Method for manufacturing an impeller of a pump

• US 5,960,543 A
• Filed: 11/14/1997
• Issued: 10/05/1999
• Est. Priority Date: 11/21/1996
• Status: Expired due to Fees

• Current Assignee: Daewoo Electronics (Government of South Korea)
• Original Assignee: Daewoo Electronics (Government of South Korea)
• Inventors: Moon, Seong-Dae
• Primary Examiner(s): ROSENBAUM, IRENE CUDA
• Application Number:
  US08/970,352
• Time in Patent Office: 690 Days
• Field of Search: 29/23.51, 29/889.2, 29/889
• US Class Current: 29/889.2
• CPC Class Codes: B29C 65/0627 Angular, i.e. torsional B29C65/082 takes precedence
• CPC Class Codes: B29C 65/085 using a rotary sonotrode
• CPC Class Codes: B29C 66/5344 said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends B29C66/5346 takes precedence
• CPC Class Codes: B29C 66/54 Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
• CPC Class Codes: B29C 66/8242 Pneumatic or hydraulic drives using fluid pressure directly acting on the parts to be joined B29C66/8266
• CPC Class Codes: B29C 66/8322 Joining or pressing tools reciprocating along one axis
• CPC Class Codes: B29C 66/9513 characterised by specific vibration frequency values or ranges
• CPC Class Codes: B29L 2031/7496 Pumps
• CPC Class Codes: B29L 2031/7498 Rotors with blades B29L2031/08
• CPC Class Codes: Y10T 29/37 Impeller making apparatus
• CPC Class Codes: Y10T 29/4932 Turbomachine making

Abstract

Apparatus and method for manufacturing an impeller consisting of a body with many vanes and a shroud joined with the body. The apparatus comprises a die for chucking the body, a horn for supporting the shroud to be in contact with the vanes while the body is chucked by the die, a torque motor for applying vibration to the horn, and a pneumatic cylinder for giving pressure to the torque motor so that the shroud and the body are pushed in a contacting direction with each other. The torque motor is driven by half-wave rectified alternating current, and generates twisting vibration of the frequency between 10 Hz and 1 kHz. The shroud and the body are firmly joined by the twisting vibration. Thus little burr is generated. Further, the present invention can be adopted for manufacturing the impeller elements of diverse materials.

Claims

1. An apparatus for manufacturing an impeller consisting of a body having a plurality of vanes and a shroud being joined with said body, said impeller for discharging water flowed into a housing of a pump, said apparatus comprising:

a die for chucking said body;

a horn for supporting said shroud to be in contact with said vanes of said body, said horn amplifying a vibration transmitted thereto;

a torque motor for generating and applying a twisting vibration to said horn,

wherein said torque motor has a stator and an armature for generating a rotational torque through magnetic force resulting from an input half-wave rectified alternating current, a rotational shaft rotating through the rotational torque generated by the stator and the armature, and a torsion bar in which one end thereof is connected with said rotational shaft and the other end thereof is fixed at a predetermined position, whereby the twisting vibration is generated by rotation and return of said rotational shaft according to the input half-wave rectified alternating current;

a controlling means having a fixing plate assembled with said torsion bar to be movable relative to said torsion bar along a longitudinal direction of said torsion bar, and a control cylinder for moving said fixing plate along the longitudinal direction of said torsion bar and controlling a torsion constant of said torsion bar by varying a length between the fixing plate and the rotational shaft through the vertical movement of the fixing plate; and

a pneumatic cylinder for forcing the torque motor toward the die so that said shroud is in contact with said body.