JP2018065166A - Wrench manufacturing process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wrench manufacturing process by which waste of a material and a manufacturing cost are reduced and a processing time is shortened, whereby a processing efficiency can be enhanced.SOLUTION: According to this process, at a preparation step 41, a round bar-shaped metal blank is thermally treated and is so made as to be in a high temperature softened state, and further, rolling processing of the metal blank is performed, whereby the metal blank is so formed as to have a slender flat shape. Next, at an initial forging step 42, forging of a part of the metal blank is performed thereby forming a rod body area, and a head part area having a width wider than that of the rod body area. Next, at a first end head stamping step 43, forging of the head part area is performed thereby so making an outer shape thereof as to have an arcuate appearance. Finally, at a finishing step 44, stamping of the head part area is performed again thereby removing an excess material, and stamping formation of a lock part for a locked object is formed thereby obtaining a wrench after formation.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a wrench manufacturing process.

As shown in FIGS. 1 and 2, the conventional wrench cold forging manufacturing method 3 includes a preparation step 31, a head forming step 32, a stamping forming step 33, and a blank removing step 34.
In the preparation step 31, a round metal bar b is prepared.
In the head forming step 32, the two ends of the metal blank b are respectively cold forged stamped to form the circular heads h on both sides.
The stamping forming step 33 uses a stamping press (not shown) to stamp the metal blank b having the circular heads h on both sides, flatten the entire metal blank b, and form the appearance of a wrench.
In the blank removal molding step 34, another stamping press (not shown) is used to remove excess material generated in the peripheral position of the entire wrench appearance, leaving the wrench appearance structure.
Thus, the molding of the wrench S2 is completed.

Since the metal blank b has a round bar shape and a constant thickness, and the circular heads h are formed at both ends, a flat wrench appearance can be formed.
In the conventional technique, the metal blank b cannot be driven and stamping can be performed unless a special stamping press having a relatively large power number is used.
Further, in the stamping step 33, another stamping press larger than the power number of the stamping press used for the cold forging stamping in the head forming step 32 must be prepared.

That is, since the number of powers of the stamping press required for the head forming step 32 and the stamping forming step 33 is considerably higher than that of a general stamping press, the equipment cost is also greatly increased.
Thereby, unless the processing cost of the manufacturing process is significantly increased, the molding operation of the wrench S2 cannot be completed, and the cost performance is poor and improvement is expected.

In the prior art, the number of powers of the stamping press required in the head forming step and the stamping forming step is higher than that of a general stamping press. There is a drawback that the molding operation cannot be completed and the cost performance is poor.
The problem to be solved by the present invention is to provide a wrench manufacturing process capable of improving processing efficiency by reducing material waste and manufacturing cost and shortening processing time.

The inventive wrench manufacturing process of the present invention comprises at least a preparation step, an initial forging step, a first end head stamping step and a finishing step.
In the preparation step, a long and thin metal blank is prepared by high-temperature heating and rolling.
Next, in the initial forging step, a rod body area is forged at one end of the elongated flat metal blank, and a head area having a size larger than the rod body area is formed at an unforged position of the metal blank.
Next, in the first end head stamping step, the head area is stamped to form an arcuate appearance.
Finally, in the finishing step, the head area having an arcuate appearance is stamped again to remove any remaining waste, and at the same time, a locking portion for the locked object is formed in the head area. Complete the molding operation.

The following configuration may be adopted.
A second end stamping step is separately performed between the first end head stamping step and the finishing step, and the second end head stamping step is performed with respect to an end of the rod body area opposite to the head area. The end of the bar body area is expanded by stamping so that the outer shape has an arcuate appearance. At the same time, the size of the arcuate appearance formed at the end of the bar body area is reduced to the head area. Smaller than the size of the arcuate appearance to be formed, and in the finishing step, the head area and the end of the bar area are simultaneously stamped to remove excess material, and at the same time the head area of the wrench and A structure in which the locking portions are stamped at the end portions of the rod body area.
The width of the elongated flat metal blank prepared by the preparation step is at least equal to the maximum outer diameter of the wrench after forming.
The elongated and flat metal blank is a continuous winding wire, and after the preparation step, a cutting step is added, and in the cutting step, a cutting machine is used, and the metal wire is cut into one wrench by the cutting machine. A configuration in which the initial forging step is performed by further clamping after cutting into a size.

