JP2015078504A - Carbide tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carbide tool in which relative rotation of a carbide chip against a holding member and separation of the carbide chip from the holding member can be certainly prevented.SOLUTION: The carbide tool is a carbide tool which comprises a base metal body 6 provided with a fitting concave part 26, a holding member 12 provided with a housing concave part 16, and a carbide chip 10 fitted to the housing concave part 16 of the holding member 12. A fitting open hole 20 which passes through the housing concave part 16 is provided at the holding member 12, and an insertion hole 22 is provided at the carbide chip 10 as passing therethrough. The carbide chip 10 is mounted to the holding member 12 by fitting a shaft member 24 passing through the fitting open hole 20 and the insertion hole 22 after being fitted to the housing concave part 16 of the holding member 12. The holding member 12 is fixed to the base metal body 6 by welding, squeezing, etc. after being inserted into the fitting concave part 26.

Description

  The present invention relates to a cemented carbide tool in which a cemented carbide tip is attached to a base metal.

  As a high temperature furnace, for example, a chlorination furnace for producing titanium tetrachloride is known. A connecting pipe is connected to the high-temperature furnace, and the flowing gas from the high-temperature furnace is sent to the next process through the connecting pipe. During the feeding of the flowing gas, a part of the flowing gas may react with the material of the connecting pipe, and deposits may adhere to the inner peripheral surface thereof. When deposits accumulate on the connecting pipe, the diameter of the connecting pipe decreases, and as a result, the internal pressure of the high temperature furnace increases.

  For this reason, in order to suppress an increase in the internal pressure of the high-temperature furnace, for example, maintenance is performed every time it operates for a predetermined time to remove deposits, and the diameter of the connecting pipe is kept constant. Since the temperature of the flowing gas flowing through the connecting pipe is as high as about 900 to 1200 ° C., for example, tools used for maintenance (for example, carbide tools) are required to have heat resistance, corrosion resistance, machinability, and the like. The

  As such a cemented carbide tool, a tool comprising a base mounted on a maintenance device, a holding member fixed to the base, and a carbide tip attached to the holding member is known ( For example, see Patent Document 1). In this cemented carbide tool, the cemented carbide tip is attached to the holding member by shrink fitting, for example, by inserting the cemented carbide tip into the housing recess and cooling it while the holding member is heated to around 900 ° C. and expanded. It is attached. In addition, in order to further prevent the carbide chip from being detached, a plurality of recesses are provided on the circumferential surface of the carbide chip, and the holding member is heated to insert the carbide chip into the outer circumferential surface of the holding member. A part of the plastic deformation is plastically deformed by applying pressure, and the plastically deformed part (convex part) is fitted into a plurality of concave parts of the cemented carbide chip.

JP 2012-66363 A

  However, such a carbide tool has the following problems to be solved. When such a cemented carbide tool is used in a high temperature environment of 900 to 1200 ° C., for example, a cemented carbide tip (for example, a mixture of tungsten carbide and cobalt sintered) has a small thermal expansion coefficient and is almost thermally expanded. On the other hand, the holding member (for example, rolled steel) has a large coefficient of thermal expansion, causing thermal expansion. Due to this difference in thermal expansion, the cemented carbide tip easily rotates with respect to the holding member. That is, the engagement state between the convex part on the holding member side and the concave part on the carbide tip side is small (the engagement state is small because the holding member is engaged by plastic deformation), and thermal expansion occurs in a high temperature environment. Due to the difference, the engagement state becomes smaller, and therefore, the engagement state is released and the carbide tip is easily rotated relative to the holding member. Further, in this high temperature environment, the engagement state between the convex portion on the holding member side and the concave portion on the carbide tip side is easily released, so that the possibility that the carbide tip is detached from the holding member is increased.

  An object of the present invention is to provide a cemented carbide tool capable of reliably preventing relative rotation of a cemented carbide tip with respect to a retaining member and detachment from the retaining member.

  Another object of the present invention is to provide a cemented carbide tool capable of reliably preventing relative rotation of the cemented carbide tip with respect to the base metal and detachment from the base metal.

The cemented carbide tool according to claim 1 of the present invention includes a base metal provided with an attachment recess, a holding member provided with the accommodation recess, and a carbide tip attached to the accommodation recess of the holding member. In the carbide tool provided,
The holding member is provided with a mounting through-hole that passes through the receiving recess, the carbide tip is provided with an insertion hole therethrough, and the carbide tip is formed in the receiving recess of the holding member. It is attached to the holding member by attaching a shaft member through the attachment through hole and the insertion hole after being attached, and the holding member is fixed to the base metal after being inserted into the attachment recess. .

