JPS62236652A - Nc broaching machine - Google Patents

Abstract

PURPOSE:To obtain precise grinding, even if pitch of a cutting edge is gradually varied, by providing a device for storing a plurality of broach data or the like and a conversion processor for rewriting data to a value required for regrinding. CONSTITUTION:When a broach is to be reground, data of the broach to be reground is derived from a first memory 33 by a key such as of the predetermined broach number, and the data and set condition data from a second memory 34 are inputted into a processor 36. This calculates desired number of rotation of a grindstone, set angle and others. Data required for grinding of the broach, such as grinding feed rate, is derived from a third memory 35, and it is stored along with the broach data from the first memory 33 through a conversion processor 37 in a temporary memory 38. A control 39 sends commands to a table driving servomotor 4, ram cross feed servomotor 17 and a grindstone head vertical feed motor 9 to control the machine.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a broach grinding machine that fully automatically grinds the rake face of a broach groove.

(Prior Art) In recent years, the rake face of the blade groove of a broach has been ground using an automatic broach grinder using an NC device. In this case, data such as the height difference between the cutting edges of the broach, the pitch of the cutting edges, and the grinding allowance are input to the NC device, and the servo motor is activated by the pulse signal from the NC device. When the attached table and whetstone are installed, a predetermined movement is applied to the whetstone shaft head, etc., and the rake face of the broach's blade groove is fully automatically ground.

(Problem to be solved by the invention) However, the broach before grinding is subject to manufacturing errors in turning and milling before quenching, and elongation and bending of the material during heat treatment.
Errors usually occur in the pitch of the blade grooves. These errors are difficult to eliminate during manufacturing. Therefore, if the nominal dimension data described in the drawing of the broach is inputted into the NC device and the broach is ground based on the data, the above-mentioned pitch error will cause an excess or deficiency in the amount of grinding each month. In other words, some blades are ground more than necessary and others are not ground enough. This significantly shortens the life of the broach and increases costs. Furthermore, a broach is a cutting tool with a complex shape and a large number of teeth, and there is often a difference in the amount of wear between the rough cutting edge and the finishing cutting edge. Therefore, the amount of grinding when re-grinding can be set separately depending on the amount of wear on the rough edge and the finishing edge, but in that case, the cutting edge pitch after regrinding will be different from the cutting edge pitch before regrinding. differs only by adjusting the amount of grinding.

Additionally, the pitch of the broach gradually changes as the number of re-grinding increases. That is, when re-grinding is performed, if data of the nominal dimensions of the drawings as described above are input into the NC device and then ground is performed, there will be excess or deficiency in the amount of grinding each month. Some methods have been adopted to solve this problem, such as locating the entire position of the cutting edge each time it is re-grinded and then re-grinding using that position as a reference. However, the wasteful work of searching for the position each time is unavoidable. 〇 (Means for solving the problem) The NO broach grinding machine according to the present invention has a first storage device that stores a plurality of broach data, and the diameter, rotation speed, and inclination of the grindstone used for the broach. a second storage device that stores all data for determining machine setting conditions such as angle; a third storage device that stores all data of grinding conditions such as grinding allowance and feed speed; and the first and second storage devices. an arithmetic processing device that calculates data necessary for grinding a broach based on the data, a predetermined conversion processing device that inputs data from the first and third storage devices and the temporary storage device, and the conversion processing. It consists of a temporary storage device for storing the data of Fukuro & V- et al., and a control device that sends command signals to multiple servo motors based on the data in the temporary storage device. The data is rewritten into the necessary numerical values during grinding, transferred to the first storage device through the conversion processing device, and stored therein, corrected according to the wear amount of the six broach blades, and the data is rewritten each time the grinding is performed. This data is automatically rewritten and stored, and the next time when re-grinding is performed, the grinding allowance is set in advance based on this data and the grinding allowance is completely automatically ground.

(Function) When it becomes necessary to re-grind the broach, the broach data before grinding of each broach stored in the first storage device is called up, and the broach data is re-ground by a predetermined amount of grinding based on this i'Lfe standard. do. The data after re-grinding is calculated each time by the control device, stored in the storage device, and used as basic data for the next re-grinding.

Alternatively, if the pitch deviates significantly after re-grinding several times, re-measure the pitch, input the data into the storage device again, and perform re-grinding based on this data.

Friend, when first grinding the entire broach, the pitches of the cutting edges are not aligned due to machining errors before hardening and errors due to heat treatment distortion, so first use a detection device to detect the pitch and find its position. The amount of grinding for each month is determined based on the data stored in the storage device, and the grinding is performed automatically.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an example of an NO broach grinding machine according to the present invention, in which a table (3) is placed on an Afc slideway (2) formed on the top surface of a bed (II), and a servo motor ( The table (3) on the bed (1) can be moved in the horizontal direction via a nand (6) that is screwed into the feed screw (5) that is directly connected to the feed screw (5). A column (8) is attached to the sliding slideway (7).A servo motor (9) is attached to the column (8).
) is mounted on the tower and is directly connected to the motor shaft.
a meshes with the bevel gear (b) attached to the feed screw C1η, and as the bevel gear rotates, the column (8) moves up and down by the vertical feed screw αυ and nut (13), and the grindstone shaft head (described later) moves completely up and down. Column (8)
) A ram swivel stand σ4 is placed on the top surface of the ram swivel stand α4.
A ram (XQ is the first
It is mounted so as to be movable in the direction perpendicular to the plane of the drawing (left and right in FIG. 2). Further, the ram αQ is moved in the left-right direction in FIG. 2 through a nut 4 by the rotation of a feed screw directly connected to a servo motor α mounted at the rear end.

