JP3004170B2 - Cleaning device for hollow part of cast camshaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cleaning a hollow portion of a cast camshaft for cleaning an inner surface of a through hole formed in a center portion of the cast camshaft.

[0002]

2. Description of the Related Art In an engine, a camshaft driven to rotate in conjunction with a crankshaft is used as a mechanism for controlling the opening / closing timing of intake and exhaust valves. Since the camshaft is mounted on the cylinder head, an engine having such a valve operating mechanism is called an overhead camshaft (OHC) engine. In some cases, a shell mold casting method is used as a method for manufacturing the camshaft. In this case, in addition to the shell mold for forming the outer shape, a core for forming a through hole at the center of the camshaft is used. Is used. And this core is formed of shell sand similarly to the said mold.

In a camshaft (cast camshaft) formed by shell mold casting as described above, the cam portion is chilled by applying a cooling mold to the cam portion during casting to rapidly cool the cam portion. (Cementitizing) and obtaining a camshaft (chill camshaft) excellent in wear resistance. Prior art documents relating to such a cast camshaft include, for example, JP-A-62-104660.
No. Gazette.

In the above-described cast camshaft, since the center through-hole is formed using the shell mold core, it is required to remove the shell core sand on the inner diameter surface after casting. . The reason is that the presence of foreign matter such as sand components or fine powder on the inner diameter surface makes it difficult to perform high-precision machining when providing grooves and passages for the passage of lubricating oil. Is difficult to obtain. Therefore, in a method of manufacturing a cast camshaft having a center hole, a cleaning (cleaning) step for cleaning the hollow portion after casting is provided to remove shell sand components, dust, and the like from the inner diameter surface. .

[0005]

However, it is difficult to automate the entire process with the conventional apparatus for cleaning a hollow portion of a cast camshaft, and it is difficult to file (grind) the inner surface and remove fine powder (air blow). Since a mechanism for manually operating the cleaning operation is employed, a lot of time is required for the cleaning process, and it is difficult to check the cleaning result (quality).

The present invention has been made in view of such technical problems, and an object of the present invention is to automate a process of cleaning a hollow portion of a cast camshaft and to significantly reduce the number of steps by shortening the process time. An object of the present invention is to provide an apparatus for cleaning a hollow portion of a cast camshaft, which is capable of simultaneously confirming a cleaning result and being extremely effective in improving productivity.

[0007]

In order to achieve the above object, the present invention provides an apparatus for cleaning a hollow portion of a cast camshaft having a through hole in the center thereof, wherein a shaft is provided on a rotary table rotatable about a vertical axis. A jig portion is provided for positioning and holding the casting camshaft in which the through-holes are formed in a posture in which the axis is vertical, and the jig portion includes a support base for supporting a lower end surface of the casting camshaft. And a guide portion for guiding each tool, and a file for performing file sanding of the inner diameter surface of the through hole of the casting camshaft held by the jig portion is provided at a plurality of positions surrounding the rotary table. A head portion, a brush head portion for polishing the inner diameter surface of the through hole with a wire brush, an air blow head portion for removing fine processing powder on the inner diameter surface of the through hole, and a dispensing portion are arranged in a predetermined arrangement. Formed and fixed, while rotating the rotary table intermittently, grinding the inner diameter surface of the through hole with respect to the casting camshaft held by the jig portion, The inner diameter surface is polished, and then fine abrasive powder on the inner diameter surface of the through hole is removed and cleaned, and then the cast camshaft is taken out at the discharging portion.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the apparatus for cleaning a hollow portion of a cast camshaft according to the present invention. In FIG.
A rotary table 3 rotatable about a vertical axis 2 is provided inside the bed 1, and a jig portion 5 for positioning and holding a cast camshaft 4 as a work is provided on the rotary table 3. Have been. Jig part 5
May be provided only at one location, but at a constant angle on the circumference of the same radius from the vertical axis 2 (every 90 degrees in the illustrated example)
May be arranged at a plurality of positions (for example, four positions).

FIG. 2 is a perspective view illustrating a cast camshaft as the work 4. In FIG. 2, a casting camshaft 4 is rotatably supported by a cylinder head (not shown) of the engine and is driven to rotate in synchronization with rotation of a crankshaft (not shown). A plurality of cam portions (circumferential cam surfaces) 6 for regulating opening and closing timings of intake and exhaust valves of the engine are formed at predetermined positions in the axial direction of the camshaft 4. Is formed with a hole 7 penetrating from one end to the other end.

