JP6295089B2 - Ceramic end tab - Google Patents

Description

  The present invention relates to a ceramic end tab having a slit for separation.

  Ceramic end tabs that are easy to attach to the base material and do not require post-processing after welding (such as cutting off the protruding part from the base material) are widely used in place of conventional steel end tabs. .

  The ceramic end tab is generally configured by putting a material such as alumina in a mold, press-molding, and drying and firing the compact. Therefore, it is possible to create various shapes. For example, as shown in Patent Document 1, a slit for separation can be provided in advance so that the shape can be changed according to the size and shape of the welded portion. It is.

Japanese Utility Model Publication No. 1-100697

  By the way, the slit for separation as disclosed in Patent Document 1 is usually formed at the time of pressure molding by a slit forming protrusion provided in each of a pair of molds (upper mold and lower mold) facing each other. It is formed.

  As the protrusion length increases, the thickness of the thin part formed between the slits decreases as the protrusion length increases.Therefore, the force required for separation is small, and cracks occur at unintended portions during separation. The possibility of failure is also reduced. Therefore, it is desirable that the protrusion length of the protrusion is increased to some extent.

  However, since the molded body before firing is brittle, if the protruding length of the protruding portion is long, there is a problem that it becomes difficult to release. Specifically, the mold release is roughly divided into two stages. First, the upper mold (the upper mold at the time of pressure molding) is moved upward to form a molded body and a horizontal mold (pressure molding). At a time, the mold is released from the upper side of the molded body by separating the mold from the mold surrounding the side surface of the molded body, and then the lower mold (the lower mold at the time of pressure molding) is moved along the horizontal mold. After moving the mold upward to expose the side of the molded product, the molded product is removed from the lower mold to complete the mold release on the lower side of the molded product. If the mold is forcibly released, it may break from the thin part. In particular, when removing the molded body from the lower mold, the molded body is lifted by grasping the side surface, so that a relatively large bending stress is likely to occur in the molded body, and further, the support by the upper mold and the horizontal mold is released. The possibility of breakage is significantly higher than when the upper mold is separated from the molded body. For this reason, the work must be performed carefully, which causes a reduction in production efficiency and high costs.

  In order to suppress breakage during the mold release operation, for example, it may be possible to provide a plurality of eject pins on the lower mold and apply a force in a direction to move away from the lower mold substantially evenly. In this case, an increase in cost is inevitable. Also, if the protruding length of the protruding portion is shortened or the protruding portion is not provided on the lower mold, it will naturally be easy to work, but in this case, since the thickness of the thin portion increases, a large force is required for separation. It also leads to inducing cracks at unintended locations.

  Therefore, the present invention has been made to solve the above-mentioned problems, and while improving production efficiency and cost reduction, it is possible to suppress breakage at the time of mold release, and further, separation work is easy. The purpose is to provide ceramic end tabs.

  In order to solve the above-described problems, the ceramic end tab of the present invention is formed with slits 3 and 4 for separation on both sides by slit-forming projections 7a and 8a provided on a pair of molds 7 and 8 facing each other. The slit 3 formed on the side to be released later than the depth of the slit 4 formed on the side to be released first, of both sides where the slits 3 and 4 are formed. It is characterized in that the depth of is formed shallower.

  Moreover, it is preferable that the width | variety of the slits 3 and 4 is expanded as it goes outside. Furthermore, it is preferable that the degree of widening is larger in the slit 3 formed on the side to be released later than the slit 4 formed on the side to be released first.

  Moreover, the ceramic end tab may be comprised by the some end tab 2 being connected. In this case, the slits 3 and 4 are preferably provided between the individual end tabs 2. Moreover, it is preferable that it is substantially rectangular shape as a whole.

  Moreover, the slits 3 and 4 may be provided in the base material contact portion 2 c that is orthogonal to the welding groove 22 and contacts the base material 27. Furthermore, it is preferable that the thickness of the thin portion 10 formed between the slits 3 and 4 is 8 mm or less, and the depth of the slit 3 formed on the side to be released later is 8 mm or less.