In the first-end head stamping step, the head area is stamped and its outer shape is formed into an arcuate appearance. At the same time, in the stamping molding process, an unfinished locking part prototype is initially formed at the arcuate appearance position. Configuration to do.
In the first-end head stamping step, a head manufacturing machine is used to stamp the head area. The head manufacturing machine includes a machine base, a fixed mold and a push-up unit installed on the machine base, and the fixed mold. And a press mold corresponding to each other, and a clamping unit that is installed on the machine base and clamps the metal blank at the fixed mold position. The molding tank and the molding tank are arranged on the fixed mold. A material exit hole communicating with the material is opened, and the material exit hole is installed in the push-up portion.

In the second end stamping step, the end portion of the rod body area is stamped by a molding machine, and the molding machine is installed in correspondence with a pair of lateral molds that sandwich the metal blank, and the lateral molds. A stamping mold for stamping the end of the rod body area is installed, and each lateral mold has a mold hole for receiving the end of the rod body area deformed by stamping.
A configuration in which a heat treatment is performed on the metal blank before performing the initial forging step and the first end head stamping step (and the second end head stamping step).

  According to the present invention, in the preparation step, by preparing a long and flat metal blank by rolling, it is not necessary to perform processing on the entire metal blank at the time of stamping. Can be effectively reduced, and by using a long and flat metal blank, it can be replaced with a manufacturing method using an expensive machine, and the production process speed can be further increased. And finishing work) can be easily performed, so that the manufacturing time can be shortened, the production processing speed can be increased, and the waste formed in the processing process can be reduced.

It is a flowchart of the conventional wrench manufacturing method. It is a schematic diagram which shows the conventional wrench manufacturing process. It is a flowchart of the wrench manufacturing method which shows the 1st Example of this invention. It is a schematic diagram of the wrench manufacturing process which shows the 1st Example of this invention. It is a block chart of the structural member of the head manufacturing machine which concerns on 1st Example of this invention. It is a schematic diagram of a head manufacturing machine according to the first embodiment of the present invention. It is a flowchart of the wrench manufacturing method which shows the 2nd Example of this invention. It is a schematic diagram of the wrench manufacturing process which shows the 2nd Example of this invention. It is a schematic diagram of another form of the wrench manufacturing process which shows the 2nd Example of this invention. It is a block chart of the structural member of the die spotting press machine which concerns on 2nd Example of this invention. It is a principal part perspective view of the die spotting press machine which concerns on 2nd Example of this invention. It is a flowchart of the wrench manufacturing method which shows the 3rd Example of this invention. It is a flowchart of the wrench manufacturing method which shows 4th Example of this invention. It is a flowchart of the wrench manufacturing method which shows 5th Example of this invention. It is a flowchart of the wrench manufacturing method which shows 6th Example of this invention. It is a flowchart of the wrench manufacturing method which shows 7th Example of this invention. It is a flowchart of the wrench manufacturing method which shows the 8th Example of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
3 to 6 show a first embodiment of the present invention.
As shown in FIGS. 3 and 4, the wrench manufacturing process 4 of the first embodiment includes a preparation step 41, an initial forging step 42, a first-end head stamping step 43, and a finishing step 44.

In the preparation step 41, a long and flat metal blank 5 is prepared.
The elongated and flat metal blank 5 is obtained by heat-treating a round bar-shaped metal blank, bringing the metal blank 5 into a high-temperature softened state, and further rolling.
Thereby, the shape of the metal blank 5 is elongated and flat, and is used for subsequent processing.
In the present embodiment, the width w of the metal blank 5 is at least equal to the maximum outer diameter of the wrench 8 after molding, and the thickness of the metal blank 5 is equal to the thickness of the wrench 8 after molding.

