CN102814855A - Wide step ceramic shell isostatic pressing forming mould - Google Patents

Abstract

The invention discloses a wide step ceramic shell isostatic pressing forming mould which is characterized by comprising an upper mould (1), a lower mould (2) and a pull rod (3). A central hole (4) is arranged at the center of the upper mould (1), a threaded hole (5) is arranged at the center of the contact surface of the lower mould (2) and the upper mould (1), the pull rod (3) is arranged in the central hole (4) of the upper mould (1), the lower end of the pull rod (3) is connected with the threaded hole (5) of the lower mould (2), the pull rod (1) is used for fixing the upper mould (1) and the lower mould (2), a groove (6) is arranged beside the central hole (4) of the upper mould (1), a spring (7) is arranged in the groove (6), and one surface of the spring (7) is contacted with the surface of the lower mould (2). An elastic body is arranged between moulds, the elastic body is in loose state in a stuffing process, a whole mould mechanism is locked after stuffing is finished, the elastic body is compressed so as to enable the stuffing at the step portion to be compressed, compactness of the step portion is improved, damage quantity is reduced in a product after-treatment process, the proportion of discarded products caused by insecure steps in a product using process is reduced greatly, and product quality is improved.

Description

Wide step ceramic shell isostatic pressing mold

technical field

The invention relates to a ceramic shell mold of a vacuum interrupter, which belongs to the technical field of vacuum interrupter manufacture.

Background technique

The ceramic vacuum shell is an upgraded product of the glass vacuum shell. It has only a history of more than 20 years in our country, and before that, hot die-casting was used as the main production process. In recent years, the ceramic vacuum shell prepared by isostatic pressing has been recognized by the vacuum tube industry and started. widely used. Compared with the previous method, the isostatic pressing method has the characteristics of high density of porcelain body, good air tightness, and greatly improved strength of ceramics after metallization. However, in the production of wide-step ceramic shells, because the steps of the ceramic shell itself are wide, and the extension of the steps is basically at a right angle, the internal structure of the mold is complicated, and the production of fillers is troublesome. Not enough, resulting in damage in post-processing or early damage to the porcelain shell during the product life cycle.

Contents of the invention

The object of the present invention is to provide a reasonable structure of a mold for isostatic pressing of a wide-step ceramic shell, so as to avoid unstable quality of the step part due to insufficient filler.

The composition of the present invention includes an upper mold, a lower mold and a tie rod. The center of the upper mold has a central hole, and the center of the contact surface of the lower mold and the upper mold has a screw hole. The tie rod is placed in the center hole of the upper mold. The lower end and the lower mold The screw hole connection is used to fix the upper mold and the lower mold. There is a groove next to the center hole of the upper mold, and a spring is placed in the groove, and one side of the spring is in contact with the surface of the lower mold.

In the above-mentioned isostatic molding mold for wide-step ceramic shells, there are pins above the pull rod, a positioning platform 1 is provided in the middle, and a thread is opened on the bottom of the positioning platform 2. The pull rod reaches the The positioning effect, the screw thread under the tie rod and the screw hole on the lower mold realize the fixing effect.

In the isostatic pressing mold for the wide-step ceramic shell, a rubber plate is placed above the upper mold, a rubber ring is placed on the lower mold, and waterproof rubber sleeves are provided on the outside of the rubber plate and the rubber ring.

In the isostatic molding mold for the wide-step ceramic shell described above, the spring may be a rubber elastic body.

In the isostatic pressing molding die for the wide-step ceramic shell, a metal plate is installed under the rubber plate.

Compared with the prior art, the present invention adds an elastic body between the upper mold and the lower mold, and the stepped part of the mold is in a relaxed state during the filling process, and is subjected to pressure during molding, and the ceramic material at the step is simultaneously radial and axial. The force makes the filling of the step part compressed, and the density of the step part after forming is very high, which is consistent with other parts of the green body, which ensures the overall quality of the ceramic shell, and can achieve quantitative filling. The green body pressed by this mold The structure is reasonable to reduce the processing of the porcelain shell body in the later stage.

Description of drawings

Accompanying drawing 1 is a structural representation of the present invention;

Accompanying drawing 2 is the structure diagram of tie rod of the present invention.