In FIG. 1, the rotary table 3
The rotary table 3 is provided with a jig portion 5 for positioning and holding the casting camshaft 4. That is, the jig portion 5 is configured to position and hold the casting camshaft 4 on the rotary table 3 in a posture in which the axis thereof is vertical. At a position surrounding the rotary table 3 on the bed 1, a dispensing position 8 for mounting and automatically dispensing the work 4 on the jig portion 5, and a center hole 7 for the work 4 held on the jig portion 5. File position 9 for filing (grinding) the inner diameter surface, brush position 10 for polishing the inner diameter surface of the center hole 7 of the work 4 held by the jig part 5 with a wire brush, work held by the jig part 5 An air blow position 11 is set in which compressed air is blown onto the inner diameter surface of the center hole 7 to remove fine processing powder.

In this embodiment, the dispensing position 8, the file position 9, the brush position 10, and the air blow position 11 are divided into four equal positions around the circular table 3 (with the vertical axis 2 as the center). (A position at every circumferential angle of 90 degrees). A chute 12 for dispensing a workpiece is fixed at the dispensing position 8, a file head 13 for performing the file hooking is fixed at the file position 9, and a brush is mounted at the brush position 10. A head section 14 is fixed, and an air blow head section 15 is fixed at the air blow position 11.

FIG. 3 is a side view showing the jig portion 5 on the rotary table 3, FIG. 4 is a partial sectional view taken along line 4-4 in FIG. 3, and FIG. FIG. 5 is a partial sectional view taken along line 5-5. In FIG. 3, the jig portion 5 is positioned and fixed at a position deviated from the rotation center C on the rotary table 3, and the jig portion 5 includes a jig body 16, an upper holder 17, a lower holder 18, and an upper portion. Positioning block 19, lower positioning block 20, and support 21
And a bush 22.

The upper holder 17 is formed of an elastic member (leaf spring member) as shown in FIG. 4, and the cast camshaft (work) 4 is detachably held by elastic force.
The lower holder 18 has substantially the same structure as the upper holder 17. The upper positioning block 1
Reference numeral 9 denotes a member having a shape as shown in FIG. 5, and the casting camshaft (work) 4 is positioned by a positioning block 19. The lower positioning block 20 has substantially the same structure as the upper positioning block 19.

The support base 21 supports the lower end surface of the casting camshaft (work) 4 and regulates the vertical position of the casting camshaft 4. The bush 22
Are various rod-shaped tools (files, air brushes,
Air blow nozzle).
The jig body 16 is provided with an air cylinder 23 for dispensing a work. The air cylinder 23 is activated when the rotary table 3 reaches the dispensing position 8 (FIG. 1) after the rotary table 3 is sequentially stopped at each rotation position and the processing steps for the casting camshaft 4 described later are completed. This automatically discharges the casting camshaft 4 through the chute 12.

FIG. 6 is an elevational view showing the file head 13 in FIG. The file head section 13 performs a file applying step of grinding the inner diameter surface of the through hole by inserting a rotating file rod into the through hole 7 of the casting camshaft 4 held by the jig section 5 while rotating. Is what you do.
6, two vertically extending left and right slide shafts 25 are fixed to a column 24 installed on the bed 1, and an air cylinder 26 is provided in a vertical position at an intermediate position between the left and right slide shafts 25 of the column 24. Installed.

A mounting head 27 is slidably (up and down) freely fitted to the left and right slide shafts 25,
The tip of the piston rod 28 of the air cylinder 26 is connected to the mounting head 27, and the operation of the air cylinder 26 allows the vertical movement and the vertical position of the mounting head 27 to be controlled. On the mounting head 27, an air drill 29 and a file rod 30 driven to rotate by the air drill are mounted. When the casting camshaft 4 on the rotary table 3 is in the file position 9, the file rod 30 is inserted into the through hole 7 of the casting camshaft 4 through the bush 22 by lowering the mounting head 27. It is mounted in the position and posture that will be performed.

FIG. 7 is an elevational view showing the brush head section 14 in FIG. The brush head portion 14 is inserted into the through-hole 7 of the casting camshaft 4 held by the jig portion 5 and subjected to the above-mentioned filing (grinding) step while rotating a rod-shaped wire brush. This is to execute a wire brush step for polishing the inner diameter surface of the through hole 7. In FIG. 7, two right and left slide shafts 32 extending vertically are fixed to a support 31 installed on the bed 1, and an air cylinder 33 is provided in a vertical position at an intermediate position between the left and right slide shafts 32 of the support 31. Installed.

A mounting head 34 is slidably (up and down) freely fitted to the left and right slide shafts 32.
The distal end of the piston rod 35 of the air cylinder 33 is connected to the mounting head 34, and the vertical movement and the vertical position of the mounting head 34 can be controlled by the operation of the air cylinder 33. An air drill 36 and a rod-shaped wire brush 37 that is driven to rotate by the air drill 36 are mounted on the mounting head 34. In the wire brush 37, the casting camshaft 4 on the rotary table 3 is positioned at the brush position 1
0, the mounting cam 34 is lowered so that the casting camshaft 4
Is mounted in a position and orientation to be inserted into the through-hole 7 of the above.

