JP7466893B2 - Stamping Equipment - Google Patents

Description

The present invention relates to a stamping device, and in particular to a device that can effectively perform stamping on a workpiece (workpiece material) made of a high-hardness material.

In general, when machining with a machining center or the like, the workpiece (workpiece material) to be machined is fixed in a specified vice, but when a high processing load is applied to such a workpiece, the workpiece may become misaligned. Therefore, in order to improve the workpiece holding force in the vice, as shown in Japanese Utility Model Application Publication No. 62-174804 (Patent Document 1) and Japanese Patent Publication No. 2017-164846 (Patent Document 2), a structure is adopted in which multiple protrusions are provided on the vice jaw that clamps the workpiece, and the protrusions are directly inserted into the workpiece by the clamping force of the vice. However, if the workpiece becomes too hard, the clamping force of the vice may not be able to insert the multiple protrusions provided on the jaw, and there is also a risk that the tips of the protrusions may be damaged or deformed due to the hardness of the workpiece, making it impossible to use.

For this reason, conventionally, when machining a workpiece made of a hard material, a method has been adopted in which a dovetail groove is machined on the bottom of the workpiece, and a jaw with a convex shape that corresponds to the dovetail groove shape is attached to a vice to clamp the workpiece, ensuring a high holding force that can withstand the machining load. However, in this case, in addition to the problems of the cost and machining time required to machine the dovetail groove on the workpiece, there are inherent problems such as large material loss because the part of the workpiece with the dovetail groove is cut off after machining.

On the other hand, in the specification of US Patent No. 6,530,567 (Patent Document 3), a clamping method and a work fixing system are proposed in which a large number of small engagement recesses are formed in the lower part of the corresponding side of the work, and a large number of protrusions provided on the jaws of a vice are fitted into these engagement recesses, so that the work can be firmly clamped. In this case, it is said that the large number of engagement recesses arranged in the lower part of the two corresponding side of the work can be formed by stamping. However, when stamping a work made of a high-hardness material to form a large number of engagement recesses, if the stamping jaws are made of a material that can withstand the processing of such a work, not only will the stamping jaws become significantly more expensive, but if the forming protrusions that form the tip of the jaws are damaged or deformed by stamping, it will be necessary to replace the entire jaws, which will result in high running costs.

Japanese Utility Model Application Publication No. 62-174804 JP 2017-164846 A U.S. Pat. No. 6,530,567

The present invention was made against the background of the above circumstances, and the problem it aims to solve is to provide a stamping device that is suitable for stamping recesses for clamping workpieces made of high-hardness materials, and that has improved durability while advantageously reducing running costs.

The present invention can be suitably implemented in various aspects as listed below in order to solve the above problems, and each aspect described below can be adopted in any combination. It should be understood that the aspects and technical features of the present invention are not limited to those described below, but can be recognized based on the inventive concept as understood from the entire description of the specification and drawings.

The present invention is therefore a stamping device that solves the above-mentioned problems by pressing a stamping die having a plurality of forming protrusions arranged in a row against two corresponding sides of a workpiece to be processed, thereby forming a plurality of workpiece clamping recesses arranged in a row on each of the two sides of the workpiece, the stamping die being composed of a plurality of die tips made of cemented carbide and a tip holder that houses and holds the plurality of die tips in a row, and the stamping device is characterized in that the plurality of forming protrusions are divided, distributed, and formed on each of the plurality of die tips.

In one preferred embodiment of the stamping device according to the present invention, a storage recess having a U-shaped cross section with the upper side shorter than the lower side is formed at the corner of the tip holder, and the multiple nozzle tips are arranged in a row and stored in the storage recess.

In another preferred embodiment of the stamping device according to the present invention, a screw hole is formed through the upper edge portion that provides the storage recess, and a set screw is screwed into the screw hole to press the nozzle tip stored in the storage recess, thereby fixing the nozzle tip.

Furthermore, in the present invention, a V-shaped cross-sectional engagement groove is formed on the upper surface of the base tip, and the set screw is inserted into this engagement groove to press the base tip, which is an advantageous configuration.