In the initial forging step 42, the bar body area 52 is forged at one end of each metal blank 5 prepared in the preparation step 41.
At the same time, a head area 51 is formed at an unforged position of the metal blank 5.
Therefore, the width w1 of the head area 51 and the width w of the metal blank 5 are similar, and the width w2 formed in the rod area 52 after forging is smaller than the width w1 of the head area 51, and thus the blank 5 is T It becomes a mold form.
In the forging reduction process of the rod body area 52, the internal structure of the rod body area 52 becomes more dense, and the strength of the rod body area 52 can be effectively increased.
At the same time, in the present embodiment, the end 521 of the rod body area 52 installed in the direction opposite to the head area 51 is directly formed into an arc contour or is not specially modified in the initial forging process, and the square contour is changed. Hold (see FIG. 4).

As shown in FIGS. 5 and 6, in the first end head stamping step 43, stamping is performed on the head area 51 formed in the initial forging step 42.
In the first end head stamping step 43, in this embodiment, the head making machine 6 is used for processing.
The head manufacturing machine 6 is installed on a machine base 61, a fixed mold 62 and a push-up unit 63 installed on the machine base 61, a press mold 64 corresponding to the fixed mold 62, and a machine base 61, and a metal blank. 5 has a clamping unit 65 that clamps 5 at the position of the fixed mold 62.

At the same time, on the fixed mold 62, a forming tank 621 and a material exit hole 622 that communicates with the forming tank 621 are opened.
Moreover, the material exit hole 622 is installed at a position that coincides with the push-up portion 63, and the push-up portion 63 is fitted in the material exit hole 622 so as to be able to appear and retract.
Then, when the metal blank 5 having the head area 51 is put into the fixed mold 62 through the operation of the clamping unit 65, the molding tank 621 can just accommodate the head area 51 therein, and is opposed to the molding tank 621. In order to receive the stamping of the press mold 64 provided as described above, the head area 51 is formed into an arcuate appearance d1.
In the molding process, an unfinished locking portion prototype h1 is initially formed as a defective portion at the position of the arcuate appearance d1 so that a locking portion 81 described later can be easily formed.
Thereafter, the push-up portion 63 enters the material exit hole 622 and pushes up the metal blank 5.
As a result, the metal blank 5 is withdrawn from the fixed mold 62 and proceeds to the subsequent step 44.

Finally, a finishing step 44 is performed.
Here, stamping is performed again on the arc-shaped appearance d1 formed in the head area 51 obtained by the first end head stamping step 43.
At this time, since there is not much extra material protruding outside the head area 51, the extra material can be removed and a finishing effect can be achieved without using a stamping press with a large output, so the cost is relatively low. .
At the same time, the final size and shape of the locking portion 81 with respect to the locked object are stamped at the position of the head area 51.
In this way, the manufacturing process of the wrench 8 is completed.

The shape of the wrench 8 after molding is classified into three types.
In one type, as shown after manufacturing the A process shown in FIG. 4, the head area 51 forms a circular head shape, and a sealing type locking portion 81 formed of a circular hole is opened at the center.
In the other type, as shown after manufacturing the B process in FIG. 4, the head area 51 has an arc appearance, and a locking portion 81 formed of a U-shaped notch communicating with the outside is opened at the center.
In the last type, as shown after the manufacture of the C process in FIG. 4, the head area 51 has a semicircular arc appearance and forms an engaging portion 81 formed of an L-shaped notch communicating with the outside.
The C-type configuration can be a semi-finished product of a monkey wrench in particular, and other components are attached to the C-type configuration, and finally the monkey wrench used for various bolt heads is configured (not shown) ).
Further, since the basic molding is already performed before the finishing step 44 as the locking portion prototype h1, the molding operation of the locking portion 81 at the final stage is simple and quick.