FIG. 8 shows the air blow head 15 shown in FIG.
FIG. This air blow head 15
Is a through-hole 7 of the casting camshaft 4 held by the jig portion 5 and having completed the above-described wire brush step (polishing step).
An air blow process is performed to remove fine abrasive powder attached to the inner diameter surface by sanding or wire brushing by spraying jet air (air jet) onto the inner diameter surface of the inner diameter surface. Is what you do. This air blowing step is performed by inserting a rod-shaped air ejection nozzle into the through hole 7 of the casting camshaft (work) 4.

In FIG. 8, two slide shafts 3 extending left and right extending up and down are provided on a support 38 installed on the bed 1.
9 are fixed, and the left and right slide shafts 3
An air cylinder 40 is attached to an intermediate position of 9 in a vertical posture. A mounting head 41 is slidably (up and down) freely fitted to the left and right slide shafts 39, and a tip of a piston rod 42 of the air cylinder 40 is connected to the mounting head 41. It is configured such that the vertical movement and vertical position of the mounting head 41 can be controlled by the operation of 40.

A rod-shaped air blow nozzle 43 is mounted on the mounting head 41, and a flexible tube 45 for supplying compressed air is connected to the air blow nozzle 43 via a joint 44. When the casting camshaft 4 on the rotary table 3 is at the air blowing position 11, the air blow nozzle 43 lowers the mounting head 41, so that the casting camshaft 4 passes through the bush 22 in the through hole 7 of the casting camshaft 4. It is attached in the position and posture to be inserted into

Next, the operation of cleaning the hollow portion (the inner diameter surface of the through hole 7) of the casting camshaft (work) 4 by the equipment shown in FIGS. 1 to 8 will be described. The cast camshaft 4 (FIG. 2) formed by the shell mold casting method is positioned and mounted by manually pushing it into the jig portion 5 located at the dispensing position 8. Positioning and mounting of the casting camshaft 4 is as shown in FIGS.
Is held at a predetermined position on the rotary table 3 by upper and lower holders 17 and 18, upper and lower positioning blocks 19 and 20, and a support 21. Hereinafter, the processing operation for this one cast camshaft 4 will be described.

Next, when the rotary table 3 is turned by 90 degrees in the direction of arrow R and stopped, the casting camshaft 4 held by the jig 5 is moved to a file position 9 as shown in FIG.
Is set to Then, while operating the air drill 29 to rotate the file rod 30 and operating the air cylinder 26 to lower the mounting head 27, the file rod 30 is inserted into the through-hole 7 of the casting camshaft 4 to be inserted. Go and file it. Due to this filing, the inner diameter surface of the through hole 7 is ground to a predetermined inner diameter (for example, from 10.5 mm to 12 mm in diameter), whereby the shell core sand on the inner diameter surface of the through hole 7 is shaved off. It is.

When the above file is hooked, the rotary table 3 is further rotated by 90 degrees in the direction of arrow R and stopped, and the cast camshaft 4 on the jig 5 where the above file is hooked is shown in FIG. Set at brush position 10 as shown. Then, by operating the air drill 36 to rotate the rod-shaped wire brush 37 and operating the air cylinder 33 to lower the mounting head 34, the wire brush 37 is inserted into the through hole 7 of the casting camshaft 4. Then, a brushing process (polishing) of the inner surface of the through hole 7 is performed. By this operation, the inner diameter surface of the through hole 7 is polished to a predetermined inner diameter.

When the above polishing is completed, the rotary table 3 is further rotated by 90 degrees in the direction of arrow R and stopped, and the cast camshaft 4 on the jig 5 which has been polished is shown in FIG. It is set at such an air blow position 11. The air blow nozzle 43 is inserted into the through hole 7 of the casting camshaft 4 by operating the air cylinder 40 and lowering the mounting head 41 while ejecting air from the rod-shaped air blow nozzle 43. Then, fine powder such as grinding powder and polishing powder in the through-hole 7 is removed by air jet to clean the inner diameter surface. By cleaning this inner diameter surface, it is possible to easily and precisely process an oil groove, an oil hole, and the like in the cast camshaft 4.

When the above-described air blow process is completed, the rotary table 3 is further rotated by 90 degrees in the direction of arrow R and stopped, and the casting camshaft 4 on the jig 5 is moved to the dispensing position 8 shown in FIG. The cast camshaft 4 is automatically pushed out of the jig section 5 by setting and operating the work discharging air cylinder 23 mounted on the jig section 5. The cast camshaft 4 extruded from the jig portion 5 is taken out of the chute 12 (FIG. 1) to the outside (for example, a work receiving cart or the like). In addition, another cast camshaft 4
In contrast, when performing the above-described cleaning process, a new casting camshaft 4 is manually attached to the jig portion 5 at this payout position,
The above steps are repeated.