In addition, according to another preferred embodiment of the stamping device of the present invention, the tip of the set screw is conical or truncated conical, and the axis of the set screw is configured to be located on the inner side of the storage recess than the tip of the V-shaped corner of the engagement groove formed in the mouth tip. By screwing in the set screw, the conical or truncated conical side of the tip is brought into contact with the side of the V-shaped engagement groove located on the inner side of the storage recess, and the mouth tip is pressed against the inner side of the storage recess and fixed.

The present invention advantageously employs a configuration in which a contact pin is disposed on the tip holder so as to be located on one end side of the accommodation recess, while a fixing member is attached to the tip holder so as to be located on the other end side of the accommodation recess, clamping and fixing the multiple nozzle tips that are accommodated in the accommodation recess and arranged in a row between the corresponding pin and the tip holder.

In this way, in the stamping device according to the present invention, the material used for the stamping die for forming the work clamping recess for the workpiece to be processed is changed from steel to cemented carbide, so that the desired work clamping recess can be formed advantageously and durable even in stamping a workpiece made of a high-hardness material, for example, a material having a hardness of HRC 35 or higher.

Moreover, in this invention, only the portion of the stamping die necessary for forming the work clamping recess is made of cemented carbide tip, and is manufactured separately from the die. This means that when it wears out, it is not necessary to replace the entire die, but only the minimum necessary portion (the tip). This reduces the initial cost while also effectively suppressing the cost of replacing the tip of the forming protrusion when it becomes deformed or worn out after many years of use.

Therefore, by forming a recess for clamping the workpiece outside the machine, such as a machining center, on the workpiece to be machined, and then clamping the workpiece inside the machine using a vice equipped with a jaw that has a protrusion that matches the shape of the recess, it is possible to achieve a higher holding force. This high holding force makes it possible to perform high-load processing, shorten processing time, and reduce processing costs.

1A and 1B are explanatory diagrams showing a workpiece that has been subjected to stamping processing, in which FIG. 1A is an explanatory perspective view thereof, and FIG. 1B is an enlarged explanatory partial view of the AA cross section in FIG. 1 is a front view and a partially enlarged explanatory view showing an example of a stamping device according to the present invention; 3 is a plan view of the stamping device shown in FIG. 2 and a partially enlarged view thereof; FIG. 3A is an explanatory diagram showing a cross section and a side of the stamping device shown in FIG. 2, (a) is an enlarged explanatory diagram of the B-B cross section in FIG. 2 (corresponding to the B'-B' cross section in FIG. 3), and (b) is an enlarged explanatory diagram of the right side in FIG. 2. FIG. 5 is an enlarged explanatory view of a portion C in FIG. 4 is a cross-sectional view taken along the line DD in FIG. 3 and an enlarged view of a main portion thereof. 3 is an explanatory diagram showing an enlarged view of one of the die tips used in the stamping device shown in FIG. 2, where (a) is an oblique explanatory view thereof, (b) is a front explanatory view thereof, (c) is a plan explanatory view thereof, (d) is a bottom explanatory view thereof, and (e) is a left side explanatory view thereof. 3 is a perspective explanatory view showing a fixed die body, which is a stamping die on the fixed side, used in the stamping device shown in FIG. 2 . FIG.

In order to more specifically clarify the configuration of the present invention, an example of an embodiment of a stamping device according to the present invention will be described in detail below with reference to the drawings.

First, Figure 1 shows an example of a workpiece to be processed in a predetermined manner, with stamping applied to a predetermined portion of the workpiece. In Figure 1, a number of (here, 15) workpiece clamping recesses 8 arranged in a row are formed on the lower portion of two corresponding side surfaces of the workpiece 2, i.e., one side surface 4 and the opposite side surface 6. These workpiece clamping recesses 8 are formed in a shape that gives them a trapezoidal cross section, as shown enlarged in Figure 1(b).