For the long and flat metal blank 5, the rod body area 52 is forged in the initial forging step 42.
Thereby, not only the strength of the rod body area 52 can be increased, but the head area 51 is naturally formed without being forged, and the head area 51 is stamped in the subsequent first end head stamping step. Just good.
Thus, the mechanical power required for the stamping process can be reduced and the machining cost can be reduced.
In addition, the thin and flat blank corresponds to the processing work of the local end stamping in the initial forging step, and can not only increase the overall strength of the wrench 8 after production, but also reduce the waste generated by processing, As a result, processing costs, waste of materials, and processing time can be effectively reduced.

7 to 10-2 show a second embodiment of the present invention.
As shown in FIG. 7, the wrench manufacturing process 4 of the second embodiment includes a preparation step 41, an initial forging step 42, a first one end stamping step 43, and a finishing step 44. The steps are the same as in the first embodiment, and will not be described in detail.

A second end stamping step 45 is separately performed between the first end stamping step 43 and the finishing step 44.
The second end stamping step 45 performs stamping on the end 521 of the rod body area 52 (the end opposite to the head area 51).
As a result, the end portion 521 is expanded by stamping, and has an external appearance d2 whose outer shape is arcuate.

Specifically, as shown in FIGS. 10A and 10B, the molding machine 7 employed in this embodiment performs the second end stamping step 45 on the end 521 of the rod body area 52.
The molding machine 7 includes a pair of lateral molds 71 that can sandwich the metal blank 5 and a stamping mold 72 that is installed corresponding to the end surfaces of both lateral molds 71.
A mold hole 711 is provided on the end surface of each lateral mold 71.

At the time of operation, first, the rod body area 52 is firmly sandwiched between the transverse molds 71.
Subsequently, the stamping mold 72 performs stamping on the end portion 521 of the rod body area 52.
As a result, the end 521 is deformed and expanded, and just fills the mold hole 711.
Thus, the end 521 has an arcuate appearance d2.
As shown in FIG. 8 or FIG. 9, the size of the arcuate appearance d <b> 2 is smaller than the size of the arcuate appearance d <b> 1 of the head area 51.
Finally, the metal blank 5 is withdrawn sideways from each sideways mold 71 and is useful for the subsequent step 44.

  When performing steps 43 and 45, the arcuate appearances d1 and d2 do not need to be molded with the locking part prototypes h1 and h2 first (see FIG. 8), and when performing steps 43 and 45, the arcuate appearances d1 and d2 At the same time, the locking portion prototypes h1 and h2 are formed in an elementary manner (see FIG. 9), which is advantageous for simple and quick forming of the final locking portions 81 and 82.

In the finishing step 44, the head area 51 and the end portion 521 of the rod body area 52 are simultaneously stamped to remove excess material on the arcuate appearances d1 and d2.
At the same time, the locking parts 81 and 82 having the final size and shape are stamped at the positions of the head area 51 and the end part 521, thus completing the wrench 8.

In the second embodiment, the shape of the wrench 8 after molding is divided into three types.
As shown in FIG. 9, after manufacturing the A process in FIG. 9, both ends have a circular shape, and in the center, a sealing type locking portion 81, 82 is opened.
As shown in FIG. 9, after manufacturing the B process, the other type has a circular shape at one end, and a closed locking portion 81 is opened at the center, and the other end has an arc appearance, and further outwards. The engaging portion 82 that communicates is established.
As shown in FIG. 9, after the C process is manufactured, the last type is provided with locking portions 81 and 82 having both ends having an arc appearance and communicating with the outside.
All of the above three types A, B, and C are completed with a mold structure by the same working method.

As shown in FIGS. 11 and 12, the third embodiment and the fourth embodiment of the present invention include the same steps as the first embodiment and the second embodiment, respectively.
In the third and fourth embodiments, the elongated and flat metal blank 5 is a wire rod for continuous winding.
At the same time, after the preparation step 41, a cutting step 46 is added.

The cutting step 46 uses a cutting machine 9 (shown only by a block chart in the drawing).
The cutting machine 9 is used to cut the wire into the size of one wrench, and directly hold the cut metal blank 5 to perform subsequent manufacturing steps 42, 43, 44, and 45.
The operation and purpose of the subsequent initial forging step 42, the first end stamping step 43, the second end stamping step 45, and the finishing step 44 are the same as those in the first and second embodiments. do not do.