  In the ceramic end tab of the present invention, the depth of the slit formed on the side to be released later is larger than the depth of the slit formed on the side to be released first, on both sides where the slit is formed. Since it is formed shallowly, the friction generated between the slit formed on the side to be released later and the protrusion of the mold corresponding to this slit was formed on the side to be released first. The friction between the slit and the projection of the mold corresponding to the slit is reduced, and the mold to be released later and the mold corresponding thereto can be easily released. Therefore, even in the state where the support of one mold is released, breakage during the mold release operation can be suppressed. At this time, if the thickness of the thin portion formed between the slits is made equal to that of the conventional one, the separation work will not be difficult.

  Moreover, since the width | variety of a slit is expanded as it goes outside, the friction which arises between a slit and a projection part can be made smaller. In particular, since the width of the slit formed on the side to be released later is larger than the slit formed on the side to be released earlier, the side to be released later And release from the corresponding mold can be performed more easily.

  Further, since the ceramic end tab is configured by connecting a plurality of end tabs, the cost can be reduced as compared with the case where the end tabs are manufactured one by one. Further, since the slits are provided between the individual end tabs, they can be easily divided and used at the time of use. In addition, since the ceramic end tab is generally rectangular, the packing efficiency is good and the shape of the mold is simplified.

In addition, since a slit is provided in the base material contact portion that is orthogonal to the weld groove provided between the base materials and contacts the base material, it can be separated along the slit according to the use location of the end tab. , Can increase versatility. Furthermore, the thickness of the thin part formed between the slits is 8 m.
Since it is set to m or less, it can be easily separated. Further, since the depth of the slit formed on the side to be released later is 8 mm or less, the side to be released later and the mold corresponding thereto can be easily released. it can.

It is a perspective view showing a ceramic end tab concerning one embodiment of this invention. It is a perspective view which shows the state which cut | disconnected the end tab along the slit. It is a perspective view which shows the use condition of an end tab. It is the schematic which shows the manufacturing process of a ceramic end tab. It is a side view which shows the protrusion part of an upper mold | type and a lower mold | type. It is a perspective view which shows the use condition of the ceramic end tab which concerns on different embodiment. It is a perspective view which similarly shows the ceramic end tab. It is a perspective view which shows the ceramic end tab concerning further different embodiment. It is sectional drawing which shows the separation state of a surplus part, and the attachment state to a welding location.

  Next, an embodiment of the ceramic end tab 1 of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the ceramic end tab 1 is formed by integrally forming two end tabs 2 and 2 and is formed into a plate shape having a substantially rectangular side surface as a whole. Slits 3 and 4 for separating the two end tabs 2 and 2 from each other are formed in a substantially central portion of the substantially rectangular side surface. Further, a stepped portion 2a is provided in a substantially V shape in a side view so as to connect the vicinity of the lower end of the slits 3 and 4 and the vicinity of the upper corner of the substantially rectangular side surface.

  Of the surfaces divided in a substantially triangular shape by the stepped portion 2a, one surface (the surface located in the upper part in the drawing) retreats inward from the other surface (the surface located in the lower part in the drawing). This retreating surface is a blocking portion 2 b that faces the end of the weld groove 22 formed between the base materials 20 and 21 and prevents leakage of weld metal from the weld groove 22. Further, the surface relatively projecting from the blocking portion 2 b is a base material abutting portion 2 c that is orthogonal to the welding groove 22 and abuts against the side surface of the base material 20. In use, the individual end tabs 2 and 2 are separated by folding along the slits 3 and 4 as shown in FIG. 2 and straddled between the different width base materials 20 and 21 as shown in FIG. The end of the weld groove 22 is blocked by the blocking portion 2b. In addition, the blocking part 2b and the base material contact part 2c are provided on both surfaces of the end tab 2, and the other can be used even after one is used.

  The ceramic end tab 1 having the above-described configuration is manufactured by putting a material into a mold 5 and press-molding it, followed by drying and firing.

  More specifically, as shown in FIG. 4A, the molding is performed by first putting a material such as alumina into the space formed by the horizontal mold 6 and the lower mold 7, and then FIG. 4B. The upper die 8 is moved toward the lower die 7 and pressure is applied to the material by the upper die 8 as shown in FIG.

  As shown in FIGS. 4 and 5, the upper die 8 and the lower die 7 that are opposed to each other are provided with protrusions 7 a and 8 a for forming slits 3 and 4, respectively. The lengths of the protrusions 7a and 8a are such that the protrusion length L1 of the protrusion 7a of the lower mold 7 is smaller than the protrusion length L2 of the protrusion 8a of the upper mold 8.