Marked in the accompanying drawings: 1-upper mold, 2-lower mold, 3-tie rod, 4-center hole, 5-screw hole, 6-groove, 7-spring, 8-pin, 9-positioning table one, 10-positioning platform two, 11-thread, 12-step, 13-rubber plate, 14-rubber ring, 15-waterproof rubber sleeve, 16-metal plate

Detailed ways

The practical method of the present invention in the actual production process is as follows. First, the lower mold 2 is placed on the horizontal operating table, the rubber ring 14 is placed on the lower part of the lower mold 2, and the spring 7 is placed in the groove 6 of the upper mold 1. The mold 1 is placed on the lower mold 2, the pull rod 3 is fixed in the center hole 4 of the upper mold 1, the railing 3 can rotate freely in the center hole 4 but cannot be pulled out, and the waterproof rubber sleeve 15 is set on the outside of the whole device, using The tool rotates the pull rod 3, and the thread 11 on the pull rod 3 cooperates with the screw hole 5 on the lower mold 2 to control the thickness of the material at the step 12. At this time, the spring 7 is in a state of about force and is not fully compressed; then start to fill, pull the rod Positioning platform one 9 on 3 cooperates with step 12 on upper mold 1 to make upper mold 1 and lower mold 2 tightly combined, and positioning platform 2 10 on tie rod 3 can control the combination between upper mold 1 and lower mold 2 to prevent upper mold 1 and lower mold 2 Mold 1 and lower mold 2 are too tightly combined to cause damage to the mold; remove excess filler, place rubber plate 13 on the top of mold 1, and assemble the rubber plate 13 with the metal plate 16 facing downwards, and the rubber plate 13 is used for isolation The role of the liquid, on the one hand, prevents the liquid from entering the filler to contaminate the filler, and on the other hand, prevents the liquid from entering the center hole 4 to corrode the tie rod 3 and other structures. The diameter of the metal plate 16 is larger than the diameter of the center hole 4. During the molding process, The liquid will cause a very large pressure on the mold. The pressure in the center hole 4 is much lower than the external pressure, which will easily cause the rubber plate 13 to be squeezed into the center hole 4, resulting in abnormal damage to the rubber plate 13. The metal plate 16 is used to protect the rubber plate 13 to prevent excessive external pressure from breaking down or damaging the rubber plate 13; the assembled mold is shown in Figure 1, and the spring 7 in the figure can be replaced by a rubber elastic body. increase, the pressure on the mold is also increasing, and the spring 7 is slowly compressed until it is completely compressed when the external pressure rises to the maximum. The part is extruded by the upper mold 1 and the lower mold 2 from loose to tight, and the molding process can be completed by decompression after going through the constant pressure process.

After the isostatic pressing is completed, when unloading the mold, only the rubber plate 13 needs to be taken off, the practical tool and the pin 8 are used to rotate the pull rod 3 in the opposite direction, and the pull rod 3 and the upper mold 1 are taken off together, and the The ceramic cylinder body is taken out as a whole. After cleaning the parts of the mold, it can be put into the next use.

Claims (5)

1. The mold for isostatic pressing of wide-step ceramic shells is characterized in that it includes an upper mold (1), a lower mold (2) and a tie rod (3), the center of the upper mold (1) has a center hole (4), and the lower mold (2) There is a screw hole (5) in the center of the contact surface with the upper mold (1), the tie rod (3) is placed in the center hole (4) of the upper mold (1), and the lower end is connected with the screw hole of the lower mold (2). (5) connection, used to fix the upper mold (1) and the lower mold (2), there is a groove (6) next to the center hole (4) of the upper mold (1), and a spring (6) is placed in the groove (6) 7), one side of the spring (7) is in contact with the surface of the lower mold (2). 2. The isostatic pressing mold for wide-step ceramic shell according to claim 1, characterized in that: there is a pin (8) above the pull rod (3), a positioning platform 1 (9) is provided in the middle section, and the positioning platform Two (10), there is a thread (11) on the bottom, and the pull rod (3) passes through the positioning table one (9) and the step (12) in the center hole (4) of the upper mold (1) to achieve the positioning effect, and the bottom of the pull rod (3) The screw thread (11) and the screw hole (5) on the lower mold (2) realize the fixing effect. 3. The isostatic pressing mold for wide-step ceramic shell according to claim 1, characterized in that: a rubber plate (13) is placed above the upper mold (1), and a rubber ring is placed on the lower mold (2) (14), the outside of rubber plate (13) and rubber ring (14) has waterproof rubber cover (15). 4. The wide-step ceramic shell isostatic pressing mold according to claim 1, characterized in that: the spring (7) is a rubber elastic body. 5. The wide-step ceramic shell isostatic pressing mold according to claim 1, characterized in that: a metal plate (16) is installed under the rubber plate (13).

Images