JP2007054892A - Form rolling method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a form rolling method and a form rolling apparatus by which troubles such as the deterioration of function and discontinuity of a heating wire are prevented since the heating part of a preheating plug is not brought into contact with a plug hole when the plug is mounted onto the plug hole in the case of the preheating plug for diesel engines by preventing occurrence of eccentricity on a worked screw by deflection of a half-finished products in the form rolling (threading) process. <P>SOLUTION: When performing the form rolling stage for working a screw by using a roll die or a flat die in the portion excepting the head part of the half-finished products the head part of which is formed by working it into a hexagon after enlarging the diameter of the upper end part of a base stock which is cut into a fixed length, a guide stage for preventing the deflection of the half-finished products in the screw cutting stage and the occurrence of the eccentricity on the worked screw by supporting the rest portion excepting the portion where the screw is worked by being pressed with the die in the above half-finished products by any of a roll guide, a flat guide or a pipe guide is furthermore included. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rolling process method and apparatus, and more specifically, a thread is processed into a part of a semi-finished product to obtain a preheat plug or a long bolt used for a diesel engine. The present invention relates to a rolling method and apparatus for greatly improving quality and durability by preventing occurrence of eccentricity.

  In general, when a diesel engine is operated when the engine is cooled, as well as when the temperature of the outside air is low, the compression heat of the air is absorbed by the cylinder and the cylinder head, and the fuel does not ignite quickly. A preheating device that preheats and supplies the fuel to the combustion chamber is used. As such a preheating device, a heating wire is fixedly attached inside, and an engine head plug hole is provided on the outer peripheral surface of the upper end portion. There is a preheating plug in which a screw to be fastened is rolled.

  However, conventionally, when a screw is rolled into a preheat plug, generally, a pressure is applied with only a part of the upper end of a threaded portion of a semi-finished product between a pair of roll dies or a pair of flat dies.・ Rolled and processed, but when rolling the screws in this way, only the upper end, which is only a part of the total length of the semi-finished product, is pressed by the die and the other parts are supported. Since it was processed in a state where it was not, the semi-finished product was shaken during the processing process, resulting in eccentricity of the processed screw.

  Therefore, even if the runout or eccentricity is slight, the processed state of the screw is deteriorated, so that the preheating plug (1) is in a normal state in the plug hole (2) of the engine head as shown in FIG. 1a. As shown in FIG. 1b, it cannot be mounted, and is mounted eccentrically, so that the phenomenon that the heating element (1a) of the preheating plug comes into contact with the plug hole has occurred. The temperature control function of the control heating wire (1b) built in the heating element is deteriorated and the temperature rise of the heating heat wire (1c) becomes uncontrollable. Troubles such as disconnection of the respective hot wires (1b) and (1c) occur, and at the same time, there are problems such as a decrease in quality and durability as well as a shortening of the service life when severe.

  In addition to the preheating plug as described above, when a long bolt or the like is manufactured, a normal combination with the nut becomes defective due to the eccentric processing of the screw, resulting in product defects that cannot be used. There were also problems such as.

  The present invention was invented to solve the problems of the conventional rolling process as described above, and its purpose is to prevent the occurrence of defects in the processed screw, as well as to improve the quality and durability. It is to provide a rolling process method and apparatus that can be greatly improved.

  Such an object of the present invention is to perform processing in a state where the semi-finished product is stably supported so as not to cause run-out and eccentricity when rolling a screw to obtain a preheating plug or a long bolt. This method and apparatus can be achieved by providing a rolling processing method and apparatus. The manufacturing method and apparatus include a cutting step for cutting a material into a predetermined length, and a planar processing step for processing both cross sections of the cut material into a flat surface. Then, pressurize the upper end of the material to increase the diameter and then process it into a hexagonal shape. The semi-finished product obtained through the processing step of the head is a screw that is processed directly below the head. When performing the manufacturing stage, the remaining parts except for the part where the screw on the lower side is processed are supported by the guide, so that the semi-finished product does not shake or the processed screw is not eccentric in the rolling stage. The support stage to That comprise is obtained by it said.