  Further, in the cemented carbide tool according to claim 2 of the present invention, the holding member is constituted by a hollow sleeve member, an accommodation recess is provided on a radially inner side of the peripheral side wall of the hollow sleeve member, and the mounting through-hole is The hollow sleeve member is provided so as to penetrate through a portion of the peripheral side wall facing the radial direction.

The cemented carbide tool according to claim 3 of the present invention is a cemented carbide tool including a base metal provided with an attachment recess and a carbide tip attached to the attachment recess.
The base metal is provided with a mounting hole that passes through the mounting recess, the carbide tip is provided with an insertion hole therethrough, and the carbide tip is pivoted through the through hole and the insertion hole. It is attached to the base metal by mounting a member, and the shaft member is fixed to the base metal.

  Furthermore, in the cemented carbide tool according to claim 4 of the present invention, the attachment hole of the base metal further extends from one end opened to the outside through the attachment recess, and the shaft member extends to the one end of the attachment hole. And extending through the insertion hole of the cemented carbide tip, and the end of the shaft member and the base metal are fixed.

  According to the cemented carbide tool of the first aspect of the present invention, the cemented carbide tip is mounted in the receiving recess of the holding member, and then the shaft member is mounted through the mounting through hole and the carbide chip insertion hole. Since it is attached to the holding member, it can be attached to the holding member as required, and the shaft member can reliably prevent the rotation of the carbide tip relative to the holding member. Detachment of the hard tip can be reliably prevented. This holding member is preferably fixed to the base metal by, for example, welding after being inserted into the mounting recess, and when configured in this way, it can be securely fixed by this base metal. It can be used with peace of mind even in a high temperature environment around 900 to 1200 ° C.

  Further, according to the cemented carbide tool according to claim 2 of the present invention, the housing recess is provided on the radially inner side of the peripheral side wall of the hollow sleeve member, and the mounting through hole is provided at a portion facing the radial direction of the peripheral side wall. Since the carbide tip is mounted in the recess of the hollow sleeve member, the carbide chip is held by mounting the shaft member through the mounting through hole of the holding member and the through hole of the carbide chip. It can be easily and reliably attached to the member.

  Further, according to the cemented carbide tool according to claim 3 of the present invention, the shaft member is mounted through the mounting hole of the base metal and the insertion hole of the cemented carbide chip after the cemented carbide chip is mounted in the mounting recess of the base metal. As a result, the carbide tip can be securely attached to the base metal, and the shaft member can reliably prevent the carbide tip from rotating relative to the base metal, and the carbide tip can be detached from the base metal. Can be reliably prevented. The shaft member is preferably fixed to the base metal by, for example, welding. When configured in this way, the shaft member can be securely fixed by the base metal. It can be used with peace of mind even in a high temperature environment around 900 to 1200 ° C.

  Further, according to the cemented carbide tool according to claim 4 of the present invention, the attachment hole of the base metal further extends from one end opened to the outside through the attachment recess, and the shaft member is inserted from one end of this attachment hole. Since it extends through the insertion hole of the cemented carbide tip, the cemented carbide tip can be attached relatively easily and reliably.

The perspective view which shows the principal part in 1st Embodiment of the cemented carbide tool according to this invention. Sectional drawing by the II-II line in FIG. The partial expanded sectional view which expands and shows the cemented carbide tip and its vicinity in the cemented carbide tool of FIG. The expanded sectional view which shows the deformation | transformation form of a cemented carbide tip and a holding member. Sectional drawing which shows the principal part in 2nd Embodiment of the cemented carbide tool according to this invention. The partial expanded sectional view which expands and shows the cemented carbide tip and its vicinity in the cemented carbide tool of FIG. The partial expanded sectional view which expands and shows a part of deformation | transformation form of a base metal.

  Hereinafter, an embodiment of a cemented carbide tool according to the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
First, a cemented carbide tool according to a first embodiment will be described with reference to FIGS. 1 and 2, the illustrated carbide tool 2 includes a base metal 4. The base metal 4 includes a disk-shaped base metal body 6 and a support shaft provided at the center of the base metal body 6. The support shaft 8 is attached to a maintenance device (not shown), and the base metal 4 is rotated in a predetermined direction via the support shaft 8 when maintenance is performed.

  In the illustrated embodiment, four carbide chips 10 are disposed as an example on the outer periphery of the tip of the base body 6 at substantially equal intervals in the circumferential direction. Referring also to FIG. 3, each cemented carbide chip 10 is mounted on a holding member 12, and the holding member 12 is fixed to the base metal body 6. More specifically, the holding member 12 is composed of a hollow cylindrical sleeve member 14, and a housing recess 16 is defined inside the hollow cylindrical sleeve member 14 in the radial direction. In this example, both ends of the housing recess 16 are open. A circular mounting through-hole 20 is provided at a portion of the hollow cylindrical sleeve member 14 facing the radial direction of the peripheral side wall 18 (a portion facing the housing recess 16). Further, the cemented carbide chip 10 is formed in a cylindrical shape corresponding to the shape of the housing recess 16 of the holding member 12, and the distal end portion thereof is formed in, for example, a conical shape whose outer diameter gradually decreases toward the distal end. On the base side of the cemented carbide chip 10, a circular insertion hole 22 corresponding to the attachment through hole 20 of the holding member 12 is provided.

