JP4644059B2 - Application head - Google Patents

Description

  The present invention relates to a coating head that forms a coating film on the surface of an object to be coated.

  For example, in the process of manufacturing liquid crystal substrates, magnetic tapes, vinyl sheets, foam sheets, etc., coating films such as liquid crystal materials, magnetic materials, coating liquids, and molten resins are formed on the surface of substrates, strips, etc. There is a process to do. For forming such a coating film, a coating apparatus having a coating head for discharging a coating solution is used.

  Generally, a coating apparatus forms a uniform coating film on the surface of an object to be coated by causing a coating head having a slit to move relative to the surface of the object to be moved and discharging the coating liquid from the slit. In the coating head, a space that communicates with the slit and stores the coating liquid is formed inside, and the coating liquid supplied to the space is discharged through the slit (see, for example, Patent Document 1). .

  The coating head of Patent Document 1 is composed of a lip member that discharges the coating liquid and a head member that supports the lip member at the tip, and by arranging the three lip members facing each other at a predetermined interval, A coating solution can be applied in layers on the surface of an object to be coated. Here, the head member is formed of a steel material such as stainless steel, whereas the lip member is formed of a cemented carbide, improving the wear resistance of the lip tip and improving the separation of the coating liquid, A uniform film layer is formed.

  In addition, in the coating head that discharges the magnetic paint, the lip member of the discharge portion disposed to be opposed is formed of precipitation hardening stainless steel in order to improve the wettability of the magnetic paint and to spread the discharged paint. A technique has been proposed (see Patent Document 2).

JP 2004-66016 A (2nd page, FIG. 2) JP 2001-155335 A (page 4)

  However, since the lip member of Patent Document 1 is formed of a cemented carbide, it is excellent in wear resistance and corrosion resistance. However, in addition to being expensive, there is a limit to the size that can be processed when HIP processing or the like is performed. In order to form a long object in the longitudinal direction, the lip members must be melt-bonded to each other, and if a pinhole or the like is generated at the joint, for example, a defect such as a streak may be caused in the coating film. Further, when the lip member is fixed to the head member, for example, it is necessary to braze the clamp piece to the lip member and to fix the clamp piece to the head member via the clamp piece, which increases the number of processing steps.

  On the other hand, since the head member of Patent Document 2 is formed of precipitation hardening stainless steel, in addition to being inexpensive, it is excellent in corrosion resistance and workability and facilitates processing of a long object. However, there is a problem in wear resistance because the hardness is greatly reduced compared to cemented carbide. Moreover, since the directionality on structure | tissue by forging etc. arises, there exists a possibility that a thermal strain may arise during each processing process and using it as a product.

  An object of the present invention is to provide a lip member that is small in wear and thermal strain and excellent in corrosion resistance and workability.

  In order to solve the above-described problems, the present invention provides a head member that is disposed to face an object to be coated, and is supported by extending in the longitudinal direction of the head member, with a gap between each other. A plurality of lip members forming a flow path, wherein the lip members are C: 0.6% to 3.0%, Cr: 11.5% to 30.0%, and V: 1. It contains 0% to 10.0%, Si: 2.0% or less, Mn: 2.0% or less, and the balance is formed of powder stainless steel of Fe and inevitable impurities.

  Since the lip member formed in this manner has no structural directionality unlike melted stainless steel, thermal strain is suppressed and deformation in processing can be suppressed. In the present invention, the stainless steel powder is based on the chemical composition of martensitic SUS440C, and this composition is improved to increase the amount of C and newly add V for improving wear resistance. Is used. Furthermore, since the hardness can be kept low at 15-20 HRC by annealing treatment after sintering, machining becomes easy, and in addition, the hardness can be increased to 58-67 HRC after heat treatment. Can be improved. Moreover, when fixing to a head member, the brazing process is not required but it can fix with a volt | bolt etc.

  Specifically, the lip member is configured such that a bolt inserted into the head member is screwed and fixed to the head member by a tensile force of the bolt. Thus, since the lip member has good workability before heat treatment, it is possible to directly form tapped holes and to be fastened with bolts.