Both the protrusion 8a of the upper die 8 and the protrusion 7a of the lower die 7 have draft angles α and β (gradients provided so as to be tapered). The draft angle α is the upper die 8
This is larger than the draft angle β of the protruding portion 8a. More specifically, the base end side widths W1 and W2 and the tip end side widths W3 and W4 of the protrusions 7a and 8a are equal in the upper mold 8 and the lower mold 7, and the protrusions of the lower mold 7 are the same. In the case of 7a, the draft angle α is larger because the protrusion length L1 is shorter.

  Accordingly, in the molded body 9 formed by pressure molding the material, slits 3 and 4 are formed on the side (surface) facing the upper mold 8 and the lower mold 7 respectively. The slit 3 provided on the lower side during pressure molding is formed shallower than the slit 4 provided on the upper side during pressure molding. As will be described in detail later, since the upper die 8 is released before the lower die 7, the depth relationship between the slits 3 and 4 is that of the slit 4 formed on the side to be released first. In other words, the depth of the slit 3 formed on the side to be released later is formed shallower than the depth. In addition, the slits 3 and 4 are formed in a shape widened toward the outside by the drafts α and β of the protrusions 7a and 8a. The degree of this widening is on the lower side during pressure molding. The slit 3 provided is larger than the slit 4 provided on the upper side during pressure molding. In the degree of widening of the slits 3 and 4 as well, the slit formed on the side to be released later than the slit 4 formed on the side to be released first, similarly to the depth relation of the slits 3 and 4. In other words, it can be said that 3 is larger.

  After the material is sufficiently pressurized, it is then released. That is, the molded body 9 is removed from the mold 5, but the removal from the mold 5 is performed by first moving the upper mold 8 upward as shown in FIG. 4 (c). And the upper mold 8 are separated from each other. At this time, friction occurs between the protrusion 8a of the upper mold 8 and the slit 4 of the molded body 9, but as described above, the protrusion 8a is provided with the draft angle β, and the shape of the slit 4 is outside. Since it is made into the shape which expands as it goes to the direction, it can remove easily. Further, since the molded body 9 is still constrained by the horizontal mold 6, the possibility of breakage is very small.

  Next, as shown in FIG. 4D, the lower mold 7 is moved above the horizontal mold 6 to release the molded body 9 from the support of the horizontal mold 6. Then, the molded body 9 is removed from the lower mold 7 by grasping the side surface of the molded body 9. At this time, friction occurs between the protrusion 7a of the lower mold 7 and the slit 3 of the molded body 9, but the draft 7 is also provided in the protrusion 7a of the lower mold 7, and the shape of the slit 3 is outside. Since it is made into the shape which expands as it goes to the direction, it can remove easily. Further, since the draft angle α of the lower mold 7 is larger than the draft angle β of the upper mold 8, the friction generated between the protrusion 7 a and the slit 3 is small. Since the protruding length L1 of the protruding portion 7a is smaller than the protruding length L2 of the protruding portion 8a of the upper mold 8, the friction is further reduced and the removal is easier. Even if the support by the horizontal mold 6 is released, there is no need to perform the work particularly carefully. In addition, it is preferable that the depth of the slit 3 provided on the lower side during pressure molding is 8 mm or less in consideration of ease of removal.

  Further, the protruding length L2 of the protruding portion 8a of the upper mold 8 is increased by the amount by which the protruding length L1 of the protruding portion 7a of the lower mold 7 is shortened. The thickness is not different from the conventional one. Specifically, the thickness of the thin portion 10 is 8 mm or less. Accordingly, the force required to divide the two end tabs 2 and 2 into one piece is the same as that of the conventional one, and can be easily separated by hand force.

  As described above, in the ceramic end tab 1 having the above-described configuration, it is possible to easily remove the molded body 9 from the mold 5 while suppressing breakage of the molded body 9, thereby improving production efficiency and reducing costs. . Further, by making the thickness of the thin portion 10 the same as the conventional one, a large force is not required for separation. Furthermore, since the slits 3 and 4 are formed on both surfaces, cracks at unintended portions can be suppressed.