  In this embodiment, the base metal body 6 is made of, for example, carbon steel, stainless steel, etc., the hollow cylindrical sleeve member 14 is made of, for example, rolled steel, stainless steel, or the like, and the carbide tip 10 is made of, for example, tungsten carbide. Cobalt or tungsten carbide and nickel are mixed and sintered.

  The cemented carbide chip 10 is attached to the holding member 12 as follows, for example. Referring mainly to FIG. 3, the base side of the cemented carbide chip 10 is accommodated in the accommodating recess 16 of the holding member 12, and in this state, the shaft member 24 (round bar) is attached to the mounting through hole of the holding member 12. 20 and through the insertion hole 22 of the cemented carbide chip 10, the cemented carbide chip 10 is thus attached to the holding member 12 (hollow sleeve member 14) via the shaft member 24. In this state, the tip side of the cemented carbide tip 10 extends outwardly from one end of the holding member 12 so that the shaft member 24 extends through the holding member 12 and the cemented carbide tip 10. The relative rotation of the carbide tip 10 can be reliably prevented, and the carbide chip 10 can be reliably prevented from detaching from the holding member 12. The shaft member 24 can be formed of, for example, rolled steel, stainless steel or the like similar to the base metal body 6.

  The holding member 12 (hollow sleeve member 14) provided with the carbide tip 10 is attached to the base metal body 6 as follows. Corresponding to the location of the cemented carbide chip 10, a mounting recess 26 is provided at a predetermined location of the base metal body 6. The holding member 14 is inserted into the corresponding mounting recess 26, and in this state, the holding member is inserted. 12 and the base metal body 6 are fixed by welding or the like. For example, when fixed by welding, a strong fixed state is maintained even in a high temperature environment of about 900 to 1200 ° C. Therefore, it can be used for maintenance of a high temperature furnace.

  In such an attachment state, since the shaft member 24 penetrating the holding member 12 and the cemented carbide chip 10 is also inserted into the attachment recess 26, as can be understood from FIG. Accordingly, the carbide tip 10 is not detached from the cemented carbide chip 10. Therefore, in such an attached state, the relative rotation of the carbide tip 10 and its separation are reliably prevented.

  In this embodiment, the holding member 12 is fixed by welding. However, for example, the base metal body 6 may be subjected to caulking processing, and the holding main body 12 may be fixed to the base metal body 6 by caulking. Even with this configuration, a strong fixed state is maintained even in a high temperature environment. An annular groove may be provided in the base metal body 6 and the holding member 12, and a snap ring or the like may be attached and fixed to the annular groove.

  As the holding member, the one shown in FIG. 4 can be used. In FIG. 4, the holding member 12 </ b> A in this modified embodiment is provided with an end wall 32 on the base side of the peripheral side wall 18, and the peripheral side wall 18 and the end wall 32 define an accommodation recess 16 </ b> A that is open on one end side. Other configurations of the holding member 12A are the same as those in the above-described embodiment.

  When such a holding member 12A is used, the carbide chip is mounted by inserting the shaft member 24 through the attachment through hole 20 of the holding member 12A and the insertion hole 22 of the carbide chip 10 in the same manner as described above. 10 is attached to the holding member 12A. The holding member 12A can be attached to the base metal body 6 in the same manner as described above.

[Second Embodiment]
Next, with reference to FIG.5 and FIG.6, the cemented carbide tool of 2nd Embodiment is demonstrated. In the second embodiment, the holding member is omitted, and the shaft member is directly attached to the base metal. In the second embodiment, substantially the same members as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  5 and 6, the cemented carbide tool 2B of the second embodiment includes a base metal 4B, and the base metal body 6B of the base metal 4B is provided with an attachment recess 26B. The mounting recess 26B is provided corresponding to the mounting site of the cemented carbide chip 10, and in this embodiment, similarly to the above-described embodiment, the mounting recess 26B is provided in the distal end portion of the base metal body 6B at intervals in the circumferential direction. (Only two places are shown in FIG. 5).