A work head 4 and a tail stock 4 are fixed to both ends of a horizontal table (3), and the main shaft □□□ of the work head 4 is rotated by a motor.

The broach (on the broach) is held by the center wire on the work head side and the center wire on the tailstock side, is given rotation by the rotating metal wire, and is attached to the tip of the whetstone spindle, and the whetstone is rotated with zero force as shown in Fig. 3 in detail. The rake face of the blade groove (
58) is ground. The positions of the broach (c) and the grindstone (31) are controlled by a control panel 64 shown below.

As shown in Figure 5, inside the control panel 0 mentioned above, there is a first storage device (to) that stores the specifications of the broaches, such as the pitch, number of teeth, outer diameter, rake angle, etc. of the cutting blades of multiple broaches, and a grindstone. A second storage device (b) that stores data that determines the setting conditions of the machine, such as the set angle of the rotation speed, and a third storage device 09 that stores data that determines the grinding conditions, such as the grinding allowance and feed rate. ing. When re-grinding the entire broach, the data of the broach that requires grinding is extracted from the first storage device 03 using a predetermined key such as A of the broach, and the data and the set condition data are retrieved from the second storage device (b). All information is input to the processing unit (to), and all calculations of the desired grindstone rotation speed, set angle, etc. are performed. In addition, data necessary for grinding such as the grinding feed rate regarding the broach is extracted from the third storage device (to) and stored in the temporary storage device (to) via the conversion processing device 0η along with the broach data in the first storage device 03. let The control device retrieves the data from the temporary storage device according to the program and sends commands to the table drive servo motor (48), the ram longitudinal drive servo motor αη, and the grinding wheel head vertical drive servo motor (9) to control the machine. is controlled.

According to Figure 6, the data that includes all the wear amounts of the rough and finishing blades is rewritten and stored for each re-grinding, and the machine is controlled based on this data and the grinding allowance is fully automatically set in advance for each time. We will explain the case of manual grinding.

(59) is a rough blade, and (60) (61X62X63) is a finishing blade.

The re-grinding of the broach starts from the finishing blade (63) at the rearmost end. The positioning of the grindstone 0υ and the broach is shown in Figure 1. By moving the stable (3), column (8), and ram α0 individually, the scooping surface (58) of the broach is adjusted as shown in Figures 3 and 4. Apply the whetstone 01) to the point, and use this point as a reference to retract the table (3), column (81 and ram αIE) to a preset position, start the machine as the origin of iNC, and the machine memorizes the point. The rake face of the broach is automatically ground according to a preset order based on the data.

As shown in Fig. 6 (a), first start with the rake face (58) of the finishing blade (63). Grinding is performed to a preset grinding amount (a). Next, move the table (3) to the value of the total broach pitch A and cut the rake face (58) of the finishing blade (62).
Set it to Friend Grinding It and grind it to the value of (a). Thereafter, the finishing blade (61 x 60 sides rake face) is similarly ground to the value of the grinding amount (a).

The rough blade (59) has a large amount of wear, and the finishing blade grinding amount (
(a) A larger value (b) k will be set and grinding will be performed.

As a result, if the total broach pitch before grinding is A, B, C, D as shown in Figure 4 (a), the proch pitch after re-grinding will be A, B, B, as shown in Figure 4 (b). ,C,,D,
At the end of this numerical total control device, the data is rewritten to the numerical values necessary for the next grinding, and is stored in the first storage device (to ) and use it as a reference for the next re-grinding. Thereafter, as shown in Figures (c) and 2), the broach pitch changes successively with each re-grinding, but the data is corrected and rewritten as described above each time the re-grinding is performed. Therefore, there will be no excess or deficiency in the amount of grinding for each round.

Next, all embodiments of a grinding machine using the detection device will be explained. The outline of the grinding machine is as shown in Figs. 7 and 8. Since the grinding is carried out in the same manner as in the above-mentioned embodiment, it will be omitted, but if there is a deviation in the pitch of the cutting edge of the broach during grinding and it is necessary to measure this, a detection device as described later may be used. Measured by The measured values are used as data for creating the entire re-grinding program and are sent to the control device OLl! as shown in Figure 9.
The data is stored in the first storage device (g) through the conversion processing device 6η.

An example of the detection device is shown in detail in FIGS. 1O and 11. As shown in FIGS. 7 and 8, the slider (/43) is attached to a guide surface of a detection device mount 3η provided on the front surface of the grinding wheel shaft head of the grinding machine.

