Method of making a weight-type exercise device and a dumbbell and bell piece produced by the method

1. A method of making a weight-type exercise device, comprising the steps of:

(1) prefabricating an outer shell half and an inner shell half;

(2) forming a slurry inlet port in the outer shell half;

(3) mating and sealing the outer shell half with the inner shell half to form a unitary weight shell;

(4) pouring a mixed slurry into the unitary weight shell through the slurry inlet port;

(5) subjecting the unitary weight shell to a shaking treatment;

(6) sealing up the slurry inlet port with a steel plate; and

(7) finishing the surface of the unitary weight shell by painting and baking.

2. The method of claim 1 , wherein the outer shell half is an outer half of a dumbbell shell or an upper half of a weight plate shell, and wherein the inner shell half is an inner half of the dumbbell shell or a lower half of the weight plate shell.

3. The method of claim 1 , wherein the outer shell half and the inner shell half are both fabricated using a deep drawing process.

4. The method of claim 1 , wherein the outer shell half is mated and sealed with the inner shell half by welding.

5. The method of claim 1 , wherein the mixed slurry comprises a mixture of iron sand and cement, a mixture of cement and copper powder, a mixture of iron slag and cement, a mixture of iron slag and copper powder, or a mixed slurry of iron sand, sand, mud and wood dust.

6. The method of claim 1 , wherein the shaking treatment to which the unitary weight shell is subjected is carried out by a shaking machine.

7. The method of claim 1 , wherein the slurry inlet port is sealed up with the steel plate by welding.