U.S. patent application number 10/934407 was filed with the patent office on 2006-03-09 for method for making punch head of paper punch.
Invention is credited to Chien-Chuan Huang.
Application Number | 20060048559 10/934407 |
Document ID | / |
Family ID | 35994864 |
Filed Date | 2006-03-09 |
United States Patent
Application |
20060048559 |
Kind Code |
A1 |
Huang; Chien-Chuan |
March 9, 2006 |
Method for making punch head of paper punch
Abstract
A method for making punch heads includes a step of pulling a
cylindrical metal material wrapped around a mandrel; a step of
cutting the cylindrical metal material into sections; a step of
inserting the sections into concavity of a mold set and punching a
recess in a first end of each section by a first tool; a step of
punching the recess into V-shaped recess and including a punching
edge by a second tool; a step of pushing the sections out from the
mold set by a pushing rod; and a step of obtaining a punch
head.
Inventors: |
Huang; Chien-Chuan; (Yuan
Lin Town, TW) |
Correspondence
Address: |
BACON & THOMAS, PLLC
625 SLATERS LANE
FOURTH FLOOR
ALEXANDRIA
VA
22314
US
|
Family ID: |
35994864 |
Appl. No.: |
10/934407 |
Filed: |
September 7, 2004 |
Current U.S.
Class: |
72/371 |
Current CPC
Class: |
B21K 5/12 20130101; B21K
5/20 20130101 |
Class at
Publication: |
072/371 |
International
Class: |
B21K 5/02 20060101
B21K005/02 |
Claims
1. A method for making punch heads, comprising: step 1: pulling
cylindrical metal material wrapped around a mandrel; step 2:
cutting the cylindrical metal material into sections; step 3:
inserting the sections into concavity of a mold set and punching a
recess in a first end of each section by a first tool; step 4:
punching the recess into a V-shaped recess and including a punching
edge by a second tool; step 5: pushing the sections out from the
mold set by a pushing rod; step 6: obtaining a punch head.
2. The method as claimed in claim 1 further comprising two guide
wheels and the cylindrical metal material being transported by
rotation of the two guide wheels.
3. The method as claimed in claim 1, wherein a second end of each
section is pressed to form a rounded edge in step 3.
4. The method as claimed in claim 1, wherein the cylindrical metal
material is a solid cylindrical strip.
5. The method as claimed in claim 1, wherein the concavity includes
a narrow section which forms an inclined shoulder and the second
end of each section is pressed onto the inclined shoulder to form
the rounded edge.
6. The method as claimed in claim 1 further comprising a step of
making a groove or a hole in the section between steps 5 and 6.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a method for making punch
heads by an efficient way.
BACKGROUND OF THE INVENTION
[0002] A conventional method for making punch heads is disclosed in
FIGS. 1 and 2, and generally includes the following steps:
[0003] Step 1: preparing a long tube 11;
[0004] Step 2: cutting the long tube 11 in sections at desired
length;
[0005] Step 3: making a groove 14 or a hole 15 in each section and
a rounded edge 13 defined in a first end 12 of each section;
[0006] Step 4: making a punching edge 16 in a second of each
section by a tool 20;
[0007] Step 5: proceeding a heat treatment to each section;
[0008] Step 6: surface grinding for each section;
[0009] Step 7: anti-rust treatment; and
[0010] Step 8: obtaining a final punch head 10.
[0011] It is noted that the manufacturers have to install the long
tube 11 frequently and each long tube 11 can only be made into
limited number of sections. The sections are made to have the
punching edge 16 one by one and this is a time-consuming job.
Besides, the tools 20 are worn out quickly and the debris of the
long tubes and sections is harmful to the manufacturers.
[0012] The present invention intends to provide an easy and
efficient way to make the punch heads which can be made within a
short period of time.
SUMMARY OF THE INVENTION
[0013] The present invention relates to a method for making punch
heads and the method comprises:
[0014] step 1: pulling cylindrical metal material wrapped around a
mandrel;
[0015] step 2: cutting the cylindrical metal material into
sections;
[0016] step 3: inserting the sections into concavity of a mold set
and punching a recess in a first end of each section by a first
tool;
[0017] step 4: punching the recess into V-shaped recess and
including a punching edge by a second tool; and
[0018] step 5: pushing the sections out from the mold set by a
pushing rod.
[0019] The present invention will become more obvious from the
following description when taken in connection with the
accompanying drawings which show, for purposes of illustration
only, a preferred embodiment in accordance with the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 shows the steps of a conventional method for making a
punch head;
[0021] FIG. 2 shows the diagrams of the results of the steps in
FIG. 1;
[0022] FIG. 3 shows the steps of the method of the present
invention for making a punch head;
[0023] FIG. 4 shows the diagrams of the results of the steps in
FIG. 3;
[0024] FIG. 5 is a perspective view to show a first type of the
punch head made by the method of the present invention, and
[0025] FIG. 6 is a perspective view to show a second type of the
punch head made by the method of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0026] Referring to FIGS. 3 to 4, the method of the present
invention for making punch heads comprises the following steps:
[0027] step 1: pulling an end of a roll of solid strip of
cylindrical metal material 30 wrapped around a mandrel 300 and two
guide wheels 40 clamping forward the end of the cylindrical metal
material 30;
[0028] step 2: cutting the cylindrical metal material 30 into
sections 31;
[0029] step 3: inserting the sections 31 into concavity 51 of a
mold set 50 and punching a recess 311 in a first end of each
section 31 by a first tool 52, a second end of each section 31
being pressed to form a rounded edge 312;
[0030] step 4: punching the recess 311 into a sharp V-shaped recess
313 and including a punching edge by a second tool 53;
[0031] step 5: pushing the sections 31 out from the mold set 50 by
a pushing rod 54;
[0032] step 6: making a groove 314 or a hole 315 in the section 31
according to practical needs as shown in FIGS. 5 and 6;
[0033] step 7: proceeding a heat treatment to each section 31;
[0034] step 8: surface grinding for each section 31;
[0035] step 9: applying anti-rust treatment to each section 31;
and
[0036] step 10: obtaining a final punch head 60.
[0037] In step 3, the concavity 51 includes a narrow section which
forms an inclined shoulder 511 such that when the first end of each
section 31 is punched into a recess 311, the second end of each
section 31 is pressed onto the inclined shoulder 511 to form the
rounded edge 312. It is noted that the cylindrical metal material
30 occupies less space than the long tube in the conventional
method so that more sections 31 can be made continuously within a
short period of time. The mold set 50 can be rotated to be treated
by different stations where different tools 52, 53 are located, by
this way, the manufacturing time can be saved. The solid punch head
60 has better structural strength and the V-shaped punching edge
efficiently penetrates document.
[0038] While we have shown and described the embodiment in
accordance with the present invention, it should be clear to those
skilled in the art that further embodiments may be made without
departing from the scope of the present invention.
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