  Next, a ceramic end tab 1A manufactured in the same manner as the above manufacturing method but using a different mold will be described in detail with reference to FIGS.

  In welding the base materials 24, 25 having different thicknesses, the height of the end tab 2A may be adjusted to the thick plate 25 side, but if there is a large difference between the thickness of the thin plate 24 side and the height of the end tab 2A, When welding the end of the welding groove 23 (in the vicinity of the end tab 2A), there may be a problem that the welding torch contacts the end tab 2A. Moreover, it is uneconomical because extra materials are required.

  Therefore, as shown in FIG. 6, it is preferable to use an end tab 2 </ b> A having a substantially trapezoidal shape when viewed from the side and increasing in height toward the thick plate 25 side. As a result, the material can be reduced as compared with the end tab having a substantially square shape when viewed from the side, and the possibility that the welding torch contacts the end tab 2A is reduced. In addition, there is an advantage that the formation of surplus is easy.

  However, when such an inclination is provided, when the two end tabs 2A and 2A are connected so as to be symmetrical with respect to the slits 3 and 4 as in the ceramic end tab 1 of the above-described embodiment, The entire shape becomes a letter shape in a side view, so that the packing efficiency is lowered and the shape of the mold becomes complicated.

  Therefore, in the state where the blocking portion 2b and the base material contact portion 2c are viewed from the front, the end tabs 2A and 2A are slits 3, As shown in FIG. 7, the ceramic end tab 1 </ b> A has a generally rectangular shape as viewed from the side. In this state, it can be said that the slits 3 and 4 are provided to be inclined with respect to the sides constituting the outer shape of the ceramic end tab 1A.

  By configuring in this way, there is no gap when packing, despite the fact that the end tab 2A has a substantially trapezoidal shape when viewed from the side, the packing efficiency is good, and the mold shape is simplified.

  Also in the ceramic end tab 1A of the present embodiment, the protrusion length L1 of the protrusion 7a of the lower mold 7 is formed shorter than the protrusion length L2 of the protrusion 8a of the upper mold 8, and both protrusions Since the drafts α and β are provided in the portions 3 and 4, and the draft angle α of the projection 7 a of the lower mold 7 is larger than the draft slope β of the projection 8 a of the upper mold 8. The same effects as the ceramic end tab 1 of the above embodiment are exhibited.

  Next, a ceramic end tab 1B which is the same method as the above manufacturing method but is manufactured using a different mold will be described.

  As shown in FIG. 8, the ceramic end tab 1B has slits 3 and 4 formed along the step portion 2a in addition to the slits 3 and 4 provided between the two end tabs 2B and 2B. It is different from the ceramic end tabs 1 and 1A of the above-described embodiment in that the shape can be changed according to the use location (the surplus portion 11 can be separated).

The ceramic end tab 1B having the above configuration is used as it is without separating the surplus portion 11 in the situation shown in FIG. By using in this way, the end tab 2 </ b> B can be stably placed on the backing metal 23. In addition, since the slits 3 and 4 are provided in the base material abutting portion 2c that abuts the base material 20 instead of the blocking portion 2b that blocks the weld metal, the weld metal enters the slits 3 and 4. The same feeling of use as that of the end tabs 2 and 2A of the above-described embodiment can be obtained without causing such problems.

  The surplus portion 11 is cut off when, for example, the inner diaphragm 27 is welded to the prism 26 as shown in FIG. The inner diaphragm 27 is generally formed with a cutout 27a so as to avoid the corner portion (curved surface portion) of the prism 26, but even if an end tab 2B is to be installed in the cutout 27a, the surplus portion 11 becomes an obstacle. It is often impossible to install. Therefore, the surplus portion 11 is cut off and the shape thereof is set to be a substantially triangular shape when viewed from the side, so that it is installed in the notch 27a. As described above, since the slits 3 and 4 are provided in the base material contact portion 2c, the weld metal does not leak from the weld groove 22 even if the surplus portion 11 is cut off.

  Thus, by making the surplus part 11 separable, it can be used for various places and a commercial value can be raised. Further, the material can be reduced by the amount of the slits 3 and 4 provided, and the cost can be reduced. In particular, if the drafts α and β of the slits 3 and 4 provided in the base material contact portion 2c are increased, a greater reduction effect can be obtained.