The stamping device according to the present invention forms a work clamping recess 8 for such a work 2, and an example of the stamping device is shown in FIG. 2 to FIG. 4. The stamping device 10 includes a pair of guide bars 12, 12 extending parallel to each other at a predetermined distance, a fixed jaw body 14, which is one of the stamping jaws, fixed to one end of the pair of guide bars 12, 12, a movable jaw body 16, which is the other stamping jaw, arranged on the other end side of the pair of guide bars 12, 12 and slidable along the pair of guide bars 12, 12, and a hydraulic cylinder 18 located behind the movable jaw body 16 to move it forward and backward.

Specifically, the fixed nozzle body 14 and the movable nozzle body 16, which are stamping nozzles, have the same configuration, and each nozzle body, i.e., the fixed tip holder 20 and the movable tip holder 22, are assembled in such a manner that the protrusions 20a, 20a; 22a, 22a provided on both sides of each are fitted into the guide grooves 12a, 12a formed on the opposing inner surfaces of the pair of guide bars 12, 12, as shown in Figures 4(a) and (b). The fixed tip holder 20 is fixed to the pair of guide bars 12, 12 by screwing in the fixing bolts 24, 24 that pass through the pair of guide bars 12, 12, as shown in Figure 4(a), and the fixed nozzle body 14 is thereby held in a fixed position.

The movable tip holder 22 is not fixed to the pair of guide bars 12, 12 like the fixed tip holder 20, but can slide in the longitudinal direction of the guide bar 12 along the guide groove 12a of the guide bar 12. The hydraulic cylinder 18 located behind the movable tip holder 22 is fixed to the pair of guide bars 12, 12 with mounting screws 26, 26, and the piston member 28 is moved forward/backward by supplying and discharging hydraulic pressure to the hydraulic cylinder 18. The tip of the piston member 28 is attached to the back of the movable tip holder 22, and the movable tip holder 22, and the movable jaw body 16, are slid along the longitudinal direction of the guide bar 12 by the operation of the hydraulic cylinder 18, so that the workpiece 2 to be machined can be clamped between the fixed jaw body 14 and the movable jaw body 16 as shown in FIG. 2.

The portions of the fixed jaw body 14 and the movable jaw body 16 that come into contact with the workpiece 2 and form a number of workpiece clamping recesses 8 arranged in a row on the two corresponding side surfaces 4, 6 of the workpiece 2 respectively have the same structure, and the details of one of the fixed jaw bodies 14 are shown enlarged in Figures 2, 3, 5 and 6. Also, Figure 8 shows the fixed jaw body 14 removed from the pair of guide bars 12, 12 in the form of a perspective view.

As is clear from these figures, the fixed nozzle body 14 is composed of a fixed tip holder 20, which is the nozzle body, and a plurality (five in this case) of nozzle tips 30 made of cemented carbide arranged in a row at the upper corner of the tip holder 20. As is clear from the enlarged views of Figures 2 and 6 and Figure 8, a storage recess 31 is formed at the upper corner of the fixed tip holder 20, which has a U-shaped cross-sectional shape with the upper side 20b being shorter than the lower side 20c, and a plurality of nozzle tips 30 are arranged in a row and stored within this storage recess 31.

The nozzle tip 30 is made of cemented carbide so that it can withstand stamping even if the work 2 is made of a high-hardness material, such as HRC 35 or higher, and has a shape as shown in Figures 7(a) to (e). The nozzle tip 30 has a horizontally long rectangular block shape, and three forming protrusions 32 of a predetermined height protruding in a trapezoidal shape are integrally formed on one side of the front surface of the nozzle tip 30 at a predetermined distance in the horizontal direction, and an engagement groove 34 with a V-shaped cross section is formed in the horizontal direction of the nozzle tip 30 on the upper surface. The number of forming protrusions 32 arranged on the nozzle tip 30 is the total number of forming protrusions 32 required for the fixed nozzle body 14 divided by the number of nozzle tips 30 arranged in a row in the accommodation recess 31 of the fixed side tip holder 20, and three forming protrusions 32 are provided on the nozzle tip 30 in this case. The cemented carbide that constitutes the base tip 30 is a known material with a cermet structure in which carbides of metals such as tungsten (W), chromium (Cr), molybdenum (Mo), titanium (Ti), tantalum (Ta), and niobium (Nb) are bonded with Fe-group metals (Fe, Co, Ni).