The slider (G) is a screw that screws into the feed screw (G) that is directly connected to the knob.) Q*'? can be moved in a direction perpendicular to the axial direction of the grindstone shaft (1).

This slider (horizontal slider (
The guide plate (64) to which 65) is attached is not yet attached. The water slider (65) is directly connected to the feed screw 0 (to the knob).
! It can be moved in the horizontal direction along the V-groove of the guide metal (64) via a nut (7) that is screwed into the guide metal (64).

Base plate 4 on the front of the horizontal slider (65)
An elastic body (55) that holds a measuring device (52) having an electric signal output terminal with a mounting bracket (51) and a measuring head (54) equipped with a stylus (53) is fixed. . The measuring element (54) attached to one side of the elastic body (55) is pressed against the stopper (57) by a compression spring (56).

Similar to the embodiment shown in FIGS. 1 and 2, the table (3), column (8), and ram αf3 are individually moved to place the broach as shown in FIGS. 58), and using this point as a reference, set the table (3), column (8), and ram Get in advance, and retract to the next position. Fully adjust the position of the base plate @η until the broach (53) properly contacts the broach scooping surface (58).

The operating order of the U automatic measurement cycle is as follows. 2 by NC start button switch ○N on control panel CQ
The shaft servo motor (9) is driven and the column (8) begins to descend. At the same time, the X-axis servo motor (4) is driven and the table (3) starts moving to the left. The stylus (53) of the detection device
) enters the broach blade groove and stops both X-axes at the fixed position, then drives only the X-axis servo motor (4) to move the table (3) all the way to the right until it touches the broach rake face (58). needle(
53) hits and stops at the fixed position 0 This position is stored in the temporary storage device ■. Next, the X-axis servo motor (4) is fully driven, the table (3) is moved completely to the right, and the stylus (53) is slightly separated from the broach rake face (58) and stopped at a fixed position. Next, drive the 2-axis servo motor (9) to
) Raise the broach completely and stop at the position where the stylus (53) has completely come out of the broach blade groove. Next, to measure the entire second blade
The shaft servo motor (4) is driven to move the table (3) all the way to the right and stop it at a position where it has moved an amount equivalent to the broach pitch. The measurements of the second and subsequent blades are automatically performed in the same procedure as the measurement of the first blade described above, so that the actual measured values of each month of the broach can be stored in the storage device.

(Effect) The broach grinding machine according to the present invention (as described above) is equipped with a storage device that stores data such as the pitch of the cutting edge or rake face of each broach, so the amount of wear that occurs in each month of the broach is taken into consideration. Since the corrected data can be rewritten and memorized each time re-grinding is performed, the A7' (advantage of being able to grind automatically and in a short time with the grinding allowance) can be set in advance for each cutting edge of the broach based on this data. In addition, even if the pitch of the cutting edge gradually changes from the initial value with each re-grinding, the data is corrected and rewritten each time it is re-grinded, so there is no need to over- or under-grind. Accurate re-grinding is ensured without any problems.Therefore, this is possible even with uneven pitch broaches.It has many excellent benefits such as:

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an embodiment of the present invention, Fig. 2 is a partially cutaway side view of the same embodiment, Fig. 3 is an enlarged front view showing the relative position of the grindstone spindle and the broach, and Fig. 4 is the same. 5 is a block diagram, FIG. 6 is an explanatory diagram showing the state of broach grinding, FIG. 7 is a front view of main parts of another embodiment, and FIG. 8 is a side view.
The figure is a partially cutaway front view of the same embodiment, FIG. 9 is a block diagram of the same, FIG. 10 is a front view showing an example of a measuring device when the measuring device is used in the present invention, and FIG. A front view showing an example of a measuring device when the measuring device is used in the invention, the same figure (
b) is a sectional view taken along A-Am in the same figure ((), and Fig. 11 (
A) and (B) are side views showing the movement of the stylus. 32...Control panel 33...First storage device 34...Second storage device 35...Third storage device 36...Calculation Processing device 37...Conversion processing device 38...Temporary storage device 39...Control device agent Patent attorney Jun Kawauchi Nishi Paper 3 illustrations 4 Figure jZ Figure 5 17 Figure 18 Figure 9

Claims (2)

[Claims] (1) A first storage device (33) that stores a plurality of broach data, a second storage device (34) that stores data for determining machine setting conditions, and a third storage device that stores grinding condition data. a storage device (35), an arithmetic processing device (37) that calculates data necessary for grinding each broach based on the data in the first and second storage devices, and a conversion processing device for inputting data from a storage device into a temporary storage device; a temporary storage device for storing data from the conversion processing device; and a plurality of servo motors based on the data in the temporary storage device. It is characterized by a control device that sends a command signal, and further configured such that the control device rewrites the data into numerical values necessary for the next re-grinding, and transfers the data to the first storage device via the conversion processing device again and stores it. NC broach grinding machine. (2) The NC broach grinding machine according to claim 1, wherein the control device is connected to a detection device.