  The present invention also includes a front head member and a rear head member that are arranged to face an object to be coated, and extended to the longitudinal edge of each head member, and are spaced apart from each other. The front lip member and the rear lip member that form the flow path are formed, and the front head member, the front lip member, the rear head member, and the rear lip member are integrally formed, and by weight%, C: 0.6 %: 3.0%, Cr: 11.5% to 30.0%, V: 1.0% to 10.0%, Si: 2.0% or less, Mn: 2.0% or less, the balance May be formed of powdered stainless steel of Fe and inevitable impurities.

  According to the present invention, it is possible to provide a lip member that is low in wear and thermal strain and excellent in corrosion resistance and workability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a main part of a coating head according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a main part of a coating apparatus.

  As shown in FIG. 2, the coating apparatus to which the coating head according to the present invention is applied is coated on the coating head 3 disposed facing the base material 1 of the object to be coated and the liquid reservoir chamber 5 of the coating head 3. A supply device for supplying the liquid and a moving device for moving the coating head 3 relative to the base material 1 in the coating direction 7 indicated by the arrow are configured.

  As shown in FIG. 1, the coating head 3 includes a pair of front head 10 and rear head 12 and is formed with a longitudinal direction corresponding to the coating width of the base material 1. Here, the front end portions of the front head 10 and the rear head 12 (downward in the figure) are provided to face each other with a space therebetween.

  In the rear head 12, a groove 15 having a semicircular cross section extending in the longitudinal direction is formed on a surface facing the front head 10, and a liquid reservoir chamber 5 is formed in a space surrounded by the groove 15 and the front head 10. Is formed. The liquid reservoir chamber 5 is a part of the flow path of the coating liquid, and the coating liquid is supplied from a supply device (not shown). In addition, a slit 13 is formed on the opposing surface of the front head 10 and the rear head 12 from the liquid reservoir chamber 5 to the front end portion by retreating the rear head 12 with respect to the front head 10 by one step. That is, the coating liquid supplied from the liquid reservoir chamber 5 is applied via the slit 13.

  The front head 10 and the rear head 12 are configured by attaching lip members 17 and 19 to the front ends of the front head member 9 and the rear head member 11, respectively. The lip members 17 and 19 have slits 13 extending toward the front end portions. As formed, they are supported facing each other at a distance. Here, the front head member 9 and the lip member 17 and the rear head member 11 and the lip member 19 are continuously formed so as to be flush with each other toward the slit 13 side.

  The lip member 17 is attached with the surfaces 21 and 23 extending in the longitudinal direction in contact with the opposing surfaces of the front head member 9. Similarly, the lip member 19 has the surfaces 21 and 23 facing the rear head member 11. It is attached in contact with the surface. A tapped hole into which the bolts 25 are combined with a predetermined interval in the longitudinal direction is formed in the ridge line portion where the surfaces 21 and 23 intersect.

  On the other hand, the front head member 9 is provided with a through hole from the outer surface to a space portion to which the lip member 17 is attached. Similarly, the rear head member 11 is provided with a through hole to a space portion to which the lip member 19 is attached. Yes. Bolts 25 are inserted into the through holes, and the ends of the bolts 25 are screwed into the tap holes of the lip members 17 and 19. Thus, by screwing the bolt 25 and pulling the lip members 17, 19, the lip members 17, 19 are pressed and fixed evenly against the surfaces of the front head member 9 and the rear head member 11. Deflection due to the tensile force of can be suppressed. Note that the direction in which the tensile force of the bolt 25 is generated, that is, the angle of the tap hole is appropriately set so that the tensile force of the bolt 25 is almost evenly applied to the surfaces 21 and 23 of the lip members 17 and 19. It is desirable to do. Thereby, the bending of the lip members 17 and 19 can be further suppressed, and the gap of the slit 13 can be kept uniform. Moreover, according to this embodiment, the flow of the coating liquid is not disturbed, and the stability of the coating performance can be improved.