These nozzle tips 30 are arranged in a row as shown in FIG. 8, with the forming protrusion 32 protruding forward from the front end surface of the upper side 20b provided at the upper corner of the fixed side tip holder 20, as shown in an enlarged view in FIG. 2. The tip of the array of the nozzle tips 30 is abutted against the side of the contact pin 36 erected on the fixed side tip holder 20 so as to be located at one end side of the accommodation recess 31, while the L-shaped fixed bracket 38 is fixed to the fixed side tip holder 20 by a locking bolt 40 so as to be located at the other end side of the accommodation recess 31 and abut against the rear end of the array of the nozzle tips 30. As a result, the nozzle tips 30 are sandwiched between the contact pin 36 and the fixed bracket 38, and are accommodated and held in the accommodation recess 31 so as to be prevented from moving laterally.

Furthermore, by screwing a set screw 44 into a plurality of screw holes 42 that are provided vertically penetrating the upper edge portion 20b of the fixed side tip holder 20, as shown in Figures 5 and 6, the tip of the set screw 44 is inserted into the V-shaped cross-sectional engagement groove 34 formed on the upper surface of the nozzle tip 30 and abuts against each of the multiple nozzle tips 30 held in a row within the storage recess 31, thereby preventing the nozzle tips 30 from slipping out. In particular, as shown enlarged in FIG. 6, the tip of the set screw 44 is conical or truncated conical, and the axis of the set screw 44 is configured to be located on the inner (deep) side of the accommodation recess 32 relative to the tip of the V-shaped corner of the engagement groove 34 formed in the ferrule tip 30. Therefore, when the set screw 44 is screwed in, the conical or truncated conical side of the tip of the set screw 44 abuts against the side of the V-shaped engagement groove 34 located on the inner side of the accommodation recess 32, and the ferrule tip 30 is pressed against the inner side of the accommodation recess 32, effectively fixing it.

Therefore, when stamping the work 2 to be processed using the stamping device 10 configured as above, as shown in FIG. 2, the work 2 is placed between the fixed jaw body 14 and the movable jaw body 16. Specifically, the work 2 is placed on the part of the lower edge part of the upper corner of each jaw body that is longer than the upper edge part. Then, the hydraulic cylinder 18 is operated to protrude the piston member 28 and press the movable tip holder 22 of the movable jaw body 16 from behind, so that the movable jaw body 16 moves toward the fixed jaw body 14. As a result, the forming convex parts 32 provided on each of the multiple jaw tips 30 held by the fixed tip holder 20 and the movable tip holder 22 are inserted into the lower parts of the two corresponding side surfaces of the work 2, and thus, as shown in FIG. 1, multiple work clamping concave parts 8 are effectively formed so as to be positioned in a row at the lower parts of the two side surfaces 4, 6 of the work 2.

In this way, in the stamping device 10 configured as described above, all of the multiple die tips 30 are made of cemented carbide, so even if the workpiece 2 is made of a high hardness material of HRC 35 or higher, the specified workpiece clamping recess 8 can be advantageously formed and the durability of the processing can be further effectively improved.

In addition, the entire fixed jaw body 14 and movable jaw body 16 that form the stamping jaws are not made of cemented carbide, but rather only the parts necessary for forming the work clamping recess 8 are made into separate bodies (jaw tips 30) and made of cemented carbide. This significantly reduces the amount of material used in the stamping jaws, effectively reducing the manufacturing costs of the fixed jaw body 14 and movable jaw body 16, and ultimately the initial costs of the stamping device 10. In addition, even if the forming protrusions 32 that form the work clamping recesses 8 wear out or are damaged or deformed, it is possible to deal with this by simply replacing the jaw tip 30 that has the forming protrusions 32, which advantageously reduces the repair costs (running costs).

As shown in the illustrated embodiment, the multiple nozzle tips 30 are arranged in a row in the U-shaped storage recess 31 provided in the fixed tip holder 20 or the movable tip holder 22, and are clamped by the contact pin 36 and the fixed bracket 38. Also, the nozzle tips 30 are abutted and fixed by the set screw 44, so that the nozzle tips 30 are held firmly. This makes it possible to effectively hold the nozzle tips 30 even during stamping of a hard workpiece.