FIG. 13 shows a fifth embodiment of the present invention, FIG. 14 shows a sixth embodiment of the present invention, FIG. 15 shows a seventh embodiment of the present invention, and FIG. 16 shows an eighth embodiment of the present invention.
The fifth embodiment and the sixth embodiment include the steps of the first embodiment and the second embodiment, respectively.
Further, the seventh embodiment and the eighth embodiment are different from the fifth embodiment and the sixth embodiment only in that a cutting step 46 is added corresponding to the winding wire.

In the embodiment shown in FIGS. 13 to 16, before the initial forging step 42 and the first end head stamping step 43 (and the second end head step 45) are applied to each metal blank 5, On the other hand, a heat treatment 47 is performed.
The heat treatment 47 is performed using a method such as high-frequency heating.
The heat treatment 47 is performed before any step of the initial forging step 42, the first end head stamping step 43, and the second end head step 45.
Alternatively, before the initial forging step 42, the first end head stamping step 43, and the second end head step 45, all heat treatment 47 is performed.
By performing the heat treatment 47 before the initial forging step 42, the metal blank 5 can rapidly forge the rod body area 52 during the initial forging step 42.
Furthermore, when the first and second end stamping steps 43 and 45 are performed, the arc-shaped appearances d1 and d2 can be stamped quickly and easily on both ends of the blank 5 by the action of the heat treatment 47.
Thereby, the amount of waste can be reduced, waste of unnecessary materials can be avoided, working time can be shortened, and processing efficiency can be increased.

  In the preparation step 41, the present invention is based on rolling the material by a high-temperature heating method to form an elongated and flat metal blank 5. Further, in the initial forging step 42, the bar body area 52 is forged at one end of the metal blank to increase the blank strength, and at the same time, the head area 51 larger in size than the bar body area 52 is formed in the unforged position of the metal blank 5. Therefore, the subsequent first end head stamping step 43 or the first and second end head stamping steps 43 and 45 are performed by performing local stamping by using the head manufacturing machine 6 and the molding machine 7 for mass processing production. Since it can be changed to a conventional working method that employs a stamping press with a large output, the processing cost can be reduced and the processing speed can be accelerated.

Further, stamping is performed only on at least one end (head area 51) of the blank 5, and no forging is performed on the head area 51 in the initial forging step 42. At the same time, and at the same time, it is possible to quickly and easily stamp the arc-shaped appearance having the outer mold of the wrench 8. Moreover, because less waste is produced, material costs and unnecessary waste can be reduced.
Finally, a finishing step 44 is performed to remove the remaining small amount of waste, and the manufacturing process of the wrench 8 can be completed quickly.

As described above, the wrench manufacturing process of the present invention prepares a long and thin metal blank by the preparation step, forms a rod body area on the metal blank by the initial forging step, and the unforged portion as a head area. Leaving a further arc-shaped appearance on at least one end (head area) of the blank by a first end-head stamping step, and finally removing a small amount of waste left in the locking position by a finishing step, and finally Forming the locking part of the shape, the wrench manufacturing process work can be completed quickly.
In this way, manufacturing time can be shortened, processing efficiency can be increased, and waste of materials and costs can be greatly reduced.

  The embodiments of the present invention described above do not limit the scope of rights of the present invention, and the scope protected by the present invention is based on the following claims.

[Conventional technology]
3 Cold Forging Manufacturing Method for Wrench 31 Preparation Step 32 Head Forming Step 33 Stamping Molding Step 34 Blank Removal Step b Round Bar Metal Blank h Circle Head S2 Wrench
[Invention]
4 Wrench manufacturing process 41 Preparation step 42 Initial forging step 43 First end stamping step 45 Second end stamping step 44 Finishing step 46 Cutting step 47 Heat treatment 6 Head manufacturing machine 61 Machine base 62 Fixed mold 63 Push-up part 64 Press Mold 65 Holding unit 621 Molding tank 622 Material exit hole 7 Molding machine 71 Horizontal mold 72 Stamping mold 711 Mold hole 5 Elongated and flat metal blank 51 Head area 52 Bar body area 521 Bar body area end 8 Wrench 81 after molding , 82 Locking section 9 Cutting machine w Metal blank width w1 Head area width w2 Bar body width d1, d2 Arc-shaped appearance with wrench outer mold h1, h2 Locking section prototype