  Next, the configuration of the lip members 17 and 19 will be described in detail. First, in order to clarify the effect of this embodiment, a conventional lip member will be examined.

  Conventionally, a cemented carbide having excellent wear resistance has been used in order to suppress the wear of the lip member and minimize the decrease in coating performance. However, since this member cannot be directly tapped due to the material, for example, it is necessary to braze a clamp piece on the lip member and fasten the bolt to the head member via the clamp piece and fix it. Become. Therefore, for example, a bimetal phenomenon may occur between the cemented carbide and the brazed portion and between the clamp piece and the head member due to a difference in coefficient of thermal expansion due to a temperature change during use. In particular, in the case of a long coating head, a cooling mechanism is required to suppress this phenomenon. Moreover, since it is weak to an impact, there exists a problem that a crack and a crack are easy to produce.

  On the other hand, it has been attempted to manufacture an integrated head made of various molten stainless steels that balance corrosion resistance and wear resistance. According to this, the bimetallic phenomenon can be avoided because of the integral type. However, since the hardness is not sufficient, such as about 50 HRC, in addition to a decrease in wear resistance, it is easy to generate hitting due to a collision, and furthermore, the directionality on the structure due to forging or the like occurs, so the thermal strain is large. There is a problem of becoming.

  On the other hand, the lip members 17 and 19 of the present embodiment are made of powdered stainless steel. The chemical composition of the powder stainless steel is, by weight, C: 0.6% to 3.0% (preferably 0.9% to 2.6%), Cr: 11.5% to 30.0% ( Preferably, 13.0% to 20.0%), V: 1.0% to 10.0% (preferably 2.0 to 6.0%), Si: 2.0% or less, Mn: 2 0.0% or less, and the balance is composed of Fe and inevitable impurities. The lip members 17 and 19 made of powdered stainless steel are sintered with stainless steel powder (martensitic stainless steel), then hot-worked (forged, rolled, etc.) and annealed to have a hardness of, for example, 15 to 20 HRC. Then, after being machined into a predetermined shape, quenching, sub-zero treatment, and tempering are performed, followed by grinding.

  The lip member formed in this manner has almost no directionality on the structure unlike stainless steel by conventional melting, so that thermal strain can be suppressed and deformation in processing can be suppressed. Moreover, in this embodiment, the stainless steel powder is based on the chemical composition of martensitic SUS440C, the composition is improved, the amount of C is increased, and V is newly added to a maximum of around 3%. Powder is used. For this reason, it has corrosion resistance at low cost (for example, material cost is 1/3 of cemented carbide), and the hardness after heat treatment (for example, 57 to 67 HRC) is made higher than that of the melted SUS material. Abrasion can be improved. That is, in the case of a melted material, if there is a large amount of V effective in wear resistance, processing such as forging becomes difficult, so the amount of addition of V is limited. For this reason, although it becomes a thing with low abrasion resistance, in the stainless steel of this embodiment, since the sintering method using powder is adopted, V is added more than in the case of melted stainless steel. Wear resistance can be further increased. In particular, when applying a liquid crystal material to a liquid crystal substrate, there is no contact with the base material, and unlike magnetic paints, no hard materials are added to the paint, so hardness up to cemented carbide If the hardness and wear resistance of the present embodiment are sufficient, the coating head can be sufficiently applied.

  In addition, according to the present embodiment, the hardness is low before quenching (for example, 15 to 20 HRC), and tapping is facilitated. Therefore, when the lip members 17 and 19 are fixed to the head member, brazing or the like is performed. Even if not applied, it can be attached with bolts. Therefore, the bimetal phenomenon can be suppressed. Moreover, since the mirror surface property is further improved due to the high hardness, for example, the surface quality of the slit surface 13 and the tip of the lip can be kept good, and the fluidity of the coating liquid can be kept uniform. For example, the front head member 9 and the rear head member 11 may be made of SUS420, which is a molten material.

  Next, another embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view of a main part of a coating head according to another embodiment of the present invention.