According to the embodiment described above, when machining a cast camshaft such as a chill camshaft having a core hole, shell core sand and fine abrasive powder are easily removed from the inner diameter surface of the core hole. And can be reliably cleaned and removed,
It is possible to automatically and stably obtain a cast camshaft capable of easily processing a precise oil hole or oil groove. The equipment (apparatus) for cleaning the hollow portion of the cast camshaft shown in FIG. 1 may be portable by attaching a caster wheel or the like to the bottom surface of the bed.

[0028]

As is apparent from the above description, according to the present invention, in the apparatus for cleaning a hollow portion of a cast camshaft having a through hole in the center, the shaft is mounted on a rotary table rotatable about a vertical axis. A jig portion is provided for positioning and holding the casting camshaft in which the through-holes are formed in a posture in which the axis is vertical, and the jig portion includes a support base for supporting a lower end surface of the casting camshaft. And a guide portion for guiding each tool, and a file for performing file sanding of the inner diameter surface of the through hole of the casting camshaft held by the jig portion is provided at a plurality of positions surrounding the rotary table. A head portion, a brush head portion for polishing the inner diameter surface of the through hole with a wire brush, an air blow head portion for removing fine processing powder on the inner diameter surface of the through hole, and a dispensing portion are provided in a predetermined arrangement. While rotating the rotary table intermittently, grinding the inner surface of the through hole with respect to the casting camshaft held by the jig, Polish the inner surface of
Next, the fine polishing powder on the inner surface of the through hole is removed and cleaned, and then the casting camshaft is configured to be taken out at the dispensing section. Therefore, the process of cleaning the hollow portion of the casting camshaft is automated. In addition, it is possible to significantly reduce the man-hours by shortening the process time, to simultaneously check the cleaning result, and to provide a casting camshaft hollow portion cleaning apparatus which is extremely effective in improving productivity.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an apparatus for cleaning a hollow portion of a cast camshaft according to the present invention.

FIG. 2 is a perspective view illustrating a cast camshaft.

FIG. 3 is an elevational view showing a jig for positioning and holding a casting camshaft on a rotary table in FIG. 1;

FIG. 4 is a partial sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a partial sectional view taken along line 5-5 in FIG. 3;

FIG. 6 is an elevation view showing a file head in FIG. 1;

FIG. 7 is an elevation view showing a brush head unit in FIG. 1;

FIG. 8 is an elevational view showing an air blow head section in FIG. 1;

[Description of Signs] 1 Bed 3 Rotary table 4 Cast camshaft (work) 5 Jig part 6 Cam part 7 Through hole (center hole) 8 Discharge position 9 File position 10 Brush position 11 Air blow position 12 Chute 13 File head 14 Brush Head 15 Air Blow Head 16 Jig Main Body 17 Upper Holder 18 Lower Holder 19 Positioning Block 20 Positioning Block 22 Guide (Bushing) 23 Driving Means (Air Cylinder for Discharging Work) 26 Air Cylinder 27 Mounting Head 29 Air Drill 30 File rod 33 Air cylinder 34 Mounting head 36 Air drill 37 Bar-shaped wire brush 40 Air cylinder 41 Mounting head 43 Air blow nozzle

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takashi Kajikawa 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Inside the Akashi factory (56) References JP-A-63-16083 (JP, A) ( 58) Field surveyed (Int.Cl. ⁷ , DB name) B23P 17/00 B23D 67/06 B24B 29/00 B23Q 39/04

Claims (1)

(57) [Claims] An apparatus for cleaning a hollow portion of a casting camshaft having a through hole at a center portion, wherein a casting camshaft having an axial through hole formed on a rotary table rotatable about a vertical axis is provided with an axial center. A jig part for positioning and holding in a vertical position is provided, and the jig part is provided with a support base for supporting a lower end surface of the casting camshaft and a guide part for guiding each tool. At a plurality of positions surrounding the rotary table, a file head for filing the inner surface of the through hole of the casting cam shaft held by the jig portion, and an inner surface of the through hole with a wire brush. A brush head portion to be polished, an air blow head portion for removing fine processing powder on the inner surface of the through hole, and a dispensing portion are fixed in a predetermined arrangement, and the rotary table is fixed. While driving missing rotated,
For the cast camshaft held by the jig portion, the inner surface of the through hole is ground, then the inner surface of the through hole is polished, and then the fine polishing on the inner surface of the through hole is performed. An apparatus for cleaning a hollow portion of a cast camshaft, wherein the device is cleaned by removing powder, and then the cast camshaft is taken out at the payout section.