JPH0441972Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an enamel paint application roll, and more specifically, to an application roll used for applying enamel paint to a wire in an enameled wire manufacturing device.

(Prior Art) First, an enamelled wire manufacturing apparatus will be outlined with reference to FIGS. 5 and 6.

As shown in FIG. 5, the wire rod w is coated with enamel paint in a coating device indicated by the reference numeral 1, passes through a baking step ₂ , where a first layer of coating film is formed by baking, and the wire rod is coated with guide rollers. It enters the coating device 1 again via the circulation path, where it receives the second coating of paint, and then enters the baking path 2 again, where it receives the second coating.
The layers are baked, and the process of coating and baking is usually repeated a dozen times to produce an enameled wire with the desired coating thickness.

As shown in FIG. 6, which is an enlarged detailed drawing, the coating device 1 includes a coating roll 3 that is rotated while being immersed in enamel paint stored in a paint tank 6, and a coating roll 3. 3, the wire w is sandwiched between tension-applying felts 4 and given appropriate tension, and the wire w is coated with enamel paint by the applicator roll 3. The excess paint is wiped off with a squeezing felt 5 and directed to the baking furnace 2.

A conventional applicator roll 3 used for applying enamel paint has n coating grooves G ₁ , G ₂ , G ₃ , . . _. Go formed on its outer peripheral surface, as shown in Fig. 3. , and each of these grooves all has the same cross-sectional area S ₁
and are located corresponding to each route of the wire circulation path of the enamelled wire manufacturing apparatus shown in FIG. Wire rod w
When the coating roller 3 travels through this groove, the paint that is carried from the paint tank 6 and adheres to the inner surface of the groove is applied as the coating roll 3 rotates. However, the first groove
When traveling in G ₁ , the first coating, that is, the coating for the first layer, is performed, and the second groove G ₂ , the third groove G ₃ ,
...Sequentially running through the n-th groove G _o to the second layer,
Coating for the third layer and the nth (final) layer is performed.

Here, the enamel coating amount Q ₁ for the first layer coating film is determined in relation to the compatibility between the surface of the wire rod w and the enamel paint used, and is The amount is selected to form the maximum thickness with excellent coating properties and little variation in outer diameter, that is, the so-called critical coating thickness _t1 . Generally, the amount of coating applied by the grooves of the applicator roll is proportional to the product of the cross-sectional area of the groove and the rotational speed of the applicator roll, so the rotational speed of the applicator roll 3 and the cross-sectional area of the groove are It is set to give a coating amount Q ₁ to obtain a critical coating thickness t ₁ of the layer.

By the way, in the second and subsequent coating films, the first
Since the paint is applied on top of the paint film, unlike the paint film in the second layer, the so-called conformability is considerably improved, and for this reason, the critical film thickness for the second and subsequent layers is the same as that of the first layer. This value is considerably larger than the critical coating thickness _t1 .

(Problems to be solved by the invention) However, in the conventional application roll, the second
As shown in FIG. 3, the groove G ₂ , the third groove G ₃ , ..., the n-th groove G _o all have the same cross-sectional area S ₁ as the first groove G ₁
and since these are rotated integrally, the amount of coating for the second and subsequent layers is
Q ₂ , Q ₃ , ..., Q _o are all coating amounts of the first layer Q ₁
Therefore, the second amount shown in Figure 4 is the same as
Not only does the amount of coating film after the layer t ₂ , t ₃ , ... t _o not reach the critical coating thickness of each layer, but also considering the substantial increase in the outer diameter of the wire w due to coating film formation. If this is done, the coating thicknesses t ₂ , t ₃ , ..., t _o of the second and subsequent layers will be sequentially lower than the coating thickness of the previous layer, that is, the layer immediately below, and as a result, the final desired total In order to obtain a coating film thickness (predetermined finished coating thickness), the number of coating layers must be increased, that is, the number of coatings must be increased, resulting in a significant decrease in production efficiency.

(Means for solving the problem) This idea was made to solve the above problem, and the second and subsequent layers are applied according to the compatibility between the paint film and the enamel paint. The gist is a coating roll that increases the amount of
Specifically, in an enamel paint application roll in an enameled wire manufacturing apparatus, which has a cylindrical shape and has n parallel paint application grooves extending in the circumferential direction on its outer peripheral surface, the cross-sectional area of the second groove is With respect to the cross-sectional area of one groove, the compatibility between the coating film and the enamel paint increases compared to the compatibility between the wire surface and the paint, and the Each cross-sectional area up to the groove is made to correspond to the substantial outer diameter of the wire, which increases each time a coating film is formed, with respect to each cross-sectional area from the second groove immediately before them to the (n-1) groove. This is an enlarged enamel paint application roll.

