the inner wall of the cage-shaped outer sleeve in a cushioned mode respectively. The mold can effectively reduce the deformation of the bimetal brake drum during high-temperature centrifugal casting molding, and provides a relatively good foundation for subsequent processing.

Description

Technical Field

[0001] The utility model belongs to the technical field of brake drum production, and in particular relates to a centrifugal casting mold for a bimetallic brake drum. Background Art

[0002] Brakes are core components of automobiles. They are used for braking of vehicles and play a very important role in driving safety. Common brakes are mainly divided into disc brakes and drum brakes. Brake drums are core components used for vehicle braking. The purpose of decelerating and braking the vehicle is achieved through the friction between the inner wall of the finished brake drum and the brake shoe. The bimetallic brake drum is a gray cast iron friction layer cast on the inner wall of the steel shell of the brake drum. The steel shell is used to ensure mechanical strength and toughness, while the inner gray cast iron layer has good friction performance. Vehicles need greater braking force when driving at high speed or under heavy load. The bimetallic brake drum is spun by steel shell, and cast iron is cast on the inner wall to play the role of wear resistance and increase friction coefficient, which can effectively avoid the cracking and failure of the brake drum caused by the rotation of the vehicle. At present, the centrifugal casting method is mainly used to manufacture bimetallic brake drums. The casting mold is an important production tool of the centrifugal casting process. However, the existing centrifugal casting mold of bimetallic brake drums has the problem of serious deformation of the cast brake drum when centrifugally cast at high temperature, which is very unfavorable for the subsequent processing of the brake drum. Utility Model Content

[0003] In view of the above situation, the utility model provides a bimetallic brake drum centrifugal casting mold, which can effectively reduce the deformation of the brake drum during high-temperature centrifugal casting.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A bimetal brake drum centrifugal casting mold comprises a centrifugal casting machine, a casting mold installed on the centrifugal casting machine, and a brake drum steel shell installed in the casting mold.

[0006] The casting mold comprises a connecting plate, a cage-shaped outer sleeve, a supporting plate, a positioning plate and a centering ring.

[0007] The casting mold is installed on the centrifugal casting machine through the connecting plate, and the rear end of the cage-shaped outer sleeve is coaxially connected to the circumferential edge of the front end surface of the connecting plate.

[0008] The support plate is coaxially connected to the central part of the front end surface of the connection plate, the positioning plate is coaxially connected to the front end of the support plate, and the steel shell of the brake drum is coaxially installed on the inner side of the cage-shaped outer sleeve.

[0009] The inner circular surface of the small end of the brake drum steel shell is coaxially sleeved on the front outer side of the positioning plate through the centering ring. The brake drum steel shell, the centering ring and the positioning plate are all located inside the cage-shaped outer sleeve.

[0010] A large end lining is provided between the large end outer cylindrical surface of the brake drum steel shell and the cage-shaped outer sleeve, and a middle lining is provided between the middle outer cylindrical surface of the brake drum steel shell and the cage-shaped outer sleeve.

[0011] Furthermore, the connecting plate is a disc-shaped structure, and the connecting plate detachably connects the casting mold to the rotating station of the centrifugal casting machine by installing bolts.

[0012] Furthermore, the cage-shaped jacket includes two concentric rings located at its front and rear ends, the two concentric rings are supported and connected by four mutually parallel connecting columns, and the rear end of the cage-shaped jacket is fixedly connected to the front end of the connecting plate by connecting bolts.

[0013] Furthermore, the front and middle parts of the four connecting columns of the cage-shaped jacket are provided with front grooves and middle grooves for positioning the large end linings and the middle linings, and the large end linings and the middle linings are correspondingly clamped and fixed in the front grooves and the middle grooves by fixing bolts.

[0014] Furthermore, the support plate is fixedly connected to the front end of the connecting plate by means of locking bolts, and the centrifugal casting production requirements of bimetallic brake drums of different heights can be met by changing the height of the support plate.

