JP2594090B2 - Head cylinder processing method - Google Patents

Description

The present invention relates to a head cylinder processing method applied to obtain a head cylinder having a constant chamber volume.

(Prior Art) Generally, a head cylinder is manufactured using a mold.

(Problems to be Solved by the Invention) By the way, it is known that the chamber volume of the head cylinder greatly affects the engine performance. On the other hand, the mold changes over time, and the head height and the height of the valve seat surface may vary due to processing and the like. As a result, the chamber volume of the resulting head cylinder is not an appropriate value, and the engine performance However, there is a problem that the temperature is reduced. To solve this problem, it is conceivable to modify the mold at regular intervals and manufacture the head cylinder with the modified mold. However, in this method, a head cylinder having an appropriate chamber volume cannot be continuously obtained, and a variation in processing cannot be corrected. In addition, it is conceivable to integrate a spacer for accessories such as a spark plug into the head cylinder so that the chamber volume becomes an appropriate value. However, this method requires much time and effort and is not very realistic. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a head cylinder processing method capable of continuously obtaining a head cylinder having a constant chamber volume without any trouble.

(Means for Solving the Problems) In order to achieve the above object, the present invention measures a chamber volume of a head cylinder, compares the measured amount with a preset reference value, and sets the head based on the comparison result. The gist is to cut the lower surface of the cylinder.

In measuring the chamber volume, for example, as shown in FIG. 1, the head cylinder 80 is first pressed against the masking jig 18, the three-way valves 15, 17 are closed, and the valves 13, 14 are opened to open the tank.
Air is supplied at a predetermined pressure to 11, 12 and thereafter, the three-way valves 15, 17 are opened, the differential pressure is detected by the differential pressure gauge 20, and the volume measurement sensor 21 calculates the volume based on the differential pressure detection signal. You may do so.

In cutting the lower surface of the head cylinder, for example, as shown in FIG. 1 and FIG.
, The reference volume data A is read out from the controller, the two are compared, the cutter cutting amount k is calculated based on the comparison result, and the cutter 62 is raised and set to the position corresponding to the value k, and the position is set as described above. The cutter 62 may be rotated and advanced toward the head cylinder 80 to cut the lower surface portion 81 of the head cylinder 80 by the thickness k.

(Operation) According to the present invention, a head cylinder having a constant volume of the head chamber can be continuously obtained by the above configuration, and the engine performance is not reduced by keeping the volume of the head chamber constant.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a piping diagram showing a chamber volume measuring apparatus to which an embodiment of the present invention is applied, and FIG. 2 is a block diagram showing a chamber volume correcting system to which the embodiment is applied.

In FIG. 1, tanks 11 and 12 have the same volume and are connected to an air supply pump (not shown) via valves 13 and 14, respectively. A master tank 16 having a predetermined volume is connected to the tank 11 via a three-way valve 15. tank
A plate-shaped masking jig 18 is connected to 12 via a three-way valve 17. A through hole 19 is provided at the center of the masking jig 18.
Are formed, and this portion is a connection portion with the tank 12.

A differential pressure gauge 20 is provided between the three-way valves 15 and 17. Differential pressure gauge 2
0 detects a differential pressure between the three-way valves 15 and 17. A volume measurement sensor 21 is connected to the differential pressure gauge 20. The volume measurement sensor 21
Characteristic data indicating the relationship between pressure and volume is stored in advance, and when a differential pressure detection signal is received from the differential pressure gauge 20, the volume is calculated based on this signal, and this is output as an analog signal.

In this embodiment, four sets of the chamber volume measuring devices configured as described above are provided so that the chamber volumes of the head cylinder in which the four chambers are formed can be simultaneously measured. In this case, the masking jig 18 having four through holes 19 may be used.

