阅读说明：本技术 用于在基板上烧结电子部件的烧结施压机的施压组件 (Pressing assembly of sintering press for sintering electronic components on a substrate ) 是由 尼古拉·斯基瓦洛基 于 2019-06-19 设计创作，主要内容包括：用于烧结施压机的施压组件(14),所述烧结施压机用以在基板(12)上执行电子部件(10)的烧结,施压组件包括：多杆缸体(20),该多杆缸体具有前头部(22)和后头部(24),该前头部和后头部一起界定了压缩室(26)。在前头部(22)中,施压杆(28)以彼此平行且独立的方式被滑动地支撑,所述施压杆的后端部突出到压缩室(26)中。在压缩室(26)中,致动用平坦垫圈(30)在施压杆的后端部上延伸。致动用平坦垫圈(30)通过锚固框架(34)固定至前头部,锚固框架接合致动用平坦垫圈(30)的周缘部分(30’),锚固框架(34)被完全容置在压缩室中,使得加压流体也作用在所述锚固框架上。(Pressing assembly (14) for a sintering press for performing sintering of an electronic component (10) on a substrate (12), comprising: a multi-rod cylinder (20) having a front head (22) and a rear head (24) that together define a compression chamber (26). In the front head (22), pressing rods (28) whose rear ends protrude into the compression chamber (26) are slidably supported in parallel and independently from each other. In the compression chamber (26), an actuating flat washer (30) extends over the rear end of the pressure bar. The actuating flat gasket (30) is fixed to the front head by an anchoring frame (34) engaging a peripheral portion (30') of the actuating flat gasket (30), the anchoring frame (34) being housed completely in the compression chamber so that the pressurized fluid also acts on said anchoring frame.)

1. Pressing assembly (14) for a sintering press for performing sintering of electronic components (10) on a substrate (12), comprising a multi-rod cylinder (20) having a front head (22) and a rear head (24) which together define a compression chamber (26), wherein:

-between the front head and the rear head, an annular sealing element (25) positioned around the compression chamber (26) is interposed,

-an inlet channel (32) is made in said rear head (24) for introducing a pressurized fluid into said compression chamber;

-in said front head (22) there are slidably supported pressure-exerting rods (28) parallel and independent from each other, the rear ends of which protrude into said compression chamber (26),

-in the compression chamber (26), an actuating flat gasket (30) extends on the rear end of the pressure-exerting rod, so that when the compression chamber (26) is pressurized, the actuating flat gasket (30) acts on the rear end to transmit the pressure in the compression chamber to each individual pressure-exerting rod (28),

-the actuating flat washer (30) is fixed to the front head by an anchoring frame (34) engaging a peripheral portion (30') of the actuating flat washer (30),

-the anchoring frame (34) is completely housed in the compression chamber, so that the pressurized fluid also acts on the anchoring frame.

2. Pressing assembly according to the preceding claim, wherein the compression chamber (26) forms a bottom wall (27) opposite the flat gasket (30), and wherein the anchoring frame (34) has a rear surface (34b) facing and separated from the bottom wall.

3. Pressing assembly according to claim 1 or 2, wherein the compression chamber (26) is delimited radially by a side wall (29), and wherein the anchoring frame has a side surface (34c) facing the side wall and separated therefrom.

4. Pressure-exerting assembly according to any one of the preceding claims, wherein the anchoring frame (34) is screwed to the front head (22).

5. Pressure application assembly according to any one of the preceding claims, wherein the flat gasket (30) divides the compression chamber into a front portion (26') into which a rear end of the pressure application rod projects and a rear portion (26 ") in fluid communication with the inlet conduit (32).

6. Pressing assembly according to the preceding claim, wherein the front portion of the compression chamber is obtained in a lower portion (22a) of the front head.

7. Pressing assembly according to any one of the preceding claims, further comprising a heating block (40) integral to the multi-rod cylinder (20) and slidingly supporting heating pressing members (42), each heating pressing member (42) being operated by a respective pressing rod (28) to act on a respective electronic component (10) to be sintered, the heating block (40) being provided with heating means (44) to heat the heating pressing members (42).

8. Pressing assembly according to the preceding claim, wherein each pressing rod (28) ends with a rounded end (28 ") which is in contact with a flat end surface of the respective pressing member (42).

9. Pressing assembly according to the preceding claim, wherein the heated pressing member (42) is in the form of a rod having a cross section substantially corresponding to or larger than the area of the housing of the respective electronic component (10) to be sintered.

10. Pressing assembly according to claim 8 or 9, wherein the heating pressing member (42) slides with lateral play into a respective axial seat (46) of the heating pressing member made in the heating block (40), so as to accommodate any inclination of the electronic component (10) with respect to the plane defined by the substrate (12).

11. Pressing assembly according to any one of the preceding claims, comprising a peripheral frame (50) supporting a protective film (52), for example made of PTFE, which extends beyond the front end of the pressing rod (28) or beyond the heating pressing member (42), if present, and which supports suction/blowing means facing the protective film (52) and suitable for attaching/removing the protective film (52) to/from the front end.

12. Sintering press comprising a pressing assembly according to any one of the preceding claims and a support unit (60) facing the pressing assembly (14) and suitable for supporting at least one substrate (12), at least one of the pressing assembly (14) and support unit (60) being axially translatable with respect to the other between a retracted rest position and an advanced pressing position, wherein the electronic component (10) is engageable by the pressing rod (28) or the heating pressing member (42).

13. The press according to the preceding claim, wherein the support unit (60) comprises a fixed reaction block (62), a heating block (64) suitable for heating each substrate (12), and a movable reaction block (66).

14. The press according to the preceding claim, wherein at least one deformation cylinder (68) is housed in the fixed reaction block (62) together with an associated deformation sensor (70).

15. Method for sintering electronic components on a substrate by means of a sintering press according to any of claims 12 to 14, comprising the steps of:

-establishing a constant sintering pressure to be applied to all electronic components to be sintered;

-equipping the pressing assembly with pressing bars having respective pushing sections according to the pressing surfaces of the respective electronic components;

-positioning the substrate with the sintering paste and the electronic component to be sintered in a press machine so that the electronic component is in contact with the front end of the heating press member or press bar;

-heating the pressure applying member to a predetermined sintering temperature;

-pressurizing the compression chamber to a predetermined sintering pressure;

-maintaining the sintering pressure and sintering temperature for a predetermined sintering time;

-removing the substrate from the sintering press.

16. Method according to the preceding claim, wherein the substrate is also heated to a sintering temperature.

17. A method according to claim 15 or 16, wherein a protective film is attached to the end of the heating pressure member or pressure bar prior to the step of positioning the substrate.

18. The method of any one of claims 15 to 17, wherein after the step of removing the substrate, the pressure of the compression chamber is brought to be lower than the sintering pressure but higher than atmospheric pressure, such that the compression rod and any heated pressing member act as pressure bars.

19. The method according to any one of claims 15 to 18, wherein, during the step of pressurizing the compression chamber to a predetermined sintering pressure, the sealing membrane is deformed so that it rests both on the rear end of the pressure-applying rod and on the substantially flat bottom wall of the front portion of the compression chamber.