[0015] Furthermore, the positioning plate is fixedly connected to the front end of the support plate by fastening bolts. The front part of the positioning plate is also provided with a step portion with a smaller outer diameter that matches the positioning plate; and the rear end surface of the positioning plate is also provided with a positioning groove that matches and engages with the support plate.

[0016] Furthermore, the centering ring is fixed to the front end of the positioning plate by means of a clamping bolt; a reducing step with an enlarged outer diameter is provided at the front end of the centering ring to prevent the steel shell of the brake drum from slipping forward during the centrifugal casting process and causing a safety accident.

[0017] The utility model also includes other components that enable it to be used normally, all of which are conventional means in the field. In addition, devices or components not limited in the utility model, such as centrifugal casting machines and brake drum steel shells, all adopt the existing technology in the field.

[0018] The beneficial effects of the utility model are as follows:

[0019] The bimetallic brake drum centrifugal casting mold provided by the utility model can effectively reduce the deformation of the bimetallic brake drum during high-temperature centrifugal casting, and can quickly adjust to meet the centrifugal casting needs of brake drums of different diameters and heights. Furthermore, during the centrifugal casting process of the brake drum, the irregular changes in the outer circle of the centrifugal casting of the bimetallic brake drum can be effectively reduced to achieve a relatively regular outer circle, thereby providing a relatively good basic condition for subsequent processing and ensuring the product quality of the final product of the bimetallic brake drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the centrifugal casting mold for the bimetallic brake drum in the embodiment.

[0021] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of the centering ring in part A. DETAILED DESCRIPTION

[0022] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments.

[0023] It should be noted that the terms "upper", "lower", "front", "back", "inside", "outside" and the like indicating directions or positional relationships are based on the drawings and are for the convenience of description only.

[0024] Example

[0025] like Figure 1 As shown, a bimetallic brake drum centrifugal casting mold includes a centrifugal casting machine (not shown in the figure) and a casting mold installed on the centrifugal casting machine, and a brake drum steel shell 8 installed in the casting mold. The brake drum steel shell is used as a high-temperature centrifugal casting blank, and a layer of gray cast iron friction layer is cast on the inner wall of the brake drum steel shell to manufacture a bimetallic brake drum.

[0026] The casting mold comprises a connecting plate 1 , a cage-shaped outer sleeve 2 , a supporting plate 5 , a positioning plate 6 and a centering ring 7 .

[0027] The casting mold is installed on the centrifugal casting machine through the connecting plate, and the rear end of the cage-shaped outer sleeve is coaxially connected to the circumferential edge of the front end surface of the connecting plate.

[0028] The support plate is coaxially connected to the central part of the front end surface of the connection plate, the positioning plate is coaxially connected to the front end of the support plate, and the steel shell of the brake drum is coaxially installed on the inner side of the cage-shaped outer sleeve.

[0029] The inner circular surface of the small end of the brake drum steel shell is coaxially sleeved on the front outer side of the positioning plate through the centering ring. The brake drum steel shell, the centering ring and the positioning plate are all located inside the cage-shaped outer sleeve.

[0030] A large end lining 3 is provided between the large end outer circumferential surface of the brake drum steel shell and the cage-shaped outer sleeve, and a middle lining 4 is provided between the middle outer circumferential surface of the brake drum steel shell and the cage-shaped outer sleeve.

[0031] The connecting plate is a disc-shaped structure, and the connecting plate detachably connects the casting mold to the rotating station of the centrifugal casting machine through mounting bolts.

[0032] The cage-shaped jacket comprises two concentric rings at its front and rear ends, the two concentric rings are supported and connected by four mutually parallel connecting columns, and the rear end of the cage-shaped jacket is fixedly connected to the front end of the connecting plate by connecting bolts.