In FIG. 2, an amplifier 41 for amplifying an analog signal indicating the volume obtained by the volume measurement sensor 21 is connected to the volume measurement sensor 21, and the amplifier 41 converts an output signal of the amplifier 41 into a digital signal. The / D converter 42 is connected. A data processing device 43 is connected to the A / D converter. The data processing device 43 executes a control program stored in a memory (not shown), fetches a signal indicating a volume via the A / D converter 42, reads stored data from the memory 44, and compares the read data. A control signal is generated and output based on the result. The memory 44 stores reference volume data A described later.
Is stored.

The data processing device 44 is connected to a programmable controller 45 that controls each unit described below based on a control signal of the data processing device 43. The programmable controller 45 includes a cutter device driving unit 46, a milling unit driving unit 47, and a cutter. The pedestal driving means 48 is connected.

The cutter base driving means 48 includes a vertical motor 49 and a motor.
The ball screw 50 is driven by 49.

A cutter pedestal 60 is screwed to the ball screw 50.
When the motor 49 is operated by the programmable controller 45 and the ball screw 50 is rotated, the cutter base 60 is moved up and down.

The cutter pedestal 60 is provided with a cutter 62 having a chip 61 provided on an upper surface thereof, and a milling unit 70 mounted thereon as shown in FIG. 3a.

The milling unit 70 is disposed slidably in an end face measuring head 71 provided upright on the cutter pedestal 60, and a hollow portion of the end face measuring head 71, and is substantially moved up and down by the milling unit driving means 47. L-shaped rod 72,
A positioning table 73 attached to the tip of the rod 72, and an MT pulser disposed on the upper surface of the positioning table 73 and capable of moving up and down.
74 and.

In this embodiment, the cutter pedestal 60 and the cutter pedestal driving means 48 are mounted on the same pedestal, and this pedestal is moved in the left-right direction by the cutter device driving means 46. The head cylinder 80 fixed at a predetermined position is cut by rotating the cutter 62 during the movement of the pedestal.

In this case, a case where a head cylinder 80 configured as shown in FIG. 4 is applied will be described as an example. The head cylinder 80 has a substantially rectangular plate shape, and four head chambers 82 are formed in a row on a lower surface portion 81 thereof. The rough material surface 83 forming the head chamber 82 is formed so as to be recessed by a length 1 from a position indicated by a dotted line 84. In addition,
In this case, the reference volume data A is set at the position indicated by the dotted line 84, and the reference volume data A is stored in the memory 44 in advance. A valve seat 85 is provided at the bottom of the head chamber 82. Note that a sealing washer is inserted in advance into the valve hole 86 formed in the valve seat 85 prior to the measurement so that the portion is not included in the chamber volume.

An embodiment of the method of the present invention applied to the chamber volume measuring apparatus and the chamber volume correcting system configured as described above will be described below.

First, a sealing washer is inserted into the valve hole 86, and thereafter, the head cylinder 80 is placed in the through hole 19 as shown in FIG.
To seal the head chamber 82.

Next, the three-way valves 15 and 17 are closed, and in this state, the valves 13 and 14 are opened to operate the air supply pump to supply air of the same pressure to the tanks 11 and 12.

Subsequently, the valves 13 and 14 are closed. Thereafter, the three-way valves 15 and 17 are opened, and a space having a volume V _M is provided between the tank 11 and the master tank 16, and a space having a volume V _W is provided between the tank 12 and the head chamber 82. Is formed. Then, the differential pressure in both spaces is detected by the differential pressure gauge 20, and the differential pressure detection signal is taken into the volume measurement sensor 21,
The volume V of the head chamber 82 is calculated based on the differential pressure detection signal, and the calculated volume V is taken into the data processing device 43 via the amplifier 41 and the A / D converter 42 as shown in FIG.

Then, the data processing device 43 compares the reference volume data A with the volume V and calculates a volume reduction amount ΔV corresponding to the difference,
The thickness (cutting amount) k of the lower surface portion 81 to be cut is calculated based on the volume reduction amount ΔV. In this embodiment, when the average cross-sectional area of the head chamber 82 is B, the cutter cutting amount k is obtained as k = ΔV / B, for example. The method of calculating the cutter depth k is not limited to the present embodiment.