  In the embodiment of FIG. 1, the configuration in which one slit 13 is formed by the front head 10 and the rear head 12 has been described. However, in the present embodiment, the central head 36 is sandwiched between the front head 32 and the rear head 34. An example of forming two slits will be described. The description of the same configuration as that of the embodiment shown in FIG. 1 is omitted.

  As shown in the figure, the coating head of the present embodiment is configured by sequentially arranging a front head 32, a central head 36, and a rear head 34 in the coating direction 7 with an interval therebetween. Lip members 37, 39, and 41 are attached to the tip portions of the head members 31, 35, and 33 along the longitudinal direction. On the surface where the front head 32 and the rear head 34 face the central head 36, grooves 43 and 45 having a semicircular cross section extending in the longitudinal direction are formed and surrounded by the groove 43 and the central head 36. The liquid reservoir chamber 47 and the liquid reservoir chamber 49 formed by being surrounded by the groove 45 and the central head 36 are part of the flow path of the coating liquid. From the liquid reservoir chambers 47 and 49 to the front end portion, the front head 32 and the rear head 34 are respectively retracted by one step with respect to the central head 36, whereby slits 51 and 53 are formed. That is, as in FIG. 1, the coating liquid supplied to the liquid storage chambers 47 and 49 is applied via the slits 51 and 53.

  On the other hand, the front head member 31, the center head member 35, and the rear head member 33 are each provided with a through hole from the outer surface to the front end portion, and the front ends of the bolts 55, 57, 59 inserted into the through holes are connected to the lip member. The lip members 37, 39, 41 are pressed and fixed to the front head member 31, the center head member 35, and the rear head member 33, respectively, by being screwed into the tap holes of 37, 39, 41.

  Also in this embodiment, the lip members 37, 39, and 41 can be formed of powdered stainless steel having the same composition as the lip members 17 and 19 in FIG. 1, thereby producing the same effects as in the above embodiment. be able to.

  As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to the said embodiment, A various deformation | transformation can be performed. For example, each head member and the lip member at the tip thereof may be integrally formed of powdered stainless steel. This has the advantage that the number of parts is reduced and the structure is simplified.

  Furthermore, in this powder stainless steel, if the hardness before and after heat treatment, wear resistance after heat treatment, corrosion resistance, specularity, manufacturing cost, etc. are at the same level as the lip member of the present invention, powders of other compositions are used. Needless to say.

It is sectional drawing of the principal part of the coating head of one Embodiment which concerns on this invention. It is a perspective view which shows the principal part of the coating device containing the coating head of one Embodiment which concerns on this invention. It is sectional drawing of the principal part of the coating head of other embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 3 Application | coating head 5 Liquid reservoir chamber 9 Front head member 10 Front head 11 Rear head member 12 Rear head 13 Slit 17, 19 Lip member 25 Bolt

Claims (3)

A head member disposed opposite to an object to be coated, and a plurality of lip members which are supported by extending along the longitudinal edge of the head member and form a flow path for the coating liquid with a gap therebetween. Prepared,
The lip member is, by weight, C: 0.6% to 3.0%, Cr: 11.5% to 30.0%, V: 1.0% to 10.0%, Si: 2.0 %, Mn: 2.0% or less, the balance being formed of Fe and inevitable impurities powdered stainless steel. 2. The coating head according to claim 1, wherein a bolt inserted into the head member is screwed to the lip member, and the lip member is fixed to the head member by a tensile force of the bolt. A front head member and a rear head member that are arranged to face an object to be coated, and are formed so as to extend to the edge in the longitudinal direction of each head member to form a flow path for the coating liquid with a space between each other. A front lip member and a rear lip member,
The front head member, the front lip member, the rear head member, and the rear lip member are integrally formed, and by weight, C: 0.6% to 3.0%, Cr: 11.5% ~ 30.0%, V: 1.0% ~ 10.0%, Si: 2.0% or less, Mn: 2.0% or less, the balance is made of powder stainless steel with Fe and inevitable impurities An application head characterized by.

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