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US 2021/0299765 A1Published application
Method for machining thin plates and elastic joints particularly for monolithic mechanical oscillators
AssigneeUniversità Degli Studi Di Salerno
InventorsFabrizio BARONE, Gerardo GIORDANO
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Abstract
Described herein is a method for manufacturing thin metal sheets and joints by removing material from a single block of material, i.e. for obtaining items including one or more thin sheets and/or thin elastic joints seamlessly connected to one another by means such as milling. The method can be employed in the manufacturing of a high-sensitivity, low-frequency, broadband monolithic mechanical sensor for measuring linear and angular displacements of based on a folded pendulum configuration for monitoring and control applications.
Claims16
A method for manufacturing a thin metal sheet or joint which includes removing material from a blank by means of milling, the method comprising the following steps:
- A. Preparing said blank so that:
- A1. There is a first face and a second face opposite to said first face;
- and
- A2. There are two apertures through said first and second faces in a crossing direction of said first and second faces, the two apertures mutually defining an element therebetween having a main extension direction which runs between the two apertures and having a first side and a second side which extend in said main extension direction and in said crossing direction;
- B. Working said first side, removing by means of milling at least one portion of the material of said element along said crossing direction, starting from said first face to a depth greater than a design depth of the elastic joint or of the thin metal sheet and along said main extension direction;
- C. Working said second side, in the same manner as the first side in step B, thus obtaining a worked element from said;
- D. Perforating said blank in a direction parallel to said main extension direction and at a depth, in said crossing direction, starting from said first face, which is greater than the design depth, so that a free space is created between said worked element and the rest of said blank in said crossing direction;
- and
- F. Removing from said blank at least one portion of material adjacent to said worked element until said worked element is detached from said blank, thus obtaining the thin metal sheet or a joint.
6 more elements
A method for achieving a monolithic folded pendulum from a blank which includes a milling process, the method comprising the following steps:
- LA. Preparing said blank so that:
- LA1. it comprises two opposite flat main faces;
- and
- LA2. there are eight pairs of apertures on said two flat main faces in a direction substantially perpendicular to said two flat main faces, in each pair of apertures there being defined an element with a main extension direction and a first side and a second side, opposite to the first side, along said main extension direction, said first side and said second side having a surface substantially perpendicular to said two flat main faces;
- LB. In each pair of apertures, working said first side, by milling a portion of the material of said element along said perpendicular direction from one of said two flat main faces to a depth deeper than a design depth;
- LC. In each pair of apertures, working said second side, by milling a portion of the material of said element along said perpendicular direction from one of said two flat main faces to a depth (ps) deeper than a design depth,
- wherein the operation of steps LB and LC is adapted to form a worked element between each pair of apertures, and wherein the following further steps are performed:
- LD. Drilling four holes in a first connecting face of said blank which connects said two flat main faces, the four holes being formed at said deeper depth (ps) parallel to the respective four worked elements, so that said four worked elements are removed from the material of the blank substantially at said design depth;
- LE. Drilling four further holes in a second connecting face of said blank which connects said two flat main faces, said second connecting face being opposite to said first connecting face, the further four holes being formed at said deeper depth (ps) parallel to the respective further four worked elements, so that said four worked elements are detached from the material of the blank substantially at said design depth, thus obtaining corresponding joints;
- LF. At two joints per face, removing respective material of said blank which is not adjacent to each elastic joint, so that the elastic joint is connected at one end only to a central portion of said blank worked to act as an oscillating mass in the folded pendulum;
- LG. Applying an immobilization system of said elastic joints to at least one of the two flat main faces by immobilizing of the portions of said blank along said main extension direction between elastic joints;
- and
- LH. Working the blank so as to detach said four joints and said central portion from the rest of the blank, thus obtaining a free central mass, creating as many pendulum arms which connect said free central mass to a frame by means of the elastic joints, according to a folded pendulum scheme.
10 more elements
Dependencies are inferred from the claim text.