JPH0628804B2 - Product length detector for automatic lathe - Google Patents

Description

Description: [Object of the Invention] (Field of Industrial Application) The present invention relates to a product length detection device in an automatic lathe, and more specifically, a length of one axis of a multi-axis attachment device in an automatic lathe. The present invention relates to a product length detection device in an automatic lathe, which is equipped with a product length detection device equipped with a measuring instrument to detect the length of each product.

(Prior Art) Conventionally, when continuously producing products from a bar material by an automatic lathe, a material feeding device is interlocked with a chuck for grasping a material, and a material set to a predetermined length is post-processed after processing. Product was mass-produced by repeating the operation of cutting with a cutting tool or the like.

(Problems to be Solved by the Invention) In the conventional technique as described above, when the chucking force of the chuck for gripping the material is changed, or when the feeding device such as the cam causes a manufacturing error or backlash due to wear, the feeding is performed. There was a problem that a large amount of defective products were produced because the automatic lathe was operated continuously because the product of the set length could not be obtained due to incorrect precision. In addition, there is a problem that good products and defective products are mixed as products, which hinders the production plan.

The present invention has been made in view of the conventional problems as described above, and measures the total length of each product, judges whether the product is good or bad, and mixes defective products, prevents mass production of defective products, and performs quality control. The present invention provides an improved product length detecting device for a new automatic lathe.

[Structure of Invention]

(Means for Solving the Problem) In order to solve the above-mentioned conventional problems, in the present invention, the automatic spindle is mounted on a tool spindle of a multi-axis attachment device arranged at a position facing the main spindle. In the product length detection device described above, upper and lower detection rods provided in the intersecting direction are connected to each other through a plurality of slidable spheres in arc-shaped holes formed in the detection rod support cylinder, and contact the upper detection rod. The length measuring device is locked to the detection rod supporting cylinder.

(Operation) As is apparent from the above configuration, the product length detection device is mounted on the tool spindle of the multi-axis attachment device, and the product length detection device includes upper and lower detection rods provided in the detection rod support cylinder in the intersecting direction. , Are connected via a plurality of spheres slidably accommodated in an arc shape provided in the detection rod support cylinder. Therefore, when the lower detection rod comes into contact with the material and the product length is measured, the movement amount moves the upper detection rod through the sphere,
Activate the length measuring device that is in contact with the upper detection rod.

If the detected value of the length measuring device is within the set predetermined range, the machine is continuously operated to mass-produce the product. When it is out of the specified range, it is judged as a defective product and the machine is stopped before the material is cut off.

As mentioned above, even if the product length error occurs for some reason, the machine can be immediately stopped, and a large number of defective products can be produced without noticing defective products into non-defective products. Therefore, mass production and quality control can be improved.

(Example) In order to facilitate understanding, first, the overall configuration of the automatic lathe will be schematically described.

Referring to FIG. 5, the automatic disc 1 for controlling the cam feed cam is as follows.
A headstock 5 is provided on the base 3, and a chuck 9 for gripping a material W automatically fed by a bar feeder (not shown) is provided at the tip of a spindle 7 mounted on the headstock 5. ing. The tool W holds the material W gripped by the chuck 9
Processing is performed with the blade 13 provided in 1.

A multi-axis attachment device 15 is provided on the base 3 so as to face the spindle 7 provided on the headstock 5, and the tool spindle 1 provided on the multi-axis attachment device 15 is provided.
A product length detection device 19 is supported on the chuck 7 of FIG.

The product length detecting device 19 according to the embodiment of the present invention is
It is constructed as shown in FIGS. That is, for example, a tool chuck 17 of a multi-axis attachment device 15 provided on the base 3 holds a shaft 27 projecting from a block 25 constituting a detection rod support cylinder 23 of a product length detection device 19 in a drill chuck 21, for example. . Detection rod support cylinder 23
Has an L shape, a lower detection rod support cylinder 29 is horizontally provided from the block 25, and a lower detection rod 31 is provided inside thereof so as to be movable forward and backward (left and right in FIG. 1). In addition, the upper detection rod 35 also moves up and down inside the upper detection rod support cylinder 33 extending upward from the block 25 (first
(Upward and downward in the figure).