Claims (10)

A wrench manufacturing process, which in turn includes the following steps:
The preparation step is a step of preparing a long and flat metal blank. In the preparation step, the round bar-shaped metal blank is heat-treated, the metal blank is softened at a high temperature, and further subjected to a rolling treatment. The metal blank is formed into an elongated flat shape,
In the initial forging step, a part of the metal blank is forged to form a rod body area, and at the same time, a head area is formed at an unforged position of the metal blank, and the width of the head area is the rod Larger than the width of the body area,
In the first end head stamping step, forging the head area, the outer shape of the head area is an arc-shaped appearance,
In the finishing step, the head area having the arcuate appearance obtained by the first end head stamping step is re-stamped to remove excess material, and at the same time, the locking portion for the object to be locked is removed from the head area. A wrench manufacturing process characterized by stamping and obtaining a wrench after molding. Performing a second end stamping step separately between the first end stamping step and the finishing step;
The second end stamping step performs stamping on the end of the rod area opposite to the head area, whereby the end of the rod area is expanded by stamping and the outer shape thereof is arcuate. Appearance
At the same time, the size of the arcuate appearance formed at the end of the rod area is smaller than the size of the arcuate appearance formed in the head area,
In the finishing step, the head area and the end of the bar area are simultaneously stamped to remove excess material, and at the same time, the end of the wrench head area and the bar area is locked. The wrench manufacturing process according to claim 1, wherein each part is stamped.   The wrench manufacturing process according to claim 1 or 2, wherein a width of the elongated flat metal blank prepared by the preparation step is at least equal to a maximum outer diameter of the wrench after forming. The elongated and flat metal blank is a continuous winding wire, and after the preparation step, a cutting step is added,
3. The initial forging step according to claim 1, wherein a cutting machine is used in the cutting step, and the metal wire is cut into a size corresponding to one wrench by the cutting machine, and is further sandwiched to perform the initial forging step. 4. Wrench manufacturing process. The first end head stamping step stamps the head area and shapes its outer shape into an arcuate appearance;
2. The wrench manufacturing process according to claim 1, wherein an unfinished locking portion prototype is initially formed at the arcuate appearance position in the stamping forming process. In the first end head stamping step, using a head making machine, stamping the head area,
The head making machine includes a machine base, a fixed mold and a push-up unit installed on the machine base, a press mold corresponding to the fixed mold, and a machine installed on the machine base, and fixing the metal blank. It has a clamping unit that clamps at the mold position,
The fixed mold is provided with a molding tank that opposes the press mold and accommodates the head area, and a material outlet hole that communicates with the molding tank. The wrench manufacturing process according to claim 1 or 5, wherein the push-up portion that pushes up the blank is fitted so as to be able to appear and retract. In the second end stamping step, the end of the rod area is stamped to form its outer shape in an arcuate appearance,
3. The wrench manufacturing process according to claim 2, wherein in the stamping molding process, a chained prototype is initially molded at the arcuate appearance position. In the second end stamping step, the end of the rod body area is stamped with a molding machine,
In the molding machine, a pair of lateral molds that sandwich the metal blank, and a stamping mold that is installed corresponding to each lateral mold and stamps the end of the rod body area,
8. The wrench manufacturing process according to claim 2, wherein each of the lateral molds has a mold hole for receiving an end portion of the rod area deformed by stamping. 9.   The wrench manufacturing process according to claim 1, wherein a heat treatment is performed on the metal blank before performing the initial forging step and the first end head stamping step.   3. The wrench manufacturing process according to claim 2, wherein the metal blank is subjected to a heat treatment before the initial forging step, the first one-end head stamping step, and the second one-end head stamping step.

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