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to the reverse shape of the barrel including the rifling and if desired the chamber, so that no further work steps are required for cutting or pressing in the rifling). Then, the machine drives the barrel blank and mandrel into the machine, where the barrel passes through four hammers; one on each side. As the hammers strike the slowly rotating barrel, they impart about 140 tons of nominal forging force at a rate of about 1,000 strokes per minute, effectively squishing the barrel blank down onto the mandrel to bring the barrel blank to the intended length and shape and forming the rifling. The rifling can be absent, conventional or polygonal and the mandrel can also include a
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is formed at the exact same time as the metal is being forged, cold hammer forged barrels are typically known for retaining accuracy for a very long period of time. In fact, it was a process created specifically to extend the life of gun barrels by reducing the effects of wear. Cold-hammer forged machine gun barrels were
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The cold-hammer forging process starts with a (short) barrel blank that is already drilled out with a slightly oversized hole. A polished and hardened rifling mandrel rod is fitted to the hammer forging machine's driver, as is the barrel blank (the barrel blank surrounds the mandrel that corresponds
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reverse shape. The compression of the steel molecules created by this immense force also hardens the metal without the application of heat and thus avoids the brittleness that is associated with heating steel to its transformation temperature, hence the term "cold-hammer forging". Since the rifling
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BLM had a reported labor force of 3,809 in August 1944, comprising 1931 German men, 539 German women, 467 foreign women, 752 foreign men, and 120 war prisoners. The foreign workers were housed in onsite barracks. After the war, Berghaus was sought by the Allies for his participation in using forced
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rifles. The
Walther-designed Gewehr 41 was intended to replace the bolt-action Mauser to allow German infantrymen to offset the advantages of Red Army soldiers equipped with the semi-automatic Tokarev
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in less time than those produced with traditional methods as some processing steps that would otherwise be necessary, such as tempering or putting in the
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sniper scope. In 1944-45 it was 1 of 2 only manufacturers to make mounts for the ZF4 sniper scope. From 1936 to 1940, BLM supplied many parts for field
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conducted a bombing raid over Lübeck, heavily damaging the BLM factory and killing or wounding 58 of the facility's workers and air raid personnel.
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502:
Angriffsschlußbericht über den
Luftangriff auf Lübeck am 25.08.1944 ("Final battle report regarding the air attack over Lübeck on 25 August 1944")
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Angriffsschlußbericht über den
Luftangriff auf Lübeck am 25.08.1944 ("Final battle report regarding the air attack over Lübeck on 25 August 1944")
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rather than brand names. For the K98k rifles produced by BLM, they were designated with the German Army ordnance codes "S/237", "237" and "duv".
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147:(BLM) was a manufacturer of handguns, infantry rifles, ammunition up to 2 cm, flareguns and precision military equipment in
155:, Germany, was one of a number of metal-related businesses owned by Bernhard Berghaus, a German industrialist and member of the
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Albert F. Bender to Major S. Johnson, "Blocking of
Properties Belonging to Bernhard Berghaus", 3.5.1947
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Albert F. Bender to Major S. Johnson, "Blocking of
Properties Belonging to Bernhard Berghaus", 3.5.1947
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rifle. The Gewehr 41 design proved unsatisfactory in combat and was later replaced by the re-designed
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The plant, located on Curt-Helms-Str. (today: Glashüttenweg), sat along the eastern bank of the
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The development department of the Berlin-Lübecker
Maschinenfabrik developed a machine for the
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222:. BLM produced G41 rifles using the "DUV" code with "WaA214" inspection proofs.
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using the 'duv' identification code. On a small scale, the company made M1928
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general-purpose machine gun which very high 1,200 to 1,500 rounds-per-minute
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429:"Barrels and Bullets: Conventional Versus Polygonal Rifling - Human Events"
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party who played an important role in the rearmament of
Germany during the
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198:. As a means of hiding the identity of manufacturers, the German Army
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View on the site with ruins from the banks of the river Trave (2014)
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semi-automatic rifles using the ordnance codes "duv" and "qve".
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process addressed the need to (mass) produce more durable
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required manufacturers to mark their equipment with codes
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Combat
Chronology of the US Army Air Forces:August 1944
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In 1943, the plant began manufacturing semi-automatic
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490:Jack McKillop's Combat Chronology of World War II
348:imparted significant heat stress and wear during
186:From 1936 to 1942, the company manufactured the
194:. The K98k is a bolt-action rifle based on the
458:"How are Hammer Forged Barrels Made? And Why?"
360:On August 25, 1944, 81 B-24s of the American
8:
352:and thus warranted frequent barrel changes.
242:From 1941 to 1944, the company made all the
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190:, the standard service rifle of the German
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151:from 1936 to 1945. The company, based in
130:Invented the hammer forged barrel process
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340:during World War II for the air-cooled
316:A = land diameter, B = groove diameter
16:German firearm manufacturer, 1936–1945
7:
382:(in German) retrieved on 2013-02-04
14:
530:1945 disestablishments in Germany
520:Firearm manufacturers of Germany
504:(in German) retrieved 2013-02-04
406:(in German) retrieved 2013-02-04
178:, an island in the Trave River.
145:Berlin-Lübecker Maschinenfabrik
127:Footnotes / references
20:Berlin-Lübecker Maschinenfabrik
525:1936 establishments in Germany
1:
230:In 1944-45 the company made
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238:Scopes and Other Equipment
290:, can be dispensed with.
174:north of the old City of
167:labor in his facilities.
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262:bolt parts and barrels.
475:Radial Forging Machines
380:Abstract of the company
274:process. This combined
492:. Retrieved 2009-02-15
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313:Conventional rifling
113:, Firearm Components
272:cold-hammer forging
182:Karabiner 98k Rifle
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196:Mauser M 98 system
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324:Polygonal rifling
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121:Bernhard Berghaus
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435:. Archived from
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362:Eighth Air Force
346:cyclic fire rate
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226:Gewehr 43 Rifle
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206:Gewehr 41 Rifle
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439:on 2011-02-19
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188:Karabiner 98k
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462:gatdaily.com
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441:. Retrieved
437:the original
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359:
356:Bombing Raid
350:rapid firing
333:squeeze bore
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305:(no rifling)
280:flow forming
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244:scope mounts
241:
229:
209:
185:
169:
165:
144:
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126:
111:Rifle Scopes
73:Headquarters
418:(in German)
394:(in German)
284:gun barrels
172:Trave River
161:Third Reich
97:German Army
92:Area served
514:Categories
443:2022-01-14
368:References
303:Smoothbore
266:Innovation
256:flare guns
252:armourers
220:Gewehr 43
212:Gewehr 41
192:Wehrmacht
68:Dissolved
246:for the
103:Products
29:firearms
25:Industry
288:rifling
276:forging
149:Germany
107:weapons
84:Germany
55: (
50:Defunct
40: (
35:Founded
322:
320:
311:
309:
301:
299:
216:SVT-40
176:Lübeck
153:Lübeck
78:Lübeck
342:MG 42
248:Zf-41
232:G/K43
118:Owner
278:and
260:MG34
258:and
157:Nazi
65:Fate
57:1945
53:1945
42:1936
38:1936
516::
488:,
460:.
431:.
163:.
109:,
81:,
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446:.
59:)
44:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
