Detachable aligning pin for die assembly

• US 4,199,313 A
• Filed: 06/02/1978
• Issued: 04/22/1980
• Est. Priority Date: 06/02/1978
• Status: Expired due to Term

• Current Assignee: Ottmar G. Bohnenberger
• Original Assignee: Ottmar G. Bohnenberger
• Inventors: Bohnenberger, Ottmar G.
• Primary Examiner(s): Tillman, Murray
• Assistant Examiner(s): Koeckert, A. H.
• Application Number:
  US05/912,086
• Time in Patent Office: 690 Days
• Field of Search: 249/205, 249/160, 249/161, 249/162, 249/165, 249/166, 425/183, 425/186, 425/555, 425/408, 164/385, 164/386, 164/387, 164/388
• US Class Current: 425/408
• CPC Class Codes: B22C 21/10 Guiding equipment
• CPC Class Codes: B22D 17/22 Dies manufacture, see the appropriate class, e.g. B23P15/24; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies

Abstract

A die assembly includes relatively movable first and second dies, and a plurality of guide pin assemblies mounted on the first die and an equal plurality of aligning passageways formed in the second die for receiving the respective guide pin assemblies. Each of the guide pin assemblies includes a first section mounted within the first die, and a second aligning pin section connected to the first section. Each aligning pin section extends above the surface of the first die for entering one of the plurality of aligning passageways for aligning the first and second dies. Each aligning pin section is detachably connected to a first section and is detached after the first and second dies have been aligned and are ready to be used. In this manner, when the first and second dies are differentially heated during use, the problem of scoring or damaging the aligning pin sections is avoided. In an alternative embodiment, replacement aligning pin sections may be substituted for the original aligning pin sections, with the replacement aligning pin sections including through holes having a central longitudinal axis offset from the central longitudinal axis of the pin section to compensate for uneven expansion of the first and second dies.

Claims

1. In a die assembly, an improved aligning pin arrangement, comprising:

relatively movable first and second dies,

a plurality of guide pin assemblies on said first die and an equal plurality of aligning passageways formed on said second die for receiving respective ones of said guide pin assemblies,

each of said guide pin assemblies including a first section mounted within said first die and a second aligning pin section connected to said first section, said second aligning pin sections extending above the surface of said first die and having an outer configuration substantially equal to the inner configuration of said aligning passageways for entering an associated one of said plurality of aligning passageways for aligning said first and second dies, and

each of said second aligning pin sections being detachably connected to a respective first section and including a through hole and means extending therethrough for engaging said respective first sections and securing said respective second aligning pin sections thereto, so that each of said second aligning pin sections may be detached from its respective first section after said first and second dies have been aligned and are ready to be used.

2. A die assembly in accordance with claim 1, wherein each of said first sections and second aligning pin sections are detachably connected by bolt means extending through said through hole.

3. A die assembly in accordance with claim 1, wherein each of said first sections includes a tapered head extending above the surface of said first die, and wherein each of said second aligning pin sections includes a tapered recess formed in the bottom thereof for matingly receiving said tapered head.

4. In a die assembly, an improved aligning pin arrangement, comprising:

relatively movable first and second dies,

a plurality of guide pin assemblies mounted on said first die and an equal plurality of aligning passageways formed in said second die for receiving associated ones of said guide pin assemblies to align said first and second dies,

each of said guide pin assemblies including a first section mounted within said first die and a second aligning pin section connected to said first section, said second aligning pin sections extending above the surface of said first die for entering an associated one of said plurality of aligning passageways in said second die for aligning said first and second dies,

each of said second aligning sections being detachably connected to a respective first section so that each of said second aligning pin sections may be detached from its respective first section after said first and second dies have been aligned, and

a plurality of replacement second sections for replacing said detached aligning pin sections, each of said replacement sections having an outer annular wall including oppositely disposed first and second circumferential portions, said first circumferential portion of the outer wall of each of said replacement second sections having a larger radial dimension than the radial dimension of said second circumferential portion of said outer wall to compensate for uneven expansion of said first and second dies.

5. A die assembly in accordance with claim 4, wherein said respective first and second sections are detachably connected by bolt means and wherein said respective first sections and replacement sections are detachably connected by said bolt means.

6. A die assembly in accordance with claim 5, wherein each of said second aligning pin sections and each of said replacement sections includes a through hole through which said bolt means extends for engaging said respective first sections.

7. A die assembly in accordance with claim 4, wherein each of said first sections includes a tapered head extending above the surface of said first die and wherein each of said second sections and each of said replacement sections includes a tapered recess formed at the bottom thereof for matingly receiving said tapered head of an associated first section.

8. A die assembly in accordance with claim 6, wherein the through holes of each of said replacement sections includes a central longitudinal axis offset from the central longitudinal axis of said replacement sections.