[0033] The front and middle parts of the four connecting columns of the cage-shaped jacket are provided with front grooves and middle grooves for positioning the large end linings and the middle linings. The large end linings and the middle linings are correspondingly clamped and fixed in the front grooves and the middle grooves by fixing bolts, which play a role in preventing the steel shell blank of the brake drum from eccentric deformation during high-temperature centrifugal casting. And by replacing the large end linings and the middle linings of different thicknesses, the production requirements of brake drums with different outer diameters can be met.

[0034] The supporting plate is fixedly connected to the front end of the connecting plate by means of locking bolts.

[0035] The positioning plate is fixedly connected to the front end of the supporting plate by fastening bolts.

[0036] The front part of the positioning plate is also provided with a step portion with a smaller outer diameter, and the positioning plate is coaxially sleeved on the outside of the step portion; the rear end surface of the positioning plate is also provided with a positioning groove, and the front end of the support plate is engaged and snap-fitted into the positioning groove.

[0037] The centering ring is fixed to the front end of the positioning plate by means of a clamping bolt.

[0038] like Figure 2 As shown, the front end of the centering ring is also provided with a reducing step 9 with an enlarged outer diameter, which is used to clamp the inner circular surface of the small end of the brake drum steel shell for positioning to prevent the brake drum steel shell from slipping forward during the centrifugal casting process.

[0039] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to ordinary technicians in this technical field. Any technical deformation made within the spirit and principles of the present invention falls within the protection scope of the present invention.

Claims

1. A bimetallic brake drum centrifugal casting mold, comprising a centrifugal casting machine and a casting mold mounted on the centrifugal casting machine, and a brake drum steel shell mounted in the casting mold, characterized in that: The casting mold includes a connecting plate, a cage-shaped sleeve, a supporting plate, a positioning plate and a centering ring. The casting mold is installed on a centrifugal casting machine through the connecting plate. The rear end of the cage-shaped sleeve is coaxially connected to the circumferential edge of the front end surface of the connecting plate, the supporting plate is coaxially connected to the central part of the front end surface of the connecting plate, the positioning plate is coaxially connected to the front end of the supporting plate, the brake drum steel shell is coaxially installed on the inner side of the cage-shaped sleeve, the small end inner circular surface of the brake drum steel shell is coaxially sleeved on the front outer side of the positioning plate through the centering ring, a large end lining is padded between the large end outer circular surface of the brake drum steel shell and the cage-shaped sleeve, and an intermediate lining is padded between the middle outer circular surface of the brake drum steel shell and the cage-shaped sleeve.

2. A bimetallic brake drum centrifugal casting mold according to claim 1, characterized in that: The connecting plate is a disc-shaped structure, and the connecting plate detachably connects the casting mold to the centrifugal casting machine through mounting bolts.

3. A bimetallic brake drum centrifugal casting mold according to claim 1, characterized in that: The cage-shaped jacket comprises two concentric rings at its front and rear ends, the two concentric rings are supported and connected by four mutually parallel connecting columns, and the cage-shaped jacket is fixedly connected to the front end of the connecting plate by connecting bolts.

4. A bimetallic brake drum centrifugal casting mold according to claim 3, characterized in that: The front and middle parts of the four connecting columns of the cage-shaped jacket are provided with front grooves and middle grooves for positioning the large end linings and the middle linings. The large end linings and the middle linings are correspondingly clamped and fixed in the front grooves and the middle grooves by fixing bolts.

5. The centrifugal casting mold for a bimetallic brake drum according to claim 1, characterized in that: The supporting plate is fixedly connected to the front end of the connecting plate by means of locking bolts.

6. A bimetallic brake drum centrifugal casting mold according to claim 5, characterized in that: The positioning plate is fixedly connected to the front end of the supporting plate by fastening bolts.

7. A bimetallic brake drum centrifugal casting mold according to claim 1, characterized in that: The centering ring is fixed to the front end of the positioning plate by means of a clamping bolt.

8. A bimetallic brake drum centrifugal casting mold according to claim 7, characterized in that: The front end of the centering ring is provided with a reducing step with an enlarged outer diameter, which is used to clamp the inner circular surface of the small end of the steel shell of the brake drum.

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