JP3448690B2 - Press machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine for drawing and ironing metal drawn products such as metal containers for food and soft drinks. [0002] As is well known, metal cans as metal containers for food and soft drinks are manufactured by drawing and ironing using a press machine. As shown in FIG. 7, in the conventional press machine, the center of the punch 100 and the center of the die 101 are set and held and fixed concentrically in order to equalize the thickness of the work (workpiece) W. is there. Die 10
The portion D of the processing hole 101a formed in the center of
It is the ironing part. Work W using this press machine
8 (A) to 8 (C) show steps of simultaneously drawing and ironing. [0003] However, in the conventional press described above, the center of the punch 100 is set and held so as to be concentric with the center of the die 101. When the center of the die 100 is shifted from the center of the die 101, a phenomenon occurs in which the thickness of the work W becomes uneven. The operation of aligning the center of the punch 100 with the center of the die 101 requires skill. For example, in the case of performing continuous drawing in multiple stages, the center of the punch 100 is set to the center of the die 101 for each process. Since it has to be set on the upper side, much time and labor is required, and the operation is complicated. [0005] The present invention has been made in view of such problems of the prior art, and even if the center of the punch is not held on the center of the die, the center of the punch is aligned with the center of the die during processing. It is an object of the present invention to provide a press machine which automatically moves to make the thickness of a work after processing always uniform. The present invention has the following features to attain the object mentioned above. That is, in a press machine for drawing and ironing a work with a die and a punch inserted and held in a mounting hole of the punch holder, the punch was held with a predetermined clearance in the punch holder. Further, a drawing portion for drawing the work and a drawing portion for drawing the work are formed on the die, and the drawing portion of the die is used as a guide for the work, and the punch is coaxial with the die. It was a guide to move. The optimum clearance between the punch holder and the punch is, for example, about 0.05 mm in the radial direction. Further, the punch may be formed integrally, but may be formed of a plurality of members. The metal drawn product manufactured by the press machine is not limited to a metal can for food, a soft drink or the like, but may be a metal container or a product other than a can. [0010] Even if the center of the punch is not held on the center of the die, the punch holder has a predetermined clearance and has a predetermined clearance.
Hold the punch and align the squeezed part of the die with the punch.
Due to the configuration as a guide to be moved on the core, the center of the punch automatically moves to the center of the die during processing. As a result, the thickness of the work is always uniform, and a good pressed product is obtained. An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall side view of a press machine in a first embodiment. This press machine 1 produces a metal can as a container for food and soft drinks by squeezing and ironing a work W. It is used for As shown in FIG. 1, a press 1 has a die 2 held by a die holder 3 and a die set 5 which moves up and down on a base 2. A punch holder 6 is attached to the lower surface of the die set 5 at a position facing the die 4 via a fastening bolt 7. As shown in FIG. 2, the punch holder 6 has two blocks fastened and fixed by a pair of tightening bolts 8, 8, so that a large-diameter mounting hole 6a and a small-diameter mounting hole 6b are continuously formed at the center thereof. ing. These mounting holes 6a, 6b
Next, as shown in FIG. 3, the punch 9 is held with a predetermined clearance. As shown in FIG. 4, a processing hole 4a is formed in the center of the die 4. The upper side of the processing hole 4a is formed in an inverted conical surface shape, and a drawing portion A for drawing the work W and a pressing portion B for pressing the work W are continuously formed below the processing hole 4a. The squeezed portion A of the processing hole 4a of the die 4 has a function of guiding the work W, and the center of the punch 9 and the center of the die 4 are automatically set concentrically and set so as to fit therein during processing. Has the function of guiding the user. As shown in FIG. 3, the punch 9 comprises a large-diameter head 9a and a machined portion 9c of the body 9b, and a clearance t1 is provided between the large-diameter head 9a and the large-diameter mounting hole 6a. (For example, 0.05 mm) has a clear run t2 (for example, 0.025 mm on one side) between the trunk portion 9b and the small-diameter mounting hole 6b. In addition, as shown in FIG.
T is the thickness of the work W after drawing in
Assuming that the thickness of the work W after ironing in
t. Next, with reference to FIGS. 5A to 5C, the steps of drawing and ironing the work W by the press machine 1 will be described. As shown by reference numeral H in FIG. 5A, even if the center of the processing hole 4a of the die 4 of the press machine 1 and the center of the punch 9 are displaced, the workpiece W shown in FIG. In the step of drawing at the drawing portion A of the processing hole 4a, the center of the processing hole 4a of the die 4 and the center of the punch 9 are automatically adjusted to the concentric position. After the drawing process in which the center of the punch 9 is automatically set on the center of the processing hole 4a of the die 4, as shown in FIG. By descending to B, the work W is ironed. As described above, even if the center of the punch 9 is not held on the center of the die 4, the center of the punch 9 is automatically set on the center of the die 4 during drawing. As a result, the thickness of the work W is always made uniform, and a good pressed product having a high yield can be obtained. Further, since it is not necessary for the operator to perform a skillful operation of aligning the center of the punch 9 with the center of the die 4 as in the related art, even in the case where the drawing operation is continuously performed in multiple stages, a simple operation requires a short time. Is subjected to predetermined processing. Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment differs from the first embodiment only in the configuration of the punch. Therefore, the punch will be described. The punch 10 used in the second embodiment
As shown in FIG. 6, the first member 11 includes a large-diameter head 11a and a body 11b, and a second member 13 fixed to the first member 11 via a fastening bolt 12. Have been. Large diameter head 11 of first member 11 of punch 10
a between the body 11b of the first member 11 and the body 13a of the second member 13 of the punch 10 and the small-diameter mounting hole 6b of the punch holder 6. Since each has a clearance t2, the same operation and effect as those of the first embodiment can be obtained. As described above, according to the present invention,
In a press machine for drawing a work with a die and a punch held by a punch holder, etc., by holding the punch with a predetermined clearance in the punch holder, even if the center of the punch is not held on the center of the die. During processing, the center of the punch is automatically set on the center of the die. As a result, an excellent effect is achieved in that the thickness of the work is always uniformly processed, and a good pressed product having a high yield can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side view of a first embodiment of a press according to the present invention. FIG. 2 is an explanatory view of a punch holder of the press according to the first embodiment. FIG. 3 is a sectional view showing a holding state of a punch of the press machine of the first embodiment. FIG. 4 is an explanatory view of a die of the press machine of the first embodiment. FIGS. 5A to 5C are cross-sectional views for sequentially explaining the processing state by the press machine of the first embodiment. FIG. 6 is a cross-sectional view showing a holding state of a punch of a press according to a second embodiment. FIG. 7 is an explanatory diagram of a die and a punch in a conventional press machine. 8 (A) to 8 (C) are cross-sectional views for sequentially explaining a processing state by a conventional press machine. [Description of Signs] 1 Press machine 4 Die 6 Punch holder 6a, 6b Mounting holes 9, 10 Punch W Work

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-303634 (JP, A) JP-A-3-275228 (JP, A) Fully open 58-66036 (JP, U) Really open 9722 (JP, U) Japanese Utility Model Hei 6-77918 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21D 51/26 B21D 22/28 B21D 37/14 B21D 51/18 B21D 24/00

Claims (1)

(57) [Claim 1] In a press machine for drawing a work with a die and a punch inserted and held in a mounting hole of a punch holder, the punch holder has a predetermined radial clearance. Holding the punch, forming, on the die, a drawing portion for drawing the work and a drawing portion for pressing the work, and using the drawing portion of the die as a guide for the work, and consolidating the punch with the die. A press machine characterized by a guide that can be moved upward.