A bracket 37 is provided near the upper portion of the upper detection rod support cylinder 33.
Is fixed to the other end of the connecting shaft 39 fixed to the bracket 37, and a contact length measuring device 41 (for example, a dial indicator or a measuring center) provided on the same line as the center of the upper detection rod 35 is attached. A bracket 43 for supporting is provided. Then, the detection rod 4 of the length measuring instrument 41 with contacts
5 is in contact with the upper detection rod 35.

Furthermore, regarding the internal structure of the detection rod support cylinder 23,
A detailed description will be given with reference to the drawings.

The block 25 provided with the shaft 27 is provided with a screw shaft 49 provided with a hole 47 formed in a horizontal direction so as to project, and the screw shaft 53 provided with a hole 51 is provided in an upward direction so as to have an L shape. Is made. The lower detection rod 31 and the upper detection rod 35 are movably fitted in the holes 47 and 51 provided in the screw shafts 49 and 53, respectively.

The lower detection rod support cylinder 29 is screwed into the threaded portion 55A of the screw shaft 49 protruding in the horizontal direction, and the step plate 57 provided at the tip of the lower detection rod support cylinder 29 is provided with the stop plate provided on the lower detection rod 31. 59 is abutted, and a spring 61 is incorporated between the stop plate 59 and the tip of the screw shaft 49, and the lower detection rod 3
1 is biased in the protruding direction.

On the other hand, the upper detection rod support cylinder 33 is integrally configured by combining a lower cylinder 33A, a connecting cylinder 33B, an intermediate cylinder 33C and an upper cylinder 33D. The lower cylinder 33A is the block 25
Screwed to the screw portion 55B of the screw shaft 53 protrudingly provided in the connection pipe 33B, the connecting pipe 33B integrally connects the lower pipe 33A and the intermediate pipe 33C, and the intermediate pipe 33C is provided with the screw portion 63 at its tip. An upper cylinder 33D is screwed onto 63.

A hole 65 is formed inside the lower cylinder 33A and the intermediate cylinder 33C described above.
Is provided, and the upper detection rod 35 is vertically movably inserted into the hole 65. A step portion 67 is provided on the upper portion of the upper cylinder 33D, and a spring 71 is incorporated between the step portion 67 and the step portion 69 provided on the upper detection rod 35 so that the upper detection rod 35 is constantly moved downward. I am urged. The upper detection rod 35 and the lower detection rod 31 are made of, for example, a super hard metal to prevent wear.

Inside the block 25 supporting the upper detection rod support cylinder 33 and the lower detection rod support cylinder 29, the upper detection rod 35 and the lower detection rod 31 are inserted, and a hole 47 is formed so as to be freely movable.
An arcuate hole 73 communicating with the holes 51 and 51 is provided.
A plurality of steel balls 75 are housed in the hole 73. Reference numeral 77 is a bolt hole for tightening a divided cover member (not shown) for processing the arc-shaped hole 73.

In the above configuration, the spindle 17 is moved to the material W side, and the lower detection rod 31 of the detection rod supporting cylinder 23 is attached to the end surface of the material W.
When the tip of the spring contacts the lower detection rod 31,
Is compressed, and the upper detection rod 35 is projected through the sphere 75 against the elastic force of the spring 71. The sphere 75 is made of steel having high hardness, and the amount of movement of the lower detection rod 31 can be accurately transmitted to the upper detection rod 35.

As described above, when the tip of the lower detection rod 31 presses the end surface of the material W being processed, the upper detection rod 35 rises, and the measurement is performed by pushing the detection rod 45 of the contact length measuring device 41. If the amount is within the set range, the product is within the predetermined correct length range, and if it is out of the set range, it is judged as a failure.