  The base metal body 6B is provided with mounting holes 42 so as to extend further through the mounting recesses 26B. Each mounting hole 42 has a circular cross section, and extends in a direction substantially perpendicular to the axis of the corresponding mounting recess 26B (that is, the insertion direction of the cemented carbide chip 10), and the distal end surface 44 of the base metal body 6B. 6 extends through the mounting recess 26B diagonally to the lower left in FIG. 6, one end of which is open to the distal end surface of the base metal body 6B, while the other end is embedded in the base metal body 6B.

  The base side of the cemented carbide chip 10 is formed in a cylindrical shape corresponding to the shape of the mounting recess 26B of the base metal body 6B, and the base has a circular cross section corresponding to the shape of the mounting hole 42 of the base metal body 6B. The insertion hole 22 is provided.

  The cemented carbide chip 10 is attached to the base metal body 6B as follows, for example. Referring mainly to FIG. 6, the base side of the cemented carbide chip 10 is inserted into the mounting recess 26 </ b> B of the base metal body 6 </ b> B, and in this state, the shaft member 24 (round bar) is inserted from one end opening into the base metal body. It is mounted through the mounting hole 42 of 6B and the insertion hole 22 of the cemented carbide chip 10, and then the shaft member 24 is fixed to the base metal body 6B. This fixing may be such that the end of the shaft member 24 (the end on the one end opening side of the mounting hole 42) is fixed to the base metal body 6B by welding, or caulking is performed on a part of the base metal body 6B. It may be applied and fixed. When fixed as described above, a strong fixed state can be maintained even in a high temperature environment of about 900 to 1200 ° C.

  In this mounted state, one end side of the shaft member 24 is located on the opening side of the mounting hole 42 of the base metal body 6B (opening side from the mounting recess 26B), and the other end side is the bottom side of the mounting hole 42 (from the mounting recess 26B). The shaft member 24 reliably prevents relative rotation of the carbide tip 10 with respect to the base metal body 6B, and also prevents the carbide tip 10 from being detached from the base metal body 6B. It is surely prevented.

  As shown in FIG. 7, the attachment hole 42C may be provided through a part of the base metal body 6C. In this case, one end side of the mounting hole 42C opens to the front end surface 44 of the base metal body 6C, and the other end side opens to the peripheral side surface 46 of the base metal body 6C. In this case, the carbide chip 10 is inserted into the mounting recess 26C of the base metal body 6C, and in this inserted state, the shaft member 24 is mounted through the mounting hole 42C of the base metal body 6C and the insertion hole 22 of the carbide chip 10; Thereafter, one end of the shaft member 24 is fixed to the distal end surface 44 side of the base metal body 6C by welding (or caulking), and the other end is fixed to the peripheral side surface of the base metal main body 6C by welding (or caulking). .

The above-mentioned cemented carbide tool can be conveniently used in a high-temperature environment such as a high-temperature furnace. it can.
As mentioned above, although the embodiment of the cemented carbide tool according to the present invention was described, the present invention is not limited to such an embodiment, and various changes and modifications can be made without departing from the scope of the present invention.

2,2B Carbide tool 4,4B, 4C Base metal 6,6B, 6C Base metal body 10 Carbide tip 12, 12A Holding member 14 Hollow sleeve member 16, 16A Housing recess 20 Through mounting hole 22 Insertion hole 24 Shaft member 26 , 26B, 26C Mounting recess 42, 42C Mounting hole

Claims (4)

In a cemented carbide tool comprising a base provided with an attachment recess, a holding member provided with the accommodation recess, and a cemented carbide tip attached to the accommodation recess of the holding member,
The holding member is provided with a mounting through-hole that passes through the receiving recess, the carbide tip is provided with an insertion hole therethrough, and the carbide tip is formed in the receiving recess of the holding member. It is attached to the holding member by attaching a shaft member through the attachment through hole and the insertion hole after being attached, and the holding member is fixed to the base metal after being inserted into the attachment recess. Carbide tool. The holding member is formed of a hollow sleeve member, and a housing recess is provided on a radially inner side of the peripheral side wall of the hollow sleeve member, and the attachment through hole is a portion facing the radial direction of the peripheral side wall of the hollow sleeve member The cemented carbide tool according to claim 1, wherein the carbide tool is provided so as to penetrate. In a cemented carbide tool comprising a base metal provided with a mounting recess, and a cemented carbide tip attached to the mounting recess,
The base metal is provided with a mounting hole that passes through the mounting recess, the carbide tip is provided with an insertion hole therethrough, and the carbide tip is pivoted through the through hole and the insertion hole. A carbide tool attached to the base metal by mounting a member, and the shaft member being fixed to the base metal. The mounting hole of the base metal further extends from the one end opened to the outside through the mounting recess, and the shaft member is inserted from the one end of the mounting hole and extends through the insertion hole of the cemented carbide chip, The carbide tool according to claim 3, wherein an end portion of the shaft member and the base metal are fixed.

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