JP5774871B2 - Hardening equipment for bar workpiece - Google Patents

Description

  The present invention relates to a rod-shaped workpiece quenching apparatus that performs quenching while moving the rod-shaped workpiece in the axial direction.

When quenching a long rod-shaped workpiece such as a ball screw, the rod-shaped workpiece is moved in the axial direction, and a heating unit that performs induction heating arranged along the moving direction and cooling using a quenching coolant. There is known an apparatus that performs heating and cooling in a section and sequentially performs a quenching process along the longitudinal direction of the rod-shaped workpiece (for example, Patent Documents 1 to 4).
In these apparatuses, the heating part and the cooling part are unitized, and a unit wall is arranged between them, or a shielding plate is arranged to give the processing independence. The unit wall and the shielding plate are formed with a passage hole having a size that matches the outer shape of the rod-shaped workpiece, and the rod-shaped workpiece can be moved through the passage hole. By forming the passage hole with a size approximately along the outer shape of the rod-shaped workpiece, the gap between the passage-shaped workpiece and the rod-shaped workpiece can be reduced to allow the rod-shaped workpiece to pass without resistance.

Japanese Patent Publication No.58-28335 Japanese Utility Model Publication No. 5-22545 JP-A-4-289123 JP 2002-60833 A

However, in the above-described heat treatment, the heat treatment and the cooling treatment are performed in close proximity, and the above-described unit wall and shielding plate cannot sufficiently block the coolant. For this reason, there is a problem that the coolant used on the cooling unit side enters the heating unit side and comes into contact with the surface of the heated rod-shaped workpiece, causing roughness on the surface and reducing the appearance quality of the rod-shaped workpiece. is there.
On the other hand, the penetration | invasion to the heating part side of a cooling fluid can be made small by making the passage hole provided in the unit wall and the shielding board small, and making a clearance gap with a rod-shaped workpiece | work small as much as possible. However, the unit wall and the shielding plate are made of a rigid material, and the resistance to movement greatly increases when it comes into contact with the rod-shaped workpiece, so there is a limit to reducing the gap between the passage hole and the rod-shaped workpiece, The intrusion of the cooling liquid has not been effectively prevented.

  The present invention has been made against the background of the above circumstances, and can reliably prevent the surface quality of the rod-shaped workpiece from being deteriorated by the quenching coolant by reliably blocking the heating portion side and the cooling portion side. An object of the present invention is to provide a quenching apparatus.

That is, in the quenching apparatus for quenching the rod-shaped workpiece having the same outer shape along the axial direction, the first present invention among the quenching devices for the rod-shaped workpiece of the present invention,
A workpiece drive unit that moves the rod-shaped workpiece in the axial direction, a heating unit that induction-heats the rod-shaped workpiece, and a cooling unit that cools the rod-shaped workpiece heated by the heating unit,
The heating unit and the cooling unit are disposed along the moving direction of the rod-shaped workpiece, and a partition plate that separates the heating unit and the cooling unit is disposed between the heating unit and the cooling unit. And
The partition plate is larger than the outer shape of the rod-shaped workpiece and has a gap between the rod-shaped workpiece moving in the axial direction so as to reduce a coolant used in the cooling unit from entering the heating unit. However, a partition passage hole that passes without causing movement resistance is formed,
A shielding plate is provided on a plate surface on the heating unit side of the partition plate, and the shielding plate is formed with a shielding passage hole through which the rod-shaped workpiece moving in the axial direction passes while closely contacting the outer periphery, and the partition The plate and the shielding plate jointly prevent the coolant used in the cooling unit from entering the heating unit side .
The quenching apparatus for a rod-shaped workpiece according to the second aspect of the present invention, in the first aspect of the present invention, the heating unit has a protective cylinder through which the rod-shaped workpiece that moves in the axial direction passes.
The protective cylindrical body is provided with a protective cap having a passage hole matched with the outer peripheral shape of the rod-shaped workpiece at the introduction side end of the rod-shaped workpiece, and the shielding plate has no gap at the movement-destination side end of the rod-shaped workpiece. It is arranged.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the shielding plate has flexibility.
According to a fourth aspect of the present invention, there is provided a quenching apparatus for a bar-shaped work according to any one of the first to third aspects, wherein the shielding plate is formed of a rubberized multilayer in which heat-resistant materials are laminated. .
The rod-like workpiece quenching apparatus according to the fifth aspect of the present invention is characterized in that, in any one of the first to fourth aspects of the present invention, the cooling section uses a coolant.
According to a sixth aspect of the present invention, there is provided a quenching apparatus for a bar-shaped work according to any one of the first to fifth aspects of the present invention, wherein the bar-shaped work is a ball screw.