As described above, the spindle 7 of the spindle stock 5 is provided at a position facing the multi-axis attachment device 15, and the chuck 7 for holding the material W is provided on the spindle 7. A plurality of tool rests 11 are provided radially with respect to the material W held by the chuck 9, and the tool rests 11 are set on the tool rest 11 to perform working.

As shown in FIG. 4, the contact range of the contact-equipped length measuring instrument 41 is such that a permissible error L2 is provided before and after a predetermined length L1 of the material W set by the feeding device, and measurement is performed within that range. If there is a value, it is judged as a good product, and if it is out of the range, it is judged as a defective product and a signal is issued to stop the machine.

That is, when a dial indicator with an electric contact is adopted as the contact length measuring device 41, the electric contact is closed or opened depending on the length of the product to be measured,
It is a type that outputs a signal to the outside, and the measurement result is controlled in three stages (-NG, OK, + NG) by this signal. -N
In the case of G, the automatic lathe is stopped, in the case of + NG, the breakage of the cutting tool is detected and the automatic lathe is stopped, and in the case of OK, the continuous operation is performed.

Using the contact length measuring device 41 described above, the product is measured before being cut off, and for example, the range required for the cut-off of the cam plate for operating the cut-off bite is detected by the limit switch, and the detection signal and the contact The length measuring device 41 also detects the error detection signal and controls the operation and stop of the automatic lathe 1.
When length measurement is not required, for example, when cutting the tip, the detection rod support cylinder 23 is positioned at the standby position shown in FIG.

As described above, the tool spindle 17 is associated with the operation of the parting tool by the rotation of the cam shaft in the automatic lathe.
Is moved, and the total length of each product is measured with the contact length measuring device 41 before the product is cut off. When the measurement result is within the allowable range L2, continuous operation is performed, and when the measured result is outside the allowable range L2, the machine is stopped. Therefore, defective products do not mix into good products and mass production and quality You can measure the improvement of management.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

〔The invention's effect〕

As can be understood from the above description of the embodiment, according to the present invention, the lower detection rod of the product length detection device mounted on the chuck of the tool spindle of the multi-axis attachment device,
It is connected to the upper detection rod via a sphere, and the upper detection rod is in contact with the length measuring instrument with contacts, which is locked to the upper detection rod support cylinder.

Then, the tool spindle is moved over the entire length of each product, the lower detection rod of the product length detection device is moved forward and backward, and the length measuring device with contacts is used to measure and detect whether the product has passed or failed. When it is within the setting range, the pass signal is issued and the automatic lathe is continuously operated. When it is out of the setting range, the fail signal is issued and the automatic lathe is stopped.

As a result, mass production and improvement of quality control can be achieved without mixing defective products into non-defective products.

[Brief description of drawings]

The drawings show an embodiment of the present invention and are shown in FIGS.
FIG. 1 shows a product length detecting device, FIG. 1 is a side view, FIG. 2 is a front view of FIG. 1, and FIG. 3 is III-I of FIG.
It is an expanded sectional view which followed the II line. FIG. 4 is an operation explanatory view. FIG. 5 is a schematic explanatory view showing the overall structure of the automatic lathe. 1 …… Automatic lathe 7 …… Spindle 15 …… Multi-axis attachment device 17 …… Tool spindle 19 …… Product length detector 23 …… Detection rod support tube 31 …… Lower detection rod 35 …… Upper detection rod 41 …… Length measuring instrument with contacts 75 ... Sphere

Claims (1)

[Claims] 1. A product length detecting device mounted on a tool spindle of a multi-axis attachment device arranged at a position facing the main spindle of an automatic lathe, and upper and lower detection rods provided in the intersecting direction are supported by the detection rod. It is characterized in that the inside of the arc-shaped hole formed in the cylinder is connected through a plurality of slidable spheres, and a length measuring device that abuts against the upper detection rod is locked to the detection rod support cylinder. Product length detector for automatic lathe.