Although one representative embodiment of the present invention has been described in detail above, it should be understood that this is merely an example and that the present invention should not be interpreted in any way as being limited by the specific description of such an embodiment.

For example, in the above embodiment, a structure is adopted in which five nozzle tips 30 are arranged in a row, but the number of such nozzle tips 30 used and the number of forming protrusions 32 formed per nozzle tip 30 are appropriately selected depending on the number of workpiece clamping recesses 8 formed in the target workpiece 2, but generally, the number of nozzle tips 30 used is approximately 10 or less, and approximately 2 to 4 forming protrusions 32 are formed per nozzle tip 30.

In addition, in the illustrated embodiment, the number of nozzle tips 30 arranged on the fixed nozzle body 14 and the movable nozzle body 16, and the number of forming protrusions 32 on each nozzle tip 30 are all the same, but there is no problem if they are different in number, and they can also be different sizes and shapes.

Furthermore, various known structures can be appropriately adopted for the structure for housing the multiple nozzle tips 30 in the fixed tip holder 20 and the movable tip holder 22, as well as for the fixing structure of the nozzle tips 30.

The stamping device 10 according to the present invention exhibits particularly excellent characteristics when a high-hardness material is used as the workpiece 2, but it goes without saying that it also exhibits similar effects when other materials are used.

Although we will not list them all here, the present invention can be embodied in various ways, with changes, modifications, improvements, etc., based on the knowledge of those skilled in the art, and it goes without saying that all such embodiments are within the scope of the present invention, so long as they do not deviate from the spirit of the present invention.

2 Workpiece 8 Workpiece clamping recess 10 Stamping device 12 Guide bar 14 Fixed jaw body 16 Movable jaw body 18 Hydraulic cylinder 20 Fixed tip holder 22 Movable tip holder 28 Piston member 30 Jaw tip 31 Storage recess 32 Forming protrusion 34 Engagement groove 36 Contact pin 38 Fixed bracket 40 Locking bolt 44 Locking screw

Claims (4)

A stamping device in which a stamping die having a plurality of forming convex portions arranged in a line is pressed against two corresponding side surfaces of a workpiece to be subjected to a predetermined processing, thereby forming a plurality of workpiece clamping concave portions arranged in a line on each of the two side surfaces of the workpiece,
The stamping die is composed of a plurality of die tips made of cemented carbide, and a tip holder which holds and accommodates the plurality of die tips in a line, and the plurality of forming protrusions are divided and distributed and formed on each of the plurality of die tips , while a receiving recess having a U-shaped cross section with an upper side shorter than a lower side is formed at a corner of the tip holder, and the plurality of die tips are arranged and accommodated in the receiving recess in a line,
A stamping device characterized in that a screw hole is formed through the upper edge portion which provides the accommodating recess, and a set screw is screwed into the screw hole to press the nozzle tip accommodated in the accommodating recess, thereby fixing the nozzle tip. 2. The stamping device according to claim 1, wherein an engagement groove having a V-shaped cross section is formed on an upper surface of the die tip, and the set screw is inserted into the engagement groove to press the die tip. The stamping device described in claim 2, characterized in that the tip of the set screw is conical or truncated cone shaped, and the axis of the set screw is configured to be located deeper into the accommodating recess than the tip of the V-shaped corner of the engagement groove formed in the base tip, so that when the set screw is screwed in, the conical or truncated cone shaped side of the tip is abutted against the side of the V -shaped engagement groove located deeper into the accommodating recess, and the base tip is pressed toward the deeper side of the accommodating recess and fixed. A stamping device as described in any one of claims 1 to 3, characterized in that a contact pin is arranged on the tip holder so as to be located on one end side of the accommodating recess, while a fixing member is attached to the tip holder so as to be located on the other end side of the accommodating recess, and clamps and fixes the multiple nozzle tips accommodated in the accommodating recess and arranged in a row between the contact pin and the tip holder.

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