(Function) The cross-sectional area of the second groove of the applicator roll is larger than the cross-sectional area of the first groove because the compatibility between the coating film and the paint has increased compared to the compatibility between the wire surface and the paint. Furthermore, the cross-sectional area of each groove after the third groove is increased corresponding to the substantial outer diameter of the wire, which becomes larger each time a coating film is formed, than the cross-sectional area of the groove immediately before it. During application of the enamel paint, each layer of the paint film forms a critical film thickness, so that an enameled wire having a predetermined finished film thickness can be obtained by minimizing the number of times of application.

(Example) An example of this invention will be described with reference to FIG. The applicator roll 3 of this invention also has a first groove.
The cross-sectional area S ₁ of G ₁ is set to a size that can supply the coating amount Q ₁ that makes the first layer coating film have the critical coating thickness t ₁ , as in the conventional coating roll shown in FIG. Selected.

Next, the cross-sectional area _S2 of the second groove _G2 is the cross-sectional area of the first groove _G1 .
From _S1 , the compatibility between the enamel paint and the coating film is increased in proportion to the increase in the compatibility between the enamel paint and the surface of the wire w. Furthermore, the third groove G ₃ , the fourth groove G ₄ , ..., the n-th groove
The cross-sectional areas S ₃ , S ₄ , ..., S _o of G _o are the second grooves, respectively.
G ₂ , the third groove G ₃ , ..., the cross-sectional area of the (n-1)th groove G _o-1 increases more practically than the S ₂ , S ₃ , S _o-1 each time the coating film is formed. It gradually increases in accordance with the diameter. By doing so, the coating thickness of each layer can be set to the respective critical coating thickness.

Figure 2 shows a cross-section of an enameled wire manufactured using the coating roll of this invention, in which each coating film from the second layer onwards has the same thickness, t ₂ = t ₃ =...=t _o. It has a critical coating thickness of .

(Effect of the invention) According to this invention, the cross-sectional area of the second groove of the applicator roll has a better compatibility between the coating film and the paint than the cross-sectional area of the first groove. In addition, the cross-sectional area of each groove after the third groove is increased by the outer diameter of the wire, which increases substantially with each coating film formed, compared to the cross-sectional area of the immediately preceding groove. Since the coating of each layer is correspondingly increased, the critical coating thickness of the respective layer is reached, so that an enameled wire with a given finished coating thickness can be obtained with a minimum number of coats, and the enameled wire The manufacturing efficiency can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an embodiment of an enamel coating roll according to this invention, FIG. 2 is an enlarged sectional view showing an enameled wire manufactured using the coating roll of FIG. 1, and FIG. The figure is a partially cutaway side view showing a conventional applicator roll, Figure 4 is an enlarged sectional view showing an enameled wire manufactured using the applicator roll of Figure 3, and Figure 5 is a simplified side view showing enameled wire manufacturing equipment. 6 is an enlarged side view showing the paint coating device portion in FIG. 5. In the figure, 3 is a coating roll, G ₁ , G ₂ , G ₃ ,
...G _o is the first, second, third, ...
The n-th groove, S ₁ , S ₂ , S ₃ , . . . S _o is the cross-sectional area of the first, second, third, . . . n-th groove.

Claims (1)

[Scope of utility model registration request] In an enamel paint application roll in an enameled wire manufacturing device, which has a cylindrical shape and has n parallel paint application grooves extending in the circumferential direction on its outer peripheral surface, the cross-sectional area S ₂ of the second groove G ₂ is Cross-sectional area of 1 groove G ₁ S ₁
On the other hand, the compatibility between the coating film and the enamel paint increases in proportion to the increase in the compatibility between the surface of the wire w and the paint, and the third groove
Each cross-sectional area from G ₃ to the n-th groove G _o is S ₃ , S ₄ , ...,
_So , each cross-sectional area S 2 , S _{3 ,} ..., from the second groove G ₂ immediately before them to the (n-1)th groove G _o-1 respectively
An enamel paint application roll that is larger than S _o-1 to correspond to the substantial outer diameter of the wire, which increases each time a coating film is formed.