That is, according to the present invention, the partition plate and the shielding plate jointly block the heating unit and the cooling unit, and the coolant (particularly the coolant) used in the cooling unit enters the heating unit side. Is effectively prevented.
In the present invention, the partition passage hole formed in the partition plate is formed to be larger than the outer shape of the rod-shaped workpiece, and the rod-shaped workpiece passes through the partition passage hole with a gap. Will not occur. Therefore, the partition plate is given rigidity to enable stable shielding. If the partition plate is not rigid and the partition position becomes unstable, the coolant easily enters the heating unit side.

  Further, since the outer periphery of the rod-shaped workpiece passes through the shielding passage hole formed in the shielding plate, the coolant is surely prevented from entering the heating unit side. The shielding plate is provided on the partition plate, and when the bar-shaped work passes, the close contact portion is bent and the close contact can be maintained high. Therefore, a flexible material is desirable for the shielding plate. Moreover, since a shielding board is exposed to the area at the side of a heating part, it needs to have heat resistance. For example, a material that does not soften or cause thermal cracking even at 400 ° C. is preferably selected. For the shielding plate, for example, a rubberized multilayer material in which heat-resistant materials are laminated can be used. Examples of the material include rubberized glass cloth.

  In addition, when the rod-shaped workpiece passes through the heating section, it is desirable that the rod-shaped workpiece move in a protective cylinder covering the outer periphery of the rod-shaped workpiece so that the heating atmosphere is maintained in a stable state. The protective cylinder is made of a heat-resistant material such as quartz. Further, a protective cap is provided at the end of the protective cylinder on the rod-shaped workpiece introduction side, and a passage hole is formed in the protective cap according to the outer shape of the rod-shaped workpiece. The passage hole is preferably formed so that the rod-shaped workpiece passes through the gap as small as possible or passes through without any gap. It is also possible to dispose a seal member on the inner surface of the passage hole so as to eliminate the gap. By placing the end of the protective cylinder on the rod-shaped workpiece introduction side behind the end of the heating unit or behind the heating unit, the heat effect of the heating unit is small, and therefore the seal member also requires exceptional heat resistance. However, the material can be selected with an emphasis on sealing performance.

  Further, it is desirable that the shielding plate is in contact with the protective cylinder without any gap at the end of the protective cylinder on the side of the rod-shaped workpiece movement destination. Thereby, the inside of the protective cylinder is made into a substantially closed space by the protective cap and the shielding plate, and the internal space is brought close to the non-oxidized state. As a result, when the rod-shaped workpiece moving within the protective cylinder is heated, the rod-shaped workpiece surface can be prevented from being oxidized and moved to the cooling section while maintaining a good surface state.

The rod-shaped workpiece has the same outer shape along the axial direction, and may have an appropriate concave shape on the surface as long as the outer shape is the same. The rod-like workpiece may be a rod itself or may have a spiral outer shape like a ball screw.
The workpiece drive unit that moves the rod-shaped workpiece may be any device that can move the rod-shaped workpiece in the axial direction, and the movement itself may be continuous or intermittent, and may include backward movement. Moreover, when processing a ball screw etc., you may advance, rotating a rod-shaped workpiece.

  As described above, according to the rod-shaped workpiece quenching apparatus of the present invention, the coolant used in the cooling section is effectively prevented from entering the heating section, and the surface quality of the rod-shaped workpiece is maintained well. can do. By attaching a layered shielding plate, it becomes possible to produce with a markedly improved quality and stable quality.