  Therefore, according to the rolling processing method and apparatus according to the present invention, the semi-finished product is supported by the guide so that the semi-finished product is not shaken or the processed screw is not eccentric at the rolling stage of processing the screw. In particular, in the case of a preheating plug, when the preheating plug is installed in the plug hole of the engine head, the heating element of the preheating plug does not come into contact with the plug hole. In addition to being able to eliminate the conventional problems and at the same time obtain a product with greatly improved quality and durability, in the case of long bolts, the processed screw is not eccentric, so it is always correctly combined with the nut. There is an advantage that the occurrence of defects can be prevented.

Hereinafter, a rolling method and apparatus according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 2 is a manufacturing process diagram of a diesel engine preheating plug to which a rolling processing method and apparatus according to an embodiment of the present invention is applied. FIGS. 3a to 3c show a roll die for performing a rolling stage in the manufacturing process. FIG. 4A to FIG. 4C are schematic diagrams schematically showing different embodiments of a flat die and a flat guide performing a rolling step in the same manufacturing process. FIG.

  When applying the rolling processing method and apparatus according to the embodiment of the present invention to a manufacturing process of a preheating plug for a diesel engine, a plane for processing both cross sections of a material cut by a cutting step of cutting to a certain length into a plane. Processing stage, processing stage of the head part (10a) that is processed into a hexagon after increasing the diameter so that the head part can be formed by pressurizing the upper end part of the raw material, and penetrates from the head part to the lower end. When rolling a screw using a die (20) to the upper part (11) just below the head part of the semi-finished product (10) obtained through the punching step for machining the through-hole, The remaining part (12) excluding the upper part further includes a guide stage supported by a guide (30) so that the product does not sway or become eccentric.

  As the dice (20), a pair of roll dies (21) and flat dies (22) are used. When the roll dies (21) are used, a pair of roll guides (31) is used as the guide (30). When the flat die (22) is used, a pair of flat guides (32) is used as the guide (30).

  The roll guide (31) is installed on the roll die (21) in a vertically integrated type or a separated type, and in the case of the vertically integrated type, the roll die is an upper portion (11) on which a screw of the semi-finished product (10) is processed. ) So that the roll guide supports the remaining part (12) except for the upper part. In the case of the separation type, the roll guide is the lower part of the remaining part of the semi-finished product. It is only necessary to support the portion (12a).

  When the roll guide (31) is integrated with the roll die (21), the roll guide (31) is formed so as to be able to support the remaining part (12) excluding the upper part (11) of the semi-finished product (10). The semi-finished product has the advantage that it is supported more stably, but the overall weight is heavy and the production is cumbersome. If only the lower part (12a) is supported, there is an advantage that the weight is light and the manufacture is easy. However, since the supported part is limited to the lower part, it is relatively less than the integrated type. The support state is unstable.

Considering this, the roll guide (31) supports the lower part (12a) of the semi-finished product (10), while the auxiliary roll guide (relatively short length) is provided at the lower end of the roll die (21). 31a) is a semi-finished product compared to the case where the roll guide supports only the lower part, as well as the advantages of light weight and relatively easy manufacture if it is provided as an integral type or a separate type. It also has the advantage that the support state of (10) is stable.
When the roll guide (31) is integrated with the roll die (21), the roll guide (31) may be installed so as to rotate coaxially. When the roll guide (31) is separated, the roll guide (31) may be installed so as to rotate coaxially together. You may install so that each may rotate on the axis.

  On the other hand, the flat guide (32) may be installed so as to be integrated with the roll die (22) vertically or separately, but in the case of the vertically integrated type, the flat die is a screw of the semi-finished product (10). Pressurizes the upper part (11) to be processed, so that the flat guide supports the remaining part (12) except for the upper part, and in the case of a separate type, the flat guide is the rest of the semi-finished product. Of these parts, only the lower part (12a) needs to be supported.

  Further, when the flat guide (32) is integrated with the flat die (22), if it is formed long enough to support the remaining part (12) excluding the upper part (11) of the semi-finished product (10), Although the semi-finished product is more stably supported, the overall weight is heavy and the production is troublesome. The flat guide is manufactured as a separate mold, and the lower part of the semi-finished product (12a ) Only has the advantage of being light weight and easy to manufacture, but the supported part is limited to the lower part, so the support state is relatively less than the integrated type. It is stable.