  In addition to the slits 3 and 4 provided between the end tabs 2B and 2B, the slits 3 and 4 provided in the base material contact portion 2c are configured in the same manner as in the above-described embodiment. Although the same effect as the embodiment is achieved, the present invention is particularly effective when a plurality of slits 3 and 4 are provided as described above. In other words, the more slits 3 and 4 are provided, the more fragile it becomes and the release work must be carefully performed, but according to the above configuration, even when a plurality of slits 3 and 4 are formed, There is no need to work carefully.

  As mentioned above, although typical embodiment of this invention was described, this invention is not limited to the said embodiment, It can be implemented in various changes within the scope of this invention.

  For example, in the above embodiment, the upper mold 8 is released first, and then the lower mold 7 is released. However, the lower mold 7 is first released, and then the upper mold 8 is released. You may make it do. In this case, the protruding length L2 of the protruding portion 8a of the upper mold 8 which is the side to be released later is set to be smaller than the protruding length L1 of the protruding portion 7a of the lower mold 7 which is the side to be released first. The depth of the slit formed on the side to be released later is made shallower than the depth of the slit formed on the side to be released. In accordance with this, the degree of widening is set so that the slit formed on the side to be released later is larger than the slit formed on the side to be released earlier. By configuring in this way, even when the top and bottom are inverted, the same operational effects as the above-described embodiment are obtained. In addition, this invention is applicable not only to the upper and lower sides but when a pair of metal mold | die which mutually opposes is provided in the left-right direction.

  Moreover, in the said Example, when connecting end tabs, although the side used as an upper surface was connected at the time of use, which surface will be connected if it is a surface which does not contact | abut to a base material or backing metal. You may do it. Further, the number of end tabs to be connected is not limited to two and can be changed as appropriate. Moreover, if the slits 3 and 4 are formed in the base material contact part 2c, it is not necessary to connect a plurality of end tabs. Moreover, as a location which provides the slits 3 and 4, it is not restricted to between end tabs or the base material contact part 2c. Further, the number can be changed as appropriate. In the above embodiment, for example, as shown in FIG. 5, the drafts α and β are provided so as to be bilaterally symmetric. However, different values may be used on the left and right.

1..Ceramic end tab, 2..End tab, 3, 4 .... Slit, 7..Lower mold, 7a..Lower mold projection, 8..Upper mold, 8a..Upper mold projection, 10 ..・ Thin part, 22 ・ ・
Weld groove, 27 .. Inner diaphragm (base material)

Claims (8)

A ceramic end tab in which slits (3) and (4) for separation are formed on both sides by slit-forming projections (7a) and (8a) provided on a pair of molds (7) and (8) facing each other. There,
On both sides, a blocking portion (2b) that prevents leakage of weld metal from the welding groove (22), and a base material contact that protrudes further toward the base material side than the blocking portion (2b) and contacts the base material Each part (2c),
Of the both sides where the slits (3) and (4) are formed, the slit (3) formed on the side to be released later than the depth of the slit (4) formed on the side to be released first. A ceramic end tab characterized in that the depth is shallower. The center between the deepest part of a slit (3) (4) is shifted | deviated to the slit (3) side from the center of the plate | board thickness direction of a ceramic end tab over the full length of a slit (3) (4) . Ceramic end tab. The ceramic end tab according to claim 1 or 2 , wherein the width of the slit (3) (4) is increased as it goes outward. The degree of widening, according to claim 3 towards the slit formed in the side to be demolded even after the slit formed on the side that is releasing the previously (4) (3) there is a large Ceramic end tab. By multiple end-tab (2) is connected, the ceramic end tabs are configured, a slit (3) (4), any of claims 1 to 4 is provided between the individual end tabs (2) A ceramic end tab according to crab. The ceramic end tab according to claim 5 , wherein the ceramic end tab has a substantially rectangular shape as a whole. The ceramic according to any one of claims 1 to 6 , wherein a slit (3) (4) is formed in a base material contact portion (2c) orthogonal to the weld groove (22) and in contact with the base material (27). End tab. The thickness of the thin part (10) formed between the slits (3) and (4) is 8 mm or less, and the depth of the slit (3) formed on the side to be released later is 8 mm or less. Item 8. The ceramic end tab according to any one of Items 1 to 7 .