It is the front view which carried out the section which shows some hardening devices of one embodiment of the present invention. Similarly, it is a side view showing a shielding plate. Similarly, it is the front view which carried out the section which shows the state which moves a ball screw. Similarly, it is the side view which carried out the cross section of a part which shows a heating part.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view showing an embodiment of a stick work hardening apparatus 1 of the present invention.
The quenching apparatus 1 cools the work screw drive unit 2 that moves the ball screw 100 that is a rod-shaped work in the axial direction, the heating unit 3 that induction heats the ball screw 100, and the ball screw 100 that is heated using a coolant. The cooling unit 4 is provided, and the heating unit 3 and the cooling unit 4 are arranged along the moving direction of the ball screw 100.

The work driving unit 2 moves the ball screw 100 in the axial direction while rotating the ball screw 100, and the moving mechanism is not particularly limited in the present invention.
The heating unit 3 includes a bowl-shaped heating coil 30 that performs induction heating from the outer peripheral side of the moving ball screw 100, and a protective cylinder 31 through which the ball screw 100 passes is disposed on the inner peripheral side of the heating coil 30. ing. The protective cylinder 31 has a slightly longer axial length on both sides than the heating coil 30, and the end portion on the side where the ball screw 100 is introduced is inserted into the mounting hole 34 of the holding plate 33, and its end A protective cap 32 is attached to the part opening. The protective cylinder 31 and the protective cap 32 are made of quartz having good heat resistance. The protective cap 32 has a passage hole 32 a through which the ball screw 100 can pass, and the passage hole 32 a has substantially the same hole diameter as the outer shape of the ball screw 100.

  The cooling unit 4 has a cooling jacket 40 positioned on the outer peripheral side of the ball screw 100 moving in the axial direction, and a cooling liquid is supplied as a quenching liquid toward the inner peripheral side on the inner peripheral side of the cooling jacket 40. A cooling liquid ejecting portion 41 is ejected.

A partition plate 5 is disposed between the heating unit 3 and the cooling unit 4 and is attached to the apparatus frame 10 via a spacer 11. The partition plate 5 is composed of a silicon glass laminated plate.
The spacer 11 separates the partition plate 5 from the end of the protective cylinder 31 by the thickness of the spacer 11. A coil attachment frame 12 is attached to the apparatus frame 10, and the heating coil 30 is attached to the coil attachment frame 12.
The partition plate 5 has a partition passage hole 50 having a diameter larger than the outer shape of the ball screw 100, and the partition plate 5 is disposed so as to be coaxial with the ball screw 100 to which the partition passage hole 50 moves. Yes.

A shielding plate 6 is attached to the surface of the partition plate 5 on the heating unit 3 side. The shielding plate 6 is made of a rubberized glass cloth in which a glass cloth, which is a heat resistant material, and a rubber are laminated, and the heat resistance does not cause softening or cracking even at 400 ° C.
The shielding plate 6 is provided with mounting plates 61 (four in FIG. 2) on the surface on the heating unit 3 side so as to be positioned on the outer peripheral side of the protective cylinder 31, and the shielding plate 6 is attached to the mounting plate 61. It is being fixed to the partition plate 5 with the volt | bolt 62 via. Thereby, on the outer peripheral side of the protective cylinder 31, the shielding plate 6 is securely attached while being pressed against the partition plate 5. The shielding plate 6 has a shielding passage hole 60 formed coaxially with the partition passage hole 50. The shield passage hole 60 has substantially the same hole diameter as the outer shape of the ball screw 100, and the hole diameter is slightly smaller than the maximum outer diameter of the ball screw 100.
The advancing direction side end portion of the ball screw 100 of the protective cylinder 31 is in contact with the surface of the shielding plate 6 on the heating unit 3 side without a gap.

  Bolts 35, 35 are bridged between the upper side of the holding plate 33 and the upper side of the shielding plate 6, the lower side of the holding plate 33 and the lower side of the partition plate 5, and the holding plate 33 and the partition plate 5. The shielding plate 6 is fixed.

Next, the operation of the bar-shaped workpiece quenching apparatus 1 will be described.
The ball screw 100 is disposed along the longitudinal direction of the rod-shaped workpiece hardening apparatus 1, and is moved in the axial direction of the ball screw 100 while rotating the ball screw 100 along the screw direction of the ball screw 100 by the work driving unit 2.
In the heating unit 3, the heating coil 30 is energized, and the portion of the ball screw 100 that reaches the heating unit 3 moves through the protective cylinder 31 through the passage hole 32 a of the protective cap 32 and is generated by the heating coil 30. It is inductively heated by electromagnetic waves and reaches a predetermined temperature. At this time, the ball screw 100 moves forward from the passage hole 32a to the shielding passage hole 60 of the shielding plate 6 on the other end side of the protection cylinder body 31 to make the inside of the protection cylinder body 31 almost non-oxidized.