Then, data indicating the cutter cutting amount k is transmitted to the program controller 45, and the milling unit driving means 47 and the cutter base driving means 48 are driven. And
As shown in FIG. 3a, first, the rod 72 is moved downward by the milling unit driving means 47 and the positioning table 73 is moved.
Is set near the position lower than the reference position by the length k.
Next, the cutter base 60 is driven by the cutter base driving means 48.
Is moved upward, and the movement is stopped when the cutter 62 contacts the positioning table 73. Then, the position of the tip 61 of the cutter 62 is set by the MT pulser 74, and at that stage, the position is corrected by the length k from the reference position, and as shown in FIG. 3b, a position higher by the dimension k than the lower surface portion 81 of the head cylinder 80. The position of the cutter 62 is set.

Subsequently, the cutter 62 is driven to rotate, and the cutter device driving means 46 is operated by the programmable controller 45, whereby the cutter 62 is moved together with the milling unit 70 and the like with respect to the head cylinder 80 as shown in FIG. proceed. As the cutter 62 rotates, the lower surface 81 of the head cylinder 80 is cut by the thickness k. As a result, as shown by a dashed line in FIG. 4, the lower surface 81 is cut by the thickness k, and the head cylinder 80 in which the volume of the head chamber 82 becomes equal to the reference volume data A is obtained.
Is obtained. Since the head cylinder 80 thus obtained has a constant head chamber volume, the engine performance does not decrease. Further, according to this method, it is possible to always obtain a head cylinder having a constant head chamber volume irrespective of the aging of the mold or the variation of the valve seat.

In the present embodiment, as the cutting means, an example in which a plurality of chips 61 are provided on the upper surface of the cutter 62 as shown in FIG. 3a is described, but the cutting means is not limited thereto. As shown in FIG. 5, a ball end mill 100 may be used.

(Effect of the Invention) As described above, the present invention measures the chamber volume of the head cylinder, compares the measured value with a reference value, and cuts the lower surface of the head cylinder based on the comparison result.
Since the chamber volume can be set to a constant value, a head cylinder with an appropriate chamber volume can be obtained continuously,
As a result, there is an effect that the engine performance is not reduced.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing a chamber volume measuring apparatus to which an embodiment of the present invention is applied, FIG. 2 is a block diagram showing a chamber volume correcting system to which the embodiment is applied, and FIG.
3a to 3c are schematic views showing an operation procedure in the embodiment, FIG. 4 is a sectional view showing an example of a head cylinder applied to the embodiment, and FIG. 5 is a chamber volume correcting system shown in FIG. FIG. 6 is a schematic view showing a ball end mill as another example of the cutting means in FIG. 11,12 …… Tank, 13,14 …… Valve, 15,17 …… Three-way valve, 16
…… Master tank, 18… Masking jig, 20 …… Differential pressure gauge, 21 …… Volume measuring sensor, 43 …… Data processing device, 44
…… Memory, 46 …… Cutter device driving means, 47 …… Milling unit driving means, 48 …… Cutter pedestal driving means, 60 …… Cutter pedestal, 61 …… Chip, 62 …… Cutter, 70 …… Milling unit, 71: End face measuring head, 72: Rod, 73: Positioning table, 80: Head cylinder, 81: Lower surface, 82: Head chamber.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Teruyuki Ito 1-1-1, Asahi-cho, Kariya-shi, Aichi Prefecture Inside Toyota Koki Co., Ltd. (72) Inventor Yasuhiro Okada 1-1-1, Asahi-cho, Kariya-shi, Aichi Prefecture Toyota Takumi Inside Kikai Co., Ltd. (72) Inventor Kiyotaka Kinoshita 1-1, Asahi-cho, Kariya City, Aichi Prefecture Toyota Koki Co., Ltd. JP, B2)

Claims (1)

(57) [Claims] 1. A head cylinder processing method comprising: measuring a chamber volume of a head cylinder; comparing the measured amount with a predetermined reference value; and cutting the lower surface of the head cylinder based on the comparison result. Method.