Considering this, the flat guide (32) supports only the lower part (12a) of the semi-finished product (10), while the lower end of the flat die (22) has a relatively short auxiliary flat. If the guide is provided as an integral type or a separate type, the weight is light and the manufacturing is relatively easy. Of course, the flat guide (32) is a semi-finished product compared to the case where only the lower part (12a) is supported. It also has the advantage that the support state of (10) is stable.
When the flat guide (31) is integrated with the flat die (21), the flat guide (31) is installed so as to operate together. On the other hand, when the flat guide (31) is separate, it may be installed so as to operate together. You may install so that it may operate.

FIGS. 5a and 5b are schematic configuration diagrams showing still another embodiment of the guide for performing the rolling step in the manufacturing process of the present invention. As the die (20), a roll die (21) and a flat die (22) are shown. On the other hand, the guide (30) relates to the case where the pipe guide (33) is used.
When using the pipe guide (33), its length (l) guides from the remaining part (12) except the upper part (11) which is pressed by the die (20) of the semi-finished product (10). The inner diameter (r) can be adjusted in consideration of the degree, and the rotation of the semi-finished product as well as the lower part can be joined or separated without any trouble, and at the same time, the shake can be prevented. It should be almost the same as the outer diameter of the lower part.

  The process of rolling a screw with a pair of roll dies (21) and flat dies (22) into a semi-finished product (10) in the method and apparatus for manufacturing a preheating plug for a diesel engine according to an embodiment of the present invention is as follows. Although it is general, the remaining part (12) and the lower part (12a) except the upper part (11) where the screws of the semi-finished product are processed are supported by the guide (30) and the runout is generated. By preventing this from occurring, the roll or flat die presses and rolls the upper portion to prevent the eccentricity and the like from occurring.

  On the other hand, when the support stage using the guide (30) is applied to manufacture a product having a relatively long length, such as a long bolt for machining a part of a screw, it is cut to a certain length. A flat processing step for processing both cross sections of the material cut by the cutting step into a flat surface, and a head portion that pressurizes the upper end portion of the material to increase the diameter so that a head portion can be formed, and then processes the hexagonal shape. Using a die (20) in a necessary part of the remaining part (12) excluding the head part of the semi-finished product (10) obtained through the processing step (10a), a thread is processed. In order to prevent the semi-finished product from shaking or decentering, the rolling step may be performed after supporting the portion excluding the portion where the die is pressed with the guide (30).

  Further, in the present invention, the support step using the guide (30) is not necessarily applied only when the preheat plug or the long bolt is manufactured, and a roll die (21) or a part of the semi-finished product (10) Any product obtained by rolling a screw with a flat die (22) can be applied to all products, and such a case also belongs to the scope of rights of the present invention.

<Effect of invention>
According to such a method and apparatus for manufacturing a preheating plug for a diesel engine according to an embodiment of the present invention, in the process of processing a screw by rolling to a semi-finished product of the preheating plug, the deflection of the semi-finished product and the eccentricity of the processed screw are obtained. As a result, there is a problem that when the heat is applied to the plug hole of the engine head, the heat generation part of the preheating plug comes into contact with the plug hole, as well as the heating wire is disconnected due to overheating. There is an advantage that can be resolved.
Further, by preventing run-out (eccentricity), the rolling process becomes very easy. In addition, the quality and durability are greatly improved, and at the same time, the shortening of the life is eliminated.

FIG. 1a is a state diagram in which the preheating plug is normally attached to the engine head. FIG. 1b is a state diagram in which the preheating plug is eccentrically attached to the engine head. FIG. 2 is a manufacturing process diagram of a preheating plug for a diesel engine to which the embodiment of the present invention is applied. FIGS. 3a to 3c are schematic diagrams schematically showing different embodiments of a roll die and a roll guide that perform a rolling step in the manufacturing process. 4a to 4c are schematic diagrams schematically showing different embodiments of a flat die and a flat guide that perform a rolling step in the manufacturing process. FIGS. 5a and 5b are schematic configuration diagrams showing further different embodiments of the guide for performing the rolling stage in the manufacturing process.