The portion of the ball screw 100 that has passed through the protective cylinder 31 reaches the cooling unit 4 through the shielding passage hole 60 and the partition passage hole 50 in a heated state. At this time, the outer peripheral surface of the ball screw 100 and the shielding passage hole 60 are in close contact with each other over the entire circumference, and the outer periphery of the ball screw 100 covers the inner surface of the shielding passage hole 60 while the shielding plate 6 around the shielding passage hole 60 is bent. Move while sliding. By moving the ball screw 100 while keeping the shield passage hole 60 and the outer periphery of the ball screw 100 in close contact with each other, the cooling unit 4 and the heating unit 3 are reliably blocked.
In the cooling unit 4, the heated portion of the ball screw 100 reaches the inner peripheral side of the cooling jacket 40, and the ball screw 100 is rapidly cooled from the surface side by the cooling liquid ejected from the cooling liquid ejecting unit 41 and quenched. At this time, since the close contact state between the ball screw 100 and the shield passage hole 60 is maintained throughout, the coolant does not enter the heating unit 3 side, and quenching is performed while keeping the surface quality of the ball screw 100 good. Processing can be performed.
By continuing the above process, the ball screw 100 can be heat-treated along the axial direction.

  Although the present invention has been described based on the above embodiment, the present invention is not limited to the description of the above embodiment, and appropriate modifications are possible without departing from the scope of the present invention. .

DESCRIPTION OF SYMBOLS 1 Bar-shaped workpiece hardening apparatus 2 Work drive part 3 Heating part 30 Heating coil 31 Protective cylinder 32 Protective cap 4 Cooling part 40 Cooling jacket 41 Coolant ejection part 5 Partition plate 50 Partition passage hole 6 Shield plate 60 Shield passage hole 100 Ball screw

Claims (6)

In a quenching apparatus for quenching a rod-shaped workpiece having the same outer shape along the axial direction,
A workpiece drive unit that moves the rod-shaped workpiece in the axial direction, a heating unit that induction-heats the rod-shaped workpiece, and a cooling unit that cools the rod-shaped workpiece heated by the heating unit,
The heating unit and the cooling unit are disposed along the moving direction of the rod-shaped workpiece, and a partition plate that separates the heating unit and the cooling unit is disposed between the heating unit and the cooling unit. And
The partition plate is larger than the outer shape of the rod-shaped workpiece and has a gap between the rod-shaped workpiece moving in the axial direction so as to reduce a coolant used in the cooling unit from entering the heating unit. However, a partition passage hole that passes without causing movement resistance is formed,
A shielding plate is provided on a plate surface on the heating unit side of the partition plate, and the shielding plate is formed with a shielding passage hole through which the rod-shaped workpiece moving in the axial direction passes while closely contacting the outer periphery, and the partition The plate and the shielding plate jointly prevent the coolant used in the cooling unit from entering the heating unit, and hardening the rod-shaped workpiece. The heating unit has a protective cylinder through which the rod-shaped workpiece moving in the axial direction passes,
The protective cylindrical body is provided with a protective cap having a passage hole matched with the outer peripheral shape of the rod-shaped workpiece at the introduction side end of the rod-shaped workpiece, and the shielding plate has no gap at the movement-destination side end of the rod-shaped workpiece. The stick work hardening apparatus according to claim 1, wherein the hard work apparatus is disposed.   The bar-shaped workpiece hardening apparatus according to claim 1, wherein the shielding plate has flexibility.   The rod-shaped workpiece hardening apparatus according to any one of claims 1 to 3, wherein the shielding plate is made of a rubberized multilayer in which heat-resistant materials are laminated.   The said cooling part uses a cooling fluid, The hardening apparatus of the rod-shaped workpiece | work in any one of Claims 1-4 characterized by the above-mentioned.   The rod-shaped workpiece hardening apparatus according to claim 1, wherein the rod-shaped workpiece is a ball screw.

Images