Explanation of symbols

10: Semi-finished product 11: Upper part 12: Remaining part 12a: Lower part 20: Die 21: Roll die 22: Flat die 30: Guide 31: Roll guide 32: Flat guide 31a: Auxiliary roll guide 33: Pipe guide

Claims (13)

After the diameter of the upper end of the material cut to a certain length is increased, a screw is processed using a die on the part of the semi-finished product that has been processed into a hexagon to form the head. In a rolling process method including a rolling stage to
When the rolling step is performed, the semi-finished product is supported by a guide, except for the part that is pressed by the die and processed into a screw, and the semi-finished product is shaken or processed by the screw machining process. A rolling process method further comprising a guide step for supporting the shaft so as not to cause eccentricity. In item 1,
The die for performing the rolling step is a pair of roll dies,
The guide for performing the guide step is a pair of upper and lower roll guides integrated with the roll die so as to support the remaining part of the semi-finished product excluding the part where the roll die is pressurized. A rolling method characterized by that. In item 1,
The die for performing the rolling process step is a pair of roll dies,
The guide for performing the guide step is a pair of roll guides which are separated from the roll die, and the lower part of the remaining part excluding the part where the roll die is pressed in the semi-finished product A rolling process method characterized by supporting the above. In item 1,
The die for performing the rolling process step is a pair of roll dies,
The guide for performing the guide step is separated from the roll die, and a pair of roll guides that support the lower portion of the remaining portion excluding the portion where the roll die is pressed in the semi-finished product, and The lower end of the roll die is either an integral type or a separated type, and is provided with a relatively short length, and is composed of an auxiliary roll guide that supports the portion directly under the portion to which the roll die pressurizes. A featured rolling method. In item 1,
The die for performing the rolling process step is a pair of flat dies,
The guide for performing the guide step is a pair of flat guides integrated with the flat die, and supports the rest of the semi-finished product excluding the portion where the flat die is pressurized. A rolling method characterized by that. In item 1,
The die for performing the rolling process step is a pair of flat dies,
The guide for performing the guide step is a pair of flat guides separated from the flat die, and the lower portion of the remaining portion excluding the portion where the flat die is pressed in the semi-finished product. A rolling process method characterized by supporting the above. In item 1,
The die for performing the rolling process step is a pair of flat dies,
The guide for performing the guide step is a pair of flat guides which is separated from the flat die and supports only the lower part of the remaining part except the part where the flat die is pressed in the semi-finished product. And an auxiliary flat guide that is provided at the lower end of the flat die as either an integral type or a separated type, and supports the portion directly below the portion to which the flat die pressurizes. Rolling processing method. In item 1,
The die for performing the rolling process step is either a pair of roll dies or flat dies,
The guide for performing the guide step is a pipe guide that is separated from the roll die or flat die,
A rolling process method characterized by supporting a lower part of the remaining part excluding a part to which a roll die or a flat die is pressed in the semi-finished product. After the diameter of the upper end of the material cut to a certain length is increased, a screw is processed using a die on the part of the semi-finished product that has been processed into a hexagon to form the head. In the rolling processing equipment
Each of the dies is a pair of roll dies or flat dies,
A pair of roll guides, each supporting a portion of the semi-finished product excluding the portion where the die is pressed so that the semi-finished product does not shake during processing of the screw, or eccentricity or the like occurs in the processed screw. A rolling apparatus provided with any one of flat guides. In item 9,
The guide is configured integrally with the die and vertically.
The rolling processing apparatus is installed so as to support the remaining part of the semi-finished product excluding the part where the die is pressed. In item 9,
The guide is configured to be separated from the die.
The rolling processing apparatus is installed so as to support the lower part of the remaining part excluding the part where the die is pressed in the semi-finished product. In item 9,
The guide is composed of a pair of guides that support only the lower part of the remaining parts excluding the part where the die is pressed in the semi-finished product, and a short length at the lower end of the die. A rolling processing apparatus which is either a body type or a separation type and is constituted by an auxiliary guide which supports a portion directly under a portion to which the die is pressed. In item 9,
The guide is composed of a pipe guide that is separated from the roll die or flat die,
A rolling processing apparatus, characterized in that, in the semi-finished product, the rolling die or the flat die is installed so as to support the lower portion of the remaining portion excluding the portion to which pressure is applied.

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